JP3359869B2 - Structure of swivel frame of work platform - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revolving unit installed on a running body via a revolving device, a telescopic boom is mounted on the revolving unit so as to be able to move up and down, and a work table is mounted on a tip of the telescopic boom. More particularly, the present invention relates to a structure of a revolving frame for routing hydraulic hoses and cables (hereinafter sometimes referred to as hoses).

[0002]

2. Description of the Related Art A conventional aerial work vehicle is provided with a hydraulic hose and a cable along with a telescopic boom. These hydraulic hoses and cables are used to supply hydraulic oil to a hydraulic cylinder for holding the workbench horizontally and a hydraulic motor for turning the workbench. Pilot hydraulic hoses and cables for telescopic, undulating, starting the engine and other remote operations. Conventionally, such hydraulic hoses and cables are connected to a control valve, a pilot valve, or a control panel mounted on the front or side of the turning frame from a root portion of the telescopic boom through a counterweight mounted on a rear portion of the turning frame. Connected to As another structure, there is a structure in which the hydraulic hose and the cable are connected to the control valve, the pilot valve, the control panel, or the like through the inside of the bracket from the side opening of the bracket for pinning the telescopic boom.

[0003]

SUMMARY OF THE INVENTION Among the conventional structures,
In a structure in which hoses are routed from the base end of the telescopic boom via the counterweight behind, when the telescopic boom is raised, the part that has slackened backward from the base end of the telescopic boom is bent by the standing of the telescopic boom. As a result, the revolving structure projects rearward from the turning radius of the revolving structure, which hinders the revolving operation.

[0004] On the other hand, in a structure in which hoses are passed through the bracket from the side, the hydraulic hose and the cable are twisted with the ups and downs of the telescopic boom, and these may be damaged.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention does not require a hose such as a hydraulic hose and a cable drawn around the telescopic boom to receive a force such as a twist or the like when the telescopic boom is raised and lowered, and furthermore, to maintain the hose. It is an object of the present invention to provide a structure of a turning frame of an aerial work vehicle, the appearance of which is improved by the provided structure.

[0006]

According to a first aspect of the present invention, there is provided a swivel frame structure for an aerial work vehicle, wherein a swivel body is installed on a traveling body via a swivel device, and a telescopic boom can be freely raised and lowered on the swivel body. And a work platform attached to the tip of the telescopic boom, wherein a bracket for mounting the telescopic boom is constituted by left and right standing plates provided on a base portion of the revolving body. Then, attach the base end of the telescopic boom to the top of the standing plate.
And reinforcing plates fixed to the front and rear of the left and right standing boards.
Only the upper portion of the rear part of the reinforcing plate, opening into the lower portion of the front portion of the reinforcement plate
Parts for supporting hoses between the left and right standing plates.
Providing an id plate, hoses attached to the telescopic boom,
The rear end of the telescopic boom through a curved portion
Between the standing plate from the opening at the top of the reinforcing plate of the part,
Opening at the bottom of the front reinforcing plate supported by the guide plate
By pulling out more,
So that the hoses can enter and exit between the standing plates.
It is characterized in that form.

In this manner, the hoses are passed between the left and right standing plates of the bracket from the rear portion of the base end of the telescopic boom, so that the hoses are moved up and down with the raising and lowering operation of the telescopic boom.
The hoses protrude backward as they enter and exit the space
No, not inhibit diameter of the pivoting range, hoses is never twisted. Further, the hoses are accommodated in the bracket, and the hoses do not protrude outside from the revolving unit. In addition, by passing hoses through the bracket, an orderly impression is given and the appearance is improved. Also,
A reinforcing plate is provided between the left and right standing plates,
The strength of is improved. Also, a guide plate was provided between the standing plates.
The hoses fall when the telescopic boom is standing
And hoses are not bent.

According to a second aspect of the present invention , the structure of the turning frame of the aerial work vehicle according to the first aspect is such that an upper portion of the rear reinforcing plate is opened.
Smooth sliding operation of the hoses near the mouth
A sliding body is provided .

