Anti-extrusion device for aerial work platform

Abstract

The utility model discloses an aerial work platform anti-extrusion device which comprises a first support and a second support which are installed on the two sides of an aerial work platform, an anti-extrusion assembly is arranged between the first support and the second support, the anti-extrusion assembly comprises a track, an anti-extrusion part and a travel switch, and the track is arranged on the first support. A through hole is formed in the side wall, perpendicular to the bottom wall of the track, of the track, the through hole is formed along the side close to an operator, one end of the travel switch is fixedly connected with the first support, the other end of the travel switch penetrates through the through hole and protrudes out of the side wall of the track, and the second support is provided with the track, the through hole and the travel switch which are the same as the first support and are symmetrically arranged. The two ends of the anti-extrusion part are slidably installed on the rails of the first support and the second support respectively. The travel switch is arranged on the side wall of the track, and the trigger travel of the travel switch is shortened, so that an operator can quickly and timely trigger the travel switch through the anti-extrusion part.

Description

Technical Field

[0001] This utility model relates to an anti-pinch device for aerial work platforms, belonging to the technical field of boom-type aerial work platforms. Background Technology

[0002] The anti-pinch device is a measure to protect operators. When operating a boom-type aerial work platform, if a sudden, uncontrollable factor causes violent shaking, resulting in the operator losing balance, it may lead to misoperation and a serious safety accident. Therefore, when the operator loses balance, the tilting force of their body triggers the anti-pinch device, automatically activating the safety protection mechanism and stopping the operation of the equipment. Ultimately, this protects the operator.

[0003] Currently, most anti-pinch devices on aerial work platforms are modular structures, located on both sides of the platform control box and bolted to the horizontal guardrails. On the one hand, existing anti-pinch devices have a relatively complex overall structure, resulting in longer assembly, debugging, and after-sales maintenance times. On the other hand, they occupy a large amount of space. Aerial work platforms have limited working areas, and workers should have ample operating space. Existing anti-pinch devices are bulky, and operators are easily exposed to them during operations, potentially leading to serious consequences.

[0004] Patent CN219971773U discloses a safety device for an aerial work platform. It uses an anti-collision mechanism, where when the work platform shakes, the operator pushes a support rod to make a slider slide within the track, triggering a sensor switch at the bottom of the track. Although this can prevent accidental activation by the operator, the sensor switch is located at the bottom of the track, and the travel distance to trigger the sensor switch is too long, making it impossible to trigger the sensor switch in time to stop the alarm and the entire machine. This still poses a safety risk to the operator's personal safety. Summary of the Invention

[0005] Purpose of the invention: To solve the above-mentioned technical problems, this utility model provides an anti-pinch device for aerial work platforms. This device shortens the travel distance of the limit switch by setting the limit switch on the side wall of the track, thereby improving the triggering timeliness.

[0006] Technical Solution: A device for preventing crushing on an aerial work platform includes a first support and a second support installed on both sides of the work platform. An anti-crushing component is provided between the first and second supports. The anti-crushing component includes a track, an anti-crushing part, and a limit switch. The track is set on the first support, and a through hole is opened on the side wall of the track perpendicular to the bottom wall of the track. The through hole is set along the side closer to the operator. One end of the limit switch is fixedly connected to the first support, and the other end passes through the through hole and protrudes from the side wall of the track. The second support is provided with the same and symmetrically arranged track, through hole, and limit switch as the first support. The two ends of the anti-crushing part are slidably installed on the track of the first and second supports, respectively. After the anti-crushing part slides along the track, it presses down on the limit switch, causing the other end of the limit switch to compress and activate outward from the track.

[0007] This invention shortens the travel distance of the limit switch by placing it on the side wall of the track. This allows the operator to quickly and promptly trigger the limit switch through the anti-pinch part when the operating platform shakes, thereby stopping the operation of the entire machine and avoiding dangerous situations caused by excessive travel distance.

[0008] In a preferred embodiment, to prevent crushing, the anti-crushing part includes a slider, a support rod, and an elastic reset member. The slider is slidably mounted in the track of the first bracket. One end of the elastic reset member is connected to the bottom wall of the track of the first bracket, and the other end abuts against the side end face of the slider. The second bracket is provided with sliders and elastic reset members that are identical and symmetrically arranged with the first bracket. One end of the support rod is connected to the slider of the first bracket, and the other end is connected to the slider of the second bracket. The distance from the limit switch to the end of the track side wall near the operator is greater than the length of the slider along the sliding direction.

