Crawler belt tensioning mechanism and aerial work platform

Abstract

The application discloses a kind of track tensioning technical field to a kind of track tensioning mechanism and aerial work platform, mechanism includes track and the guide wheel covered in the track, the guide wheel is connected with frame by transmission shaft, the frame includes the sliding unit of sliding connection with the transmission shaft;The transmission shaft is connected with welding block, the welding block is opened with tensioning through slot, the side of the tensioning through slot is connected with the tensioning bolt of compatible tensioning nut;The screw rod of the tensioning bolt is equipped with limiting piece, the first fixed plate connected with the car frame is equipped on the limiting piece, and the limiting piece between the first fixed plate and the head of the tensioning bolt is equipped with lock plate.The application can avoid the technical problems that the contact position of tensioning bolt and transmission shaft is prone to relative slip, misplacement and other phenomena when the working platform is running, ultimately affect the track tensioning effect.

Description

Technical Field

[0001] This invention belongs to the field of track tensioning technology, and relates to a track tensioning mechanism and an aerial work platform. Background Technology

[0002] Track loosening or even detachment of tracked work platforms after prolonged use has long been a problem plaguing the industry. Currently, commonly used tensioning mechanisms in the industry include... Figure 1 and Figure 2 As shown, the tensioning bolt is passed through a fixed plate on the frame, which has internal threads. The end of the tensioning bolt is then pressed against the drive shaft. Tightening the tensioning bolt increases the amount of unscrewing at the front end of the bolt, thereby pushing the guide wheel forward and ultimately achieving track tensioning. The tensioning mechanism commonly used in the industry is simple and lacks anti-loosening measures. The tensioning bolt is prone to loosening, affecting track tension and even causing the track to slip off. Furthermore, there are no anti-slip or limiting measures at the contact point between the tensioning bolt and the guide wheel shaft. When the work platform moves, relative slippage and misalignment are likely to occur at the contact point between the tensioning bolt and the guide wheel shaft, ultimately affecting the track tensioning effect.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a track tensioning mechanism that can solve the technical problem that the front end face of the tensioning bolt is prone to relative slippage and misalignment at the contact position with the guide wheel shaft, which ultimately affects the track tensioning effect.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution:

[0006] In a first aspect, this application provides a track tensioning mechanism, including a track and a guide wheel covered within the track. The guide wheel is connected to the vehicle frame via a drive shaft, and a sliding block that is slidably connected to the vehicle frame is connected to the inner side of the drive shaft.

[0007] A welding block is connected to the drive shaft. A tensioning groove is provided on the welding block. A matching tensioning bolt is connected to one side of the tensioning groove through a tensioning nut.

[0008] A limiting member is fitted on the screw of the tensioning bolt, and a first fixing plate connected to the vehicle frame is fitted on the limiting member. An anti-loosening plate is fitted on the limiting member between the first fixing plate and the head of the tensioning bolt.

[0009] Furthermore, a first limiting hole is provided on the first fixing plate, and a second limiting hole is provided on the anti-loosening plate. The first limiting hole is adapted to the limiting member, and the second limiting hole is adapted to the head of the tensioning bolt.

[0010] Furthermore, a second fixing plate is connected to the frame, which is in perpendicular contact with the anti-loosening plate.

[0011] Furthermore, the first fixing plate and the anti-loosening plate have the same maximum projected area.

[0012] Furthermore, the frame includes a sliding groove that engages with the sliding block.

[0013] Furthermore, the tensioning bolt has a mounting hole, and an R-type pin is engaged in the mounting hole.

[0014] Furthermore, the thread of the tensioning bolt is a trapezoidal thread.

