Combined bearing seat

Abstract

The invention relates to the technical field of bearing seats, in particular to a combined bearing seat. Guide rods are fixed to the four ends of the top end of the supporting base, the top ends of the outer sides of the guide rods are slidably connected with the adjusting base, a bearing lower cover is fixed to the top end of the adjusting base, a bearing upper cover is slidably connected to the top end of the bearing lower cover, and oil injection pipes are fixed to the two ends of the top end of the bearing upper cover; and the interiors of the bearing lower cover and the bearing upper cover are rotationally connected with rotating rollers. According to the combined type bearing seat, the rotating shaft is placed on the inner side of the bearing lower cover, then the bearing upper cover drives the limiting groove to be in sliding connection with the limiting block and the guide groove, then the rotating shaft is rotationally connected with the rotating roller, and the bearing lower cover and the bearing upper cover are combined through the combining mechanism; the bearing lower cover, the bearing upper cover and the rotating shaft can be conveniently disassembled and assembled, so that the device can be effectively disassembled and maintained through a combined mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing seats, and particularly relates to a combined bearing seat. Background Art

[0002] In mechanical equipment, bearings are very important components. Bearings mainly support the rotating bodies of machinery, reduce the friction coefficient during their movement, and ensure their rotational accuracy. A bearing seat is used to support the bearing. The bearing seat fixes the outer ring of the bearing, so that the outer ring remains stationary during the operation of the bearing, and only the inner ring rotates. Due to the strong integrity of the existing bearing seats, it is difficult to disassemble the bearings after they are fixed on the bearing seats. In this case, when the bearings are damaged, the bearing seats also need to be replaced, thus reducing the utilization rate of the bearing seats. Therefore, some detachable bearing seats have emerged today.

[0003] For example, patent (CN112145560B) discloses a combined porous bearing seat, which includes a mounting table, a fixing component, a fastening component, and a shock-absorbing component; Mounting table: A fixed arc groove is opened on the upper side surface, and an arc groove is opened in the middle of the fixed arc groove; Fixing component: Comprising a fixed barrel, an internal gear ring, a rotating shaft, an external gear ring, and an arc block. There are two fixed barrels, and both fixed barrels are fixed inside the fixed arc groove. A through hole is opened in the middle of the fixed barrel. An internal gear ring is rotatably connected between the two fixed barrels. The lower end of the internal gear ring is located inside the arc groove. The rear side wall inside the rear fixed barrel is rotatably connected with uniformly distributed rotating shafts, which has a shock-absorbing function, thus effectively improving the service life of the bearing, and making it very convenient to install and disassemble the bearing, so that when the bearing is damaged, it can be easily repaired, thereby improving the resource utilization rate and avoiding resource waste.

[0004] When using the above technology, it is found that the following technical problems exist in the prior art: The above bearing seat can be disassembled through the design of structures such as threaded rods and fastening nuts. However, when fixing the bearing, people need to tighten all four fastening nuts, which is not only very troublesome, but also the long-term screwing may cause thread slipping, thus making it inconvenient to quickly disassemble the bearing seat. Moreover, in the prior art, when the height of the bearing seat needs to be adjusted, therefore, to ensure the stability of the connection between the rotating shaft and other components, the height of the rotating shaft is lifted by adjusting the height of the bearing seat. For this reason, we design a combined bearing seat to provide another technical solution for the above technical problems. Summary of the Invention

