CN218905218U

CN218905218U - Drum-type tooth-type coupling dismounting device

Info

Publication number: CN218905218U
Application number: CN202223119492.5U
Authority: CN
Inventors: 赵璐; 马玉强; 王文生; 刘焕伟; 赵永强
Original assignee: China Railway Inspection And Certification Changzhou Locomotive And Vehicle Parts Inspection Station Co ltd; CRRC Qishuyan Institute Co Ltd
Current assignee: China Railway Inspection And Certification Changzhou Locomotive And Vehicle Parts Inspection Station Co ltd; CRRC Qishuyan Institute Co Ltd
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-04-25
Anticipated expiration: 2032-11-23

Abstract

The utility model belongs to the technical field of disassembly tools, and discloses a drum-type tooth-type coupling disassembly device, which comprises: fixed subassembly, movable subassembly and driving piece. This dismounting device is when carrying out the shaft coupling dismantlement operation, fixed subassembly is fixed mutually with the motor shaft, and movable subassembly is fixed mutually with the shaft coupling, and the driving piece is installed on fixed subassembly, and the dismantlers controls the driving piece operation for the driving piece drives movable subassembly and shaft coupling and removes with the motor shaft relatively simultaneously, and the relatively fixed subassembly of movable subassembly removes with the drive shaft coupling relatively the motor shaft separation, realizes dismantling the purpose, controls simply, and it is convenient to dismantle.

Description

Drum-type tooth-type coupling dismounting device

Technical Field

The utility model relates to a disassembly tool, in particular to a disassembly device for a drum-type tooth-type coupling, which adopts an assembly mode that an inner taper hole of the drum-type tooth-type coupling is in interference fit with a shaft by a conical surface and is keyed, and is used when the drum-type tooth-type coupling with the structure is disassembled.

Background

The drum-shaped tooth-shaped coupling is a variable position rigid coupling which is arranged between a traction motor and a driving gear box of a rail transit train such as a train and a city rail, can compensate radial, axial, angle and comprehensive displacement between two shafts, plays a role in transmitting torque and rotating speed, and is an important component in a train gear transmission system.

The connection between the drum-shaped tooth-shaped coupling of the existing train and a motor shaft (gearbox shaft) mainly has two structures: the coupling with the structure is provided with an oil filling hole, the oil filling hole is communicated with the surface of the inner conical hole of the coupling, high-pressure oil is injected into the oil filling hole, the inner conical hole of the coupling is expanded by the high-pressure oil, and the coupling is automatically separated from the inner conical hole of a sleeved motor shaft due to the component force of axial separation of the conical surfaces. The technical schemes of the prior patents CN201020641266.1, CN201520511407.0 and CN201921433025.5 are all mentioned, and the disassembly mode is relatively mature and the operation is relatively simple.

The other is that the inner taper hole of the coupling and the shaft adopt the assembly mode of interference fit of conical surface and key, the coupling with the structure usually adopts the mode of heating the coupling on the induction heater when being installed, and the coupling is hot-sleeved on the motor shaft (gear box shaft) through the heated inner taper hole of the coupling. However, the coupling mounted on the motor shaft cannot be integrally heated during disassembly, so that external force is required to be used for drawing and disassembling the coupling, such as the coupling disassembling device with the patent number of CN201220279621.4, and after the coupling is hooked by the two semicircular disassembling frames, the coupling is disassembled from the motor shaft by applying a pulling force. Because the dismounting device is integrally and non-rigidly connected with the motor shaft, the centering of the piston rod of the hydraulic cylinder and the central shaft position of the motor shaft (gear box shaft) cannot be effectively ensured, the hydraulic cylinder is easy to deform due to uneven stress when the hydraulic cylinder applies tension, parts such as an inner tooth sleeve and a corrugated pipe of the coupling are damaged even when serious, the dismounting device cannot be remounted on the motor shaft, and the operation of the rail transit vehicle is directly influenced by the replacement work through replacing the new coupling and the motor shaft, so that larger economic loss is caused. It should be noted that, because of the existence of the key and the key groove, the coupling with the structure can not adopt the disassembly mode of injecting the high-pressure oil into the oil filling hole, and is inconvenient for operators to disassemble.

In the research and development process of rail transit vehicle manufacturers, the problem of disassembling the crowned tooth type coupling with the structure is still to be solved.

