A chain hoist

Abstract

The present invention provides a chain-type hydraulic hoist. The chain-type hydraulic hoist includes a braking unit, a speed reduction unit, a lifting and traction unit, a hydraulic drive unit, and a hook assembly; the hydraulic drive unit transmits the rotation of its rotor shaft to the central gear shaft of the speed reduction unit, and after being decelerated and torque-increased by the speed reduction unit, it is transmitted to the driving sprocket of the lifting and traction unit. The lifting and traction unit is connected to the hook assembly through a hoist chain. The hoist chain makes a reciprocating motion driven by the driving sprocket; the hook assembly makes a reciprocating motion driven by the hoist chain; the braking unit is used to reduce or stop the rotation of the central gear shaft. The chain-type hydraulic hoist of the present invention generates a greater load through more planetary gears, uses antifriction pads to reduce the friction between the planetary gear set and the first-stage gear and the second-stage gear, reduces power loss, and thus can meet the requirements of low labor intensity and large load.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting equipment, and particularly relates to a chain type hydraulic hoist. Background Art

[0002] The lifting hoist is an important type of lifting equipment. The existing lifting hoists generally include manual hoists, electric hoists, pneumatic hoists, hydraulic hoists, etc.

[0003] However, the manual hoist is pulled by manpower, resulting in high manual labor intensity and low working efficiency; for the electric hoist, due to being driven by a motor, whether it is a brushed motor or a brushless motor, there may be electric sparks during the conductive transmission process. Therefore, explosion-proof measures must be taken when used in mines, resulting in a complex structure and a large volume; the pneumatic hoist cannot be used in mines due to limited gas source conditions, and its rated load is small; the traditional hydraulic hoist is driven by an emulsion motor, but usually has a small rated load. Due to their own limitations, these several types of hoists cannot be well matched with mining machinery and equipment. At present, the lifting equipment and small traction equipment used in mining machinery and equipment still mainly rely on manual hoists and wire rope winches with traditional structures. The winch realizes the traction and lifting functions by winding the wire rope on the drum. Due to the specific working environment in mines and underground, the wire rope is extremely prone to fuzzing and wire breakage, and is extremely likely to cause safety accidents. At the same time, due to the limitations of the lifting principle and structure, its overall size is relatively large, making it inconvenient to be placed on the supporting host machine. And the characteristics of the manual hoist cannot meet the requirements of efficient and fast operations. At the same time, none of the above-mentioned lifting equipment can meet the lifting requirements of the single rail hoist. Therefore, there is an urgent need for a single rail hoist suitable for use in coal mines and capable of solving the problems of load, volume, and weight requirements. Summary of the Invention

[0004] In view of the defects existing in the above-mentioned prior art, the object of the present invention is a chain type hydraulic hoist, and the obtained chain type hydraulic hoist can meet the requirements of low labor intensity and large load.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] The present invention provides a chain type hydraulic hoist, which includes a braking unit, a speed reduction unit, a lifting and traction unit, a hydraulic driving unit, and a hook assembly.

[0007] The arrangement positions of the above-mentioned braking unit, speed reduction unit, lifting and traction unit, hydraulic driving unit, and hook assembly can be adjusted according to the on-site working conditions. In this specification, the hydraulic driving unit, the lifting and traction unit, the speed reduction unit, and the braking unit are fixedly connected in sequence. The hook assembly is connected to the lifting and traction unit through a hoist chain.

[0008] The hydraulic drive unit transmits the rotation of the rotor shaft to the central gear shaft of the reduction unit. After being reduced in speed and increased in torque by the reduction unit, it is transmitted to the driving sprocket of the lifting traction unit. The lifting traction unit is connected to the hook assembly through a hoist chain. The hoist chain makes a reciprocating motion driven by the driving sprocket. The rotor shaft is the power output end of the hydraulic drive unit, and the power of the hydraulic drive unit is manifested as the rotational mechanical force of the rotor rotation.

[0009] The hook assembly makes a reciprocating motion driven by the hoist chain;

[0010] The braking unit reduces or stops the rotation of the central gear shaft.

