CN214613946U - Stepless locking device for gate - Google Patents

Abstract

The utility model provides a stepless locking device of gate. The stepless locking device comprises a stressed connecting rod, a retainer, a power stud and a bearing nut; the stud body of the power stud is arranged in the retainer, the upper end and the lower end of the stud body are respectively connected with the retainer through a rack bearing, and a power device of the power stud controls the stud body to rotate in the retainer; the bearing nut is vertically fixed on a hydraulic structure, a limit slideway is vertically arranged on the inner wall of the bearing nut, the stud body and the retainer are both arranged in a threaded inner cavity of the bearing nut, the external thread of the stud body is closely matched with the internal thread of the bearing nut, and the retainer is connected with the limit slideway on the inner wall of the bearing nut in a sliding manner through an adjusting wheel; one end of the stress connecting rod is rotatably connected with the stud body, and the other end of the stress connecting rod is connected with the gate hinge. The utility model provides a gate stepless locking problem at the optional position, prevent to play to rise the accident that the trouble leads to the gate free fall because of the owner of gate, also avoid the gate to take place resonance when certain aperture crosses water.

Description

Stepless locking device for gate

Technical Field

The utility model relates to a gate safety locking device among the hydraulic engineering, concretely relates to can open the gate stepless locking device of stroke range optional position to gate safety locking at the gate.

Background

In the lifting process of the hydraulic engineering gate, the gate falls freely due to the failure of lifting equipment; or when the gate stops at a certain opening, the water flow and the gate excite resonance due to the water passing of the gate, so that the gate and hoisting equipment thereof are damaged by resonance, and safety accidents are caused.

At present, a large gate hoisting device is usually operated by a hydraulic hoist, after the operation is finished, the gate slides downwards due to the internal leakage of an oil cylinder, when the gate descends to a certain distance, the hydraulic hoist is started again to work to lift the gate, and other methods are not available at present for enabling the gate to be stable at a certain position for a long time and not slide downwards; if the large-scale gate hoisting equipment is operated by a steel wire rope hoisting hoist, after the operation is finished, the orifice is flushed with water, the water impacts the gate, and the water and the gate generate resonance, so that the opening degree of the resonance area can be avoided only passively at present, and no other method is available for enabling the gate not to generate resonance at any opening degree.

Disclosure of Invention

The utility model discloses according to prior art's not enough, a stepless locking device of gate is provided, the device can lock the gate in the optional position of aperture within range, and very big protection gate safety is applicable to the headstock gear of any form of gate and plays to rise the system.

In order to achieve the technical purpose, the utility model provides a stepless locking device of a gate. The stepless locking device comprises a stressed connecting rod, a retainer, a power stud and a bearing nut; the power stud comprises a power device and a stud body, wherein the upper end and the lower end of the stud body are respectively provided with a rack bearing, the stud body is arranged in the retainer, the upper end and the lower end of the stud body are respectively connected with the retainer through the rack bearings, the power device is arranged above the retainer, an output shaft of the power device is connected with the rack bearing at the upper end of the stud body, and the stud body is driven by the power device to rotate in the retainer; the bearing nut is vertically fixed on a hydraulic structure, the internal thread of the bearing nut is matched with the external thread of the power stud, a limiting slideway is vertically arranged on the inner wall of the bearing nut, the stud body and the retainer are both arranged in a threaded inner cavity of the bearing nut, the external thread of the stud body is tightly matched with the internal thread of the bearing nut, the retainer is connected with the limiting slideway on the inner wall of the bearing nut in a sliding manner through an adjusting wheel, and when the stud body is driven by a power device to rotate, the stud body and the retainer respectively move up and down along the threaded inner cavity of the bearing nut and the limiting slideway; one end of the stress connecting rod is rotatably connected with the stud body, and the other end of the stress connecting rod is connected with the gate hinge.