[0005] Based on this, it is necessary to provide a combined bearing seat for the above technical problems. By placing the rotating shaft inside the lower bearing cover, and then driving the limiting groove, the limiting block and the guide groove to be slidably connected through the upper bearing cover, and then the rotating shaft is rotatably connected to the roller. The lower bearing cover and the upper bearing cover are combined through a combination mechanism to facilitate the disassembly and assembly of the lower bearing cover, the upper bearing cover and the rotating shaft. The lubricating oil is injected into the interiors of the lower bearing cover and the upper bearing cover along the oil injection pipe, and the adsorption sponge block effectively adsorbs and dissipates the lubricating oil, so that the combination mechanism can effectively disassemble and repair the device.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A combined bearing seat includes a support base. An adjusting seat is assembled at the top end of the support base. Guide rods are fixed at the four ends of the top end of the support base. The outer top ends of the guide rods are slidably connected to the adjusting seat. The top end of the adjusting seat is fixed with a lower bearing cover. An upper bearing cover is slidably connected to the top end of the lower bearing cover. Oil injection pipes are fixed at both ends of the top end of the upper bearing cover. Rollers are rotatably connected inside the lower bearing cover and the upper bearing cover. Combination mechanisms for disassembling the bearing seat are provided at both ends of the lower bearing cover and the upper bearing cover.

[0007] As a preferred embodiment of the combined bearing seat provided by the present invention, guide grooves are opened at both ends of the lower bearing cover, a limiting block is fixed at the top end of the lower bearing cover, limiting grooves are opened at both ends of the inner bottom end of the upper bearing cover, the two ends of the bottom end of the upper bearing cover are slidably connected to the guide grooves, and the top end of the limiting block is slidably connected to the limiting grooves.

[0008] As a preferred embodiment of the combined bearing seat provided by the present invention, adsorption sponge blocks are assembled inside the lower bearing cover and the upper bearing cover.

[0009] As a preferred embodiment of the combined bearing seat provided by the present invention, the combination mechanism includes a hand wheel, a lead screw and a rotating cylinder. Rotating cylinders are rotatably connected at both ends of the lower bearing cover. A lead screw is threadedly connected inside the rotating cylinder. One end of the lead screw away from the rotating cylinder is rotatably connected to a hand wheel. The outer side of the lead screw is slidably connected to the upper bearing cover.

[0010] As a preferred embodiment of the combined bearing seat provided by the present invention, a gasket is slidably connected to the end of the outer side of the lead screw away from the rotating cylinder. The bottom end of the gasket is slidably connected to the upper bearing cover. The bottom end of the hand wheel is slidably connected to the gasket.

[0011] As a preferred embodiment of the combined bearing seat provided by the present invention, the connection between the top end of the lead screw and the hand wheel deviates from the center of the hand wheel.

[0012] As a preferred embodiment of the combined bearing seat provided by the present invention, a lifting mechanism for adjusting the bearing lower cover and the bearing upper cover is arranged between the support base and the adjusting seat. The lifting mechanism includes a slide bar, a rotating sleeve, a positive and negative threaded rod, a ratchet wheel and a limiting component. Both ends of the mutually approaching ends of the support base and the adjusting seat are slidably connected with slide bars. A rotating sleeve is rotatably connected to the outer side of the slide bar. Two cross arms are rotatably and crosswise connected between the support base and the adjusting seat. Both ends of the cross arm are respectively fixed to the rotating sleeve.

[0013] As a preferred embodiment of the combined bearing seat provided by the present invention, a lifting mechanism for adjusting the bearing lower cover and the bearing upper cover is arranged between the support base and the adjusting seat. The lifting mechanism includes a slide bar, a rotating sleeve, a positive and negative threaded rod, a ratchet wheel and a limiting component. Both ends of the mutually approaching ends of the support base and the adjusting seat are slidably connected with slide bars. A rotating sleeve is rotatably connected to the outer side of the slide bar. Two cross arms are rotatably and crosswise connected between the support base and the adjusting seat. Both ends of the cross arm are respectively fixed to the rotating sleeve.

[0014] As a preferred embodiment of the combined bearing seat provided by the present invention, a positive and negative threaded rod is rotatably connected to the top end of the support base. Sliders are threadedly connected to both ends of the outer side of the positive and negative threaded rod. The top ends and the bottom ends of the sliders are fixed to two cross arms. A ratchet wheel is fixed to one end of the positive and negative threaded rod.

[0015] As a preferred embodiment of the combined bearing seat provided by the present invention, a limiting mechanism for positioning the positive and negative threaded rod is arranged at one end of the support base. The limiting mechanism includes a pawl and a spring. A pawl is rotatably connected to one end of the support base. The top end of the pawl is clamped with the ratchet wheel. A spring is fixed to the outer side of the pawl. The end of the spring away from the pawl is fixed to the support base.

