A stepless locking device for a gate

Abstract

The present invention provides a stepless locking device for a gate. The stepless locking device includes a force-bearing connecting rod, a cage, a power stud, and a load-bearing nut; the stud body of the power stud is placed inside the cage, and its upper and lower ends are respectively connected to the cage through frame bearings. The power device of the power stud controls the rotation of the stud body inside the cage; the load-bearing nut is vertically fixed on the hydraulic structure, and a limiting slideway is vertically opened on the inner wall of the load-bearing nut. The stud body and the cage are both placed in the threaded inner cavity of the load-bearing nut. The external thread of the stud body is tightly matched with the internal thread of the load-bearing nut, and the cage is slidably connected to the limiting slideway on the inner wall of the load-bearing nut through an adjusting wheel; one end of the force-bearing connecting rod is rotatably connected to the stud body, and the other end is hinged to the gate. The present invention solves the problem of stepless locking of the gate at any position, prevents accidents caused by the free fall of the gate due to the main hoisting failure of the gate, and also avoids resonance when the gate passes water at a certain opening degree.

Description

Technical Field

[0001] The present invention relates to a gate safety locking device in water conservancy projects, and particularly to a stepless locking device for gates that can lock the gate safely at any position within the opening stroke range of the gate. Background Art

[0002] During the hoisting process of the gate in a water conservancy project, the gate may fall freely due to hoisting equipment failure; or when the gate stops at a certain opening degree, due to the water flow passing through the gate, the water flow and the gate excite resonance, resulting in resonance damage to the gate and its hoisting equipment, causing safety accidents.

[0003] Currently, large-scale gate hoisting equipment usually uses a hydraulic hoist for operation. After the operation is completed, the gate slides down due to internal leakage of the oil cylinder. When the gate drops to a certain distance, the hydraulic hoist is started again to lift the gate. At present, there is no other method to keep the gate stable at a certain position without sliding for a long time; if a wire rope winch hoist is used for the operation of large-scale gate hoisting equipment, after the operation is completed, the water flow passes through the orifice, impacts the gate, and resonance occurs between the water flow and the gate. Currently, only the opening degree in the resonance avoidance area can be selected passively, and there is no other method to prevent the gate from generating resonance at any opening degree. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a stepless locking device for gates, which can lock the gate at any position within the opening range, greatly protecting the safety of the gate and being applicable to the hoisting systems of any form of hoist for the gate.

[0005] To achieve the above technical objectives, the present invention provides a stepless locking device for gates. The stepless locking device includes a force-bearing connecting rod, a cage, a power stud, and a load-bearing nut; the power stud includes a power device and a stud body. Frame bearings are respectively provided at the upper and lower ends of the stud body. The stud body is placed inside the cage, and its upper and lower ends are respectively connected to the cage through the frame bearings. The power device is placed above the cage, and its output shaft is connected to the frame bearing at the upper end of the stud body, and drives the stud body to rotate inside the cage through the power device; the load-bearing nut is vertically fixed on the hydraulic structure, and its internal thread matches the external thread of the power stud. A limiting slideway is vertically opened on the inner wall of the load-bearing nut. The stud body and the cage are both placed inside the threaded cavity of the load-bearing nut. The external thread of the stud body is tightly matched with the internal thread of the load-bearing nut. The cage is slidably connected to the limiting slideway on the inner wall of the load-bearing nut through an adjusting wheel. When the power device drives the stud body to rotate, the stud body and the cage respectively move up and down along the threaded cavity and the limiting slideway of the load-bearing nut; one end of the force-bearing connecting rod is rotatably connected to the stud body, and the other end is hinged to the gate.

[0006] Preferred technical solution of the present invention: The stud body is a hollow stud. The force-bearing connecting rod includes a main force-bearing shaft, a gate connecting shaft, and a universal shaft. The main force-bearing shaft is placed inside the hollow stud and is connected to the hollow stud through a self-aligning ball bearing. One end of the universal shaft is hingedly connected to the main force-bearing shaft, and the other end is hingedly connected to the gate connecting shaft.