The utility model discloses better technical scheme: the double-screw bolt body is hollow double-screw bolt, the atress connecting rod includes main atress axle, gate connecting axle and cardan shaft, main atress axle is arranged in hollow double-screw bolt to be connected with hollow double-screw bolt through self-aligning ball bearing, cardan shaft one end and main atress axle hinged joint, the other end and gate connecting axle hinged joint.

The utility model discloses better technical scheme: the bearing nut comprises at least two nut pieces, each nut piece is provided with an internal thread matched with the power stud, the at least two nut pieces are fixed on a hydraulic structure, a stud lifting cavity matched with the stud body is formed by thread surfaces of the nut pieces, a limiting slide way is formed between every two adjacent nut pieces, the stud body and the retainer are arranged in the stud lifting cavity of the bearing nut, the external threads of the stud body are tightly matched with the internal threads of the stud lifting cavity, and the regulating wheel of the retainer moves along the limiting slide way between every two adjacent nut pieces.

The utility model discloses better technical scheme: the power device comprises a brake, a torque motor and a speed reducer, wherein the torque motor and the brake are integrated and have an online monitoring function, and the actions of the torque motor and the brake are interlocked with the action of the gate; the torque motor is connected with a frame bearing at the upper end of the stud body through a speed reducer and a power shaft.

The utility model discloses better technical scheme: the rotation direction of the power stud is matched with the ascending or descending of the gate; the rotation speed is greater than the gate ascending or descending speed.

The utility model discloses further technical scheme: the adjusting wheel comprises a roller, a roller shaft, a roller frame, an adjusting screw and a supporting frame, the roller is supported on the roller frame through the roller shaft, the adjusting screw is connected with a bearing at the tail end of the roller frame, the adjusting screw can rotate in the supporting frame in a threaded mode to drive the roller frame to slide, and the gap between the roller and the limiting slide way is adjusted.

The utility model discloses better technical scheme: self-aligning ball bearing inner rings are respectively installed at two ends of a main stress shaft of the stress connecting rod, two self-aligning ball bearing outer rings are both installed inside a hollow stud of the power stud, damping springs are respectively installed at two ends of the main stress shaft, and the direction of the universal shaft is adjusted all around.

The utility model discloses better technical scheme: the two nut pieces are symmetrically arranged, a stud lifting cavity is formed between the two nut pieces, the upper end face and the lower end face of the stud lifting cavity are closed faces, and a stress connecting rod through hole is formed in the lower end sealing face; the retainer is a rectangular frame body, four corners of the upper end surface and the lower end surface of the retainer are respectively provided with adjusting wheels, the width of the retainer is smaller than the diameter of the stud body, when the retainer is arranged in a stud lifting cavity formed by two nut pieces, the part of the stud body protruding out of the retainer is matched and screwed with the internal threads of the nut pieces, and the four adjusting wheels of the retainer respectively move up and down along the smooth planes of the two sides of the two nut pieces.

The utility model discloses better technical scheme: the back welding of every nut piece has the atress board, corresponds on nut piece and atress board and is equipped with the bolt hole, and nut piece and atress board pass through screw rod fixed connection, and the atress board is pour with the hydraulic structure and is formed wholly.

The utility model discloses better technical scheme: the inner ring of the frame bearing is fixedly arranged on the stud body, and the outer ring of the frame bearing is fixedly arranged on the upper end surface and the lower end surface of the retainer.

The utility model discloses a stepless locking device of gate includes atress connecting rod, holder, power double-screw bolt, bearing nut, and the lower extreme of power double-screw bolt passes through atress connecting rod and gate hinged joint, and the control of power double-screw bolt in power motor can reciprocate and stop at any time in the bearing nut, and its power motor can be controlled through the control terminal of wireless or wired connection external world, generally through wireless control; the movement of the power screw column is synchronous with the main power movement of the gate, the movement speed of the power screw column is greater than the movement speed of the gate, safety guarantee can be provided under any working state of the gate, and the power screw column is locked under the condition that the gate breaks down; the retainer can ensure that the stud normally moves along the nut and can ensure the stability of the stud in the moving process, the power of the power stud can be timely unlocked when the hollow stud and the stressed nut are reliably self-locked, the rotating direction is determined by the ascending or descending of the gate, and the rotating speed is greater than the ascending or descending speed of the gate; the torque motor and the brake of the power stud have an online monitoring function, the actions of the torque motor and the brake and the action of the gate form interlocking, and the online monitoring function and the interlocking function can be realized by the prior art; the stress connecting rod is arranged in the stud body through the self-aligning ball bearing, and the damping spring is arranged to reduce the vibration of the gate lock in the timing process and adapt to the change of the stress direction of the universal shaft when the gate ascends or descends, so that the direction can be adjusted all around, and the normal opening of the gate cannot be influenced in the rotation process of the stud.