[0016] It can be undoubtedly seen that through the above technical solutions of the present application, the technical problems to be solved by the present application can surely be solved.

[0017] Meanwhile, through the above technical solutions, the present invention has at least the following beneficial effects: For the combined bearing seat provided by the present invention, when the bearing upper cover and the bearing lower cover are clamped, at this time, rotating the screw rod drives the rotating cylinder to be slidably connected with the bearing upper cover, and the screw rod drives the gasket to slide with the bearing upper cover. Then, rotating the hand wheel to squeeze the gasket. At this time, the gasket squeezes the bearing upper cover, so that the bearing lower cover and the bearing upper cover are quickly combined, thus facilitating the disassembly and maintenance of the adjusting seat and the bearing lower cover. Rotate the ratchet wheel to drive the left - hand and right - hand threaded rod to rotate, so that the left - hand and right - hand threaded rod drives the two sliders to squeeze towards each other. The sliders press on the bottom ends of the two cross arms, and the sliders slide along the length of the support base for guiding, so that the top ends of the two cross arms squeeze and slide the adjusting seat, thereby effectively adjusting the heights of the bearing lower cover, the bearing upper cover and the rotating shaft. Then, the elastic force of the spring drives the pawl to engage with the ratchet wheel, thereby effectively limiting the ratchet wheel, so as to improve the stability of the bearing lower cover, the bearing upper cover and the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the front structural schematic diagram of the whole of the present invention; Figure 3 is the side structural schematic diagram of the whole of the present invention; Figure 4 is the structural schematic diagram between the bearing lower cover and the bearing upper cover of the present invention; Figure 5 is the structural schematic diagram of the combined mechanism of the present invention; Figure 6 is the internal structural schematic diagram of the bearing lower cover and the bearing upper cover of the present invention; Figure 7 is the structural schematic diagram between the bearing upper cover and the guide groove of the present invention; Figure 8 is the internal structural schematic diagram of the lifting adjustment of the present invention; Figure 9 is the structural schematic diagram between the left - hand and right - hand threaded rod and the slider of the present invention; Figure 10 is the structural schematic diagram of the engagement between the ratchet wheel and the pawl of the present invention.

