CN114044460A - Building lifts by crane electric hoist toper arresting gear - Google Patents

Abstract

The invention relates to the field of building hoisting equipment, and discloses a conical braking device for a building hoisting electric hoist, which comprises a shell and a motor shaft of the electric hoist, wherein one end of the motor shaft extends into the shell and is fixedly connected with a brake wheel, the middle part of an inner cavity of the shell is provided with a brake ring, the motor shaft is provided with a brake spring, the brake ring is rotatably sleeved with the shell, and the outer side of the shell is provided with a clamping mechanism for limiting the brake ring. Through the structural design of the brake ring linkage positioning plate, the turntable, the crank-link mechanism, the linkage shaft, the piston sliding plate, the annular oil pipe, the clamping mechanism and the oil control device for braking the brake wheel in the shell, under the premise of not influencing the normal braking of the brake device, when an electrical fault or power grid power failure and other emergency situations occur, the oil control device far away from the shell is controlled manually, a heavy object suspended after braking in the emergency situation can be released slowly, and the safety performance of the electric hoist after braking in the tight situation is improved.

Description

Building lifts by crane electric hoist toper arresting gear

Technical Field

The invention relates to the field of building hoisting equipment, in particular to a conical braking device for a building hoisting electric hoist.

Background

Electric block is the equipment of lifting by crane commonly used in the building engineering, and electric block is lifting by crane the work in, need arresting gear to brake, current electric block arresting gear is mostly the toper stopper, motor shaft suit toper stator and rotor through electric block, when the circuit switch-on, when making the motor shaft rotatory, still do axial displacement, thereby overcome the elasticity of spring, make the braked wheel and the brake ring separation of motor shaft one end, and when electric block stopped, the outage back, under the elastic force effect of spring, make the motor shaft carry out reverse axial displacement, braked wheel and brake ring contact friction brake.

However, when the existing electric hoist conical braking device is used, in an emergency situation such as an electrical fault or power grid power failure, the brake is in a braking state, the brake cannot be operated to open and release a heavy object, the heavy object can only be suspended in the air, and the heavy object needs to be maintained with load, so that great potential safety hazard exists, and therefore, the building hoisting electric hoist conical braking device is provided.

Disclosure of Invention

The invention provides a conical braking device for a building hoisting electric hoist, which has the advantage of safely releasing heavy objects in case of failure and solves the technical problems in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme to realize: a conical braking device of an electric hoist for lifting a building comprises a shell and a motor shaft of the electric hoist, wherein one end of the motor shaft extends into the shell and is fixedly connected with a brake wheel, the middle part of an inner cavity of the shell is provided with a brake ring, a brake spring is arranged on the motor shaft, the brake ring is rotatably sleeved with the shell, the outer side of the shell is provided with a clamping mechanism for limiting the brake ring, one side of the brake ring, far away from the brake wheel, is fixedly connected with a positioning plate, the middle part of the positioning plate, far away from one side of the brake wheel, is fixedly connected with a turntable, one side of the turntable, far away from the positioning plate, is provided with a crank-link mechanism, one side of the crank-link mechanism, far away from the turntable, is rotatably sleeved with a linkage shaft capable of longitudinally moving, the top of the shell is fixedly connected with a vertical pipe positioned above the linkage shaft, the top end of the linkage shaft extends into the vertical pipe and is fixedly connected with a piston sliding plate, and the piston sliding plate is provided with a damping hole, the outside of universal driving shaft and the top movable seal of casing, and be full of hydraulic oil in the standpipe, the fixed cover in middle part in the casing outside is equipped with the annular oil pipe that is located standpipe one side, and after annular oil pipe's inner chamber was full of hydraulic oil, screens mechanism cancellation was injectd the rotation of brake ring, and one side switch-on of annular oil pipe bottom has defeated oil pipe, and defeated oil pipe keeps away from annular oil pipe's one end switch-on and has accuse oily device.

