JPH0812282A - Industrial vehicle with boom - Google Patents

Abstract

PURPOSE:To immediately recognize the achievement of a buffer member of a boom such as a pad to the abrasion limit. CONSTITUTION:This industrial vehicle is provided with telescopic booms 11-13. Buffer members 20, 21 and vibrating members 30, 31 are fitted onto the peripheral surface of base ends 121, 131 of interior booms 12, 13 close to each other. In the case where the buffer members 20, 21 are worn at the predetermined value or more, the vibrating members 30, 31 abut on the inner walls 112, 122 of exterior booms 11, 12, and generates the sliding sound with the telescopic operation of the interior booms 12, 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial vehicle equipped with a telescopic boom, and more particularly, to an industrial vehicle with a boom capable of knowing the wear limit of a cushioning member provided between interior and exterior booms.

[0002]

2. Description of the Related Art There are industrial vehicles such as aerial work vehicles and crane trucks having a telescopic boom. For example, an aerial work vehicle 90 having a three-stage boom has a middle beam 912 that is inscribed inside the base boom 911 and expands and contracts inside the middle beam 912, as shown in FIG. And a fly beam 913.

A workbench 92 is attached to the end of the fly beam 913. And, as shown in FIG. 5, metal booms 911 to 913 located inside and outside
The inner boom 912 so that the
Buffer pads 921 and 922 are attached on the outer peripheral surface of the base end side of (or 913) and on the inner wall surface of the exterior boom 911 (or 912) on the upper end side (not shown).

As shown in FIG. 6, a nut 925 is embedded in the bottom of the pads 921, 922 at the base end of the interior boom 912 (913), and the outer periphery of the interior boom 912 (or 913) is fixed by a bolt 926. Fixed to the surface. And since the pads 921 and 921 at the base end are always covered with the exterior boom 911 (912),
It is extremely difficult to see from the outside.

Then, as shown in FIG.
The inner boom 912 (913) expands and contracts in the direction of the arrow while abutting and sliding 1,922 on the inside of the outer boom 911 (912). The pad on the upper surface of the base end of the interior boom is subjected to a particularly large load, and wear is severe.

[0006]

[Problems to be Solved] However, the conventional industrial vehicle with a boom has the following problems. That is, it is extremely difficult to detect the worn state of the pads 921 and 922 on the base end side of the interior boom 912 (913) that is easily worn. That is, the pads 921 and 922 are the outer boom 9
Since it is covered with 11 (912), it is extremely difficult to visually recognize it from the outside.

When the pads 921 and 922 are worn out beyond the usable limit, the nuts 925 and the bolts 926 that fix the pads 921 and 922 are exposed, and the exterior boom 911 (912) is damaged unknowingly. appear. In view of the above conventional problems, the present invention is to provide an industrial vehicle with a boom that can recognize early that the cushioning member of the interior boom such as a pad has reached the limit of wear.

[0008]

The present invention is an industrial vehicle equipped with a telescopic boom, the industrial vehicle including an exterior boom, and an interior boom that slides inside the exterior boom and extends and contracts with respect to the exterior boom. A cushioning member for cushioning the impact shock to the exterior boom and a vibrating member arranged close to the cushioning member are mounted on the outer peripheral surface of the interior boom on the base end side. The vibrating member is configured to come into contact with the inner wall of the exterior boom and generate a sliding sound as the interior boom expands and contracts when the cushioning member wears out by a predetermined value or more. Located on an industrial vehicle with a boom.

What is most noticeable in the present invention is that the vibrating member is mounted in the vicinity of the shock absorbing member, and the vibrating member is worn when the shock absorbing member is worn over a predetermined value, that is, the wear limit. In addition, it is configured to come into contact with the inner wall of the exterior boom and generate a sliding sound as the interior boom expands and contracts.

It is preferable that the vibrating member is made of a material that easily produces a sliding noise and is hard to damage the inner wall of the exterior boom. The vibrating member can be formed of, for example, a thin metal plate that comes into contact with the inner wall of the exterior boom when the buffer member rubs over a predetermined value. If the metal plate comes into contact with the inner wall of the exterior boom, as the interior boom expands and contracts,
This is because a sliding sound with a frequency that is easy to hear is emitted.

Further, it is preferable that a corrugated concave and convex portion is provided on a contact portion of the metal plate with the exterior boom. This is because by providing such an uneven portion, it is possible to easily generate a sliding sound and to set the frequency of the sliding sound to an appropriate value that is easy to detect.

Further, the vibrating member resonates with the sliding sound,
For example, it is preferable to provide a resonance structure such as a resonance box. By resonating the sliding sound, the intensity of the sound can be increased and the sliding sound can be more easily sensed.

[0013]

In the interior boom of the industrial vehicle according to the present invention, the vibrating member is attached in the vicinity of the buffer member at the base end. Then, when the cushioning member wears out beyond a predetermined value, that is, above the so-called wear limit, the vibration member comes into contact with the inner wall of the exterior boom.

