KR20000046655A - Telescopic boom of telescopic handler - Google Patents

Abstract

PURPOSE: A telescopic boom of telescopic handler is provided to allow each of boom segments to be simultaneously and subsequently linked by selective operation of actuating cylinder, so that extension and withdrawal operation is made smoothly and a pressurized oil supply line is simplified and is stably supported and guided. CONSTITUTION: A telescopic boom of telescopic handler comprises a first boom segment(22) rotatably fixed to a vehicle body, to which an actuating cylinder(36) being selectively operated according to supply of oil pressure is mounted; a second boom segment(24) to which front end of a driving rod(38) reciprocating according to an operation of the actuating cylinder(36) is fixed; a third and a fourth boom segments(26, 28) mounted to the second boom segment(24) to be capable of withdraw subsequently; and link devices for extending and withdrawing the third and the fourth boom segments(26, 28) simultaneously according to selective operation of the actuating cylinder(36).

Description

Telescopic Boom in Telescopic Handler

The present invention relates to a telescopic handler, and more particularly, to a telescopic boom of a telescopic handler capable of extending or contracting all boom segments at the same time and stably installing a pressure oil supply line.

Generally, but not exclusively, hydraulic vehicles are telescopic handlers, which lift and lift cargoes at relatively high locations by telescopic booms in which three or more boom segments interlock with each other and slidably assembled. It is widely used to unload it or move it to a predetermined position.

On the other hand, two hydraulic cylinders are installed in the telescopic boom of the conventional telescopic handler, thereby telescopicly operating the telescopic boom. That is, for example, a first hydraulic cylinder is provided in a first boom segment (a boom segment installed to be directly rotatable on the vehicle body) of a telescopic boom composed of four boom segments and a second boom segment slidably interlocked with the first boom segment. The second hydraulic cylinder is telescopically operated by the first hydraulic cylinder, and the second hydraulic cylinder is mounted on the fourth boom segment (most boom segment) slidingly interlocked with the third boom segment and the third boom segment. Is installed so that the four-stage boom can be extended by the second hydraulic cylinder. In addition, a separate interlock device is installed between the second boom segment and the third segment to expand and contract each of these segments relatively.

According to this configuration, for example, when the telescopic boom is fully extended, the first hydraulic cylinder is first operated to extend the second boom segment with respect to the first segment, and then the second hydraulic cylinder is operated to operate the fourth hydraulic cylinder. Extending the telescopic boom by maximizing the boom segment with respect to the third boom segment. Of course, at this time, the third boom segment is extended with respect to the second boom segment by a separate operation of the interlocking device, and the contracting operation of the telescopic boom is performed in the reverse order.

However, the telescopic boom is stretched according to the operation of the two cylinders, and the stretching speed is very slow. Also, when the third boom segment is stretched with respect to the second boom segment by the linkage, the linkage operation is not smooth. There was a problem that the operation feeling uncomfortable.

In addition, by using a plurality of hydraulic cylinders and separate interlocking device, a plurality of hoses are required, and the connection structure of the hoses increases due to the structure of the hoses, which complicates the internal structure as well as supports or guides the hoses when the telescopic boom is constructed. Due to the absence of a means for the hose to twist or break there was a problem that the pressure oil leaks.

Accordingly, the present invention has been made to solve the above-described problems, an object of the present invention to provide a telescopic boom of a telescopic handler that can stretch a plurality of boom segments using one interlock device.

Another object of the present invention is to provide a telescopic boom of a telescopic handler, which requires only one pressure oil supply line and which can be stably disposed.

1 is a side view of a telescopic handler to which the telescopic boom of the present invention is applied.

2 is a block diagram showing in detail the interlock device of the telescopic boom of the telescopic handler of FIG.

3 is a configuration diagram showing in detail the pressure supply line of the telescopic boom of FIG.

4 is a side view showing a telescopic boom partially extended or contracted.

5 is a side view showing a state in which the telescopic boom is fully extended.