[0011] Among them, the reduction unit includes:

[0012] The central gear shaft and at least 4 parallel gear shafts. Outer gears that mesh with each other are provided on the central gear shaft and the parallel gear shafts. The central gear shaft and the at least 4 parallel gear shafts form a planetary gear set, and the outer gears of the parallel gear shafts do not interfere with each other;

[0013] The second-stage gear ring and the first-stage gear ring; the inner sides of the first-stage gear ring and the second-stage gear ring are toothed, and the outer sides are in contact with and slide relative to the housing of the reduction unit; the first-stage gear ring and the second-stage gear ring are sleeved side by side around the parallel gear shafts and respectively mesh with the outer gears of the parallel gear shafts; the first-stage gear ring and the second-stage gear ring rotate around the central gear shaft;

[0014] The first-stage gear, which meshes with the first-stage gear ring and is fixedly connected to the housing of the reduction unit;

[0015] The second-stage gear, which meshes with the second-stage gear ring, does not interfere with the central gear shaft and rotates around the central gear shaft; the second-stage gear rotates in the housing of the reduction unit through a limiting mechanism, and the second-stage gear transmits the rotation to the driving sprocket of the lifting traction unit driven by the second-stage gear ring;

[0016] The central gear shaft penetrates through the first-stage gear and the second-stage gear, and the at least 4 parallel gear shafts are arranged between the first-stage gear and the second-stage gear.

[0017] Anti-friction pads are respectively arranged between the first-stage gear, the second-stage gear and the planetary gear set.

[0018] In the above chain-type hydraulic hoist, preferably, the outer gear of the parallel gear shaft is a double gear, and the tooth number ratios of meshing with the central gear shaft and the first- and second-stage gear rings are 24 / 21.

[0019] In the above-mentioned chain-type hydraulic hoist, preferably, the number of teeth of the central wheel shaft: the double gear of the parallel wheel shaft: the number of teeth of the first-stage gear ring: the number of teeth of the first-stage gear: the number of teeth of the second-stage gear ring: the number of teeth of the second-stage gear = 12:24 / 21:60:60:57:57. In the above-mentioned chain-type hydraulic hoist, the number of teeth can be finely adjusted up and down by a ratio of plus or minus 10%, but the gear ratio and gear design principle need to be satisfied. In the above-mentioned chain-type hydraulic hoist, a relatively large tooth ratio is used, which can better reduce the speed and increase the torque.

[0020] In the above-mentioned chain-type hydraulic hoist, preferably, the at least 4 parallel wheel shafts and the central wheel shaft form a planetary gear set through a planet carrier.

[0021] In the above-mentioned chain-type hydraulic hoist, preferably, the material of the antifriction pad is a polyether material.

[0022] In the above-mentioned chain-type hydraulic hoist, preferably, the reduction unit further includes a sealing seat, and the second-stage gear and the housing of the reduction unit are hermetically connected through the sealing seat.

[0023] In the above-mentioned chain-type hydraulic hoist, preferably, the reduction unit further includes a small sealing seat, the central wheel shaft penetrates through the housing of the reduction unit, and the two are hermetically connected through the small sealing seat.

[0024] In the above-mentioned chain-type hydraulic hoist, preferably, the lifting and traction unit includes:

[0025] A coupling with a motor spline coupling sleeve at one end, the other end of the coupling is fixedly connected to the central wheel shaft, and the motor spline coupling sleeve is connected to the rotor shaft of the hydraulic drive unit;

[0026] A driving sprocket and a driven sprocket sleeved side by side on the coupling and relatively rotating with the coupling, the driving sprocket is fixedly connected to the second-stage gear;

[0027] A driving sprocket housing sleeved outside the driving sprocket, and the driving sprocket is movably connected to the driving sprocket housing through a ball bearing and / or a roller bearing;

[0028] A driven sprocket housing sleeved outside the driven sprocket and fixedly connected or integrally designed with the housing of the driving sprocket, and the driven sprocket is movably connected to the driven sprocket housing through a ball bearing and / or a roller bearing;

[0029] The ball bearings or roller bearings adjacent to each other between the driving sprocket and the driven sprocket are separated by a bearing spacer sleeve;

[0030] The main chain splitter is arranged at the lower part of the driving sprocket housing, and the hoist chain is connected to the driving sprocket through the main chain splitter;

[0031] The slave chain splitter is arranged at the lower part of the driven sprocket housing, and the hoist chain is connected to the driven sprocket through the slave chain splitter.

