JPH04109989U - Reduction synchronization device for the four-stage simultaneous telescopic boom section - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] In a four-stage simultaneous telescopic boom section equipped with this type of reduction synchronization device, the fleet angle of the wire rope at the part between the small diameter pulley of the tip pulley and the turning guide tool. To simultaneously shorten the overlapping length of a first boom section and a second boom section and increase the full extension length of the boom by that amount without making A excessive. [Structure] In this type of simultaneous four-stage telescoping boom part reduction synchronization device, the wire rope 17 passing between the turning guide tool 38 and the large diameter pulley 12 is made to be in an inclined state.
The large diameter pulley 1 of the folding guide groove 39 of the folding guide tool 38
The small diameter pulley 1 of the folding guide groove 39 is positioned so that the wire rope 17 passing between the small diameter pulley 13 and the folding guide 38 is in a substantially horizontal state.
The third side is positioned higher and the folded guide groove 39 is arranged at an angle.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a reduction synchronization device for a four-stage simultaneous telescopic boom section.

0002

[Conventional technology]

As a conventional reduction synchronization device for a four-stage simultaneous telescopic boom section, for example, Figs. There is one shown in 9.

0003 In this product, the tip side is sequentially moved into the first boom section 1 on the proximal side of the boom. The second, third, and fourth boom sections 2, 3, and 4 of the Each of these boom sections 2, 3, and 4 is configured to have a hollow rectangular cross section. There is.

0004 And, between the first boom section 1 and the second boom section 2, a first 2nd boom section 2 and other 3rd and 4th boom section 1 A telescopic hydraulic cylinder 5 for telescopically driving the arm section is interposed.

[0005] The second boom section 2 is directly telescopically driven by the stroke of the hydraulic cylinder 5. However, the third and fourth boom sections 3 and 4 are hydraulically controlled via extension tuning devices, respectively. It is designed to be driven by cylinder 5.

[0006] The extension tuning device of the third boom section 3 connects one end of the wire rope 6 to the first boom section 3. The other end is attached to the front end of the third boom section 3. This wire rope 6 is held at the front end of the second boom section 2. It is constructed by winding it around a pulley 7.

[0007] Therefore, as the hydraulic cylinder 5 expands, the second boom section 2 When the first boom section 1 is displaced, the displacement is caused by the wire rope 6. is transmitted to the third boom section 3, and the third boom section 3 is transmitted to the second boom section 3. The same amount of displacement is applied to section 2.

[0008] Further, the extension tuning device of the fourth boom section 4 is connected to the second and third boom sections. The wire rope 8 connecting between sections 2 and 3 and the tip of the third boom section 3 It consists of a pulley 9 installed at the end, and the second boom section is similar to the above. When the third boom section 3 is displaced with respect to 2, this displacement causes the wire rope 8 to is transmitted to the fourth boom section 4 via the Performs a displacement of the amount.

[0009] In such a four-stage simultaneous telescopic boom section, the hydraulic cylinder 5 Even during the retraction operation, the first, second, third and fourth boom sections 1, 2, 3 and 4 must be driven for reduction by the same amount at the same time, and for this reason, the following reduction is performed. A small tuning device is provided.

0010 That is, the reduction tuning device is attached to the first boom section 1 and controls the tip pulley 11. The large-diameter pulley 12 and the small-diameter pulley 13 and the second boom section 2 are attached to the attached to the wire rope folding guide 14 and the base end of the second boom section 2. a pair of second boom section base end pulleys 15 and 16, and a wire rope 17. It is made up of.

[0011] The wire rope 17 has one end connected to one side of the base end of the fourth boom section 4. 18, and from there one of the second boom section proximal pulleys 15, 16. Car 15, small diameter pulley 13 of the first boom section tip pulley 11, folding guide tool 14 , the large diameter pulley 12 of the first boom section tip pulley 11, the second boom section base After passing the end pulley 16 in order, the other end is connected to the base end of the fourth boom section 4. It is fixed 19 on the other side.

