Anti-extrusion device of working platform

Abstract

The utility model discloses an anti-extrusion device of a working platform, which comprises mounting racks symmetrically mounted on a platform upright post, a first track and a second track which are respectively mounted on the mounting racks, a moving component slidably mounted on the first track and the second track, and an inductive switch mounted at the bottom of the second track, the two ends of the moving rod are slidably connected with the first track and the second track respectively, the first track and the second track are obliquely arranged in the human body tilting direction, and the linear distance from the ends, close to the platform, of the first track and the second track to the platform stand columns close to the platform in the human body tilting direction is larger than the diameter of the end of the moving rod. And by reserving the falling space of the moving rod, an operator has enough moving space when being extruded, and the risk of secondary extrusion is avoided. The spring plunger is adopted to avoid repeated positioning during resetting after falling off, the two ends of the movable rod are of asymmetric structures to avoid clamping stagnation caused by over-constraint of the symmetric structures, and the responsivity and the success rate during triggering are improved.

Description

Technical Field

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

[0002] Current aerial work platforms commonly employ anti-pinch devices based on a dynamic sensing protection mechanism. When sudden abnormal shaking of the equipment causes the operator to lose balance, the device is triggered by tilting force to brake urgently and avoid accidents. Existing technical solutions typically use a prefabricated structure, symmetrically installing the device body on both sides of the work platform control box and rigidly connecting it to the horizontal guardrail with bolts. However, the complexity of this structure leads to low operation and maintenance efficiency. Existing devices use a multi-component assembly architecture. This design not only requires repeated adjustments to the coordination accuracy between modules but also makes overall disassembly and maintenance difficult, significantly increasing the commissioning cycle and maintenance costs.

[0003] Secondly, the existing three-dimensional assembly structure of the device significantly compresses the operating space of the work platform, creating a dual risk: in daily operations, operators are prone to accidentally triggering the device, causing unnecessary emergency braking; and in special working conditions such as crossing obstacles, the rigid protruding structure of the device further reduces the safe distance between the operator and the obstacle. More seriously, when the device triggers emergency braking, its fixed frame will trap the operator in the narrow gap formed between the device body and the obstacle, completely depriving them of the possibility of escaping independently by adjusting their body position, effectively creating a secondary risk of compression. Summary of the Invention

[0004] Purpose of the invention: To solve the above-mentioned technical problems, this utility model provides an anti-pinch device for a work platform. This device avoids the risk of secondary crushing by the operator by reserving space for the movable rod to fall off.

[0005] Technical solution: An anti-pinch device for a work platform includes a mounting frame symmetrically mounted on a platform column, a first track and a second track respectively mounted on the mounting frame, a movable component slidably mounted on the first track and the second track, and an inductive switch mounted at the bottom of the second track. The movable component includes a movable rod, with both ends of the movable rod slidably connected to the first track and the second track respectively. The first track and the second track are inclined along the direction of the human body's tilt. The straight-line distance from the end of the first track and the second track near the platform along the direction of the human body's tilt to the platform column near the platform side is greater than the diameter of the end of the movable rod.

[0006] This invention provides space for the movable rod to detach. When the operator is squeezed and pushes the movable rod to detach, the sensor switch is triggered, and the whole machine stops working, so that the operator has enough room to move when squeezed, avoiding the risk of secondary squeezing.

[0007] In a preferred embodiment, to limit the movement of the moving component in the absence of a trigger, a limiting hole is provided on the mounting bracket. The moving component also includes elastic limiting parts installed at both ends of the moving rod. The elastic limiting parts abut against the limiting holes. When the moving rod is subjected to a pushing force, the elastic limiting parts and the limiting holes are squeezed and contracted, causing the moving rod to move along the first track and the second track and then fall off.

[0008] When not triggered, the elastic limiting part abuts against the limiting hole. When triggered, the elastic limiting part and the limiting hole are squeezed and contracted, causing the moving rod to move along the track and fall off from the reserved space. The installation is simple and it is not easy to accidentally trigger.

[0009] In a preferred embodiment, to avoid frequent adjustments or repeated positioning after detachment, the elastic limiting part is a spring plunger, the mounting end of the spring plunger is connected to the internal thread of one end of the moving rod, and the telescopic end of the spring plunger abuts against the limiting hole.

[0010] The spring plunger design allows for accurate return to its original position even after multiple detachments, eliminating the need for repeated positioning. It simply requires contact with the limiting hole, and the spring's elasticity allows the plunger to automatically adjust its position, reducing alignment difficulties during installation. Furthermore, compared to rigid contact, the spring's cushioning effect reduces wear on the contact surfaces, extending service life. In addition, the spring plunger structure is relatively simple, easy to install, and maintenance only requires replacing the spring or plunger, rather than the entire structure, saving costs and time.

[0011] In a preferred embodiment, to improve the smoothness of the spring plunger's retraction and movement, a guide bevel is provided on the side of the limiting hole near the moving rod, and the spring plunger abuts against the guide bevel.

