Overload detection device for boom of aerial work platform

Abstract

The utility model discloses an aerial work platform cantilever crane overload detection device which comprises a work platform and a cantilever crane which is connected with one side of the work platform and used for controlling the work platform to keep stable, a cylinder body is arranged at the top of the cantilever crane, a movable piston is arranged in the cylinder body, the work platform is in transmission connection with the piston through a noose, and the noose is connected with the cantilever crane. The noose is located above the joint of the working platform and the arm frame, and a displacement sensor is arranged at the joint of the end of the noose and the piston. The utility model has the characteristics that whether the cantilever crane is overloaded or not can be timely detected and fed back, the auxiliary supporting strength is increased, the damage caused by overload is avoided, and the safety of the aerial work platform is improved.

Description

Technical Field

[0001] This utility model relates to an overload detection device, specifically an overload detection device for the boom of an aerial work platform. Background Technology

[0002] As a key component of aerial work platforms, the boom's load-bearing capacity and stability directly affect the safety of workers. During aerial work, the boom needs to withstand various loads, including the weight of personnel, equipment, and tools on the platform, as well as wind loads and inertial forces. Inspecting the boom ensures its safe and reliable operation under various working conditions, providing workers with a stable and safe working environment.

[0003] In existing technologies, information on whether an aerial work platform is overloaded cannot be received in real time, resulting in a delay. If the aerial work platform is raised while overloaded, the untimely response may lead to boom breakage or the aerial work platform tipping over, causing danger. Utility Model Content

[0004] The purpose of this utility model is to provide an overload detection device for aerial work platform booms, which solves the problems of existing technologies, such as the inability to provide timely feedback on boom overload detection, which poses a danger.

[0005] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: an overload detection device for a boom of an aerial work platform, comprising a work platform and a boom connected to one side of the work platform and used to control the work platform to maintain stability. The top of the boom is provided with a cylinder, and a movable piston is provided in the cylinder. The work platform is connected to the piston via a winch. The winch is located above the connection between the work platform and the boom, and a displacement sensor is provided at the connection between the end of the winch and the piston.

[0006] As a further preferred technical solution of this utility model; the cylinder end is provided with an end cover, and the piston end face is provided with a guide post that extends through the end cover to the cylinder body and is connected to the end of the winch, and the guide post and the end cover are sealed and slidably fitted.

[0007] As a further preferred technical solution of this utility model, the cylinder chamber is filled with hydraulic oil, and the piston is provided with at least one through hole along the thickness direction.

[0008] As a further preferred technical solution of this utility model; one end of the guide post connected to the cable is provided with an annular protrusion, and a compression spring is sleeved on the guide post, one end of the compression spring is connected to the end face of the annular protrusion, and the other end of the compression spring is connected to the end cap.

[0009] As a further preferred technical solution of this utility model; the cylinder body is fixed to the top surface of the boom by bolts, the guide column is parallel to the boom and facing the working platform, and the displacement sensor is located on the end face of the annular protrusion facing the end cover.

[0010] As a further preferred technical solution of this utility model, a first guide wheel is provided on the top surface of the boom at the axial position corresponding to the cylinder body, and a second guide wheel is provided on the side wall of the working platform in the same direction as the first guide wheel. The winch passes through the lower side of the first guide wheel and the upper side of the second guide wheel in sequence.

[0011] As a further preferred technical solution of this utility model; the first guide wheel is located on the top of the first bracket, the bottom of the first bracket is provided with a turntable that is rotatably connected to the top surface of the boom, and the second guide wheel is located on the top of the second bracket.

[0012] Therefore, this utility model has the characteristics of timely detection and feedback on whether the boom is overloaded and increasing the strength of auxiliary support to avoid damage due to overload and improve the safety of the aerial work platform. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 A cross-sectional view of the cylinder block.