♣ Explanation of symbols for the main parts of the drawing ♣

20: telescopic boom 22: first boom segment

24: second boom segment 26: third boom segment

28: fourth boom segment 32: hydraulic cylinder

36: working cylinder 38: drive rod

42: first pulley 44: first chain

46: 2nd Pulley 48: 2nd Chain

50: 3rd Pulley 52: 3rd Chain

54: 4th Pulley 56: 4th Chain

72: guider 76: sliding pad

Such objects include a first boom segment in a telescopic boom of a telescopic handler in which a plurality of boom segments are elastically fixed, rotatably fixed to a vehicle body, and having an operation cylinder selectively operated according to the supply of hydraulic pressure; A second boom segment to which a distal end portion of the driving rod reciprocating according to the operation of the operation cylinder is fixed; Third and fourth boom segments that are sequentially retractable to the second boom segment; According to the selective operation of the operation cylinder can be achieved by a telescopic boom of the telescopic handler, characterized in that it is composed of interlocking means for stretching the third and fourth boom segment at the same time.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side view of a telescopic handler to which a telescopic boom is applied according to the present invention, and FIG. 2 is a block diagram showing in detail the operating device of the telescopic boom of the telescopic handler according to the present invention. The configuration diagram showing the hydraulic hose line of the telescopic boom in accordance with the present invention in detail is shown, Figure 4 is a side view showing the telescopic boom is partially extended or contracted, Figure 5 is a telescopic boom is fully extended A side view is shown showing the condition.

First, referring to FIG. 1, the telescopic handler according to the present invention basically includes a vehicle body 10 having four driving wheels or two tracks, and the vehicle body 10 is pivoted upward by a revolving bearing 12. A sieve 14 is rotatably provided, and a plurality of outriggers 16 for stably supporting the vehicle body 10 on the ground are provided. The telescopic boom 20 is rotatably installed on the upper swing body 14 by the pivot 18.

This telescopic boom 20 is basically provided with a plurality of boom segments that are stretched by hydraulic pressure, i.e., the first boom segment that is actually rotatably installed on the upper swing body 14 as exemplarily shown in the drawing. And a second boom segment 24, a third boom segment 26, and a fourth boom segment 28 that are sequentially installed in a flexible manner with respect to the first boom segment 22. As shown in FIG. Of course, one end of the final fourth boom segment 28 is provided with a carriage member 30, the fork 34 that can actually lift or transport the cargo and is tilted by the hydraulic cylinder (32) ) Is installed.

In particular, as shown in FIG. 2, the telescopic boom 20 according to the present invention includes the second, third and fourth boom segments 24, 26, and 28 sequentially installed in the first boom segment 22. The first boom segment 22 is configured to interlock at the same time sequentially. For this sequential interlocking operation, an operation cylinder 36 is installed in the first boom segment 22, and the tip of the driving rod 38 reciprocating in the operation cylinder 36 is formed by the bracket 40. 2 is fixed to the boom segment 24. Accordingly, the second boom segment 24 is stretched relative to the first boom segment 22 in accordance with the operation of the driving rod 38 of the operation cylinder 36. Of course, the actuating cylinder 36 is connected to a hydraulic control unit (not shown) which is operated by the driver.

In addition, a first pulley 42 is installed at one front side of the second boom segment 24, one end of which is fixed to the front end of the first boom segment 22, and the other end of the second boom segment 26 is the rear end of the third boom segment 26. A part of the first chain 44 fixed to the coil is wound, and a second pulley 46 is installed on the other rear side of the second boom segment 24 symmetrically, and one end of the first boom segment 22 is installed on the pulley. The part of the 2nd chain 48 which is fixed to the front-end | tip of () and the other end is fixed to the rear end of the 3rd boom segment 26 is wound. As a result, the second boom segment 24 is stretched and the third boom segment 26 is stretched.

Similarly, a third pulley 50 is installed at one front side of the third boom segment 26, one end of which is fixed to the front end of the second boom segment 24 and the other end of the fourth boom segment 28. A part of the third chain 52 fixed to the rear end is wound, and the fourth pulley 54 is installed on the other rear side of the third boom segment 26 symmetrically, and one end of the third chain 52 is installed on the second boom segment. A part of the fourth chain 56 fixed to the tip of 24 and the other end to the rear end of the fourth boom segment 28 is wound. Accordingly, as the third boom segment 26 is stretched, the fourth boom segment 28 is stretched at the same time.

Of course, anchors 58 are preferably used for fixing to each segment 22, 24, 26, 28 of each chain 44, 48, 52, 56.

In addition, as shown in detail in FIG. 3, the telescopic boom 20 is provided with a pressure oil supply line for supplying hydraulic pressure to the hydraulic cylinder 36 installed in the fourth boom segment 28. The pressure oil supply line is connected to the hydraulic control line and is fixed to the first segment 22, the first pipe 60, and connected to the first pipe 60 and can be bent or rolled on the first segment 22 The first hose 62 which is insulated and the second hose 64 which is connected to the first hose 62 and is insulated elastically in the second to fourth segments 24, 26 and 28. A second pipe 66 connected to the second hose 64 and fixedly installed in the fourth segment 28, and a connection hose 68 connecting the second pipe 66 and the hydraulic cylinder 32 to each other. Is done. Each of these pipes and hoses is preferably connected by a connector 70 for easy and stable connection between them.

