A kind of anti-falling structure for pulley block

Abstract

The utility model relates to a kind of anti-falling structure for pulley block, including driving gear, driven gear and driven gear shaft and first anti-falling mechanism;The first anti-falling mechanism includes compression spring and one-way tooth;One end of the one-way tooth is rotating end, one end is free end, the rotating end is set on the shell by rotating shaft, the free end of the one-way tooth and shell inner wall are equipped with compression spring, the gear on the one-way tooth is set in free end, gear is towards driven gear and is engaged with driven gear.The setting of two first anti-falling mechanisms, when driving gear is damaged, effectively avoid driven gear shaft driving rope wheel reverse direction operation, avoid the rapid loosening of rope on rope;When driving gear and two first anti-falling mechanisms are damaged, through second anti-falling mechanism, avoid driven gear shaft driving rope wheel reverse direction operation, avoid the situation that pulley block rapid sliding brings security risk to high-altitude work personnel occurs, greatly increase the safety protection performance of pulley block.

Description

Technical Field

[0001] This utility model relates to a fall protection structure, and more particularly to a fall protection structure for a pulley system. Background Technology

[0002] In the current high-altitude work industry, the main method used is to manually descend to the working height using safety ropes. The entire process is difficult and dangerous, and requires high skills from the operators. Against this background, a multi-functional pulley system was developed. It uses an electric drill as a power source to transmit power to the multi-functional pulley system. The multi-functional pulley system transmits power to the rope wheel through an internal mechanism. The rope wheel winds the rope, and finally the multi-functional pulley system automatically lifts the operator from the ground to the working height.

[0003] Existing pulley systems are prone to transmission failure during use, causing the rope pulley to move in the opposite direction, indicating that the rope is lowered rapidly, which can cause workers working at heights to fall quickly, posing a great safety hazard. Therefore, it is necessary to install fall protection structures in pulley systems. Utility Model Content

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a fall-prevention structure for pulley systems.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a fall prevention structure for pulley blocks, including a driving gear, a driven gear and a driven gear shaft and a first fall prevention mechanism;

[0006] Both the driving gear and the driven gear are mounted on the housing, and the driving gear and the driven gear mesh. The driven gear shaft passes through the driven gear, and a pulley is provided at one end of the driven gear shaft, with a rope wound on the pulley.

[0007] The first fall protection mechanism includes a compression spring and a one-way tooth; one end of the one-way tooth is a rotating end and the other end is a free end. The rotating end is mounted on the outer shell via a rotating shaft. A compression spring is provided between the free end of the one-way tooth and the inner wall of the outer shell. The teeth on the one-way tooth are located at the free end, and the teeth face the driven gear and mesh with the driven gear.

[0008] When the driven gear rotates counterclockwise, the free end of the one-way tooth is driven counterclockwise by the driven gear to lift the compression spring, causing the free end of the one-way tooth to rotate along the rotating end, and the driven gear can rotate normally counterclockwise.

[0009] When the driven gear rotates clockwise, the teeth of the one-way gear mesh with the driven gear, and the driven gear cannot rotate clockwise.

[0010] In a preferred embodiment of the present invention, there are two first anti-fall mechanisms, and the two first anti-fall mechanisms are respectively disposed on both sides of the drive gear.

[0011] In a preferred embodiment of this invention, the one-way tooth is a ratchet.

[0012] In a preferred embodiment of the present invention, a second anti-fall mechanism is further included. The second anti-fall mechanism includes a fall-stop shaft and a fall-stop cover. The other end of the driven gear shaft is provided with a mounting hole. The fall-stop shaft is provided in the mounting hole. The fall-stop shaft extends out of the mounting hole and protrudes from the driven gear shaft.

[0013] A driven gear shaft with a fall arresting shaft passes through the outer shell and is installed inside the fall arresting cover. The fall arresting cover has an eccentric groove, and the eccentric groove has a fall arresting groove protruding towards the outer contour of the fall arresting cover. The two points connecting the eccentric groove and the fall arresting groove are the start point and the end point of the stroke, respectively. When the fall arresting shaft rotates counterclockwise, the fall arresting shaft passes through the start point and the end point of the stroke in sequence. The distance from the start point of the fall arresting groove to the outer contour of the fall arresting cover is greater than the distance from the end point of the fall arresting groove to the outer contour of the fall arresting cover.

[0014] In a preferred embodiment of the present invention, the eccentric groove includes a first eccentric groove and a second eccentric groove connected to each other. The first stroke start point of the first eccentric groove is connected to the second stroke end point of the second eccentric groove through a first anti-fall groove, and the first stroke end point of the first eccentric groove is connected to the second stroke start point of the second eccentric groove through a second anti-fall groove.

