CN102259814B - Bracing structure of high-altitude work movable arm support - Google Patents

Abstract

The invention provides a support structure for a movable jib for aerial work, which includes a main frame, an outer balance bar, an inner balance bar, a sub-frame and a telescopic arm. The lower end of the outer balance bar is hinged to the main frame through a pin shaft, and the outer balance bar There is an inner balance rod inside, and one end of the telescopic arm, one end of the sub-frame and the outer end of the inner balance rod are hinged together through the boom pin, and the other end of the sub-frame is hinged with the main frame. Amplitude hydraulic cylinder, the piston rod of the luffing hydraulic cylinder is hinged with the telescopic arm, and the pin shaft used for the hinge connection between the lower end of the outer balance bar and the main frame is connected with the boom pin shaft, and the main frame, sub-frame and The jib luffing cylinders form a triangular structure. The present invention can reduce the storage height when the same working height is satisfied, and can increase the working height when meeting the same storage height, and has the characteristics of simple structure, compact and reasonable, good flexibility, convenient control and reliable performance.

Description

Supporting structure of active jib for aerial work

technical field

The invention relates to a movable boom support structure used for transporting workers and working equipment to a designated height for operation in construction machinery equipment, and belongs to the technical field of high-altitude operation machinery.

Background technique

There are many types of aerial work equipment products, each with its own characteristics. It started relatively early in foreign countries, and has formed a very large industry, and established an international organization (TC214). Domestic aerial work vehicles (platforms) basically rely on imports, and there are not many self-developed ones. At present, the boom support points of most aerial work vehicles (platforms) are fixed, so the structure is simple, but their maximum operating height and storage height are fixed, and the requirements of aerial work vehicles (platforms) are met While the working height is high, the storage height is minimized, which is convenient for storage and transportation. For the aerial work vehicle (platform) whose boom support point is fixed, since the boom support point is fixed, if you want to increase its working height, you can only increase the length of the arm, which in turn will make its storage length Increase.

Contents of the invention

The present invention aims at the deficiencies of existing aerial work vehicles (platforms), and provides a storage height that can be reduced when the same working height is satisfied, and that can increase the working height when meeting the same storage height, and can effectively increase the maximum underground extension depth at the same time. The supporting structure of the active jib for aerial work.

The active boom support structure for aerial work of the present invention is realized through the following technical solutions:

The support structure of the active jib for aerial work includes a main frame, an outer balance bar, an inner balance bar, a sub-beam and a telescopic arm. Rod, one end of the telescopic arm, one end of the sub-beam and the outer end of the inner balance bar are hinged together through the boom pin, the other end of the sub-beam is hinged with the main frame, and the luffing hydraulic cylinder is installed on the sub-beam. The piston rod of the wide hydraulic cylinder is hinged with the telescopic arm, and the pin shaft used for the hinge between the lower end of the outer balance bar and the main frame is connected with the pin shaft of the boom frame, and the main frame, sub-beam and boom luffing cylinder are connected form a triangular structure.

A sliding block that plays a guiding role is arranged between the inner balance bar and the outer balance bar.

A limit pin is arranged on the top of the inner balance bar, and when the inner balance bar and the outer balance bar are in a stowed state, the outer balance bar cannot push against the pin shaft of the jib, which acts as a protective limiter.

The present invention can reduce the storage height when the same working height is satisfied, increase the working height when meeting the same storage height, and can effectively increase the maximum underground extension depth of the aerial work movable boom support structure, which has a simple and compact structure Reasonable, good flexibility, convenient control, reliable performance, easy to use, easy to repair and maintain.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Figure 2 is a partial enlarged view of the connection between the jib connecting plate, the sub-frame and the inner balance bar.

Fig. 3 is a schematic diagram of the maximum working height state of the present invention.

Fig. 4 is a schematic diagram of the maximum underground extension state of the present invention.

Fig. 5 is a schematic diagram of the present invention in storage.

In the figure, 1. main frame, 2. pin shaft, 3. jib pin shaft oil cylinder, 4. luffing pin shaft, 5. outer balance bar, 6. limit pin, 7. inner balance bar, 8. jib frame Pin shaft, 9, boom plate, 10, subbeam, 11, telescopic arm, 12, luffing cylinder frame, 13, luffing cylinder pin, 14, luffing cylinder, 15, subbeam pin, 16, rotation Support upper plate, 17 slewing bearings.