0012 According to this, the wire rope 17 is moved from the folding guide tool 14 to the fourth boom section. The part on one side of the proximal end of the section 4 that reaches the fastening 18, and the portion from the folding guide 14 to the fourth tab. The other side of the proximal end of the boom section 4 is connected to the first boom section 19. One round trip between the suspension tip pulley 11 and the second boom section base end pulleys 15 and 16. Therefore, the second boom section 2 is compressed relative to the first boom section 1. When there is a small displacement, the wire rope 17 moves to the fourth boom by a distance twice the amount of this reduced displacement. The section 4 is retracted in a retracting direction relative to the second boom section 2.

[0013] During this retracting operation, each of the expansion tuning devices The boom section is displaced according to the amount of contraction displacement of the boom section, and each boom section is While balancing the device and each of the extension tuning devices, the first boom set is Perform a reduction displacement of the same amount as the reduction displacement of the second boom section 2 with respect to the section 1. cormorant.

[0014] The folding guide tool 14 of such a reduction tuning device is as shown in FIGS. 7 to 9. It is configured.

[0015] That is, the folding guide tool 14 is formed into a semicircular shape in plan view as shown in FIG. A folded guide groove for guiding the wire rope 17 is provided in the arc-shaped portion of the circumferential surface. 21 is formed.

[0016] The folding guide groove 21 is connected to a second boom on which the folding guide 14 is mounted. It is formed in a plane parallel to the upper plate of section 2 (see FIG. 8).

[0017]

[Problem that the idea aims to solve]

In the contraction synchronization device with the above structure, when the four-stage simultaneous telescopic boom section is fully extended, Arranged at the first boom section tip pulley 11 and at the base end of the second boom section. Distance between folding guide tool 14 and second boom section proximal pulleys 15 and 16 Dimensions become smaller.

[0018] In addition, the first boom section tip pulley 11 and folding guide tool 14 are set at their installation heights. In particular, the small diameter pulley 13 of the tip pulley 11 and the return guide The fleet angle A of the wire rope 17 in the area between the fittings 14 tends to become large. (See Figure 6).

[0019] As this fleet angle A increases, the folding guide groove 21 of the folding guide tool 14 The wire rope 17 may come off or the guide groove 21 and the wire rope 17 may wear unevenly. There is a greater risk that

[0020] In order to prevent this, the installation height of the folding guide 14 should be increased and the first block The idea is to make it approximately the same height as the small diameter pulley 14 of the base end pulley 11 of the arm section. However, in this way, the second boom section of the wire rope 17 It passes between the base end pulley 15 and the small diameter pulley 13 of the first boom section tip pulley 11. section, the folding guide tool 14 and the large diameter pulley of the first boom section tip pulley 11. Attach the wire rope folding guide as it will interfere with the part passing between 12 and 12. The height cannot be increased.

[0021] Due to these circumstances, in the conventional four-stage simultaneous telescoping boom section of this type, the front In order to avoid the fleet angle A from becoming excessively large, it is necessary to 1 boom section 1 and a second boom section to which the folding guide 14 is attached. 2, the boom section Despite the long length of the boom, the full extension length of the boom is short.

[0022] This idea was made based on this background, and this type of reduction tuning system In the four-stage simultaneous telescopic boom section with Do not make the fleet angle of the wire rope excessive in the area between the parts, and at the same time The overlap length between the section and the second boom section is shortened, and the boom is fully extended by that amount. The purpose is to increase the length of the tension.