[0015] Furthermore, the second stroke end point of the second eccentric groove is located closer to the outer contour of the fall arrestor cover than the first stroke start point of the first eccentric groove, and the first stroke end point of the first eccentric groove is located closer to the outer contour of the fall arrestor cover than the second stroke start point of the second eccentric groove.

[0016] The anti-fall shaft moves counterclockwise along the trajectory of the driven gear shaft, which is: first stroke start point, second stroke end point, second eccentric groove, second stroke start point, first stroke end point, first eccentric groove, first stroke start point, and so on.

[0017] The trajectory of the fall arrest shaft following the clockwise movement of the driven gear shaft is either the first stroke start point, the first eccentric groove, the first stroke end point, and the second fall arrest groove, or the second stroke start point, the second eccentric groove, the second stroke end point, and the first fall arrest groove.

[0018] The beneficial effects of this utility model are as follows: By setting up two first anti-fall mechanisms, when the driving gear is damaged, it effectively prevents the driven gear shaft from driving the rope wheel to rotate in the opposite direction, preventing the rope on the rope from loosening rapidly, and preventing the pulley group from sliding down rapidly, which could pose a safety hazard to workers at height. When the driving gear and the two first anti-fall mechanisms are damaged, the second anti-fall mechanism prevents the driven gear shaft from driving the rope wheel to rotate in the opposite direction, preventing the pulley group from sliding down rapidly and posing a safety hazard to workers at height. The first and second anti-fall mechanisms realize the anti-fall function of the pulley group, greatly increasing the safety protection performance of the pulley group. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the structure of this utility model. Figure 3 ;

[0022] Figure 4 This is a schematic diagram of the first fall protection mechanism of this utility model;

[0023] Figure 5 yes Figure 3 The right view;

[0024] Figure 6 This is a schematic diagram of the position and structure of the anti-fall cover and eccentric groove of this utility model;

[0025] Figure 7 This is a schematic diagram of the anti-fall shaft structure of this utility model;

[0026] Figure 8 This is a schematic diagram of the eccentric groove structure of this utility model;

[0027] Figure 9 This is a schematic diagram of the anti-fall cover structure of this utility model. Figure 1 ;

[0028] Figure 10 This is a schematic diagram of the anti-fall cover structure of this utility model. Figure 2 ;

[0029] Figure 11 This is a schematic diagram of the driven gear shaft structure of this utility model;

[0030] In the diagram: 1. Driven gear; 2. Driven gear shaft; 3. Housing; 4. Compression spring; 5. One-way gear; 6. Rotating end 601; Free end 602; Shaft; 7. Fall stop shaft; 8. Fall stop cover; 9. Eccentric groove; 10. First eccentric groove 1001; Second eccentric groove 1002; First stroke start point A; First stroke end point B; Second stroke start point C; Second stroke end point D; Fall stop groove 11; First fall stop groove 1101; Second fall stop groove 1102; Sheave 12; Rope 13. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] like Figures 1 to 11 The diagram shows an anti-fall structure for a pulley system, comprising a driving gear 1, a driven gear 2, a driven gear shaft 3, and a first anti-fall mechanism;

[0034] Both the driving gear 1 and the driven gear 2 are mounted on the housing 4, and the driving gear 1 and the driven gear 2 mesh with each other. The driven gear shaft 3 passes through the driven gear 2. One end of the driven gear shaft 3 is provided with a pulley 12, and a rope 13 is wound on the pulley 12. The other end of the driven gear shaft 3 passes through the housing.

[0035] The first anti-fall mechanism includes a compression spring 5 and a one-way tooth 6; one end of the one-way tooth 6 is a rotating end 601 and the other end is a free end 602. The rotating end 601 is mounted on the outer shell 4 via a rotating shaft 7. A compression spring 5 is provided between the free end 602 of the one-way tooth 6 and the inner wall of the outer shell 4. The teeth on the one-way tooth 6 are located at the free end 602, and the teeth face the driven gear 2 and mesh with the driven gear 2.

[0036] When the driven gear 2 rotates counterclockwise, the free end 602 of the one-way gear 6 is driven counterclockwise by the driven gear to push the spring 5 upward, so that the free end 602 of the one-way gear 6 rotates along the rotating end 601, and the driven gear 2 can rotate normally counterclockwise.

[0037] When the driven gear 2 rotates clockwise, the teeth of the one-way gear 6 mesh with the driven gear 2, and the driven gear 2 cannot rotate clockwise.