Detailed ways

As shown in Figure 1 , the supporting structure of the movable jib for aerial work of the present invention mainly includes a main frame 1 , an outer balance bar 5 , an inner balance bar 7 , an auxiliary beam 10 and a telescopic arm 11 . The main frame 1 is welded on the slewing support plate 16. During the working process, the main frame 1 and the slewing support plate 16 rotate together with the slewing support 17 on the chassis of the aerial work vehicle (or platform). The lower end of the outer balance bar 5 is hinged with the main frame 1 through the pin shaft 2 to form a rotatable connection. The inside of the outer balance bar 5 is covered with an inner balance bar 7 to form a telescopic structure. The outer balance bar 5 and the inner balance bar 7 are hollow rods with a rectangular cross section. The sliding block of the guide function (marked at the end of the figure). When the inner balance bar 7 and the outer balance bar 5 are in the stowed state, in order to make the outer balance bar 5 not reach the jib pin 8, a limit pin 6 is set on the upper part of the inner balance bar 7 (see Figure 2), so as to Act as a protective limit. One end of the telescopic arm 11 is welded with a boom plate 9, the boom plate 9, one end of the sub-beam 10 and the upper end of the inner balance bar 7 are hinged together through the boom pin 8, and the other end of the sub-beam 10 is hinged with the main frame 1 together. A luffing hydraulic cylinder 14 is installed on the subbeam 10, and the piston rod of the luffing hydraulic cylinder 14 is hinged with the luffing cylinder frame 12 through the luffing pin 13, and the luffing cylinder frame 12 is welded with the telescopic arm 11, and the telescopic arm 11 The movement is driven by luffing hydraulic cylinder 14. A boom pin oil cylinder 3 is connected between the pin shaft 2 at the lower end of the outer balance bar 5 and the boom pin shaft 8, and the position of the boom pin shaft 8 is changed by the expansion and contraction of the boom pin shaft oil cylinder 3, so that the telescopic arm 11 The front end gains a greater working height. In this way, the main frame 1, the sub-beam 10 and the jib pin cylinder 3 (or the inner balance bar 7 and the outer balance bar 5 that are set together) form a triangular structure.

When working, it is usually not necessary to change the position of the boom pin 8, that is, the boom pin oil cylinder 3 is kept in a stored state. When it is necessary to obtain a larger working height, start the boom pin cylinder 3 to make it The piston rod is elongated, so that one side of the triangular structure formed by the main frame 1, the sub-beam 10 and the boom pin cylinder 3 (inner balance rod 7 and outer balance rod 5) begins to elongate, so that the boom pin 8 The position is raised, so as to change the horizontal height of the boom pin 8 and increase the working height of the aerial work vehicle (platform). The maximum working height is shown in Figure 3. When it is necessary to obtain the maximum underground extension, the boom pin cylinder 3 can also be extended to raise the horizontal height of the boom pin 8, thereby changing the elevation angle of the telescopic boom 11, so that a larger maximum underground depth can be obtained. The working scope of the extension and the state of the maximum underground extension are shown in Figure 4.

As shown in Figure 5, the piston rod of the jib pin cylinder 3 is retracted and placed in the storage position, so that the storage height of the entire aerial work vehicle (platform) can be reduced, which is convenient for transportation and storage.

The present invention adopts a variable-amplitude triangular structure to realize the change of the horizontal height of the boom pin shaft 8, expand the movable area of the telescopic boom 11, and effectively increase the scope of the working space. Compared with the fixed boom pin of the work vehicle (platform) with the same storage height, a larger working height and underground extension depth can be obtained, compared with the fixed boom pin of the work vehicle (platform) with the same working height Compared to obtain a smaller storage height, making the structure compact.

Claims (3)

1. An active jib support structure for aerial work, comprising a main frame, an outer balance bar, an inner balance bar, a sub-frame and a telescopic arm, characterized in that: the lower end of the outer balance bar is hinged to the main frame through a pin, and the outer balance The inside of the rod is equipped with an inner balance rod. One end of the telescopic arm, one end of the sub-frame and the outer end of the inner balance rod are hinged together through the boom pin, and the other end of the sub-frame is hinged with the main frame. There is a luffing hydraulic cylinder, the piston rod of the luffing hydraulic cylinder is hinged with the telescopic arm, the pin shaft used for the hinge connection between the lower end of the outer balance bar and the main frame and the pin shaft of the boom frame are connected with the boom pin oil cylinder, the main frame, the auxiliary The frame and the jib pin cylinder form a triangular structure. 2. The support structure of the active jib for aerial work according to claim 1, characterized in that: a sliding block that acts as a guide is provided between the inner balance bar and the outer balance bar. 3. The support structure of the active jib for aerial work according to claim 1, characterized in that: a limit pin is arranged on the upper part of the inner balance bar.

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