JPH0549785U - Simultaneous telescopic boom - Google Patents

Abstract

(57) [Abstract] [Purpose] To make it possible to reduce the diameter of the pulleys 61A and 61B of the reduction tuning device 5 so that the telescopic boom does not become unnecessarily large. [Structure] The reduction tuning device 5 includes the first boom section 1
A pair of front and rear pulleys 61 mounted near the tip portion 11a of the
A first pulley device 51 having A and 61B, a second pulley device 52 having a pair of left and right pulleys 62A and 62B provided at the base end portion of the second boom 12, and a second boom according to the number of booms. The folding guide tool 53 provided on the 12 side or the first boom section 1 side, the first pulley device 51, and the second pulley device 51.
The pulley device 52 and the wire rope 54 that is sequentially suspended around the turn-back guide tool 53, and the pair of pulleys 61A and 61B in the first pulley device 51 intersect each other at an angle when viewed from the boom extension / contraction direction. The wire ropes suspended in the pulleys 61A and 61B are installed so that they do not interfere with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a simultaneous telescopic boom in which booms of four or more stages are successively and telescopically connected, and the booms are simultaneously telescopically linked in accordance with the telescopic movement of a hydraulic cylinder for telescopic movement.

[0002]

[Prior Art]

 As a conventional example of a simultaneous expansion / contraction boom having booms of four or more stages and capable of expanding and contracting each boom at the same time, for example, there is one as shown in FIGS. In the conventional simultaneous telescopic boom shown in FIGS. 9 to 11, a total of four booms 11 to 14 are successively and telescopically connected, and between the first boom 11 and the second boom 12 at the most proximal end. An expansion / contraction hydraulic cylinder 2 is provided, and further, in conjunction with the expansion / contraction operation of the hydraulic cylinder 2, the third and fourth booms 13 and 14 are simultaneously expanded and contracted, and the contraction and contraction device is simultaneously contracted and contracted. 5 are provided respectively. The extension tuning device 4 and the reduction tuning device 5 are wire rope type devices each having a pulley and a wire rope.

The reduction tuning device 5 in the conventional simultaneous telescopic boom shown in FIG. 9 to FIG. 11 has a structure in which the inner surface of the first boom 11 and the upper surface of the second boom 12 are located near the tip of the first boom 11. A first sheave device 51 having a pair of front and rear sheaves 61A and 61B mounted so as to be located in a space between them, and a pair of left and right sheaves 62A provided near the upper surface of the base end portion of the second boom 12. 62B having a second pulley device 52, a folding guide tool 53 provided on the upper surface of the base end portion of the second boom 12 and a wire rope 54 suspended by each pulley and the folding guide tool. ing. The pulleys 61A and 61B of the first pulley device 51 are arranged in the telescopic boom extension / retraction direction (front-rear direction) so that the wire rope grooves of the pulleys are at the same height. Then, the wire rope 54 is suspended on the pulley of 62A, the pulley of 61A, the pulleys of the folding guides 53, 61B, and the pulley of 62B in this order with one end 54a fixed to the fourth boom (tip boom) 14, respectively. After that, the other end 54b of the wire rope is fixedly stretched to the fourth boom 14.

By the way, in this type of telescopic boom, as shown in FIG. 11, the ratio of the diameter D of the pulley of the reduction tuning unit 5 (for example, the diameter D _{1 of the} pulley 61A) and the diameter d of the wire rope 54 (D / There is a stipulation that d) should not be smaller than 16, and in order to increase the diameter d of the wire rope 54 in terms of tensile strength, it is necessary to increase the diameter D of the pulley. In this way, if the diameter of the pulley of the first pulley device 51 is increased, it is necessary to increase the lateral width W of the entire telescopic boom according to the diameter of the pulley, although it is not necessary in terms of boom strength. is there.

[0005]

[Problems to be solved by the device]

However, in the conventional simultaneous telescopic boom shown in FIGS. 9 to 11, the pair of sheaves 61A and 61B in the first sheave device 51 are installed side by side and the wire rope grooves of each sheave have the same height. Therefore, in order to prevent the wire ropes 54 suspended on the pulleys and the folding guides from interfering with each other, the diameter D ₁ of the pulley 61A on the front side (base side) of the pair of pulleys should be smaller than the diameter D ₁ . It is necessary to increase the diameter D ₂ of the pulley 61B on the rear side (front side). That is, the diameter D ₂ of the rear pulley 61B is only 2d (twice the diameter of the wire rope 54) + 2S (twice the distance between the wire ropes) wider than the diameter D ₁ of the front pulley 61A in FIG. growing. On the other hand, the diameter D ₁ of the pulley 61A on the front side (small diameter side) of the two pulleys can be within a range satisfying the regulation (D / d ≧ 16) related to the diameter d of the wire rope 54 as described above. Although it is made as small as possible, since the diameter D ₂ of the rear pulley 61B is larger than the diameter D ₁ of the front pulley 61A, the lateral width W of the telescopic boom is inevitably increased accordingly. There is a problem in that the telescopic boom as a whole needs to be unnecessarily increased in size (weight) due to the need to increase the size.