[0023]

[Means to solve the problem]

In order to achieve this object, according to the invention according to claim 1, the first boot on the proximal side The 2nd, 3rd, and 4th boom sections on the tip side are expandable and retractable in order within the boom section. Insert the hydraulic cylinder between the first boom section and the second boom section. At the same time, the second boom section is connected to the first boom section by this hydraulic cylinder. Extension tuning using pulleys and wire ropes to adjust the amount of extension/contraction displacement of the muscle section. The device and the reduction tuning device sequentially transmit the four A stage simultaneous telescopic boom part, The reduction tuning device includes a wire fixed at both ends to both sides of the fourth boom section. - Rope and a pair of left and right second boom sections attached to both sides of the base end of the second boom section. 2 boom section base end pulley and the 2nd boom section at the center of the tip of the 1st boom section. the rotating surface of the second boom section at a position between the top plate of the second boom section and the top plate of the second boom section. A large-diameter pulley and a small-diameter pulley that are approximately parallel to the side plate are installed from the tip side of the first boom section. A first boom section tip pulley and a second boom section are arranged in order in the axial direction of the boom. The proximal end of the first boom section tip pulley on the upper plate of the proximal end of the boom section. Wire rope wrap with wire rope wrap guide groove attached to side position It has a guide tool, The wire rope extends from one fixed end thereof generally in the axial direction of the boom. one of the base end pulleys of the second boom section disposed on the same side as the fixed end; After the wire rope has passed, the wire rope is connected to the small diameter pulley at the end of the first boom section. the pulley, the folding guide, and the large-diameter pulley of the first boom section tip pulley, in this order. After that, it passes through the other second boom section proximal end pulley to the other fixed end. In the reduction synchronization device of the four-stage simultaneous telescopic boom section, The wind passing between the folding guide tool and the large-diameter pulley of the first boom section tip pulley A folding plan of the wire rope folding guide so that the ear rope is in an inclined state. The large-diameter pulley side of the inner groove is positioned low, and the first boom section Place the wire rope passing between the small diameter pulley of the end pulley and the folding guide in a substantially horizontal state. The small-diameter pulley side of the folding guide groove is positioned high so that the folding guide groove It is characterized in that the inner groove is arranged at an angle.

[0024]

[Effect]

According to the invention described in claim 1, a wire row of this kind of four-stage simultaneous telescopic boom portion is provided. Connect the folding guide groove of the folding guide tool to the large diameter pulley side of the first boom section tip pulley. It is slanted with the small diameter pulley side positioned low and the small diameter pulley side high.

[0025] Therefore, the wire that passes between the folding guide and the small-diameter pulley with a short distance This section allows you to reduce the slope of the rope when the boom is fully extended. The size of the fleet angle of the wire rope becomes smaller in minutes.

[0026] In addition, wire ropes that pass between a large diameter pulley with a long distance between the folding guide and the The slope of the boom is larger than before, but the gap distance is large, so the boom cannot be fully extended. In this case, the wire rope fleet angle will not become excessive in this area.

[0027] Therefore, if the size of the allowable fleet angle is constant, the folding guide and the small The distance between the diameter pulley and the pulley can be made shorter than before.

[0028] Therefore, the wire rope in the part between the small diameter pulley of the tip pulley and the folding guide without excessively increasing the fleet angle of the first boom section and the second boom section. By shortening the overlap length with the boom, the full extension length of the boom can be increased accordingly. Ru.

[0029]

【Example】

This invention will be explained below with reference to embodiments shown in the drawings. Regarding the reduction synchronization device for the four-stage simultaneous telescopic boom part configured in Since this is related to the folding guide that constitutes the This is the same as that described as the prior art.

[0030] Therefore, in the following description, those portions will be referred to as those of the prior art described above. The same reference numerals will be used and the respective details will not be repeated.

[0031] In Figure 1, 1 indicates the first boom section and 2 indicates the second boom section. , 31 is a pulley at the end of the first boom section, which is the four-stage simultaneous telescopic boom part of the conventional example. (arrow F in the figure indicates the boom tip side).

[0032] This tip pulley 31 is attached to a fixed bracket that fixes it to the first boom section 1. 32 and rotatably holds the large-diameter pulley 12 and the small-diameter pulley 13. holder 33, and between the fixed plate 32 and the holder 33 is the large diameter A position adjustment device 3 that adjusts the positions of the pulley 12 and the small diameter pulley 13 in the axial direction of the boom 4 is constructed, and the rotation center axis P of the large diameter pulley 12 and the rotation of the small diameter pulley 13 are The center axis Q of rotation is arranged on the center axis C of the boom (see FIG. 2).

