FI83069C - Device for power supply lines in connection with telescopic arms - Google Patents

Description

1 83069

Specification for telescopic booms in connection with power supply lines

The present invention relates to an arrangement in particular for telescopic booms fitted with cranes or the like. The arrangement comprises three telescopically displaceable parts, an outer part, a central part and an inner part, and one or more lines for transmitting hydraulic, compressed air and / or electric power from the outer part to the inner part.

Cranes of considerable reach are often required for loading and unloading work. In order to be able to carry out lifting work both near and far, crane booms are now commonly used, which are, for example, of the simple folding-boom type. However, if necessary, large boom lengths require free space upwards to give space to my folding brother when the boom is folded for close-up work. Free; space up is not always available e.g. due to the fact that the surrounding objects and obstacles located at high altitudes may be damaged. Folding with high folding boom joint. . ' for example, a boom crane cannot be used on a forest sparse dummy, as such a boom structure would cause unacceptable • frame damage to the remaining trees. In this case, it is preferred to use said telescopic type crane boom with several telescopic steps. In order to carry out the intermediate work, the various telescopic steps must not be particularly long, especially in a forest machine, where the telescopic parts must not protrude backwards due to the risk of impact damage to nearby trees. However, in order to achieve a large dimension, several telescopic steps must be used.

: ·· In practice, however, there are problems with crane booms of the latter type which are difficult to solve. Apart from the problem of torsional stiffness, in which case the distance between the telescopic steps must be limited by both the distance and the axial, and the problem of overcoming the resting friction of the plain bearings when the boom is extended, the friction depends very much on the , how, for example, hydraulic force, compressed air and / or electric force is conducted from the outer part to the inner part. With regard to the latter problem, SU-548 544 provides a solution. The line is arranged to run from a fixed point on the outer part, between the outer and central part through the swivel wheel and between the central and inner part to a fixed point on the inner part. In this way, the line follows the movements of the three-part boom. However, it is very difficult to keep the outer dimensions of the arm small and to maintain as much space as possible for the various wires required.

The present invention provides a solution to the problems discussed above and thus an improvement in the arrangement for transmitting hydraulic power, compressed air and / or electric power. The invention is characterized in that the central part, when formed of two parts, is preferably shaped so that the parts have different radii of curvature, one part being closer to the inner tube and the other part closer to the outer tube, 'a larger space is created for said wires.

Embodiments of the invention will be explained in more detail with reference to the accompanying drawings.

Fig. 1 shows the telescopic boom in partial section and seen from two mutually rectangular directions, Fig. 2 shows on an enlarged scale, as in Fig. 1, the bearings marked in the latter figure, * Fig. 3 is a cross-section through the telescopic boom in the assembled position, 3 cross-sections through a telescopic boom in a collapsed position, the boom having three bearing discs spaced apart at an angle of o 120, Fig. 5 is a partial sectional view of two telescopic working positions of a telescopic boom system as well as the telescopic boom in two different working positions.

The telescopic boom 1 shown consists of three tubular parts 2, 3 and 4 which are telescopically movable with each other and have a circular cross-section. The outer tube 2 is arranged to surround the central tube 3, which in turn is arranged to surround the sieve tube 4. The central tube 3 consists of two tube halves 3a, 3b, each of which has an opposite edge 3c welded to two I-beam rails 5, each forming two gutters 5a, 5b. which are turned inwards and outwards, respectively, in the central tube thus assembled,; see Fig. 3. Similarly, in one embodiment: there are slots arranged in the end portions of the outer and inner tubes, respectively; 2a, 4a, additional rails 6 and 7, respectively. The latter. the discs here extend only to those required for the steering bearing; from the facing ends of the outer tube 2 and the inner tube 4 ', respectively.

Holes 6a are formed in the rails 6 for bearing pins 8, which are fastened to the holes with a lock adapter. The rollers 10 are rotatably mounted on the free ends 9 of the pins 8, so that the circumferences 10a of the rollers 10 are arranged in tight rotational contact with the flanges 5c of the u-troughs 5, cf. Fig. 3. The rollers 10 are fastened axially with screws 11 by means of plates 12 which at the same time form a plain bearing:. with the outwardly turned troughs of the outer tube 2 and the central tube 3 on the one hand and the inwardly turned troughs 5 of the inner tube 4 and the middle tube on the other hand, so that the sliding bearings t work together with the surfaces 5d of the trough-like tracks 5a, 5b at a substantially right angle against the surfaces 5c with which the running members 10 cooperate.

As shown in Fig. 4, instead of two diametrically arranged roller bearings and a plain bearing system, three such can be arranged so that their mutual angle distribution is 120 and they are arranged parallel along the central tube 3. Thanks to this arrangement, both the rollers and the plain bearings efficiently absorb all bending loads, whatever they apply in any direction to the telescopic boom 1. In this example, the plain bearing function of the plates 12 is only secondary and the main function of the plates is therefore axially fixed at the free ends of the pins. however, it is connected to each other completely non-rotatably, and the structure is shape-rigid.

Here again, one or more of the tubes 2, 3 and 4 may consist of a number of parts similar to those previously described in connection with Figure 3 *.