The utility model can lock the gate at any position within the opening range, greatly protect the safety of the gate, solve the problem of free fall of the gate caused by the fault of the gate hoist, reduce the vibration of the gate under any opening of the gate, and is suitable for hoist lifting systems of any forms of the gate; the utility model discloses novel structure, reasonable in design fully considers hydraulic engineering's equipment safety for the gate can safe effective operation.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a cross-sectional view AA' of FIG. 1;

FIG. 3 is a schematic cross-sectional view of a load-bearing nut of the present invention;

FIG. 4 is a cross-sectional view of BB' of FIG. 3;

FIG. 5 is a schematic view of the connection between the power stud and the stressed connecting rod of the present invention;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a cross-sectional view CC' of FIG. 5;

FIG. 8 is a schematic structural view of a power stud according to the present invention;

FIG. 9 is a schematic structural view of a force-bearing connecting rod according to the present invention;

fig. 10 is a schematic elevation view of a cage of the present invention;

fig. 11 is a schematic plan view of a retainer of the present invention;

fig. 12 is an assembly view of the adjustment wheel of the present invention;

fig. 13 is a schematic diagram of the upward movement of the power stud according to the present invention.

In the figure: 1-gate, 2-hydraulic building, 3-stress connecting rod, 300-main stress shaft, 301-gate connecting shaft, 302-universal shaft, 303-self-aligning ball bearing, 304-damping spring, 4-retainer, 400-regulating wheel, 4001-roller, 4002-roller shaft, 4003-roller frame, 4004-regulating screw, 4005-bearing frame, 5-power stud, 500-power device, 5001-brake, 5002-torque motor, 5003-speed reducer, 5004-power shaft, 501-stud body, 502-frame bearing, 6-bearing nut, 600-nut piece, 601-stud lifting cavity, 602-stress plate, 603-screw and 7-limiting slideway.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings. Fig. 1 to 13 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the purpose of the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the embodiment, as shown in fig. 1 and 2, the stepless locking device for the gate comprises a stressed connecting rod 3, a retainer 4, a power stud 5 and a bearing nut 6, wherein the bearing nut 6 is vertically fixed on the hydraulic structure 2, and the inner thread of the bearing nut is matched with the outer thread of the power stud 5. As shown in fig. 3 and 4, the bearing nut 6 includes two nut pieces 600, the inner wall of each nut piece 600 is provided with an internal thread matched with the power stud 5, two sides of each nut piece 600 are smooth planes, a plane included angle is 90 degrees, the two nut pieces 600 are symmetrically arranged, the back side of each nut piece 600 is welded with a stress plate 602, bolt holes are correspondingly formed in the nut pieces 600 and the stress plate 602, the nut pieces 600 and the stress plate 602 are fixedly connected through a screw 603, and the stress plate 602 and the hydraulic structure 2 are poured to form a whole. The thread surfaces of the two nut pieces 600 form a stud lifting cavity 601 matched with the stud body 501, the upper end surface and the lower end surface of the stud lifting cavity 601 are closed surfaces, and the lower end surface is provided with a stress connecting rod through hole; two nut pieces 600 are fixed on the hydraulic structure 2, and a limiting slide 7 is formed between the adjacent smooth side faces of the two nut pieces 600. As shown in fig. 8, the power stud 5 includes a power device 500 and a stud body 501, the stud body 501 is a hollow stud, and frame bearings 502 are respectively disposed at upper and lower ends of the stud body 501; as shown in fig. 11 and 12, the holder 4 is a rectangular holder body, the width of the holder 4 is smaller than the diameter of the stud body 501, and four corners of the upper and lower end surfaces of the holder are respectively provided with the adjusting wheels 400; as shown in fig. 5, the stud body 501 is disposed in the holder 4, the upper and lower end portions of the stud body 501 are respectively coupled with the holder 4 through the frame bearings 502, the power device 500 is disposed above the holder 4, the output shaft of the power device 500 is connected with the frame bearings 502 at the upper end of the stud body 501, and the stud body 501 is driven by the power device 500 to rotate in the holder 4, the inner ring of the frame bearing 502 is fixedly mounted on the stud body 501, the outer ring of the frame bearing 502 is fixedly mounted on the upper and lower end surfaces of the holder 4, so that the holder 4 can be ensured not to rotate when the stud body 501 rotates. As shown in fig. 1, the retainer 4 and the power stud 5 are both disposed in a stud lifting cavity 601 of the bearing nut 6, a portion of the stud body 501 protruding out of the retainer 4 is tightly fitted with the internal threads of the nut pieces 600, and the four adjusting wheels 400 of the retainer 4 respectively move up and down along the smooth planes on the two sides of the two nut pieces 600. One end of the stressed connecting rod 3 is rotatably connected with the stud body 501, the other end of the stressed connecting rod is hinged with the gate 1, and when the power device 500 drives the stud body 501 to rotate, the stud body 501 and the retainer 4 respectively move up and down along the threaded inner cavity of the bearing nut 6 and the limiting slideway 7; the rotating direction of the power stud 5 is matched with the ascending or descending of the gate 1; the rotation speed is greater than the ascending or descending speed of the shutter 1.