As a result, as the inner boom expands and contracts, the vibrating member comes into contact with the inner wall of the outer boom and slides to generate a sliding sound. Then, by detecting the sliding sound, the fact that the cushioning member at the base end has reached the limit wear,
Can be recognized immediately. Since the cushioning member at the base end rubs the earliest, the other cushioning members have not reached the limit wear before that, and the exterior boom is not damaged by the wear of the cushioning member. As described above, according to the present invention, it is possible to provide an industrial vehicle with a boom that can quickly recognize that the cushioning member of the interior boom has reached the limit of wear.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An industrial vehicle according to an embodiment of the present invention will be described with reference to FIGS. This example is an industrial vehicle 1 equipped with telescopic booms 11 to 13, as shown in FIG. 3, and includes an exterior boom 11, a first interior boom 12 that extends and contracts by sliding inside the exterior boom 11, and 1 interior boom 12
A second interior boom 13 that slides and expands and contracts inside. In FIG. 3, reference numeral 41 is a workbench.

Then, as shown in FIG. 1, the interior boom 1
The outer peripheral surfaces of the base end portions 121 and 131 (FIG. 3) of the second and the third buffer members 20 and 21 that reduce the impact of the contact with the outer boom 11 (12) and the buffer members 20 and 21 are close to each other. The arranged vibrating members 30 and 31 are attached.

As shown in FIG. 2, the vibrating member 30 (31) has an inner wall 112 (122) of the outer boom 11 (12) when the shock absorbing member 20 (21) is worn out by a predetermined value a or more.
It is configured to make a sliding sound as the inner boom 12 (13) expands and contracts.

As shown in FIG. 2, the cushioning member 20 (21) has a resin pad 23, a nut 24 embedded in the bottom of the pad 23, and a bolt 25 screwed into the nut 24. The vibrating member 30 (31) is a substantially L-shaped metal plate made of spring steel, and the bottom 32 thereof is the pad 23.
And the interior boom 12 (13) are sandwiched and fixed.

The vibrating member 30 (31) has a protruding piece 33 standing upright at a right angle to the outer peripheral surface of the interior boom 12 (13), and the tip 331 of the protruding piece 33 has a pad 23. Is located below the end face 231 by a predetermined value a (the limit wear amount of the pad 23).

Next, the function and effect of the industrial vehicle of this example will be described. In the industrial vehicle of this example, as shown in FIG.
When the pad 23 of the cushioning member 20, 21 is worn by a predetermined value a (limit wear amount), the protrusion 33 of the vibrating member 30 (31).
331 has the same height as the end surface 231 of the pad 23.

As a result, the tip 331 of the protrusion 33 comes into contact with the inner wall 112 (122) of the outer boom 11 (12), and a sliding noise is generated as the boom 12 (13) expands and contracts. become. Then, the driver can know that the pad 23 has reached the limit wear by the sliding sound.

In general, since the pads 23 of the base end portions 121 and 131 reach the limit wear first, it is possible to know the replacement time of the cushion member without delay, and the exterior boom 11 (12).
Can prevent damage. As described above, according to this example, it is possible to provide the industrial vehicle with the boom that can recognize that the cushioning member has reached the limit of wear at an early stage.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a boom base end portion of an industrial vehicle according to an embodiment.

FIG. 2 is an enlarged view of the mounting portion of the cushioning member of the embodiment (A in FIG. 1).
(Enlarged view of the arrow).

FIG. 3 is an outline view of an industrial vehicle with a boom according to an embodiment.

FIG. 4 is an external view of a conventional industrial vehicle with a boom.

FIG. 5 is an enlarged sectional view of a boom base end portion of a conventional industrial vehicle.

6 is an enlarged view of an arrow B portion of FIG.

[Explanation of symbols]

 11-13 ... Boom, 121, 131 ... Base end part, 112, 122 ... Inner wall, 20, 21 ... Buffer member, 30, 31 ... Vibration member,

Claims (3)

[Claims] 1. An industrial vehicle equipped with a telescopic boom, the industrial vehicle having an exterior boom, and an interior boom that slides inside the exterior boom and extends and contracts with respect to the exterior boom. , On the outer peripheral surface of the interior boom on the base end side,
A cushioning member that alleviates the impact of abutting against the exterior boom and a vibrating member that is arranged close to the cushioning member are attached. The vibrating member is mounted on the exterior body when the cushioning member is abraded by a predetermined value or more. An industrial vehicle with a boom configured to come into contact with an inner wall of the boom and generate a sliding sound as the interior boom expands and contracts. 2. The industrial vehicle with a boom according to claim 1, wherein the vibrating member has a resonance structure that resonates with a contact sound with the exterior boom. 3. The vibrating member according to claim 1, wherein the vibrating member has a metal plate projecting piece that is erected in a direction perpendicular to the outer peripheral surface of the interior boom, and the corrugated shape is provided at the tip of the projecting piece. An industrial vehicle with a boom, characterized in that the uneven portions of the are formed.