KR102000781B1 - Boom Extending and Retracting Device - Google Patents

Abstract

The present invention relates to a boom draw-in draw-in apparatus for pulling or pulling booms at respective stages in order to extend or retract a multi-stage stretch boom, A boom extension cylinder operable to house the two-stage boom inside the first-stage boom or project outward; An outgoing wire tension adjusting unit installed on an upper inner side of the rear end of the boom of the first stage; A pair of front wire sheaves rotatably fixed to left and right sides of a cylinder end portion of the boom extension cylinder; A pair of rear wire sheaves rotatably fixed to front and rear left and right sides of the piston inlet and outlet cylinder end of the boom extension cylinder; An infeed wire tension adjusting unit installed at a lower outer side of the front end of the first stage boom, the infeed wire tension adjusting unit being provided at a front side of the rear wire sheave; Wherein the front wire sheave, the rear wire sheave, the rear wire sheave, and the infeed wire tension adjusting portion are engaged with the outgoing wire tension adjusting portion and the infeed wire tension adjusting portion, respectively, A pair of wires engaged or coupled in the path order of the adjustment portion; And a boom pull bracket fixed on one side of the wire to move in a path between the front wire sheave and the rear wire sheave and the other side fixed to the inside of the rear end of the three-stage boom.

Description

[0001] Boom Extending and Retracting Device [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draw-in draw-in apparatus for a boom, and more particularly to a draw-out and draw-in apparatus for a multi-

The telescopic boom is a kind of length variable boom widely used in many special vehicles such as a crane, a ladder,

In the case of a mobile mounted crane equipment or a high-altitude operation vehicle, it is common to make a multi-stage telescopic boom with various sizes of booms formed in a substantially rectangular tube shape. Such a multi-stage telescopic boom is elongated and contracted by a hydraulic pressure Cylinder, wire rope, chain or the like. Specifically, a plurality of hydraulic cylinders may be used, or a combination of a single hydraulic cylinder and a wire rope, or a single chain may constitute a boom extension and contraction mechanism. An apparatus for pulling in and pulling out a multi-stage telescopic boom by a combination of a wire rope and a chain is disclosed in Published Utility Model Publication No. 20-2012-0007761 (Patent Document 1).

Among them, a mechanism in which a hydraulic cylinder and a wire rope are combined is widely used because of economical efficiency of production cost and easiness of maintenance. Normally, a hydraulic cylinder is installed inside a multi-stage retractable boom while a wire rope and a wire rope The sheave for controlling the extension or contraction of the boom caused by the boom is often installed outside the multi-stage stretch boom. This is also a result of considering the ease of manufacture and maintenance and economical efficiency.

However, for example, in the case of an insulated work vehicle (also referred to as an insulated work vehicle, live wire vehicle) suitable for carrying out work in an area where electric booms and baskets are made of insulators, such as a telephone pole, There is a possibility that an accident may occur when an electric wire, a wire rope, a hydraulic reel, or the like installed on a boom of a high-altitude working vehicle comes into contact with an electric wire connected between electric poles, so that even if the production cost and the maintenance cost increase, It is common.

However, it is easy to assemble when the components such as electric wire, wire rope, hydraulic reel, etc. are inserted into a multi-stage telescopic boom in which a sliding mechanism and a hydraulic cylinder for stretching and contraction of a multi- This increases production costs and time.

Accordingly, there is a demand for a technique capable of reducing the production time while arranging all the components of the electric wire, the wire rope, and the hydraulic reel in the multi-stage boom.

Public Utility Model Publication No. 20-2012-0007761 (2012.11.13.) "Intrusion Device of Telescopic Boom"

SUMMARY OF THE INVENTION It is an object of the present invention to provide a boom draw-in draw-in apparatus for a multi-stage stretch boom which can be manufactured at a lower cost.

Another object of the present invention is to standardize and modularize the boom draw-in draw-in mechanism so that the assembly can be carried out quickly and easily, and at the same time, when a plurality of multi-stage stretch booms are assembled simultaneously or successively, And to provide a boom draw-in draw-in device for a multi-stage stretch boom capable of minimizing a deviation.