[0015] Reference numerals: 1. Working platform; 2. Boom; 21. Cylinder; 22. Piston; 221. Through hole; 24. End cap; 25. Guide post; 251. Annular protrusion; 252. Compression spring; 12. Windlass; 13. Displacement sensor; 26. First guide wheel; 261. First bracket; 262. Turntable; 14. Second guide wheel; 141. Detailed Implementation

[0016] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0017] like Figure 1-2As shown, an overload detection device for an aerial work platform boom includes a work platform 1 and a boom 2 connected to one side of the work platform 1 and used to control the work platform 1 to maintain stability. A cylinder 21 is located at the top of the boom 2. The boom 2 and the work platform 1 are connected by a cylinder or similar structure, which can drive the work platform 1 to maintain a stable state, facilitating operator control. A movable piston 22 is located inside the cylinder 21, abutting against the inner wall of the cylinder 21 and sliding freely axially. The work platform 1 is connected to the piston 22 via a winch 12. The winch 12 is located above the connection point between the work platform 1 and the boom 2. A displacement sensor 13 is located at the connection point between the end of the winch 12 and the piston 22. The displacement sensor 13 is existing technology and will not be described in detail here. When the work platform 1 is initially raised, to maintain stability, the work platform 1 needs to be rotated, either vertically or horizontally. Rotation of the work platform 1 pulls the winch. 12. This causes the winch 12 to drive the piston 22 to move within the cylinder 21. If the work platform 1 is overloaded, the rotation speed of the work platform 1 will decrease, and the winch 12 will be pulled by the piston 22. The displacement sensor 13 will detect that the displacement speed of the piston 22 is outside the normal range, thus detecting that the work platform 1 is overloaded. If the displacement sensor 13 detects that the displacement speed of the piston 22 is within the normal range, then the work platform 1 is not overloaded. At the same time, when the piston 22 moves, it can increase the damping effect, strengthen the support strength of the boom 2 and the end connection of the boom 2 for the work platform 1, reduce the burden on the boom 2 and the end connection of the boom 2, and avoid sudden damage to the boom 2. The chamber of the cylinder 21 is filled with hydraulic oil. The piston 22 has two through holes 221 along the thickness direction. When the piston 22 moves, the hydraulic oil flows from the through holes 221, allowing the piston 22 to slide normally in the chamber of the cylinder, playing a lubricating and buffering role, and strengthening the damping strength.

[0018] like Figure 2As shown, the cylinder body 21 has an end cap 24 at its end, which is sealed to the cylinder body 21 and can be welded or bolted. The piston 22 has a guide post 25 on its end face, extending through the end cap 24 to the outside of the cylinder body 21 and connected to the end of the winch 12. One end of the guide post 25 is connected to the end face of the piston 22, and the other end extends through the end cap 24 to the outside of the cylinder body 21 and connects to the winch 12. The guide post 25 and the end cap 24 are sealed and slidably fitted. The end of the guide post 25 connected to the winch 12 has an annular protrusion 251, and a compression spring 252 is fitted on the guide post 25. One end of the compression spring 252 is connected to the end face of the annular protrusion 251, and the other end is connected to the end cap 24. When the piston 22 is pulled and moved by the winch 12, if the working platform 1 returns... When the cable 12 returns to its original position, it begins to loosen. At this time, the compression spring 252 acts on the guide post 25 through the annular protrusion 251, causing the guide post 25 to drive the piston 22 back, thereby tightening the cable 12 again. This prevents the cable 12 from loosening and drooping and getting tangled, which would affect the normal operation of the cable 12. At the same time, it ensures that the piston 22 can move back and forth normally to continuously play a damping role. The cylinder 21 is fixed to the top surface of the boom 2 with bolts. The guide post 25 is parallel to the boom 2 and faces the working platform 1. The displacement sensor 13 is located on the end face of the annular protrusion 251 facing the end cover 24. The end of the guide post 25 faces the working platform 1 to avoid the force acting on the cable 12 and the guide post 25 from shifting and causing damage to the components, thus ensuring the uniformity and stability of the force.

