Hoist with mechanical stall protection

Abstract

The application discloses a winding machine with a mechanical stall protection device and relates to the field of winding machines, which comprises a winding drum and a driving motor. Fixed side plates are arranged on the two sides of the winding drum. A limiting cylinder is arranged on the side of the winding drum and is aligned with the fixed side plates. A ratchet disc is arranged at the aligned position of the fixed side plates and the limiting cylinder. Two groups of centrifugal mechanisms are symmetrically arranged in the limiting cylinder, and a centrifugal hammer is arranged at the end of each group of centrifugal mechanisms. A connecting rod is arranged on the outer wall of the centrifugal mechanism. A ratchet pawl is arranged on the outside of each group of centrifugal mechanisms. The ratchet disc and the positioning ring can be used to absorb the impact force through a plurality of buffer springs during the deceleration and stopping process of the winding drum, reduce the impact on the ratchet disc, further reduce the impact damage on the ratchet disc and the ratchet pawl, and enable the ratchet disc and the ratchet pawl to be closely attached through the buffer spring during the stopping process, so that the ratchet pawl and the ratchet disc are prevented from being separated.

Description

Technical Field

[0001] The present invention relates to the field of winches, in particular to a winch with a mechanical stall protection device. Background Art

[0002] A winch, also known as a winch, is a lightweight lifting device that uses a drum wrapped around a wire rope or chain to lift or pull heavy objects. It can lift objects vertically or pull objects horizontally or at an angle. Existing winches (except for worm gear systems) use electrical protection devices (such as motor brakes and braking devices). If the brakes fail or are damaged, or if the brakes are severely worn, the objects being carried will fall at an accelerated rate, resulting in accidents and losses.

[0003] For example, the winch with a speed limiting component disclosed in prior art 202221842151.8 can brake the rotating disk of the centrifugal swing component through the connecting seat when the winch stalls, and the rotating disk of the centrifugal swing component is speed-limited and locked, and the speed-limiting and locking process is performed in the event of a power outage or emergency.

[0004] However, in the prior art, during the locking process through centrifugal force, the centrifugal mechanism will be thrown out when the winch rotates rapidly, driving the limiting structure to engage with the fixed structure, thereby achieving engagement. However, in the prior art, the limiting mechanism is usually placed vertically (axially fixed to the winch), so it will cause the limiting mechanism to shift due to gravity when it is in the lower position. During use, if the speed of the winch increases slightly, the limiting mechanism below will be thrown out prematurely and come into contact with the fixed structure, causing unnecessary jamming and wear, affecting the use effect. Moreover, the existing limiting mechanism usually adopts a reset structure (such as a spring, etc.) to control the centrifugal mechanism. During the limiting process, the speed of the winch will decelerate from a high speed to a stationary state in a short time. During this process, the fixed structure and the limiting mechanism will be subjected to a great impact, which can easily cause damage to the limiting mechanism. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a winch with a mechanical stall protection device to solve the technical problem that the centrifugal mechanism in the winch is prone to slight contact with the limiting mechanism and the impact force during the limiting process is large and easily causes damage.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a winch with a mechanical stall protection device, comprising a winding drum and a driving motor, fixed side plates are installed on both sides of the winding drum, a limiting cylinder is installed on the side of the winding drum, and the limiting cylinder is aligned with the fixed side plate, and a ratchet disk is installed at the aligned position of the fixed side plate and the limiting cylinder, two groups of centrifugal mechanisms are symmetrically installed inside the limiting cylinder, and a centrifugal hammer is installed at the end of each group of centrifugal mechanisms, a connecting rod is installed on the outer wall of the centrifugal mechanism, the limiting cylinder is located on the outer side of each group of centrifugal mechanisms and a pawl is installed, the pawl is transmission-connected to the centrifugal mechanism through the connecting rod, the pawl is aligned with the inner wall of the ratchet disk, the bottom end of the centrifugal hammer is connected to a return spring, and the end of the return spring is fixedly connected to the inner wall of the limiting cylinder, the inner wall of the limiting cylinder is provided with a snapping groove, a positioning block is installed inside the snapping groove, and the positioning block is aligned with the back side of the centrifugal mechanism, and a snapping groove is provided on the back side of the centrifugal mechanism.