In order to obtain a similar telescopic mutual movement of the telescopic parts 2, 3 and 4 with respect to each other, the guide is arranged by means of a roller chain 13, as shown in Fig. 5. As can be seen from the figure, the other end 13a of the roller chain 13 in the maximally protruding position is fixed to the bracket 14 on the other side of the inner tube 4 immediately outside the outer end of the central tube 3. The roller chain 13 then, as can be seen, passes into a free space 25 between the inner tube 4 and the central pain tube 3. At one end of the central tube 3, a folding wheel 15 is rotatably mounted on a bracket 16 fixedly attached to said end of the central tube 3. The roller chain 13 passes around the deflection wheel 15 and then continues to the free space 26 between the outer tube 2 and the central tube 3. The roller chain 13 is fixedly attached to the fastener 17 at the end of the outer tube 2 but then runs freely to the deflection wheel. 18 a roller which is mounted on the free end of the rotary wheel 3. The roller chain 13 then passes around the deflection wheel 18 and is finally fixed at one end 13b to a bracket 19 fixed to the side of the inner tube 4 diametrically opposite the bracket 14.

Examining the relative movements of the various parts, it can be seen that when the inner tube 4 is moved inwards, the bracket 19 is pulled with it by the deflection wheel 18 of the roller chain 13. In this case, the roller chain 13 pulls the outer tube 2 inwards by means of the fastener 17, so that the outer tube 2 and the inner tube 4 meet each other at the same speed. Conversely, when the telescopic boom has to be pulled out, the bracket 14 pulls the roller chain 13 with it through the deflection wheel, whereby the roller chain 13 pulls out the outer boom 2 through the fastener 17 at the same rate as the inner tube 4 moves in the opposite direction. The telescopic parts 2, 3 and 4 are driven by a hydraulic cylinder (not shown) between the two telescopic parts, the third of which is accompanied by a roller chain arrangement. Instead of a roller chain, a steel rope or the like can also be used as the guide member.

For example, a system according to Figure 6 is used to transmit hydraulic power, compressed air and / or electric power via lines from one end of the telescopic boom to the other. From the source "A" one or more tubes 20 leave up to a switch 21 which is attached to the end of the outer tube 2 te. to point 17 as shown in Figure 5. From the coupling 21, the hoses 22 then pass through the free space between the outer tube 2: and the central tube 3 on the path of the roller chain, after which they pass around the folding wheel 15 described above and further to the coupling 23 on the underside of the inner tube 4. Pipe 24 continues from here, for example, to the implement at point "B".

6 83069

The telescopic parts 2, 3 and 4 are. as explained above, coercively controlled with respect to each other. This causes that when the central tube 3 moves inside the outer tube 2, the deflection wheel 15 is caused to move and keep the hydraulic lines 22 straight, whereby the ends of the lines at the switch 23 move inwards at twice the speed of the deflection wheel 15. Pneumatic lines and electric cables can also be arranged in the same way. The electric cables can be arranged parallel to the hydraulic lines, so that they act, for example, as control cables for electrically controlled hydraulic valves.

In order to obtain as much space as possible for the hydraulic line, the pneumatic line, the electric line, etc. and the smallest possible external dimensions of the telescopic arm, a central part is formed, preferably consisting of three or two zones, so that the sub-zones 3a, 3b have different bending radii. Thus, the sub-zone 3a will be closer to the inner tube 4 and the sub-zone 3b closer to the outer tube 2. This will give an optimal state for said lines. The zones of the pipe can be made by bending a rolled thick plate.

; In addition to the example shown with three telescopic parts, a larger number of parts can be used if necessary, since there is no risk of harmful play or frictional resistance. Instead of the circular cross-section shown in the boom, the cross-section of the boom may be oval, triangular, quadrangular or in various ways polygonal.

Claims (2)

7 83069 1. An arrangement, in particular for telescopic booms for use with hoists and the like, comprising three telescopically movable parts, an outer part, a central part and an inner part, and one or more lines for transmitting hydraulic power, compressed air and / or electric power <AB, Fig. 6>, external ooaeta (2) to the inner part <4), the wires being adapted to follow the chain (13) or the like from a fixed point (21) in the outer part (2), between the outer part (2) and the central part (3) of the first deflection wheel (15) above and between the central part (3) and the inner part (4>) to the latter fixed point (23) and further to the device (B>), characterized in that the central part, preferably consisting of two parts, is shaped so that the parts (3a, 3b) have different radii of curvature, one part (3a) being closer to the inner tube (4) and the other part (3b) being closer to the outer tube (2), (^, 26).: '^ 1. Anordning vid teleskoparmar särskilt i samband med lyft- * kranar och liknande omfattande tre i varandra teleskopiskt förskjutbara delar, en ytterdel, en mellandel samt en inre del, och en eller flera ledningar for overflow (AB, fig. - - 6) av hydraulkraft, tryckluft och / eller Elkraft frän ytterdel! (2) to the inner part (4), the color of the lead is not anchored in the upper part (13) or to the left of the fast point (21) 15) och mellan mellandelen (3) och in-nerdelen (4) account en fast punkt (23) head system and video account (b), kännetecknad av att mellandelen,:; the best of the above-mentioned deletions, which may have been used as a cross-linker (3a, 3b), may have been used as a cross-linker; 2), varvid större utrymme (25, 26) skapas för *: ** nämnda ledningar.