CN113428795A

CN113428795A - Chain hydraulic hoist

Info

Publication number: CN113428795A
Application number: CN202110833131.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: BEIJING JINXUANYE TECHNOLOGY CO LTD
Current assignee: BEIJING JINXUANYE TECHNOLOGY CO LTD
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2021-09-24

Abstract

The invention provides a chain type hydraulic hoist. The chain type hydraulic hoist comprises a braking unit, a speed reducing unit, a hoisting and traction unit, a hydraulic driving unit and a lifting hook assembly; the hydraulic driving unit transmits the rotation of a rotor shaft of the hydraulic driving unit to a central wheel shaft of the speed reducing unit, the rotation is transmitted to a driving chain wheel of the hoisting and traction unit after being reduced and twisted by the speed reducing unit, the hoisting and traction unit is connected with the lifting hook assembly through a hoist chain, and the hoist chain reciprocates under the driving of the driving chain wheel; the lifting hook assembly is driven by the hoist chain to do reciprocating motion; the brake unit serves to reduce or stop the rotation of the center hub. The chain type hydraulic hoist generates larger load through more planetary gears, reduces the friction between the planetary gear set and the primary gear and the secondary gear by using the friction reducing pad, and reduces power loss, thereby meeting the requirements of low labor intensity and large load.

Description

Chain hydraulic hoist

Technical Field

The invention belongs to the technical field of hoisting equipment, and particularly relates to a chain type hydraulic hoist.

Background

The hoisting block is an important kind of hoisting equipment, and the existing hoisting blocks generally comprise a chain block, an electric block, a pneumatic block, a hydraulic block and the like.

However, the chain block is pulled by manpower, the labor intensity of the manpower is high, and the work efficiency is low; the electric hoist is driven by the motor, and whether the electric hoist is driven by a brush motor or a brushless motor, electric sparks possibly exist in the conductive transmission process, so that explosion-proof measures are required to be taken when the electric hoist is used under a mine, and the electric hoist is complex in structure and large in size; the pneumatic hoist cannot be used under a mine due to the limitation of air source conditions, and the rated load of the pneumatic hoist is small; the conventional hydraulic block is driven by an emulsion motor, but the rated load is usually small. The calabash cannot be well matched with mining machinery due to the limitation of self conditions. At present, hoisting equipment and small-sized traction equipment used by mining machinery equipment mainly adopt chain blocks and wire rope winches with traditional structures. The winch realizes the traction and hoisting functions by winding the steel wire rope on the roller, and the steel wire rope is easy to fuzz and break to damage and to cause safety accidents due to the specific working environment of mines and underground. Meanwhile, the whole size is larger due to the limitation of a hoisting principle and a structure, so that the lifting device is inconvenient to place on a matched host. The characteristics of the chain block can not meet the aim of high-efficiency and quick operation. Meanwhile, the hoisting equipment cannot meet the hoisting requirement required by the monorail crane. Therefore, a monorail crane which is suitable for underground coal mines and can solve the problems of load, volume and weight requirements is urgently needed.

Disclosure of Invention

In view of the defects in the prior art, the invention aims to provide a chain type hydraulic hoist which can meet the requirements of low labor intensity and large load.

The purpose of the invention is realized by the following technical scheme:

the invention provides a chain type hydraulic hoist which comprises a braking unit, a speed reducing unit, a hoisting traction unit, a hydraulic driving unit and a lifting hook assembly.

The distribution positions of the braking unit, the speed reducing unit, the hoisting and traction unit, the hydraulic driving unit and the lifting hook assembly can be adjusted according to the working conditions of the site. In the present description, the hydraulic drive unit, the hoisting and towing unit, the speed reduction unit, and the brake unit are fixedly connected in sequence. The lifting hook assembly is connected to the hoisting and traction unit through a hoist chain.

The hydraulic driving unit transmits the rotation of the rotor shaft to a central wheel shaft of the speed reducing unit, the rotation is transmitted to a driving chain wheel of the hoisting and traction unit after being reduced and twisted by the speed reducing unit, the hoisting and traction unit is connected with the lifting hook assembly through a hoist chain, and the hoist chain is driven by the driving chain wheel to reciprocate. The rotor shaft is a power output end of the hydraulic driving unit, and the power of the hydraulic driving unit takes the rotating mechanical force of the rotation of the rotor as an expression form.