[0019] like Figure 1 As shown, a first guide wheel 26 is provided on the top surface of the boom 2 at the axial position corresponding to the cylinder 21. A second guide wheel 14 is provided on the side wall of the working platform 1, which is arranged in the same direction as the first guide wheel 26. Both the first guide wheel 26 and the second guide wheel 14 are existing technologies, and their axes are parallel. The side wall is provided with a recess to accommodate the winch 12. The winch 12 passes through the lower side of the first guide wheel 26 and the upper side of the second guide wheel 14 in sequence. It is kept taut by the action of the first guide wheel 26 and the second guide wheel 14 to prevent the winch 12 from slackening and tangling, and also to guide the winch 12. The first guide wheel 26 is located on the first bracket 261. At the top, the bottom of the first support 261 is provided with a turntable 262 that is rotatably connected to the top surface of the boom 2. The second guide wheel 14 is located on the top of the second support 141. The turntable 262 is provided so that when the working platform 1 rotates horizontally, the winch 12 can rotate through the turntable 262 under the guidance of the second guide wheel 14. This keeps the axes of the first guide wheel 26 and the second guide wheel 14 parallel to each other, thereby ensuring the smooth movement of the winch 12 and preventing the winch 12 from twisting relative to each guide wheel and detaching from the first guide wheel 26 or the second guide wheel 14. It also prevents uneven force from causing the winch 12 to break or the guide wheels to be damaged.

[0020] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. An overload detection device for an aerial work platform boom, comprising a work platform (1) and a boom (2) connected to one side of the work platform (1) and used to control the work platform (1) to maintain stability, characterized in that: The boom (2) is provided with a cylinder (21) at the top, and a movable piston (22) is provided inside the cylinder (21). The working platform (1) is connected to the piston (22) via a winch (12). The winch (12) is located above the connection between the working platform (1) and the boom (2). A displacement sensor (13) is provided at the connection between the end of the winch (12) and the piston (22).

2. The aerial work platform boom overload detection device according to claim 1, characterized in that: The cylinder (21) is provided with an end cap (24) at its end. The piston (22) has a guide post (25) on its end face that extends through the end cap (24) to the outside of the cylinder (21) and is connected to the end of the winch (12). The guide post (25) and the end cap (24) are sealed and slidably fitted.

3. The aerial work platform boom overload detection device according to claim 1, characterized in that: The cylinder (21) is filled with hydraulic oil, and the piston (22) has at least one through hole (221) along the thickness direction.

4. The aerial work platform boom overload detection device according to claim 2, characterized in that: The guide post (25) has an annular protrusion (251) at one end connected to the cable (12), and a compression spring (252) is sleeved on the guide post (25). One end of the compression spring (252) is connected to the end face of the annular protrusion (251), and the other end of the compression spring (252) is connected to the end cap (24).

5. The aerial work platform boom overload detection device according to claim 2, characterized in that: The cylinder (21) is fixed to the top surface of the boom (2) by bolts. The guide column (25) is parallel to the boom (2) and faces the working platform (1). The displacement sensor (13) is located on the end face of the annular protrusion (251) facing the end cover (24).

6. The aerial work platform boom overload detection device according to claim 1, characterized in that: The boom (2) is provided with a first guide wheel (26) at the axial position of the cylinder (21) on its top surface. The working platform (1) is provided with a second guide wheel (14) arranged in the same direction as the first guide wheel (26) on its side wall. The winch (12) passes through the lower side of the first guide wheel (26) and the upper side of the second guide wheel (14) in sequence.

7. The aerial work platform boom overload detection device according to claim 6, characterized in that: The first guide wheel (26) is located on the top of the first bracket (261), the bottom of the first bracket (261) is provided with a turntable (262) that is rotatably connected to the top surface of the boom (2), and the second guide wheel (14) is located on the top of the second bracket (141).

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