A lifting arm locking structure

Abstract

The utility model is applicable to the technical field of lifting arms, and provides a lifting arm locking structure, comprising: a connecting shaft, wherein both ends of the connecting shaft are respectively rotatably connected to a fixed plate; a buffer group is arranged on the connecting shaft, wherein the buffer group comprises a buffer block fixedly connected to the connecting shaft, a rotating shaft rotatably connected to the fixed plate, a cam fixedly connected to the rotating shaft, and a friction block arranged between the buffer block and the cam, wherein the friction block is provided with a cylinder, wherein the cylinder is slidably connected to a support block, wherein the support block is fixed to the fixed plate, wherein an elastic member is arranged on the outer sleeve of the cylinder, and the cam and the buffer block are respectively abutted on two sides of the friction block; the beneficial effects of the utility model: the buffer group can slow down the rotation speed of the connecting shaft, thereby avoiding the problem of unstable moving speed during the initial movement of the lifting arm, and improving the moving stability of the lifting arm.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting arms, in particular to a locking structure of a lifting arm. Background Art

[0002] The articulated boom lift is a lifting device used for aerial work. It can cross obstacles for aerial work. Adjacent articulated booms are usually equipped with hydraulic telescopic cylinders to achieve the lifting function. However, when the hydraulic telescopic cylinders are worn out or the pressure is unstable due to long-term use, the speed of the articulated boom is unstable during the initial movement. After the articulated boom is fully extended, the support is unstable when the equipment moves, resulting in large vibrations of the lifting platform. There are safety hazards during aerial work. Please refer to the attached Figure 5 and attached Figure 6 The existing lifting arm realizes the locking function through two locking plates. When the lifting arm initially moves, the problem of unstable moving speed is prone to occur. Now this structure is improved.

[0003] A Chinese patent with patent publication number CN218950968U discloses a crank arm lift, comprising a base, a storage slot is provided in the middle of the lower end of the base, a positioning mechanism is provided in the storage slot, a No. 1 vertical pole is fixedly installed on the upper end of the base, a No. 1 adjusting rod is movably installed on the upper part of the No. 1 vertical pole, a No. 1 electric telescopic rod is movably installed in the No. 1 vertical pole, the upper part of the No. 1 electric telescopic rod is movably installed with the No. 1 adjusting rod, a No. 2 vertical pole is movably installed on the side of the No. 1 adjusting rod away from the No. 1 vertical pole, a No. 2 adjusting rod is movably installed on the upper part of the No. 2 vertical pole, a No. 3 vertical pole is movably installed on the side of the No. 2 adjusting rod away from the No. 2 vertical pole, and a workbench is fixedly installed on the upper end of the No. 3 vertical pole; however, after the crank arm of the above-mentioned lift is fully extended, there is a phenomenon that the support is unstable when the equipment moves, resulting in a slight rotation of the crank arm connection, which causes a large shaking of the lifting platform and poses a safety hazard.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] In view of the above-mentioned defects, the purpose of the utility model is to provide a lifting arm locking structure, which can slow down the rotation speed of the connecting shaft, avoid the problem of unstable moving speed during the initial movement of the lifting arm, and improve the movement stability of the lifting arm.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a lifting arm locking structure, including: a connecting shaft, both ends of the connecting shaft are respectively rotatably connected to a fixed plate; a buffer group is arranged on the connecting shaft, the buffer group includes a buffer block fixedly connected to the connecting shaft, a rotating shaft rotatably connected to the fixed plate, a cam fixed to the rotating shaft and a friction block arranged between the buffer block and the cam, the friction block is provided with a cylinder, the cylinder is slidably connected to a support block, the support block is fixed to the fixed plate, an elastic member is arranged on the outer sleeve of the cylinder, and the cam and the buffer block are respectively abutted on both sides of the friction block.

[0007] According to the lifting arm locking structure of the utility model, a driving member is provided on the fixing plate, and a driving wheel is fixedly connected to the output end of the driving member, and the driving wheel is respectively meshed with a power wheel and a driving wheel.

[0008] According to the lifting arm locking structure of the utility model, the power wheel is sleeved outside the rotating shaft, and a one-way bearing is provided between the power wheel and the rotating shaft.

[0009] According to the lifting arm locking structure of the utility model, the driving wheel is sleeved outside the screw rod and a one-way bearing is provided between the driving wheel and the screw rod. The screw rod is rotatably connected to a fixed plate, and a movable disk is screwed onto the screw rod.

