Boom telescopic system of multi-stage telescopic boom overhead working truck

Abstract

The utility model relates to a boom frame telescopic system of a multi-stage telescopic boom overhead working truck, which comprises a basic boom, at least three stages of telescopic booms including a first-stage telescopic boom, as well as an extension range system and a contraction range system which can control the telescopic booms to stretch out and draw back, a telescopic oil cylinder is arranged on the basic boom, and an oil cylinder rod of the telescopic oil cylinder is fixedly connected with the first-stage telescopic boom; the telescopic boom is characterized in that a range shrinking system is mounted in the telescopic boom and comprises a plurality of sets of range shrinking wheels and range shrinking steel wire ropes, the range shrinking wheels are arranged on the left side and the right side of the inner bottom wall of the telescopic boom respectively, and the range shrinking steel wire ropes are wound on the range shrinking wheels; the head end and the tail end of the range-shrinking steel wire rope are connected with the arm head of the telescopic arm where the range-shrinking wheel is located and the arm tail of the next-stage telescopic arm respectively, and the range-shrinking steel wire rope is parallel to the basic arm. The utility model has the advantages of simple structure, high utilization rate of arm body area, convenience in installation and maintenance and long service life.

Description

Technical Field

[0001] This utility model belongs to the field of aerial work platforms, specifically relating to a boom telescopic system for a multi-stage telescopic boom aerial work platform. Background Technology

[0002] With societal development, aerial work platforms are being used more extensively, and operating conditions are becoming more complex, placing higher demands on vehicle miniaturization. Currently, telescopic boom aerial work platforms using single-cylinder, multi-stage telescopic mechanisms are limited to four boom stages or lower due to their structural layout. To achieve higher working heights, this results in excessively large overall vehicle dimensions, far from meeting the requirements for miniaturization. Traditional boom retraction systems, like extension systems, involve arranging wire ropes or chains between any two boom stages, leading to significant variations in the boom cross-section at each stage. To ensure the strength and rigidity of the final telescopic boom stage, the boom body cross-section becomes excessively large, reducing overall vehicle performance.

[0003] Chinese Patent Publication No. CN 111762730B, with a publication date of September 14, 2021, discloses a multi-stage telescopic boom system for aerial work platforms. The system includes a vertically arranged basic boom, a first-stage telescopic boom, a second-stage telescopic boom, a third-stage telescopic boom, and a fourth-stage telescopic boom. A telescopic cylinder is fixedly mounted at the tail of the basic boom. A fourth and fifth pulley are fixedly mounted at intervals from top to bottom on the right end of the telescopic cylinder. A sixth pulley is fixedly mounted on the right side of the basic boom. A seventh pulley is fixedly mounted below and to the right of the sixth pulley. A limit assembly is fixedly mounted on the right side of the fourth-stage telescopic boom. An eighth pulley is fixedly mounted on the top of the limit assembly. A recovery wire rope is wound around the seventh pulley, and the other end of the recovery wire rope sequentially passes over the fifth, sixth, fourth, and eighth pulleys.

[0004] This device features a single-cylinder, five-section boom aerial work platform design, reducing overall vehicle size and improving performance. However, unlike traditional double-pulley systems, this system uses a single-pulley system for both extension and retraction. This significantly increases the load on the wire ropes and pulleys, impacting the equipment's lifespan. In contrast, current double-pulley systems have both the extension and retraction ropes mounted on the boom frame. Due to the limited area of ​​the boom frame, designers must invest considerable effort in space planning. Even then, interference between the extension and retraction ropes cannot be completely avoided, making installation inconvenient. Furthermore, maintenance is difficult if any component fails. 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 area, convenient installation and maintenance, and long service life.

[0006] To achieve the above objectives, 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 sets of telescopic booms including a first-stage telescopic boom, and an extension stroke system and a retraction stroke 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 feature is that a retraction stroke system is installed inside the telescopic boom. The retraction stroke system includes multiple sets of retraction pulleys and retraction steel wires. Retraction pulleys are respectively arranged on the left and right sides of the inner bottom wall of the telescopic boom. The retraction steel wire is wound around the retraction pulley, and the head and tail ends of the retraction steel wire are respectively connected to the boom head of the telescopic boom where the retraction pulley is located and the boom tail of the next-stage telescopic boom. The retraction steel wire is parallel to the basic boom.

[0007] An extension stroke system is installed on the telescopic boom. The extension stroke system includes multiple sets of extension pulleys and extension steel wires. Extension pulleys are respectively arranged on the left and right sides of the top surface of the telescopic boom. The extension steel wire is wound around the extension pulley, and the head and tail ends of the extension steel wire are respectively connected to the boom head of the telescopic boom where the extension pulley is located and the boom tail of the next-stage telescopic boom.

