CN209455995U - A kind of differential type hoist lifting device - Google Patents

Abstract

The utility model discloses a differential hoisting device, which belongs to the field of hoisting machinery and comprises a bearing seat, a reel shaft, a fixed pulley assembly, a movable pulley assembly, a hoisting rope and a reducer, and is characterized in that it also includes a differential The moving reel set, coupling and motor, the differential reel set is fixed on the reel shaft, the differential reel set is integrally formed by the first differential reel and the second differential reel, the first differential The diameter of the driving drum is larger than that of the second differential drum, one end of the hoisting rope is fixed on the end of the first differential drum, the other end is fixed on the end of the second differential drum, and the shaft of the drum is One end is connected with the bearing seat, the other end is connected with the reducer, one end of the coupling is connected with the reducer, the other end is connected with the motor, and a brake is installed at the coupling. The utility model can realize large-capacity and low-speed lifting of the hoisting mechanism by adopting a differential drum group and a specific rope winding method, thereby ensuring the stability and safety of the hoisting.

Description

A differential winch lifting device

technical field

The utility model relates to the technical field of hoisting machinery, in particular to a differential winch lifting device.

Background technique

A hoist is a light and small lifting device that uses a drum to wind a wire rope or chain to lift or pull heavy objects, also known as a winch. The hoist can lift heavy objects vertically, horizontally or obliquely. The hoist is divided into three types: manual hoist, electric hoist and hydraulic hoist. Now mainly electric hoist. It can be used alone or as a component in lifting, road building and mine hoisting machinery. It is widely used because of its simple operation, large amount of rope winding and convenient displacement.

The traditional hoisting method generally adopts a double-connected single-drum structure, and the two hoisting ropes are wound onto the drum from the same radial side of the drum. When the driving device drives the reel to rotate, the two ropes are all wound into the drum rope groove or wound out of the rope groove at the same time. The resistance moments produced by the two ropes on the reel are in the same direction and are superimposed. The main resistance moment to be overcome when the driving device is working is the sum of the resistance moments produced by the two ropes on the reel. Therefore, for the single-drum hoisting mechanism, its hoisting load is limited by the bearing capacity of the drive part of the reducer and cannot be very large, and the lifting speed is limited by the speed ratio of the reducer and cannot achieve a micro speed. The multi-drum hoisting mechanism can realize large-capacity and low-speed hoisting functions, but its appearance and layout are huge, the workload of investment construction, operation and maintenance is large, and the cost is relatively high.

The publication number is CN 206606957 U, and the Chinese patent document published on November 03, 2017 discloses a rope hoisting mechanism for cranes, which is characterized in that it includes a hydraulic motor, a frame, a reel, a brake, a differential planetary Gear train, steel wire rope and rope presser; the reel is set in the frame for rotation connection, and the inside of the reel is provided with a differential planetary gear train and a brake, and the hydraulic motor is connected with the reel through the differential planetary gear train Transmission connection; the outer wall of the reel is wound with a wire rope, and the frame is provided with a rope clamp for limiting the wire rope.

The rope-threading winch mechanism for cranes disclosed in this patent document adopts the integrated drum design of the drum and the ring gear, and has a built-in two-stage differential gear train structure. The size is small and the structure is compact, so that the overall size of the rope winch can be reduced. However, it is impossible to realize large-capacity and low-speed lifting of the hoisting mechanism, and the lifting stability and safety are not good enough.

Utility model content

In order to overcome the defects of the above-mentioned prior art, the utility model provides a differential winch lifting device. The utility model can realize large-capacity hoisting mechanism and low-speed lifting by adopting a differential drum group and a specific rope winding method. , to ensure the lifting stability and safety.

The utility model is realized through the following technical solutions:

A differential winch lifting device, comprising a bearing seat, a drum shaft, a fixed pulley assembly, a movable pulley assembly, a hoisting rope, a first rope pressing plate assembly, a second rope pressing plate assembly and a reducer, the hoisting rope is wound on On the movable pulley assembly and the fixed pulley assembly, it is characterized in that it also includes a differential reel set, a coupling and a motor, the differential reel set is fixed on the reel shaft, and the differential reel set is controlled by the first differential The drum and the second differential drum are integrally formed, the diameter of the first differential drum is larger than the diameter of the second differential drum, and one end of the lifting rope is fixed by the first rope pressing plate assembly on the second differential drum. The end of a differential drum, the other end of the hoisting rope is fixed on the end of the second differential drum through the second rope clamping plate assembly, one end of the drum shaft is connected to the bearing seat, and the other end of the drum shaft One end is connected with the reducer, one end of the coupling is connected with the reducer, the other end of the coupling is connected with the motor, and a brake is installed at the coupling.

