JPS60157499A - Dust-proof mechanism of boom body for height service car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aerial work vehicle in which a plurality of booms with different diameters are slidably formed into a set of boom bodies, and an elevating body can be moved up and down by this boom body. In particular, the present invention relates to a dustproof mechanism for a boom for an aerial work vehicle that can prevent dust from entering the boom body by supplying air pressure higher than the outside pressure inside the boom body.

Assembling, repairing, and painting buildings, inspecting street lights, and replacing light bulbs are often performed at heights, and for this reason multiple booms with different diameters are inserted in order of the largest diameter to create a set of booms. Aerial work vehicles that have a boom body that moves up and down by extending and contracting the boom body are widely used. In this aerial work vehicle, each boom of the boom body slides during its operation, so if dust generated at the work site enters the inside of the boom body, it will adhere to the area around the boom.
Each time the boom body expands and contracts, each boom rubs against each other, resulting in increased wear due to dust. For this reason, if the adhesion is not removed periodically from each boom, parts such as the slider will wear out, making maintenance work cumbersome.

In view of the above-mentioned drawbacks, the present invention provides a dustproof boom body for an aerial work vehicle that is capable of sealing the boom body from the outer periphery and making the air inside the boom body higher than the outer circumference to prevent dust from entering the boom body. It provides a mechanism.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the entire example of Kino Afli, where 1 is a pedestal, wheels 2 are pivotally supported on each of the four sides of pedestal 1, and a rotating base 3 is fixed to the upper center surface of pedestal 1. It is. A car body 4 housing an engine, a hydraulic system, etc. is mounted on the swivel table 3 so as to be rotatable in the horizontal direction, and a pair of triangular shaft support pieces 5 are fixed to the upper surface of the car body 4. A lower boom 6, which has a hollow elongated pipe shape, is connected to the apex of the shaft support piece 5 with a pin 7, and the lower boom 6 is rotatably supported in the vertical direction by the pin 7. be. A hollow, elongated middle pool 8 is telescopically inserted into the lower pool 6, and a hollow upper pool 9 is telescopically inserted into the middle boom 8. .9 can be expanded and contracted in length by a hydraulic cylinder installed inside. This pool6.
A pool body 16 is formed by 8.9. At the tip of the upper boom 9 is a rectangular work platform 1 on which a worker rides.
0 are connected by a pin 11, a correction hydraulic cylinder 12 for correcting the posture is interposed between the upper boom 9 and the work platform 10, and a control box 13 is attached to the upper part of the work platform 10. be.

Additionally, a hydraulic cylinder 14 is installed between the vehicle body 4 and the lower pool 6.
is interposed therebetween, and the lower pool 6 and the hydraulic cylinder 14 are connected by a pin 15.

A compressor 17 is fixed to the side surface of the vehicle body 4, and the discharge end of the compressor 17 and the pool 6 are communicated through an air hose 18.

FIG. 2 shows the internal structure of the boom body 16 mentioned above.
The end of the pool 6 is closed by a bottom plate 19, and the end opposite the pool 90 is also closed by a top plate 20.
The inside of the boom body 16 is closed off from the outer periphery. A hydraulic cylinder 21 is housed inside the boom 9 along its length, one end of which is fixed to the boom 6, and the other end connected to the boom 9. Sliders 22 and 23 made of MC nylon are fixed to the outside of the base of the pooms 8 and 9.
The slider 22 slides on the inner surface of the boom 6, and the slider 23
slides on the inner peripheral surface of the pool 8. Furthermore, sliders 24 and 25 are fixed to the inside of the upper ends of the pools 6 and 8, and the slider 24 slides on the outer peripheral surface of the pool 8, and the slider 25 slides on the outer peripheral surface of the pool 9. Rubber skirts 26 and 27 are fixed to the tops of the pools 6 and 8, respectively, and the skirts 26 lightly touch the outside of the pools 8.
The skirt 27 is in light contact with the outside of the pool 9.

Next, the operation of this embodiment will be explained.

The engine in the vehicle body 4 is operated, and the engine drives a hydraulic pressure generating device (not shown) to supply hydraulic pressure to each part of the work vehicle, and the work vehicle can be freely operated by operating a lever or the like in the control box 13. . That is, when a worker gets on the workbench 10 and operates the control box 13, the pedestal 1 can move forward and backward in the entry direction, and the vehicle body 4
can be rotated left and right in the B direction on the swivel platform 3, the lower boom 6 can be tilted in the C direction by the hydraulic cylinder 14, and the middle and upper booms 8 and 9 can be tilted in the D direction by the hydraulic cylinder 21.
The workbench 10 can be extended and contracted in the direction E, and the workbench 10 is corrected and swung in the E direction so as to be always vertical by the correction hydraulic cylinder 12. In other words, the vehicle body 4 can move the platform 1 to a predetermined working position by rotating the wheels 2, and then move the vehicle body 4 to the rotating platform 3.
It can be rotated on top to orient the workbench 10 in the required direction. -Bt, by extending the hydraulic cylinder 14, the lower boom 6 is lifted to the required angle of inclination, and by extending the middle and upper booms 8, 9 from the lower boom 6, the workbench 10 can be placed on a wall, underside of an overpass, etc. It is possible to get close to the damaged part of the work area, and the worker on the work table 10 can attach and repair the parts.

Works such as removal can be performed. In addition, the workbench 10
is always oriented in the vertical direction, corrected by the action of the correction hydraulic cylinder 12. During this lifting and lowering work, the compressor 17 continues to operate, and the discharged compressed air is transmitted into the boom body 16 via the air hose 18, which acts to increase the air pressure inside the boom body 16 compared to the outside. This air pressure gradually leaks to the outside from between the pooms 6 and 8 and the pooms 8 and 9, but this air pressure is released from the gaps between the scars 26 and 27 and the booms 8 and 9, causing dust to flow inside the boom body 16. prevents intrusion. For this reason,
The inside of boom rest 16 is always dust-free, and boom 6.8.
No dust adheres to the sides of the sliders 22, 23,
Even if 24 and 25 contact and slide, it is possible to maintain a circular 1'f7 sliding motion.

Since the present invention is constructed as described above, dust does not enter into the boom body that slides and expands and contracts, and the boom body remains dust-free at all times, reducing wear on sliding parts and simplifying inspection and maintenance. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a sectional view showing the internal structure of the boom body. 6.8.9...Boom, 16...Boom body, 17.
...Compressor, 18...Air hose. Patent applicant Hikoma Seisakusho Co., Ltd. Representative patent attorney Akira Tsune Hibi

Claims (1)

[Claims] A set of boom bodies is formed by inserting a plurality of booms telescopically in the length direction, one end of the boom is connected to a base, the other end of the boom is connected to an elevating body, and the - set of boom bodies are extended and retracted. In an aerial work vehicle that moves an elevating body up and down by moving the lifting body up and down, one end of one boom is closed and the other end of the other boom is closed to seal the inside of one set of boom bodies. A dustproof mechanism for a boom body for a departmental work vehicle, characterized by supplying air pressure to increase the internal pressure and preventing dust from entering.