[0032] In the above chain type hydraulic hoist, preferably, the chain type hydraulic hoist further includes a protective cover, and the protective cover is sleeved outside the hydraulic drive unit.

[0033] In the above chain type hydraulic hoist, preferably, the chain type hydraulic hoist further includes a chain stopper, and the chain stopper is fixedly connected to the hoist chain and then fixedly arranged outside the chain type hydraulic hoist.

[0034] The prominent effect of the present invention is:

[0035] The chain type hydraulic hoist of the present invention generates a greater load through more planetary gears, uses antifriction pads to reduce the friction between the planetary gear set and the first-stage gear and the second-stage gear, reduces power loss, and thus can meet the requirements of low labor intensity and large load.

[0036] Furthermore, the present invention uses a larger gear ratio to generate a greater load, and more uses the main and slave chain splitters to make the hoist chain slide smoothly and reduce resistance. The multi-angle cooperation makes the chain type hydraulic hoist have a stronger load improvement effect. Brief Description of the Drawings

[0037] Figure 1a is a side view of the chain type hydraulic hoist of the present invention;

[0038] Figure 1b is a structural schematic diagram of the chain type hydraulic hoist of the present invention;

[0039] Figure 2 is a structural schematic diagram of the reduction unit in the chain type hydraulic hoist of the present invention;

[0040] Figure 3 is a structural schematic diagram of the lifting and traction unit in the chain type hydraulic hoist of the present invention. Detailed Description of the Invention

[0041] In order to have a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solutions of the invention are described in detail below, but it should not be construed as a limitation on the implementable scope of the invention.

[0042] Figures 1-3 are diagrams of an embodiment of the present invention.

[0043] A specific embodiment of the present invention: Provide a chain type hydraulic hoist, as Figure 1a and Figure 1bAs shown, the chain hydraulic hoist includes a brake unit 1, a deceleration unit 2, a lifting and traction unit 3, a hydraulic drive unit 4 and a hook assembly 6; the hydraulic drive unit 4, the lifting and traction unit 3, the deceleration unit 2 and the brake unit 1 are fixedly connected in sequence. The hook assembly 6 is connected to the lifting and traction unit through a hoist chain.

[0044] The hydraulic drive unit 4 transmits the rotation of the rotor shaft (the rotating shaft of the hydraulic drive unit power output) to the central wheel shaft 201 of the reduction unit 2, and after the reduction unit reduces speed and increases torque, it is transmitted to the driving sprocket 37 of the lifting and traction unit 3. The lifting and traction unit 3 is connected to the hook assembly 6 through a hoist chain, and the hoist chain reciprocates under the drive of the driving sprocket 37. The hook assembly reciprocates under the drive of the hoist chain.

[0045] The brake unit 1 is used to reduce or stop the rotation of the central wheel shaft;

[0046] In this embodiment, the hydraulic drive unit 4 is powered by hydraulic drive, thereby driving the rotor shaft to rotate as power output. The brake unit 1 is a brake, which can be a common brake available on the market, mainly providing braking force, especially a parking mechanical brake in a lifting state, providing stable and safe braking force when keeping the lifted object at a certain height above the ground.

[0047] The hook assembly 6 is a conventional pulley block hook design to achieve the sharing of multiple forces. The hook assembly includes a hook wheel and a hook. The hook is connected to the hook wheel. The hook wheel is a fixed end of the hoist chain, and the other end is connected to the chain stopper. The hoist chain passes around the driven sprocket 36 from the fixed force point of the hook wheel and then passes back around the pulley of the hook wheel and bypasses the active sprocket to achieve a pulley group with 3 times the force.