In particular, the guider 72 is provided in the third boom segment 26 to stably support and guide the second oil supply line, more specifically, the second hose 64 of the pressure oil supply line. The tip of the guider 72 is provided with a roller or pulley 74 on which the second hose 64 is hung or wound to be supported and guided. In practice, a portion of the guider 72 and the pulley 74 are positioned in the fourth boom segment 28, such that the guider 72 and the pulley 74 are stable within the fourth boom segment 28. And a sliding pad 76 which is in sliding contact with the inside of the fourth boom segment 28 at the front lower portion of the guider 72 so that the relative movement can be performed smoothly.

Of course, it is apparent that each chain and hose installed in the telescopic boom 20 should be set to a length that does not affect the maximum extension and contraction action of each boom segment when the telescopic boom is fully extended or contracted.

Hereinafter, the operation of the telescopic boom and its operation mode according to the present invention will be described in detail.

First, in the initial state as shown in FIGS. 1 to 3, when a driver or an operator operates a hydraulic control unit to work by extending a part of the telescopic boom 20, a predetermined hydraulic pressure is supplied to the operation cylinder 36 to be proportional thereto. As the driving rod 36 extends to a predetermined length, the second boom segment 24 extends in the direction of the arrow in the solid line.

As described above, the second boom segment 24 is extended and at the same time a tensile force is generated in the direction of the solid arrows on the first chain 44 and the second chain 48, and the first and second chains 44 and 48 The associated first and second pulleys 42 and 46 are also rotated in the direction of the arrow of the solid line so that the third boom segment 26 also extends in the direction of the arrow of the solid line.

In addition, as the third boom segment 26 is extended, a tensile force is generated in the direction of the solid arrows on the third chain 52 and the fourth chain 56, and the third and fourth chains 52 and 56 are formed. The associated third and fourth pulleys 50 and 54 are also rotated in the direction of the solid arrow, so that the fourth boom segment 28 is also extended in the direction of the solid arrow. Accordingly, each boom segment of the boom assembly 20 is partially extended as shown in FIG. 4.

Of course, in such a state, if the hydraulic oil is continuously supplied to the working cylinder 36 to maximize the telescopic boom 20, the respective chains 44, 48, 52, 56 and pulleys 42, 44, 48 By operation of 52, each segment 24, 26, 28 is continuously stretched to the maximum as shown in FIG. 5.

As a result, each of the second to fourth boom segments 24, 26, 28 is simultaneously extended in sequence as the driving rod 38 moves along the operation of the operation cylinder 36.

At this time, the pressure oil supply line for supplying hydraulic pressure to the hydraulic cylinder 32 installed inside the telescopic boom 20 is also extended or rolled according to the stretching operation of each boom segment. That is, as shown in 3, when the second boom segment 24 extends in the direction of the solid arrow, the first hose 62 connected to the connector 70 at the rear end thereof is also pulled in the direction of the solid arrow. At the same time, if the third and fourth boom segments 26 and 28 also extend in the direction of the solid arrow, the second hose 64 also extends in the direction of the solid arrow, where the second hose 64 is the third boom. Guided and supported by a guider 72 installed in the segment 26. That is, the second hose 64 is supported and guided by the pulley 74 of the guider 72 as the third and fourth boom segments 26 and 28 extend forward, so that the second hose 64 is smoothly developed or extended. will be. Of course, at this time, the guider 72 is smoothly moved and guided inside the fourth boom segment 28 by the sliding pad 76 provided at the bottom thereof.

On the contrary, when the telescopic boom is retracted, when the driver operates the operation cylinder 36 in the reverse direction using the hydraulic control unit, the second boom segment 24 is retracted as the driving rod 38 is retracted in the direction of the dotted arrow. It contracts in the direction of the dotted arrow.

As the second boom segment 24 is contracted as described above, tensile force is generated in the direction of the dotted arrows on the first chain 44 and the second chain 48, and the first and second chains 44 and 48 The associated first and second pulleys 42 and 46 are also rotated in the direction of the dotted arrows, so that the third boom segment 26 is also contracted in the direction of the dotted arrows.

In addition, as the third boom segment 26 is contracted, tensile force is generated in the direction of the arrow of the dotted line in the third chain 52 and the fourth chain 56, and the third and fourth chains 52 and 56 are formed. The associated third and fourth pulleys 50 and 54 are also rotated in the direction of the dotted arrows, so that the fourth boom segment 26 is also contracted in the direction of the dotted arrows. Accordingly, each boom segment of the boom assembly 20 is fully retracted in a state as shown in FIG. 1 or 2 by partially contracting or continuously contracting each boom segment as shown in FIG. 4. Will be done.