[0012] In a preferred embodiment, to avoid jamming caused by over-constraint of the symmetrical structure, a spherical sliding part is provided at one end of the moving rod located on one side of the first track, a guide part is provided on the first track, the spherical sliding part slides along the guide part on the first track, and the spring plunger is disposed inside the spherical sliding part.

[0013] The spherical sliding part has three rotational degrees of freedom, but due to the guide constraint on the track, it retains only a single degree of translation along the guide direction. The other moving rod end remains a cylindrical shape without change, possessing one translational degree of freedom and one rotational degree of freedom. The spherical sliding part is forcibly aligned with the movement direction by the guide part, eliminating lateral offset. The cylindrical end allows rotation around the axis to compensate for installation errors, forming a hybrid constraint system to avoid jamming caused by over-constraint. When the aerial work platform shakes and the operator pushes the moving rod to generate an oblique impact force, the spherical sliding part, constrained by the guide part, decomposes the oblique force into an axial movement component and a lateral component, which are used for triggering disengagement and absorbed by the guide part, respectively. The rotational degree of freedom of the cylindrical end allows the rod to be finely adjusted around the axis, avoiding combined bending and torsional stress on the rod due to rigid constraints at both ends. The cylindrical end retains a rotational degree of freedom to prevent misalignment and jamming of the spring plunger and the limiting hole due to track parallelism errors, improving the responsiveness and success rate of triggering.

[0014] In a preferred embodiment, in order to enable the moving rod to travel along a predetermined route, the end of the second track near the platform is provided with an inclined guide plate, which is inclined in a vertically downward direction.

[0015] In a preferred embodiment, to stop the spring plunger, a stop screw is also included, which passes through the end of the moving rod on the side where the inductive switch is located and abuts against the outer circumferential surface of the spring plunger inside it.

[0016] Beneficial effects: This utility model provides space for the movable rod to detach. When the operator is squeezed and pushes the movable rod to detach, the inductive switch is triggered, and the entire machine stops operating. This ensures that the operator has sufficient room to move when squeezed, avoiding the risk of secondary compression. The use of a spring plunger avoids frequent adjustments or repeated positioning during reset after detachment. The asymmetrical structure at both ends of the movable rod avoids jamming caused by over-constraint in a symmetrical structure, improving the responsiveness and success rate of triggering. 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 a structural diagram of the present invention;

[0019] Figure 2 This is a cross-sectional view of the structure at the second track of this utility model;

[0020] Figure 3 This is a cross-sectional view of the overall structure 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 Figure 1-3 As shown, an anti-pinch device for a work platform includes a mounting frame 2 symmetrically mounted on a platform column 1, a first track 3 and a second track 4 respectively mounted on the mounting frame 2, a sliding component 5 slidably mounted on the first track 3 and the second track 4, and an inductive switch 8 mounted at the bottom of the second track 4. The sliding component 5 includes a moving rod 51, with both ends of the moving rod 51 slidably connected to the first track 3 and the second track 4 respectively. The first track 3 and the second track 4 are inclined along the direction of the human body's tilt. The straight-line distance from the end of the first track 3 and the second track 4 near the platform along the direction of the human body's tilt to the platform column 1 near the platform is greater than the diameter of the end of the moving rod 51.

[0025] By reserving space for the movable rod 51 to detach, the sensor switch 8 is triggered after the operator is squeezed and pushes the movable rod 51 to detach, and the whole machine stops working, so that the operator has enough room to move when squeezed, avoiding the risk of secondary squeezing.

[0026] To limit the movement of the moving component 5 in the absence of triggering, it also includes limiting holes 6 respectively provided on the mounting bracket 2. The moving component 5 also includes elastic limiting parts 52 installed at both ends of the moving rod 51. The elastic limiting parts 52 abut against the limiting holes 6. When the moving rod 51 is pushed, the elastic limiting parts 52 and the limiting holes 6 are squeezed and contracted, causing the moving rod 51 to move along the first track 3 and the second track 4 and then fall off.

[0027] When not triggered, the elastic limiting part 52 abuts against the limiting hole 6. When triggered, the elastic limiting part 52 and the limiting hole 6 are squeezed and contracted, causing the moving rod 51 to move along the track and fall off from the reserved space. The installation is simple and it is not easy to accidentally trigger.

[0028] To avoid frequent adjustments or repeated positioning after detachment, the elastic limiting part 52 is a spring plunger. The mounting end of the spring plunger is connected to the internal thread of one end of the moving rod 51, and the telescopic end of the spring plunger abuts against the limiting hole 6.

[0029] The spring plunger design allows it to accurately return to its original position even after multiple detachments, eliminating the need for repeated positioning. It simply needs to abut against the limiting hole 6. Furthermore, the spring's elasticity allows the plunger to automatically adjust its position, reducing alignment difficulties during installation. Compared to rigid contact, the spring's cushioning effect reduces wear on the contact surface, extending service life. In addition, the spring plunger structure is relatively simple, easy to install, and maintenance only requires replacing the spring or plunger, rather than the entire structure, saving costs and time.

