JP2523176B2 - Multi-stage telescopic boom device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-stage telescopic boom device used in a crane or the like.

(Prior Art) As a prior art of a multi-stage telescopic boom device of this type, Japanese Utility Model Laid-Open No. 63-148694 discloses a five-stage boom using two boom telescopic cylinder devices and pulley-wire rope means. It is disclosed that the expansion device is configured to expand and contract.

(Problems to be Solved by the Invention) The present invention is an improvement of the boom telescopic device disclosed in Japanese Utility Model Laid-Open No. 63-148694, in which the number of two first cylinder devices and two second cylinder devices is reduced. Without increasing the number of extension and contraction pulleys, in particular, by identifying the mounting support position of the contraction pulley and how to hang the contraction wire rope around the pulley, 6 stages, 7 stages, 8 stages without increasing the number of telescopic cylinder devices
It is intended to provide a multi-stage boom expansion / contraction device such as a multi-stage or nine-stage boom with a simple structure and at low cost.

(Means for Solving Problems) Therefore, according to the present invention, as shown in the drawings, the base boom 1, the first intermediate boom 2, the second intermediate boom 3, the third intermediate boom 4, and the fourth intermediate boom 4 are provided. Middle boom 5, ... (n-2)
The intermediate boom and the tip boom 7 are provided with an n-stage boom that is slidably inserted in order, and the first cylinder device 8 is attached to the base end boom 1.
The base end of the piston rod 9 and the base end of the cylinder tube 11 of the first cylinder device 8 are pivotally connected to the first intermediate boom 2, and the base boom 1 is connected to the base boom 1 by the first cylinder device 8. In contrast, the first intermediate boom 2 is configured to expand and contract, the base end of the piston rod 14 of the second cylinder device 13 is attached to the first intermediate boom 2, and the cylinder tube 15 of the second cylinder device 13 is attached to the second intermediate boom 3. The base end portions of the first intermediate boom 2 and the first intermediate boom 2 are configured to extend and contract with respect to the first intermediate boom 2 by the second cylinder device 13 by pivotally connecting the base ends 12 and 16, respectively. And all of the intermediate booms 3, 4, 5 ... except the tip boom 7 have extension pulleys 20, 2 at the tips thereof.
1,22 ... are installed respectively, and these extension pulleys 20,21,22
...... around each of the extension wire ropes 24, 25, 26 ......, and one end of each extension wire rope 24, 25, 26 ...... is connected directly to the intermediate boom to which the extension pulley is attached. It is fastened 24a to the tip of the boom on the base end side, and the other end is fastened 24b to the base end of the boom on the tip end side adjacent to the intermediate boom to which the extension pulleys 20, 21, 22 ... Are attached. Then, the base end portion of the cylinder tube 15 of the second cylinder device 13 or a portion that expands and contracts integrally with the base end portion of the cylinder tube, or the base end portion of the second intermediate boom 3 and the tip end of the cylinder tube 11 of the first cylinder device 8. The pulleys for reduction 31, 32, 33 ...
... is provided, and the other end of the reduction wire rope 37 having one end fixed to the proper position of the tip boom 7 is guided to the base end side, and is successively wound around the reduction pulleys 31, 32, 33. Cylinder tube
It is fixed to the distal end of 11 or the part that expands and contracts integrally with the distal end of the cylinder tube, the base end of the cylinder tube 15 or the part that expands and contracts integrally with the proximal end of the cylinder tube, or the base end of the second intermediate boom 3. 37b is a multi-stage telescopic boom device, wherein the number of stages n is 6 or more, and (n
-3) The first to (n-3) th reduction pulleys are provided, and the odd-numbered reduction pulleys 31, 33 ... Are attached to the base end portion of the cylinder tube 15 of the second cylinder device 13 or the same. The end portion of the cylinder tube 11 of the first cylinder device 8 or the even-numbered reduction pulleys 32 ... Is pivotally supported by a portion that expands and contracts integrally with the base end of the cylinder tube or the base end of the second intermediate boom 3. The first to the (n) th ends of the wire tube for reduction 37, which is pivotally supported on a portion that expands and contracts integrally with the tip end of the cylinder tube, and has one end fixed to a proper position of the tip boom 37a toward the base end on the other end. -3)
Of at least three reduction pulleys 31, 32, 33 ... Sequentially wound around the ends of the cylinder tube 11 provided with the (n-4) th reduction pulley or The portion 37b that expands and contracts integrally with the tip end of the cylinder tube, the base end of the cylinder tube 15 or the part that expands and contracts integrally with the base end of the cylinder tube, or the base end of the second intermediate boom 3 is fastened 37b. Characterize.