In the embodiment, a stressed connecting rod 3 of the stepless locking device for the gate is shown in fig. 9 and comprises a main stressed shaft 300, a gate connecting shaft 301 and a universal shaft 302, wherein one end of the universal shaft 302 is hinged with the main stressed shaft 300, and the other end of the universal shaft 302 is hinged with the gate connecting shaft 301; as shown in fig. 5, the main stressed shaft 300 is arranged in the hollow stud and connected with the hollow stud through a self-aligning ball bearing 303; self-aligning ball bearings 302 are respectively arranged at two ends of the main stressed shaft 300, outer rings of the two self-aligning ball bearings 302 are respectively arranged inside the hollow studs of the power studs 5, and damping springs 304 are respectively arranged at two ends of the main stressed shaft 300 so as to reduce vibration during locking of the gate 1 and adapt to changes of stress directions of the universal shaft 33 during ascending or descending of the gate 1, and the directions of the universal shaft 302 are adjusted all around.

In the embodiment of the stepless locking device for the gate, as shown in fig. 8, the power device 500 includes a brake 5001, a torque motor 5002 and a speed reducer 5003, the torque motor 5002 and the brake 5001 are integrated and have an online monitoring function, and the actions of the torque motor 5002 and the brake 5001 and the action of the gate 1 form an interlock; the torque motor 5002 is coupled with a frame bearing at the upper end of the stud body 501 through a speed reducer 5003 and a power shaft 5004. As shown in fig. 12, the adjusting wheel 400 includes a roller 4001, a roller shaft 4002, a roller frame 4003, an adjusting screw 4004 and a supporting frame 4005, the roller 4001 is supported on the roller frame 4003 through the roller shaft 4002, the adjusting screw 4004 is coupled to a bearing at the tail end of the roller frame 4003, the adjusting screw 4004 can rotate in the supporting frame 4005 by a screw thread to drive the roller frame 4003 to slide, and a gap between the roller 4001 and the limiting slide 7 is adjusted.