[0007] Preferred technical solution of the present invention: The load-bearing nut includes at least two nut pieces. Each nut piece is provided with an internal thread matching the power stud. At least two nut pieces are fixed on the hydraulic structure, and their threaded surfaces form a stud lifting cavity matching the stud body. A limiting slideway is formed between adjacent two nut pieces. The stud body and the cage are both placed in the stud lifting cavity of the load-bearing nut. The external thread of the stud body is closely matched with the internal thread of the stud lifting cavity. The adjusting wheel of the cage moves along the limiting slideway between adjacent two nut pieces.

[0008] Preferred technical solution of the present invention: The power device includes a brake, a torque motor, and a reducer. The torque motor and the brake are integrated and have an on-line monitoring function. The actions of the torque motor and the brake are interlocked with the actions of the gate. The torque motor is connected to the frame bearing at the upper end of the stud body through the reducer and the power shaft.

[0009] Preferred technical solution of the present invention: The rotation direction of the power stud matches the rising or falling of the gate; the rotation speed is greater than the rising or falling speed of the gate.

[0010] Further technical solution of the present invention: The adjusting wheel includes a roller, a roller shaft, a roller frame, an adjusting screw, and a support frame. The roller is supported on the roller frame through the roller shaft. The tail end of the roller frame is bearing-connected with the adjusting screw. The adjusting screw can rotate in a threaded manner in the support frame, driving the roller frame to slide and adjusting the gap between the roller and the limiting slideway.

[0011] Preferred technical solution of the present invention: Inner rings of self-aligning ball bearings are respectively installed at both ends of the main force-bearing shaft of the force-bearing connecting rod. Outer rings of two self-aligning ball bearings are both installed inside the hollow stud of the power stud. Vibration damping springs are respectively installed at both ends of the main force-bearing shaft. The universal shaft adjusts its orientation all around.

[0012] Preferred technical solution of the present invention: There are two nut pieces. The two sides of each nut piece are smooth planes, and the plane angle is 90 degrees. The two nut pieces are symmetrically arranged, forming a stud lifting cavity therebetween. The upper and lower end faces of the stud lifting cavity are closed surfaces, and a force-bearing connecting rod perforation is provided on the lower end cover surface; The cage is a rectangular frame body, and adjusting wheels are respectively provided at the four corners of its upper and lower end faces. The width of the cage is smaller than the diameter of the stud body. When the cage is placed in the stud lifting cavity formed by the two nut pieces, the part of the stud body protruding from the cage is screwed and tightened with the internal thread of the nut piece, and the four adjusting wheels of the cage move up and down along the smooth planes on both sides of the two nut pieces respectively.

[0013] Preferred technical solution of the present invention: A force-bearing plate is welded on the back of each nut piece. Bolt holes are correspondingly provided on the nut piece and the force-bearing plate. The nut piece and the force-bearing plate are fixedly connected by a screw rod, and the force-bearing plate is integrally formed with the hydraulic building during pouring.

[0014] Preferred technical solution of the present invention: The inner ring of the frame bearing is fixedly installed on the stud body, and the outer ring of the frame bearing is fixedly installed on the upper and lower end faces of the cage.

[0015] The gate stepless locking device in the present invention includes a force-bearing connecting rod, a cage, a power stud, and a load-bearing nut. The lower end of the power stud is hinged to the gate through the force-bearing connecting rod. The power stud can move up and down in the load-bearing nut and stop at any time under the control of the power motor. Its power motor can be controlled by connecting to an external control terminal wirelessly or wired, generally by wireless control; The movement of the power stud is synchronized with the movement of the main force of the gate, and its movement speed is greater than the movement speed of the gate, which can provide safety protection in any state of the gate operation and lock in case of gate failure; The cage can ensure the normal movement of the stud along the nut and ensure the stability of the stud during the movement. The power of the power stud can be unlocked in time when the hollow stud and the force-bearing nut are reliably self-locked. The rotation direction is determined by the rise or fall of the gate, and the rotation speed is greater than the rise or fall speed of the gate; The torque motor and brake of the power stud have an on-line monitoring function. The actions of the torque motor and the brake are interlocked with the actions of the gate. Both its on-line monitoring function and interlocking function can be realized by existing technologies; The force-bearing connecting rod is installed in the stud body through a self-aligning ball bearing, and a damping spring is installed to reduce the vibration when the gate is locked and adapt to the change of the force direction of the universal shaft during the rise or fall operation of the gate. It can adjust the orientation in all directions and will not affect the normal opening of the gate during the rotation of the stud.

