hoist equipment major classification and application areas

hoist equipment is a special lifting equipment, installed in the crane, on the gantry crane,Hoist equipment electric hoist with small size, light weight, simple operation, easy to use features for industrial and mining enterprises, storage terminals and other places.
hoist equipment major categories: electric chain hoist, wire rope electric hoist (proof gourd),hoist manufacturers corrosion electric hoist, double drum hoist, hoist, mini electric hoist, electric hoist crane group, multi-hoist.
Application areas: promotion, pull shift, handling heavy loads, tank flip chip bonding, such as installation and moving various medium-sized concrete, steel, and machinery and equipment for construction and installation companies, civil construction and bridge construction factories and mines, electric power, shipbuilding,Hoist and trolley automobile manufacturing, construction, roads, bridges, metallurgical, mining, slope tunnels, wells and other infrastructure construction management protection of machinery and equipment.

Electric wire rope hoists use precautions

An electric hoist by hand manipulation, the manipulator should fully grasp their security procedures.
2 electric hoist in use by plate lifting clamp someone to check , pay particular attention to the situation of wearing parts , found fault should be immediately cut off the main power supply , take timely measures , and carefully recorded .
When using electric hoist case 3 , the absolute prohibition is not allowed in the environment and exceed the rated load and nominal closing per hour ( 120 times ) for use under .
4 electric hoist use, must keep enough oil , and lubricants to ensure a clean and should not contain impurities and dirt.
5 When using electric hoist prohibited hoist and trolley by people , standing in lifting objects beneath strictly prohibited , prohibited under the swing state of lifting, hoisting and forbidden objects connected to the ground .

Introduction to the electric hoist gantry crane girder production technology (box)

With the continuous development of Hoist equipment economic development, the manufacturing level has been rapidly CDD Electric Chain Hoist. Electric hoist gantry crane is an indispensable equipment in building materials market, the manufacturing quality of high and low, directly affect its performance. Especially the metal structure manufacturing quality, plays an vital role in the safe use. Now to the rated lifting a total quality of 10 t electric hoist gantry crane as a case, introduced the production Hoist and trolley, hoping to play a good reference for similar projects. The related cheap wire rope hoist parameters are as follows: electric hoist gantry crane: rated lifting the quality of 10 t; Design chief, 36 m; Door leg span 24 m; Hoisting height 9 m; The beam width 6 m; Single girder structure, the door legs into the "eight" glyph stress; Wheel bearing, two-wheel driven. Whole girder body into the box structure is long and narrow shape, the girder web plate thickness is thinner, weld, and mainly concentrated in the top side, large amount of welding. Which is the most difficult to control point is: the main girder camber, web verticality, lateral bending, and 24 m span. Because the making craft of main girder has certain representativeness, door for other structures such as beam under rigid legs, manufacturing has important reference, in the only for the three of the crane structure of main girder of the production process, talk about manufacturing technology and quality control.

Imports of the unique advantages of chain hoists

Import chain hoists manufacturing technology, excellent function for the domestic market, one of the products imported high-grade  lever hoist  has a beautiful appearance, small size, the use of safe and reliable, excellent strength machine; transmission efficiency, hand simple, hand-zipper feel good, to reduce operator's labor intensity and strengths.



Primary mechanical hoists imported high quality steel manufacturing, in the design and use of the function has the following characteristics:
Import chain hoists safe and reliable, durable; American pioneer chain hoists good function, maintenance cumbersome; import chain hoists, small size, light weight, convenient to carry; import  manual hoist   hand-pull small, high efficiency; American pioneer hand pull hoist construction progress older, beautiful appearance; compact design, steel structure, wear resistance, corrosion resistance and high strength chain hooks fit European safety norms have a unique structure, fine about, appearance and other characteristics, rigid, high strength, compact structure, strengthen anti-collision abilities can usefully maintain internal parts.
Import chain hoists purposes:
Import chain hoist is a simple to use, convenient to carry the manual lifting, chain hoists together for workshops, mines, construction sites, agricultural consumption, and quays, shipyards and warehouses for equipment machinery, lifting, loading and unloading of goods vehicles , a special open and no power on homework,hoist and trolley more of its primary function.
Import chain hoists can be used with all kinds of manual TROLLEYS supporting the use constitutes manual lifting and transport trolley, together for overhead monorail transport, manual single girder overhead cranes and jib crane.

