JPH0323194A - Telescopic boom device - Google Patents

Abstract

PURPOSE:To make a telescopic boom device in multiple stages without increasing the weight of the boom device by combining together one telescopic cylinder unit with sheaves and wire ropes. CONSTITUTION:Intermediate boom sections 2 to 4 and a top boom section 6 inserted closely in sequence into a base boom section 1 are provided, and a telescopic cylinder unit 10 is installed between the base boom section 1 and the intermediate boom section 2. The top of a piston rod 11 is connected to the base end of the boom section 1, and the base end of a cylinder tube 13 is connected to the base end of the intermediate boom section 2. When a cylinder system 10 is extended with a boom retracted, the intermediate boom section 2 is started to be pulled out from the base boom section 1 and, at the same time, extending wire ropes 25 to 27 are pulled through extension sheaves 20 to 22 to pull out the intermediate boom sections 3 and 4 and the top boom section 6 simultaneously. The retraction of the boom an also be made in the same manner as the extension of it. Thus, telescopic operation can be made by using only one cylinder unit 10 without increasing the weight of the boom.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multi-stage telescopic boom device for a hydraulic crane, particularly a five-stage telescopic boom device.
This invention relates to a multi-stage telescopic boom device having more than one stage.

(Prior Art) In recent years, there has been a tendency for crane boom devices to become longer, and in order to prevent the weight of the boom device from increasing due to the lengthening, a technique disclosed in Japanese Utility Model Publication No. 17433/1983 was proposed. A four-stage telescopic boom device is known which combines one telescopic cylinder device, a pulley, and a wire rope as shown in FIG.

(Problem to be solved by the invention) The present invention solves the problem without increasing the number of telescopic cylinder devices.
The present invention aims to provide a multi-stage telescopic boom device with five or more stages without significantly increasing the weight of the boom device by combining one telescopic cylinder device, a pulley, and a wire rope.

(Means for Solving the Problems) According to the present invention, (n-2) intermediate booms are arranged in the base end boom, from the base end side to the first intermediate boom, the second intermediate boom, and the third intermediate boom. The booms are slidably inserted one after another as the first (n-2) intermediate boom, and the (n-2)th boom on the tip side is
) The tip boom is slidably inserted into the intermediate boom to form an n-stage boom (where n is an integer of 5 or more), and the proximal end of the piston rod of the telescopic cylinder device is attached to the proximal boom. , the proximal end portions of the cylinder tubes of the telescopic cylinder device are connected to the first intermediate boom with pins so that the first intermediate boom is extended and contracted with respect to the proximal boom by the telescopic cylinder device; 1st, 2nd, 3rd ---
. . . first, second, and third (n-2) extension pulleys are provided at the tip side ends of all intermediate booms of the (n-2)-th intermediate boom, and the first, second, and The first, second, and third pulleys are respectively attached to the third and (n-2) extension pulleys.
------------The (n-2)th extension wire rope was wound around each, and an extension pulley around which the extension wire rope was wound was attached to one end of each extension wire rope. It is fixed to the distal end of the immediate proximal boom adjacent to the intermediate boom, and the other end of the proximal boom adjacent to the intermediate boom is attached to an extension pulley around which the extension wire rope is wound. a first reduction wire fixed to the proximal end, a first reduction pulley provided at the proximal end of the first intermediate boom, and one end fixed to the distal end of the proximal boom; The other end of the rope is guided to the proximal end and hung on the first reduction pulley, and then guided to the distal end and fixed to the proximal end of the second intermediate boom,
(n-3) retraction pulleys are provided at the proximal end of the second intermediate boom and at the distal end of the cylinder tube of the telescopic cylinder device; As the (n2) retraction pulley, one pulley was installed sequentially and alternately from the base end of the second intermediate boom to the tip of the cylinder tube of the telescopic cylinder device, and one end was fixed to the appropriate position on the tip boom. The other end of the second retraction wire rope is guided to the proximal end, and the second retraction pulley provided at the proximal end of the second intermediate boom is then passed to the distal end of the cylinder tube of the telescopic cylinder device. After the third retraction pulley provided in It is fixed to one of the side ends where the last retracting pulley is not attached.