[0008] The telescopic boom has three levels, namely the first-stage telescopic boom, the second-stage telescopic boom, the third-stage telescopic boom and the fourth-stage telescopic 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. The front end of the fourth-stage telescopic boom is sleeved inside the tail end of the third-stage telescopic boom.

[0009] The retraction steel wire is divided into a first-stage retraction steel wire, a second-stage retraction steel wire and a third-stage retraction steel wire. The first-stage retraction steel wire is wound around the retraction pulley inside the boom head of the first-stage telescopic boom, and the head and tail ends of the first-stage retraction 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 retraction steel wire is wound around the retraction pulley inside the boom head of the second-stage telescopic boom, and the head and tail ends of the second-stage retraction 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 retraction steel wire is wound around the retraction pulley inside the boom head of the third-stage telescopic boom, and the head and tail ends of the third-stage retraction 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] The two extension pulleys on the first-stage telescopic boom and the third-stage telescopic boom are integrally in the shape of "丷", and the two extension pulleys on the second-stage telescopic boom are integrally in the shape of "八".

[0011] This invention conceals the extension system within the telescopic boom, freeing up a significant amount of space on the boom surface without affecting its basic functions. This design provides workers with ample operating space when installing the extension system on the boom surface, making installation and maintenance very convenient. Furthermore, the extension system, located inside the telescopic boom, is protected by the boom, greatly reducing the risk of damage and significantly extending its overall service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 (Main view).

[0013] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 (Side view).

[0014] Figure 3 This is a schematic diagram of the structure of this utility model. Figure 3 (Top view).

[0015] In the diagram: 1. Basic boom; 2. First-stage telescopic boom; 3. Telescopic boom; 4. Telescopic cylinder; 5. Retraction wheel; 6. Retraction wire rope; 7. Extension wheel; 8. Extension wire rope; 61. First-stage retraction wire rope; 62. Second-stage retraction wire rope; 63. Third-stage retraction wire rope; 9. Second-stage telescopic boom; 10. Third-stage telescopic boom; 11. Fourth-stage telescopic boom. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] See Figures 1-3 A multi-stage telescopic boom aerial work platform boom telescopic system includes a basic boom 1, a telescopic boom 3 comprising a primary telescopic boom 2, a secondary telescopic boom 9, a tertiary telescopic boom 10, and a quaternary telescopic boom 11, and an extension system and a retraction system for controlling the extension and retraction of the telescopic boom 3. The front end of the primary telescopic boom 2 is fitted inside the rear end of the basic boom 1, the front end of the secondary telescopic boom 9 is fitted inside the rear end of the primary telescopic boom 2, the front end of the tertiary telescopic boom 10 is fitted inside the rear end of the secondary telescopic boom 9, and the front end of the quaternary telescopic boom 11 is fitted inside the rear end of the tertiary telescopic boom 10. Retraction wheels 5 are respectively installed on the left and right sides inside the telescopic boom 3, and the retraction wheels 5 are mounted on the inner bottom wall of the telescopic boom 3. This arrangement allows the retraction wire rope 6 to be pulled back more effortlessly.

[0018] 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 7 and telescopic steel wire ropes 8. Telescopic wheels 7 are respectively provided on the left and right sides of the top surface of the telescopic arm 3. The telescopic steel wire rope 8 is wound around the telescopic wheels 7, and the head and tail ends of the telescopic steel wire rope 8 are respectively connected to the arm head of the telescopic arm 3 where the telescopic wheel 7 is located and the arm tail of the next-stage telescopic arm 3.

[0019] The retraction steel wire rope 6 is divided into a first-stage retraction steel wire rope 61, a second-stage retraction steel wire rope 62, and a third-stage retraction steel wire rope 63. The first-stage retraction steel wire rope 61 is wound around the retraction wheel 5 inside the arm head of the first-stage telescopic arm 2. The head and tail ends of the first-stage retraction steel wire rope 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 9. The second-stage retraction steel wire rope 62 is wound around the retraction wheel 5 inside the arm head of the second-stage telescopic arm 9. The head and tail ends of the second-stage retraction steel wire rope 62 are respectively connected to the arm head of the second-stage telescopic arm 9 and the arm tail of the third-stage telescopic arm 10. The third-stage retraction steel wire rope 63 is wound around the retraction wheel 5 inside the arm head of the third-stage telescopic arm 10. The head and tail ends of the third-stage retraction steel wire rope 63 are respectively connected to the arm head of the third-stage telescopic arm 10 and the arm tail of the fourth-stage telescopic arm 11.

