High-altitude operation machine and anti-collision device thereof

Abstract

The utility model belongs to the technical field of high-altitude operation mechanical equipment, and particularly relates to a high-altitude operation machine and an anti-collision device thereof. The anti-collision device comprises a telescopic sleeve assembly, a trigger piece, an elastic reset piece and a limiting switch, the telescopic sleeve assembly comprises a short sleeve and a movable rod which are matched in a telescopic mode in the vertical direction, and the top end of the movable rod stretches out of the short sleeve and stretches out to the position above the working platform; the trigger piece extends out of the movable rod; the limiting switch is installed on the short sleeve and used for being electrically connected with a lifting mechanism of the high-altitude operation machine, the limiting switch is located below the triggering piece, and a contact of the limiting switch can reach the switching position under pressing triggering of the triggering piece so as to send out a work stopping signal aiming at the lifting mechanism. In the process that the lifting mechanism drives the working platform to ascend, the movable rod replaces a contact of the limiting switch to make direct contact with an obstacle, so that the damage risk of the limiting switch is reduced, and the service life of the anti-collision device is prolonged.

Description

Aerial work machinery and its collision avoidance devices Technical Field

[0001] This application belongs to the technical field of aerial work machinery and equipment, specifically relating to an aerial work machine and its anti-collision device. Background Technology

[0002] Aerial work platforms are mainly used for construction work at height. If an aerial work platform collides with an obstacle, it can lead to a more serious safety accident than ground work platforms. This is especially true for aerial work vehicles, as workers need to stand on the platform. Therefore, it is extremely important to avoid collisions between the platform and obstacles.

[0003] In existing technologies, anti-collision devices are used to prevent the work platform from colliding with obstacles. Specifically, the anti-collision device includes a limit switch that controls the start and stop of the lifting mechanism of the aerial work platform. The contacts of the limit switch take priority in colliding with the obstacle before the work platform does, thus stopping the operation of the lifting mechanism and preventing the work platform from continuing to move and colliding with the obstacle. However, with the aforementioned technologies, long-term direct collisions between the limit switch and the obstacle can easily lead to pressure damage to the limit switch, thereby affecting the service life of the anti-collision device. Summary of the Invention

[0004] The purpose of this application is to provide an aerial work platform and its anti-collision device, which helps to extend the service life of the anti-collision device.

[0005] To achieve the above objectives, this application provides a collision avoidance device for aerial work machinery, the collision avoidance device comprising:

[0006] A telescopic sleeve assembly is used to be installed on the working platform of the aerial work machine. The telescopic sleeve assembly includes a short sleeve that telescopically engages in the vertical direction and a movable rod. The top end of the movable rod extends out of the short sleeve and extends above the working platform.

[0007] A trigger extends from the movable rod;

[0008] An elastic reset element is used to apply a bottom-up reset force to the trigger element.

[0009] A limit switch is installed on the short sleeve and is used to electrically connect the lifting mechanism of the aerial work platform. The limit switch is located below the trigger element. The contacts of the limit switch can reach a switching position under the pressure trigger of the trigger element to issue a stop signal for the lifting mechanism.

[0010] In some embodiments, the short sleeve has a limiting opening extending in the vertical direction, and the trigger extends out of the short sleeve through the limiting opening.

[0011] In some embodiments, the limit switch contacts include extreme positions for pressure-induced movement, and the trigger includes a stop position that engages with the lower edge of the limit port, the stop position corresponding to the limit switch contacts being located between the switching position and the extreme position.

[0012] In some embodiments, the movable rod includes a sleeve portion and a telescopic portion coaxially sleeved together. The axial length of the telescopic portion is greater than the axial length of the sleeve portion. The sleeve portion is sleeved outside the telescopic portion, and the short sleeve is sleeved outside the sleeve portion. The trigger element is disposed on the outer peripheral wall of the sleeve portion. The telescopic portion and the sleeve portion are movable and cooperate in the vertical direction to adjust the vertical distance between the upper end of the telescopic portion and the trigger element.

[0013] In some embodiments, bolt holes are provided on the outer peripheral wall of the sleeve, and nuts are welded to the bolt holes. The nuts are located above the trigger element, and the anti-collision device also includes a wing bolt that is threaded into the nut.

[0014] In some embodiments, the upper end of the short sleeve is provided with an upper cover plate, the lower end of the short sleeve is provided with a lower cover plate, the movable rod passes through the upper cover plate and the lower cover plate, and the elastic reset member includes a spring sleeved on the movable rod, one end of the spring is connected to the trigger member, and the other end of the spring is connected to the lower cover plate.