[0048] Among them, Figure 2 As shown, the reduction unit 2 includes:

[0049] The central wheel shaft 201 and the four parallel wheel shafts 206 are matched with mutually meshing external gears, and the external gears of the parallel wheel shafts 206 do not interfere with each other. The central wheel shaft 201 and the four parallel wheel shafts 206 form a planetary gear set;

[0050] In this specific implementation, four parallel axles 206 are selected to form a planetary gear set, which is more evenly stressed, generates greater torque, and has less mutual interference. In other specific implementations, five, six, or even more parallel axles can be considered to form a planetary gear set, which is a similar replacement of this solution.

[0051] The secondary gear ring 205 and the primary gear ring 207; the inner sides of the primary gear ring 207 and the secondary gear ring 205 are toothed, and the outer sides are in contact with and slide relative to the housing 203 of the reduction unit; the primary gear ring 207 and the secondary gear ring 205 rotate around the central wheel shaft 201; the primary gear ring 207 and the secondary gear ring 205 are sleeved side by side around the periphery of the parallel wheel shafts 206 and are respectively meshed with the external gears of the 4 parallel wheel shafts 206; the secondary gear ring 205 rotates driven by the parallel wheel shafts 206, and the torque transmission generated by the parallel wheel shafts 206 and the reverse torque generated after acting on the primary gear 208 act on the secondary gear ring 207 to form torque output.

[0052] In this specific embodiment, the housing of the reduction unit is a carrier for fixing all components of the reduction unit, and all components are an integral whole with a tight combination. Engine oil or lubricating oil can be added inside and sealed by a sealing seat. The central wheel shaft 201 penetrates through the housing 203 of the reduction unit, and the central wheel shaft 201 and the housing 203 of the reduction unit are sealed through a small sealing seat 210. The connection part between the central wheel shaft 201 and the housing 203 of the reduction unit is a bearing 211. If there is no lubricating oil, it can also not be sealed.

[0053] The primary gear 208, which is meshed with the primary gear ring 207 and rotates around the central wheel shaft; the primary gear 208 is fixedly connected to the housing 203 of the reduction unit; the primary gear can be large or small, as long as it can lock the primary gear ring, and its fixed position and the integrity of the gear can be adjusted. In this specific embodiment, the relative position between the primary gear 208 and the housing 203 of the reduction unit is also adjusted and fixed through a positioning pin 212.

[0054] The secondary gear 204, which is meshed with the secondary gear ring 205 and rotates around the central wheel shaft 201; the secondary gear 204 does not interfere with the central wheel shaft 201; the secondary gear 204 rotates in the housing 203 of the reduction unit through a limiting mechanism, and the secondary gear 205 drives the secondary gear 204 to transmit the rotation to the driving sprocket 302 of the lifting traction unit.

[0055] The central wheel shaft 201 penetrates through the primary gear 208 and the secondary gear 204, and the 4 parallel wheel shafts 206 are arranged between the primary gear 208 and the secondary gear 204;

[0056] The antifriction pads 209 are respectively arranged between the primary gear 208, the secondary gear 204 and the planetary gear set 206. The material of the antifriction pads is a polyether material, which can be PEEK material, and is the key to eliminating mechanical friction resistance; selecting high-quality PEEK material greatly reduces the wear between components, and the extremely small friction coefficient can greatly improve the efficiency in transmission.

[0057] In this specific embodiment, the four parallel axle shafts 206 can be floatingly arranged in the enclosed space formed by the first-stage gear 208, the second-stage gear 204, the first-stage gear ring 207, and the second-stage gear ring 205. After adjusting the positions, they can achieve planetary rotation without interfering with each other. This state, combined with the use of the antifriction pads 209, reduces the use of the planet carrier, resulting in less friction, less power loss, and greater load capacity.

[0058] In a further embodiment, the four parallel axle shafts 206 and the central axle shaft 201 form a planetary gear set through the planet carrier. This structure makes the rotation of the four parallel axle shafts more stable and reduces vibration.