[0016] The present invention can lock the gate at any position within the opening range, greatly protecting the safety of the gate, solving the problem of the gate free-falling due to any failure of the gate hoist, reducing the vibration of the gate at any opening of the gate, and being applicable to the hoisting system of any form of gate hoist; the structure of the present invention is novel and reasonably designed, fully considering the equipment safety of water conservancy projects, enabling the gate to operate safely and effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the present invention;

[0018] Figure 2 is Figure 1 the sectional view AA' in

[0019] Figure 3 is the schematic diagram of the transverse section of the load-bearing nut in the present invention;

[0020] Figure 4 is Figure 3 the sectional view BB' in

[0021] Figure 5 is the connection schematic diagram of the power stud and the force-bearing connecting rod in the present invention;

[0022] Figure 6 is Figure 5 the top view of

[0023] Figure 7 is Figure 5 the sectional view CC' in

[0024] Figure 8 is the structural schematic diagram of the power stud in the present invention;

[0025] Figure 9 is the structural schematic diagram of the force-bearing connecting rod in the present invention;

[0026] Figure 10 is the elevation schematic diagram of the cage in the present invention;

[0027] Figure 11 is the plan schematic diagram of the cage in the present invention;

[0028] Figure 12 is the assembly drawing of the adjusting wheel in the present invention;

[0029] Figure 13 is the schematic diagram of the upward movement of the power stud in the present invention.

[0030] In the figure: 1 - gate, 2 - hydraulic structure, 3 - force - bearing connecting rod, 300 - main force - bearing shaft, 301 - gate connecting shaft, 302 - universal shaft, 303 - self - aligning ball bearing, 304 - damping spring, 4 - cage, 400 - adjusting wheel, 4001 - roller, 4002 - roller shaft, 4003 - roller frame, 4004 - adjusting screw, 4005 - support frame, 5 - power stud, 500 - power device, 5001 - brake, 5002 - torque motor, 5003 - reducer, 5004 - power shaft, 501 - stud body, 502 - frame bearing, 6 - load - bearing nut, 600 - nut piece, 601 - stud lifting cavity, 602 - force - bearing plate, 603 - screw, 7 - limit slideway. Detailed implementation manners