The lifting hook assembly is driven by the hoist chain to do reciprocating motion;

the brake unit reduces or stops the rotation of the center wheel shaft.

Wherein the speed reduction unit includes:

the planetary gear set comprises a central wheel shaft and at least 4 parallel wheel shafts, wherein the central wheel shaft and the parallel wheel shafts are provided with external gears which are meshed with each other in a matched mode, the central wheel shaft and the at least 4 parallel wheel shafts form a planetary gear set, and the external gears of the parallel wheel shafts are not interfered with each other;

a secondary gear ring and a primary gear ring; the inner side surfaces of the primary gear ring and the secondary gear ring are teeth, and the outer side surfaces are attached to the shell of the speed reducing unit and slide relatively; the primary gear ring and the secondary gear ring are sleeved on the periphery of the parallel wheel shaft in parallel and are respectively meshed with the outer gears of the parallel wheel shaft; the primary gear ring and the secondary gear ring rotate by taking the central wheel shaft as a center;

the primary gear is meshed with the primary gear ring and is fixedly connected with the shell of the speed reducing unit;

the secondary gear is meshed with the secondary gear ring, does not interfere with the central wheel shaft, and rotates by taking the central wheel shaft as a center; the secondary gear rotates in the shell of the speed reducing unit through a limiting mechanism, and the secondary gear is driven by the secondary gear ring to transmit the rotation to a driving sprocket of the hoisting and traction unit;

the central wheel shaft penetrates through the primary gear and the secondary gear, and the at least 4 parallel wheel shafts are arranged between the primary gear and the secondary gear.

And the friction reducing pads are respectively arranged among the primary gear, the secondary gear and the planetary gear set.

In the chain type hydraulic hoist, preferably, the external gear of the parallel wheel shaft is a duplicate gear, and the gear ratio of the external gear to the central wheel shaft and the second-level gear ring is 24/21.

In the chain hydraulic hoist, preferably, the number of teeth of the center wheel shaft, the number of teeth of the parallel wheel shaft, the duplex gear, the primary gear ring, the secondary gear ring, the center wheel shaft, the duplex gear, the secondary gear ring, the center wheel shaft, the duplex gear, the primary gear ring, the secondary gear ring, the duplex gear, the secondary gear ring, the center wheel shaft, the duplex gear, the secondary gear ring, the center wheel shaft, the duplex gear, the parallel wheel shaft, the primary gear ring, the secondary gear ring, the duplex gear ring, the secondary gear ring, the sprocket, and the sprocket, and the sprocket are preferably. In the chain type hydraulic hoist, the number of teeth can be finely adjusted up and down according to the proportion of plus or minus 10%, but the gear ratio and the gear design principle need to be met. In the chain type hydraulic hoist, a larger gear ratio is used, so that the speed can be reduced better, and the torque can be improved better.

In the 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.

In the chain hydraulic hoist, the friction reducing pad is preferably made of a polyether material.

In the above chain type hydraulic hoist, preferably, the speed reduction unit further includes a sealing seat, and the secondary gear is hermetically connected to the housing of the speed reduction unit through the sealing seat.

In the chain hydraulic hoist, preferably, the speed reduction unit further includes a small sealing seat, and the central wheel shaft penetrates through a housing of the speed reduction unit and is hermetically connected with the housing through the small sealing seat.

In the chain hydraulic hoist, preferably, the hoisting and pulling unit includes:

the motor spline coupling shaft is connected with a rotor shaft of the hydraulic driving unit;

the driving chain wheel and the driven chain wheel are sleeved on the coupling shaft in parallel and rotate relative to the coupling shaft, and the driving chain wheel is fixedly connected with the secondary gear;

the driving chain wheel shell is sleeved outside the driving chain wheel, and the driving chain wheel is movably connected with the driving chain wheel shell through a ball bearing and/or a roller bearing;

the driven chain wheel shell is sleeved outside the driven chain wheel and is fixedly connected with the shell of the driving chain wheel or is integrally designed, and the driven chain wheel is movably connected with the driven chain wheel shell through a ball bearing and/or a roller bearing;

the ball bearings or roller bearings adjacent to the driving chain wheel and the driven chain wheel are separated by a bearing isolation sleeve;

the main chain divider is arranged at the lower part of the driving chain wheel shell, and the hoist chain is connected to the driving chain wheel through the main chain divider;

and the driven chain splitter is arranged at the lower part of the driven chain wheel shell, and the hoist chain is connected to the driven chain wheel through the driven chain splitter.