[0059] In this specific embodiment, one end of the central axle shaft 201 is fixed by the housing 203 of the reduction unit, and the other end is connected to the coupling of the lifting and traction unit 3 without being fixed to the housing 203 of the reduction unit, which is a semi-floating connection. At the same time, the parallel axle shafts 201, the first-stage gear ring 207, the second-stage gear ring 205, and the second-stage gear 204 are all in a floating state, capable of forming a self-correcting mechanical transmission structure, avoiding problems such as mechanical jamming and low efficiency.

[0060] In this specific embodiment, the external gear of the parallel axle shaft is a double gear, and the tooth number ratios of meshing with the central axle shaft and the first- and second-stage gear rings are 24 / 21 respectively; the tooth number of the central axle shaft: 12, the tooth number of the parallel axle shaft: double gear 24 / 21, the tooth number of the first-stage gear ring: 60, the tooth number of the first-stage gear: 60, the tooth number of the second-stage gear ring: 57, and the tooth number of the second-stage gear: 57. The above gear set uses a relatively large tooth number ratio, which can effectively reduce speed and increase torque, and increase the load.

[0061] In a further embodiment, the reduction unit further includes a seal seat 202, and the second-stage gear 204 and the housing 203 of the reduction unit are hermetically connected through the seal seat. The housing of the reduction unit is the carrier for fixing all components of the reduction unit, and all components are closely integrated as a whole. Engine oil or lubricating oil can be added inside and sealed by the seal seat. If no lubricating oil is added, it can also not be sealed.

[0062] In this embodiment, on the housing 203 of the reduction unit, a vent hole 213 is provided at the position corresponding to the second-stage gear ring 205. The air pressure in the above-mentioned enclosed space can be released through the vent hole, and lubricating oil can also be poured in and closed by the screw plug 214.

[0063] In this specific embodiment, as Figure 1b and Figure 3 shown, the lifting and traction unit 3 includes:

[0064] A coupling shaft with a motor spline coupling sleeve 310 at one end, the other end of the coupling shaft is fixedly connected to the central wheel shaft 201, and the motor spline coupling sleeve 310 is connected to the rotor shaft of the hydraulic drive unit;

[0065] A driving sprocket 32 ​​and a driven sprocket 37 are arranged in parallel on the coupling shaft and rotate relative to the coupling shaft, and the driving sprocket 32 ​​is fixedly connected to the secondary gear 24;

[0066] A driving sprocket housing 31, wherein the driving sprocket housing 31 is sleeved on the outside of the driving sprocket 32, and the driving sprocket 32 ​​is movably connected to the driving sprocket housing 31 through a ball bearing 38 and a roller bearing 33;

[0067] The driven sprocket housing 36 is sleeved on the outside of the driven sprocket 37 and is fixedly connected to the housing 31 of the driving sprocket through flanges 39 at both ends. The driven sprocket 37 is movably connected to the driven sprocket housing through ball bearings 38 and roller bearings 33. In this embodiment, roller bearings are used between the master and driven sprockets, and ball bearings are used at both ends, which can make the operation of the master and driven sprockets more stable, and the roller bearings can withstand greater forces.

[0068] The roller bearings 38 adjacent to the driving sprocket 32 ​​and the driven sprocket 37 are separated by a bearing isolation sleeve 34; in a further embodiment, the master and driven sprockets and the master and driven sprocket housings are isolated by an intermediate partition 35, which can further prevent mutual interference between the two roller bearings 38.

[0069] A main chain splitter 311 is disposed at the lower part of the driving sprocket housing 31, and the hoist chain is connected to the driving sprocket 32 ​​through the main chain splitter 311;

[0070] The slave chain splitter 312 is arranged at the lower part of the driven sprocket housing 36, and the hoist chain is connected to the driven sprocket 37 through the slave chain splitter 312. The master and slave chain splitters are conventional commercial products.

[0071] In this specific implementation, the chain hydraulic hoist further includes a protective cover 5 , which is sleeved on the outside of the hydraulic drive unit 4 to protect the hydraulic drive unit 4 .

[0072] In this specific implementation mode, Figure 1a As shown, the chain hydraulic hoist further comprises a chain stopper 7, which is fixedly connected to a hoist chain 8 and then fixedly arranged outside the chain hydraulic hoist.