Optionally, the quantity of screens mechanism is four, screens mechanism includes the registration arm of fixed mounting on annular oil pipe, and the inner chamber of registration arm communicates with each other with annular oil pipe's inner chamber, the inside movable sleeve of registration arm is equipped with by the movable plate, be equipped with the screens spring between the inner wall of driven plate and registration arm, one side fixedly connected with card axle that the screens spring was kept away from to the movable plate, the one end of card axle extend to the inside of casing and with the outside swing joint of brake ring.

Optionally, the oil control device includes the main oil pipe of putting through with defeated oil pipe, and the fixed cover in one side that defeated oil pipe was kept away from to main oil pipe is equipped with sealed swivel nut, and the middle part screw thread cover of sealed swivel nut is equipped with the screw rod, and the one end bearing cover of screw rod is equipped with the pressure oil piston that is located the inside of main oil pipe, presses the outside of oil piston and the movable laminating of inner wall of main oil pipe, and the one side that the screw rod was kept away from to the pressure oil piston in the main oil pipe is full of hydraulic oil, and the other end fixedly connected with of screw rod is located the outside helm of main oil pipe.

Optionally, a limiting plate is fixedly sleeved on one side inside the casing, an annular compensating pipe located on one side of the limiting plate is fixedly sleeved in the casing, the side surface of the annular compensating pipe is hermetically connected with the side surface of the limiting plate, the inner side of the limiting plate is movably sleeved with the outer side of the motor shaft, a piston sliding ring is movably sleeved in the annular compensating pipe, the top and the bottom of the side surface of the piston sliding ring are respectively and fixedly connected with a push shaft, one end of the push shaft, far away from the piston sliding ring, extends out of the annular compensating pipe and is fixedly connected with a push plate, one side of the brake wheel, far away from the brake ring, is in bearing connection with the limiting plate, the limiting plate is movably sleeved on the outer side of the motor shaft, the brake spring is arranged between the push plate and the limiting plate, an oil guide pipe is communicated between the inner cavity of the annular compensating pipe and the inner cavity of the oil pipe, and the oil guide pipe is provided with a spring type one-way valve, and the opening elasticity of the spring type one-way valve is larger than the elasticity of the clamping spring.

Optionally, the fixed cover in the casing is equipped with the spacing ring that is located locating plate one side, the spacing ring is located the outside of carousel, and the spacing ring does not contact with crank link mechanism, is equipped with the end face bearing between spacing ring and the locating plate.

The invention provides a conical braking device for a building hoisting electric hoist, which has the following beneficial effects:

1. according to the conical braking device for the electric hoist lifted by the building, through the structural design of the braking ring linkage positioning plate, the rotary disc, the crank connecting rod mechanism, the linkage shaft, the piston sliding plate, the annular oil pipe, the clamping mechanism and the oil control device for braking the braking wheel in the shell, on the premise that the normal braking of the braking device is not influenced, when an electric fault or power grid power failure and other emergency situations occur, the braking device of the electric hoist is still in a braking state, the oil control device far away from the shell is controlled manually, so that the motor shaft and the braking wheel can rotate at a constant speed along with the braking ring, the positioning plate and the rotary disc, a heavy object suspended after braking in an emergency situation is released at a slow speed, the situation that the heavy object can only be suspended in the air and must be maintained with a load is avoided, the problem of great potential safety hazard exists, and the safety performance of the electric hoist after braking is tightly achieved is improved.

2. This building electric hoist conical brake device that lifts by crane, through linkage annular oil pipe, the annular compensating pipe of accuse oil device, the piston sliding ring, the structural design of push pedal, through the further increase of control annular oil pipe inner chamber pressure, thereby make the spring check valve open, hydraulic oil gets into in the annular compensating pipe, promote the piston sliding ring, push away the axle, the whole relative limiting plate of push pedal moves to the right, and when cancelling, the spring check valve is closed, hydraulic oil in the annular compensating pipe can not flow back, so that after the long-term wearing and tearing of one side that the brake wheel contacted the brake ring consume, carry out the simultaneous compensation to the wearing and tearing consumption of brake wheel and brake spring's elastic fatigue, improve the long-term high-efficient life who brakies of electric hoist brake device.