Mini electric wire rope hoist selection criteria

Mini electric rope hoist  rope is in one of the main components, the number of broken wire rope, erosion (wear) the amount of deformation, the use of such length and fixed state should meet the national standard.

(1) wire rope used should meet the requirements, the connection method should be correct.
a. rope ends fixed platen should be ≥ 2 or with a wedge fixed on the drum and other member.
b. When the hooks and other devices extract in the lowest position (including pit), the wire rope on the drum winding number, in addition to the fixed rope tail number of laps, but must leave ≥ 2 laps.
(2) one of the following occurs rope should be scrapped:
a. rope around the post in a twisting pitch (refers to any one of the rope around a week shares axial distance) number of broken wires within the total number of wire rope of 10%.
b. lifting hot metal or dangerous goods, rope, broken wires scrapped its general bouncer inflatable take half the heavy machine,hoist and trolley such as broken wires phenomenon concentrated in the local, or six times the length of broken wire rope diameter concentrated in a shares on a prescribed shall be half that line scrapped.
c. surface layer of steel wire rope corrosion or abrasion of the surface of the original wire diameter of 40%.
d. rope diameter is reduced amounted to 7%.
e. rope obvious internal corrosion.
f. rope surface wear or corrosion, there are a certain number of broken wires, broken wires tension meter from the surface to the requirements of a and b are multiplied by the reduction coefficient is determined after: when wear or corrosion rates were 10%, 15 %, 20%, 25%, 30% -40%
, The reduction factor corresponding to 85%, 75%, 70%, 60%, 50%.
g. entire strand break or burn out.
h. partial outer rope elongation was "cage"-shaped or rope fiber core diameter increases more serious.
i. rope kinking, dead, hard curved, plastic deformation,hoist equipment hemp core prolapse severely deformed.

Using miniature electric hoist should follow the following specification

In order to regulate electric  rope hoist  daily use and maintenance, to ensure the safe operation of electric hoist, stable, and must strictly enforce safety procedures relevant requirements.

One before using debug / checked
After a new installation or dismantling after the mini electric hoist, to be empty commissioning times. Not installed before the non-power operation.
2 installation or commissioning, check limit device is flexible and reliable, when hook up first limit position, the hook to the roll shell casings distance must be> 50mm lower limit position when the hook drops, should ensure that the roll wire rope safety circle, circle must be effective and safe in the more turns.
3 should be 125% of the rated load,hoist equipment lifting off the ground about 100mm, 10-minute static load test and check whether it is normal.
4 confirm the reliability of the brake status; adjust upper and lower limit stop module.
5 Check that the wedge is installed securely and reliably.
6 Check the wire rope is normal, if found bending, deformation, corrosion or wear serious, fracture extent exceeding the requirements, prohibited operation.
Two precautions in use
A miniature electric hoist shall hand manipulation, the manipulator should fully grasp their security procedures.
2 mini electric hoist in use by someone to check, paying particular attention wearing parts, and found fault,load chain immediately turn off the main power, to take timely measures.
3 is used, the absolute prohibition does not allow circumstances, and exceeds the rated load and nominal hourly closing times (120 times) of the cases.
4 in use, to maintain adequate oil and lubricating oil to ensure a clean and should not contain impurities and dirt.
5 prohibited by people standing on the lifting objects prohibited under strictly prohibited in the swing state of lifting, non-lifting of objects connected with the ground.
Three maintenance
A miniature electric hoist does not work, you can not put heavy objects hanging in the air, to prevent parts produce permanent deformation.
2 mini electric hoist maintenance work must be carried out in a no-load condition.
3 Adjust the amount of electric hoist brake down,hoist and trolley you should ensure that the rated load, brake down the amount S ≤ V/100.
4 rope oiling, you should use a stiff brush or small wooden pieces by hand directly to the non-working rope oiled.