The fixed pulley assembly is located below the differential reel assembly, the movable pulley assembly is located below the fixed pulley assembly, the axes of the differential reel assembly and the fixed pulley assembly are parallel to each other, and the axes of the fixed pulley assembly and the movable pulley assembly are parallel to each other.

The first differential drum has a first drum rope groove, and the second differential drum has a second drum rope groove. The cross-sectional size of the first drum rope groove is the same as that of the second drum. The cross-sectional dimensions of the rope grooves are the same size.

The direction of rotation of the rope groove of the first drum is the same as that of the rope groove of the second drum.

One end of the hoisting rope is wound in from the second drum rope groove of the second differential drum, and the other end of the hoisting rope is wound out from the first drum rope groove of the first differential drum.

The depth of the first drum rope groove is 0.3 times the diameter of the hoisting rope, and the depth of the first drum rope groove is the same as that of the second drum rope groove.

The working principle of the utility model is as follows:

1. Since the two ends of the hoisting rope come out from the radial sides of the differential drum set respectively, the additional resistance moment of the two ends of the hoisting rope to the differential drum set is in a subtractive relationship, so the reducer needs to overcome The resistance moment on the differential drum set is calculated by formula 1:

Among them, M is the resistance moment, G is the weight of the lifting item, D is the winding diameter of the hoisting rope on the first differential drum, d is the winding diameter of the hoisting rope on the second differential drum, and a is the diameter of the movable pulley assembly Number of pulleys;

It can be seen from formula 1 that when the weight G of the lifting item is constant and the number of pulleys a of the movable pulley assembly is constant, the resistance moment M on the differential drum set that the reducer needs to overcome is determined by the lifting rope on the first differential drum The difference between the winding diameter D and the winding diameter d of the hoisting rope on the second differential drum is determined. The smaller the difference is, the smaller the resistance moment M is, that is, the lower the load-bearing requirement for the reducer.

2. When the motor drives the differential drum set to rotate, since the two ends of the hoisting rope come out from the radial sides of the differential drum set respectively, the lifting speed is calculated by formula 2:

Among them, V is the lifting speed, i is the transmission ratio of the reducer, and n is the speed of the motor;

It can be known from formula 2 that when the number a of the pulleys of the movable pulley assembly is constant, the transmission ratio i of the reducer is constant, and the speed n of the motor is constant, the lifting speed is determined by the winding diameter D of the hoisting rope on the first differential drum and the second difference The difference between the winding diameter d of the hoisting rope on the moving drum is determined, the smaller the difference, the lower the lifting speed V.

3. When the lifting speed V is a given value, the formula for calculating the transmission ratio of the reducer is:

It can be seen from formula 3 that when the lifting speed V is a given value, the number a of the pulleys of the movable pulley assembly is constant, and the speed n of the motor is constant, the transmission ratio i of the reducer is determined by the winding diameter of the hoisting rope on the first differential drum The difference between D and the winding diameter d of the hoisting rope on the second differential drum is determined, the smaller the difference, the lower the transmission ratio i of the required speed reducer.

The beneficial effects of the utility model are mainly manifested in the following aspects:

1. In this utility model, the differential reel set is fixed on the reel shaft, and the differential reel set is integrally formed by the first differential reel and the second differential reel. The diameter of the first differential reel Larger than the diameter of the second differential drum, one end of the hoisting rope is fixed on the end of the first differential drum through the first rope clamp assembly, and the other end of the hoisting rope is fixed on the second differential drum through the second rope clamp assembly. At the end of the moving reel, one end of the reel shaft is connected to the bearing seat, the other end of the reel shaft is connected to the reducer, one end of the coupling is connected to the reducer, the other end of the coupling is connected to the motor, and the coupling A brake is installed at the device. When in use, since the first differential drum and the second differential drum of the differential drum set are set to have different diameters, the two ends of the hoisting rope are attached to the differential drum set. The resistance torque is a reduction relationship, which can reduce the load-bearing requirements of the reducer. Therefore, compared with the Chinese patent document with the publication number CN 206606957U, it can achieve large-capacity and low-speed lifting of the lifting mechanism, ensuring lifting stability and safety. .