[0009] When the operator pushes the support rod, the slider slides along the track and presses the limit switch downward, thus triggering the limit switch to stop the machine from working. When the operator leaves the support rod, the support rod automatically resets due to the elastic reset component, and the limit switch resets at the same time. When the limit switch is not triggered normally, the elastic reset component supports the slider. At the same time, due to the preload of the elastic reset component, it can also prevent accidental activation.

[0010] In a preferred embodiment, to prevent the elastic reset member from radially bending during compression, a guide post is further included. One end of the guide post is fixedly connected to the bottom wall of the track, and the other end passes through the slider along the sliding direction of the slider. The elastic reset member is sleeved on the outer circumference of the guide post. By providing the guide post, the elastic reset member can extend and retract along the guide post, preventing it from radially bending. At the same time, the guide post provides a guiding effect for the slider, further improving the reliability and stability of the device.

[0011] Preferably, to facilitate triggering the limit switch, the slider has a chamfered portion on its side end face along the sliding direction that contacts the limit switch. The vertical height from the junction of the chamfered portion and the side end face of the slider along the sliding direction to the side wall of the track is greater than the height of the limit switch protruding from the side wall of the track. By providing a chamfered portion on the side end face of the slider, the inclined surface of the chamfered portion contacts the limit switch when the slider slides. As the slider slides, it gradually compresses the limit switch, causing it to contract and triggering the limit switch, thus reducing the impact force on the limit switch during triggering.

[0012] Preferably, to ensure that the chamfered portion does not affect the trigger stroke of the limit switch, a boss is provided on the side end face of the slider along the sliding direction. The chamfered portion is located on the side end face of the boss, and the vertical height from the junction of the chamfered portion and the side end face of the boss to the side wall of the track is greater than the height of the limit switch protruding from the side wall of the track. After providing the chamfered portion, the trigger stroke of the limit switch becomes longer; after providing the boss, the trigger stroke of the limit switch can be reduced, ensuring timely triggering.

[0013] In a preferred embodiment, to make the track more compatible with the angle when a person is tilted and to prevent jamming during triggering, the track is tilted, with the end of the track closer to the operator being higher than the end farther from the operator.

[0014] Preferably, to facilitate the installation of the anti-pinch part, the end of the track near the operator is provided with an anti-pinch part mounting port. During installation, the elastic reset member enters the track through the anti-pinch part mounting port and is fitted onto the guide post. Then, the slider enters the track through the anti-pinch part mounting port and is fitted onto the guide post.

[0015] In a preferred embodiment, to prevent the slider from completely passing the limit switch when the elastic reset member reaches its compression limit length, causing the limit switch to bulge out again before the slider is reset, thus preventing the slider from being reset, after the elastic reset member is compressed, the distance from the side end face of the slider closest to the operator to the bottom wall of the track is greater than the distance from the limit switch to the bottom wall of the track.

[0016] Beneficial effects: This utility model places the limit switch on the side wall of the track, shortening the trigger stroke of the limit switch. This allows the operator to quickly and promptly trigger the limit switch through the anti-pinch part after the operating platform shakes, thereby stopping the operation of the entire machine and avoiding dangerous situations caused by excessive trigger stroke. At the same time, the guide post passes through both the elastic reset member and the slider, not only serving a guiding function but also preventing radial bending of the elastic reset member. The chamfered part and boss reduce the impact force on the limit switch during triggering and shorten the trigger stroke, improving safety and reliability. Attached Figure Description

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

[0018] Figure 1 This is an overall assembly structure diagram of the present invention;

[0019] Figure 2 This is a structural diagram of the anti-pinch device of this utility model;

[0020] Figure 3 This is a cross-sectional view of the anti-crushing device of this utility model. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] like Figures 1-3As shown, an anti-pinch device for an aerial work platform includes a first support 1 and a second support 2 installed on both sides of the work platform. An anti-pinch component 3 is provided between the first support 1 and the second support 2. The anti-pinch component 3 includes a track 31, an anti-pinch part 32, and a limit switch 33. The track 31 is set on the first support 1, and a through hole 313 is opened on the track side wall 312 perpendicular to the bottom wall 311 of the track. The through hole 313 is set along the side closer to the operator. One end of the limit switch 33 is fixedly connected to the first support 1, and the other end passes through the through hole 313 and protrudes from the track side wall 312. The second support 2 is provided with the same and symmetrically arranged track 31, through hole 313, and limit switch 33 as the first support 1. The two ends of the anti-pinch part 32 are slidably installed on the track 31 of the first support 1 and the second support 2, respectively. After the anti-pinch part 32 slides along the track 31, it presses down on the limit switch 33, causing the other end of the limit switch 33 to be compressed and activated outward from the track 31.