Voltage transformer explosion-proof electric hoist introduction

1, tap: suitable for power system operation needs of the general high voltage side of the transformer has a tap, can not fully guarantee tap synchronous switching, so there can not load tap running in parallel.
2, explosion-proof electric  wire rope winch  voltage transformer: primary winding turns N1 ​​much less secondary winding turns N2, equivalent to a step-down transformer. PT at work at the primary and secondary windings are connected in parallel, respectively, in the primary circuit and the secondary voltage control loop coil. Therefore,hoist equipment if the secondary winding is short-circuited, will result in very large secondary current.
3, Used / drawer: Handcart and drawers are high voltage switchgear and low voltage switchgear part, were installed high voltage circuit breakers and low voltage circuit breakers and relays and other components. They fixed switch function is basically the same,hoist and trolley the main difference is to facilitate maintenance and repair of electric hoist.

Lifting belt maintenance home for

Lifting belt maintenance home for
1, should not be soft ring formed with any damage it may be possible to link up the installation.
2,rope hoist in the mobile lifting belt and cargo should not drag.
3, not so knotted.
4, the carrier should not make playing screwed.
5, should not be used without jacket lifting belt carrying a sharp corners,hoist and trolley edges of cargo.
6, should prevent soft ring opening angle beyond 20 °.
7, while the use of sling for a few,manual block should make the load evenly distributed.
8, lifting belt should be protected from light and no UV radiation under the conditions of storage.
9 should not be lifting with storage beside an open flame or other heat sources Sakon.
10, do not apply when the sling should be placed in a dedicated shelf.

Electric hoist startup procedure describes

Electric hoist startup process is measured from power,hoist and trolley the rotor speed is increased from zero to the rated value in the process, according to the characteristics of the DC electric hoist, it is commonly used in start-up mode with full pressure start, the string into the start-up and step-down start rheostat three.

Electric hoist hanging objects running in conditions permitting, the best hanging around 0.5m from the ground, by professionals in the electric hoist hanging objects help steady the object behind and around obstacles under the command runs. Do not run electric hoist intermittent,load chain long-distance running, it is best to send electricity long run as well. Electric hoist hanging objects should be to ensure the smooth running, electric hoist if hanging objects swing or jitter, should be running side edges steady running hook, not let it shake or swing.
When the armature windings of electric hoist power, its current rapid rise, resulting in startup counter, driven rotor and counter electromotive force generated, with the rise of the rotor speed,chain block back EMF increases, the armature current decreases, start switch cabinet down, the rotor speed increases slowly when starting electric hoist with load counters counters equal to regional stability, speed, start over.

Electric chain hoist After setting should also confirm what?

Electric chain hoist and not immediately after the installation started, the following points should be confirmed,manual hoist gourds before operation.
1, the power cable is fixed on the cable support.
2, the power supply voltage is the rated voltage of 5, connect the ground wire is being accurate.
3, chain electric hoist transport bolts, nuts, pins, etc.hoist and trolley without loss ashamed. Ensure fastening,manual block fully assembled.
4, key switch is being effectively used to protect rope installed to protect the rope pulling key switch is affected by force.
5, commissioning chain hoist must be strictly checked flexible limit device reliability.