[0020] In the figure: 1, support base; 2, adjusting seat; 3, bearing lower cover; 4, bearing upper cover; 5, oil injection pipe; 6, guide rod; 7, slider; 8, left - hand and right - hand threaded rod; 9, hand - turning wheel; 10, gasket; 11, adsorption sponge block; 12, roller; 13, lead screw; 14, rotating cylinder; 15, guide groove; 16, limit groove; 17, limit block; 18, ratchet wheel; 19, sliding rod; 20, rotating sleeve; 21, pawl; 22, cross arm; 23, spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0023] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] Embodiment 1 Please refer to Figures 1 - 7 , a combined bearing seat, including a support base 1, an adjustment seat 2 is assembled at the top of the support base 1, guide rods 6 are fixed at the four ends of the top of the support base 1, the top of the outer side of the guide rod 6 is slidably connected with the adjustment seat 2, a bearing lower cover 3 is fixed at the top of the adjustment seat 2, a bearing upper cover 4 is slidably connected to the top of the bearing lower cover 3, oil injection pipes 5 are fixed at both ends of the top of the bearing upper cover 4, rollers 12 are rotatably connected inside the bearing lower cover 3 and the bearing upper cover 4, adsorption sponge blocks 11 are assembled on the inner sides of the bearing lower cover 3 and the bearing upper cover 4, and combined mechanisms for disassembling the bearing seat are arranged at both ends of the bearing lower cover 3 and the bearing upper cover 4; When in use, by placing the rotating shaft inside the bearing lower cover 3, and then driving the limit groove 16 to be slidably connected with the limit block 17 and the guide groove 15 through the bearing upper cover 4, and then the rotating shaft is rotatably connected with the roller 12. The bearing lower cover 3 and the bearing upper cover 4 are combined through the combined mechanism, so as to facilitate the disassembly and assembly of the bearing lower cover 3, the bearing upper cover 4 and the rotating shaft. And the lubricating oil is injected into the bearing lower cover 3 and the bearing upper cover 4 along the oil injection pipe 5, and the adsorption sponge block 11 effectively adsorbs and dissipates the lubricating oil, so that the combined mechanism effectively disassembles and repairs the device; Guide grooves 15 are opened at both ends of the bearing lower cover 3, a limit block 17 is fixed at the top of the bearing lower cover 3, limit grooves 16 are opened at both ends of the inner bottom of the bearing upper cover 4, the two ends of the bottom of the bearing upper cover 4 are slidably connected with the guide grooves 15, and the top of the limit block 17 is slidably connected with the limit grooves 16; Specifically, the bearing lower cover 3 and the bearing upper cover 4 are slidably connected, and the limit block 17 and the limit groove 16 are slidably connected in alignment, so as to improve the stability between the bearing lower cover 3 and the bearing upper cover 4; The combined mechanism includes a hand wheel 9, a lead screw 13 and a rotating cylinder 14. Rotating cylinders 14 are rotatably connected to both ends of the bearing lower cover 3. A lead screw 13 is threadedly connected inside the rotating cylinder 14. One end of the lead screw 13 away from the rotating cylinder 14 is rotatably connected to a hand wheel 9. The outer side of the lead screw 13 is slidably connected to the bearing upper cover 4. A gasket 10 is slidably connected to the outer side of the lead screw 13 away from the rotating cylinder 14. The bottom end of the gasket 10 is slidably connected to the bearing upper cover 4. The bottom end of the hand wheel 9 is slidably connected to the gasket 10. The connection between the top end of the lead screw 13 and the hand wheel 9 deviates from the center of the hand wheel 9. Specifically, when the shaft needs to be installed, the shaft is placed inside the bearing lower cover 3. Then, it is necessary to quickly assemble the bearing lower cover 3 and the bearing upper cover 4. At this time, when the bearing upper cover 4 is snap-connected to the bearing lower cover 3, the lead screw 13 is rotated to drive the rotating cylinder 14 to be slidably connected to the bearing upper cover 4, and the lead screw 13 drives the gasket 10 to slide with the bearing upper cover 4. Then, the hand wheel 9 is rotated to squeeze the gasket 10. At this time, the gasket 10 squeezes the bearing upper cover 4, so that the bearing lower cover 3 and the bearing upper cover 4 are quickly combined, facilitating the disassembly and repair of the adjusting seat 2 and the bearing lower cover 3.