[0007] By adopting the above technical solution, when the winding drum stalls, the centrifugal mechanism can drive the pawl to rotate out and engage with the ratchet disk, thereby limiting the winding drum and fixing the stalled winding drum. In the process of fixing, the centrifugal mechanism is limited by the positioning block.

[0008] The present invention is further configured such that a plurality of positioning rods are installed on the outer side of the winding drum, and the end of each positioning rod is fixed to the inner side of the fixed side plate, and a cross frame is installed on the bottom end of the fixed side plate.

[0009] By adopting the above technical solution, the reel can be limited by the positioning rod, thereby fixing the cable.

[0010] The present invention is further configured such that the output end of the driving motor is connected to a reducer, a base is installed at the bottom end of the reducer, the base is fixed on the horizontal frame, a transmission shaft is installed inside the reducer, and the transmission shaft passes through the fixed side plate and is transmission-connected to the winding drum.

[0011] By adopting the above technical solution, the driving motor can be conveniently driven to drive the winding drum to rotate.

[0012] The present invention is further configured such that a fixed disk is connected to the outer side of the ratchet disk, and a plurality of fixed blocks are installed on the outer wall of the fixed disk, and the fixed blocks are fixedly connected to the fixed side plates.

[0013] By adopting the above technical solution, the ratchet disc can be limited and fixed by the fixing block.

[0014] The present invention is further configured such that a threaded groove is provided inside each group of the fixing blocks, a bolt is installed inside the threaded groove, and the fixing blocks are fixedly connected to the fixing side plates via the bolts.

[0015] By adopting the above technical solution, the fixing block can be fixed, thereby fixing the ratchet disc.

[0016] The present invention is further configured such that a buffer spring is installed on the side of each group of the fixed blocks, a positioning ring is installed on the outer side of the fixed block, the positioning ring is fixed on the outer wall of the fixed side plate, and the inner wall of the positioning ring is located on the side of each group of buffer springs and is installed with a protruding block, which limits the buffer spring.

[0017] By adopting the above technical solution, the angle of the ratchet disc can be limited by the buffer spring, thereby absorbing the impact force of the rotation of the ratchet disc.

[0018] The present invention is further configured such that a sealing edge is installed on the outer side of the limiting cylinder, the sealing edge is sleeved on the outer side of the ratchet disc, a sleeve is installed inside the limiting cylinder, and the centrifugal mechanism is symmetrically installed on the outer side of the sleeve.

[0019] By adopting the above technical solution, the centrifugal mechanism can be sealed through the sealing edge, thereby reducing external pollution to the centrifugal mechanism.

[0020] The present invention is further configured such that the top and bottom ends of the positioning block are both provided with connecting plates, and the outer sides of the connecting plates are connected to adsorption magnets, the output end of the positioning block is connected to a push plate, and the interior of the engaging groove is provided with an inclined surface matching the push plate.

[0021] By adopting the above technical solution, the positioning block can be easily fixed. When the extrusion force does not exceed the magnetic force, the positioning block will not move. When the extrusion force exceeds the magnetic force, the positioning block will directly separate from the magnet.

[0022] The present invention is further configured such that fixed magnets are installed on the inner wall of the locking groove at the upper and lower positions of the positioning block, the fixed magnets are in contact with the adsorption magnets, and the fixed magnets limit the positioning block, and a movable spring is installed inside the fixed magnet, and the movable spring is in contact with the inside of the winding drum.

[0023] By adopting the above technical solution, the positioning block can be conveniently limited, thereby preventing the positioning block from failing to limit the centrifugal mechanism.

[0024] In summary, the present invention mainly has the following beneficial effects:

[0025] 1. The present invention provides a dual centrifugal mechanism, which is symmetrically arranged. During the stall process, the dual centrifugal mechanism can be brushed out synchronously, thereby balancing the limit drum and the winding drum, improving the rotation stability of the winding drum, and keeping the center of the winding drum on the axis during the stall process, thereby reducing damage to the transmission shaft.