[0025] By setting the limit switch 33 on the side wall 312 of the track, the trigger stroke of the limit switch 33 is shortened, so that when the operating platform shakes, the operator can quickly and timely trigger the limit switch 33 through the anti-pinch part 32, thereby stopping the operation of the whole machine and avoiding dangerous situations caused by excessive trigger stroke.

[0026] To prevent crushing, the anti-crushing part 32 includes a slider 321, a support rod 322, and an elastic reset member 323. The slider 321 is slidably installed in the track 31 of the first bracket 1. One end of the elastic reset member 323 is connected to the bottom wall 311 of the track of the first bracket 1, and the other end abuts against the side end face of the slider 321. The second bracket 2 is provided with the same slider 321 and elastic reset member 323 as the first bracket 1 and symmetrically arranged. One end of the support rod 322 is connected to the slider 321 of the first bracket 1, and the other end is connected to the slider 321 of the second bracket 2. The distance from the limit switch 33 to the end of the track side wall 312 near the operator is greater than the length of the slider 321 along the sliding direction. When the operator pushes the support rod 322, the slider 321 slides along the track 31, pressing the limit switch 33 downwards and triggering it to stop the machine from operating. When the operator removes the support rod 322, the support rod 322 automatically resets due to the elastic reset element 323, and the limit switch 33 resets simultaneously. When the limit switch 33 is not normally triggered, the elastic reset element 323 supports the slider 321, and the preload of the elastic reset element 323 also prevents accidental activation. A groove can be made on the side surface of the slider 321, with one end of the elastic reset element 323 abutting within the groove, improving the guiding properties of the elastic reset element 323.

[0027] To prevent the elastic reset member 323 from radially bending during compression, a guide post 4 is also included. One end of the guide post 4 is fixedly connected to the bottom wall 311 of the track, and the other end passes through the slider 321 along the sliding direction of the slider 321. The elastic reset member 323 is sleeved on the outer circumference of the guide post 4. By setting the guide post 4, the elastic reset member 323 can extend and retract along the guide post 4, preventing it from radially bending. At the same time, the guide post 4 can provide a guiding effect for the slider 321, further improving the reliability and stability of this device.

[0028] To facilitate triggering the limit switch 33, the slider 321 has a chamfered portion 5 on its side end face along the sliding direction, which contacts the limit switch 33. The vertical height from the junction of the chamfered portion 5 and the side end face of the slider 321 along the sliding direction to the track side wall 312 is greater than the height of the limit switch 33 protruding from the track side wall 312. The chamfered portion 5 on the side end face of the slider 321 ensures that when the slider 321 slides, the inclined surface of the chamfered portion 5 contacts the limit switch 33. As the slider 321 slides, it gradually compresses the limit switch 33, causing it to contract and trigger the limit switch 33, thus reducing the impact force on the limit switch 33 during triggering.

[0029] To ensure that the chamfered portion 5 does not affect the trigger stroke of the limit switch 33, a boss 6 is provided on the side end face of the slider 321 along the sliding direction. The chamfered portion 5 is located on the side end face of the boss 6. The vertical height from the junction of the chamfered portion 5 and the side end face of the boss 6 to the side wall 312 of the track is greater than the height of the limit switch 33 protruding from the side wall 312 of the track. The chamfered portion 5 increases the trigger stroke of the limit switch 33, while the boss 6 reduces the trigger stroke of the limit switch 33, ensuring timely triggering.

[0030] In order to make the track 31 more in line with the angle when the human body is tilted, and to prevent jamming when triggered, the track 31 is tilted, with the end of the track 31 closer to the operator being higher than the end further away from the operator.