[0038] In use, the fall arrestor structure of this application first drives the drive gear 1 to rotate clockwise through the power input structure. Since the drive gear 1 and the driven gear 2 mesh, the drive gear 1 drives the driven gear 2 to rotate counterclockwise. Since the driven gear shaft 3 passes through the driven gear 2, a rope wheel 12 is provided on one end of the driven gear shaft 3, and a rope 13 is wound on the rope wheel 12; thus, the driven gear shaft 3 drives the rope wheel 12 to rotate counterclockwise, realizing that the rope wheel 12 transmits the rope counterclockwise, realizing that the pulley block rises to the height of high-altitude operation, which is convenient for high-altitude operation. In this application, the rotating end 601 of the one-way gear 6 is set on the outer shell 4 through the rotating shaft 7. A compression spring 5 is provided between the free end 602 of the one-way gear 6 and the inner wall of the outer shell 4. The teeth on the one-way gear 6 are set on the self- From end 602, the teeth face towards and mesh with the driven gear 2. When the driving gear 1 rotates clockwise, driving the driven gear 2 to rotate counterclockwise, the driven gear 2 meshes with the one-way tooth 6. When the driven gear rotates counterclockwise, the free end 602 of the one-way tooth 6 pushes the compression spring 5 upward, causing the free end 602 of the driven gear 2 to rotate along the rotating end 601. The driven gear 2 can rotate normally in reverse, that is, the compression spring 5 achieves soft limiting of the one-way tooth 6. When an accident occurs, such as the driving gear 1 is damaged, when the driven gear 2 rotates clockwise, the teeth of the one-way tooth 6 mesh with the driven gear 2. In this application, the one-way tooth 6 is a ratchet, and the driven gear 2 cannot rotate clockwise, preventing the driven gear 2 from moving in the opposite direction, i.e., clockwise, thus realizing the anti-fall function of the pulley block.

[0039] In a preferred embodiment, the first anti-fall mechanism in this application comprises two parts, with each part positioned on one side of the driving gear 1. This arrangement of two first anti-fall structures provides dual protection for the driven gear 2, ensuring the stability and safety of the pulley block's anti-fall structure.

[0040] As a preferred embodiment, a second fall protection mechanism is also included, which includes a fall protection shaft 8 and a fall protection cover 9. The driven gear shaft 3 has a mounting hole at one end that passes through the housing. The fall protection shaft 8 is provided in the mounting hole and extends out of the mounting hole and protrudes from the driven gear shaft 3.

[0041] A driven gear shaft 3 with a fall arrest shaft 8 passes through the outer casing 4 and is installed inside the fall arrest cover 9. The fall arrest cover 9 has an eccentric groove 10, and the eccentric groove 10 has a fall arrest groove 11 protruding towards the outer contour of the fall arrest cover 9. The two points connecting the eccentric groove 10 and the fall arrest groove 11 are the stroke start point a and the stroke end point b, respectively. When the fall arrest shaft 8 rotates counterclockwise, the fall arrest shaft 8 passes through the stroke start point a and the stroke end point b in sequence. The distance from the stroke start point a of the fall arrest groove 11 to the outer contour of the fall arrest cover 9 is greater than the distance from the stroke end point b of the fall arrest groove 11 to the outer contour of the fall arrest cover 9.

[0042] Driven gear shaft 3 drives the fall arrest shaft 8 in its mounting hole to rotate counterclockwise. At this time, the fall arrest shaft 8 moves back and forth along this trajectory from the start point of the stroke, the end point of the stroke, the eccentric groove, and the start point of the stroke, so that the driven gear shaft 3 drives the fall arrest shaft 8 to rotate counterclockwise stably in the eccentric groove 10. Since the driven gear shaft 3 drives the rope wheel 12 to rotate counterclockwise and wind the rope 13, the high-altitude workers can be raised to the designated height to carry out high-altitude work.

[0043] If the driving gear 1 or the first fall arrest structure is damaged, when the driven gear 2 rotates clockwise, the driven gear shaft 3 drives the fall arrest shaft 8 in its mounting hole to rotate along the eccentric groove 10 to the fall arrest groove 11. Since the distance from the starting point of the fall arrest groove 11 to the outer contour of the fall arrest cover 9 is greater than the distance from the ending point of the fall arrest groove 11 to the outer contour of the fall arrest cover 9, the fall arrest shaft 8 gradually slides into the fall arrest groove 11 under the action of centrifugal force. The fall arrest groove 11 limits the fall arrest shaft 8, and the driven gear shaft 3 cannot continue to rotate clockwise. This prevents the driven gear shaft 3 from driving the rope wheel 12 to rotate clockwise, and prevents the rope on the rope wheel from loosening in the opposite direction. This effectively prevents the rapid descent of the pulley block caused by the rapid loosening of the rope, which could pose a safety hazard to workers working at height.