[0026] 2. The present invention provides a ratchet disk, a centrifugal mechanism and a pawl. When the winding drum stalls, the centrifugal mechanism is thrown out under the action of centrifugal force, pushing the pawl so that the pawl can be stuck inside the ratchet disk, thereby limiting the ratchet disk. In the limiting process, the centrifugal mechanism is limited by the positioning block. In normal use, the centrifugal mechanism is prevented from being thrown out and driving the pawl to engage with the ratchet disk. After the winding drum stalls and stops, the centrifugal mechanism is also limited by the positioning block, so that the pawl locks the collecting drum, preventing the reset spring from driving the centrifugal mechanism to return to its position.

[0027] 3. The present invention also uses the ratchet and positioning ring to slow down and stop the winding drum. During this process, the impact force is first absorbed by multiple groups of buffer springs to reduce the impact on the ratchet, thereby reducing the impact damage to the ratchet and the pawl. In addition, during the stopping process, the buffer spring can drive the ratchet and the pawl to fit tightly together to avoid separation of the pawl and the ratchet. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 This is a schematic structural diagram of the driving motor and the fixed side plate of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the winding drum and the limiting drum of the present invention;

[0031] Figure 4 Schematic diagram of the explosion structure of the stall protection mechanism of the present invention;

[0032] Figure 5 Schematic diagram of the cross-section structure of the stall protection structure of the present invention;

[0033] Figure 6 For the present invention Figure 5 A schematic diagram of the partially enlarged structure at center A;

[0034] Figure 7 This is a schematic diagram of the positioning block structure of the present invention;

[0035] Figure 8 This is a schematic structural diagram of the engagement between the pawl and the ratchet disc of the present invention;

[0036] Figure 9 This is a structural schematic diagram of the position of the centrifugal hammer when engaged in the present invention;

[0037] Figure 10 This is a schematic structural diagram of a limiting mechanism according to a second embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the explosion structure of the limiting mechanism according to the second embodiment of the present invention;

[0039] Figure 12 This is a schematic structural diagram of buffering during position limiting according to the second embodiment of the present invention.

[0040] In the figure: 1. Winding drum; 101. Limiting cylinder; 1011. Engaging groove; 102. Sealing edge; 103. Sleeve; 104. Fixed magnet; 2. Fixed side plate; 201. Cross frame; 3. Positioning rod; 4. Driving motor; 401. Reducer; 402. Base; 403. Transmission shaft; 5. Ratchet; 501. Fixed disk; 502. Fixed block; 503. Buffer spring; 6. Centrifugal mechanism; 601. Centrifugal hammer; 602. Connecting rod; 603. Return spring; 604. Engaging groove; 7. Positioning block; 701. Adsorption magnet; 702. Movable spring; 703. Connecting plate; 704. Pushing plate; 8. Ratchet; 9. Positioning ring; 901. Protruding block. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0042] The following describes an embodiment of the present invention based on its overall structure.

[0043] A winch with a mechanical stall protection device, such as Figures 1 to 8 As shown, it includes a winding drum 1 and a driving motor 4, fixed side plates 2 are installed on both sides of the winding drum 1, and multiple groups of positioning rods 3 are installed on the outside of the winding drum 1, and the ends of each group of positioning rods 3 are fixed on the inner side of the fixed side plate 2, and a cross frame 201 is installed at the bottom end of the fixed side plate 2, and the output end of the driving motor 4 is connected to a reducer 401, and a base 402 is installed at the bottom end of the reducer 401, and the base 402 is fixed on the cross frame 201, and a transmission shaft 403 is installed inside the reducer 401, and the transmission shaft 403 passes through the fixed side plate 2 and is connected to the winding drum 1 for transmission, and a limiting cylinder 101 is installed on the side of the winding drum 1, and the limiting cylinder 101 is aligned with the fixed side plate 2, so that each group of equipment can be limited and fixed.