[0010] According to the lifting arm locking structure of the utility model, the movable plate is sleeved outside the connecting shaft, and the movable plate is engaged with the positioning plate.

[0011] According to the lifting arm locking structure of the utility model, the positioning plate is fixedly connected to the connecting shaft.

[0012] The utility model provides a lifting arm locking structure, including: a connecting shaft, both ends of the connecting shaft are respectively rotatably connected to a fixed plate; a buffer group is arranged on the connecting shaft, the buffer group includes a buffer block fixedly connected to the connecting shaft, a rotating shaft rotatably connected to the fixed plate, a cam fixedly connected to the rotating shaft and a friction block arranged between the buffer block and the cam, the friction block is provided with a cylinder, the cylinder is slidably connected to the support block, the support block is fixed to the fixed plate, the outer sleeve of the cylinder is provided with an elastic member, and the two sides of the friction block are respectively abutted against the cam and the buffer block; the beneficial effects of the utility model: the rotation speed of the connecting shaft can be slowed down by the buffer group, the problem of unstable moving speed during the initial movement of the lifting arm is avoided, and the moving stability of the lifting arm is improved; the rotation of the connecting shaft can be limited by the moving disk and the positioning disk, so as to ensure that the lifting arm can be stably supported and the safety of the device is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the buffer group of the utility model;

[0015] Figure 3 It is a structural schematic diagram of the buffer group of the utility model from another angle;

[0016] Figure 4 This utility model Figure 3 A schematic diagram of a top view structure;

[0017] Figure 5 It is a schematic diagram of the prior art structure of the utility model;

[0018] Figure 6 This utility model Figure 5 A is a partial enlarged schematic diagram;

[0019] In the figure, 1-fixed plate, 11-support block, 12-power wheel, 2-connecting shaft, 21-buffer block, 22-positioning plate, 3-friction block, 31-cylinder, 32-elastic member, 4-rotating shaft, 41-cam, 5-movable plate, 6-driving wheel, 61-driving member, 7-driving wheel, 71-screw, 8-one-way bearing. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] See also Figures 1 to 4 The utility model provides a lifting arm locking structure, which comprises: a connecting shaft 2, wherein both ends of the connecting shaft 2 are rotatably connected to a fixed plate 1 respectively; a buffer group arranged on the connecting shaft 2, wherein the buffer group comprises a buffer block 21 fixedly connected to the connecting shaft 2, a rotating shaft 4 rotatably connected to the fixed plate 1, a cam 41 fixedly connected to the rotating shaft 4 and a friction block 3 arranged between the buffer block 21 and the cam 41, wherein the friction block 3 is provided with a cylinder 31, wherein the cylinder 31 is slidably connected to the support block 11, wherein the support block 11 is fixedly connected to the fixed plate 1, wherein the outer sleeve of the cylinder 31 is provided with an elastic member 32, and the two sides of the friction block 3 are respectively abutted against the cam 41 and the buffer block 21; the beneficial effects of the utility model: the rotation speed of the connecting shaft 2 can be slowed down by the buffer group, the problem of unstable movement speed when the lifting arm is initially moved can be avoided, and the movement stability of the lifting arm can be improved; the rotation of the connecting shaft 2 can be limited by the moving disk 5 and the positioning disk 22, thereby ensuring that the lifting arm can be stably supported and improving the safety of the device.

[0022] See also Figures 1 to 4Preferably, a driving member 61 is provided on the fixed plate 1 of the utility model, and the output end of the driving member 61 is fixedly connected to a driving wheel 6, and the driving wheel 6 is respectively engaged with a power wheel 12 and a driving wheel 7, the power wheel 12 is sleeved outside the rotating shaft 4, and a one-way bearing 8 is provided between the power wheel 12 and the rotating shaft 4 to realize unidirectional rotation.

[0023] See also Figures 1 to 4 In addition, the driving wheel 7 of the utility model is sleeved outside the screw 71 and a one-way bearing 8 is provided between the driving wheel 7 and the screw 71. The screw 71 is rotatably connected to the fixed plate 1. The movable disk 5 is screwed on the screw 71. The driving wheel 7 drives the screw 71 to rotate, ensuring that the movable disk 5 is driven to move axially along the central axis of the connecting shaft 2.

[0024] See also Figures 1 to 4 Furthermore, the movable disk 5 of the utility model is sleeved outside the connecting shaft 2, and the movable disk 5 is engaged with the positioning disk 22, ensuring that the connecting shaft 2 does not rotate when the movable disk 5 is engaged with the positioning disk 22.