[0044] In a more preferred embodiment, the eccentric groove 10 includes a first eccentric groove 1001 and a second eccentric groove 1002 connected to each other. The first travel start point A of the first eccentric groove 1001 is connected to the second travel end point D of the second eccentric groove 1002 through a first stop groove 1101, and the first travel end point B of the first eccentric groove 1002 is connected to the second travel start point C of the second eccentric groove 1002 through the second stop groove 1102.

[0045] Furthermore, the second stroke end point D of the second eccentric groove 1002 is positioned close to the outer contour of the fall arrest cover 9 relative to the first stroke start point A of the first eccentric groove 1001, and the first stroke end point B of the first eccentric groove 1002 is positioned close to the outer contour of the fall arrest cover 9 relative to the second stroke start point C of the second eccentric groove 1001.

[0046] The anti-fall shaft 8 follows the driven gear shaft 3 in a counterclockwise motion along the trajectory of the first stroke start point A, the second stroke end point D, the second eccentric groove 1002, the second stroke start point C, the first stroke end point B, the first eccentric groove 1001, and the first stroke start point A, and moves back and forth along this trajectory.

[0047] The clockwise movement trajectory of the fall arresting shaft 8 following the driven gear shaft 3 is either the first stroke start point A, the first eccentric groove 1001, the first stroke end point B, and the second fall arresting groove 1102, or the second stroke start point C, the second eccentric groove 1102, the second stroke end point D, and the first fall arresting groove 1101.

[0048] During the use of the pulley block, when the driving gear 1 rotates clockwise, driving the driven gear 2 to rotate counterclockwise, the driven gear shaft 3 drives the fall arrest shaft 8 in its mounting hole to rotate counterclockwise. At this time, the fall arrest shaft 8 moves back and forth along the trajectory from the first stroke start point A, the second stroke end point D, the second eccentric groove 1002, the second stroke start point C, the first stroke end point B, the first eccentric groove 1001, and the first stroke start point A. This causes the driven gear shaft 3 to drive the fall arrest shaft 8 to rotate counterclockwise stably in the second eccentric groove 1002 and the first eccentric groove 1001. Since the driven gear shaft 3 drives the rope wheel 12 to rotate counterclockwise and wind the rope 13, the high-altitude workers can be raised to the designated height to carry out high-altitude operations.

[0049] If the driving gear 1 or the first fall arrestor structure is damaged, the rope can be stopped by the second fall arrestor mechanism. Specifically, when the driven gear 2 rotates clockwise, the driven gear shaft 3 drives the fall arrestor shaft 8 in its mounting hole to move half a circle along the first stroke start point A, the first eccentric groove 1001, and the first stroke end point B. Since the first stroke end point B of the first eccentric groove 1001 is close to the outer contour of the fall arrestor cover 9 relative to the second stroke start point C of the second eccentric groove 1002, the fall arrestor shaft 8 gradually slides into the second fall arrestor groove 1102 under the action of centrifugal force. The second fall arrestor groove 1102 limits the fall arrestor shaft 8, and the driven gear shaft 3 cannot continue to rotate clockwise. This prevents the driven gear shaft 3 from driving the rope pulley 12 to rotate clockwise, and prevents the rope on the rope pulley from loosening in the opposite direction. This effectively prevents the rapid descent of the pulley block caused by the rapid loosening of the rope, which could pose a safety hazard to workers at height. In the event of a fall, the pulley system can quickly prevent a fall. Similarly, when the driven gear shaft 3 rotates clockwise, it also drives the fall-stop shaft 8 in the mounting hole to move half a turn along the second stroke start point C, the second eccentric groove 1102, and the second stroke end point D. Since the second stroke end point D of the second eccentric groove 1002 is close to the outer contour of the fall-stop cover 9 relative to the first stroke start point A of the first eccentric groove 1001, the fall-stop shaft 8 gradually slides into the first fall-stop groove 1101 under the action of centrifugal force. The first fall-stop groove 1101 limits the fall-stop shaft 8, and the driven gear shaft 3 cannot continue to rotate. This effectively prevents the driven gear shaft 3 from rotating clockwise, thereby preventing the rope from loosening quickly due to the clockwise rotation of the rope wheel. It also prevents the pulley system from falling rapidly due to damage to the driving gear 1 or the first fall-stop structure, thus achieving the fall-stop function of the pulley system and greatly increasing the safety protection performance of the pulley system.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A fall arrest arrangement for a pulley block, characterised in that, It includes a driving gear (1), a driven gear (2), a driven gear shaft (3), and a first anti-fall mechanism; The driving gear (1) and the driven gear (2) are both mounted on the outer casing (4), and the driving gear (1) and the driven gear (2) mesh with each other. The driven gear shaft (3) passes through the driven gear (2), and a rope wheel (12) is provided on one end of the driven gear shaft (3). A rope (13) is wound on the rope wheel (12). The first anti-fall mechanism includes a compression spring (5) and a one-way tooth (6); one end of the one-way tooth (6) is a rotating end (601) and the other end is a free end (602). The rotating end (601) is mounted on the outer shell (4) via a rotating shaft (7). A compression spring (5) is provided between the free end (602) of the one-way tooth (6) and the inner wall of the outer shell (4). The teeth on the one-way tooth (6) are located at the free end (602), and the teeth of the one-way tooth (6) face the driven gear (2) and mesh with the driven gear (2). When the driven gear (2) rotates counterclockwise, the free end (602) of the one-way tooth (6) is driven counterclockwise by the driven gear to push the spring (5) upward, so that the free end (602) of the one-way tooth (6) rotates along the rotating end (601), and the driven gear (2) can rotate normally counterclockwise; When the driven gear (2) rotates clockwise, the teeth of the one-way gear (6) mesh with the driven gear (2), and the driven gear (2) cannot rotate clockwise.