[0031] The present invention will be further described below with reference to the accompanying drawings. The Figures 1 to 13 are all drawings of the embodiments, which are drawn in a simplified manner and are only used to clearly and concisely illustrate the purpose of the embodiments of the present invention. The technical solutions shown in the drawings below are the specific solutions of the embodiments of the present invention and are not intended to limit the scope of the present invention claimed. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships when the product of the invention is normally placed, or the orientation or positional relationships commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0033] In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, terms such as "set" and "connect" should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] A stepless locking device for a gate provided in the embodiment, such as Figure 1 and Figure 2As shown, the stepless locking device includes a force-bearing connecting rod 3, a cage 4, a power stud 5, and a load-bearing nut 6. The load-bearing nut 6 is vertically fixed on the hydraulic structure 2, and its internal thread matches the external thread of the power stud 5. As Figure 3 and Figure 4 shown, the load-bearing nut 6 includes two nut pieces 600. The inner wall of each nut piece 600 is provided with an internal thread matching the power stud 5. The two sides of each nut piece 600 are smooth planes, and the plane angle is 90 degrees. The two nut pieces 600 are symmetrically arranged. A force-bearing plate 602 is welded to the back of each nut piece 600. Bolt holes are correspondingly provided on the nut piece 600 and the force-bearing plate 602. The nut piece 600 and the force-bearing plate 602 are fixedly connected by a screw 603. The force-bearing plate 602 and the hydraulic structure 2 are cast into an integral body. The threaded surfaces of the two nut pieces 600 form a stud lifting cavity 601 matching the stud body 501. The upper and lower end faces of the stud lifting cavity 601 are closed surfaces, and a force-bearing connecting rod through-hole is provided on the lower end cover surface. The two nut pieces 600 are both fixed on the hydraulic structure 2, and a limiting slideway 7 is formed between the adjacent smooth side surfaces of the two nut pieces 600. As Figure 8 shown, 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 provided at the upper and lower ends of the stud body 501; as Figure 11 and Figure 12 shown, the cage 4 is a rectangular frame body. The width of the cage 4 is smaller than the diameter of the stud body 501, and adjusting wheels 400 are respectively provided at the four corners of its upper and lower end faces; as Figure 5 shown, the stud body 501 is placed in the cage 4, and its upper and lower ends are respectively connected to the cage 4 through the frame bearings 502. The power device 500 is placed above the cage 4, and its output shaft is connected to the frame bearing 502 at the upper end of the stud body 501, and the power device 500 drives the stud body 501 to rotate in the cage 4. The inner ring of the frame bearing 502 is fixedly installed on the stud body 501, and the outer ring of the frame bearing 502 is fixedly installed on the upper and lower end faces of the cage 4, which can ensure that the cage 4 does not rotate when the stud body 501 rotates. As Figure 1As shown, the cage 4 and the power stud 5 are both placed in the stud lifting cavity 601 of the load-bearing nut 6. The part of the stud body 501 protruding from the cage 4 is in close fit with the internal thread of the nut piece 600. The four adjusting wheels 400 of the cage 4 move up and down along the smooth planes on both sides of the two nut pieces 600 respectively. One end of the force-bearing connecting rod 3 is rotatably connected to the stud body 501, and the other end is hinged to the gate 1. When the power device 500 drives the stud body 501 to rotate, the stud body 501 and the cage 4 move up and down along the threaded inner cavity of the load-bearing nut 6 and the limit slideway 7 respectively; the rotation direction of the power stud 5 matches the rising or falling of the gate 1; the rotation speed is greater than the rising or falling speed of the gate 1.

[0035] A stepless locking device for a gate provided in the embodiment, the force-bearing connecting rod 3 is as Figure 9 shown, including a main force-bearing shaft 300, a gate connecting shaft 301 and a universal shaft 302. One end of the universal shaft 302 is hinged to the main force-bearing shaft 300, and the other end is hinged to the gate connecting shaft 301; as Figure 5 shown, the main force-bearing shaft 300 is placed in a hollow stud and connected to the hollow stud through a self-aligning ball bearing 303; inner rings of self-aligning ball bearings 302 are respectively installed at both ends of the main force-bearing shaft 300, and outer rings of the two self-aligning ball bearings 302 are both installed inside the hollow stud of the power stud 5. Vibration damping springs 304 are respectively installed at both ends of the main force-bearing shaft 300 to reduce the vibration when the gate 1 is locked and adapt to the change of the force direction of the universal shaft 33 when the gate 1 rises or falls. The orientation of the universal shaft 302 is adjusted around.

[0036] The stepless locking device for a gate in the embodiment, as Figure 8 shown, 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 on-line monitoring function. The actions of the torque motor 5002 and the brake 5001 are interlocked with the action of the gate 1; the torque motor 5002 is connected to the frame bearing at the upper end of the stud body 501 through the speed reducer 5003 and the power shaft 5004. As Figure 12 shown, the adjusting wheel 400 includes a roller 4001, a roller shaft 4002, a roller frame 4003, an adjusting screw 4004 and a support frame 4005. The roller 4001 is supported on the roller frame 4003 through the roller shaft 4002. The tail end of the roller frame 4003 is bearing-connected with the adjusting screw 4004. The adjusting screw 4004 can rotate in a threaded manner in the support frame 4005 to drive the roller frame 4003 to slide and adjust the gap between the roller 4001 and the limit slideway 7.