[0073] In this specific embodiment, the gourd chain is a high-strength hoisting gourd chain. The selected specification of the 16X48 hoisting gourd chain is a high-strength national standard hoisting chain with a rated single-load capacity of 8T and a breaking force of 200kN. The maximum load capacity designed in the hydraulic winch is 6T, and the safety factor is reasonable. The hoisting chain has the performance characteristics of plastic deformation, avoiding the danger caused by sudden overload fracture. The flanges are connected together with M20 high-strength long screws. The flange holes on both sides of the flange can be used to install the hydraulic drive unit and the reduction unit. The lifting and traction unit 3 forms a gear train with a 3-fold magnification composed of a driving wheel, a driven wheel, and a hook assembly. The basic functions of the structure of the chain-type hydraulic hoist are realized, and the hoisting and lowering of heavy objects can be completed in combination with the high-strength hoisting chain and the hook assembly.

[0074] The 18T chain-type hydraulic hoist of the mine support carrier vehicle of the present invention is driven and controlled by hydraulic transmission. The hydraulic drive and control components adopted in the structure are suitable for special operating conditions, enabling the hydraulic hoist to achieve stepless speed change and convenient control. The large-speed-ratio planetary reduction mechanism can increase the hoisting power, achieving the structural characteristics of small volume and large load capacity of the device. The use of high-strength hoisting chains can avoid the defects of wire ropes in use.

[0075] The hydraulic motor driven and controlled by hydraulic pressure adopts a cycloidal hydraulic motor. Under the condition that the driving power is satisfied, its compact structure and small volume can make the overall size of the hydraulic hoist smaller and the cost lower. The integrated hydraulic control valve group also achieves the purpose of small volume, light weight, simple and convenient adjustment. The integrated hydraulic control valve group and the hydraulic motor are organically integrated together, making the hydraulic control reasonable and practical, avoiding pipeline leakage points, and saving installation space.

[0076] The connection method between the lifting and traction direct drive device and the planetary reducer adopts a driving sprocket housing, a driving sprocket, a planetary reducer seal seat, a bearing spacer, an intermediate partition, a driven sprocket housing, a driven sprocket, and a flange. The components are supported and positioned together by the high-precision dimensions of the inner hole and outer circle of the bearing, reducing the positioning surfaces of each component and simplifying and practicalizing the structure.

[0077] The large-speed-ratio planetary reducer improves the hoisting capacity of the hoist. Under the premise that the rated load of the hydraulic hoist increases several times, its volume will not increase much, laying a foundation for the expansion of the hoist performance. The selected steel materials meet the requirements for use under mine underground operating conditions, have no explosion-proof safety hazards, and are suitable for use in coal mines underground.

[0078] As can be seen from the above, the above-mentioned chain-type hydraulic hoist of the present invention combines hydraulic drive with a lifting chain, making the hydraulic hoist small in size and large in load capacity, facilitating installation and commissioning, and being conducive to the selection and use by the main engine factory. The stepless speed change characteristic of the hydraulic drive and the function of the hydraulic motor being convenient for forward and reverse make this hydraulic hoist easy to operate and control. The reasonable application of the hydraulic safety valve, balance valve and hydraulic brake, as well as the lifting method in the form of a lifting chain not only avoids the defects in the use of steel wire ropes, but also enables the hydraulic hoist to be safe and reliable throughout the working process. Its structural characteristics also facilitate the use in mines and underground.