2. The anti-fall structure for pulley systems according to claim 1, characterized in that, There are two first fall protection mechanisms, and the two first fall protection mechanisms are respectively set on both sides of the drive gear (1).

3. The anti-fall structure for pulley systems according to claim 1, characterized in that, The one-way tooth (6) is a ratchet.

4. The anti-fall structure for pulley systems according to claim 1, characterized in that, It also includes a second anti-fall mechanism, which includes a fall-stop shaft (8) and a fall-stop cover (9). The other end of the driven gear shaft (3) is provided with a mounting hole, and the fall-stop shaft (8) is provided in the mounting hole. The fall-stop shaft (8) extends out of the mounting hole and protrudes from the driven gear shaft (3). One end of the driven gear shaft (3) with a fall arrest shaft (8) passes through the outer shell (4) and is set inside the fall arrest cover (9). The fall arrest cover (9) is provided with an eccentric groove (10). The eccentric groove (10) is provided with a fall arrest groove (11) protruding out of the outer contour of the fall arrest cover (9). The two points connected by the eccentric groove (10) and the fall arrest groove (11) are the start point and the end point of the stroke, respectively. When the fall arrest shaft (8) rotates counterclockwise, the fall arrest shaft (8) passes through the start point and the end point of the stroke in sequence. The distance from the start point of the stroke of the fall arrest groove (11) to the outer contour of the fall arrest cover (9) is greater than the distance from the end point of the stroke of the fall arrest groove (11) to the outer contour of the fall arrest cover (9).

5. The anti-fall structure for pulley blocks according to claim 4, characterized in that, The eccentric groove (10) includes a first eccentric groove (1001) and a second eccentric groove (1002) connected to each other. The first stroke start point (A) of the first eccentric groove (1001) is connected to the second stroke end point (D) of the second eccentric groove (1002) through the first stop groove (1101). The first stroke end point (B) of the first eccentric groove (1002) is connected to the second stroke start point (C) of the second eccentric groove (1002) through the second stop groove (1102). Furthermore, the second stroke end point (D) of the second eccentric groove (1002) is located near the outer contour of the stop cover (9) relative to the first stroke start point (A) of the first eccentric groove (1001), and the first stroke end point (B) of the first eccentric groove (1002) is located near the outer contour of the stop cover (9) relative to the second stroke start point (C) of the second eccentric groove (1001). The anti-fall shaft (8) moves counterclockwise along the driven gear shaft (3) in the following trajectory: first stroke start point (A), second stroke end point (D), second eccentric groove (1002), second stroke start point (C), first stroke end point (B), first eccentric groove (1001), first stroke start point (A), and repeats along this trajectory. The trajectory of the fall arresting shaft (8) moving clockwise with the driven gear shaft (3) is either the first stroke start point (A), the first eccentric groove (1001), the first stroke end point (B), and the second fall arresting groove (1102), or the second stroke start point (C), the second eccentric groove (1102), the second stroke end point (D), and the first fall arresting groove (1101).

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