In order to achieve the above object, a boom draw-in draw-in apparatus according to the present invention is a boom draw-in draw-in apparatus for drawing or pulling booms at each end for extending or retracting a multi-stage stretch boom, versus; A first stage boom having a rear end rotatably coupled to the base stage about a first rotation axis; A boom up-down cylinder configured to push up or down the first-stage boom with respect to the proximal end of the boom by being stretched or contracted at both ends of the proximal end and the first-end boom, respectively; Stage boom, and is configured to be partially housed inside the first-stage boom by being moved along the longitudinal direction of the first-stage boom, or to be protruded outward (front end) of the first-stage boom, A two-stage boom having an end and a front end that always protrudes outwardly from the first boom; Stage boom by being moved along the longitudinal direction of the two-stage boom so as to be partially housed in the inside of the two-stage boom or to be protruded to the outside of the two-stage boom, and a rear end which is always housed in the inside of the two- A three-stage boom having a front end always protruding outwardly from the boom, the rear end lower side being fan-shaped and incised forward; The piston end portion is rotatably engaged with the first rotation shaft and the piston end side cylinder end portion is coupled to the rear end portion of the second stage boom so that the second stage boom can be housed inside the first stage boom, An activated boom extension cylinder; An outgoing wire tension adjusting unit installed on the inner upper side of the rear end of the first stage boom; A pair of front wire sheaves rotatably fixed to left and right sides of a cylinder end portion of the boom extension cylinder; A pair of rear wire sheaves rotatably fixed to front and rear left and right sides of the piston inlet and outlet cylinder end of the boom extension cylinder; An infeed wire tension adjuster installed at a lower outer side of the front end of the boom of the first stage, the infeed wire tension adjuster being disposed forward of the rear wire sheave; Wherein the front wire sheave, the rear wire sheave, the rear wire sheave, and the infeed wire tension adjusting portion are engaged with the outgoing wire tension adjusting portion and the infeed wire tension adjusting portion, respectively, A pair of wires engaged or coupled in the path order of the adjustment portion; And a boom pull bracket fixed on one side of the wire to move in a path between the front wire sheave and the rear wire sheave and the other side fixed to the inside of the rear end of the three-stage boom.

In addition, one end is fixed to the inner bottom surface of the rear end of the boom of the first boom, and the other end is fixed to the inner upper surface of the rear end of the boom of the third boom and is connected to the other end by bypassing the front end of the cylinder end of the boom extension cylinder So that at least one of the electric cable or the hydraulic hose from the rear end of the first boom to the rear end of the third boom can stably be disposed regardless of the extension or contraction of the multi-stage stretch boom .

In this case, the boom extension cylinder is fixed to both the left and right sides of the cylinder end, and has a sheave fixing hole extending upward and higher than the cylinder end, extending upward from the upper side of the sheave fixing hole, And a pair of front sheave brackets having a roller fixing extension portion having an anti-departure roller hole at a distal end portion protruding outwardly from the outer peripheral portion of the sheave, wherein the front wire sheave is fitted to the sheave fixing hole from outside, And the wire breakaway preventing roller is inserted into the release preventing roller hole so that the distance between the outer circumferential portion of the release preventing roller and the outer circumferential portion of the front wire sheave is equal to or less than 1/2 of the wire thickness. Lt; / RTI >

According to the boom draw-in draw-in apparatus of the present invention as described above, the main components for driving the multi-stage stretch boom, that is, the boom draw-in drawer unit are modularized to assemble the multi-stage stretch boom more quickly It is effective.

In addition, the boom draw-in draw-in device is modularized and standardized, thereby minimizing an assembly deviation according to an operator.

