Boom telescopic system of multi-stage telescopic boom overhead working truck
By designing a system of multiple sets of extension wheels and extension wire ropes in a multi-stage telescopic boom aerial work vehicle, the problem of excessive load of wire ropes and pulleys in traditional systems is solved, and the service life and performance of the equipment are improved.
Patent Information
- Application Number
- CN202422022326.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-20
AI Technical Summary
When the boom telescopic system of existing multi-stage telescopic boom aerial work vehicle is extended and retracted, the load on the wire rope and pulley is too high, which affects the service life of the equipment. In addition, the traditional dual pulley system is difficult to stagger the pulley position when the multi-section telescopic boom is multi-section, resulting in the wire rope being set obliquely, generating radial torque, and affecting the performance of the equipment.
A multi-stage telescopic arm boom boom is designed, using multiple sets of telescopic wheels and extension wire ropes. The positions of the telescopic wheels on adjacent telescopic arms are staggered, the positions of the telescopic wheels on odd-stage telescopic arms are the same, and the positions of the telescopic wheels on even-stage telescopic arms are the same, and the positions of the telescopic wheels on even-stage telescopic arms are the same. The telescopic wire rope is parallel to the basic arm, reducing the space occupied by the arm surface and reducing the load on the wire rope and pulley.
By optimizing the position of the extension wheel and the layout of the wire rope, the load on the wire rope and pulley is reduced, the service life of the equipment is extended, and more telescopic arms are added while limiting the length of the boom, improving the performance and flexibility of the equipment.
Smart Images
Figure CN223033075U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of aerial work platforms, and particularly relates to a boom telescoping system for a multi-stage telescopic boom aerial work platform. Background Art
[0002] With the development of society, the scope of use of aerial work platforms is more extensive, and the working conditions are more complex, which puts forward higher requirements for the miniaturization of vehicles. At present, for telescopic boom aerial work platforms with a single cylinder and multi-stage telescopic mechanisms, due to the characteristics of the structural layout, they are limited to four-stage booms and below. To achieve higher working heights, the overall vehicle size is too large, far from meeting the requirements of miniaturization. The traditional boom retraction system, like the extension system, arranges steel wires or chains between any two stages of the boom, resulting in large changes in the cross-section of each stage of the boom. To ensure the strength and stiffness of the last-stage telescopic boom, the cross-section of the boom body is too large, reducing the overall vehicle performance.
[0003] The invention patent with the Chinese patent authorization announcement number CN 111762730B and the authorization announcement date of September 14, 2021 discloses a boom telescoping system for a multi-stage boom telescopic aerial work platform, including a basic boom, a first-stage telescopic boom, a second-stage telescopic boom, a third-stage telescopic boom, and a fourth-stage telescopic boom arranged vertically. A telescopic oil cylinder is fixedly arranged at the tail of the basic boom. A fourth pulley and a fifth pulley are fixedly arranged at intervals from top to bottom at the right end of the telescopic oil cylinder. A sixth pulley is fixedly arranged at the right part of the basic boom. A seventh pulley is fixedly arranged below the right side of the sixth pulley. A limiting component is fixedly arranged at the right part of the fourth-stage telescopic boom. An eighth pulley is fixedly arranged at the top of the limiting component. A recovery steel wire rope is wound around the seventh pulley, and the other end of the recovery steel wire rope sequentially passes around the fifth pulley, the sixth pulley, the fourth pulley, and the eighth pulley.
[0004] This device realizes the design of an aerial work platform with a single cylinder and five-stage booms, reduces the overall vehicle size, and improves the vehicle performance. However, in this system, the same set of steel wire rope and pulley system is used for both extension and retraction, and different from the traditional double-pulley system, a single-pulley system is used on each telescopic boom, which will greatly increase the load on the steel wire rope and pulleys and affect the service life of the equipment. In the currently common double-pulley system, in order to avoid the mutual interference between the extension steel wire ropes and pulleys on adjacent telescopic booms, the positions of the pulleys on adjacent telescopic booms are staggered by a certain distance, and the extension steel wire ropes are also arranged obliquely upward. This will cause two problems. One is that the obliquely upward arranged steel wire rope will generate a radial moment during operation, pressing on the pulley. The other is that due to the need to arrange other components between the pulleys and the limitation of the cross-sectional area of the boom body, the distance by which they can be staggered is limited. When the number of stages of the telescopic boom exceeds 5, this setting cannot be used. Summary of the Invention
[0005] The purpose of the present utility model is to overcome the shortcomings and deficiencies of the prior art, and to provide a multi-stage telescopic boom telescopic system for an aerial work vehicle with a simple structure, high utilization rate of the boom body area, and long service life.
