Dual-protection self-locking device of light jack

Abstract

The invention discloses a dual-protection self-locking device of a light jack. The dual-protection self-locking device comprises a rack; the basic brake structure is arranged on the rack and is used for realizing braking of the equipment under a normal working condition; the long shaft is transversely arranged on the rack in a penetrating manner; the rotating disc is fixedly connected with the long shaft and can synchronously rotate along with the long shaft, and a movable groove is formed in the rotating disc; the brake sliding block is movably arranged in the movable groove, the brake sliding block can completely retract into the movable groove in a normal state, and when the rotating speed of the long shaft is higher than a preset rotating speed threshold value, at least one part of the brake sliding block is thrown out of the movable groove; the blocking part is arranged on the rack, surrounds the periphery of the rotating disc and is used for friction braking with part of the braking sliding block thrown out of the movable groove; and the pre-tightening part is arranged between the braking sliding block and the rotating disc and is used for providing continuous centripetal pre-tightening force for the braking sliding block, so that the braking sliding block is always contracted in the movable groove when the rotating speed of the long shaft is lower than a preset rotating speed threshold value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light hoist, in particular to a double protection self-locking device of light hoist. BACKGROUND

[0002] In the field of power, communication and other outdoor construction, light hoist, namely hand-operated hoist, is a very important tool. At present, such equipment generally uses a single active brake device to ensure safety and prevent cable rebound.

[0003] However, in a complex outdoor working environment, the active brake device may fail due to long-term high-load use, lack of timely maintenance, natural wear and tear of parts, or sudden mechanical failure. Once this only protection device fails, the cable being tensioned will lose its restraint, causing the load to lose control and drop or rebound violently. This not only causes damage to expensive equipment, but also poses a serious threat to the personal safety of on-site operators, and can easily cause serious personnel casualties.

[0004] Therefore, there is an urgent need in the art for a solution that can provide redundant safety protection for light hoist The above content is only used to assist in understanding the technical solutions of the present application, and does not mean that the above content is the closest prior art to the present application. SUMMARY

[0005] Based on this, the present application provides a double protection self-locking device of light hoist to solve one of the above technical problems.

[0006] The technical solution adopted by the present application to solve its technical problems is a double protection self-locking device of light hoist, comprising: a rack; a base brake structure arranged on the rack for braking in normal working conditions of the device; a long shaft transversely arranged in the rack; a rotating disc fixedly connected with the long shaft and capable of rotating synchronously with the long shaft, the rotating disc being provided with a movable slot; a brake sliding block movably arranged in the movable slot, the brake sliding block being completely retracted into the movable slot in normal state, and at least a part of the brake sliding block being thrown out of the movable slot when the rotating speed of the long shaft is higher than a preset rotating speed threshold; a blocking portion arranged on the rack and surrounding the periphery of the rotating disc for friction braking with the part of the brake sliding block thrown out of the movable slot; and a pre-tightening portion arranged between the brake sliding block and the rotating disc for providing the brake sliding block with a continuous centripetal pre-tightening force, so that the brake sliding block is always retracted in the movable slot when the rotating speed of the long shaft is lower than the preset rotating speed threshold.

[0007] In some embodiments, the rack includes a rotating disc seat provided with a rotating disc slot, and the rotating disc is rotatably embedded in the rotating disc slot.

[0008] In some embodiments, a blocking groove is provided on one side of the periphery of the turntable groove, and the blocking part is a portion of the inner wall of the blocking groove.

[0009] In some embodiments, a reset button is provided on the blocking groove. The reset button is exposed on the frame, and its side near the brake slider can push the ejected brake slider back into the movable groove.

[0010] In some embodiments, an abutment block is provided in the blocking groove, a mating groove is provided on the reset button, and a first spring is provided between the abutment block and the inner wall of the mating groove.

[0011] In some embodiments, the brake slider is provided with a brake end, and there is an angle between the two sides of the brake end and the brake slider, the angle corresponding to the blocking part.

[0012] In some embodiments, the brake slider is provided with an extension end. When the rotational speed of the long shaft is higher than a preset rotational speed threshold, the brake slider will rotate along the end of the extension end and cause the brake end to be thrown out.

[0013] In some embodiments, the preload includes a second spring and a ball bearing. The second spring is disposed within the brake slider and is used to drive the ball bearing to move towards the bottom of the movable groove.

[0014] In some embodiments, the bottom of the movable groove is provided with a ball groove adapted to the ball, which is used to cooperate with the ball to provide a stronger preload when the brake slider is fully retracted into the movable groove.

[0015] In some embodiments, one side of the turntable where the brake slider is located is connected to a cover plate by screws, and one side of the second spring abuts against the cover plate.

[0016] The beneficial effects of this application are as follows: by having the basic brake and the centrifugal self-locking mechanism work independently, the self-locking device is triggered instantly when the brake fails, completely avoiding safety accidents caused by load runaway. In addition, the bidirectional positioning design of the pre-tightening part and the ball groove prevents accidental triggering under harsh working conditions. The brake slider will be thrown out of the movable groove due to the high-speed rotation of the long shaft and cooperate with the blocking part to limit the movement, ensuring that it can be locked quickly when the light lifting device is out of control. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of this application.