[0026] Embodiment 2 Please refer to Figures 8 - 10 , a combined bearing seat. A lifting mechanism for adjusting the bearing lower cover 3 and the bearing upper cover 4 is provided between the support base 1 and the adjusting seat 2. The lifting mechanism includes a slide bar 19, a rotating sleeve 20, a left-right threaded rod 8, a ratchet wheel 18 and a limiting component. Slide bars 19 are slidably connected to both ends of the mutually close ends of the support base 1 and the adjusting seat 2. A rotating sleeve 20 is rotatably connected to the outer side of the slide bar 19. Two cross arms 22 are cross-rotatably connected between the support base 1 and the adjusting seat 2. Both ends of the cross arm 22 are respectively fixed to the rotating sleeve 20. The middle parts of the two cross arms 22 are rotatably connected to each other. A left-right threaded rod 8 is rotatably connected to the top end of the support base 1. Sliders 7 are threadedly connected to both ends of the outer side of the left-right threaded rod 8. The top and bottom ends of the slider 7 are fixed to the two cross arms 22. A ratchet wheel 18 is fixed to one end of the left-right threaded rod 8. Specifically, when the height of the bearing lower cover 3, the bearing upper cover 4 and the shaft needs to be adjusted, the ratchet wheel 18 is rotated at this time to drive the left-right threaded rod 8 to rotate, so that the left-right threaded rod 8 drives the two sliders 7 to squeeze in the direction of approaching each other. The slider 7 presses on the bottom ends of the two cross arms 22, and the slider 7 slides along the length of the support base 1 for guiding, so that the top ends of the two cross arms 22 press and slide on the adjusting seat 2, effectively adjusting the height of the bearing lower cover 3, the bearing upper cover 4 and the shaft. One end of the support base 1 is provided with a limiting mechanism for clamping the positive and negative threaded rod 8. The limiting mechanism includes a pawl 21 and a spring 23. One end of the support base 1 is rotatably provided with the pawl 21. The top end of the pawl 21 is clamped with the ratchet wheel 18. A spring 23 is fixed to the outside of the pawl 21. One end of the spring 23 away from the pawl 21 is fixed to the support base 1. Further, when the ratchet wheel 18 drives the positive and negative threaded rod 8 to rotate, and the positive and negative threaded rod 8 drives two sliders 7 to press on two cross arms 22, so that the cross arms 22 drive the bearing lower cover 3, the bearing upper cover 4 and the rotating shaft to adjust the height. At this time, in order to prevent the positive and negative threaded rod 8 from reversing, at this time, the elasticity of the spring 23 drives the pawl 21 to be clamped with the ratchet wheel 18, so as to effectively limit the ratchet wheel 18, so as to improve the stability of the bearing lower cover 3, the bearing upper cover 4 and the rotating shaft. When it is necessary to rotate the ratchet wheel 18, at this time, rotate the ratchet wheel 18 counterclockwise to drive the positive and negative threaded rod 8 to rotate, and the positive and negative threaded rod 8 drives the slider 7 to move, and the slider 7 drives the bearing lower cover 3, the bearing upper cover 4 and the rotating shaft to adjust. At this time, the ratchet wheel 18 and the pawl 21 slide.

[0027] The use process of a combined bearing seat provided by the present invention is as follows: Place the rotating shaft inside the bearing lower cover 3 to ensure that the contact surface between the roller 12 and the rotating shaft matches. Slide the bearing upper cover 4 so that the limiting groove 16 is accurately aligned with the limiting block 17 of the bearing lower cover 3. Then rotate the screw rod 13 and the rotating cylinder 14 for adjustment, so as to adjust according to the distance between the bearing lower cover 3 and the bearing upper cover 4. Then rotate the hand wheel 9 to push and squeeze the gasket 10, so that the gasket 10 presses down the bearing upper cover 4, and the upper and lower covers are quickly tightened through the thread self-locking effect. By rotating the ratchet wheel 18 counterclockwise, the positive and negative threaded rod 8 is driven to rotate, driving the two sliders 7 to synchronously move towards the center along the support base 1. The slider 7 presses the bottom end of the cross arm 22, forcing the top of the cross arm group to unfold, and pushing the adjusting seat 2 to vertically rise along the guide rod 6, so as to adjust the height of the bearing lower cover 3 and the bearing upper cover 4. Finally, the pawl 21 is clamped with the tooth surface of the ratchet wheel 18 under the elastic force of the spring 23, preventing the positive and negative threaded rod 8 from reversing accidentally and ensuring the stability of the lifting position.

[0028] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, according to the content of this specification, many modifications and changes can be made. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art in the technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A combined bearing seat, characterized in that: The invention comprises a support base (1), the top of the support base (1) is equipped with an adjustment seat (2), the four ends of the top of the support base (1) are fixed with guide rods (6), the top of the outer side of the guide rods (6) is slidably connected to the adjustment seat (2), the top of the adjustment seat (2) is fixed with a bearing lower cover (3), the top of the bearing lower cover (3) is slidably connected to a bearing upper cover (4), the two ends of the top of the bearing upper cover (4) are fixed with oil injection pipes (5), the insides of the bearing lower cover (3) and the bearing upper cover (4) are rotatably connected with rollers (12), and both ends of the bearing lower cover (3) and the bearing upper cover (4) are provided with a combination mechanism for disassembling the bearing seat.