[0033] The position adjustment device 34 of this embodiment includes a pull bolt 35 and two rows in the width direction of the boom. It is composed of a long hole 36 and a fixing bolt 37 formed in the hole 36 and the fixing bolt 37.

[0034] Then, the second boom section 2 which is on the base end side with respect to the distal end pulley 31 is On the upper plate, as in the conventional example, there is a folding guide tool spaced apart from the tip pulley 31. 38 is installed in the folding guide groove 39 of this folding guide tool 38. loop 17 is being wound.

[0035] In addition, in FIGS. 1 to 4, 17a is the second boom section of the wire rope 17. 17b and 17c show the part leading to the pulley 15 at the proximal end, and 17b and 17c lead to the folding guide tool 38. A portion 17d indicates a portion leading to the second boom section proximal end pulley 16.

[0036] As shown schematically in FIG. 17b extending parallel to the center axis C of the boom and the center of the boom from the small diameter pulley 13 side. The portion 17c extending parallel to the axis C is the folding guide groove 39 of the folding guide tool 38. Its dimensions are selected so that it can be wound tangentially on both ends of.

[0037] Therefore, in this folding guide tool 38, the folding guide groove 39 drawing an arc shape The position of the center R is the rotation center axis P of the large diameter pulley 12 and the rotation of the small diameter pulley 13. The center axis Q is displaced laterally from the boom center axis C where the boom center axis Q is located. The wire rope 17 can be wrapped around the folding guide 38 regardless of the expansion and contraction displacement of the arm. The angle can always be kept constant.

[0038] Also, in the folding guide tool 38 of this embodiment, similarly to the conventional example, It is installed at a lower height than the end pulley 31, and the interval dimension is Since the modulus is the smallest, the overlap between the first boom section 1 and the second boom section 2 is When the boom is fully extended, with a short length L, the wire rope There is a risk that the fleet angle A of No. 17 will increase significantly.

[0039] In contrast, the wire rope 17 is wound with the folding guide 38 of the embodiment of the present application. In the folding guide groove 39, the 17c portion side leading to the small diameter pulley 13 is positioned higher. and tilt it so that the 17b side leading to the large diameter pulley 12 side is positioned lower. (See Figure 4).

[0040] Therefore, the height between the small diameter pulley 13 and the folded guide groove 39 at this 17c portion is When the height difference becomes smaller and the boom is fully extended, the small diameter pulley 13 and Even if the distance with the folding guide 38 is reduced, the fleet angle A will not be as large as before. can be prevented from happening.

[0041] If the allowable fleet angle A is constant, the small diameter pulley 13 and the turning guide This means that the distance at which 38 can approach can be shortened.

[0042] Therefore, in a four-stage simultaneous telescoping boom section equipped with this kind of reduction synchronization device, must be secured between the first boom section 1 and the second boom section 2. The minimum overlap length L can be shortened compared to the conventional four-stage simultaneous extension of this type. The full extension length of the boom can be longer than the retracted boom section.

[0043] In the embodiment described above, the folding guide 38 is formed as a fixed component. Although the explanation is not limited to this, it is possible to use a pulley to raise the 17c side. It may be installed at an angle.

[0044] In addition, in the position adjustment device 34, both the large diameter pulley 12 and the small diameter pulley 13 are adjusted at the same time. Although the one that is moved at the time is shown, either one of the large diameter pulley 12 or the small diameter pulley 13 is shown. It may also be implemented in such a way that only one side is moved.

[0045] Furthermore, the present invention can be applied as is to a four-stage simultaneous telescopic boom, and Needless to say, it can be applied to a four-stage simultaneous telescopic boom part in a stage boom.

[0046]

[Effect of the idea]

As explained above, according to the invention recited in claim 1, this type of four-stage simultaneous telescopic The folding guide groove of the wire rope folding guide on the first boom section The large-diameter pulley side of the tip pulley is positioned low, and the small-diameter pulley side is positioned high.