[0015] Secondly, this application provides an aerial work platform, including the track tensioning mechanism described in any of the above claims.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0017] After the tensioning bolt is inserted through the tensioning nut into the welded block, it is tightened. The force of tightening the bolt is transmitted to the drive shaft and guide wheel through the welded block. The forward direction of the guide wheel is the same as the direction of the force of tightening the bolt, thus tensioning the track. The loosening of the tensioning bolt is then restricted by the cooperation of the frame, the first fixed plate, and the anti-loosening plate. When the tensioning bolt tends to loosen due to bumps, mechanism aging, or severe impact, the tensioning bolt is restrained by the frame, the first fixed plate, and the anti-loosening plate. When the tension bolt cannot move in the direction of loosening, the loosening force acting on the tension bolt is transmitted in the opposite direction to the nut and the welding block. Since the drive shaft and the frame are slidably connected by a sliding block, and the welding block is arranged on the drive shaft, the drive shaft is subjected to a force in the same direction as the tightening of the tension bolt, which drives the guide wheel to move, thus tensioning the track. By transmitting the force acting on the tension bolt to the sliding drive shaft, it is possible to avoid relative slippage and misalignment at the contact position between the tension bolt and the drive shaft when the work platform is moving, thereby improving the stability of track tension.

[0018] The anti-loosening plate is fixed in position by the frame, the first fixed plate, the second fixed plate, the tensioning bolt, and the R-pin installed on the tensioning bolt. It cannot move under the influence of bumps, aging of the mechanism, or severe impact. The fixation of the anti-loosening plate further ensures the fixation of the tensioning bolt, so that the force acting on the tensioning bolt can be reversed to the welding block and the tensioning nut, thereby achieving track tensioning. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a track tensioning mechanism provided in Embodiment 1 of the present invention.

[0020] Figure 2 This is a partial structural schematic diagram of a track tensioning mechanism provided in Embodiment 1 of the present invention.

[0021] Figure 3 This is a top view schematic diagram of the drive shaft portion of a track tensioning mechanism provided in Embodiment 1 of the present invention.

[0022] Figure 4 This is a schematic diagram of the fixed plate structure of a track tensioning mechanism provided in Embodiment 1 of the present invention.

[0023] Figure 5 This is a schematic diagram of the limiting part of a track tensioning mechanism provided in Embodiment 1 of the present invention.

[0024] Figure 6 This is a schematic diagram of the installation of the R-type pin of a track tensioning mechanism provided in Embodiment 1 of the present invention.

[0025] Figure 7 This is a schematic diagram of the overall structure of an existing track tensioning mechanism provided in the background art of this invention.

[0026] Figure 8 This is a partial structural schematic diagram of an existing track tensioning mechanism provided in the background art of this invention.

[0027] In the diagram: 1. Track; 2. Idler wheel; 3. Tensioning bolt; 301. Screw; 302. Limiting component; 4. Tensioning nut; 5. First fixing plate; 501. First limiting hole; 6. R-pin; 7. Anti-loosening plate; 701. Second limiting hole; 8. Second fixing plate; 9. Frame; 10. Welded block; 11. Drive shaft; 12. Sliding block; 2-1. Idler wheel; 2-2. Track; 2-3. Tensioning nut; 2-4. Tensioning bolt; 2-5. Fixing plate; 2-6. Idler wheel shaft. Implementation

[0028] For ease of understanding, the following is an explanation of some of the terms used in this application:

[0029] Aerial work platforms: Equipment used to transport personnel, tools and materials to a designated working position at a height. They consist of components such as a work platform, extension mechanism, chassis, electrical control system and hydraulic actuator system.

[0030] Tensioning mechanism: A mechanism to prevent track 1 from becoming loose. During operation, track 1 is constantly compressed and rubbed against the ground, which can cause it to loosen or even detach over time. To eliminate track 1 looseness, the tensioning mechanism can eliminate the looseness through its operation, maintaining the normal walking function of the entire machine.

[0031] Track 1: Track 1 is a flexible ring driven by the drive wheel and surrounding the drive wheel, track roller, idler wheel 2, and track support roller. The ground contact side of track 1 has reinforced anti-slip ribs (referred to as treads) to improve the strength and adhesion of track 1.

[0032] Guide wheel 2: guides the direction of track 1, reduces track 1 jumping during movement, prevents track 1 from derailing, and improves work efficiency.

[0033] Tensioning bolt 3: Rotate tensioning bolt 3 to increase the amount of unscrewing, thereby achieving tensioning of track 1. This patent uses trapezoidal bolts with inverted trapezoidal thread structure, which have advantages such as high strength, strong load-bearing capacity, convenient installation, and long service life.