(Working) Base boom 1 shown in FIG. 1, first to fourth intermediate boom 2 to
When the first cylinder device 8 contracts and extends in the boom extension state of the multi-stage telescopic boom device composed of 5 and the tip boom 7 and the boom contraction state shown in FIG. 2, the first intermediate boom 2 is the base. It only shrinks and extends with respect to the end boom 1.

However, in the boom extension state shown in FIG.
When the cylinder device 13 is reduced, between the first reduction pulley 31 and the second reduction pulley 32, between the second reduction pulley 32 and the third reduction pulley 33, and the third reduction pulley 33. Low-use pulley 33 and rope stop 37
The length of the reduction wire rope 37 between b and the second
The length corresponding to the reduced length of the cylinder device 13 is increased, whereby the tip boom 7 is three times the reduced length of the second cylinder device 13 (that is, (n-3) times, where n is the number of boom stages).
The length of the boom is reduced, and the boom is reduced as shown in FIG. 2 by the reduction operation of the first cylinder device 8 described above.

On the other hand, when the second cylinder device 13 is extended in the boom contracted state shown in FIG.
In response to the operation of extending from the intermediate boom 2, the third and the fourth
The intermediate boom 4,5 and the tip boom 7 are extended by the extension wire ropes 24, 25, 26, respectively, and
When the cylinder device 8 is extended, the boom is extended as shown in FIG.

As described above, according to the present invention, the proximal boom, the plurality of intermediate booms, and the distal boom that are telescopically inserted,
Two telescopic cylinder devices provided inside the base boom and the first and second booms, an extension pulley and an extension wire rope provided outside the boom, and a reduction pulley provided on the telescopic cylinder device. It is possible to provide a multi-stage telescopic boom device having 6 or more stages by using the reduction wire rope, and it is possible to easily increase or decrease the number of stages by appropriately adding or removing the intermediate boom, the pulley and the wire rope. The multi-stage telescopic boom device can be manufactured easily and inexpensively with an extremely simple structure.

(Embodiment) FIGS. 1 and 2 show an embodiment of a 6-stage telescopic boom according to the present invention, in which a base end boom 1, a first intermediate boom 2, a second intermediate boom 3, a third intermediate boom 4, and a fourth intermediate boom are shown. 5 and the tip boom 7 are sequentially inserted and removed so that the base boom 1
And a first intermediate boom 2, a first telescopic cylinder device 8 is provided, and a piston rod 9 of the first telescopic cylinder device 8 is provided.
Is pivoted to the inner proximal end of the proximal boom 1 by a pin 10, and the proximal end of the cylinder tube 11 is pivotally secured to the inner proximal end of the first intermediate boom 2 by a pin 12 to form a first cylinder device. 8
Thus, the first intermediate boom 2 extends and contracts with respect to the base boom 1. Further, the base end portion of the piston rod 14 of the second cylinder device 13 is pivotally attached to the inner base end portion of the first intermediate boom 2 by the pin 12, and the base end portion of the cylinder tube 15 is connected by the pin 16 to the second intermediate boom 3 The second is connected to the base end of
The cylinder device 13 is configured to extend and retract the second intermediate boom 3 with respect to the first intermediate boom 2.

In order to extend the booms 4, 5 and 7 on the tip side of the second intermediate boom 3, extension pulleys 20, 21 and 22 are attached to the tips of the second, third and fourth intermediate booms 3 and 4, respectively. The extension wire ropes 24, 25, and 26 are wound around the extension pulleys, respectively, and both ends of these extension wire ropes are connected to the intermediate booms having the extension pulleys, and the booms on the straight base end and the straight tip side are adjacent to each boom. Bind to. This will be described typically for the extension wire rope 24. One end of the extension wire rope 24
24a is fixed to the tip end of the first intermediate boom 2 on the direct base end side adjacent to the second intermediate boom 3 to which the extension pulley 20 is attached, and the other end 24b of the extension wire rope 24 is used for extension. The pulley 20 is fixedly attached to the base end portion of the third intermediate boom 4 on the immediate front end side adjacent to the second intermediate boom 3 to which the pulley 20 is attached.

Further, in order to reduce the booms 4, 5 and 7 on the tip side of the second intermediate boom 3, three reduction pulleys 31, 32 and 33 are provided, and odd numbered pulleys, that is, the first and third reduction pulleys. Small use pulley
31 and 33 are a base end portion of the tube 15 of the second cylinder device 13 and a portion that expands and contracts integrally with the base end portion, that is, the second
It is attached to the base end of the intermediate boom 3, and an even numbered pulley, that is, a second reduction pulley 32 is provided on the tip of the tube 11 of the first cylinder device 8, and one end 37a is attached to the tip boom 7.
The other end of the wire rope 37 for reduction, which is fixed in place at the tip of the
37b is sequentially passed around the first, second and third reduction pulleys 31, 32, 33, and then the tube 11 of the first cylinder device 8 in which the second reduction pulley 32 is provided. It is fixedly mounted on a bracket 38 which is vertically installed and fixed to the tip.