2. In the utility model, the fixed pulley assembly is located below the differential reel assembly, the movable pulley assembly is located below the fixed pulley assembly, the axis of the differential reel assembly is parallel to the axis of the fixed pulley assembly, and the axis of the fixed pulley assembly is parallel to the axis of the movable pulley assembly. The axes are parallel to each other, and the fixed pulley assembly, differential drum set and movable pulley assembly adopt this specific layout, which is conducive to improving the stability and smoothness of lifting when lifting objects.

3. In the utility model, a first drum rope groove is opened on the first differential drum, a second drum rope groove is opened on the second differential drum, and the cross-sectional size of the first drum rope groove is the same as The cross-sectional dimensions of the rope grooves of the second drums are the same, which is beneficial to improving the winding stability of the hoisting rope on the entire differential drum set.

4. In the utility model, the direction of rotation of the rope groove of the first drum is the same as that of the rope groove of the second drum, so that objects can be lifted more smoothly.

5. In the utility model, one end of the hoisting rope is wound in from the second drum rope groove of the second differential drum, and the other end of the hoisting rope is wound out of the first drum rope groove of the first differential drum , can better reduce the lifting speed, so as to realize low-speed lifting, so as to ensure the safety of lifting.

6. In the present utility model, the depth of the first drum rope groove is 0.3 times of the diameter of the hoisting rope, and the depth of the first drum rope groove is the same as that of the second drum rope groove. The depth is set to 0.3 times the diameter of the hoisting rope, which can further improve the winding stability of the hoisting rope.

Description of drawings

The utility model will be further specifically described below in conjunction with the accompanying drawings and specific embodiments, wherein:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a side view of the utility model;

Marks in the figure: 1. Bearing seat, 2. Drum shaft, 3. Fixed pulley assembly, 4. Moving pulley assembly, 5. Hoisting rope, 6. The first rope pressing plate assembly, 7. The second rope pressing plate assembly, 8. Reducer, 9, coupling, 10, motor, 11, first differential drum, 12, second differential drum, 13, brake, 14, first drum rope groove, 15, second drum rope groove.

Detailed ways

Example 1

A differential winch lifting device, comprising a bearing seat 1, a drum shaft 2, a fixed pulley assembly 3, a movable pulley assembly 4, a hoisting rope 5, a first rope pressing plate assembly 6, a second rope pressing plate assembly 7 and a reducer 8. The hoisting rope 5 is wound on the movable pulley assembly 4 and the fixed pulley assembly 3, and also includes a differential drum set, a coupling 9 and a motor 10, and the differential drum set is fixed on the drum shaft 2, The differential reel set is integrally formed by a first differential reel 11 and a second differential reel 12, the diameter of the first differential reel 11 is larger than the diameter of the second differential reel 12, the One end of the hoisting rope 5 is fixed on the end of the first differential drum 11 through the first rope clamp assembly 6, and the other end of the hoisting rope 5 is fixed on the end of the second differential drum 12 through the second rope clamp assembly 7. One end of the reel shaft 2 is connected to the bearing seat 1, the other end of the reel shaft 2 is connected to the reducer 8, one end of the coupling 9 is connected to the reducer 8, and the other end of the coupling 9 One end is connected with the motor 10, and a brake 13 is installed at the coupling 9.

This embodiment is the most basic implementation. The differential reel set is fixed on the reel shaft. The differential reel set is integrally formed by the first differential reel and the second differential reel. The diameter of the drum is larger than that of the second differential drum, one end of the hoisting rope is fixed on the end of the first differential drum through the first rope clamp assembly, and the other end of the hoisting rope is fixed through the second rope clamp assembly At the end of the second differential drum, one end of the drum shaft is connected to the bearing seat, the other end of the drum shaft is connected to the reducer, one end of the coupling is connected to the reducer, and the other end of the coupling is connected to the motor Connection, the brake is installed at the coupling, when in use, since the first differential drum and the second differential drum of the differential drum set are set to different diameters, the two ends of the hoisting rope are differential The additional resistance moment of the reel group is in the relationship of reduction, which can reduce the load-bearing requirements of the reducer. Therefore, compared with the Chinese patent document with the publication number CN 206606957U, it can realize large-capacity and low-speed lifting of the lifting mechanism, ensuring stable lifting. sex and safety.