Disclosure of Invention

The utility model aims to solve the technical problem that when an operator dismounts the drum-type tooth-type coupling in an assembly mode that an inner taper hole and a shaft are in interference fit with each other by a conical surface and are keyed, the drum-type tooth-type coupling dismounting device which is convenient to dismount and prevents parts from being damaged can be provided.

In order to solve the technical problems, the utility model provides the following technical scheme: a drum-type tooth-type coupling dismounting device for dismounting a coupling mounted on a motor shaft, the drum-type tooth-type coupling dismounting device comprising:

the fixing component is fixed with the motor shaft during the disassembling operation;

the movable assembly is fixed with the shaft coupling during the disassembly operation, and the movable assembly and the fixed assembly are positioned on the same axis and can move relative to the fixed assembly;

the driving piece is arranged on the fixed assembly and is used for driving the movable assembly and the coupling to move relative to the fixed assembly at the same time.

Compared with the prior art, the utility model has the following beneficial effects: the movable component and the fixed component are positioned on the same axis, so that the centering and positioning precision of the dismounting device relative to the motor shaft can be ensured after the dismounting device is mounted relative to the motor shaft, and the motor shaft and the coupling are effectively protected from being damaged in the dismounting process; the driver is controlled to dismantlement personnel to operate, and the driver can drive movable assembly and shaft coupling and remove relatively fixed subassembly simultaneously, and then realizes the separation of shaft coupling relative motor shaft, controls simply, dismantles conveniently.

Preferably, the fixing assembly comprises a central fixing block and a central screw rod, one end of the central fixing block is fixedly arranged on the anti-loosening fixing part of the motor shaft, the other end of the central fixing block is fixed with the central screw rod, and the motor shaft, the central fixing block and the central screw rod are positioned on the same axial lead.

Preferably, one end of the central fixing block is provided with an internal thread, the anti-loosening fixing part is provided with an external thread, and the central fixing block is fixedly connected with the anti-loosening fixing part through threads; the other end of the central fixed block is provided with an internal thread which is matched with and fixedly connected with the external thread of the central screw rod.

Preferably, the outer diameter of the central fixing block is smaller than the inner diameter of the coupling.

Preferably, the movable assembly comprises a first flange and a second flange, the first flange is fixed with the coupling, the second flange is installed on the first flange through a fastener, and the first flange, the second flange, the motor shaft, the central fixing block and the central screw are located on the same axis.

Preferably, the first flange comprises a first fixing portion and a second fixing portion which are arranged in the axial direction, the first fixing portion of the first flange is fixedly installed on the end face of the coupling through an inner hexagonal bolt, the inner diameter of the first fixing portion is smaller than that of the second fixing portion, the inner hexagonal bolt is located at a stage position of an inner diameter difference between the first fixing portion and the second fixing portion, and the second fixing portion of the first flange is fixedly connected with the second flange through a bolt and nut assembly.

Preferably, the driving piece is a hydraulic jack, the hydraulic jack is connected with a hydraulic oil pump arranged outside, the hydraulic jack comprises a cylinder body and a piston rod, the piston rod is axially hollow, the hydraulic jack is sleeved on the central screw and is in sliding fit with the central screw, the piston rod is arranged towards the central fixing block, reverse thrust can be generated and the cylinder body is pushed to move reversely when the piston rod is propped against the central fixing block, and the cylinder body is fixed with the second flange.

Preferably, the cylinder body is provided with an external thread corresponding to the outer circle of one end of the piston rod, and the second flange is provided with an internal thread matched with the external thread and fixedly connected with the external thread.

Preferably, the end surface of the central fixing block, which is close to the hydraulic jack, protrudes from the end surface of the first fixing part, which is close to the hydraulic jack.

Preferably, a limiting part is arranged at one end, far away from the central fixing block, of the central screw rod, and the ratio between the distance D1 between the limiting part and the hydraulic jack and the thickness dimension D2 of the coupling is 5:1- -4:1.

in order that the above-recited features and effects of the present utility model can be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

Drawings

FIG. 1 is a schematic view of an assembly of a drum type tooth coupling and a motor shaft of the present utility model;

FIG. 2 is a schematic view of the structure of the drum-type tooth-coupling dismounting device of the utility model;

fig. 3 is a schematic view showing a disassembled state in which the drum-type tooth-type coupling disassembling device of the present utility model is mounted on a motor shaft to perform coupling disassembling operation.