Electric wire rope hoist five areas that need improvement

         The gap between domestic and foreign electric hoist quality in terms of technology or shrinking, many domestic electric chain hoist and manual hoist is gradually out of the country,hoist equipment the following summary of the current status of wire rope hoists the following five areas that need improvement.
1, supporting the motor
         CD1 type electric hoist supporting the conical rotor motor, single speed 4-pole, double-speed of 1/10 of the picture plane, and foreign wire rope hoist motor with 2 pole motor, two-speed dual windings and pole type, so simple structure, small size, light weight, help to reduce manufacturing costs. In addition, CD1 electric hoist matching motor in insulation class and degree of protection and noise as compared with foreign hoist the gap is still very large.
2, reducer security measures electrical control
         CD1 type electric hoist gear reducer manufacturing precision and low efficiency, noise, gear design parameters is not reasonable,hoist and trolley especially reflected in the carrying capacity and improve levels of gears and gear pairs equalization between the intensity.
3, security measures
        CD1 electric hoist only, the lower limit protection, overload protection. While foreign wire rope hoist addition to the protective function, but also has the wrong phase, phase, thermal protection, multi braking system protection.
4, the electrical control
         CD1 type electric hoist electric control box appearance, poor coordination, electrical component life low failure rate.
5, component design
         CD1 electric  rope hoist  hook, electric trolley system and other key components, a set of design and interchangeability is poor, and the structure is relatively bulky.

Electric hoist control failure, oil spills how do?

   Electric  wire rope hoist  lifting field is the most frequently used small lifting tool that uses various problems arising in the process greatly affect the efficiency, electric hoist for the process of using the following two situations encountered by customers following explanation, for your reference:
       1, the electric hoist can not stop or to the limit position remains Parking: most electric hoist can not stop the main contacts of the contactor is welded, when the  hoist and trolley  is stopped pressing the switch, the contacts of the contactor can not be disconnected, so that the motor as usual operation, the hoist does not stop. If the hoist to the limit stop position remains as stopper failure, this happens, immediately cut off the power, the electric hoist forcibly stop. After stopping, repair contactors or stopper, serious damage can not be repaired and must be replaced in order to work properly.
       2, electric hoist reducer oil spill reason: reducer joint screw not tightened, after the shutdown, you should tighten the screws. Gourd between gearcase and cover, seals defective assembly or failure damaged, repair or replace the seals should be removed, you can prevent the leakage problem.
       With the lifting industry continues to evolve, electric lift hoist  manufacturers after another, resulting in low quality gourd growing in recent years.

Overhaul of the basic requirements for construction machinery

  1. Overhaul of the technical evaluation before
      Currently, the project is to restore the machine some more performance overhaul repair of the machine after a longer period of time after the operation, the major components and assemblies of aging have reached the limit, it should all be the disintegration of the machine, cleaning, inspection and repair, achieve its performance standard at the factory.
Construction machinery overhaul is necessary before technical appraisal techniques used by the person in charge of the unit, management, maintenance and driving personnel to participate, the various components of the machine are not pre-dissolution pressure, flow, temperature and torque and other performance testing, and reviewed technical and operational records and other data files, a detailed assessment of the consumption of fuel and lubricants,hoist and trolley and make a detailed record. Then the original information provided by the manufacturer overhaul parameters be compared in order to determine whether repairs are needed.
Determine whether mechanical engineering major overhaul and technical conditions are:
⑴ engine performance indicators fell more than 20%; oil consumption exceeds the fixed value of one times; engine cylinder pressure when the temperature reaches above 45 ℃ when measured less than the required 60% of the index.
⑵ transmission main parts wear reaches the limit level, there is yaw, abnormal noise, shock and jitter phenomena.
⑶ steering worn gap is too large, manipulation failure; transmission gear and shaft wear serious, difficult or often jump shift gear; severely worn brake mechanism, braking performance degradation or failure and can not be adjusted.
      (2) repair method of choice
      Construction machinery into the plant overhaul,chain block the response to the disintegration of the parts are grouped, measurement, inspection and appraisal, and the assembly of the various components and the engine cylinder, crankshaft, etc. abrasion testing, in order to obtain a basis for whether to replace. Generally wear large moving parts need to be replaced; inconvenience for some replacement parts, should adopt welding, thermal spray, brush plating and chrome and other technology to restore its original design dimensions. Not guarantee the quality, the need to replace parts shall be in accordance with the requirements of the original manufacturer or designated collaborative purchase of spare parts manufacturers.
Repair method is divided into: repair and replacement assembly for motor repairs. The car repair method, that is, during the repair parts are sequentially removed from the machine, after washing, detection, classification, and repair or replacement, and finally reassembled in order to achieve the recovery performance of the repair methods. Law on car repair repair downtime longer occupied.
Replace assembly repair method, is in the repair process, in addition to the original rack renovations, the only remaining assembly is damaged or accessories all removed, replaced with pre-prepared (or repair) good assembly or accessories , and then assembled into machine repair methods. This method can significantly reduce downtime repair time, help to improve repairman efficiency, reduce costs and ensure the quality of maintenance. This is also the most popular American maintenance system maintenance methods, which increase the use of machinery and equipment intact rate units, utilization and production efficiency of great significance.
      3 Cautions
      ⑴ taken to exclude security risks. Overhaul process should be taken to exclude security risks, such as: adjusting brake clearance, replace worn clutch friction plate and the cab seat can be easily adjusted up or down, and the removal of some of the drivers and maintenance personnel likely to cause injury and machine failure security risks. Enhance driver awareness of labor protection, making the machine dangerous experiments, sufficient space should be left around and protective facilities (such as: electric  wire rope hoist  maximum load operation during the experiment wounding accident prone disintegration).
⑵ do overhauled tracking service. Build construction machinery overhaul maintenance files, and the unit should be repaired within a certain period after repair works to ensure mechanical energy to achieve the specified performance and good condition. During this period, such as general failure occurred, after adjustment to get rid of those who should be using the units themselves. Eg due to larger changes. Mechanical damage, severe oil spills, leaks, leakage and leakage and other major components must be disassembled for repair, the unit should be serviced by a joint notification repair unit inspection, timely repair to reduce downtime,manual hoist so after Overhaul the machine can be kept in good working condition.