Drawings

FIG. 1 is a sectional view of the middle of the housing of the conical braking device of the present invention;

FIG. 2 is a schematic side sectional view taken along line a-a of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic view of the construction of the conical brake apparatus of the present invention;

FIG. 4 is a schematic view of the locking mechanism of FIG. 1 according to the present invention;

FIG. 5 is a schematic structural diagram of the oil control device shown in FIG. 3 according to the present invention.

In the figure: 1. a housing; 2. a motor shaft; 3. a brake wheel; 4. a brake ring; 5. a brake spring; 6. positioning a plate; 7. a turntable; 8. a crank link mechanism; 9. a linkage shaft; 10. a vertical tube; 11. a piston slide plate; 12. a limiting ring; 13. an annular oil pipe; 14. a clamping mechanism; 141. a positioning tube; 142. a passive plate; 143. a clamping spring; 144. clamping a shaft; 15. an oil guide pipe; 16. a spring-type check valve; 17. a limiting plate; 18. an annular compensating pipe; 19. a piston slip ring; 20. pushing the shaft; 21. pushing the plate; 22. a limiting plate; 23. an oil delivery pipe; 24. an oil control device; 241. a main oil pipe; 242. sealing the threaded sleeve; 243. a screw; 244. and pressing the oil piston.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a conical brake device of an electric hoist for hoisting a building comprises a housing 1 and a motor shaft 2 of the electric hoist, wherein one end of the motor shaft 2 extends into the housing 1 and is fixedly connected with a brake wheel 3, a brake ring 4 is arranged in the middle of an inner cavity of the housing 1, the outer side of the brake wheel 3 is movably connected with the inner side of the brake ring 4, a brake spring 5 is arranged on the motor shaft 2, the brake wheel 3 is attached to the brake ring 4 for braking by the elastic force of the brake spring 5 in a standby state of the electric hoist, when the electric hoist is started, the motor shaft 2 drives the brake wheel 3 to move left to be separated from the brake ring 4, the brake ring 4 is rotatably sleeved with the housing 1, a clamping mechanism 14 for limiting the brake ring 4 is arranged on the outer side of the housing 1, a positioning plate 6 is fixedly connected to one side of the brake ring 4 far away from the brake wheel 3, a turntable 7 is fixedly connected to the middle of the positioning plate 6 far away from one side of the brake wheel 3, a crank link mechanism 8 is arranged on one side of the turntable 7 far away from the positioning plate 6, referring to fig. 2, a linkage shaft 9 capable of moving longitudinally is rotatably sleeved on one side of the crank link mechanism 8 far away from the turntable 7, a vertical pipe 10 positioned above the linkage shaft 9 is fixedly connected to the top of the shell 1, the top end of the linkage shaft 9 extends into the vertical pipe 10 and is fixedly connected with a piston sliding plate 11, a damping hole is formed in the piston sliding plate 11, the outer side of the linkage shaft 9 is movably sealed with the top of the shell 1, the vertical pipe 10 is filled with hydraulic oil, an annular oil pipe 13 positioned on one side of the vertical pipe 10 is fixedly sleeved at the middle part of the outer side of the shell 1, the number of the clamping mechanisms 14 is four, the four clamping mechanisms 14 are fixedly installed on the outer side of the annular oil pipe 13, after the inner cavity of the annular oil pipe 13 is filled with hydraulic oil, the clamping mechanisms 14 cancel the rotation limitation to the brake ring 4, an oil pipe 23 is communicated with one side of the bottom of the annular oil pipe 13, referring to fig. 3, an end of the oil delivery pipe 23 away from the annular oil pipe 13 is connected to an oil control device 24.

Specifically, referring to fig. 4, the locking mechanism 14 includes a positioning tube 141 fixedly installed on the annular oil tube 13, an inner cavity of the positioning tube 141 is communicated with an inner cavity of the annular oil tube 13, a driven plate 142 is movably sleeved inside the positioning tube 141, a locking spring 143 is disposed between the driven plate 142 and an inner wall of the positioning tube 141, a locking shaft 144 is fixedly connected to one side of the driven plate 142 away from the locking spring 143, and one end of the locking shaft 144 extends into the housing 1 and is movably connected to an outer side of the brake ring 4.