In the figure: 10-motor shaft, 11-coupling, 12-gear box, 13-locking fixed part, 14-locknut, 20-fixed component, 21-center fixed block, 22-center screw, 30-movable component, 31-first flange, 311-first fixed part, 312-second fixed part, 32-second flange, 40-driving piece, 41-cylinder body, 42-piston rod, 50-limiting piece and 60-hydraulic oil pump.

Detailed Description

The following detailed description of the utility model is, therefore, not to be taken in a limiting sense, and is set forth in the appended drawings. The terms "front," "rear," "left," "right," "upper," "lower," and the like refer to an orientation or positional relationship based on that shown in the corresponding drawings, for convenience of description and simplicity of description, and do not necessarily indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. The terms "first," "second," and "third" are used merely to simplify the written description to distinguish similar objects from similar objects and are not to be construed as precedence relationships between a particular sequence. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "fixed," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be directly connected or indirectly connected through an intermediate medium. The corresponding meanings of the above terms in the present utility model will be understood by those skilled in the art according to the specific circumstances.

The following describes a drum-type tooth-type coupling dismounting device according to an embodiment of the present utility model in detail with reference to the drawings.

Referring to fig. 1, fig. 1 shows an assembly structure of a drum-type tooth-shaped coupling and a motor shaft 10 in the prior art, the motor shaft 10 is mounted on a gear box 12, the coupling 11 is mounted at an output end of the motor shaft 10, the output end of the motor shaft 10 is in a frustum shape, and the coupling 11 is provided with an inner taper hole adapted to the frustum shape. The output end of the motor shaft 10 is provided with a key slot, the coupling 11 and the motor shaft 10 are assembled in a conical surface interference fit and keyed assembly mode, and the coupling 11 and the motor shaft 10 are positioned on the same axis. The output end of the motor shaft 10 protrudes outwards to form a locking fixing part 13, the locking fixing part 13 is provided with external threads for being matched with a locking nut 14, the locking nut 14 can prevent the coupling 11 from accidentally falling off the motor shaft 10 when the motor shaft 10 rotates at a high speed, and the running safety of rail transit vehicles is improved. In this embodiment, when the coupling 11 mounted on the motor shaft 10 is removed, the lock nut 14 is first removed from the motor shaft 10, and then the drum-type tooth coupling removing device is mounted on the motor shaft 10 to perform the coupling removing operation.

Referring to fig. 2 and 3, an embodiment of the present utility model provides a drum-type tooth-type coupling dismounting device, which is used for dismounting a drum-type tooth-type coupling with an inner taper hole and a shaft adopting a conical surface interference fit and a keyed assembly structure. This drum type tooth-shaped coupling dismounting device includes: the stationary assembly 20, the movable assembly 30 and the driving member 40. When the dismounting device is used for dismounting the shaft coupling, the fixed component 20 is fixed with the motor shaft 10, the movable component 30 is fixed with the shaft coupling 11, and the movable component 30 moves relative to the fixed component 20 to drive the shaft coupling 11 to separate relative to the motor shaft 10, so that the dismounting purpose is realized. Wherein: the movable assembly 30 and the fixed assembly 20 are positioned on the same axis, so that the centering positioning precision of the dismounting device relative to the motor shaft 10 can be ensured, and the motor shaft 10 and the coupling 11 are effectively protected from being damaged in the dismounting process. The driving piece 40 is arranged on the fixed component 20, and a disassembling person controls the driving piece 40 to operate, so that the driving piece 40 drives the movable component 30 and the coupling 11 to move relative to the fixed component 20 at the same time, and the coupling 11 is separated relative to the motor shaft 10. The dismounting device can ensure the centering and positioning of the dismounting device after the mounting of the dismounting device relative to the motor shaft 10 is completed, and the dismounting device is simple to operate and control and convenient to dismount.