1 is a view showing an example of a vehicle provided with a multi-stage telescopic boom.
2 is a front view of a boom draw-in draw-in apparatus according to the present invention, in which the cable bayonet is not assembled.
Fig. 3 is a front view of a boom draw-in draw-in apparatus according to the present invention, in which a cable bayer is assembled.
4 is a left side view of the boom draw-in draw-in apparatus according to the present invention.
5 is a plan view (A) and a front view (B) of a boom extension cylinder in a boom draw-in drawer according to the present invention.
Fig. 6 shows a state in which the boom draw-in drawer according to the present invention is in a fully contracted state (A), a semi-extended state (B), and a fully extended state (C), respectively.
Fig. 7 shows the boom draw-in draw-in apparatus according to the invention assembled in the boom structure, respectively in a fully contracted state (A), a semi-extended state (B) and a fully extended state (C), respectively.

Hereinafter, a boom draw-in draw-in apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 2 is a front view of a boom draw-in draw-in apparatus according to the present invention, in which a cable bayon is not assembled, Fig. FIG. 4 is a left side view of a boom draw-in draw-in apparatus according to the present invention, and FIG. 5 is a front view of a boom draw-in draw-in apparatus according to the present invention, (A) and a top view (B), and Fig. 6 shows a state in which the boom draw-in drawer according to the present invention is in a fully contracted state (A), a semi-extended state (B) and a fully extended state , Fig. 7 shows the boom draw-in draw-in apparatus according to the present invention assembled in the boom structure, respectively in a fully contracted state (A), a semi-extended state (B) and a fully extended state (C), respectively.

The boom draw-in draw-in apparatus according to the present invention is a boom draw-in draw-in apparatus for drawing or pulling booms at each stage to extend or retract the multi-stage stretch boom as described above.

1 and 7, the boom draw-in draw-in apparatus of the present invention is installed inside a multi-stage stretch boom, and the multi-stage stretch boom generally includes a base stand 110 A first boom 120 rotatably coupled to the proximal end 110, a second boom 130 slidably coupled to the first boom 130, a second boom 130 coupled to the second boom 130, And a third-stage boom (140) possibly combined. This is a case where the multi-stage boom is a three-stage boom as in the illustrated embodiment, and when a multi-stage boom is four or more stages, a four-stage boom or the like will be added.

The rear end 123 of the first boom 120 is rotatably coupled to the proximal end 110 of the first boom 120 about the first rotation axis 127. The first boom 120 is rotated up and down by a boom up-down cylinder 113 which is a hydraulic cylinder. That is, the boom up-down cylinder 113 is coupled to the proximal end of the proximal boom 120 and the distal end of the proximal boom 120 by being extended or contracted by being coupled to the proximal end of the proximal end of the proximal boom 120, ) To push or pull it down.

Stage boom 130 is partially housed inside the first-stage boom 120 by moving along the longitudinal direction of the first-stage boom 120 or is operated to protrude outside the front end 125 of the first-stage boom 120 do. The rear end portion 133 of the second boom 130 is always housed in the first boom 120 so as to maintain the engagement with the first boom 120. In contrast, And the front end portion 135 of the first boom 120 is always protruded outside the first boom 120.

The boom 140 may be partially housed inside the boom 130 by moving along the longitudinal direction of the boom 130 or may be protruded outside the boom 130 do. The rear end portion 143 of the third boom 140 is always housed in the second boom 130 and the front end portion 145 is always protruded outside the second boom 130. On the other hand, the lower end of the rear boom 140 is cut out in a fan shape toward the front. This sector cutout 147 prevents the interference between the third boom 140 and the rear wire sheave 360 described below when the third boom is completely contracted and the first to third booms 120 to 140 are superimposed. .

Inside the multi-stage boom, there is provided a boom extension cylinder 200, which is a hydraulic cylinder that generates power for the expansion or contraction operation of the multi-stage boom and transmits the generated power to the boom structure.

The piston distal end 215 of the boom extension cylinder 200 is rotatably coupled to the first rotation shaft 127. The piston entrance side end portion 225 of the cylinder portion 220 of the boom extension cylinder 200 accommodating the piston 210 is coupled to the rear end portion 133 of the second boom 130. Thus, the boom extension cylinder 200 is operated to house the two-stage boom 130 inside the first-stage boom 120 or to project it to the outside. In the illustrated embodiment, the direct activation of the boom extension cylinder 200 is confined to the two-stage boom 130 and the three-stage boom 140 is operated by the withdrawing wire 330 or the withdrawing wire 340 Pulled and operated.