[0030] To improve the smoothness of the spring plunger's retraction and movement, a guide angle 61 is provided on the side of the limiting hole 6 near the moving rod 51, and the spring plunger abuts against the guide angle 61. In this embodiment, the guide angle 61 is 120°.

[0031] To avoid jamming caused by over-constraint of the symmetrical structure, a spherical sliding part 511 is provided at one end of the moving rod 51 located on one side of the first track 3. A guide part 31 is provided on the first track 3. The spherical sliding part 511 slides along the guide part 31 on the first track 3. The spring plunger is disposed inside the spherical sliding part 511.

[0032] The spherical sliding part 511 has three rotational degrees of freedom, but due to the guide constraint on the track, it retains only a single degree of translation along the guide direction. The other end of the moving rod 51 remains a cylindrical shape without change, possessing one translational degree of freedom and one rotational degree of freedom. The spherical sliding part 511 is forcibly aligned with the movement direction by the guide part 31, eliminating lateral offset. The cylindrical end allows rotation around the axis to compensate for installation errors, forming a hybrid constraint system to avoid jamming caused by over-constraint. When the aerial work platform shakes and the operator pushes the moving rod 51 to generate an oblique impact force, the spherical sliding part 511 is constrained by the guide part 31, decomposing the oblique force into an axial movement component and a lateral component, which are respectively used for triggering disengagement and absorbed by the guide part 31. The rotational degree of freedom of the cylindrical end allows the rod to be finely adjusted around the axis, avoiding the rod being subjected to combined bending and torsional stresses due to rigid constraints at both ends. The cylindrical end retains a rotational degree of freedom to prevent the spring plunger from misaligning and jamming with the limiting hole 6 due to track parallelism errors, improving the responsiveness and success rate during triggering.

[0033] In order to make the moving rod 51 travel along a predetermined route, the second track 4 is provided with an inclined guide plate 41 at the end near the platform, and the inclined guide plate 41 is inclined in a vertically downward direction.

[0034] To stop the spring plunger, a stop screw 7 is also included, which passes through the end of the moving rod 51 on the side where the inductive switch 8 is located and abuts against the outer circumferential surface of the spring plunger inside it. To install the stop screw 7, mounting holes can be provided on the mounting bracket 2 to facilitate its installation.

[0035] 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.

[0036] 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. An anti-pinch device for a work platform, characterized in that: The system includes a mounting frame (2) symmetrically mounted on a platform column (1), a first track (3) and a second track (4) respectively mounted on the mounting frame (2), a sliding component (5) slidably mounted on the first track (3) and the second track (4), and an induction switch (8) mounted at the bottom of the second track (4). The sliding component (5) includes a sliding rod (51), with both ends of the sliding rod (51) slidably connected to the first track (3) and the second track (4) respectively. The first track (3) and the second track (4) are inclined along the direction of human body tilting. The straight distance from the end of the first track (3) and the second track (4) near the platform along the direction of human body tilting to the platform column (1) near the platform is greater than the diameter of the end of the sliding rod (51).

2. The anti-pinch device for the work platform according to claim 1, characterized in that: It also includes limiting holes (6) respectively set on the mounting bracket (2). The moving component (5) also includes elastic limiting parts (52) installed at both ends of the moving rod (51). The elastic limiting parts (52) abut against the limiting holes (6). When the moving rod (51) is pushed, the elastic limiting parts (52) and the limiting holes (6) are squeezed and contracted, so that the moving rod (51) moves along the first track (3) and the second track (4) and then falls off.

3. The anti-pinch device for the work platform according to claim 2, characterized in that: The elastic limiting part (52) is a spring plunger. The mounting end of the spring plunger is connected to the internal thread of one end of the moving rod (51). The telescopic end of the spring plunger abuts against the limiting hole (6).

4. The anti-pinch device for the work platform according to claim 3, characterized in that: The limiting hole (6) is provided with a guide angle (61) on the side near the moving rod (51), and the spring plunger abuts against the guide angle (61).

5. The anti-pinch device for the work platform according to claim 3, characterized in that: A spherical sliding part (511) is provided at one end of the movable rod (51) located on one side of the first track (3). A guide part (31) is provided on the first track (3). The spherical sliding part (511) slides along the guide part (31) on the first track (3). The spring plunger is provided inside the spherical sliding part (511).

6. The anti-pinch device for the work platform according to claim 5, characterized in that: The second track (4) is provided with an inclined guide plate (41) at the end near the platform, and the inclined guide plate (41) is inclined in a vertically downward direction.

7. The anti-pinch device for the work platform according to claim 5, characterized in that: It also includes a stop screw (7), which passes through the end of the moving rod (51) on the side where the inductive switch (8) is located and abuts against the outer circumferential surface of the spring plunger inside it.

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