[0015] In some embodiments, the lower cover plate has a large circular hole for the movable rod to pass through and several small circular holes located outside the large circular hole.

[0016] In some embodiments, the anti-collision device further includes a ring clamp, which includes a U-shaped portion and two connecting portions disposed at both ends of the U-shaped portion. The U-shaped groove of the U-shaped portion is used to cover the guardrail tube of the work platform, and the connecting portions are used to be bolted to the outer peripheral wall of the short sleeve.

[0017] In some embodiments, the trigger includes a pressure plate disposed on the outer peripheral wall of the movable rod. The pressure plate includes a sleeve portion, a transition portion, and a trigger portion. The transition portion connects the trigger portion and the sleeve portion. The width of the transition portion is smaller than the width of the trigger portion and smaller than the width of the sleeve portion. The sleeve portion is sleeved on the outer peripheral wall of the movable rod. The trigger portion is located above the limit switch.

[0018] Another aspect of this application provides an aerial work platform, including the anti-collision device for the aerial work platform as described above.

[0019] Through the above technical solution, the aerial work platform and its anti-collision device provided in this application have the following characteristics:

[0020] Beneficial effects:

[0021] The lifting mechanism of aerial work platform machinery is used to drive the work platform to a target height. A telescopic sleeve assembly is mounted on the work platform, and a movable rod extends from the platform. When the work platform rises too close to an obstacle above, the movable rod collides with the obstacle before the work platform does. After the collision, the movable rod moves downwards, causing a trigger to move towards a limit switch until the trigger pushes the limit switch contacts to the switching position, sending a stop signal to the lifting mechanism. This stops the lifting mechanism from further driving the work platform upwards, thus preventing a collision between the work platform and the obstacle. In this application, the direct collision between the movable rod and the obstacle replaces the direct collision between the limit switch contacts and the obstacle, thereby reducing the risk of damage to the limit switch due to direct collision and extending the service life of the anti-collision device.

[0022] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0024] Figure 1 is a perspective view of the anti-collision device according to a specific embodiment of this application;

[0025] Figure 2 is a cross-sectional view of the anti-collision device according to a specific embodiment of this application;

[0026] Figure 3 is a perspective view of the sleeve portion according to a specific embodiment of this application;

[0027] Figure 4 is a plan view of one side of the short sleeve (without top cover) limit switch according to a specific embodiment of this application;

[0028] Figure 5 is a top view of the short sleeve (without a top cover) according to a specific embodiment of this application;

[0029] Figure 6 is a plan view of one side of the short sleeve (without top cover) ring according to a specific embodiment of this application.

[0030] Explanation of reference numerals in the attached figures

[0031] 100. Anti-collision device; 1. Limit switch; 2. Short sleeve; 21. Limit port; 3. Pressure plate; 4. Telescopic part; 5. Sleeve part; 6. Wing bolt; 7. Spring; 8. Upper cover plate; 9. Lower cover plate; 91. Small round hole; 92. Large round hole; 10. Ring hoop. Detailed Implementation

[0032] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0033] The terminology section of the aerial work platform and its anti-collision device according to this application is described below with reference to the accompanying drawings.

[0034] As shown in Figure 1, a specific embodiment of this application provides an anti-collision device 100 for aerial work platforms. The anti-collision device 100 includes a telescopic sleeve assembly, a trigger, an elastic reset member, and a limit switch 1. The telescopic sleeve assembly is used to be installed on the working platform of the aerial work platform. The telescopic sleeve assembly includes a short sleeve 2 that telescopically engages in the vertical direction and a movable rod. The top end of the movable rod extends out of the short sleeve 2 and extends above the working platform. The trigger extends from the movable rod. The elastic reset member is used to apply a bottom-up reset force to the trigger. The limit switch 1 is installed on the short sleeve 2 and is used to electrically connect to the lifting mechanism of the aerial work platform. The limit switch 1 is located below the trigger. The contacts of the limit switch 1 can reach a switching position under the pressure trigger of the trigger to issue a stop signal for the lifting mechanism.

[0035] The aerial work platform includes a lifting mechanism and a working platform. The working platform carries workers to perform aerial work, and the lifting mechanism raises the working platform to the working height. During the lifting process, if the working platform gets too close to an obstacle above, the movable rod collides with the obstacle before the working platform. The movable rod is pushed downward by the obstacle, causing the trigger to move towards the limit switch 1 until the trigger switches the contacts of the limit switch 1 to the switching position. This causes the limit switch 1 to issue a stop signal to the lifting mechanism, thus stopping the lifting mechanism from continuing to rise and preventing the working platform from colliding with the obstacle. Since excessive impact force can easily damage the limit switch 1, this application uses direct contact between the movable rod and the obstacle to trigger the limit switch 1, instead of triggering it through direct contact between the contacts and the obstacle. This reduces the risk of damage to the limit switch 1 and extends the service life of the anti-collision device 100.