In the chain hydraulic hoist, preferably, the chain hydraulic hoist further includes a protective cover, and the protective cover is sleeved outside the hydraulic drive unit.

In the above chain type hydraulic hoist, preferably, the chain type hydraulic hoist further comprises a chain stopper, and the chain stopper is fixedly arranged outside the chain type hydraulic hoist after being fixedly connected with the hoist chain.

The invention has the outstanding effects that:

the chain type hydraulic hoist generates larger load through more planetary gears, reduces the friction between the planetary gear set and the primary gear and the secondary gear by using the friction reducing pad, and reduces power loss, thereby meeting the requirements of low labor intensity and large load.

Furthermore, the chain type hydraulic hoist uses a larger gear ratio to generate larger load, uses the main chain splitter and the auxiliary chain splitter to enable the hoist chain to smoothly slide so as to reduce resistance, and has stronger load improvement effect due to multi-angle cooperation.

Drawings

Fig. 1a is a side view of a chain hydraulic block of the present invention;

fig. 1b is a schematic structural view of a chain type hydraulic block of the present invention;

fig. 2 is a schematic structural view of a speed reducing unit in the chain type hydraulic block of the present invention;

fig. 3 is a schematic structural diagram of a hoisting and traction unit in the chain type hydraulic hoist of the invention.

Detailed Description

In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention is provided, but the technical solutions of the present invention are not to be construed as limiting the implementable scope of the present invention.

Fig. 1-3 are illustrations of one embodiment of the present invention.

One embodiment of the present invention: providing a chain type hydraulic hoist, as shown in fig. 1a and 1b, comprising a braking unit 1, a speed reducing unit 2, a hoisting and traction unit 3, a hydraulic driving unit 4 and a hook assembly 6; the hydraulic driving unit 4, the hoisting and traction unit 3, the speed reduction unit 2 and the braking unit 1 are fixedly connected in sequence. The lifting hook assembly 6 is connected to a hoisting and towing unit through a hoist chain.

The hydraulic driving unit 4 transmits the rotation of the rotor shaft (which is a rotating shaft for power output of the hydraulic driving unit) to a central wheel shaft 201 of the speed reducing unit 2, and transmits the rotation to a driving sprocket 37 of the hoisting and traction unit 3 after speed reduction and torque increase of the speed reducing unit, the hoisting and traction unit 3 is connected with the lifting hook assembly 6 through a hoist chain, and the hoist chain is driven by the driving sprocket 37 to reciprocate. The lifting hook assembly is driven by the hoist chain to do reciprocating motion.

The brake unit 1 is used to reduce or stop the rotation of the center wheel shaft;

in this embodiment, the hydraulic driving unit 4 is powered by hydraulic driving, and further drives the rotor shaft to rotate to output power. The brake unit 1 is a brake, which may be a commercially available service brake, and mainly provides a braking force, especially a parking mechanical brake in a lifting state, so as to provide a stable and safe braking force when a lifted object is kept at a certain height above the ground.

The lifting hook assembly 6 is the design of conventional assembly pulley lifting hook, realizes sharing of stranded effort, and the lifting hook assembly includes lifting hook wheel and lifting hook, and the lifting hook wheel is connected to the lifting hook, and the lifting hook wheel is a stiff end of calabash chain, and the chain stopper is connected to the other end, and the pulley that the calabash chain was walked around the lifting hook wheel again behind driven sprocket 36 by the fixed impetus of lifting hook wheel is at the assembly pulley of detour driving sprocket, realization 3 times effort.

As shown in fig. 2, the reduction unit 2 includes:

the central wheel shafts 201 and the 4 parallel wheel shafts 206 are provided with external gears which are meshed with each other, the external gears of the parallel wheel shafts 206 are not interfered with each other, and the central wheel shafts 201 and the 4 parallel wheel shafts 206 form a planetary gear set;

in this embodiment, 4 parallel axles 206 are selected to form the planetary gear set, so that the stress is more uniform, the generated torque is larger, and the mutual interference is small. In other embodiments, planetary gear sets may be constructed considering 5, 6 or even more parallel axles, which are similar alternatives to the present solution.