In view of the problems of the conventional simultaneous telescopic boom described above, the present invention makes it possible to reduce the pulley diameter of the reduction tuning device so that the telescopic boom does not unnecessarily increase in size. It is intended to provide.

[0007]

[Means for Solving the Problems]

 According to the present invention, three or more booms are sequentially extended and contracted continuously in the first boom section located at the base end side, and further, the first boom section and the second boom section is connected to the front side of the first boom section. A hydraulic cylinder for expansion and contraction is provided between the booms, and each boom after the third boom, which is located ahead of the second boom, is linked to the extension operation of the hydraulic cylinder by a wire rope type extension tuning device. In the simultaneous telescopic boom in which the booms are simultaneously extended and the booms after the third boom are simultaneously reduced by the wire rope type reduction and synchronization device in conjunction with the reduction operation of the hydraulic cylinder, the reduction and synchronization device includes Positioned in the space portion formed between the inner surface of the first boom section and the upper surface or the lower surface of the second boom at a position near the tip of the first boom section A first pulley device which is attached as described above and has a proper number of pairs of front and rear pulleys according to the number of stages of the boom, and a suitable number depending on the number of stages of the boom, which is provided at the base end portion of the second boom. A second sheave device having a pair of left and right sheaves, a turn-back guide provided on the second boom side or the first boom section side, and the first sheave according to the number of steps of the boom. And a second sheave device and a wire rope that is sequentially suspended around the inner device, and the pair of sheaves in the first sheave device intersect each other at an angle when viewed from the boom extension / contraction direction. It is installed in such a posture that the wire ropes suspended around the pulleys do not interfere with each other.

[0008]

[Action]

 In the simultaneous telescopic boom of the present invention, the pair of front and rear pulleys in the first pulley device of the reduction tuning device are installed in such a posture that they intersect each other at an angle when viewed from the boom telescopic direction. Even if the diameters are the same as each other, the wire ropes suspended around the pair of pulley portions are not vertically displaced and the wire ropes do not interfere (contact) with each other. Even if a pair of front and rear pulleys having the same diameter are used, the wire ropes do not interfere with each other. Therefore, the diameter of each pulley is related to the diameter of the wire rope by so-called D / d. The diameter can be made as small as possible within the range that satisfies the regulations.

[0009]

[Effect of the device]

 According to the simultaneous telescopic boom of the present invention, the diameters of the pair of front and rear sheaves in the first sheave device of the reduction tuning device can be made the same as each other and satisfy the so-called D / d rule. The size of the boom can be made smaller, and thus it is possible to avoid unnecessary enlargement of the telescopic boom (the boom can be made lighter without hindering the boom strength).

[0010]

【Example】

 Some embodiments of the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 to FIG. 5 are the first embodiment of the present invention, FIG. 6 are the second embodiment, and FIG. 8 shows a simultaneous telescopic boom of the third embodiment. Further, in the first embodiment shown in FIGS. 1 to 5, a boom having a total of four stages is used, in the second embodiment shown in FIG. 6, a boom having a total of five stages is used, and further, in the third embodiment shown in FIGS. In the embodiment, a boom having a total of 6 stages is used.

In the simultaneous telescopic boom of the first embodiment shown in FIGS. 1 to 5, the first to fourth booms 11 to 14 are successively telescopically connected to each other so that they can extend and contract with each other, and the most proximal end. The hydraulic cylinder 2 for expansion and contraction is provided between the first boom 11 located at the front and the second boom 12 continuous to the front side, and the third boom 13 and the fourth boom 14 are wire rope type. The expansion and contraction tuning device 4 and the contraction tuning device 5 are configured so that they can be expanded or contracted in conjunction with the expansion and contraction operation of the hydraulic cylinder 2.

In this first embodiment, one boom (first boom) 11 located at the most proximal end constitutes the first boom section 1 in the scope of claims for utility model registration.