[0034] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1:

[0037] like Figures 1 to 5 As shown, the present invention provides a track tensioning mechanism, including: a track 1 and a guide wheel 2 covered within the track 1. The guide wheel 2 is connected to a frame 9 via a drive shaft 11. A sliding block 12, which is slidably connected to the frame 9, is connected to the inner side of the drive shaft 11. The frame 9 includes a sliding groove that is slidably connected to the sliding block 12. The sliding groove is used for the sliding block 12 to drive the drive shaft 11 to slide, thereby driving the guide wheel 2 to slide. This is an application of existing mature technology. In this embodiment, the drive shaft 11 can be prevented from falling off during the sliding process.

[0038] A welding block 10 is connected to the drive shaft 11. A tensioning groove is provided on the welding block 10. A matching tensioning bolt 3 is connected to one side of the tensioning groove through a tensioning nut 4. In this embodiment, the tensioning nut 4 is arranged on the side of the welding block 10 close to the tensioning bolt 3, so that the force applied to the tensioning bolt 3 is transmitted in reverse to the welding block 10 and the drive shaft 11 connected to the welding block 10 through the tensioning nut 4.

[0039] A limiting member 302 is fitted onto the screw 301 of the tensioning bolt 3. A first limiting hole 501 is provided on the first fixing plate 5, and a second limiting hole 701 is provided on the anti-loosening plate 7. The first limiting hole 501 is adapted to the limiting member 302. In this embodiment, the first limiting hole 501 is a round hole, so that the first fixing plate 5 can limit the limiting member 302. An anti-loosening plate 7 is fitted onto the limiting member 302 between the first fixing plate 5 and the head of the tensioning bolt 3. The second limiting hole 701 is a regular polygonal hole, adapted to the head of the tensioning bolt 3. In this embodiment, the head of the tensioning bolt 3 is a regular polygon with the same shape as the second limiting hole 7, and the head of the tensioning bolt 3 passes through the second limiting hole 7. The tension bolt 3 has a head with a regular polygonal side length slightly smaller than the side length of the second limiting hole 7, allowing the tension bolt 3 to pass through the second limiting hole 7. When the tension bolt 3 tends to loosen, the head of the tension bolt 3 interferes with the second limiting hole 7, preventing the tension bolt 3 from rotating within the second limiting hole 7. Furthermore, a second fixing plate 8 is connected to the frame 9 and is perpendicularly in contact with the anti-loosening plate 7. The head of the tension bolt 3 has an installation hole, and an R-shaped pin 6 is engaged in the installation hole. Through the restriction of the anti-loosening plate 7 by the first fixing plate 5, the second fixing plate 8, the tension bolt 3, and the R-shaped pin 6, the anti-loosening plate 7 cannot move in any direction. The restriction of the anti-loosening plate 7 further ensures that the position of the tension bolt 3 remains fixed.

[0040] Specifically, the R-pin 6 needs to pass through the mounting hole at the front end of the tensioning bolt 3; therefore, the R-pin 6 can only be installed in a specific configuration. Figure 6 Two installation states were disclosed, and the rotation conditions of the tensioning bolt 3 were restricted again.

[0041] Preferably, the first fixing plate 5 and the anti-loosening plate 7 have the same maximum orthographic projection area, so that the first fixing plate 5 can restrict the movement of the anti-loosening plate 7 towards the first fixing plate 5 to the greatest extent. Since the maximum orthographic projection areas of the two are the same, the force area and the force-bearing area between the first fixing plate 5 and the anti-loosening plate 7 are equal, and the first fixing plate 5 and the anti-loosening plate 7 are not easily damaged due to uneven force.

[0042] The tensioning bolt 3 has a trapezoidal thread, with the inner and outer threads tightly fitted together by a tapered surface, making it less prone to loosening. Compared with a rectangular thread, it has slightly lower transmission efficiency, but better manufacturability, higher root strength, and better centering. Example 2:

[0043] This application provides an aerial work platform, including the track tensioning mechanism described in Embodiment 1, which has corresponding functional modules and beneficial effects.