[0036] Furthermore, after the movable rod collides with the obstacle, it drives the trigger element to move towards the limit switch 1, and the trigger element directly contacts the contact of the limit switch 1. Since the movable rod needs to make direct contact with the obstacle, it needs to have high strength. However, since the trigger element is in direct contact with the limit switch 1, it can be made of a material with weaker rigidity and hardness than the movable rod to buffer the collision between the trigger element and the contact of the limit switch 1, thereby further extending the service life of the anti-collision device 100.

[0037] Meanwhile, the short sleeve 2 installs the limit switch 1 and the trigger on the work platform and guides the movement of the movable rod.

[0038] Furthermore, the elastic reset component acts as a buffer when the movable rod collides with an obstacle and causes the trigger component to move toward the limit switch 1, thereby reducing the collision between the trigger component and the contact of the limit switch 1, thus reducing the risk of damage to the limit switch 1 and extending the service life of the anti-collision device 100.

[0039] Furthermore, simultaneously, after the contact of limit switch 1 is pressed downward by the trigger to reach the switching position, the lifting mechanism stops lifting the work platform. At this time, the operator can independently control the lifting mechanism to lower the work platform to a suitable working height. During the descent of the work platform, the elastic reset component applies a reset force to the trigger, causing the trigger to move upward and release the pressure on the contact of limit switch 1, thereby realizing the automatic reset of the anti-collision device 100. This facilitates the anti-collision device 100 to perform the next anti-collision action, improving convenience.

[0040] It should be noted that the structure and working principle of the limit switch 1 are well known to those skilled in the art and are not part of the core utility model of this application, so they will not be described in detail here.

[0041] In some implementations, the contacts of the limit switch 1 include at least an initial position, a switching position, and an extreme position. The initial position corresponds to the limit switch 1 being in a normal state, and the switching position corresponds to the limit switch 1 issuing a stop working signal. When the contacts of the limit switch 1 reach the extreme position, if the contacts of the limit switch 1 are pressed further, the limit switch 1 may be easily damaged.

[0042] Specifically, the movement path of the trigger includes an initial position, a trigger position, and a stop position. The initial position corresponds to the contact of limit switch 1 being in the initial position, the trigger position corresponds to the contact of limit switch 1 being in the switching position, and the stop position corresponds to the contact of limit switch 1 being between the switching position and the extreme position.

[0043] Furthermore, a limiting opening 21 extending in the vertical direction is provided on the short sleeve 2. The trigger extends out of the short sleeve 2 through the limiting opening 21. The limiting opening 21 is used to limit the range of movement of the trigger in the vertical direction. When the trigger is in the stop position, it is limited and engaged with the lower edge of the limiting opening 21. In this application, the limiting opening 21 is provided to prevent the trigger from pushing the contact of the limit switch 1 to the limit position, thereby reducing the risk of damage to the limit switch 1 and extending the service life of the anti-collision device 100. The upper edge of the limiting opening 21 is used to limit the maximum upward movement of the trigger, thereby limiting the maximum upward movement distance of the movable rod and preventing the movable rod from separating from the short sleeve 2.

[0044] In some embodiments, the height of the limit port 21 in the vertical direction is greater than the vertical distance between the initial position and the end position. In other words, when the upper surface of the trigger abuts against the upper edge of the limit port 21, the trigger is located in the initial position or the trigger is located above the initial position. It can be seen that the trigger can push the contact of the limit switch 1 from the initial position to the switching position under the action of the movable rod, which helps to improve the reliability of the anti-collision device.

[0045] As shown in Figures 1 and 2, in some embodiments, the movable rod includes a sleeve portion 5 and a telescopic portion 4 coaxially sleeved together. The axial length of the telescopic portion 4 is greater than the axial length of the sleeve portion 5. The sleeve portion 5 is sleeved outside the telescopic portion 4, and the short sleeve 2 is sleeved outside the sleeve portion 5. The trigger element is disposed on the outer peripheral wall of the sleeve portion 5. The axial direction of the short sleeve 2 and the movable rod is vertical. The telescopic portion 4 and the sleeve portion 5 are axially movable to adjust the axial distance between the upper end of the telescopic portion 4 and the trigger element in the vertical direction.