Referring to fig. 5, the oil control device 24 includes a main oil pipe 241 communicated with the oil pipe 23, a sealing threaded sleeve 242 is fixedly sleeved on one side of the main oil pipe 241 far away from the oil pipe 23, a screw 243 is sleeved on a middle thread of the sealing threaded sleeve 242, a pressure oil piston 244 located inside the main oil pipe 241 is sleeved on one end of the screw 243 through a bearing, an outer side of the pressure oil piston 244 is movably attached to an inner wall of the main oil pipe 241, one side of the pressure oil piston 244 far away from the screw 243 in the main oil pipe 241 is filled with hydraulic oil, and a steering wheel located outside the main oil pipe 241 is fixedly connected to the other end of the screw 243.

When the electric hoist is normally braked, the brake wheel 3 is in contact with the brake ring 4 under the action of the elastic force of the brake spring 5 after the electric hoist is powered off, the brake state of the electric hoist is maintained, when the brake device of the electric hoist is still in the brake state under emergency conditions such as electrical failure or power grid power failure, the screw 243 is manually rotated to enable the oil pressing piston 244 to move rightwards, after the oil pressure in the annular oil pipe 13 is increased, the oil pressure enables the driven plate 142 to drive the clamping shaft 144 to move away from the brake ring 4 until the clamping shaft 144 is separated from the brake ring 4, when a heavy object is hung on the electric hoist, the motor shaft 2 can drive the brake wheel 3 and the brake ring 4 to integrally rotate reversely under the action of the gravity of the heavy object, the heavy object is released, and meanwhile, the positioning plate 6, the turntable 7, the brake ring 4 and the brake wheel 3 rotate together, under the linkage of the crank link mechanism 8, the linkage shaft 9 pulls the piston slide plate 11 to reciprocate up and down in the vertical pipe 10, so that the damping effect that hydraulic oil in the vertical pipe 10 flows through damping holes in the piston slide plate 11 is utilized, the up-and-down reciprocating movement of the piston slide plate 11 is limited in speed, the rotary table 7, the positioning plate 6, the brake ring 4, the brake wheel 3 and the motor shaft 2 slowly rotate at a constant speed, and the electric hoist is enabled to slowly release heavy objects.

A limiting plate 17 is fixedly sleeved on one side inside the shell 1, an annular compensating pipe 18 positioned on one side of the limiting plate 17 is fixedly sleeved in the shell 1, the side surface of the annular compensating pipe 18 is hermetically connected with the side surface of the limiting plate 17, the inner side of the limiting plate 17 is movably sleeved with the outer side of the motor shaft 2, a piston sliding ring 19 is movably sleeved in the annular compensating pipe 18, the top and the bottom of the side surface of the piston sliding ring 19 are respectively and fixedly connected with a push shaft 20, one end of the push shaft 20 far away from the piston sliding ring 19 extends out of the outer side of the annular compensating pipe 18 and is fixedly connected with a push plate 21, one side of the brake wheel 3 far away from the brake ring 4 is in bearing connection with a limiting plate 22, the limiting plate 22 is movably sleeved on the outer side of the motor shaft 2, a brake spring 5 is arranged between the push plate 21 and the limiting plate 22, an oil pipe 15 is communicated between the inner cavity of the annular compensating pipe 18 and the inner cavity of the oil pipe 23, a spring-type one-way valve 16 is arranged on the oil pipe 15, and the opening elastic force of the spring type check valve 16 is larger than the elastic force of the retaining spring 143.

When the oil injection and pressurization control clamping shaft 144 is injected into the annular oil pipe 13 and moves away from the brake ring 4 by overcoming the elastic force of the clamping spring 143, the spring type one-way valve 16 is in a closed state, the pressure oil piston 244 moves to the right by further rotating the screw 243, so that the pressure in the inner cavity of the annular oil pipe 13 is further increased, the spring type one-way valve 16 is opened, the hydraulic oil enters the annular compensation pipe 18, the piston sliding ring 19, the push shaft 20 and the push plate 21 are pushed to the right by integrally moving relative to the limiting plate 22, and when the pressure is cancelled, the spring type one-way valve 16 is closed, the hydraulic oil in the annular compensation pipe 18 cannot flow back, so that after the brake wheel 3 is in contact with one side of the brake ring 4 for long-term abrasion consumption, the abrasion consumption of the brake wheel 3 and the elastic fatigue of the brake spring 5 are simultaneously compensated, and the service life of the electric hoist brake device for long-term high-efficiency braking is prolonged.