[0037] In the stepless locking device of the present invention, the height of the load-bearing nut 6 is generally about 2 m, and the up-and-down movement stroke of the power stud 5 is 1.5 - 1.8 m. The specific working process is as follows:

[0038] Before the gate 1 is lifted and operated, the stepless locking device of the present invention is powered on. The torque motor 5002 and the brake 5001 are detected to be normal through on-line monitoring, and are controlled wirelessly or wiredly to issue an instruction to operate the gate 1. At this time, when the gate 1 is selected to be lifted, the torque motor 5002 of the stepless locking device drives the hollow stud body 501 to rotate through the reducer 5003. The rotation speed is greater than the lifting speed of the gate 1, so that the power stud 5 continuously rises in the load-bearing nut 6 until the main lifting mechanism of the gate 1 stops working.

[0039] On the contrary, before the gate 1 is lowered and operated, the stepless locking device is powered on. The torque motor 5002 and the brake 5001 are detected to be normal through on-line monitoring, and an instruction to operate the gate 1 is issued. At this time, when the gate 1 is selected to be lowered, the torque motor 5002 of the stepless locking device drives the hollow stud body 501 to rotate through the reducer 5003. The rotation speed is greater than the lowering speed of the gate 1, so that the power stud 5 continuously descends until the main lifting mechanism of the gate 1 stops working.

[0040] During the lifting or lowering process of the gate 1 in the present invention, if the main lifting mechanism suddenly fails, the torque motor 5002 of the stepless locking device at this time drives the hollow stud body 501 to still rotate through the reducer 5003. However, because the rotation speed is greater than the lowering speed of the gate 1, it will not cause the gate to fall out of control and present a free-fall phenomenon;

[0041] Before the gate 1 is lifted or lowered and operated, the stepless locking device is powered on. If the torque motor 5002 or the brake 5001 is detected to be abnormal through on-line monitoring, the system alarms and cuts off the power supply of the main lifting mechanism of the gate 1.

[0042] When the gate 1 is lifted or lowered to any opening degree and the power supply of the main lifting mechanism is cut off, the gate 1 is in a locked state at this opening degree. Because all components of the stepless locking device are rigid and there are damping springs inside, the vibration of the gate can be effectively reduced.

[0043] As described above, this is only one embodiment of the present invention, and its description is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A stepless locking device for a gate, characterized in that: The stepless locking device includes a stress connecting rod (3), a cage (4), a power stud (5) and a load-bearing nut (6); the power stud (5) includes a power device (500) and a stud body (501), and frame bearings (502) are respectively arranged at the upper and lower ends of the stud body (501). The stud body (501) is placed in the cage (4), and its upper and lower ends are respectively connected to the cage (4) through the frame bearings (502). The power device (500) is placed above the cage (4), and its output shaft is connected to the frame bearing at the upper end of the stud body (501), and drives the stud body (501) to rotate in the cage (4) through the power device (500); the load-bearing nut (6) is vertically fixed on the hydraulic structure (2), and its internal thread matches the external thread of the power stud (5). A limiting slideway (7) is vertically opened on the inner wall of the load-bearing nut (6). The load-bearing nut (6) includes at least two nut pieces (600). The inner wall of each nut piece (600) is provided with an internal thread matching the power stud (5). At least two nut pieces (600) are fixed on the hydraulic structure (2), and their threaded surfaces form a stud lifting cavity (601) matching the stud body (501). A limiting slideway (7) is formed between two adjacent nut pieces (600). The stud body (501) and the cage (4) are both placed in the stud lifting cavity (601) of the load-bearing nut (6). The external thread of the stud body (501) is tightly matched with the internal thread of the stud lifting cavity (601). The cage (4) is slidably connected to the limiting slideway (7) on the inner wall of the load-bearing nut (6) through an adjusting wheel (400). The adjusting wheel (400) of the cage (4) moves along the limiting slideway (7) between two adjacent nut pieces (600). When the power device (500) drives the stud body (501) to rotate, the stud body (501) and the cage (4) respectively move up and down along the threaded inner cavity and the limiting slideway (7) of the load-bearing nut (6); one end of the stress connecting rod (3) is rotatably connected to the stud body (501), and the other end is hinged to the gate (1); The adjusting wheel (400) includes a roller (4001), a roller shaft (4002), a roller frame (4003), an adjusting screw (4004) and a support frame (4005). The roller (4001) is supported on the roller frame (4003) through the roller shaft (4002). The tail end of the roller frame (4003) is bearing-connected with the adjusting screw (4004). The adjusting screw (4004) can be thread-rotated in the support frame (4005) to drive the roller frame (4003) to slide and adjust the gap between the roller (4001) and the limiting slideway (7).