According to the present invention, the first extension pulley is provided at the distal end of the cylinder tube of the extension cylinder device, and the other end of the first extension wire rope has one end fixed to the base end of the base boom. may be guided to the distal end side and hung around the first extension pulley, and then guided to the proximal end side and fixed to the proximal end of the second intermediate boom.

Further, according to the present invention, the first retraction pulley can be provided at the proximal end of the cylinder tube of the telescopic cylinder device.

Further, according to the present invention, the retraction pulley provided at the proximal end of the second intermediate boom is provided on the slide member that is slidable on the cylinder tube of the telescopic cylinder device, and one end is attached to the slide member. The other end of the fixed Lm small wire rope may be guided to the proximal end and wrapped around the first reduction pulley, and then guided to the distal end and fixed to the distal end of the proximal boom. .

Further, according to the present invention, a supplementary proximal boom is provided on the outside of the proximal boom, and the supplementary proximal boom is slidably fitted into the proximal boom, and a telescopic cylinder device is provided at the proximal end of the supplementary proximal boom. It is also possible to connect the piston rod with a pin, with the piston rod serving as a cylinder tube, so that the cylinder arrangement allows the proximal boom to extend and retract with respect to the supplementary proximal boom.

(Function) According to the present invention, in operation, when the telescopic cylinder device 10 is retracted in the boom extended state shown in FIG. The retraction wire rope 36 is pulled through the first retraction pulley 30 and the second intermediate boom 3 begins to retract into the first intermediate boom 2 at the same time. When the second intermediate boom 3 begins to be stored inside the first intermediate boom 2, the length of the second reduction wire rope 37 stretched between the second reduction pulley 31 and the third reduction pulley 32 increases. As the length increases, the length of the second reduction wire rope 37 between the second VrA small pulley 31 and the terminal 38 becomes shorter, so that the third intermediate boom 4 is inside the second intermediate boom 3 and the tip boom 6 is inside the second intermediate boom 3. They are simultaneously stored in the third intermediate boom 4, and finally reach the fully retracted state shown in FIG.

Furthermore, when the telescopic cylinder device 10 is extended in the boom retracted state shown in FIG.
The third elongating wire ropes 2526, 27 are connected to the first, second, third elongating pulleys 20, 21. 22, and the second intermediate boom 3, third intermediate boom 4, and tip boom 6 are simultaneously pulled out and extended.

(Example) Figures 1 and 2 show an example in which the present invention is implemented in a five-stage telescopic boom device. The illustrated five-stage telescopic boom device includes a base end boom 1, first to third intermediate booms 2 to 4, and a tip boom 6, which are sequentially inserted and inserted into the base end boom 1 so as to be freely removable.
A telescopic cylinder device 10 is installed between the proximal boom 1 and the first intermediate boom 2, and the tip of its piston rod 11 is connected to the proximal end of the proximal boom 1 by a pin 12. The proximal end of the boom 2 is connected to the proximal end of the first intermediate boom 2 by a pin 14 .

The first to third extension pulleys 20, 21. are provided at the distal ends of the first to third intermediate booms 2, 3.4, respectively. Install 22,
The first to third extension wire ropes 2 are attached to these extension pulleys.
5. 26. 27, and connect both ends of these wire ropes to the front and rear booms, that is, the third and fourth wire ropes on the tip side.
It is fixed to the intermediate booms 3 and 4, the proximal end of the distal boom 60, and the distal end of the proximal boom 1 and the first and second intermediate booms 2 and 3, respectively.