The limiting ring 12 positioned on one side of the positioning plate 6 is fixedly sleeved in the shell 1, the limiting ring 12 is positioned on the outer side of the rotary disc 7, the limiting ring 12 is not in contact with the crank connecting rod mechanism 8, the end face bearing is arranged between the limiting ring 12 and the positioning plate 6, the positioning plate 6 is limited by the limiting ring 12 and the end face bearing, the brake ring 4 and the positioning plate 6 are prevented from moving rightwards under the elastic force of the brake spring 5 integrally, and the brake ring 6 and the brake ring 4 are not influenced to rotate along with the brake wheel 3 when releasing heavy objects after braking.

When the electric hoist is used, when the electric hoist is started, the motor shaft 2 drives the brake wheel 3 to move left and separate from the brake ring 4, when the electric hoist stops lifting and braking, the motor shaft 2 drives the brake wheel 3 to move right under the action of the elastic force of the brake spring 5 to be in contact friction with the brake ring 4 for braking until the motor shaft 2 stops rotating, when the braking device of the electric hoist is still in a braking state under emergency conditions such as electrical failure or power grid power failure, the screw 243 is rotated to enable the oil pressing piston 244 to move right, after the oil pressure in the annular oil pipe 13 is increased, the oil pressure enables the driven plate 142 to drive the clamping shaft 144 to move away from the brake ring 4 until the clamping shaft 144 separates from the brake ring 4, when a heavy object is hung on the electric hoist, the gravity of the heavy object enables the motor shaft 2 to drive the brake wheel 3 and the brake ring 4 to rotate reversely integrally to release the heavy object, and meanwhile, the positioning plate 6 and the turntable 7 can drive the brake ring 4, The brake wheel 3 rotates together, under the linkage of the crank link mechanism 8, the linkage shaft 9 pulls the piston slide plate 11 to reciprocate up and down in the vertical pipe 10, so that the damping effect of hydraulic oil in the vertical pipe 10 flowing through a damping hole on the piston slide plate 11 is utilized to limit the speed of the up-and-down reciprocating movement of the piston slide plate 11, the turntable 7, the positioning plate 6, the brake ring 4, the brake wheel 3 and the motor shaft 2 slowly rotate at a constant speed, the electric hoist slowly releases a heavy object, after the heavy object is released, the screw 243 is reversely rotated to drive the hydraulic oil piston 244 to move left, the clamping shaft 144 keeps a state of contacting with the brake ring 4 under the action of the elastic force of the clamping spring 143, then the motor shaft 2 rotates and brakes by starting the electric hoist in an idle load manner, the brake wheel 3 is attached to the brake ring 4 during braking to drive the brake ring 4 to rotate together until the clamping shaft 144 is clamped into the brake ring 4, and (4) finishing.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. The utility model provides a building electric hoist toper arresting gear that lifts by crane, includes motor shaft (2) of casing (1) and electric hoist, the one end of motor shaft (2) extend to casing (1) in and fixedly connected with braked wheel (3), the middle part of casing (1) inner chamber is equipped with brake ring (4), is equipped with brake spring (5) on motor shaft (2), its characterized in that: the brake device is characterized in that the brake ring (4) is rotatably sleeved with the shell (1), a clamping mechanism (14) for limiting the brake ring (4) is arranged on the outer side of the shell (1), one side, far away from the brake wheel (3), of the brake ring (4) is fixedly connected with a positioning plate (6), the middle part, far away from one side of the brake wheel (3), of the positioning plate (6) is fixedly connected with a turntable (7), one side, far away from the positioning plate (6), of the turntable (7) is provided with a crank connecting rod mechanism (8), one side, far away from the turntable (7), of the crank connecting rod mechanism (8) is rotatably sleeved with a universal driving shaft (9) capable of longitudinally moving, the top of the shell (1) is fixedly connected with a vertical pipe (10) positioned above the universal driving shaft (9), the top end of the universal driving shaft (9) extends to the inside of the vertical pipe (10) and is fixedly connected with a piston sliding plate (11), and a damping hole is formed in the piston sliding plate (11), the outside of universal driving shaft (9) and the top movable seal of casing (1), and be full of hydraulic oil in standpipe (10), the fixed cover in middle part in casing (1) outside is equipped with annular oil pipe (13) that are located standpipe (10) one side, after the inner chamber of annular oil pipe (13) is full of hydraulic oil, screens mechanism (14) cancel the rotatory injecing to brake ring (4), one side switch-on of annular oil pipe (13) bottom has defeated oil pipe (23), defeated oil pipe (23) keep away from the one end switch-on of annular oil pipe (13) and have accuse oily device (24).