Example 2

A differential winch lifting device, comprising a bearing seat 1, a drum shaft 2, a fixed pulley assembly 3, a movable pulley assembly 4, a hoisting rope 5, a first rope pressing plate assembly 6, a second rope pressing plate assembly 7 and a reducer 8. The hoisting rope 5 is wound on the movable pulley assembly 4 and the fixed pulley assembly 3, and also includes a differential drum set, a coupling 9 and a motor 10, and the differential drum set is fixed on the drum shaft 2, The differential reel set is integrally formed by a first differential reel 11 and a second differential reel 12, the diameter of the first differential reel 11 is larger than the diameter of the second differential reel 12, the One end of the hoisting rope 5 is fixed on the end of the first differential drum 11 through the first rope clamp assembly 6, and the other end of the hoisting rope 5 is fixed on the end of the second differential drum 12 through the second rope clamp assembly 7. One end of the reel shaft 2 is connected to the bearing seat 1, the other end of the reel shaft 2 is connected to the reducer 8, one end of the coupling 9 is connected to the reducer 8, and the other end of the coupling 9 One end is connected with the motor 10, and a brake 13 is installed at the coupling 9.

The fixed pulley assembly 3 is located below the differential reel assembly, the movable pulley assembly 4 is located below the fixed pulley assembly 3, the axis of the differential reel assembly is parallel to the axis of the fixed pulley assembly 3, and the axis of the fixed pulley assembly 3 is parallel to the movable pulley assembly. The axes of 4 are parallel to each other.

This embodiment is a preferred implementation mode, the fixed pulley assembly is located under the differential reel assembly, the movable pulley assembly is located under the fixed pulley assembly, the axis of the differential reel assembly and the axis of the fixed pulley assembly are parallel to each other, and the axis of the fixed pulley assembly The axes of the movable pulley assembly are parallel to each other, and the fixed pulley assembly, differential drum set and movable pulley assembly adopt this specific layout, which is beneficial to improve the stability and smoothness of lifting when lifting objects.

Example 3

A differential winch lifting device, comprising a bearing seat 1, a drum shaft 2, a fixed pulley assembly 3, a movable pulley assembly 4, a hoisting rope 5, a first rope pressing plate assembly 6, a second rope pressing plate assembly 7 and a reducer 8. The hoisting rope 5 is wound on the movable pulley assembly 4 and the fixed pulley assembly 3, and also includes a differential drum set, a coupling 9 and a motor 10, and the differential drum set is fixed on the drum shaft 2, The differential reel set is integrally formed by a first differential reel 11 and a second differential reel 12, the diameter of the first differential reel 11 is larger than the diameter of the second differential reel 12, the One end of the hoisting rope 5 is fixed on the end of the first differential drum 11 through the first rope clamp assembly 6, and the other end of the hoisting rope 5 is fixed on the end of the second differential drum 12 through the second rope clamp assembly 7. One end of the reel shaft 2 is connected to the bearing seat 1, the other end of the reel shaft 2 is connected to the reducer 8, one end of the coupling 9 is connected to the reducer 8, and the other end of the coupling 9 One end is connected with the motor 10, and a brake 13 is installed at the coupling 9.

The fixed pulley assembly 3 is located below the differential reel assembly, the movable pulley assembly 4 is located below the fixed pulley assembly 3, the axis of the differential reel assembly is parallel to the axis of the fixed pulley assembly 3, and the axis of the fixed pulley assembly 3 is parallel to the movable pulley assembly. The axes of 4 are parallel to each other.

The first differential drum 11 is provided with a first drum rope groove 14, and the second differential drum 12 is provided with a second drum rope groove 15. The cross-sectional size of the first drum rope groove 14 is Same as the cross-sectional size of the second drum rope groove 15.

The rotation direction of the rope groove of the first drum rope groove 14 is the same as that of the second drum rope groove 15 .

This embodiment is yet another preferred implementation mode. The first differential drum is provided with a first drum rope groove, and the second differential drum is provided with a second drum rope groove. The size of the cross-section is the same as that of the rope groove of the second drum, which is beneficial to improving the winding stability of the hoisting rope on the entire differential drum set.

The direction of rotation of the rope groove of the first drum is the same as that of the rope groove of the second drum, so that objects can be lifted more smoothly.