[0025] See also Figures 1 to 4 Better yet, the positioning plate 22 of the utility model is fixedly connected to the connecting shaft 2 to ensure stable support of the connecting shaft 2.

[0026] Working principle: The two lifting arms are connected by a connecting shaft 2, and the extension or contraction of the lifting arms is achieved by a hydraulic telescopic cylinder;

[0027] In the initial state, the moving plate 5 is meshed with the positioning plate 22, and the driving wheel 6 is meshed with the driving wheel 7 and the power wheel 12. At this time, the maximum diameter of the cam 41 abuts against the friction block 3, and the friction block 3 and the buffer block 21 are tightly fitted. The friction block 3 and the buffer block 21 are both provided with anti-slip strips to increase the friction force, and the elastic member 32 is forced to contract;

[0028] When the lifting arm needs to be extended or retracted, the driving member 61 is started, and the driving member 61 controls the movement of the driving wheel 6. At this time, the one-way bearing 8 between the driving wheel 7 and the screw 71 is locked, and the one-way bearing 8 between the power wheel 12 and the rotating shaft 4 is idling, driving the driving wheel 7 to rotate, and the power wheel 12 does not rotate. The driving wheel 7 drives the moving disk 5 to disengage from the positioning disk 22 through the screw 71; after disengagement, the driving member 61 controls the driving wheel 6 to reverse, driving the driving wheel not to rotate and the power wheel to rotate, and the power wheel 12 drives the cam 41 to rotate through the rotating shaft 4, and the cam 41 slowly disengages from the friction block 3, and the friction between the friction block 3 and the buffer block 21 slowly decreases, ensuring that the connecting shaft 2 can rotate slowly during the initial rotation and the rotation speed slowly increases, avoiding the problem of unstable moving speed during the initial movement of the lifting arm, and improving the movement stability of the lifting arm.

[0029] In summary, the utility model provides a lifting arm locking structure, including: a connecting shaft, wherein both ends of the connecting shaft are respectively rotatably connected to a fixed plate; a buffer group is arranged on the connecting shaft, the buffer group includes a buffer block fixedly connected to the connecting shaft, a rotating shaft rotatably connected to the fixed plate, a cam fixedly connected to the rotating shaft and a friction block arranged between the buffer block and the cam, the friction block is provided with a cylinder, the cylinder is slidably connected to the support block, the support block is fixed to the fixed plate, the outer sleeve of the cylinder is provided with an elastic member, and the two sides of the friction block are respectively abutted against the cam and the buffer block; the beneficial effects of the utility model: the rotation speed of the connecting shaft can be slowed down by the buffer group, the problem of unstable moving speed during the initial movement of the lifting arm is avoided, and the moving stability of the lifting arm is improved; the rotation of the connecting shaft can be limited by the moving disk and the positioning disk, so as to ensure that the lifting arm can be stably supported and the safety of the device is improved.

[0030] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A lifting arm locking structure, characterized in that: include: A connecting shaft, wherein both ends of the connecting shaft are rotatably connected to a fixed plate respectively; a buffer group is arranged on the connecting shaft, wherein the buffer group includes a buffer block fixedly connected to the connecting shaft, a rotating shaft rotatably connected to the fixed plate, a cam fixedly connected to the rotating shaft and a friction block arranged between the buffer block and the cam, wherein the friction block is provided with a cylinder, wherein the cylinder is slidably connected to a support block, wherein the support block is fixed to the fixed plate, wherein an elastic member is arranged on the outer sleeve of the cylinder, and the cam and the buffer block are respectively abutted on two sides of the friction block.

2. The lifting arm locking structure according to claim 1, characterized in that: The fixed plate is provided with a driving member, the output end of which is fixedly connected with a driving wheel, and the driving wheel is respectively meshed with a power wheel and a driving wheel.

3. The lifting arm locking structure according to claim 2, characterized in that: The power wheel is sleeved outside the rotating shaft, and a one-way bearing is arranged between the power wheel and the rotating shaft.

4. The lifting arm locking structure according to claim 2, characterized in that: The driving wheel is sleeved outside the screw rod and a one-way bearing is arranged between the driving wheel and the screw rod. The screw rod is rotatably connected to a fixed plate, and a movable disk is screwed on the screw rod.

5. The lifting arm locking structure according to claim 4, characterized in that: The movable disk is sleeved outside the connecting shaft, and the movable disk is engaged with the positioning disk.

6. The lifting arm locking structure according to claim 5, characterized in that: The positioning plate is fixedly connected to the connecting shaft.

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