2. A combined bearing seat according to claim 1, characterized in that: Guide grooves (15) are provided at both ends of the bearing lower cover (3), a limit block (17) is fixed at the top end of the bearing lower cover (3), and limit grooves (16) are provided at both ends of the bottom end of the bearing upper cover (4), both ends of the bottom end of the bearing upper cover (4) are slidably connected to the guide grooves (15), and the top end of the limit block (17) is slidably connected to the limit groove (16).

3. A combined bearing seat according to claim 2, characterized in that: Adsorption sponge blocks (11) are mounted on the inner sides of the bearing lower cover (3) and the bearing upper cover (4).

4. A combined bearing seat according to claim 2, characterized in that: The combined mechanism comprises a hand-turned wheel (9), a screw rod (13) and a rotating drum (14); both ends of the bearing lower cover (3) are rotatably connected to the rotating drum (14); the internal thread of the rotating drum (14) is connected to the screw rod (13); one end of the screw rod (13) away from the rotating drum (14) is rotatably connected to the hand-turned wheel (9); and the outer side of the screw rod (13) is slidably connected to the bearing upper cover (4).

5. A combined bearing seat according to claim 4, characterized in that: A gasket (10) is slidably connected to one end of the outer side of the screw rod (13) away from the rotating drum (14), the bottom end of the gasket (10) is slidably connected to the bearing upper cover (4), and the bottom end of the hand wheel (9) is slidably connected to the gasket (10).

6. A combined bearing seat according to claim 5, characterized in that: The connection point between the top end of the screw rod (13) and the hand wheel (9) deviates from the center of the hand wheel (9).

7. The combined bearing seat according to claim 2, characterized in that: A lifting mechanism for adjusting the bearing lower cover (3) and the bearing upper cover (4) is arranged between the support base (1) and the adjustment seat (2), and the lifting mechanism comprises a slide bar (19), a rotating sleeve (20), a positive and negative threaded rod (8), a ratchet (18) and a limit assembly. Both ends of the end where the support base (1) and the adjustment seat (2) are close to each other are slidably connected to the slide bar (19), and the outer side of the slide bar (19) is rotatably connected to the rotating sleeve (20). Two cross arms (22) are rotatably connected to each other between the support base (1) and the adjustment seat (2), and both ends of the cross arms (22) are respectively fixed to the rotating sleeve (20).

8. The combined bearing seat according to claim 7, characterized in that: A lifting mechanism for adjusting the bearing lower cover (3) and the bearing upper cover (4) is arranged between the support base (1) and the adjustment seat (2), and the lifting mechanism comprises a slide bar (19), a rotating sleeve (20), a positive and negative threaded rod (8), a ratchet (18) and a limit assembly. Both ends of the end where the support base (1) and the adjustment seat (2) are close to each other are slidably connected to the slide bar (19), and the outer side of the slide bar (19) is rotatably connected to the rotating sleeve (20). Two cross arms (22) are rotatably connected to each other between the support base (1) and the adjustment seat (2), and both ends of the cross arms (22) are respectively fixed to the rotating sleeve (20).

9. A combined bearing seat according to claim 8, characterized in that: The top end of the support base (1) is rotatably connected to a forward and reverse threaded rod (8), the two ends of the outer side of the forward and reverse threaded rod (8) are threadedly connected to a slider (7), the top end and two cross arms (22) at the bottom end of the slider (7) are fixed, and one end of the forward and reverse threaded rod (8) is fixed to a ratchet (18).

10. The combined bearing seat according to claim 8, characterized in that: A limiting mechanism for locking the forward and reverse threaded rods (8) is provided at one end of the support base (1), the limiting mechanism comprising a pawl (21) and a spring (23); a pawl (21) is rotatably mounted at one end of the support base (1); the top end of the pawl (21) is locked with the ratchet wheel (18); a spring (23) is fixed to the outside of the pawl (21); and an end of the spring (23) away from the pawl (21) is fixed to the support base (1).

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