[0019] Figure 2 This is a schematic diagram of the exploded structure of this application.

[0020] Figure 3 This is a schematic diagram of the exploded structure of the turntable base in this application.

[0021] Figure 4 This is a schematic diagram of the braking state of the brake slider in this application.

[0022] Figure 5 This is a schematic diagram of the brake slider in the non-braking state of this application.

[0023] Explanation of reference numerals: 1. Frame; 11. Turntable base; 111. Turntable groove; 112. Blocking groove; 12. Reset button; 121. Mating groove; 13. Abutting block; 14. First spring; 2. Basic brake structure; 3. Long shaft; 4. Turntable; 41. Movable groove; 411. Ball groove; 42. Cover plate; 5. Brake slider; 51. Braking end; 52. Extension end; 6. Blocking part; 7. Preload part; 71. Second spring; 72. Ball. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of this application.

[0025] In the embodiments of this application, please refer to Figures 1-5As shown, this application provides a dual-protection self-locking device for a lightweight crane, mainly comprising: a frame 1; a basic brake structure 2, mounted on the frame 1, used to achieve braking under normal operating conditions; a long shaft 3, transversely passing through the frame 1; a turntable 4, fixedly connected to the long shaft 3 and capable of rotating synchronously with the long shaft 3, the turntable 4 having a movable groove 41; a brake slider 5, movably mounted within the movable groove 41, the brake slider 5 normally retracting completely into the movable groove 41, and when the rotational speed of the long shaft 3 exceeds a preset speed threshold, at least a portion of the brake slider 5 is thrown out of the movable groove 41; a blocking part 6, mounted on the frame 1 and surrounding the turntable 4, used for friction braking with the portion of the brake slider 5 thrown out of the movable groove 41; and a pre-tightening part 7, mounted between the brake slider 5 and the turntable 4, used to provide a continuous centripetal pre-tightening force to the brake slider 5, so that the brake slider 5 is always retracted within the movable groove 41 when the rotational speed of the long shaft 3 is below the preset speed threshold.

[0026] Specifically, under normal operating conditions, the basic brake structure 2 works independently, and the crane's conventional braking is achieved through manual operation. The brake slider 5 remains in the retracted state, and the rotation of the turntable 4 has no effect on the rotation of the long shaft 3. When the basic brake structure 2 fails or is not activated, the sprocket in the housing drives the long shaft 3 to rotate at overspeed. When the speed reaches the preset threshold, the brake slider 5 overcomes the centrifugal preload of the preload part 7 and is thrown out by centrifugal force, rubbing against the blocking part 6 to brake, thus stopping the long shaft 3 from rotating.

[0027] The following will continue to describe some preferred / improved embodiments based on the above embodiments. Any one of the following embodiments can be selected, or multiple embodiments can be combined.

[0028] Specifically, the frame 1 includes a turntable base 11, on which a turntable groove 111 is provided. The turntable 4 is rotatably embedded in the turntable groove 111, and the diameter of the turntable groove 111 is clearance-fitted with the outer diameter of the turntable 4.

[0029] Reference Figures 4-5 As shown, a blocking groove 112 is provided on one side of the outer periphery of the turntable groove 111. The blocking part 6 is a part of the inner wall of the blocking groove 112. The inner wall of the blocking groove 112 near the turntable 4 is an arc-shaped structure, which is consistent with the arc of the outer wall of the turntable 4. This arc-shaped inner wall is the blocking part 6.

[0030] Referring to Figures 3-5, a reset button 12 is provided on the blocking groove 112. The reset button 12 is exposed on the frame 1 for easy manual operation. One end of the button, near the brake slider 5, extends into the blocking groove 112, and the end face on this side is an arc-shaped contact surface. When the brake slider 5 is thrown out and brakes against the blocking part 6, the equipment stops. The operator can manually press the reset button 12, and the end of the reset button 12 will push the thrown-out brake slider 5 back along the trajectory of the movable groove 41 to the fully retracted state, thus completing the reset without disassembling the equipment.

[0031] Reference Figure 3 As shown, an abutment block 13 is provided in the blocking groove 112, and a mating groove 121 is provided on the reset button 12. A first spring 14 is provided between the abutment block 13 and the inner wall of the mating groove 121. Under normal conditions, the first spring 14 is in an extended state. When the reset button 12 is manually pressed to push the brake slider 5 back, and the button is released, the elastic force of the first spring 14 drives the reset button 12 to automatically reset, waiting for the next use.

[0032] Preferably, the brake slider 5 is provided with a brake end 51, and there is an angle between the two sides of the brake end 51 and the brake slider 5. This angle corresponds to the blocking part 6, and the angle allows the brake slider 5 to be adapted to the arc-shaped structure of the blocking part 6 when it is braked.