By providing such a sliding body, the extension
As the shrinking boom undulates, the hoses are moved inside the upright by a sliding body.
It can be made to go in and out smoothly.

[0010]

[0011]

[0012]

FIG. 1 is a side view showing an embodiment of an aerial work vehicle to which a turning frame structure according to the present invention is applied. In FIG. 1, reference numeral 1 denotes a crawler type traveling body, and the traveling body 1 may be configured as a wheel type.
Reference numeral 2 denotes a revolving boom mounted on the traveling body 1 via a revolving device 3, and 4 denotes a telescopic boom mounted on the revolving body 2 by a boom cylinder 6 with a boom foot pin 5 as a center. Bracket 4a at the end of telescopic boom 4
Is fixed, and a mounting bracket 9 of a worktable 8 is attached to the bracket 4a so as to be vertically swingable about a pin 7. A horizontal holding hydraulic cylinder 10 is mounted between the brackets 4a and 9, and the hydraulic cylinder 10 works with the boom cylinder 6 so that the worktable 8 is always horizontal. Between the bracket 9 and the worktable 8,
A turning device 11 for turning the worktable 8 within a predetermined angle range is provided. Reference numeral 12 denotes an operation panel mounted on the work table 8.

FIG. 2 is a partial cross-sectional side view of the revolving superstructure of this embodiment, and FIG. 3 is a partial cross-sectional plan view of the revolving superstructure. Operation panel 1
Reference numeral 2 denotes an operating device provided with an operating lever for remotely controlling the expansion and contraction of the telescopic boom 4, the up and down movement, the turning operation of the turning device 3, the operation of the left and right running motors of the traveling body 1, and the like. A switch for switching the traveling speed of the traveling body 1 and a switch for causing the worktable 8 to swing in the horizontal direction by operating the worktable turning device 11. It includes a horn switch for issuing an alarm from the device, an emergency stop switch for performing an emergency stop of all actuators of the aerial work vehicle, and an engine start switch. Such an operating device and the turning device 1
A hydraulic hose for supplying pilot oil or hydraulic oil to the turning motor and the horizontal holding hydraulic cylinder 10 and a hose 13 composed of a cable for connecting to the switches are extendable and retractable on the upper surface of the telescopic boom 4. It is attached along with the telescopic boom 4 by a chain-like hose support 14 attached to the boom 4.

Reference numeral 15 denotes a bracket for mounting the telescopic boom 4 with a boom foot pin 5.
5 are left and right standing plates 1 fixed by welding to a base portion 16 of a revolving frame having a flat plate shape as shown in FIG.
7 and 17. As described above, by forming the base portion 16 of the revolving frame with a flat plate, there is an advantage that the total height of the revolving body 2 is reduced, miniaturization and stabilization are achieved, and further, cost can be reduced by simplifying the structure. is there.

Reinforcing plates 19, 20 are welded to the rear and front portions of the standing plates 17, 17 to form a substantially box shape and reinforce. In addition, openings 21 and 22 in which these reinforcing plates 19 and 20 are omitted are provided in the upper portion of the rear surface of the bracket 15 and the lower portion of the front surface thereof so as to pass the hoses 13. Hoses 13 protruding from the base end of the telescopic boom 4
The opening 21 at the rear of the bracket 15 and the left and right standing plates 1
It is drawn forward through the opening 22 at the front of the bracket 15 between 7 and 17, and connected to a valve device 23 such as a control valve or a pilot valve or a control panel (not shown) through the swivel frame.

Rear opening 2 in bracket 15
In the vicinity of 1, hoses 13 accompanying the ups and downs of the telescopic boom 4 are provided.
In order to perform the smooth sliding operation of the sliding member 24, a sliding body 24 is provided, the tip of which is curved in an arc shape and which is attached so as to be inclined so that the front becomes lower. Note that a roller may be used for the sliding body. When the telescopic boom 4 is erected as shown by a two-dot chain line in FIG.
A guide plate 25 for preventing the hoses 13 from dropping into the bracket 15 when it moves in a direction to enter the bracket 15 is provided so as to be inclined so that the front is lowered.