Fracture Analysis sling occur

    Lifting sling is lifting, handling operations an important auxiliary tool, which includes wire slings, straps, hooks, steel clamp and so on. Sling with a wide variety of complex use of the environment, the use of large and uneven quality of personnel, risk factors,hoist and trolley and more, great harm. If used improperly or mismanagement, prone to accidents.
      For some companies in recent years fracture accident occurred in a sling, combined with years of safety management practice, sling rupture causes a careful analysis, and proposed preventive measures to ensure the safe use of a sling.
      1. Sling manufacturing irregularities
      Currently, companies use the sling into professional factory production and business homemade two parts. Sling professional manufacturer of the product quality, but off is the cause of the accident is an important reason. Some sling manufacturers do not follow the national standard production and testing products. Such as: 1999 factory bought 8 rated load 10 tons of Circular Welded chain, which has a sudden break in use. After examination, the chain breaks open welding seam obvious, belonging to neither certification nor the inspection mark and quality grade mark of the "three no" products.
      Some companies buy sling out, it is also full use of their existing equipment and human resources, their processing and the production of some number of single process is simple sling. Enterprise homemade sling, its randomness and blindness larger in the selection, to determine the size and production methods, often depending on their experience,chain block manufacturing quality and safety performance is difficult to achieve the requirements. Such as: a workshop in 2000 forged a two tons of small hooks, With no national standard DG series steel (using ordinary 45 # steel) manufacture, in use, the hook was straightened, hanging objects falling, almost led to casualties.
      2. Sling using the low quality of personnel security technology, poor safety awareness
Sling using technical quality and safety of personnel security awareness is not strong, not only affects the quality of the lifting operation, but also directly related to the user's personal safety. Its performance are the following, first, use of personnel safety consciousness. In the production process, some sling use of personnel emphasis on production safety, to grab the progress, time duration, simplify operating procedures, or even illegal dangerous operations and stuffed hair accidents. Second, some of the safety technology used low quality, they do not understand the basic performance sling and use requirements, but do not know how to calculate the center of gravity and determining hanging objects hanging method, so that in the specific operation, arbitrary, can lifting safety can not be guaranteed, then completely rely on hit "Grand Canal."
      3. Sling has not been included in the safety management of normal channels, extensive management
      Currently, sling safety management, the State has not developed a standardized management standards, companies are lack of appropriate safety management system, resulting in a sling safety management in a loose state. On the use of units (enterprises) in terms of a sling into use, by what sector management, long test time and by whom checks,lever hoist to what standard to be repaired or scrapped, which are impossible to implement. Resulting not timely detect and eliminate hidden dangers exist sling, sling so that part of the long-term "sick running" until an accident. Furthermore, the production plant or process is concerned, no one managed to implement fixed, fixed storage. Who is who take, littering after use, which makes the sling greatly increased chance of breakage.
      In addition, lifting the driver to improper operation, lifting up the stopper is caused sling failures and other fracture is an important reason.