[0006] To achieve the above object, the technical solution of the present utility model is: a multi-stage telescopic boom telescopic system for an aerial work vehicle, including a basic boom, at least three telescopic booms including a first-stage telescopic boom, and an extension system and a retraction system capable of controlling the telescopic movement of the telescopic boom. A telescopic oil cylinder is provided on the basic boom, and the oil cylinder rod of the telescopic oil cylinder is fixedly connected to the first-stage telescopic boom. The extension system includes multiple groups of extension wheels and extension steel wires. Extension wheels are respectively arranged on the left and right sides of the top surface of the telescopic boom. The extension steel wires are wound around the extension wheels, and the head and tail ends of the extension steel wires are respectively connected to the boom head of the telescopic boom where the extension wheels are located and the boom tail of the next-stage telescopic boom. It is characterized in that the positions of the extension wheels on adjacent telescopic booms are staggered from each other, the positions of the extension wheels on odd-stage telescopic booms are the same, the positions of the extension wheels on even-stage telescopic booms are the same, and the extension steel wires are parallel to the basic boom.
[0007] The number of stages of the telescopic boom is four, namely a first-stage telescopic boom, a second-stage telescopic boom, a third-stage telescopic boom, and a fourth-stage telescopic boom. The front end of the first-stage telescopic boom is sleeved inside the tail end of the basic boom, the front end of the second-stage telescopic boom is sleeved inside the tail end of the first-stage telescopic boom, the front end of the third-stage telescopic boom is sleeved inside the tail end of the second-stage telescopic boom, and the front end of the fourth-stage telescopic boom is sleeved inside the tail end of the third-stage telescopic boom.
[0008] The two extension wheels on the first-stage telescopic boom and the third-stage telescopic boom are integrally in an inverted "V" shape, and the two extension wheels on the second-stage telescopic boom are integrally in an "eight" shape.
[0009] The extension steel wires are divided into a first-stage extension steel wire, a second-stage extension steel wire, and a third-stage extension steel wire. The first-stage extension steel wire is wound around the extension wheel at the boom head of the first-stage telescopic boom, and the head and tail ends of the first-stage extension steel wire are respectively connected to the boom head of the first-stage telescopic boom and the boom tail of the second-stage telescopic boom; the second-stage extension steel wire is wound around the extension wheel at the boom head of the second-stage telescopic boom, and the head and tail ends of the second-stage extension steel wire are respectively connected to the boom head of the second-stage telescopic boom and the boom tail of the third-stage telescopic boom; the third-stage extension steel wire is wound around the extension wheel at the boom head of the third-stage telescopic boom, and the head and tail ends of the third-stage extension steel wire are respectively connected to the boom head of the third-stage telescopic boom and the boom tail of the fourth-stage telescopic boom.
[0010] Compared with the prior art, the beneficial effects of the present utility model are:
[0011] 1. The position of the extension wheel is cleverly designed in the utility model, so that the extension wheels on adjacent telescopic arms can be staggered. Since there is no need to occupy too much arm surface space, the gap between adjacent telescopic arms is greatly reduced, and more telescopic arms can be added under the condition of limited arm length; the extension wheel with unique structure allows the extension wire rope to be set parallel to the basic arm, and there is no radial force to press the extension wheel during operation, which can greatly improve the service life of the equipment.
[0012] 2. In the utility model, the extension wheels on adjacent telescopic arms are respectively arranged in an "eight" shape and a "丷" shape, and such a structural arrangement is simple enough and easier to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 (Front view).