As described above, the hoses 13 are moved from the rear end of the base end of the telescopic boom 4 to the left and right standing plates 1 of the bracket 15.
By passing the hose between 7, 17, the hoses are not twisted due to the up / down operation of the telescopic boom. When the telescopic boom 4 is raised, the hoses 13 are connected to the bracket 1.
5, so that the hoses do not protrude rearward from the rear portion of the counterweight 26 of the revolving body, and do not hinder the reduction of the revolving radius. Further, the hoses 13 are accommodated in the bracket 15, giving an orderly impression, and the appearance is improved.

[0018]

According to the first aspect, the telescopic boom mounting bracket is constituted by left and right standing plates, and the left and right standing plates are integrally provided on the base portion of the turning device, and the hydraulic hose is attached to the telescopic boom. And the cables are passed forward from the rear end of the telescopic boom from the rear end of the base end of the telescopic boom, so that the hoses move between the vertical plates as the telescopic boom moves up and down .
The hoses do not protrude backwards
Ku, without having to inhibit the diameter of the turning range, hoses is not be twisted. In addition, the hoses fit inside the bracket, and the hoses do not protrude outside from the revolving structure, so that they do not hinder maintenance work, etc., and by passing the hoses through the bracket, an orderly impression is obtained. Giving and improving the appearance. Also, before and after the left and right standing boards
A reinforcing plate is fixedly attached to the
The opening through which the bracket is inserted increases the strength of the bracket.
You. In addition, since the guide plate is provided between the standing plates, the telescopic boom
The hoses do not fall when standing upright.
The hoses are not bent.

According to claim 2, in claim 1, before
At the lower part of the opening on the upper part of the reinforcing plate, the hoses
A sliding body is provided for smooth sliding movement of
As the shrinking boom undulates, the hoses are moved inside the upright by a sliding body.
It can be made to go in and out smoothly.

[0020]

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of an aerial work vehicle to which a structure of a turning frame according to the present invention is applied.

FIG. 2 is a partial cross-sectional side view of the revolving superstructure in the present embodiment.

FIG. 3 is a partial cross-sectional plan view of the revolving superstructure shown in FIG. 2;

[Explanation of symbols]

1: running body, 2: revolving body, 3: revolving device, 4: telescopic boom, 5: boom foot pin, 6: boom cylinder, 7:
Pin, 8: Work table, 9: Bracket, 10: Hydraulic cylinder for horizontal holding, 11: Swivel, 12: Operation panel, 13:
Hose, 14: Hose support, 15: Bracket,
16: base portion, 17: standing plate, 19, 20: reinforcing plate, 2
1, 22: opening, 23: valve device, 25: guide plate, 26: counterweight

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66F 9/06 B66F 9/08

Claims (2)

(57) [Claims] 1. A revolving structure is provided on a traveling body via a revolving device.
And a telescopic boom is mounted on the revolving structure so that
For aerial work vehicles with a workbench attached to the end of the telescopic boom
In the telescopic boomInstallBracketOf the revolving superstructure
Provided on the baseConsists of left and right standing boards,Pin the base end of the telescopic boom to the top of the upright, A reinforcing plate is fixedly provided before and after the left and right standing plates, Open the upper part of the rear reinforcing plate and the lower part of the front reinforcing plate.
Provided, A guide plate for supporting hoses is provided between the left and right standing plates.
Ke  Hoses attached to the telescopic boom,Telescopic boom base
Above the rear reinforcing plate through the curved portion rearward from the end
From the opening of the part into the space between the standing plates and supported by the guide plate
And pull it out from the lower opening of the front reinforcement plate.
By the undulation of the telescopic boom, the hoses
Are configured to enter and exit between the standing platesFeatures
The structure of the turning frame of the aerial work vehicle. 2. The hose according to claim 1 , wherein the hose is provided near an opening at an upper portion of the rear reinforcing plate.
A sliding frame structure for an aerial work vehicle, comprising a sliding body for performing a kind of smooth sliding operation .