Supervision of Special Equipment Inspection Inspection Program

Special equipment manufacturing supervision and inspection, including application, acceptance,rope hoist supervision, inspection, supervision and inspection certificate issued by procedures such as:
1 Applicants
For supervision and inspection of manufacturing units shall apply to the local Quality and Technical Supervision, together with a copy of the following materials:
(A) manufacturing license (copy or photocopy);
(2) The main products manufactured and production planning.
Installation and reconstruction of application maintenance supervision and inspection units fulfill the formalities, Quality and Technical Supervision belongs to the local special equipment inspection and testing institutions to apply,hoist and trolley along with a copy of the following materials:
(A) the construction of this book (photocopy);
(2) construction contracts;
(3) construction plans.
 
(2) accept
Local Quality and Technical Supervision, Inspection and manufacturing applications received, after examination that meet the requirements, be entertained and inform the respective institutional arrangements for inspection supervision and inspection work, and notify manufacturing units.
Installation and reconstruction of inspection and testing institutions received Supervision, Inspection and maintenance of the application, after examination that meets the requirements, it shall make arrangements for supervision and inspection work, and notify the Installation and reconstruction of maintenance units,
3 Inspection
Manufacturing Inspection:
Manufacturer shall supervision and inspection agencies at the scene to provide the following materials and conditions:
(1) production planning;
(2) Quality Management Manual and related management systems;
(3) the quality of management, professional and technical personnel and professional and technical workers certified personnel lists and documents;
(4) manufacturing equipment design documents, manufacturing process documents;
(5) The manufacturing process of the various inspection and acceptance information;
(6) the establishment of service with the supervision and inspection work;
(7) the necessary working conditions;
Inspection and testing institutions should be based on the output of manufacturing units,hoist equipment in line with the requirements of the inspection personnel engaged in the supervision and inspection work.
         
Installation transformation maintenance organization shall provide the following materials at the site and conditions:
(A) construction plans;
(2) Quality Management Manual and related management systems;
(3) the quality of management, professional and technical personnel and professional and technical workers certified personnel lists and documents;
(4) equipment factory file, install the transformation process and the corresponding maintenance of construction design documents;
(5) the construction process of a variety of inspection, acceptance information;
(6) the establishment of service with the work;
(7) under the supervision and inspection of the situation, you need to set up a fixed office space in the field, to prepare the necessary working conditions.
Inspection and testing institutions should be based on condition of the equipment, arrange to meet the requirements of the inspection personnel engaged in the supervision and inspection work.
4 Supervision and Inspection certificate issued
After inspection and testing institutions supervision and inspection, that the production process, equipment safety performance of technical safety requirements, according to Taiwan (cylinders by batch) issued by the special equipment safety supervision and inspection certificate (certificate, one copy); in the production process problems found, issued by the special equipment safety supervision and inspection contact list or advice notices.
Supervision, Inspection and specific provisions see Special Equipment Inspection rules of technical safety.