[0047] Therefore, the wire that passes between the folding guide and the small-diameter pulley with a short distance This section allows you to reduce the slope of the rope when the boom is fully extended. The size of the fleet angle of the wire rope becomes smaller in minutes.

[0048] In addition, wire ropes that pass between a large diameter pulley with a long distance between the folding guide and the The slope of the boom is larger than before, but the gap distance is large, so the boom cannot be fully extended. In this case, the fleet angle of the wire rope in this part will not become excessive.

[0049] Therefore, if the size of the allowable fleet angle is constant, the folding guide and the small The distance between the diameter pulley and the pulley can be made shorter than before.

[0050] Therefore, the wire rope in the part between the small diameter pulley of the tip pulley and the folding guide without excessively increasing the fleet angle of the first boom section and the second boom section. By shortening the overlap length with the boom, the full extension length of the boom can be increased accordingly. Ru.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of a reduction tuning device in an embodiment.

FIG. 2 is a top view of the distal pulley in the example.

FIG. 3 is a schematic diagram illustrating the arrangement of a folding guide with respect to the distal pulley in the embodiment.

4 is a front view of the folding guide tool as viewed from arrow C in FIG. 1. FIG.

FIG. 5 is an overall schematic top view of a conventional four-stage simultaneous telescopic boom portion.

6 is a sectional view taken along line XX in FIG. 5. FIG.

FIG. 7 is a top view of a conventional folding guide.

FIG. 8 is a rear view of a conventional folding guide.

FIG. 9 is a side view of a conventional folding guide.

[Explanation of symbols]

1 1st boom section 2 2nd boom section 3 3rd boom section 4 4th boom section 5 Hydraulic cylinder 6 wire rope 7 Pulley 8 wire rope 9 Pulley 12 Large diameter pulley 13 Small diameter pulley 15 Base end pulley 16 Base end pulley 17 Wire rope 31 Tip pulley 38 Folding guide 39 Turning guide groove

Claims (1)

[Scope of utility model registration request] Claim 1: The second, third, and fourth boom sections on the distal end are telescopically inserted into the first boom section on the proximal end in order, and a hydraulic cylinder is installed between the first boom section and the second boom section. At the same time, the expansion and contraction displacement of the second boom section relative to the first boom section by this hydraulic cylinder is controlled by an extension tuning device and a contraction tuning device configured using a pulley and a wire rope. A four-stage simultaneous telescopic boom section that transmits transmission to the boom section, and the reduction synchronization device includes a wire rope having both ends fixed to both sides of the fourth boom section, and a wire rope attached to both inside sides of the base end of the second boom section. The pair of left and right second boom section proximal pulleys are placed between the second boom section base end pulleys and the upper plate of the second boom section at the center of the tip of the first boom section, with their rotating surfaces approximately parallel to the upper plate of the second boom section. A first boom section tip pulley configured by arranging a large diameter pulley and a small diameter pulley in order from the tip side of the first boom section in the axial direction of the boom, and on the upper plate of the base end of the second boom section. a wire rope folding guide having a wire rope folding guide groove attached to a position on the proximal end side of the distal end pulley of the first boom section; After passing through one of the proximal pulleys of the second boom section disposed on the same side as the anchoring end, the wire rope is connected to the small diameter pulley of the distal end pulley of the first boom section, folding guide,
In the contraction synchronization device for a four-stage simultaneous telescopic boom portion, which is made to pass in the order of the large diameter pulley of the first boom section tip pulley, and then reach the other fixed end via the other second boom section base end pulley. , positioning the large diameter pulley side of the folding guide groove of the wire rope folding guide at a low position so that the wire rope passing between the folding guide and the large diameter pulley of the first boom section tip pulley is in an inclined state; At the same time, the small-diameter pulley side of the turn-back guide groove is positioned high so that the wire rope passing between the small-diameter pulley of the first boom section tip pulley and the turn-back guide is in a substantially horizontal state. A reduction synchronization device for a four-stage simultaneous telescopic boom portion, which is characterized by being arranged at an angle.