[0044] See also Figures 3 to 9The fixed side plate 2 and the limiting cylinder 101 are aligned with a ratchet 5, and the outer side of the ratchet 5 is connected to a fixed plate 501, and the outer wall of the fixed plate 501 is installed with multiple groups of fixed blocks 502, each group of fixed blocks 502 has a threaded groove inside, and a bolt is installed inside the threaded groove. The fixed block 502 is fixedly connected to the fixed side plate 2 by the bolt, and two groups of centrifugal mechanisms 6 are symmetrically installed inside the limiting cylinder 101, and a centrifugal hammer 601 is installed at the end of each group of centrifugal mechanisms 6. The outer wall of the centrifugal mechanism 6 is installed There is a connecting rod 602, and a limiting cylinder 101 is located on the outside of each group of centrifugal mechanisms 6 and is equipped with a pawl 8. The pawl 8 is connected to the centrifugal mechanism 6 through the connecting rod 602, and the pawl 8 is aligned with the inner wall of the ratchet disk 5. The bottom end of the centrifugal hammer 601 is connected to a reset spring 603, and the end of the reset spring 603 is fixedly connected to the inner wall of the limiting cylinder 101. When the winding drum stalls, the centrifugal mechanism 6 can be thrown out by centrifugal force, thereby driving the pawl 8 to rotate, and the pawl 8 rotates and engages with the ratchet disk 5, thereby limiting and fixing the winding drum 1.

[0045] See also Figures 4 to 7 , the inner wall of the limiting cylinder 101 is provided with a snap-fit ​​groove 1011, a positioning block 7 is installed inside the snap-fit ​​groove 1011, and the positioning block 7 is aligned with the back of the centrifugal mechanism 6, the back of the centrifugal mechanism 6 is provided with a snap-fit ​​groove 604, the top and bottom ends of the positioning block 7 are provided with connecting plates 703, and the outer side of the connecting plate 703 is connected to the adsorption magnet 701, the output end of the positioning block 7 is connected to the push plate 704, the inside of the snap-fit ​​groove 604 is provided with an inclined surface matching the push plate 704, and the inner wall of the snap-fit ​​groove 1011 is located at the upper and lower positions of the positioning block 7 and is installed with fixed magnetic Iron 104, the fixed magnet 104 is fitted with the adsorption magnet 701, and the fixed magnet 104 limits the positioning block 7, and a movable spring 702 is installed inside the fixed magnet 104, and the movable spring 702 is fitted with the inside of the winding drum 1. The centrifugal mechanism 6 can be limited by the positioning block 7. When the winding drum 1 is in normal use, the centrifugal mechanism 6 is prevented from being thrown out prematurely and causing the pawl 8 and the ratchet disk 5 to wear. After the winding drum 1 stalls and stops, the centrifugal mechanism 6 can also be limited by the positioning block 7, so that the pawl 8 will not separate from the ratchet disk 5, thereby improving the engagement effect.

[0046] See also Figure 3 A sealing edge 102 is installed on the outside of the limiting cylinder 101, and the sealing edge 102 is sleeved on the outside of the ratchet disk 5. A sleeve 103 is installed inside the limiting cylinder 101, and the centrifugal mechanism 6 is symmetrically installed on the outside of the sleeve 103, which can ensure the stability of the winding drum 1 during rotation.

[0047] See also Figures 10 to 12, which is the second embodiment of the present application, the difference is the limiting method of the ratchet 5. The specific structure is that a buffer spring 503 is installed on the side of each group of fixed blocks 502, and a positioning ring 9 is installed on the outside of the fixed block 502. The positioning ring 9 is fixed to the outer wall of the fixed side plate 2, and the inner wall of the positioning ring 9 is located on the side of each group of buffer springs 503. A protruding block 901 is installed, and the protruding block 901 limits the buffer spring 503, so that when the winding drum 1 stalls, the buffer spring 503 can be pressurized by the ratchet 5 to temporarily buffer the impact of the ratchet 5 and reduce the impact of the ratchet 5. After the winding drum 1 stalls and stops, the buffer spring 503 pushes the ratchet 5 to fit tightly with the pawl 8 to prevent the pawl 8 from separating from the ratchet 5.