[0033] Reference Figures 4-5 As shown, the brake slider 5 is provided with an extension end 52. When the rotational speed of the long shaft 3 is higher than the preset speed threshold, the brake slider 5 will rotate along the end of the extension end 52 and cause the brake end 51 to be thrown out. The extension end 52 is generally long and narrow, and the cross-section at the end is partially circular. When the rotational speed of the long shaft 3 is higher than the preset threshold, the brake slider 5 will rotate along the inner wall of the movable groove 41 with the end of the extension end 52 as the fulcrum, thereby driving the brake end 51 to be thrown out of the movable groove 41 quickly and smoothly, and to contact the blocking part 6 to achieve braking.

[0034] Reference Figure 3 As shown, the preload part 7 includes a second spring 71 and a ball bearing 72. The second spring 71 is disposed inside the brake slider 5 and drives the ball bearing 72 to continuously move towards the bottom of the movable groove 41. Under normal conditions, the ball bearing 72 is in contact with the bottom of the movable groove 41, and the second spring 71 is in a compressed state. The ball bearing 72 applies a continuous centripetal preload force to the brake slider 5, ensuring that the brake slider 5 retracts into the movable groove 41. It should also be noted that preload structures such as ball screws can also complete this preload step.

[0035] Preferably, the bottom of the movable groove 41 is provided with a ball groove 411 adapted to the ball 72, which is used to provide a stronger preload force when the brake slider 5 is fully retracted into the movable groove 41. When the brake slider 5 is fully retracted into the movable groove 41, the second spring 71 drives the ball 72 to embed into the ball groove 411, ensuring the stability of the brake slider 5 under normal working conditions.

[0036] Specifically, the turntable 4 has a cover plate 42 connected to one side of the brake slider 5 by four evenly distributed screws. The cover plate 42 can restrict the brake slider 5 from axially disengaging, and one side of the second spring 71 abuts against the cover plate 42 to facilitate the application of a centripetal preload to the ball 72.

[0037] The various embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of this application. The foregoing embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A dual-protection self-locking device for a lightweight lifting device, characterized in that, include: frame; A basic braking structure is installed on the frame to achieve braking under normal operating conditions of the equipment; The long axis extends laterally through the frame; A turntable is fixedly connected to a long shaft and can rotate synchronously with the long shaft. The turntable is provided with a movable groove. The brake slider is movably disposed within the movable groove. Under normal conditions, the brake slider is completely retracted into the movable groove. When the rotational speed of the long shaft exceeds a preset speed threshold, at least a portion of the brake slider is thrown out of the movable groove. A blocking part is provided on the frame and surrounds the turntable, and is used to brake the part of the brake slider that is thrown out of the movable groove by friction. A preload section is provided between the brake slider and the turntable to provide a continuous centripetal preload to the brake slider, so that the brake slider is always contracted in the movable groove when the rotational speed of the long shaft is lower than a preset speed threshold.

2. The dual-protection self-locking device for a lightweight lifting device according to claim 1, characterized in that, The frame includes a turntable base with a turntable groove, and the turntable is rotatably embedded in the turntable groove.

3. The dual-protection self-locking device for a lightweight lifting device according to claim 2, characterized in that, A blocking groove is provided on one side of the outer periphery of the turntable groove, and the blocking part is a portion of the inner wall of the blocking groove.

4. The dual-protection self-locking device for a lightweight lifting device according to claim 3, characterized in that, A reset button is provided on the blocking groove. The reset button is exposed on the frame, and its side near the brake slider can push the ejected brake slider back into the movable groove.

5. The dual-protection self-locking device for a lightweight lifting device according to claim 4, characterized in that, An abutment block is provided in the blocking groove, and a mating groove is provided on the reset button. A first spring is provided between the abutment block and the inner wall of the mating groove.

6. The dual-protection self-locking device for a lightweight lifting device according to claim 1, characterized in that, The brake slider is provided with a brake end, and there is an angle between the two sides of the brake end and the brake slider, which corresponds to the blocking part.

7. The dual-protection self-locking device for a lightweight lifting device according to claim 6, characterized in that, The brake slider is provided with an extension end. When the rotational speed of the long shaft is higher than the preset rotational speed threshold, the brake slider will rotate along the end of the extension end and cause the brake end to be thrown out.

8. The dual-protection self-locking device for a lightweight lifting device according to claim 1, characterized in that, The preload includes a second spring and a ball bearing. The second spring is disposed inside the brake slider and is used to drive the ball bearing to move towards the bottom of the movable groove.

9. The dual-protection self-locking device for a lightweight lifting device according to claim 8, characterized in that, The bottom of the movable groove is provided with a ball groove that is adapted to the ball, which is used to cooperate with the ball to provide a stronger preload when the brake slider is fully retracted into the movable groove.

10. A dual-protection self-locking device for a lightweight crane according to claim 8, wherein a cover plate is connected to one side of the turntable where a brake slider is provided by screws, and one side of the second spring abuts against the cover plate.

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