As a result, the contracting motion of the telescopic boom 20 is also the second to fourth boom segments 24, 26, 28 in accordance with the contraction movement of the driving rod 38 according to the operation of the operation cylinder 36, similarly to the stretching motion. Are simultaneously contracted sequentially.

In addition, the pressure oil supply line installed inside the telescopic boom 20 is also contracted or returned in accordance with the contracting operation of each boom segment. That is, as shown in 3, when the second boom segment 24 is contracted in the direction of the dotted arrow, the first hose 62 connected to the connector 70 at the rear end thereof is also pulled in the direction of the dotted arrow. At the same time, when the third and fourth boom segments 26 and 28 are also contracted in the direction of the dotted arrow, the second hose 64 is also contracted or returned in the direction of the dotted arrow, wherein the second hose 64 is It is guided and supported by the guider 72 installed in the 3 boom segment 26. That is, the second hose 64 is supported and guided by the pulley 74 of the guider 72 as the third and fourth boom segments 26 and 28 are contracted to the rear, so that the second hose 64 is smoothly contracted or returned. will be. Of course, at this time, the guider 72 is smoothly moved and guided inside the fourth boom segment 28 by the sliding pad 76 provided at the bottom thereof.

Accordingly, when the actuating cylinder is selectively operated to extend or contract the telescopic boom of the telescopic handler, the boom segments are simultaneously linked with each other in accordance with the elongation or contraction of the driving rod of the actuating cylinder, so that the expansion and contraction speed thereof are increased. Rapid and flexible movements are performed flexibly. In addition, during telescopic operation of the telescopic boom, the hydraulic oil supply line installed therein is stably guided and supported to prevent its twisting and damage.

As a result, according to the telescopic boom of the telescopic handler according to the present invention, by the selective operation of the operating cylinder, each boom segment is interlocked at the same time in sequence, the expansion and contraction operation is quick and flexible to improve workability and safety, The supply line is unified and reliably supported and guided so that its twisting and damage are completely prevented, thereby improving product quality.

Claims (4)

In the telescopic boom of a telescopic handler in which a plurality of boom segments are stretchable, A first boom segment 22 fixed to the vehicle body rotatably and provided with an operation cylinder 36 selectively operated according to the supply of hydraulic pressure; A second boom segment 24 connected to the distal end of the driving rod 38 of the operation cylinder 36 and guided along the guide surface inside the first segment 22; Third and fourth boom segments (26, 28) retractably installed in the second boom segment (24); Interlocking means for simultaneously stretching and contracting the third and fourth boom segments 26 and 28 according to the selective operation of the actuating cylinder 36; A first pulley 42 installed at one front side of the second boom segment 24; A first chain 44 wound around a portion of the first pulley and having one end fixed to the front end of the first boom segment 22 and the other end fixed to the rear end of the third boom segment 26; A second pulley 46 installed at the other rear side of the second boom segment 24; A part of the second pulley 46 wound around the second chain 48 having one end fixed to the front end of the first boom segment 22 and the other end fixed to the rear end of the third boom segment 26; A third pulley 50 installed at one front side of the third boom segment 26; A third chain 52 wound around a part of the third pulley 50 and having one end fixed to the front end of the second boom segment 24 and the other end fixed to the rear end of the fourth boom segment 28; A fourth pulley 54 installed on the other rear side of the third boom segment 26; A portion of the fourth pulley is wound, and one end is fixed to the front end of the second boom segment 24, and the other end is composed of a fourth chain 56 is fixed to the rear end of the fourth boom segment 28 Telescopic boom in telescopic handler. The hydraulic boom 32 is provided with a fork and a hydraulic cylinder 32 for tilting the fork, and a hydraulic oil supply line for supplying hydraulic pressure to the hydraulic cylinder 32 is provided. Telescopic boom of the telescopic handler, characterized in that the interior of the first, second, third, fourth boom segment (22, 24, 26, 28). According to claim 2, wherein the pressure oil supply line A first pipe 60 connected to the hydraulic control unit and fixed to the first segment 22; A first hose 62 connected to the first pipe 60 and flexibly housed in the first segment 22; A second hose 64 connected to the first hose 62 and elastically housed in the second to fourth segments 24, 26 and 28; A second pipe 66 connected to the second hose 64 and fixedly installed in the fourth segment 28; Telescopic boom of the telescopic handler, characterized in that consisting of a connecting hose 68 for connecting the second pipe (66) and the hydraulic cylinder (32). 4. A pulley 74 according to claim 2 or 3, which is fixed to the rear of the third boom segment 26 and is provided with a pulley 74 on which a part of the second hose 64 is wound and supported and guided at its tip. Telescopic boom of a telescopic handler, characterized in that it further comprises a guider 72 is provided with a sliding pad 76 in sliding contact with the inner surface of the four segments (28).