Supervision of Special Equipment Inspection

Inspection procedures and requirements
(A) Eligibility
Manufacture and installation of special equipment for transformation service (hereinafter referred to as production) process supervision and inspection shall meet the following basic requirements:
1 manufacturer shall obtain manufacturing,hoist and trolley installation, alteration, repair permits, within the validity period;
2 Install the transformation maintenance of construction has been informed in accordance with the provisions of the construction;
3 installed equipment manufacturing license is obtained product manufacturing units,wire rope winch and comply with the safety requirements of the technical specifications;
4 The transformation maintenance equipment has been handled using the registration;
5. Production quality management system is operating normally;
6 There is scope to adapt the production safety of technical specifications and standards;
Specific conditions and requirements contained in the relevant supervision and inspection rules of technical safety.
(Two) implementing agencies
AQSIQ approved quality and technology supervision departments at all levels of special equipment inspection and testing institutions. Manufacturing Inspection in accordance with the principle of territorial management, from the location of the test with a detection range of provincial and municipal agencies responsible for implementing the test detects the specific implementation by the Provincial Quality and Technical Supervision planning agency, to the public, written notice of manufacturing units.
Installation and reconstruction of maintenance supervision and inspection by the local inspection and testing with the scope of inspection and testing agencies, the specific scope of inspection and testing by the Provincial Quality and Technical Supervision arrangements to the public.
 
(Four) deadline
1 license authorities received the application and implementation of the information, shall,wire rope hoist within 5 working days to complete the work accepted, make arrangements for supervision and inspection of whether notice.
2. Supervision, Inspection and must meet the requirements of its production activities, supervision and inspection work is completed, general equipment shall, within 5 working days of inspection reports issued by oversight, large equipment shall be issued in 30 days supervision and inspection reports.

Heavy machinery enterprises should seize the advantage to enhance competitiveness

   Although China currently has a good number of heavy machinery companies, however, have the international competitiveness of the company does not have much. How to seize the opportunity for transformation of China's industrialization,hoist and trolley to create advantages, and then formed the core competitiveness, is placed in each of a Chinese heavy machinery industry entrepreneurs face the important issue.
Reform and opening up, China mainly university graduates represented a serious lack of intellectual talent, had not much technical content to labor-intensive industries to stimulate the economy to take off. With a low factor costs (including land, raw materials, energy, labor, etc.), the cost of environmental overdraft, creating a low-cost manufacturing advantage, the Chinese enterprises in the international conquering.wire rope winch Today, the low factor costs are long gone, people's awareness of environmental protection has become increasingly intense, low-cost manufacturing advantage can not be sustained. Meanwhile, China's personnel structure has undergone enormous changes in the number of university graduates hit record highs in 2008 reached 559 million, ranking first in the world, the employment pressure is very large, students also have a downward trend in wages; contrast, common workers because of labor-intensive industries and the relative lack of over-development in recent years, "labor shortage" is proof.
Face of the above economic background, Chinese heavy industry how the transfer of dominant elements gain new competitive advantage? We believe that Chinese companies are very heavy machinery necessary to fully utilize surplus and cheap Chinese college students the opportunity to research and development, services, marketing and other aspects of to build the core strengths achieved by the low-cost manufacturing to low-cost R & D and service transformation. Low-cost R & D and service opening times, marking the Chinese companies rely on technology, performance and service competition era.
    Heavy machinery industry is technology-intensive, labor-intensive and capital-intensive industry, compared with developed countries, China has the technical and financial advantages,manual hoist tend to have a strong competitive edge, however, compared with developed countries, China does not have the financial advantage, if only relying on manufacturing labor cost advantages, Chinese enterprises can only occupy the low-end market, it is difficult to win the competition, so technological innovation and related services for Chinese enterprises to go global key.
As long as Chinese enterprises to seize the opportunity to transfer Chinese elements advantages, make full use of the advantages of low-cost R & D and services, and increase efforts to develop technology, improve service levels, create a genuine core competitiveness,rope hoist the future can become internationally competitive heavy machinery enterprises.

Safe and correct operation of lifting tackle

Lifting tackle is an important tool for lifting his simple structure, easy to use, able to hoist and trolley  and block group number changes the direction of pulling and lifting or moving operation, especially by the coalition pulley pulley block with winches , mast or other lifting machines, widely used in the construction and installation operations.