[0020] The two telescopic wheels 7 on the first-stage telescopic arm 2 and the third-stage telescopic arm 10 are integrally in the shape of "丷", and the two telescopic wheels 7 on the second-stage telescopic arm 9 are integrally in the shape of "八".

[0021] When the aerial work platform needs to perform aerial work, the oil cylinder rod of the telescopic oil cylinder 4 extends, and each stage of the telescopic arm 3 will extend in turn under the action of the telescopic system.

[0022] When the aerial work platform finishes working, the oil cylinder rod of the telescopic oil cylinder 4 retracts, and the first-stage telescopic arm 2 extends together with the oil cylinder rod. Since the head and tail ends of the first-stage retraction steel wire rope 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 9, the retraction of the first-stage telescopic arm 2 will drive the retraction of the second-stage telescopic arm 9. Similarly, the retraction of the second-stage telescopic arm 9 will drive the retraction of the third-stage telescopic arm 10, and the retraction of the third-stage telescopic arm 10 will drive the retraction of the fourth-stage telescopic arm 11. Even if there are more stages of the telescopic arm 3, it will retract in this process.

Claims

1. A multi-stage telescopic boom aerial work platform boom telescopic system, comprising a basic boom (1), at least three stages of telescopic booms (3) including a first-stage telescopic boom (2), and an extension system and a retraction system capable of controlling the extension and retraction of the telescopic booms (3), wherein a telescopic cylinder (4) is provided on the basic boom (1), and the cylinder rod of the telescopic cylinder (4) is fixedly connected to the first-stage telescopic boom (2), characterized in that: A retraction system is installed inside the telescopic arm (3). The retraction system includes multiple groups of retraction wheels (5) and retraction steel wires (6). Retraction wheels (5) are respectively arranged on the left and right sides of the inner bottom wall of the telescopic arm (3). The retraction steel wire (6) is wound around the retraction wheels (5). The head and tail ends of the retraction steel wire (6) are respectively connected to the head of the telescopic arm (3) where the retraction wheel (5) is located and the tail of the next-level telescopic arm (3). The retraction steel wire (6) is parallel to the basic arm (1).

2. The boom telescopic system for a multi-stage telescopic boom aerial work platform according to claim 1, characterized in that: An extension system is installed on the telescopic arm (3). The extension system includes multiple groups of extension wheels (7) and extension steel wires (8). Extension wheels (7) are respectively arranged on the left and right sides of the top surface of the telescopic arm (3). The extension steel wire (8) is wound around the extension wheels (7). The head and tail ends of the extension steel wire (8) are respectively connected to the head of the telescopic arm (3) where the extension wheel (7) is located and the tail of the next-level telescopic arm (3).

3. The boom telescopic system for a multi-stage telescopic boom aerial work platform according to claim 1, characterized in that: The telescopic arm (3) has three levels, namely the first-level telescopic arm (2), the second-level telescopic arm (9), the third-level telescopic arm (10), and the fourth-level telescopic arm (11). The front end of the second-level telescopic arm (9) is sleeved inside the tail end of the first-level telescopic arm (2). The front end of the third-level telescopic arm (10) is sleeved inside the tail end of the second-level telescopic arm (9). The front end of the fourth-level telescopic arm (11) is sleeved inside the tail end of the third-level telescopic arm (10).

4. The boom telescopic system for a multi-stage telescopic boom aerial work platform according to claim 3, characterized in that: The retraction steel wire (6) is divided into the first-level retraction steel wire (61), the second-level retraction steel wire (62), and the third-level retraction steel wire (63). The first-level retraction steel wire (61) is wound around the retraction wheel (5) inside the head of the first-level telescopic arm (2). The head and tail ends of the first-level retraction steel wire (61) are respectively connected to the head of the first-level telescopic arm (2) and the tail of the second-level telescopic arm (9). The second-level retraction steel wire (62) is wound around the retraction wheel (5) inside the head of the second-level telescopic arm (9). The head and tail ends of the second-level retraction steel wire (62) are respectively connected to the head of the second-level telescopic arm (9) and the tail of the third-level telescopic arm (10). The third-level retraction steel wire (63) is wound around the retraction wheel (5) inside the head of the third-level telescopic arm (10). The head and tail ends of the third-level retraction steel wire (63) are respectively connected to the head of the third-level telescopic arm (10) and the tail of the fourth-level telescopic arm (11).

5. The boom telescopic system for a multi-stage telescopic boom aerial work platform according to claim 3, characterized in that: The two extension wheels (7) on the first-level telescopic arm (2) and the third-level telescopic arm (10) are in an overall "丷" shape, and the two extension wheels (7) on the second-level telescopic arm (9) are in an overall "八" shape.

Images