[0046] Different working conditions impose different distance restrictions between the working platform and obstacles, that is, the length of the extension part 4 extending out of the working platform varies. However, the range of motion of the sleeve part 5 is limited by the size of the limiting port 21. Adjusting only the vertical position of the sleeve part 5 is not enough to give the extension part 4 a large adjustment range. Therefore, by setting the extension part 4 and the sleeve part 5 to move in the axial direction, the adjustment range of the length of the extension part 4 extending out of the working platform is increased, so as to be suitable for different working conditions and thus improve the applicability of the anti-collision device 100.

[0047] Specifically, bolt holes are provided on the outer peripheral wall of the sleeve part 5, and nuts are welded to the bolt holes. The anti-collision device 100 also includes a wing bolt 6 that is threaded with the nut. After the telescopic part 4 is pulled out of the sleeve part 5 so that the telescopic part 4 extends out of the working platform to the preset length, the wing bolt 6 is screwed in to press against the telescopic part 4 to fix the relative position of the telescopic part 4 to the sleeve part 5, so as to complete the adjustment of the telescopic part 4. The whole adjustment process is simple to operate and the adjustment speed is relatively fast.

[0048] Furthermore, both the telescopic part 4 and the sleeve part 5 are hollow round tubes. The outer diameter of the telescopic part 4 is 1mm to 2mm smaller than the inner diameter of the sleeve part 5. The use of hollow round tubes can effectively reduce the weight. The end of the telescopic part 4 is provided with a rubber pad to buffer the collision between the obstacle and the telescopic part 4.

[0049] As shown in Figure 3, in some embodiments, the pressure plate 3 is located below the nut on the sleeve part 5. The pressure plate 3 includes a sleeve part, a transition part and a trigger part. The sleeve part is sleeved on the outer peripheral wall of the sleeve part 5 of the movable rod and welded together. The trigger part is located directly above the limit switch 1. The transition part connects the trigger part and the sleeve part. The width of the transition part is smaller than the width of the trigger part and smaller than the width of the sleeve part, so as to achieve a lightweight design.

[0050] As shown in Figures 4 to 6, in some embodiments, the short sleeve 2 and the movable rod are arranged coaxially at intervals. The upper end of the short sleeve 2 is provided with an upper cover plate 8, and the lower end of the short sleeve 2 is provided with a lower cover plate 9. The movable rod passes through the upper cover plate 8 and the lower cover plate 9. The elastic reset member includes a spring 7 sleeved on the movable rod. One end of the spring 7 is connected to the sleeve part of the pressure plate 3, and the other end of the spring 7 is connected to the lower cover plate 9.

[0051] Specifically, the short sleeve 2 is a square tube, and both the upper cover plate 8 and the lower cover plate 9 are provided with large round holes 92. The diameter of the large round holes 92 is 1mm to 2mm larger than the outer diameter of the sleeve part 5. The gap between the short sleeve 2 and the movable rod is larger than the size of the spring 7 to avoid interference with the extension and contraction of the spring 7.

[0052] Furthermore, small round holes 91 are provided at the four corners of the lower cover plate 9.

[0053] As shown in Figures 1 and 2, in some embodiments, the outer peripheral wall of the short sleeve 2 is provided with a ring hoop 10 for fitting onto the guardrail pipe of the work platform.

[0054] Specifically, the limit switch 1 and the ring clamp 10 are respectively installed on two opposite sides of the short sleeve 2 to avoid the limit switch 1 interfering with the installation of the ring clamp 10.

[0055] Furthermore, the ring hoop 10 includes a U-shaped part and two connecting parts located at both ends of the U-shaped part. The size of the U-shaped groove of the U-shaped part matches the size of the guardrail tube of the work platform, and the connecting parts are bolted to the short sleeve 2.

[0056] A specific embodiment of this application also provides an aerial work platform, including the anti-collision device 100 of the aerial work platform as described above. Since the aerial work platform employs all embodiments of the anti-collision device 100, it possesses all the beneficial effects of the anti-collision device 100.

[0057] It should be noted that the aerial work machinery mentioned in this application can be aerial work vehicles, aerial work platforms, etc.