First and second retraction pulleys 30. 31 respectively. A first reduction wire row 136 is wound around the first reduction pulley 30. That is, both ends of the first reduction wire rope 36 are fastened 45. to the proximal end of the second intermediate boom 3 and the distal end of the proximal boom l, respectively. Hang it with 44L.

A bracket 15 is provided at the distal end of the cylinder tube l3 of the telescopic cylinder device 10, a third retracting pulley 32 is provided on the bracket 15, and a second retracting wire rope 3 is provided with a third retracting pulley 32.
One end of 7 is fixed 38 at a proper place on the tip boom 6, and this second
The other end of the reduction wire rope 37 is guided to the proximal end side, and the reduction pulley 31. 32, the other end is fixed 39 to the proximal end of the second intermediate boom 3.

In this example, as shown in FIG. 2, when the telescopic cylinder device 10 is extended, the first intermediate boom 2 begins to be pulled out from the proximal boom 1, and along with this, the first to third telescopic wire ropes 25. 26. 27 are the first to third extension pulleys 20, 21. 22, the second intermediate booms 3, 4 and the tip boom 6 are simultaneously pulled out and extended.

Conversely, in FIG. 1, when the telescopic cylinder device lO is retracted, the first intermediate boom 2 begins to be retracted into the proximal end boom 1, and the first retracting wire rope 36 moves toward the first retracting pulley 30.
, and the second intermediate boom 3 simultaneously begins to retract within the first intermediate boom 2. When the second intermediate boom 3 begins to be stored inside the first intermediate boom 2, the length of the second reduction wire row 137 stretched between the second and third reduction pulleys 31 and 32 becomes longer. The length of the second reduction wire rope 37 between the second reduction pulley 31 and the terminal 38 is shortened, the third intermediate poom 4 is inside the second intermediate boom 3, and the tip boom 6 is inside the third intermediate boom 3. They are simultaneously stored in the boom 4, and finally reach the fully retracted state shown in FIG.

FIG. 3 shows an example in which the present invention is implemented in a six-stage telescopic boom device. In this example, the third intermediate boom 4 and the tip boom 6 are used in the five-stage telescopic boom device described above with reference to FIGS. 1 and 2.
A fourth intermediate boom 5 is removably inserted between the fourth intermediate boom 5, a fourth extension pulley 23 is attached to the distal end of the fourth intermediate boom 5, and a fourth extension pulley 23 is attached to the fourth extension pulley 23. A wire rope 28 is hung around, and both ends of the wire rope are connected to the front and rear booms, that is, connected to the proximal end of the tip boom 6 and the tip end of the third intermediate pool 4.

Furthermore, a fourth reduction pulley 33 is added to the proximal end of the second intermediate boom 3, and a second reduction wire rope 37 is connected to the pulley 3.
1. 32 and then the pulley 33, and the end of the rope is connected to the cylinder tube 13 of the telescopic cylinder device IO.
It is fastened 40 to a bracket 15 provided at the distal end of the holder.

The telescopic operation of the six-stage telescopic boom device shown in FIG. 3 described above is performed in the same manner as the five-stage telescopic boom device shown in FIGS. 1 and 2.

Next, in the case of a 7-stage telescopic boom device, a boom is added to the tip of the fourth intermediate boom 5 of the 6-stage telescopic boom device described above with reference to FIG. Wire rope may be added (not shown). FIG. 4 shows how to wrap the second contraction wire rope 37 in the case of a seven-stage telescopic boom device. That is, in addition to the configuration of the six-stage telescopic boom device, a fifth retraction pulley 34 is added on the bracket l5, and a second retraction wire rope 37 is added.
The terminal thereof is fixedly attached 39 to the proximal end of the second intermediate pool 3.