In this embodiment, the fixing assembly 20 includes a center fixing block 21 and a center screw 22. The center fixing block 21 and the center screw 22 may be integrally formed. When the operator performs the coupling disassembly operation, the center fixing block 21 is fixedly installed on the anti-loosening fixing portion 13 of the motor shaft 10, so that the disassembly device is conveniently positioned and the disassembly operation is performed. The center fixed block 21 is provided with an internal thread at one end close to the motor shaft 10, the anti-loose fixed part 13 is provided with an external thread, and the center fixed block 21 is fixedly connected with the anti-loose fixed part 13 through threads. The other end of the central fixed block 21 far away from the motor shaft 10 is fixed with a central screw rod 22, and the other end of the central fixed block 21 is provided with internal threads which are matched with and fixedly connected with external threads of the central screw rod 22. The motor shaft 10, the central fixing block 21 and the central screw 22 are positioned on the same axial lead so as to ensure that the dismounting device is aligned relative to the center of the motor shaft 10 during mounting. The center screw 22 extends to one side and has a guiding function, and the movable assembly 30 moves along the arrangement direction of the center screw 22 when moving relative to the fixed assembly 20. The outer diameter of the center fixing block 21 is smaller than the inner diameter of the coupling 11, and when the coupling 11 is separated from the motor shaft 10 by an external force, the movement of the coupling 11 is not affected. The outer surface of the other end of the center fixing block 21, which is far away from the motor shaft 10, is arranged into a hexagonal plane, so that a disassembly person can conveniently install the center fixing block 21 on the motor shaft 10 by using a wrench.

In this embodiment, the movable assembly 30 includes a first flange 31 and a second flange 32. When an operator performs the coupling disassembly operation, the first flange 31 is fixedly mounted on the coupling 11, so that the first flange 31 is fixed with the coupling 11, and the second flange 32 is mounted on the first flange 31 by a fastener. The first flange 31, the second flange 32, the motor shaft 10, the central fixing block 21 and the central screw 22 are positioned on the same axial lead, so that the first flange 31 and the second flange 32 can be aligned with the center of the motor shaft 10 relative to the coupling 11, and other parts of the coupling 11 are prevented from being damaged in the disassembly process. In other embodiments, the first flange 31 and the second flange 32 may be integrally formed.

Specifically, the first flange 31 includes a first fixing portion 311 and a second fixing portion 312 arranged in the axial direction. The first fixing portion 311 of the first flange 31 is fixedly installed on the end surface of the coupling 11 by socket head cap bolts to improve the positioning accuracy of the dismounting device. The first fixing portion 311 is provided with a through hole adapted to the socket head cap screw, and the end portion of the coupling 11 is provided with an internal screw hole adapted to the socket head cap screw. The inner diameter of the first fixing portion 311 is smaller than that of the second fixing portion 312, the socket head cap screw is located at a stepped portion of the inner diameter difference between the first fixing portion 311 and the second fixing portion 312, and a disassembling person fixes the socket head cap screw to an end portion of the coupling 11 by using a screwdriver. The step part is provided with a countersunk head screw hole for assembling the inner hexagon bolt, and the end face of the inner hexagon bolt is lower than the surface of the step part after the inner hexagon bolt is assembled. The inner diameter of the first fixing portion 311 is larger than the outer diameter of the center fixing block 21 to prevent mutual interference, and the center fixing block 21 of the convenient dismounting device is mounted to the motor shaft 10. The second flange 32 is fixedly connected to the second fixing portion 312 of the first flange 31 by a bolt-nut assembly.

In this embodiment, the driving member 40 is a hydraulic jack. The hydraulic jack comprises a cylinder 41 and a piston rod 42. The piston rod 42 is axially hollow, and the hydraulic jack is sleeved on the central screw rod 22 through the piston rod 42 and is in sliding fit with the central screw rod 22. The piston rod 42 is disposed toward the center fixed block 21, and a reaction force can be generated when the piston rod 42 abuts against the center fixed block 21. The cylinder 41 is fixed with the second flange 32, and the reaction force pushes the cylinder 41 to move reversely and can drive the second flange 32 and the first flange 31 to move at the same time, so that the coupling 11 is separated relative to the motor shaft 10.

Wherein: in designing the hydraulic jack, in order to enable the piston rod 42 to generate a larger thrust force, the developer often chooses to increase the diameter of the piston rod 42, while in this embodiment, the diameter of the piston rod 42 is increased, and meanwhile, it is considered whether the inner diameter dimension of the first fixing portion 311 of the first flange 31 interferes with the outer diameter of the piston rod 42, or the piston rod 42 is easily contacted with the first fixing portion 311 to affect disassembly. The developer chooses to increase the diameter of the piston rod 42 while keeping the piston rod 42 from contacting the first flange 31, so that the end surface of the central fixing block 21 close to the hydraulic jack protrudes from the end surface of the first fixing portion 311 close to the hydraulic jack, and the piston rod 42 is preferentially contacted with the central fixing block 21 when moving towards the motor shaft 10.