The utility model provides a stepless locking device, about its bearing nut 6 highly generally is 2m, its power double-screw bolt 5 reciprocate the stroke and be 1.5 ~ 1.8m, its specific working process as follows:

before gate 1 promotes the operation, the utility model provides a stepless locking device's the electricity that gets, on-line monitoring detects torque motor 5002 and stopper 5001 normally, control through wireless or wired, send the instruction of operatable gate 1, select to promote gate 1 this moment, stepless locking device's torque motor 5002 drives hollow double-screw bolt body 501 rotation through reduction gear 5003, and the rotation speed is greater than gate 1 and rises speed for power double-screw bolt 5 constantly rises in bearing nut 6, up to gate 1 main hoisting mechanism stop work.

On the contrary, before the gate 1 descends and runs, the stepless locking device is powered on, the torque motor 5002 and the brake 5001 are monitored and detected on line and normal, an instruction for operating the gate 1 is sent, the gate 1 is selected to descend at the moment, the torque motor 5002 of the stepless locking device drives the hollow stud body 501 to rotate through the speed reducer 5003, the rotating speed is greater than the descending speed of the gate 1, and the power stud 5 is enabled to descend continuously until the main hoisting mechanism of the gate 1 stops working.

In the lifting or descending process of the middle gate 1, the main lifting mechanism breaks down suddenly, the torque motor 5002 of the stepless locking device drives the hollow stud body 501 to still rotate through the speed reducer 5003 at the moment, but the rotation speed is greater than the descending speed of the gate 1, so that the phenomenon of free falling caused by the incontrollable descending of the gate can be avoided;

before the gate 1 is lifted or descended to run, the stepless locking device is powered on, the abnormality of the torque motor 5002 or the brake 5001 is monitored and detected on line, and the system gives an alarm and cuts off the power supply of the main lifting mechanism of the gate 1.

The gate 1 is lifted or descended to any opening degree, the power supply of the main lifting mechanism is cut off, the gate 1 is in a locking state at the opening degree, all parts of the stepless locking device are rigid, and the vibration of the gate can be effectively reduced due to the damping spring arranged in the stepless locking device.

The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a gate stepless locking device which characterized in that: the stepless locking device comprises a stressed connecting rod (3), a retainer (4), a power stud (5) and a bearing nut (6); the power stud (5) comprises a power device (500) and a stud body (501), the upper end and the lower end of the stud body (501) are respectively provided with a rack bearing (502), the stud body (501) is arranged in the retainer (4), the upper end and the lower end of the stud body are respectively connected with the retainer (4) through the rack bearing (502), the power device (500) is arranged above the retainer (4), the output shaft of the power device is connected with the rack bearing at the upper end of the stud body (501), and the stud body (501) is driven to rotate in the retainer (4) through the power device (500); the bearing nut (6) is vertically fixed on the hydraulic structure (2), the internal thread of the bearing nut is matched with the external thread of the power stud (5), a limiting slideway (7) is vertically arranged on the inner wall of the bearing nut (6), the power stud (5) and the retainer (4) are both arranged in the threaded inner cavity of the bearing nut (6), the external thread of the stud body (501) is tightly matched with the internal thread of the bearing nut (6), the retainer (4) is connected with the limiting slideway (7) on the inner wall of the bearing nut (6) in a sliding mode through an adjusting wheel (400), and when the power device (500) drives the stud body (501) to rotate, the stud body (501) and the retainer (4) respectively move up and down along the threaded inner cavity of the bearing nut (6) and the limiting slideway (7); one end of the stress connecting rod (3) is rotatably connected with the stud body (501), and the other end of the stress connecting rod is hinged with the gate (1).

2. The gate stepless locking device according to claim 1, characterized in that: stud body (501) are hollow studs, atress connecting rod (3) are including main atress axle (300), gate connecting axle (301) and cardan shaft (302), main atress axle (300) are arranged in hollow studs to be connected with hollow studs through aligning ball bearing (303), cardan shaft (302) one end and main atress axle (300) hinged joint, the other end and gate connecting axle (301) hinged joint.