[0044] Among them, the aerial work platform is a product that serves various industries for mobile aerial work, such as high-altitude operations, equipment installation, and maintenance.

[0045] The main products related to aerial work platforms include: scissor lift aerial work platforms, trailer-mounted aerial work platforms, articulated boom aerial work platforms, telescopic boom aerial work platforms, aluminum alloy aerial work platforms, telescopic cylinder aerial work platforms, and spider lift aerial work platforms. The track tensioning mechanism described in this application can be applied to the above seven categories of aerial work platforms.

[0046] Working principle: After the tensioning bolt 3 is inserted through the tensioning nut 4 into the welding block 10, the tensioning bolt 3 is tightened. The force of tightening the tensioning bolt 3 is transmitted to the drive shaft 11 and the guide wheel 2 through the welding block 10. The forward direction of the guide wheel 2 is consistent with the direction of the force of tightening the tensioning bolt 3, thus tensioning the track 1. Then, the loosening of the tensioning bolt 3 is restricted by the cooperation of the frame 9, the first fixing plate 5, and the anti-loosening plate 7. When the tensioning bolt 3 tends to move in the loosening direction due to bumps, aging of the mechanism, or severe impact, the tensioning bolt 3 is restricted by the frame 9, the first fixing plate 5, the anti-loosening plate 7, and the R-pin 6. The tensioning bolt 3 cannot move in any direction due to the positioning effect. The loosening force acting on the tensioning bolt 3 is transmitted in the opposite direction to the nut and the welding block 10. Since the drive shaft 11 and the frame 9 are slidably connected through the sliding block 12, and the welding block 10 is arranged on the drive shaft 11, the drive shaft 11 is subjected to a force in the same direction as the tightening of the tensioning bolt 3, which drives the guide wheel 2 to move, thus tensioning the track 1. By transmitting the force acting on the tensioning bolt 3 to the sliding drive shaft 11, it is possible to avoid relative slippage and misalignment at the contact position between the tensioning bolt 3 and the drive shaft 11 when the work platform is moving, thereby improving the stability of the track 1 tension.

[0047] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A track tensioning mechanism, comprising a track (1) and a guide wheel (2) enclosed within the track (1), the guide wheel (2) being connected to a frame (9) via a drive shaft (11), characterized in that, The inner side of the drive shaft (11) is connected to a sliding block (12) that is slidably connected to the frame (9); a welding block (10) is connected to the drive shaft (11), and a tensioning groove is provided on the welding block (10). One side of the tensioning groove is connected to a matching tensioning bolt (3) through a tensioning nut (4); a limiting member (302) is sleeved on the screw (301) of the tensioning bolt (3), and a first fixing plate (5) connected to the frame (9) is sleeved on the limiting member (302) between the first fixing plate (5) and the head of the tensioning bolt (3). An anti-loosening plate (7) is sleeved on the limiting member (302) between the first fixing plate (5) and the head of the tensioning bolt (3). The first fixing plate (5) is provided with a first limiting hole (501), and the anti-loosening plate (7) is provided with a second limiting hole (701). The first limiting hole (501) is adapted to the limiting member (302), and the second limiting hole (701) is adapted to the head of the tensioning bolt (3). The second limiting hole (701) is a regular polygonal hole that is adapted to the head of the tensioning bolt (3). The head of the tensioning bolt (3) is the same regular polygon as the second limiting hole (701). A second fixing plate (8) is connected to the frame (9) and is in perpendicular contact with the anti-loosening plate (7); The tensioning bolt (3) has an installation hole, and an R-type pin (6) is engaged in the installation hole.

2. The track tensioning mechanism according to claim 1, characterized in that, The first fixing plate (5) and the anti-loosening plate (7) have the same maximum projected area.

3. The track tensioning mechanism according to claim 1, characterized in that, The frame (9) includes a sliding groove that is adapted to engage with the sliding block (12).

4. The track tensioning mechanism according to claim 1, characterized in that, The tensioning bolt (3) has a trapezoidal thread.

5. An aerial work platform, characterized in that, Includes the track tensioning mechanism as described in any one of claims 1 to 4.

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