[0048] When in use, first install the limiting cylinder 101 on the side of the winding drum 1, and limit the limiting cylinder 101 by means of bolts and other structures, then symmetrically install the centrifugal mechanism 6 on the upper and lower sides of the sleeve 103, and limit the centrifugal mechanism by the rotating shaft, and the centrifugal hammer 601 of each group of centrifugal mechanisms 6 fits the outside of the sleeve 103, then fix the end of the return spring 603 in the limiting cylinder 101, then fix the two groups of pawls 8 on the outside of the two groups of centrifugal mechanisms 6 through another group of rotating shafts, and the centrifugal mechanisms 6 are connected to the corresponding pawls 8 through the connecting rod 602, then install a group of ratchet discs 5 on the outside of the fixed side plates 2, and limit the ratchet discs 5 by the fixing blocks 502, then install the winding drum 1 between the two groups of fixed side plates 2, align the limiting cylinder 101 with the ratchet disc 5, and align the ratchet disc 8 with the inner side of the ratchet disc 5, then drive the motor 4 It is installed on the reducer 401 and is transmission-connected with the transmission shaft 403 in the reducer 401. The transmission shaft 403 is inserted into the fixed side plate 2 and passes through the limit cylinder 101 and is fixedly connected to the winding drum 1. When winding, the driving motor 4 drives the winding drum 1 to rotate, thereby winding the cable. During normal use of the winch (especially during the rope-releasing process, the rotation direction is the same as the direction of rotation when the winch is out of control, and the direction of driving the centrifugal mechanism 6 to be thrown out is also the same), the winding drum 1 rotates as driven by the driving motor 4. At this time, the centrifugal mechanism 6 tends to deflect under the drive of the centrifugal hammer 601. However, at this time, the positioning block 7 limits the centrifugal mechanism 6 through the engaging groove 604, preventing the centrifugal mechanism 6 from rotating, thereby preventing the centrifugal mechanism 6 from driving the ratchet 8 to rotate and contact with the ratchet disk 5 during normal use, thereby reducing jamming and wear.

[0049] When the brake of the driving motor 4 fails or the shaft pin in the winding drum 1 is damaged, the winding drum 1 falls under the influence of the gravity of the hanging object and gradually accelerates its fall. At this time, under the centrifugal action of the centrifugal hammer 601, the centrifugal mechanism 6 tends to expand outward. At this time, the centrifugal hammer 601 generates a deflection force on the pushing component of the positioning block 7 under high speed, which is greater than the adsorption force of the positioning block 7. At this time, the engaging groove 604 pushes the positioning block 7 to move through the pushing plate 704, driving the adsorption magnet 701 to separate from the fixed magnet 104, and the magnetic force between the two is weakened, so that the positioning block 7 can be quickly separated to avoid obstruction of the centrifugal mechanism 6. At this time, the centrifugal mechanism 6 drives the ratchet 8 to rotate outward through the connecting rod 602, pushing the ratchet 8 to engage with the ratchet disk 5, thereby limiting the limiting cylinder 101 and then fixing the winding drum 1, realizing protection of the winch when the winch stalls and reducing falling.

[0050] During the stall protection process, the winding drum 1 changes from high-speed rotation to stillness. At this time, the centrifugal mechanism 6 no longer rotates, and the reset spring 603 will pull the centrifugal mechanism 6 back. At this time, during the stillness process, the positioning block 7 will limit the centrifugal mechanism 6 again through the locking groove 604 to prevent the reset spring 603 from pulling the centrifugal mechanism 6 back, thereby maintaining the locking process until the winch is repaired and the winch is started normally to perform the winding action. At this time, the centrifugal hammer 601 will generate an inward deflection force during the winding process, thereby squeezing the positioning block 7 (and due to the different angles of the push plate 704, the force required to push the positioning block 7 during the winding process is less than the force to push the positioning block 7 during centrifugation), thereby realizing the retraction of the centrifugal mechanism 6 and improving the use efficiency.