Two extension tuning devices 4 are used for extending the third boom 13 and extending the fourth boom 14. Each of the extension tuning devices 4 and 4 has a pulley 41 and a wire rope 42, and they are installed as shown in FIG. In this embodiment, each of the extension and adjustment devices 4 and 4 has the same structure as that used conventionally, and a detailed description thereof will be omitted.

The reduction tuning device 5 is mounted such that it is located in a space between the inner upper surface of the first boom 11 and the lower surface of the second boom 12 at a position near the tip portion 11 a of the first boom 11. A first pulley device 51, a second pulley device 52 attached to the lower part of the base end portion of the second boom 12, and a folding guide tool 53 attached to the lower surface of the base end portion of the second boom 12. It comprises pulley devices 51, 52 and a wire rope 54 suspended in turn around a folding guide 53.

The first sheave device 51 has a pair of front and rear sheaves 61A and 61B, each of which faces sideways. The front and rear pulleys 61A and 61B have the same diameter as each other and have a diameter as small as possible within a range satisfying the so-called D / d rule, depending on the diameter of the wire rope 54. When the pulley shafts P and Q of the pulleys 61A and 61B are viewed from the boom expansion and contraction direction as shown in FIG. It is installed in a posture that it is tilted in degrees. Therefore, the pulleys 61A and 61B are installed in such postures that they intersect with each other at an appropriate angle (for example, an angle of about 20 °) when viewed from the boom extension / contraction direction. As shown in FIG. In 61B, the wire rope grooves on the left and right sides are separated vertically. In addition, in this embodiment, the first pulley device 51 is installed in the space portion formed between the first boom 11 and the lower surface of the second boom 12, but in other embodiments, A space may be formed between the first boom 11 and the upper surface of the second boom 12, and the first pulley device 51 may be installed in the space on the upper side.

The second sheave device 52 has a pair of left and right sheaves 62A and 62B which are oriented vertically. Each of the pulleys 62A and 62B also has a diameter that satisfies the above D / d rule. Further, the pulleys 62A and 62B are positioned such that the wire rope grooves on the lower end side of the pulleys 62A and 62B correspond to the lower end side wire rope grooves of the laterally oriented pulleys 61A and 61B, respectively. .

As shown in FIGS. 1, 2, and 5, the wire rope 54 has one end 54a of the wire rope fixedly attached to the fourth boom (tip boom) 14, a pulley 62A, a pulley 61B, and the like. After being respectively suspended on the pulleys of the turn-back guides 53, 61A and the pulley of 62B, the other end 54b of the wire rope is fixed and stretched to the fourth boom 14.

In the simultaneous telescopic boom of the first embodiment, when the hydraulic cylinder 2 is extended from the boom contracted state, the second boom 12 extends relative to the first boom 11, and at the same time, the extension tuning devices 4 and 4 are used. The third boom 13 and the fourth boom 14 are also extended. Further, when the hydraulic cylinder 2 is contracted from the boom extended state, the second boom 12 contracts with respect to the first boom 11, and at the same time, the contraction tuning device 5 also contracts the third boom 13 and the fourth boom 14.

Further, in this simultaneous telescopic boom, the pair of front and rear side pulleys 61A and 61B in the reduction tuning device 5 are installed so as to intersect each other at an angle when viewed from the boom telescopic direction. Even if the horizontal pulleys 61A and 61B have the same diameter, the wire ropes 54 suspended by the pulleys do not interfere with each other. Further, since the diameter of each of the pair of front and rear pulleys 61A and 61B can be made as small as possible within a range that satisfies the so-called D / d rule, it is possible to avoid an unnecessary increase in size of the telescopic boom. .

The simultaneous telescopic boom of the second embodiment shown in FIG. 6 uses booms 11A and 11-14 in total of five steps by adding one extra boom 11A to the base end side of the boom of the first embodiment. is doing. The first boom 11A and the second boom 11 counting from the base end side constitute the first boom section 1 in the scope of claims for utility model registration. Further, in the second embodiment, a hydraulic cylinder 3 is provided between the two booms 11A, 11 forming the first boom section 1 so as to expand and contract between them. That is, in this second embodiment, two hydraulic cylinders 2 and 3 for expansion and contraction are used. Further, in the second embodiment, the first pulley device 51 of the reduction tuning device 5 is attached to the second boom 11 from the base end side. The rest of the configuration of the second embodiment is similar to that of the first embodiment, so its explanation is omitted.