FIGS. 3 and 4 show a modification of the 6-stage telescopic boom shown in FIGS. 1 and 2. In this example, the third reduction pulley 33 is used as the base of the cylinder tube 15 of the second cylinder device 13. It is pivotally supported by a pin 40 on a bracket 39 which is erected and fixed at the end.

In this example, the reduction pulleys 31 and 3 through which the reduction wire rope 37 passes
Since the 2,33 and wire rope terminals 37b are provided on the first and second cylinder devices 8 and 13, the cylinder device and the reduction pulley are assembled as one assembly as shown in FIG. It can be incorporated and the manufacturing can be simplified.

FIG. 6 shows an embodiment of a 7-step telescopic boom device according to the present invention. As is clear from the illustrated embodiment, according to the present invention, the structure of the 7-step telescopic boom device is basically the same as the structure of the 6-step telescopic boom device described above, and structurally, the number of boom steps increases. However, only the extension pulley and the extension wire rope and the reduction pulley are added, and the operation is substantially the same. Therefore, in the drawings,
The same parts as those shown in FIG. 2 are indicated by the same reference numerals.

In this example, since the fifth intermediate boom 6 is added, the extension pulley 23 and the extension wire rope 27 are added, and the reduction pulley 34 is added.

7 and 8 are modifications of FIG. 6 and have the same effects as the modifications shown in FIGS. 3 and 4 described above.

Figures 9 and 10 show reduction pulleys 35 and 36 have been increased8
3 shows an assembly of a telescopic cylinder device for a 9-step telescopic boom and a 9-step telescopic boom and a reduction pulley and a reduction wire rope 37.

(Effects of the Invention) When a boom expanding / contracting device is normally provided in multiple stages, a cylinder device is added in accordance with the number of boom stages to be added. For example, when the 5-step boom device (FIG. 1) described in Japanese Utility Model Laid-Open No. 63-148694 is changed to a 6-step boom device, as shown in FIG. Installed on the base end side of the boom device (Fig. 1) and added the booms 27 and 5
It is necessary to provide the cylinder device 28 between the step boom device (FIG. 1).

In this way, adding a cylinder device each time a boom is added requires that all the cylinder devices be inserted in the telescopic boom, so the boom telescopic device itself becomes very large and the weight of the boom telescopic device as a whole increases. To do. Further, when the boom telescopic device is extended, the position of the center of gravity of the entire boom telescopic device moves to the boom tip side by the amount of the cylinder device added.

For this reason, the lifting capacity of the crane must be reduced by the amount by which the total weight of the boom telescopic device has increased and by which the center of gravity has moved to the boom tip side. Further, since the total weight of the boom telescopic device is increased, the base for supporting the boom telescopic device, the boom hoisting cylinder device for hoisting the boom telescopic device, and the like must be increased, which causes a problem that the entire crane device is increased.

According to the present invention, as compared with the boom telescopic device disclosed in Japanese Utility Model Laid-Open No. 63-148694, the pulleys for extension and contraction are provided without increasing the numbers of the two first cylinder devices and the second cylinder devices. The number of boom extension telescopic cylinder devices can be increased without increasing the number of boom extension telescopic cylinder devices by specifying the mounting support position of the reduction pulley and the way of winding the reduction wire rope around the pulley. It is possible to reduce the manufacturing cost of the multi-stage boom telescopic device such as 6-stage, 7-stage, 8-stage, 9-stage, and obtain the multi-stage boom telescopic device at low cost. That is, the cylinder device is composed of two first cylinder devices and two second cylinder devices, and the number of extension and contraction pulleys may be simply increased for each additional boom stage, and the weight of the boom telescopic device as a whole is reduced. can do. By this weight reduction,
It is not necessary to reduce the lifting capacity of the crane more than necessary even if the number of booms is increased, and the crane device itself can be manufactured compactly.