Specifically, the hydraulic jack is connected with the hydraulic oil pump 60 arranged outside, the disassembling personnel start the hydraulic oil pump 60, when the piston rod 42 gradually extends out of the cylinder 41 and moves towards the center fixing block 21, the piston rod is propped against the center fixing block 21, reverse thrust is further generated, the cylinder 41 is pushed to be far away from the motor shaft 10, at the moment, the cylinder 41 drives the second flange 32, the first flange 31 and the coupling 11 to synchronously move, the coupling 11 is further separated relative to the motor shaft 10, and the disassembling purpose of the coupling 11 is achieved.

The cylinder 41 is provided with an external thread corresponding to an outer circumference of one end of the piston rod 42, and the second flange 32 is provided with an internal thread matched with the external thread and fixedly connected, so that the cylinder 41 is fixed with the second flange 32. Of course, in other embodiments, the hydraulic jack can be fixedly installed on the central screw rod, at this time, the second flange is fixed with the piston rod, and the second flange, the first flange and the coupling are directly driven to move relative to the motor shaft through the piston rod, so that the purpose of dismounting the coupling is achieved.

It should be noted that: the spring is arranged in the drum-shaped tooth-shaped coupling with the existing structure, when the coupling 11 is separated relative to the motor shaft 10, the coupling 11 can be ejected at the moment of separation, the movable assembly 30 and the hydraulic jack can be pushed to move, and in order to avoid damage of the coupling 11 and the hydraulic jack caused by ejection, a limiting piece 50 is arranged at one end, far away from the center fixed block 21, of the center screw 22. The limiting member 50 can prevent the coupling 11, the movable assembly 30 and the hydraulic jack from falling off from the dismounting device and protect the hydraulic jack from damage. The ratio between the spacing D1 between the limiting member 50 and the hydraulic jack and the thickness dimension D2 of the coupling 11 is 5:1- -4:1 to optimize the structural design of the dismounting device. If the interval between the limiting piece 50 and the hydraulic jack is too short, the limiting piece 50 needs to bear larger elastic impact force, so that the structural strength of the limiting piece 50 is affected, and structural damage can be caused to the hydraulic jack; if the spacing between the limiting member 50 and the hydraulic jack is too long, the size and structure of the dismounting device can be increased, and the purpose of arranging the limiting member 50 can be reduced.

In this embodiment, the stopper 50 is a stop nut. The stop nut is in threaded connection with the central screw rod 22, a rubber pad is arranged on the end face of the stop nut, opposite to the hydraulic jack, and the rubber pad can buffer elastic impact force and further protect the hydraulic jack from being damaged. In this embodiment, the stop nut is spaced from the hydraulic jack by 10 mm-15 mm.

In this embodiment, when an operator performs a disassembling operation through the drum-type tooth-type coupling disassembling device, specific disassembling steps are as follows:

step one: the locknut 14 is detached from the lockfixing portion 13 of the motor shaft 10, and then the center fixing block 21 is mounted on the lockfixing portion 13 of the motor shaft 10;

step two: the first flange 31 is mounted at the end of the coupling 11 by socket head cap bolts;

step three: a center screw 22 is mounted on the center fixing block 21;

step four: fixing the second flange 32 to the cylinder 41 of the hydraulic jack;

step five: sleeving the hydraulic jack on the central screw 22, and fixing the first flange 31 and the second flange 32 through a bolt-nut assembly;

step six: mounting a stop nut on the central screw 22 at a distance of 12mm from the hydraulic jack;

step seven: the hydraulic jack is connected with the hydraulic oil pump 60, the hydraulic oil pump 60 is started, the piston rod 42 moves towards the central fixed block 21 after being subjected to hydraulic pressure and is propped against the central fixed block 21, reverse thrust is correspondingly generated, the cylinder 41 is pushed to move in the opposite direction, the cylinder 41 drives the second flange 32, the first flange 31 and the coupling 11 to synchronously move, and the coupling 11 is separated relative to the motor shaft 10, so that the coupling 11 is detached.

Finally, it should be noted that: the above embodiments are only for illustrating the present utility model and not for limiting the technical solution described in the present utility model; thus, although the present utility model has been described in detail with reference to the above embodiments, it will be understood by those skilled in the art that the present utility model may be modified or equivalent; all technical solutions and modifications thereof that do not depart from the spirit and scope of the present utility model are intended to be included in the scope of the appended claims.