The simultaneous telescopic boom of the third embodiment shown in FIG. 7 and FIG. 8 is provided with an extra boom in the middle of that of the second embodiment to provide a total of six booms 11A, 11-15. I'm using it. In the third embodiment, another extension tuning device 4 is added in order to extend the fourth boom 13 from the base end side. In addition, the reduction tuning device 5 includes a second boom (third boom from the base end side) 12 continuous to the front side of the first boom section 1 (consisting of the two booms 11A and 11). The third pulley device 55 (having a pair of left and right pulleys 65A and 65B) is provided. In the third embodiment, the wire rope 54 is suspended around the pulleys (61A, 61B, 62A, 62B, 65A, 65B) and the folding guide 53 as shown in FIG. The third embodiment basically operates in the same manner as the first and second embodiments.

As described above, the present invention can be applied to a simultaneous telescopic boom having four or more stages, and it goes without saying that the present invention can also be applied to a simultaneous telescopic boom having seven stages or more. For example, in a simultaneous telescopic boom using a total of 7 stages of booms, in addition to the one shown in FIG. 7, as the first pulley device 51, a further pair of pulleys is provided before or after the pair of front and rear pulleys 61A and 61B. It is necessary to add, but in that case, each pulley is installed at an angle to each other so that the wire rope suspended on the added pair of pulleys does not interfere with the wire rope suspended on the original pulley. It is necessary to install it or to shift it up and down.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a simultaneous telescopic boom according to a first embodiment of the present invention.

FIG. 2 is a bottom view of FIG.

3 is an enlarged sectional view taken along the line III-III in FIG.

FIG. 4 is a partially enlarged view of FIG.

FIG. 5 is a conceptual diagram of a wire rope suspended state in the simultaneous telescopic boom of FIG.

FIG. 6 is a vertical sectional view of a simultaneous telescopic boom according to a second embodiment of the present invention.

FIG. 7 is a vertical sectional view of a simultaneous telescopic boom according to a third embodiment of the present invention.

FIG. 8 is a conceptual diagram of a suspended state of a wire rope in the simultaneous telescopic boom of FIG.

FIG. 9 is a vertical cross-sectional view of a conventional simultaneous telescopic boom.

FIG. 10 is a plan view of FIG.

11 is an enlarged sectional view taken along line XI-XI of FIG.

[Explanation of symbols]

1 is a first boom section, 2 is a hydraulic cylinder, 4 is an extension tuning device, 5 is a reduction tuning device, 11a is a tip portion, 11
A, 11 to 15 are booms, 51 is a first pulley device, 52
Is a second pulley device, 53 is a folding guide, 54 is a wire rope, 55 is a third pulley device, and 61A and 61B are pulleys.

Claims (1)

[Scope of utility model registration request] 1. A first boom section (1) located at the base end side, and three or more booms (12-15) are successively stretched and contracted in succession, and the first boom section (1) is further provided.
And a second continuous second side of the first boom section (1)
A hydraulic cylinder (2) for expansion and contraction is provided between the booms (12), while the booms (13 to 15) after the third boom, which are located ahead of the second boom (12), are of a wire rope type. The extension tuning device (4) causes the hydraulic cylinder (2) to extend simultaneously with the extension operation of the hydraulic cylinder (2), and the booms (13 to 15) after the third boom are reduced by the wire rope type reduction tuning device (5). A simultaneous telescopic boom adapted to be simultaneously contracted in conjunction with the contraction operation of the hydraulic cylinder (2), wherein the contraction tuning device (5) is located at a position close to the tip (11a) of the first boom section (1). Of the first boom section (1) and the upper surface or the lower surface of the second boom (12) so as to be located in a space formed between them and an appropriate number depending on the number of stages of the boom. One before and after the set A first sheave device (51) having a pair of sheaves (61A, 61B), and a proper number of left and right sheaves (a pair of sheaves) provided at the base end of the second boom (12) and depending on the number of stages of the boom. 62A, 62B) second pulley device (52)
A turn-back guide tool (53) provided on the second boom (12) side or the first boom section (1) side according to the number of stages of the boom, and the first pulley device (5).
1), the second pulley device (52), and the folding guide tool (5)
3) and a pair of pulleys (61) in the first pulley device (51).
A, 61B) are installed in such a manner that they intersect each other at an angle when viewed from the boom extension and contraction direction, and the pulleys (61A, 6B) are installed.
A simultaneous telescopic boom characterized in that wire ropes suspended in 1B) do not interfere with each other.