Here are some safety when using tackle technical requirements:
(1), before use of new tackle from 1.25 times the rated load test.
(2) prior to use to identify pulley nominal weight, are not allowed from load can not be identified look-up table.
(3) Check tackle each part is intact, assembling any problems, defects, if any, is strictly prohibited.
(4), using a wire diameter must meet the requirements,hoist equipment rope and the pulley groove angle of not more than 40 to 60.
(5), large changes in the direction of the force of local and high-altitude operations, not to use the hook-type pulley, pulley-type rings should be chosen to prevent decoupling, as with a hook type, must be sealed with a lead wire.
(6), during use, coping pulleys, shafts regularly lubricating and reduce bearing wear.
(7), in the upper pulley disassembly is prohibited when thrown from a height,manual hoist to prevent injuries and damage to the pulley.
(8), the openings must first tackle the process of using active board properly to prevent rope pop wounding.

Using block and tackle and groups which inject public matters?

A pulley and pulley block used, they should pay attention to the following aspects:

     (A) from the weight of the  hoist equipment   generally marked on the nameplate in tackles jacket, non-overload. Pulley for lifting weight is unknown should not be used.
     (2) multi-block from the weight of the door, is worried by the door cars are fine, and if only one part of the pulley, lifting capacity corresponding decline proportionately. If 50t5 door pulley, when only three when lifting weight of 30t,
     (3) should always check the pulleys, hooks, rings of rotation is flexible, loose screws and pulley groove axis, plywood, clapboard and a hook and other parts for cracks or other damage, once problems are strictly prohibited .
     (4) wear around good rope pulley,lever hoist you should tighten the rope slowly afterburner trial hanging, hanging in the trial to check the work of tackles, with or without Kasheng, grinding rope, off the ropes and rope friction between places, found between title should be timely adjusted.
     (5) selection of tackle, to consider the pulley diameter, round bottom width, and the ratio between the rope diameter. General rope diameter pulley diameter should be 16 ^ -20 times the width should be larger than the bottom rope diameter 1-5mm,
     (6) large changes in force or high-altitude operations, should not be used hook block, pulley rings should be used to prevent accidents caused by decoupling.
     (7) when lifting heavy equipment,hoist and trolley should be preferred pair ran head along worn.
     (8) is lifting weights rose to the highest point, the total length of rope around the drum is less than the capacity of towing equipment. And given the distance between the pulley and the movable pulley should be more than safe distance while the rope rope groove angle is not greater than 40-60,
     (9) Put pulley to keep the clean,chain block lubricate moving parts regularly. After each operation, you should tackle cleaned, stored in dry warehouse shelves, to prevent corrosion.

Group hanging electric hoist operation guide

Group hanging electric hoist lifting when subjected to the following irresistible external influences, there will be loads shake situation. The group hanging electric hoist load sway people and things will be a series of bumps, the load falls and other accidents, and will affect the group hanging electric  chainb lock  trolley running.
Do not lifting loads near the end of the beam side of the state to run. Lifting loads shake or fall will encounter people and things, may result in death or serious injury. Load if shaking, shaking the more powerful, the more difficult the operation of the car, accompanied by danger. In principle, to make the load lateral shake. Therefore, please observe the following.
1, not stayed
2, you need to move laterally, try to slow down, the slow running;
3, do not dramatic lifting loads
4, Do not lifting loads at the side of the state near the end of the beam to run;
Factors because of inertia in starting and stopping traversing the  lever hoist   even if the strict compliance with the operation, the load will vary shaking, proposed as follows.


1: Press the lateral movement by one: key "figure a", run the car begins to move, the load will be slightly delayed "Figure b"
2: In the load before going to swing to a central location, close button once;
3: When the load back to group hanging just below the hoist when the button is pressed again, "drawing c", so that lateral movement in this state.
Starting and stopping group hanging electric hoist lateral movement, even to comply with the above operation,Hoist and trolley lifting loads but also how much will be shaking. At this point, if the following operations will be able to reduce the lifting load sway.