[0058] Taking an aerial work platform as an example, the aerial work platform includes a lifting mechanism and a working platform. A short sleeve 2 is installed on the guardrail of the working platform via a ring clamp 10. A movable rod is movably inserted through the short sleeve 2. A limit switch 1 is installed on the short sleeve 2 and aligned with the trigger on the movable rod. During the lifting process of the lifting mechanism raising the working platform, the movable rod rises with the lifting mechanism until it encounters an obstacle above. The obstacle pushes the movable rod, causing the trigger to press against the contact of the limit switch 1. When the contact of the limit switch 1 reaches the switching position, the limit switch 1 stops the lifting mechanism from working. Throughout the process, the contact of the limit switch 1 does not directly contact the obstacle, but the movable rod is designed to directly contact the obstacle, thereby reducing the risk of damage to the limit switch 1 and extending the service life of the anti-collision device 100.

[0059] In the description of this application, it should be understood that 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A collision avoidance device for aerial work machinery, characterized in that, The anti-collision device (100) includes: a telescopic sleeve assembly for installation on the working platform of the aerial work machine, the telescopic sleeve assembly including a short sleeve (2) that telescopically engages in the vertical direction and a movable rod, the top end of the movable rod extending out of the short sleeve (2) and extending above the working platform; a trigger element extending from the movable rod; an elastic reset element for applying a bottom-up reset force to the trigger element; and a limit switch (1) installed on the short sleeve (2) and used to electrically connect to the lifting mechanism of the aerial work machine, the limit switch (1) being located below the trigger element, the contact of the limit switch (1) being able to reach a switching position under the pressure trigger of the trigger element to issue a stop working signal for the lifting mechanism.

2. The anti-collision device for aerial work machinery according to claim 1, characterized in that, The short sleeve (2) has a limiting port (21) extending in the vertical direction, and the trigger extends out of the short sleeve (2) through the limiting port (21).

3. The anti-collision device for aerial work machinery according to claim 2, characterized in that, The contact of the limit switch (1) includes a limit position for pressure movement, and the trigger includes a stop position that cooperates with the lower edge of the limit port (21). The stop position corresponds to the contact of the limit switch (1) being located between the switching position and the limit position.

4. The anti-collision device for aerial work machinery according to claim 1, characterized in that, The movable rod includes a sleeve portion (5) and a telescopic portion (4) coaxially sleeved together. The axial length of the telescopic portion (4) is greater than the axial length of the sleeve portion (5). The sleeve portion (5) is sleeved outside the telescopic portion (4). The short sleeve (2) is sleeved outside the sleeve portion (5). The trigger is disposed on the outer peripheral wall of the sleeve portion (5). The telescopic portion (4) and the sleeve portion (5) can move and cooperate in the vertical direction to adjust the vertical distance between the upper end of the telescopic portion (4) and the trigger.

5. The anti-collision device for aerial work machinery according to claim 4, characterized in that, Bolt holes are provided on the outer peripheral wall of the sleeve part (5), and nuts are welded to the bolt holes. The nuts are located above the trigger element. The anti-collision device (100) also includes a wing bolt (6) that is threaded with the nut.

6. The anti-collision device for aerial work machinery according to claim 1, characterized in that, The upper end of the short sleeve (2) is provided with an upper cover plate (8), and the lower end of the short sleeve (2) is provided with a lower cover plate (9). The movable rod passes through the upper cover plate (8) and the lower cover plate (9). The elastic reset member includes a spring (7) sleeved on the movable rod. One end of the spring (7) is connected to the trigger member, and the other end of the spring (7) is connected to the lower cover plate (9).

7. The anti-collision device for aerial work machinery according to claim 6, characterized in that, The lower cover plate (9) has a large circular hole (92) for the movable rod to pass through, and several small circular holes (91) located outside the large circular hole (92).

8. The anti-collision device for aerial work machinery according to any one of claims 1 to 7, characterized in that, The anti-collision device (100) also includes a ring hoop (10), which includes a U-shaped part and two connecting parts disposed at both ends of the U-shaped part. The U-shaped groove of the U-shaped part is used to cover the guardrail tube of the working platform, and the connecting parts are used to be bolted to the outer peripheral wall of the short sleeve (2).

9. The anti-collision device for aerial work machinery according to any one of claims 1 to 7, characterized in that, The triggering element includes a pressure plate (3) disposed on the outer peripheral wall of the movable rod. The pressure plate (3) includes a sleeve part, a transition part and a trigger part. The transition part connects the trigger part and the sleeve part. The width of the transition part is smaller than the width of the trigger part and smaller than the width of the sleeve part. The sleeve part is sleeved on the outer peripheral wall of the movable rod. The trigger part is located above the limit switch (1).

10. An aerial work platform, characterized in that, Includes a collision avoidance device (100) for aerial work machinery according to any one of claims 1 to 9.

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