[0031] To facilitate the installation of the anti-pinch part 32, the end of the track 31 near the operator is provided with an anti-pinch part mounting port 7. During installation, the elastic reset member 323 enters the track 31 through the anti-pinch part mounting port 7 and is fitted onto the guide post 4. Then, the slider 321 enters the track 31 through the anti-pinch part mounting port 7 and is fitted onto the guide post 4. In this embodiment, one end of the elastic reset member 323 can be welded to the bottom wall 311 of the track, or it can abut against the bottom wall 311 of the track. Abutting reduces the welding process and improves installation efficiency. An installation gap is left between the slider 321 and the track 31 to facilitate the installation of the slider 321.

[0032] To prevent the slider 321 from completely passing the limit switch 33 when the elastic reset member 323 reaches its compression limit length, causing the limit switch 33 to bulge out again before the slider 321 is reset, thus preventing the slider 321 from being reset, after the elastic reset member 323 is compressed, the distance from the side end face of the slider 321 closest to the operator to the bottom wall 311 of the track is greater than the distance from the limit switch 33 to the bottom wall 311 of the track.

[0033] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for preventing crushing of a high-altitude work platform, comprising a first support (1) and a second support (2) installed on both sides of the work platform, wherein an anti-crushing component (3) is provided between the first support (1) and the second support (2), the anti-crushing component (3) comprising a track (31), an anti-crushing part (32), and a limit switch (33), characterized in that: The track (31) is set on the first bracket (1). A through hole (313) is opened on the side wall (312) of the track perpendicular to the bottom wall (311) of the track. The through hole (313) is set along the side close to the operator. One end of the limit switch (33) is fixedly connected to the first bracket (1), and the other end passes through the through hole (313) and protrudes from the side wall (312) of the track. The second bracket (2) is provided with the same and symmetrically arranged track (31), through hole (313) and limit switch (33) as the first bracket (1). The two ends of the anti-squeezing part (32) are slidably installed on the track (31) of the first bracket (1) and the second bracket (2). After the anti-squeezing part (32) slides along the track (31), it presses the limit switch (33) so that the other end of the limit switch (33) is compressed and activated to the outside of the track (31).

2. The anti-pinch device for aerial work platforms according to claim 1, characterized in that: The anti-squeezing part (32) includes a slider (321), a support rod (322), and an elastic reset member (323). The slider (321) is slidably installed in the track (31) of the first bracket (1). One end of the elastic reset member (323) is connected to the bottom wall (311) of the track of the first bracket (1), and the other end abuts against the side end face of the slider (321). The second bracket (2) is provided with the same and symmetrically arranged slider (321) and elastic reset member (323) as the first bracket (1). One end of the support rod (322) is connected to the slider (321) of the first bracket (1), and the other end is connected to the slider (321) of the second bracket (2). The distance from the limit switch (33) to the end of the track side wall (312) near the operator is greater than the length of the slider (321) along the sliding direction.

3. The anti-pinch device for aerial work platforms according to claim 2, characterized in that: It also includes a guide post (4), one end of which is fixedly connected to the bottom wall (311) of the track, and the other end passes through the slider (321) along the sliding direction of the slider (321). The elastic reset member (323) is sleeved on the outer circular surface of the guide post (4).

4. The anti-pinch device for aerial work platforms according to claim 2, characterized in that: The slider (321) has a chamfered part (5) on its side end face along the sliding direction that contacts the limit switch (33). The vertical height from the junction of the chamfered part (5) and the side end face of the slider (321) along the sliding direction to the track side wall (312) is greater than the height of the limit switch (33) protruding from the track side wall (312).

5. The anti-pinch device for aerial work platforms according to claim 4, characterized in that: The slider (321) has a boss (6) on its side end face along the sliding direction. The chamfer (5) is provided on the side end face of the boss (6). The vertical height from the junction of the chamfer (5) and the side end face of the boss (6) to the side wall of the track (312) is greater than the height of the limit switch (33) protruding from the side wall of the track (312).

6. The anti-pinch device for aerial work platforms according to claim 1, characterized in that: The track (31) is inclined, with the end of the track (31) closer to the operator being higher than the end farther from the operator.

7. The anti-pinch device for aerial work platforms according to claim 3, characterized in that: The end of the track (31) near the operator is provided with an anti-squeezing part installation port (7).

8. The anti-pinch device for aerial work platforms according to claim 2, characterized in that: After the elastic reset member (323) is compressed, the distance from the side end face of the slider (321) near the operator to the bottom wall of the track (311) is greater than the distance from the limit switch (33) to the bottom wall of the track (311).

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