In this way, as the number of boom stages increases, a reduction pulley is sequentially added to the proximal end of the second intermediate boom 3 or to the bracket 15, and the second reduction wire rope 37 is wrapped around these pulleys. The terminal may be fixed to the proximal end of the second intermediate boom 3 or to the bracket 15. FIG. 5 shows a modification of the embodiment shown in FIG. 1, and in this example, in the structure shown in FIG. 1 intermediate boom 2
The first elongating wire row 125 is wound around the first elongating pulley 20, and the first elongating wire row 125 is wound around the first elongating pulley 20. Both ends are fastened 42 and 43 to the base end of the base boom l and the base end of the second intermediate boom 3, respectively. By taking precautions in this manner, the overall height of the boom device can be reduced.

FIG. 6 shows another modification of the embodiment shown in FIG. 1, and in this example, in the structure shown in FIG. A pulley 30 is provided at the proximal end of the cylinder tube l3 of the telescopic cylinder device 110. This configuration allows the first retraction pulley 30 to be integrated with the telescopic cylinder device 10, which is suitable for assembling a boom device.

FIG. 7 shows another modification of the embodiment shown in FIG. 1, and in this example, in the structure shown in FIG. The pulley 31 is attached to the slidable slide member l6 on the cylinder tube 13 of the telescopic cylinder device 10, and the second intermediate boom 30
A first reduction wire rope 36 fixed to the base end is fixed 45 to this slide member 16. With this structure, the contraction of the first intermediate boom 2 causes the first
The sliding member l6 is pulled by the reduction wire rope 36, and thereby the second reduction wire rope 37 is pulled, so that the tip poop 6, the third intermediate boom 4, and the second intermediate poop 3 are simultaneously reduced. According to this embodiment, the second
Since the retraction pulley 3l can be integrated with the telescopic cylinder assembly 210 via the slide member 16, assembly of the boom device can be facilitated.

FIG. 9 shows another modification of the embodiment shown in FIG. The piston rod 11 of the telescopic cylinder device 10 is constructed of a cylinder tube, and the piston rod 18 is slidably inserted into the hollow piston rod 1l.
The outer end of the boom 8 is connected to the base end of the supplementary proximal boom 7 by a pin l9, thereby allowing the proximal boom 1 to extend and contract with respect to the supplementary proximal boom 7. Such a three-stage cylinder device is conventionally known, for example, from Japanese Utility Model Publication No. 43835/1983.

The modified example of the 5-stage telescopic boom device shown in FIG. 1 has been described above with reference to FIGS. ---
-----・1 Of course, these can also be applied to multi-stage boom devices. Furthermore, these modifications may be combined. FIG. 10 shows an example in which the modifications explained in FIGS. 5 and 9 are combined and applied to a 5-stage boom to form a 6-stage boom, and the same parts as in the above-mentioned example are indicated by the same reference numerals.

(Effects of the Invention) According to the present invention, it is possible to reduce the increase in weight of the telescopic boom device due to an increase in the number of boom stages due to the lengthening of the boom, thereby reducing the allowable lifting load of the crane due to the lengthening of the boom. can be prevented from decreasing.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view showing the five-stage telescopic boom device according to the present invention in an extended state, FIG. 2 is a schematic vertical sectional view showing the boom device shown in FIG. 1 in a retracted state, and FIG. 3 is a schematic longitudinal sectional view showing the boom device shown in FIG. 4 is a schematic longitudinal sectional view showing the six-stage telescopic boom device in an extended state, FIG. 4 is a schematic diagram showing the winding structure of the retraction wire rope in the seven-stage telescopic boom device, and FIGS. A schematic vertical cross-sectional view showing another embodiment; FIG. 8 is a cross-sectional view along the line ■-■ of FIG. 7;
The figure is a schematic vertical sectional view showing another embodiment of the present invention. l...Base end boom 2...First intermediate boom 3...Second intermediate boom 4...Third intermediate boom 5...Fourth intermediate boom 6...Tip boom 7.
...Supplementary base end poom 10...Extension cylinder device 11...Piston rod 12...Pin l3
...Cylinder tube 14...Pin 15...
Bracket 16...Slide 18...Piston rod 20. 21, 22. 23... extension pulley 25,
26, 27. 28...Wire rope for extension 30
, 31, 32, 33. 34... Reduction pulley 3
6. 37... Wire rope for reduction. Figure 2