Example 4

A differential winch lifting device, comprising a bearing seat 1, a drum shaft 2, a fixed pulley assembly 3, a movable pulley assembly 4, a hoisting rope 5, a first rope pressing plate assembly 6, a second rope pressing plate assembly 7 and a reducer 8. The hoisting rope 5 is wound on the movable pulley assembly 4 and the fixed pulley assembly 3, and also includes a differential drum set, a coupling 9 and a motor 10, and the differential drum set is fixed on the drum shaft 2, The differential reel set is integrally formed by a first differential reel 11 and a second differential reel 12, the diameter of the first differential reel 11 is larger than the diameter of the second differential reel 12, the One end of the hoisting rope 5 is fixed on the end of the first differential drum 11 through the first rope clamp assembly 6, and the other end of the hoisting rope 5 is fixed on the end of the second differential drum 12 through the second rope clamp assembly 7. One end of the reel shaft 2 is connected to the bearing seat 1, the other end of the reel shaft 2 is connected to the reducer 8, one end of the coupling 9 is connected to the reducer 8, and the other end of the coupling 9 One end is connected with the motor 10, and a brake 13 is installed at the coupling 9.

The fixed pulley assembly 3 is located below the differential reel assembly, the movable pulley assembly 4 is located below the fixed pulley assembly 3, the axis of the differential reel assembly is parallel to the axis of the fixed pulley assembly 3, and the axis of the fixed pulley assembly 3 is parallel to the movable pulley assembly. The axes of 4 are parallel to each other.

The first differential drum 11 is provided with a first drum rope groove 14, and the second differential drum 12 is provided with a second drum rope groove 15. The cross-sectional size of the first drum rope groove 14 is Same as the cross-sectional size of the second drum rope groove 15.

The rotation direction of the rope groove of the first drum rope groove 14 is the same as that of the second drum rope groove 15 .

One end of the hoisting rope 5 winds in from the second drum rope groove 15 of the second differential drum 12 , and the other end of the hoisting rope 5 winds in from the first drum rope groove 14 of the first differential drum 11 . out.

This embodiment is yet another preferred implementation mode. One end of the hoisting rope is wound in from the second drum rope groove of the second differential drum, and the other end of the hoisting rope is wound in from the first roll of the first differential drum. The drum rope groove is wrapped around, which can better reduce the lifting speed, so as to realize the lifting at a low speed, so as to ensure the safety of lifting.

Example 5

A differential winch lifting device, comprising a bearing seat 1, a drum shaft 2, a fixed pulley assembly 3, a movable pulley assembly 4, a hoisting rope 5, a first rope pressing plate assembly 6, a second rope pressing plate assembly 7 and a reducer 8. The hoisting rope 5 is wound on the movable pulley assembly 4 and the fixed pulley assembly 3, and also includes a differential drum set, a coupling 9 and a motor 10, and the differential drum set is fixed on the drum shaft 2, The differential reel set is integrally formed by a first differential reel 11 and a second differential reel 12, the diameter of the first differential reel 11 is larger than the diameter of the second differential reel 12, the One end of the hoisting rope 5 is fixed on the end of the first differential drum 11 through the first rope clamp assembly 6, and the other end of the hoisting rope 5 is fixed on the end of the second differential drum 12 through the second rope clamp assembly 7. One end of the reel shaft 2 is connected to the bearing seat 1, the other end of the reel shaft 2 is connected to the reducer 8, one end of the coupling 9 is connected to the reducer 8, and the other end of the coupling 9 One end is connected with the motor 10, and a brake 13 is installed at the coupling 9.

The fixed pulley assembly 3 is located below the differential reel assembly, the movable pulley assembly 4 is located below the fixed pulley assembly 3, the axis of the differential reel assembly is parallel to the axis of the fixed pulley assembly 3, and the axis of the fixed pulley assembly 3 is parallel to the movable pulley assembly. The axes of 4 are parallel to each other.

The first differential drum 11 is provided with a first drum rope groove 14, and the second differential drum 12 is provided with a second drum rope groove 15. The cross-sectional size of the first drum rope groove 14 is Same as the cross-sectional size of the second drum rope groove 15.

The rotation direction of the rope groove of the first drum rope groove 14 is the same as that of the second drum rope groove 15 .

One end of the hoisting rope 5 winds in from the second drum rope groove 15 of the second differential drum 12 , and the other end of the hoisting rope 5 winds in from the first drum rope groove 14 of the first differential drum 11 . out.