A secondary ring gear 205 and a primary ring gear 207; the inner side surfaces of the primary gear ring 207 and the secondary gear ring 205 are teeth, and the outer side surfaces are attached to the shell 203 of the speed reducing unit and slide relatively; the primary gear ring 207 and the secondary gear ring 205 rotate around the central hub 201; the primary gear ring 207 and the secondary gear ring 205 are sleeved on the periphery of the parallel wheel shafts 206 in parallel and are respectively meshed with the outer gears of the 4 parallel wheel shafts 206; the secondary gear ring 205 is driven by the parallel wheel shaft 206 to rotate, and the torque transmission generated by the parallel wheel shaft 206 and the reverse torque generated after the torque is applied to the primary gear 208 are applied to the secondary gear ring 207 to form torque output.

In this embodiment, the casing of the reduction unit is a carrier for fixing all the components of the reduction unit, and all the components are tightly combined into a whole. The inside can add machine oil or lubricating oil, is sealed by the seal receptacle. The center hub 201 penetrates the casing 203 of the speed reduction unit, and the center hub 201 and the casing 203 of the speed reduction unit are sealed by a small seal seat 210. The connection of the center hub 201 to the housing 203 of the reduction unit is a bearing 211. It may not be sealed if no lubrication is present.

A primary gear 208 that is meshed with the primary ring gear 207 and rotates about a center wheel axis; the primary gear 208 is fixedly connected with the shell 203 of the speed reducing unit; the size of the first-stage gear can be large or small, only the first-stage gear ring needs to be locked, and the fixing position and the integrity of the gear can be adjusted. In the present embodiment, the relative position of the primary gear 208 and the housing 203 of the reduction unit is also adjusted and fixed by the positioning pin 212.

A secondary gear 204 that is engaged with the secondary ring gear 205 and rotates about the center hub 201; the secondary gear 204 does not interfere with the center hub 201; the secondary gear 204 rotates in the outer shell 203 of the speed reducing unit through a limiting mechanism, and the secondary gear 205 is driven by the secondary gear ring 205 to transmit the rotation to the driving sprocket 302 of the hoisting and traction unit.

The central axle 201 penetrates through the primary gear 208 and the secondary gear 204, and the 4 parallel axles 206 are arranged between the primary gear 208 and the secondary gear 204;

friction reducing pads 209 disposed between the primary gear 208, the secondary gear 204, and the planetary gear set 206, respectively. The material of the friction reducing pad is polyether material, can be PEEK material, is the key point for eliminating mechanical friction resistance; the PEEK high-quality material is selected, so that the abrasion among parts is greatly reduced, and the efficiency in transmission can be greatly improved due to the extremely low friction coefficient.

In this embodiment, 4 parallel wheel shafts 206 can be floatingly disposed in the enclosed space formed by the primary gear 208, the secondary gear 204, the primary gear ring 207, and the secondary gear ring 205, and the positions are adjusted to realize planetary rotation without mutual interference. This condition, coupled with the use of the friction reducing pad 209, reduces the use of the planet carrier, resulting in less friction, less power loss, and greater load.

In a further embodiment, the 4 parallel axles 206 form a planetary gear set with the central axle 201 through a planet carrier, and this configuration makes the rotation of the 4 parallel axles more stable and reduces the chattering.

In the present embodiment, one end of the center wheel shaft 201 is fixed by the outer casing 203 of the speed reducing unit, and the other end is connected with the coupling of the hoisting and pulling unit 3, and is not fixed with the outer casing 203 of the speed reducing unit, and is a semi-floating connection; meanwhile, the parallel wheel shaft 201, the primary gear ring 207, the secondary gear ring 205 and the secondary gear 204 are in a floating state, a self-correcting mechanical transmission structure can be formed, and the problems of mechanical clamping stagnation and low efficiency are solved.

In the embodiment, the external gear of the parallel wheel shaft is a duplicate gear, and the gear ratio of the external gear meshed with the central wheel shaft and the secondary gear ring is 24/21; the number of teeth of the center wheel shaft is as follows: number of parallel axles: double pinion 24/21, number of teeth of primary ring gear: 60, number of teeth of the primary gear: 60, number of teeth of the secondary ring gear: 57, number of teeth of the secondary gear: 57. the gear set uses a larger gear ratio, so that the speed and the torque can be effectively reduced and increased, and the load is increased.

In a further embodiment, the reduction unit further comprises a sealing seat 202, through which the secondary gear 204 is hermetically connected to the housing 203 of the reduction unit. The casing of the speed reducing unit is a carrier for fixing all the parts of the speed reducing unit, and all the parts are tightly combined into a whole. The inside can add machine oil or lubricating oil, is sealed by the seal receptacle. It may not be sealed if no lubricant is added.