[0014] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 (Side view).
[0015] Figure 3 This is a schematic diagram of the structure of the utility model Figure 3 (Top view).
[0016] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.
[0017] In the figure: basic arm 1, first-level telescopic arm 2, telescopic arm 3, telescopic cylinder 4, extension wheel 5, extension wire rope 6, first-level extension wire rope 61, second-level extension wire rope 62, third-level extension wire rope 63, second-level telescopic arm 7, third-level telescopic arm 8, fourth-level telescopic arm 9. DETAILED DESCRIPTION
[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0019] See also Figures 1-4 A multi-stage telescopic arm aerial work vehicle arm telescopic system comprises a basic arm 1, a telescopic arm 3 including a first-stage telescopic arm 2, a second-stage telescopic arm 7, a third-stage telescopic arm 8 and a fourth-stage telescopic arm 9, and an extension system and a retraction system capable of controlling the extension and retraction of the telescopic arm 3. The front end of the first-stage telescopic arm 2 is sleeved in the tail end of the basic arm 1, the front end of the second-stage telescopic arm 7 is sleeved in the tail end of the first-stage telescopic arm 2, the front end of the third-stage telescopic arm 8 is sleeved in the tail end of the second-stage telescopic arm 7, and the front end of the fourth-stage telescopic arm 9 is sleeved in the tail end of the third-stage telescopic arm 8.
[0020] A telescopic oil cylinder 4 is provided on the basic arm 1. The oil cylinder rod of the telescopic oil cylinder 4 is fixedly connected to the first-stage telescopic arm 2. The telescopic system includes multiple groups of telescopic wheels 5 and telescopic steel wires 6. Telescopic wheels 5 are respectively arranged on the left and right sides of the top surface of the telescopic arm 3. The telescopic steel wire 6 is wound around the telescopic wheels 5. The telescopic steel wire 6 is divided into a first-stage telescopic steel wire 61, a second-stage telescopic steel wire 62, and a third-stage telescopic steel wire 63. The first-stage telescopic steel wire 61 is wound around the telescopic wheel 5 at the arm head of the first-stage telescopic arm 2. The head and tail ends of the first-stage telescopic steel wire 61 are respectively connected to the arm head of the first-stage telescopic arm 2 and the arm tail of the second-stage telescopic arm 7; the second-stage telescopic steel wire 62 is wound around the telescopic wheel 5 at the arm head of the second-stage telescopic arm 7. The head and tail ends of the second-stage telescopic steel wire 62 are respectively connected to the arm head of the second-stage telescopic arm 7 and the arm tail of the third-stage telescopic arm 8; the third-stage telescopic steel wire 63 is wound around the telescopic wheel 5 at the arm head of the third-stage telescopic arm 8. The head and tail ends of the third-stage telescopic steel wire 63 are respectively connected to the arm head of the third-stage telescopic arm 8 and the arm tail of the fourth-stage telescopic arm 9.
[0021] The positions of the telescopic wheels 5 on adjacent telescopic arms 3 are staggered from each other. The two telescopic wheels 5 on the first-stage telescopic arm 2 and the third-stage telescopic arm 8 are integrally in an inverted V shape, and the two telescopic wheels 5 on the second-stage telescopic arm 7 are integrally in an eight shape. The first-stage telescopic steel wire 61, the second-stage telescopic steel wire 62, and the third-stage telescopic steel wire 63 are parallel to the basic arm 1.
[0022] The structure and connection relationship of the retraction system are the same as those of the extension system. The difference is that the retraction wheels in the retraction system are located inside the basic arm 1.
[0023] When the aerial work vehicle needs to perform aerial work, the oil cylinder rod of the telescopic oil cylinder 4 extends, and the first-stage telescopic arm 2 extends together with the oil cylinder rod. Since the head and tail ends of the first-stage telescopic steel wire 61 are respectively connected to the arm head of the first-stage telescopic arm 2 and the arm tail of the second-stage telescopic arm 7, the extension of the first-stage telescopic arm 2 will drive the extension of the second-stage telescopic arm 7; similarly, the extension of the second-stage telescopic arm 7 will drive the extension of the third-stage telescopic arm 8, and the extension of the third-stage telescopic arm 8 will drive the extension of the fourth-stage telescopic arm 9. Even if there are more stages of telescopic arms 3, they will extend in this process.