A pair of outgoing wire tension adjusting parts 310 are provided on the inner upper side of the rear end part 123 of the first boom 120. The outgoing wire tension adjusting unit 310 is engaged with one end of the outgoing wire 330 to fix one end of the outgoing wire 330 while one end of the outgoing wire 330 is pulled or loosened and then fixed again, And the tension applied to the lead wire 330 can be adjusted. The specific structure thereof is the same as that of a conventional wire tension adjusting device.

A pair of front wire sheaves 350 are rotatably fixed to the left and right sides of the cylinder distal end portion 235 of the boom extension cylinder 200. A sliding guide roller 290 is rotatably fixed to the left and right sides of the cylinder distal end 235 of the boom extension cylinder 200. The sliding guide roller 290 is provided so as to be smoothly moved along the bottom surface of the boom 140 at the time of extension and contraction of the boom extension cylinder 200.

A pair of rear wire sheaves 360 are rotatably fixed to the front lower left and right sides of the piston entrance and exit cylinder end portions 225 of the boom extension cylinder 200. For example, the rear wire sheave 360 may be rotatably secured to both side walls of the two-stage boom 130 as shown in the illustrated embodiment.

A pair of incoming wire tension adjusting parts 320 are installed on the lower outer side of the front end part 125 of the first boom 120. The lead wire tension adjusting unit 320 is disposed on the front side of the rear wire sheave 360.

The lead wire tension adjusting unit 320 is also engaged with one end of the lead wire 340 to fix one end of the lead wire 340 like the lead wire tension adjusting unit 310 while holding one end of the lead wire 340 Pulling or loosening, and then fixing it again, thereby adjusting the tension applied to the lead wire 340. The specific structure thereof is the same as that of a conventional wire tension adjusting device.

The pair of wires 300 that allow extension and retraction of the boom 140 are coupled to the outgoing wire tension adjusting unit 310 and the incoming wire tension adjusting unit 320, (350) and the rear wire sheave (360). The wire 300 is engaged with the sheave in the order of the outgoing wire tension adjusting part 310, the front wire sheave 350, the rear wire sheave 360 and the incoming wire tension adjusting part 320, Respectively.

In this specification, the wire 300 is described separately as the lead wire 330 or the lead-in wire 340, but the lead wire 330 and the lead-in wire 340 are separately present and collectively referred to as the wire 300 If the multi-stage boom is pulled out when one end of the wire 300 is pulled out, it is referred to as an outgoing wire 330 when referring to the vicinity of the one end, It is nothing more than a reference.

In the wire 300 constructed as described above, the exposed portion of the first boom 120 to the lower outer side of the front end portion 125 is the lead wire 340, and the lead wire 340 is provided with a pair of An incoming wire tension adjusting unit 320 is provided. A portion of the wire 300 fixed to the pair of outgoing wire tension adjusting portions 310 provided on the inner upper portion of the rear end portion 123 of the boom 120 is the outgoing wire 330.

The boom pulling bracket 370 is fixed to one side of the wire 300 so that the extension and contraction of the boom 140 can be performed by the wire 300. The boom pulling bracket 370 is fixed to the wire 300 so that one side of the boom pulling bracket 370 is moved in a path between the front wire sheave 350 and the rear wire sheave 360 and the other side is fixed to the rear end of the three- (143). When the boom extension cylinder 200 and the wire 300 are operated to extend or retract the multi-stage telescopic boom, the boom pull bracket 370 is positioned between the front wire sheave 350 and the rear wire sheave 350 360 so that the third boom 140 is stretched or contracted.

In the multi-stage stretch boom constructed as described above, when the boom extension cylinder 200, the components related to driving the wire 300 and the wire 300 (front and rear wire sheaves, wire tension adjusting unit, etc.) There is an excellent effect that the assembling time of the boom can be shortened.