In the present embodiment, the casing 203 of the reduction unit is provided with the vent hole 213 at a position corresponding to the secondary ring gear 205, and the air pressure in the closed space can be released through the vent hole, or the lubricant can be injected and closed by the plug 214.

In this embodiment, as shown in fig. 1b and 3, the hoisting and pulling unit 3 includes:

a shaft coupling with a motor spline shaft coupling 310 at one end, wherein the other end of the shaft coupling is fixedly connected with the central wheel shaft 201, and the motor spline shaft coupling 310 is connected with the rotor shaft of the hydraulic drive unit;

the driving chain wheel 32 and the driven chain wheel 37 are sleeved on the coupling shaft in parallel and rotate relative to the coupling shaft, and the driving chain wheel 32 is fixedly connected with the secondary gear 24;

the driving chain wheel shell 31 is sleeved outside the driving chain wheel 32, and the driving chain wheel 32 is movably connected with the driving chain wheel shell 31 through a ball bearing 38 and a roller bearing 33;

the driven sprocket housing 36 is sleeved outside the driven sprocket 37 and fixedly connected with the housing 31 of the driving sprocket through flanges 39 at two ends, and the driven sprocket 37 is movably connected with the driven sprocket housing through a ball bearing 38 and a roller bearing 33; in this embodiment, roller bearings are selected for use between the driving and driven sprockets, and ball bearings are selected for use at both ends, so that the driving and driven sprockets can operate more stably and can bear large acting force.

The roller bearings 38 adjacent to the driving sprocket 32 and the driven sprocket 37 are separated by a bearing spacer 34; in a further embodiment, the main driven sprocket and the main driven sprocket housing are separated by an intermediate partition 35 to prevent the two roller bearings 38 from interfering with each other.

A main chain splitter 311 disposed at a lower portion of the driving sprocket housing 31, through which the hoist chain is connected to the driving sprocket 32;

a slave chain divider 312 is provided at a lower portion of the driven sprocket housing 36, and the hoist chain is connected to the driven sprocket 37 through the slave chain divider 312. The master-slave chain splitter adopts conventional commercial products.

In this specific embodiment, this chain hydraulic block still includes

protection casing

5, 5 covers of protection casing are established hydraulic drive unit 4's outside plays the effect of protection hydraulic drive unit 4.

In this embodiment, as shown in fig. 1a, the chain type hydraulic hoist further includes a chain stopper 7, and the chain stopper 7 is fixedly connected with the hoist chain 8 and then fixedly disposed outside the chain type hydraulic hoist.

In this embodiment, the hoist chain is high strength jack-up hoist chain, and the specification 16X48 jack-up hoist chain of chooseing for use is high strength national standard lifting chain, and rated single loading capacity is 8T, and breaking force 200kN design maximum loading capacity is 6T among the hydraulic winch, and factor of safety is reasonable, and the lifting chain has plastic deformation's performance characteristics, has avoided the danger that sudden overload fracture caused. The flanges are connected together by M20 high-strength long screws, and flange holes on two sides of the flanges can be used for installing the hydraulic drive unit and the speed reduction unit. The hoisting and traction unit 3 forms a wheel train with 3 times of amplification consisting of a driving wheel, a driven wheel and a hook assembly. The basic function of the chain type hydraulic hoisting hoist structure is realized, and the combination of the chain type hydraulic hoisting hoist structure and the high-strength hoisting chain and the lifting hook assembly can complete hoisting and putting down of heavy objects.

The 18T chain type hydraulic hoist of the coal mine support carrier is driven and controlled by hydraulic transmission, a hydraulic driving and controlling element suitable for special operation conditions is adopted in the structure, stepless speed change and convenient control of the hydraulic hoisting hoist can be realized, a large-speed-ratio planetary speed reducing mechanism can increase hoisting power, the structural characteristics that the device is small in size and can bear large load are achieved, and the defect of a steel wire rope in use can be avoided by adopting a high-strength hoisting chain.

The hydraulic motor for hydraulic driving and control adopts a cycloid hydraulic motor, and the hydraulic hoist has the characteristics of compact structure and small volume under the condition that the driving power is met, so that the overall size of the hydraulic hoist can be reduced, and the cost is reduced. The integrated hydraulic control valve bank also achieves the purposes of small volume, light weight and simple and convenient adjustment. The integrated hydraulic control valve group and the hydraulic motor are organically integrated together, so that hydraulic control is reasonable and practical, a pipeline leakage point is avoided, and the installation space is saved.