Claims

1. A chain hoist, characterized in that: The chain type hydraulic hoist includes a braking unit, a speed reduction unit, a lifting and traction unit, a hydraulic drive unit and a hook assembly; The hydraulic drive unit transmits power from the rotation of its rotor shaft to the central gear shaft of the speed reduction unit. After being speeded up and torque increased by the speed reduction unit, it is transmitted to the driving sprocket of the lifting and traction unit. The lifting and traction unit is connected to the hook assembly through a hoist chain. The hoist chain makes a reciprocating motion driven by the driving sprocket; The hook assembly makes a reciprocating motion driven by the hoist chain; The braking unit is used to reduce or stop the rotation of the central gear shaft; Wherein, the speed reduction unit includes: A central gear shaft and at least 4 parallel gear shafts. Outer gears that mesh with each other are arranged on the central gear shaft and the parallel gear shafts. The central gear shaft and the at least 4 parallel gear shafts form a planetary gear set, and the outer gears of the parallel gear shafts do not interfere with each other; A second-stage gear ring and a first-stage gear ring; the inner sides of the first-stage gear ring and the second-stage gear ring are toothed, and the outer sides are in contact with and slide relative to the housing of the speed reduction unit; the first-stage gear ring and the second-stage gear ring are sleeved side by side around the parallel gear shafts and respectively mesh with the outer gears of the parallel gear shafts; the first-stage gear ring and the second-stage gear ring rotate around the central gear shaft; A first-stage gear that meshes with the first-stage gear ring, and the first-stage gear is fixedly connected to the housing of the speed reduction unit; A second-stage gear that meshes with the second-stage gear ring. The second-stage gear does not interfere with the central gear shaft and rotates around the central gear shaft; the second-stage gear rotates in the housing of the speed reduction unit through a limiting mechanism, and the second-stage gear transmits rotation to the driving sprocket of the lifting and traction unit driven by the second-stage gear ring; The central gear shaft penetrates through the first-stage gear and the second-stage gear, and the at least 4 parallel gear shafts are arranged between the first-stage gear and the second-stage gear; Anti-friction pads are respectively arranged between the first-stage gear, the second-stage gear and the planetary gear set; The lifting and traction unit includes: A coupling with a motor spline coupling sleeve at one end. The other end of the coupling is fixedly connected to the central gear shaft, and the motor spline coupling sleeve is connected to the rotor shaft of the hydraulic drive unit; A driving sprocket and a driven sprocket sleeved side by side on the coupling and rotating relative to the coupling. The driving sprocket is fixedly connected to the second-stage gear; A driving sprocket housing that is sleeved outside the driving sprocket. The driving sprocket is movably connected to the driving sprocket housing through a ball bearing and / or a roller bearing; A driven sprocket housing that is sleeved outside the driven sprocket and is fixedly connected to or integrally designed with the housing of the driving sprocket. The driven sprocket is movably connected to the driven sprocket housing through a ball bearing and / or a roller bearing; The ball bearings or roller bearings adjacent to each other between the driving sprocket and the driven sprocket are separated by a bearing spacer sleeve; A main chain splitter is arranged at the lower part of the driving sprocket housing. The hoist chain is connected to the driving sprocket through the main chain splitter; A slave chain splitter is arranged at the lower part of the driven sprocket housing. The hoist chain is connected to the driven sprocket through the slave chain splitter; The anti-friction pad is made of a polyether material.

2. The chain hoist according to claim 1, characterized in that: The external gear of the parallel axle is a double gear, and the tooth number ratios of meshing with the central axle and the first and second stage gear rings are 24 / 21 respectively.

3. The chain type hydraulic hoist according to claim 2, characterized in that: The tooth number of the central axle: the double gear of the parallel axle: the tooth number of the first stage gear ring: the tooth number of the first stage gear: the tooth number of the second stage gear ring: the tooth number of the second stage gear = 12: 24 / 21: 60: 60: 57:

57.

4. The chain hoist according to claim 1, characterized in that: The at least 4 parallel axles and the central axle form a planetary gear set through a planet carrier.

5. The chain type hydraulic hoist according to claim 1, characterized in that: The reduction unit further includes a sealing seat, and the second stage gear and the housing of the reduction unit are hermetically connected through the sealing seat.

6. The chain hoist according to claim 1, wherein: The reduction unit further includes a small sealing seat, the central axle penetrates through the housing of the reduction unit, and the two are hermetically connected through the small sealing seat.

7. The chain type hydraulic hoist according to claim 1, wherein: This chain type hydraulic hoist further includes a protective cover, and the protective cover is sleeved outside the hydraulic drive unit.

8. The chain type hydraulic hoist according to claim 1, characterized in that: This chain type hydraulic hoist further includes a chain stopper, and the chain stopper is fixedly connected with the hoist chain and fixedly arranged outside the chain type hydraulic hoist.

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