Claims

1. A drum-type tooth-type coupling dismounting device for dismounting a coupling (11) mounted on a motor shaft (10), characterized in that the drum-type tooth-type coupling dismounting device comprises:

a fixing component (20), wherein the fixing component (20) is fixed with the motor shaft (10) during the disassembling operation;

the movable assembly (30) is fixed with the shaft coupling (11) during the disassembly operation, and the movable assembly (30) and the fixed assembly (20) are positioned on the same axis and can move relative to the fixed assembly (20);

the driving piece (40) is arranged on the fixed assembly (20) and used for driving the movable assembly (30) and the coupling (11) to move relative to the fixed assembly (20) at the same time.

2. Drum tooth-type coupling dismounting device as claimed in claim 1, characterized in that the fixing assembly (20) comprises a central fixing block (21) and a central screw (22), one end of the central fixing block (21) is fixedly mounted on the anti-loosening fixing portion (13) of the motor shaft (10), the other end of the central fixing block (21) is fixed with the central screw (22), and the motor shaft (10), the central fixing block (21) and the central screw (22) are located on the same axial lead.

3. Drum-type tooth-type coupling dismounting device as claimed in claim 2, characterized in that one end of the center fixing block (21) is provided with an internal thread, the anti-loosening fixing part (13) is provided with an external thread, and the center fixing block (21) is fixedly connected with the anti-loosening fixing part (13) through threads;

the other end of the central fixed block (21) is provided with an internal thread which is matched with and fixedly connected with an external thread of the central screw rod (22).

4. A drum tooth coupling dismounting device as claimed in claim 3, characterized in that the outer diameter of the center fixing block (21) is smaller than the inner diameter of the coupling (11).

5. Drum tooth coupling dismounting device as claimed in claim 2, characterized in that the movable assembly (30) comprises a first flange (31) and a second flange (32), the first flange (31) is fixed to the coupling (11), the second flange (32) is mounted on the first flange (31) by means of a fastening piece, and the first flange (31), the second flange (32), the motor shaft (10), the central fixing block (21) and the central screw (22) are located on the same axis.

6. Drum-type tooth-coupling dismounting device as claimed in claim 5, characterized in that the first flange (31) comprises a first fixing portion (311) and a second fixing portion (312) which are arranged in the axial direction, the first fixing portion (311) of the first flange (31) is fixedly mounted on the end face of the coupling (11) through an inner hexagonal bolt, the inner diameter of the first fixing portion (311) is smaller than the inner diameter of the second fixing portion (312), the inner hexagonal bolt is located at a step part of the inner diameter difference between the first fixing portion (311) and the second fixing portion (312), and the second fixing portion (312) of the first flange (31) is fixedly connected with the second flange (32) through a bolt-nut assembly.

7. Drum tooth coupling dismounting device as claimed in claim 6, characterized in that the driving member (40) is a hydraulic jack which is connected with a hydraulic oil pump (60) arranged outside, the hydraulic jack comprises a cylinder body (41) and a piston rod (42), the piston rod (42) is arranged axially hollow, the hydraulic jack is sleeved on the central screw (22) and is in sliding fit with the central screw (22), the piston rod (42) is arranged towards the central fixing block (21), and when the piston rod (42) is pressed against the central fixing block (21), a reverse thrust can be generated and the cylinder body (41) is pushed to move reversely, and the cylinder body (41) is fixed with the second flange (32).

8. Drum tooth coupling dismounting device as claimed in claim 7, characterized in that the cylinder (41) is provided with an external thread on the outer circumference of the end corresponding to the piston rod (42), and that the second flange (32) is provided with an internal thread cooperating with the external thread and is fixedly connected.

9. Drum tooth coupling dismounting device as claimed in claim 7, characterized in that the end face of the central fixing block (21) close to the hydraulic jack protrudes from the first fixing portion (311) close to the end face of the hydraulic jack.

10. Drum-type tooth-coupling dismounting device as claimed in claim 7, characterized in that the end of the central screw (22) remote from the central fixed block (21) is provided with a limiting piece (50), the ratio between the spacing D1 of the limiting piece (50) and the hydraulic jack and the thickness dimension D2 of the coupling (11) is 5:1- -4:1.