According to the present invention, the multi-stage telescopic boom device has an extremely simple structure and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a six-stage telescopic boom device according to the present invention in an extended state, and FIG. 2 is a schematic vertical sectional view showing the boom device shown in FIG. 1 in a reduced state, FIG. 4 is a longitudinal sectional view showing a modified example of the boom device shown in FIGS. 1 and 2 in an expanded and contracted state, and FIG. 5 is a telescopic cylinder device and a contraction pulley shown in FIG. A side view of an assembly with a wire rope for reduction, FIG. 6 is a schematic vertical sectional view of a 7-step telescopic boom device according to the present invention, and FIG. 7 is a vertical sectional view showing a modified example of the boom device shown in FIG. Fig. 8 is a side view of the assembly of the telescopic cylinder device shown in Fig. 7 and a pulley for reduction and a wire rope for reduction, and Figs. 9 and 10 are for 8-stage and 9-stage telescopic boom devices. Assembly of cylinder device with reduction pulley and reduction wire rope It is a schematic side view of a. 1 ... Base boom, 2, 3, 4, 5, 6 ... Intermediate boom 7 ... Tip boom, 8 ... First cylinder device 9 ... Piston rod, 11 ... Cylinder tube 13 ... Second cylinder Device, 14 …… Piston rod 15 …… Cylinder tube, 20,21,22,23 …… Extension pulley 24,25,26,27 …… Extension wire rope 31,32,33,34,35,36… … Reduction pulley 37 …… Reduction wire rope 38,39 …… Bracket

Claims (1)

(57) [Claims] 1. A base end boom 1, a first intermediate boom 2, a second intermediate boom 3, a third intermediate boom 4, a fourth intermediate boom 5, ...
... The (n-2) th intermediate boom and the tip boom 7 are provided with an n-th stage boom that is slidably inserted in order.
The base end portion of the piston rod 9 of the cylinder device 8 is connected to the first intermediate boom 2 by the cylinder tube 11 of the first cylinder device 8.
The first cylinder device 8 is configured to extend and retract the first intermediate boom 2 with respect to the base boom 1, and the second intermediate cylinder 2 is connected to the second cylinder device 13. The base end of the piston rod 14 of the second intermediate boom 3
In addition, the base end portions of the cylinder tubes 15 of the second cylinder device 13 are pivotally connected 12 and 16, respectively, and the second cylinder device 13 is configured to extend and contract the second intermediate boom 3 with respect to the first intermediate boom 2. Extension pulleys 20, 21, 22 ... are provided at the tips of all the intermediate booms 3, 4, 4 ... except for the base boom 1, the first intermediate boom 2 and the tip boom 7, and these extension pulleys are provided. Wire rope for extension for each of 20,21,22 ……
24,25,26 …… wrapped around the wire rope for each extension 24,25,26
One end of ...... is fixed to the tip end of the boom on the direct base end side adjacent to the intermediate boom to which the extension pulley is attached, and the other end is attached to the extension pulleys 20, 21, 22 ,. Fixed to the base end of the boom on the front end side adjacent to the intermediate boom 24b
Then, the base end portion of the cylinder tube 15 of the second cylinder device 13 or a portion that expands and contracts integrally with the base end portion of the cylinder tube, or the base end portion of the second intermediate boom 3 and the tip end of the cylinder tube 11 of the first cylinder device 8. And pulleys for shrinkage 31, 32, 33.
37a The other end of the reduction wire rope 37 is guided to the base end side and sequentially hung around the reduction pulleys 31, 32, 33 ... And then integrated with the tip of the cylinder tube 11 or the tip of the cylinder tube. A multi-stage telescopic boom device which is fixedly attached to a portion that expands and contracts, a base end portion of the cylinder tube 15 or a portion that expands and contracts integrally with the cylinder tube base end portion, or a base end portion of the second intermediate boom 3, The number of stages n is 6 or more, (n-3) first to (n-3) reduction pulleys are provided, and odd-numbered reduction pulleys 31, 33 ... Are provided in the second cylinder device 13. Of the cylinder tube 15 or a portion of the cylinder tube 15 that expands and contracts integrally with the base end of the cylinder tube or the base end of the second intermediate boom 3 and is supported by an even numbered reduction pulley 32.
Is pivotally supported on the tip end of the cylinder tube 11 of the first cylinder device 8 or on a portion that expands and contracts integrally with the tip end of the cylinder tube, and the other end of the wire rope 37 for reduction which is fixed at 37a to the tip boom is connected to the other end. Lead to the base end side and the first to the (n-
3) At least three or more reduction pulleys 31, 32, 33, ... After being successively wound around, the tip of the cylinder tube 11 provided with the (n-4) th reduction pulley. Portion 37b or a portion thereof that expands / contracts integrally with the tip end of the cylinder tube, a base end portion of the cylinder tube 15 or a portion integrally expands / contracts with the base end portion of the cylinder tube, or a base end portion of the second intermediate boom 3 is fixed 37b. A multi-stage telescopic boom device characterized in that