The connection mode of the hoisting traction direct-drive device and the planetary reducer adopts a driving chain wheel shell, a driving chain wheel, a planetary reducer sealing seat, a bearing isolation sleeve, an intermediate baffle, a driven chain wheel shell, a driven chain wheel and a flange, and parts are mutually supported, positioned and connected together by utilizing the high-precision size of a bearing inner hole and an excircle, so that the positioning surface of each part is reduced, and the structure is simplified and practical.

The large-speed-ratio planetary reducer improves the lifting capacity of the hoisting block. The volume of the hydraulic hoist crane cannot be increased on the premise that the rated load is multiplied, a foundation is laid for the expansion of the performance of the hoist crane, the selected steel material is used under the condition that the steel material accords with the underground operation condition of a mine, explosion-proof potential safety hazards are avoided, and the hydraulic hoist crane is suitable for being used underground of the coal mine.

Therefore, the chain type hydraulic hoist disclosed by the invention combines the hydraulic drive with the hoisting chain, so that the hydraulic hoisting hoist is small in size, large in load capacity, convenient to install and debug and beneficial to the selective use of a host factory. The stepless speed change characteristic of hydraulic drive and the function of the hydraulic motor for convenient forward and reverse directions enable the hydraulic hoist to be convenient to operate and control. The reasonable application of the hydraulic safety valve, the balance valve and the hydraulic brake and the hoisting mode in the form of the hoisting chain not only avoid the defects in the use of the steel wire rope, but also ensure that the hydraulic hoisting block is safe and reliable in the whole working process and the structural characteristics of the hydraulic hoisting block are convenient for the use in mines and underground.

Claims

1. A chain hydraulic block is characterized in that: the chain type hydraulic hoist comprises a braking unit, a speed reducing unit, a hoisting and traction unit, a hydraulic driving unit and a lifting hook assembly;

the hydraulic driving unit transmits power to a central wheel shaft of the speed reducing unit from the rotation of a rotor shaft of the hydraulic driving unit, the power is transmitted to a driving chain wheel of the hoisting and traction unit after being reduced and torque-increased by the speed reducing unit, the hoisting and traction unit is connected with the lifting hook assembly through a hoist chain, and the hoist chain reciprocates under the driving of the driving chain wheel;

the braking unit is used for reducing or stopping the rotation of the central wheel shaft;

wherein the speed reduction unit includes:

the central wheel shaft penetrates through the primary gear and the secondary gear, and the at least 4 parallel wheel shafts are arranged between the primary gear and the secondary gear;

2. The chain hydraulic hoist according to claim 1, characterized in that: the external gear of the parallel wheel shaft is a duplicate gear, and the gear ratio of the external gear meshed with the central wheel shaft and the secondary gear ring is 24/21.

3. The chain hydraulic hoist according to claim 2, characterized in that: the number of teeth of the center wheel shaft, the number of teeth of the dual gear of the parallel wheel shaft, the number of teeth of the primary gear ring, the number of teeth of the secondary gear ring, is 12, 24/21, 60, 57 and 57.

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

5. The chain hydraulic hoist according to claim 1, characterized in that: the material of the friction reducing pad is polyether material.

6. The chain hydraulic hoist according to claim 1, characterized in that: the speed reducing unit further comprises a sealing seat, and the secondary gear is hermetically connected with the shell of the speed reducing unit through the sealing seat.

7. The chain hydraulic hoist according to claim 1, characterized in that: the speed reduction unit also comprises a small sealing seat, and the central wheel shaft penetrates through the shell of the speed reduction unit and is hermetically connected with the shell through the small sealing seat.

8. The chain hydraulic hoist according to claim 1, characterized in that: the hoisting traction unit comprises:

9. The chain hydraulic hoist according to claim 1, characterized in that: the chain type hydraulic hoist further comprises a protective cover, wherein the protective cover is sleeved outside the hydraulic driving unit.

10. The chain hydraulic hoist according to claim 1, characterized in that: the chain type hydraulic hoist further comprises a chain stopper, wherein the chain stopper is fixedly arranged outside the chain type hydraulic hoist after being fixedly connected with the hoist chain.