The depth of the first drum rope groove 14 is 0.3 times of the diameter of the hoisting rope 5 , and the depth of the first drum rope groove 14 is the same as that of the second drum rope groove 15 .

This embodiment is the best implementation mode. The differential reel set is fixed on the reel shaft. The differential reel set is integrally formed by the first differential reel and the second differential reel. The first differential reel The diameter of the cylinder is larger than that of the second differential drum, one end of the hoisting rope is fixed on the end of the first differential drum through the first rope clamp assembly, and the other end of the hoisting rope is fixed on the end of the first differential drum through the second rope clamp assembly. At the end of the second differential drum, one end of the drum shaft is connected to the bearing seat, the other end of the drum shaft is connected to the reducer, one end of the coupling is connected to the reducer, and the other end of the coupling is connected to the motor , a brake is installed at the coupling. When in use, since the first differential drum and the second differential drum of the differential drum set are set to different diameters, the two ends of the hoisting rope are opposite to the differential drum. The additional resistance moment of the barrel group is a reduction relationship, which can reduce the load-bearing requirements of the reducer. Therefore, compared with the Chinese patent document with the publication number CN206606957U, it can realize large-capacity and low-speed lifting of the lifting mechanism, ensuring lifting stability and safety.

One end of the hoisting rope is wound in from the second drum rope groove of the second differential drum, and the other end of the hoisting rope is wound out from the first drum rope groove of the first differential drum, which can better lower the Increase the speed to achieve low-speed lifting to ensure lifting safety.

The depth of the first drum rope groove is 0.3 times the diameter of the hoisting rope, and the depth of the first drum rope groove is the same as that of the second drum rope groove. By setting the depth of the first drum rope groove to the lifting 0.3 times the diameter of the rope can further improve the winding stability of the hoisting rope.

Claims (6)

1. A differential hoisting device, comprising a bearing seat (1), a drum shaft (2), a fixed pulley assembly (3), a movable pulley assembly (4), a lifting rope (5), and a first rope pressing plate Assembly (6), the second rope pressing plate assembly (7) and reducer (8), the hoisting rope (5) is wound on the movable pulley assembly (4) and the fixed pulley assembly (3), and it is characterized in that: it also includes differential A moving reel set, a coupling (9) and a motor (10), the differential reel set is fixed on the reel shaft (2), and the differential reel set consists of the first differential reel (11) and The second differential drum (12) is integrally formed, the diameter of the first differential drum (11) is larger than the diameter of the second differential drum (12), and one end of the lifting rope (5) The end of the first differential drum (11) is fixed by the first rope clamp assembly (6), and the other end of the hoisting rope (5) is fixed on the second differential drum by the second rope clamp assembly (7). (12), one end of the reel shaft (2) is connected with the bearing seat (1), the other end of the reel shaft (2) is connected with the reducer (8), and the shaft coupling (9) One end of the shaft coupling (9) is connected with the reducer (8), the other end of the shaft coupling (9) is connected with the motor (10), and a brake (13) is installed at the shaft coupling (9). 2. A differential winch lifting device according to claim 1, characterized in that: the fixed pulley assembly (3) is located below the differential drum group, and the movable pulley assembly (4) is located at the fixed pulley assembly (3 ), the axes of the differential drum set and the fixed pulley assembly (3) are parallel to each other, and the axes of the fixed pulley assembly (3) and the movable pulley assembly (4) are parallel to each other. 3. A differential hoisting device according to claim 1, characterized in that: the first differential drum (11) is provided with a first drum rope groove (14), and the second differential Have the second drum rope groove (15) on the moving drum (12), the cross-sectional size of the first drum rope groove (14) is the same as the cross-sectional size of the second drum rope groove (15). 4. A differential hoisting device according to claim 3, characterized in that: the rotation direction of the rope groove of the first drum rope (14) is the same as the direction of rotation of the rope groove of the second drum rope (15). The rope grooves rotate in the same direction. 5. A differential hoisting device according to claim 3, characterized in that: one end of the hoisting rope (5) passes through the second drum rope groove of the second differential drum (12). (15) winds in, and the other end of hoisting rope (5) winds out from the first drum rope groove (14) of the first differential drum (11). 6. A differential hoisting device according to claim 3, characterized in that: the depth of the first drum rope groove (14) is 0.3 times the diameter of the hoisting rope (5), the first The depth of the drum rope groove (14) is the same as the depth of the second drum rope groove (15).