2. The stepless locking device for a gate according to claim 1, characterized in that: The stud body (501) is a hollow stud. The force-bearing connecting rod (3) includes a main force-bearing shaft (300), a gate connecting shaft (301), and a universal shaft (302). The main force-bearing shaft (300) is placed inside the hollow stud and is connected to the hollow stud through a self-aligning ball bearing (303). One end of the universal shaft (302) is hinged to the main force-bearing shaft (300), and the other end is hinged to the gate connecting shaft (301).

3. A stepless locking device for a gate according to claim 1 or 2, characterized in that: The power device (500) includes a brake (5001), a torque motor (5002), and a reducer (5003). The torque motor (5002) and the brake (5001) are integrated and have an on-line monitoring function. The actions of the torque motor (5002) and the brake (5001) are interlocked with the actions of the gate (1). The torque motor (5002) is connected to the frame bearing at the upper end of the stud body (501) through the reducer (5003) and a power shaft (5004).

4. A stepless locking device for a gate according to claim 1 or 2, characterized in that: The rotation direction of the power stud (5) matches the rising or falling of the gate (1); the rotation speed is greater than the rising or falling speed of the gate (1).

5. The stepless locking device for a gate according to claim 2, wherein: Inner rings of self-aligning ball bearings (303) are respectively installed at both ends of the main force-bearing shaft (300) of the force-bearing connecting rod (3). Outer rings of the two self-aligning ball bearings (303) are both installed inside the hollow stud of the power stud (5). Vibration damping springs (304) are respectively installed at both ends of the main force-bearing shaft (300). The universal shaft (302) adjusts its orientation around it.

6. The stepless locking device for a gate according to claim 1 or 2, characterized in that: There are two nut pieces (600). Both sides of each nut piece (600) are smooth planes, and the plane angle is 90 degrees. The two nut pieces (600) are symmetrically arranged, forming a stud lifting cavity (601) therebetween. The upper and lower end faces of the stud lifting cavity (601) are closed surfaces, and a force-bearing connecting rod perforation is provided on the lower closed surface. The cage (4) is a rectangular frame body. Adjusting wheels (400) are respectively provided at the four corners of its upper and lower end faces. The width of the cage (4) is smaller than the diameter of the stud body (501). When the cage (4) is placed in the stud lifting cavity (601) formed by the two nut pieces (600), the protruding part of the stud body (501) from the cage (4) is screwed tightly with the internal thread of the nut piece (600). The four adjusting wheels (400) of the cage (4) respectively move up and down along the smooth planes on both sides of the two nut pieces (600).

7. A stepless locking device for a gate according to claim 1 or 2, characterized in that: A force-bearing plate (602) is welded to the back of each nut piece (600). Bolt holes are correspondingly provided on the nut piece (600) and the force-bearing plate (602). The nut piece (600) and the force-bearing plate (602) are fixedly connected through a screw (603). The force-bearing plate (602) is integrally formed with the hydraulic structure (2) by pouring.

8. The stepless locking device for a gate according to claim 3, wherein: The inner ring of the frame bearing (502) is fixedly installed on the stud body (501), and the outer ring of the frame bearing (502) is fixedly installed on the upper and lower end faces of the cage (4).

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