3. A gate stepless locking device according to claim 1 or 2, characterized in that: bearing nut (6) include two piece at least nut pieces (600), every nut piece (600) inner wall be equipped with power double-screw bolt (5) assorted internal thread, two piece at least nut pieces (600) are all fixed on hydraulic structure (2), its flank of screw constitute with double-screw bolt body (501) assorted double-screw bolt lift chamber (601), form spacing slide (7) between two adjacent nut pieces (600), double-screw bolt body (501) and holder (4) are all arranged in double-screw bolt lift chamber (601) of bearing nut (6), and the external screw thread of double-screw bolt body (501) closely cooperates with the internal thread in double-screw bolt lift chamber (601), and regulating wheel (400) of holder (4) remove along spacing slide (7) between two adjacent nut pieces (600).

4. A gate stepless locking device according to claim 1 or 2, characterized in that: the power device (500) comprises a brake (5001), a torque motor (5002) and a speed reducer (5003), wherein the torque motor (5002) and the brake (5001) are integrated and have an online monitoring function, and the actions of the torque motor (5002) and the brake (5001) and the action of the gate (1) form interlocking; the torque motor (5002) is connected with a rack bearing at the upper end of the stud body (501) through a speed reducer (5003) and a power shaft (5004).

5. A gate stepless locking device according to claim 1 or 2, characterized in that: the rotating direction of the power stud (5) is matched with the ascending or descending of the gate (1); the rotating speed is larger than the ascending or descending speed of the gate (1).

6. A gate stepless locking device according to claim 1 or 2, characterized in that: the adjusting wheel (400) comprises a roller wheel (4001), a roller wheel shaft (4002), a roller wheel frame (4003), an adjusting screw rod (4004) and a supporting frame (4005), wherein the roller wheel (4001) is supported on the roller wheel frame (4003) through the roller wheel shaft (4002), the adjusting screw rod (4004) is connected to a bearing at the tail end of the roller wheel frame (4003), and the adjusting screw rod (4004) can rotate in the supporting frame (4005) in a threaded manner to drive the roller wheel frame (4003) to slide and adjust a gap between the roller wheel (4001) and a limiting slide way (7).

7. The gate stepless locking device according to claim 2, characterized in that: self-aligning ball bearing (303) inner circle is installed respectively at main atress axle (300) both ends of atress connecting rod (3), and two self-aligning ball bearing (303) outer circles are all installed inside the hollow stud of power stud (5) to install damping spring (304) respectively at the both ends of main atress axle (300), the position is adjusted all around to cardan shaft (302).

8. A gate stepless locking device according to claim 3, characterized in that: the two nut pieces (600) are provided with two smooth planes at two sides of each nut piece (600), the included angle of the planes is 90 degrees, the two nut pieces (600) are symmetrically arranged, a stud lifting cavity (601) is formed between the two nut pieces, the upper end face and the lower end face of the stud lifting cavity (601) are closed faces, and a stress connecting rod through hole is formed in the lower end sealing face; the screw bolt lifting mechanism is characterized in that the retainer (4) is a rectangular frame body, four corners of the upper end face and the lower end face of the retainer are respectively provided with adjusting wheels (400), the width of the retainer (4) is smaller than the diameter of the screw bolt body (501), when the retainer (4) is placed in a screw bolt lifting cavity (601) formed by two screw bolt pieces (600), the part of the screw bolt body (501) protruding out of the retainer (4) is screwed in matching with the internal threads of the screw bolt pieces (600), and the four adjusting wheels (400) of the retainer (4) respectively move up and down along the smooth planes of the two sides of the two screw bolt pieces (600).

9. A gate stepless locking device according to claim 3, characterized in that: the back welding of every nut piece (600) has atress board (602), corresponds on nut piece (600) and atress board (602) and is equipped with the bolt hole, and nut piece (600) and atress board (602) pass through screw rod (603) fixed connection, and atress board (602) pour with hydraulic structure (2) and form wholly.

10. The apparatus of claim 4, wherein: the inner ring of the frame bearing (502) is fixedly arranged on the stud body (501), and the outer ring of the frame bearing (502) is fixedly arranged on the upper end face and the lower end face of the retainer (4).

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