Further, various devices (hydraulic equipment, electric equipment, water jetting equipment, etc.) connected to the boom 140 from the rear end 123 of the boom 120 to the boom 140 are connected to the boom 140 A cable bearer 400 may be provided to supply necessary hydraulic pressure, electricity, and the like. In the case of a hydraulic hose, the required minimum radius of curvature is relatively large, so that the hydraulic pressure is supplied to the multi-stage boom by a hydraulic reel provided outside the boom to the multi-stage boom of a normal high- It is often installed outside the multi-stage boom. However, as already mentioned, it is necessary to install not only wires but also electric wires and hydraulic hoses in the boom inside the boom for reasons of work safety, etc. At this time, electric wires and hydraulic hoses installed inside the boom There is a need to provide a structure that can flexibly cope with damage during extension and contraction of the boom.

The boom draw-in draw-in apparatus of the present invention includes a cable bearer 400. One end 410 of the cable bearer 400 is fixed to the inner bottom surface of the rear end 123 of the boom 120, The end portion 420 is fixed to the inner upper surface of the rear end portion 143 of the boom 140 and bypasses the front end of the cylinder end portion 235 of the boom extension cylinder 200 at the one end portion 410, To the end 420. The electric cables and the hydraulic hoses from the rear end 123 of the boom 1 to the rear end 143 of the boom 140 can be stably placed regardless of the extension or retraction of the boom State can be maintained.

Meanwhile, the boom draw-in drawer according to the present invention includes a pair of front sheave brackets 500 for fixing the front wire sheave 350.

The front sheave bracket 500 is fixed to both left and right sides of the cylinder distal end portion 235 of the boom extension cylinder 200 and has a sheave fixing hole 510 extending upwardly and formed at a position higher than the cylinder distal end portion 235 I have. The front wire sheave 350 is fitted in the sheave fixing hole 510 from the outside and is rotatably fixed.

The front sheave bracket 500 has a roller fixing extension portion 520 extending upward from the upper side of the sheave fixing hole 510 and the roller fixing extension portion 520 is fixed to the front wire sheave Preventing roller hole 525 at a distal end protruding outwardly from the outer peripheral portion of the guide plate 350.

In order to prevent the wire 300 from being detached from the front wire sheave 350, the release preventing roller 530 is inserted into the release preventing roller hole 525 so as to be rotatably fitted with the wire break- And the outer peripheral portion of the front wire sheave 350 are brought into close contact with each other. However, in reality, when the two outer circumferential portions are designed to closely contact each other due to problems such as assembly tolerances, there is a high possibility that problems occur during actual assembly. Therefore, the outer circumferential portion of the separation preventing roller 530 and the outer circumferential portion of the front wire sheave 350 It is preferable that the distance between the electrodes is equal to or less than 1/2 of the wire thickness.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be noted that it is determined by

100: vehicle 110:
113: Boom up-down cylinder 120: Boom 1
123: Boom rear end of the first stage 125: Boom front end of the first boom
127: first rotating shaft 130: second boom
133: second boom rear end 135: second boom front end
140: Third boom 143: Third boom rear end
145: 3-speed boom front end 147:
200: Boom extension cylinder 210: Piston
215: piston end portion 220: cylinder portion
225: piston inlet / outlet cylinder end portion 235: cylinder end portion
290: Sliding guide roller 300: Wire
310: an outgoing wire tension adjusting section 320: an incoming wire tension adjusting section
330: lead wire 340: lead wire
350: front wire sheave 360: rear wire sheave
370: boom towing bracket 400: cable bayonet
410: cable bayonet end 420: cable bayonet end
500: front sheave bracket 510: sheave fixing hole
520: roller fixing extension part 525: release prevention roller hole
530: Wire breakaway prevention roller

Claims (3)