Claims (1)

[Claims] 1. Inside the base end boom, (n-2) intermediate booms, from the base end side, a first intermediate boom, a second intermediate boom, a third intermediate boom, ------ --, the (n-2)th intermediate boom is slidably inserted one after another, and the tip boom is slidably inserted into the (n-2)th intermediate boom on the tip side to form an n-stage boom (however, n is an integer of 5 or more), the proximal end of the piston rod of the telescopic cylinder device is connected to the proximal boom, and the proximal end of the cylinder tube of the telescopic cylinder device is connected to the first intermediate boom. The first intermediate boom is connected with a pin so that the first intermediate boom can be extended and contracted with respect to the proximal boom by the telescopic cylinder device, and the first, second, and third booms are
, first, second, third, and (n-2) extension pulleys are provided at the tip side ends of all intermediate booms of the (n-2) intermediate boom, respectively; 1st, 2nd, 3rd ---
----, the first (n-2) extension pulley,
The second and third (n-2) extension wire ropes are wrapped around each other, and one end of each extension wire rope is attached to an extension pulley around which the extension wire rope is wound. The immediate proximal end side adjacent to the intermediate boom, which is fixed to the distal end of the boom, and the other end is attached to the proximal end side adjacent to the intermediate boom, on which the extension pulley around which the extension wire rope is wound is attached. A first retraction pulley is provided at the proximal end of the first intermediate boom, and one end is fixed to the distal end of the proximal boom. The other end of the short-use wire rope is guided to the proximal end, wrapped around the first reduction pulley, and then guided to the distal end and fixed to the proximal end of the second intermediate boom. (n-3) reduction pulleys are provided at the proximal end and the distal end of the cylinder tube of the telescopic cylinder device; ) The second retraction pulley is provided one by one sequentially and alternately from the base end of the second intermediate boom to the distal end of the cylinder tube of the telescopic cylinder device as a retraction pulley, and one end is fixed at a proper position on the tip boom. The other end of the wire rope was guided to the proximal end, and the second retraction pulley was installed at the proximal end of the second intermediate boom, and then the second retraction pulley was installed at the distal end of the cylinder tube of the telescopic cylinder device. After the third retraction pulley is sequentially and alternately hooked around the A telescopic boom device in which the last retracting pulley is attached to the unattached side. 2. A first extension pulley is provided at the distal end of the cylinder tube of the telescopic cylinder device, and the other end of the first extension wire rope, one end of which is fixed to the proximal end of the proximal boom, is attached to the distal end. 2. The telescopic boom device according to claim 1, wherein the boom is guided and looped around the first extension pulley, and then guided to the base end and fixed to the base end of the second intermediate boom. 3. The telescopic boom device according to claim 1 or 2, wherein the first retraction pulley is provided at the proximal end of the cylinder tube of the telescopic cylinder device. 4. A retraction pulley provided at the proximal end of the second intermediate boom is provided on a slide member that can freely slide on the cylinder tube of the telescoping cylinder device, and the first retraction pulley is attached at one end to the slide member. Guide the other end of the short-use wire rope toward the proximal end and connect it to the first
4. The telescopic boom device according to claim 1, wherein the telescopic boom device is wound around a retraction pulley, guided to the distal end side, and fixed to the distal end side end of the proximal boom. 5. A supplementary proximal boom is provided on the outside of the proximal boom into which the proximal boom is slidably inserted, and a piston rod of a telescoping cylinder device is connected to the cylinder tube at the proximal end of the supplementary proximal boom. Claims 1, 2, 3, or 4, wherein the piston rods are connected by pins, and the cylinder device allows the proximal boom to extend and contract with respect to the supplementary proximal boom.
The telescopic boom device according to any one of the above.