[0051] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiment without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A winch with a mechanical stall protection device, comprising a winding drum and a drive motor, characterized in that: Fixed side plates are installed on both sides of the winding drum, and limiting cylinders are installed on the sides of the winding drum, and the limiting cylinder is aligned with the fixed side plates, and a ratchet disk is installed at the aligned position of the fixed side plates and the limiting cylinder, and two sets of centrifugal mechanisms are symmetrically installed inside the limiting cylinder, and a centrifugal hammer is installed at the end of each set of centrifugal mechanisms, and a connecting rod is installed on the outer wall of the centrifugal mechanism, and the limiting cylinder is located at the outer side of each set of centrifugal mechanisms and a pawl is installed, the pawl is transmission connected to the centrifugal mechanism through the connecting rod, the pawl is aligned with the inner wall of the ratchet disk, and the bottom end of the centrifugal hammer is connected to a return spring, and the end of the return spring is fixedly connected to the inner wall of the limiting cylinder, and a clamping groove is provided on the inner wall of the limiting cylinder, and a positioning block is installed inside the clamping groove, and the positioning block is aligned with the back side of the centrifugal mechanism, and a clamping groove is provided on the back side of the centrifugal mechanism; The top and bottom ends of the positioning block are both provided with connecting plates, and the outer sides of the connecting plates are connected to adsorption magnets. The output end of the positioning block is connected to a push plate, and the inside of the engaging groove on the back of the centrifugal mechanism is provided with an inclined surface that matches the push plate. The inner wall of the engaging groove in the limiting cylinder is located at the upper and lower positions of the positioning block and is equipped with fixed magnets. The fixed magnets fit with the adsorption magnets and limit the positioning block. A movable spring is installed inside the fixed magnets, and the movable spring fits with the inside of the winding drum. When winding, the driving motor drives the winding drum to rotate. At this time, the centrifugal mechanism is driven by the centrifugal hammer, and the positioning block limits the centrifugal mechanism through the engaging groove, which prevents the centrifugal mechanism from rotating. The centrifugal mechanism drives the pawl to rotate and contact the ratchet disk, reducing jamming and wear. When the driving motor brake fails or the shaft pin in the winding drum is damaged, the winding drum falls under the influence of the gravity of the hanging object and gradually accelerates its fall. Under the centrifugal action of the centrifugal hammer, the centrifugal mechanism tends to expand outward. At high speed, the deflection force generated by the centrifugal hammer on the positioning block is greater than the adsorption force of the positioning block. The engaging groove pushes the positioning block to move through the push plate, driving the adsorption magnet to separate from the fixed magnet. The magnetic force between the two is weakened, so that the positioning block can be quickly separated.

2. A winch with a mechanical stall protection device according to claim 1, characterized in that: A plurality of positioning rods are installed on the outside of the winding drum, and the end of each positioning rod is fixed on the inner side of the fixed side plate, and a cross frame is installed on the bottom end of the fixed side plate.

3. The winch with a mechanical stall protection device according to claim 2, characterized in that: The output end of the driving motor is connected to a reducer, the bottom end of the reducer is installed with a base, the base is fixed on the horizontal frame, a transmission shaft is installed inside the reducer, and the transmission shaft passes through the fixed side plate and is connected to the winding drum for transmission.

4. The winch with a mechanical stall protection device according to claim 1, characterized in that: The outer side of the ratchet disc is connected with a fixed disc, and the outer wall of the fixed disc is equipped with multiple groups of fixed blocks, which are fixedly connected with the fixed side plates.

5. The winch with a mechanical stall protection device according to claim 4, characterized in that: A threaded groove is provided inside each set of fixing blocks, and bolts are installed inside the threaded grooves. The fixing blocks are fixedly connected to the fixing side plates through the bolts.

6. The winch with a mechanical stall protection device according to claim 4, characterized in that: A buffer spring is installed on the side of each set of fixed blocks, and a positioning ring is installed on the outside of the fixed block. The positioning ring is fixed to the outer wall of the fixed side plate, and the inner wall of the positioning ring is located on the side of each set of buffer springs. A protruding block is installed to limit the buffer spring.

7. The winch with a mechanical stall protection device according to claim 1, characterized in that: A sealing edge is installed on the outer side of the limiting cylinder, and the sealing edge is sleeved on the outer side of the ratchet disc. A sleeve is installed inside the limiting cylinder, and the centrifugal mechanism is symmetrically installed on the outer side of the sleeve.

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