[0024] When the aerial work vehicle finishes working, only need to retract the oil cylinder rod of the telescopic oil cylinder 4, and each stage of telescopic arm 3 will retract in turn under the action of the retraction system.
[0025] Although there are only four-stage telescopic arms in the drawings of the present utility model, it does not mean that there can be at most four-stage telescopic arms. The unique design of the telescopic wheels 5 on the telescopic arm 3 enables it to be increased to five-stage telescopic arms, six-stage telescopic arms or even more in case of need.
Claims
1. A telescopic system for a boom of an aerial work vehicle with a multi-stage telescopic arm, comprising a basic arm (1), at least three-stage telescopic arms (3) including a first-stage telescopic arm (2), and an extension system and a retraction system capable of controlling the extension and retraction of the telescopic arms (3), wherein the basic arm (1) is provided with a telescopic oil cylinder (4), the oil cylinder rod of the telescopic oil cylinder (4) is fixedly connected to the first-stage telescopic arm (2), the extension system comprises a plurality of sets of extension wheels (5) and extension wire ropes (6), the left and right sides of the top surface of the telescopic arm (3) are respectively provided with extension wheels (5), the extension wire ropes (6) are wound around the extension wheels (5), the head and tail ends of the extension wire ropes (6) are respectively connected to the arm head of the telescopic arm (3) where the extension wheel (5) is located and the arm tail of the next-stage telescopic arm (3), characterized in that: The positions of the extension wheels (5) on adjacent telescopic arms (3) are staggered from each other. The positions of the extension wheels (5) on the odd-level telescopic arms (3) are the same, and the positions of the extension wheels (5) on the even-level telescopic arms (3) are the same. The extension wire rope (6) is parallel to the basic arm (1).
2. The multi-stage telescopic boom aerial work vehicle boom extension and retraction system according to claim 1, characterized in that: The telescopic arm (3) has four levels, namely the first-level telescopic arm (2), the second-level telescopic arm (7), the third-level telescopic arm (8), and the fourth-level telescopic arm (9). The front end of the first-level telescopic arm (2) is sleeved inside the tail end of the basic arm (1). The front end of the second-level telescopic arm (7) is sleeved inside the tail end of the first-level telescopic arm (2). The front end of the third-level telescopic arm (8) is sleeved inside the tail end of the second-level telescopic arm (7). The front end of the fourth-level telescopic arm (9) is sleeved inside the tail end of the third-level telescopic arm (8).
3. The multi-stage telescopic boom aerial work vehicle boom telescopic system according to claim 2, characterized in that: The two extension wheels (5) on the first-level telescopic arm (2) and the third-level telescopic arm (8) as a whole are in the shape of "丷", and the two extension wheels (5) on the second-level telescopic arm (7) as a whole are in the shape of "八".
4. The multi-stage telescopic boom aerial work vehicle boom extension and retraction system according to claim 2, characterized in that: The extension wire rope (6) is divided into the first-level extension wire rope (61), the second-level extension wire rope (62), and the third-level extension wire rope (63). The first-level extension wire rope (61) is wound around the extension wheel (5) at the head of the first-level telescopic arm (2), and the head and tail ends of the first-level extension wire rope (61) are respectively connected to the head of the first-level telescopic arm (2) and the tail of the second-level telescopic arm (7). The second-level extension wire rope (62) is wound around the extension wheel (5) at the head of the second-level telescopic arm (7), and the head and tail ends of the second-level extension wire rope (62) are respectively connected to the head of the second-level telescopic arm (7) and the tail of the third-level telescopic arm (8). The third-level extension wire rope (63) is wound around the extension wheel (5) at the head of the third-level telescopic arm (8), and the head and tail ends of the third-level extension wire rope (63) are respectively connected to the head of the third-level telescopic arm (8) and the tail of the fourth-level telescopic arm (9).