2. The conical braking device of the building hoisting electric hoist according to claim 1, characterized in that: the quantity of screens mechanism (14) is four, screens mechanism (14) are including registration arm (141) of fixed mounting on annular oil pipe (13), and the inner chamber of registration arm (141) communicates with each other with the inner chamber of annular oil pipe (13), the inside movable sleeve of registration arm (141) is equipped with by movable plate (142), be equipped with screens spring (143) between the inner wall of by movable plate (142) and registration arm (141), one side fixedly connected with card axle (144) of screens spring (143) are kept away from by movable plate (142), the one end of card axle (144) extend to the inside of casing (1) and with the outside swing joint of brake ring (4).

3. The conical braking device of the building hoisting electric hoist according to claim 1, characterized in that: oil control device (24) include main oil pipe (241) with defeated oil pipe (23) switch-on, the fixed cover in one side that defeated oil pipe (23) was kept away from in main oil pipe (241) is equipped with sealed swivel nut (242), the middle part screw thread cover of sealed swivel nut (242) is equipped with screw rod (243), the one end bearing housing of screw rod (243) is equipped with the pressure oil piston (244) that are located main oil pipe (241) inside, the outside of pressing oil piston (244) is laminated with the inner wall activity of main oil pipe (241), and main oil pipe (241) press oil piston (244) one side of keeping away from screw rod (243) to be full of hydraulic oil, the other end fixedly connected with of screw rod (243) is located the outside helm steering of main oil pipe (241).

4. The conical braking device of the building hoisting electric hoist as claimed in claim 2, wherein: a limiting plate (17) is fixedly sleeved on one side inside the shell (1), an annular compensating pipe (18) positioned on one side of the limiting plate (17) is fixedly sleeved in the shell (1), the side surface of the annular compensating pipe (18) is hermetically connected with the side surface of the limiting plate (17), the inner side of the limiting plate (17) is movably sleeved with the outer side of the motor shaft (2), a piston sliding ring (19) is movably sleeved in the annular compensating pipe (18), the top and the bottom of the side surface of the piston sliding ring (19) are respectively and fixedly connected with a push shaft (20), one end, far away from the piston sliding ring (19), of the push shaft (20) extends out of the outer side of the annular compensating pipe (18) and is fixedly connected with a push plate (21), one side, far away from the brake ring (4), of the brake wheel (3) is in bearing connection with the limiting plate (22), and the limiting plate (22) is movably sleeved on the outer side of the motor shaft (2), the brake spring (5) is arranged between the push plate (21) and the limiting plate (22), an oil guide pipe (15) is communicated between the inner cavity of the annular compensation pipe (18) and the inner cavity of the oil conveying pipe (23), a spring type one-way valve (16) is arranged on the oil guide pipe (15), and the opening elasticity of the spring type one-way valve (16) is larger than that of the clamping spring (143).

5. The conical braking device of the building hoisting electric hoist according to claim 1, characterized in that: the limiting ring (12) located on one side of the positioning plate (6) is fixedly sleeved in the shell (1), the limiting ring (12) is located on the outer side of the rotary table (7), the limiting ring (12) is not in contact with the crank connecting rod mechanism (8), and an end face bearing is arranged between the limiting ring (12) and the positioning plate (6).

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