A boom draw-in draw-in apparatus for drawing or pulling booms of each stage to extend or contract the multi-stage stretch boom,
A proximal end (110) rotatably installed on the vehicle (100);
A boom (120) having a rear end portion (123) coupled to the base end (110) so as to be rotatable up and down about a first rotation axis (127);
And a boom 120 configured to push or pull the first-stage boom 120 upward or downward relative to the base unit 110 by being extended or contracted at both ends of the boom 120 by being coupled to the base unit 110 and one side of the first- An up-down cylinder 113;
Stage boom 120 by being moved along the longitudinal direction of the first-stage boom 120 or may be partially housed inside the first-stage boom 120 or protrude outside the front end 125 of the first-stage boom 120, A two-stage boom 130 having a rear end 133 normally housed in the first boom 120 and a front end 135 always protruding outside the first boom 120;
Stage boom (130) so as to be partially housed in the inside of the two-stage boom (130) or to be protruded to the outside of the two-stage boom (130) by moving along the longitudinal direction of the two- A front end portion 145 that is always protruded outside the two-step boom 130 and a rear end portion 143 that is formed at a lower side of the rear end portion 143 in the form of a fan- A boom 140 having a three-stage boom 140 having a sector cut-out portion 147 for preventing the boom 140;
The piston end portion 215 is rotatably coupled to the first rotation shaft 127 and the cylinder end portion 225 of the piston 210 is coupled to the rear end portion 133 of the second boom 130, A boom extension cylinder 200 operated to receive or project the second boom 130 into the first boom 120;
A pair of outgoing wire tension adjusting units 310 installed on the inner upper side of the rear end 123 of the first boom 120;
A pair of front wire sheaves 350 rotatably fixed to the left and right sides of the cylinder end portion 235 of the boom extension cylinder 200;
A sliding guide roller (290) rotatably fixed to the lower left and right sides of the cylinder end portion (235) of the boom extension cylinder (200) so as to be smoothly moved along the bottom surface of the third boom (140);
A pair of rear wire sheaves 360 rotatably fixed to front and rear left and right sides of the piston inlet-side cylinder end 225 of the boom extension cylinder 200;
An incoming wire tension adjusting unit 320 provided at a lower outer side of the front end portion 125 of the first boom 120 and forward of the rear wire sheave 360;
The outgoing wire tension adjusting unit 310 and the pulling wire tension adjusting unit 320 are engaged with the front wire sheave 350 and the rear wire sheave 360, The front wire sheave 350, the rear wire sheave 360, and the lead wire tension adjusting unit 320 in the order of the paths of the first wire sheave 350, the rear wire sheave 350, the rear wire sheave 360, and the lead wire tension adjusting unit 320. And
One end fixed to the wire 300 to move in the path between the front wire sheave 350 and the rear wire sheave 360 and the other end fixed to the inside of the rear end 143 of the three- Bracket 370;
One end portion 410 is fixed to the inner bottom surface of the rear end portion 123 of the first boom 120 and the other end portion 420 is fixed to the inner upper surface of the rear end portion 143 of the third boom 140, 410 of the boom extension cylinder 200 bypasses the front end of the cylinder end portion 235 of the boom extension cylinder 200 and is connected to the other end portion 420 so as to extend from the rear end portion 123 of the first boom 120 to the rear portion of the third boom 140 A cable bonder (400) for maintaining at least one of the electric cable or the hydraulic hose to the end portion (143) stably disposed regardless of elongation or contraction of the multi-stage stretch boom;
And a sheave fixing hole 510 which is fixed to both left and right sides of the cylinder end portion 235 of the boom extension cylinder 200 and which is extended upward to be higher than the cylinder distal end portion 235. The sheave fixing hole 510 And a roller fixing extension portion 520 extending upward from the upper side of the front wire sheave 350 and having an escape prevention roller hole 525 at a distal end projecting outwardly from the outer periphery of the front wire sheave 350, The sheave 350 is fixed to the sheave fixing hole 510 by being rotatably fixed to the sheave fixing hole 510. The wire detaching roller 530 is fixed to the outer side of the separation preventing roller hole 525 so as to be rotatable, A pair of front sheave brackets (500) configured such that the distance between the outer circumferential portion of the prevention roller (530) and the outer circumferential portion of the front wire sheave (350) is not more than 1/2 of the thickness of the wire (300);
Wherein the boom draw-in inlet device comprises: delete delete

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