KR20020025528A - Outrigger of crane - Google Patents

Abstract

PURPOSE: An outrigger of a crane is provided to reduce the cost for manufacturing components by compacting structure of a hydraulic cylinder and an outrigger beam and to improve reliability by restraining the bending of a cylinder. CONSTITUTION: An outrigger of a crane comprises a base beam protruded onto each side of a crane body, two-stage outrigger beams installed on the end of the base beam in the extendable structure and equipped with extendable cylinders(30), a sliding unit(40) installed on each side of the second and first outrigger beams, and a jack cylinder(20) installed toward the ground. When not in use, the outrigger beams are folded. Therefore, the width of the crane is reduced.

Description

Outrigger of crane

The present invention relates to an outrigger device of a crane, and more particularly, to an outrigger device of a crane to prevent the bending phenomenon while extending the length of the outrigger by embedding a two-stage expansion cylinder inside the outrigger beam.

In general, heavy equipment such as excavators, cranes or concrete pumping cars used in construction sites or civil engineering sites, in order to increase the stability of the heavy equipment itself in order to support or support heavy objects while performing its own work. Outriggers are installed on both sides.

This outrigger device is installed on both sides of the heavy equipment itself, and serves to maintain the horizontal state by preventing the heavy equipment is biased to either side when working with heavy equipment.

That is, a mobile crane such as a truck crane supports the crane itself by wheels during movement, but does not sufficiently support the crane itself only by the wheels during crane work by the crane, and thus the outrigger device is required.

Conventionally, the outrigger device is typically provided in two places on the vehicle body of the heavy equipment, the structure is shown in Figure 1, the base beam 15 is installed to protrude on both sides of the heavy-duty vehicle body, and the base beam ( Outrigger beams 12 and 14, which are elastically installed at the ends of 15, and jack cylinders 20 which are installed toward the ground in a direction perpendicular to the outrigger beam 14 at the tip of the outrigger beam 14; Is made of.

And the cylinder 30 which expands and contracts the outrigger beams 12 and 14 to both outer sides is provided in the outer side spaced | separated from a suitable distance.

The conventional outrigger device having such a structure may be damaged during external shock transmission because the cylinder is exposed to the outside, and the bending phenomenon of the cylinder 30 occurs due to the distance from the outrigger beams 12 and 14. There was this.

In addition, there is a disadvantage in that the mounting width of the crane is increased due to the external exposure of the cylinder, and the foreign matter easily penetrated.

An example of a conventional outrigger device is disclosed in Korean Utility Model Publication No. 90-4110, "lateral movement device of a vehicle crane," and is arranged in the body frame 3 to extend in the vehicle width direction, as shown in FIG. At least one rear outrigger beam (1) having a pair of outrigger beams (5, 6) installed in close proximity to each other while being stretched inside the designed outrigger box (4) in the vehicle width direction and installed in the outrigger beam ( In a transverse movement device of a vehicle crane provided with jacky 8, 9 for lifting a vehicle body at the vehicle width direction outer end of 5, 6, a pair of telescopic operation of the outrigger beams 5, 6 in the vehicle width direction is performed. A roller 4 which abuts the protruding cylinder 7 on the inner lower surface of the outrigger box 4 is installed at the vehicle widthwise inner end of the outrigger beams 5 and 6 and the upper surface of the outrigger beams 5 and 6. Roller (4) abuts against the outrigger box (4) A pair of the vehicle body which is mounted on the vehicle body side angle member near the upper end of the vehicle width direction and is lifted by Jackie (8, 9) while extending the lower side of the pair of outrigger beams (5, 6) and contracting the other side. The outrigger beams 5 and 6 are configured to expand and contract the inside of the outrigger box 4 via the rollers 11 and 14 when the protruding cylinders 7 are moved in the vehicle width direction by simultaneously stretching and contracting the protruding cylinders 7.

The conventional outrigger device having such a configuration has the advantage of greatly improving the outrigger beam in the lateral direction by using a cylinder and a roller, but is actually used differently from the purpose used in a hydraulic crane and protrudes in a lateral direction. The disadvantage is that the length is limited by the width of the equipment.

In addition, since the structure is complicated, there is a possibility that not only the manufacturing cost rises but also an assembly tolerance occurs.

The present invention has been made to solve the above problems in view of the above, the object is to expand the stretch distance of the outrigger beam with a simple structure, and to increase the draw width to the maximum within a limited range to improve the safety at work In order to reduce the bending of the cylinder to improve the reliability of the product to provide a crane outrigger device.

1 shows an outrigger device of a general crane,

Figure 1a is a plan view showing an outrigger device.

Figure 1b is a front view showing the outrigger device.

Figure 2 is a front view showing an outrigger device of the conventional crane.

3 is a cross-sectional view showing an outrigger device of the crane according to the present invention.

Explanation of symbols on the main parts of the drawings

12,14: 1st and 2nd outer trigger beam

15: base beam 20: jack cylinder

30: cylinder 40: sliding means

42: engaging portion 44,46: stopper

The present invention for achieving the above object is a base beam protruding from both sides of the crane body, at least one outrigger beam that is elastically assembled and interlocked to the base beam, and at the tip of the outrigger beam In the outrigger device of a crane consisting of a jack cylinder installed toward the ground in a direction perpendicular to the outrigger beam,

At least two stages of flexible cylinders are installed inside the outrigger beam,

The rod of the cylinder is axially coupled to the end of the outrigger beam,

The outrigger beams are slidably interlocked with each other by a stopper provided on the side surface.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3, the outrigger device for a crane according to the present invention has a base beam 15 protruding from both sides of a crane body, and a two-stage stretchable structure at an end portion of the base beam 15. Sliding means for sliding the two stage outrigger beams (12, 14) and the second outer trigger beam (14) and the first outer trigger beam (12), each of which has a built-in cylinder (30) installed therein; 40 and a jack cylinder 20 provided toward the ground in a direction perpendicular to the second outrigger beam 14 at the tip of the second outrigger beam 14.

The sliding means 40 is a stopper 42 is formed on the outer surface of the second outer trigger beam 14, the stopper (interfering with the locking portion 42 on both ends of the inner surface of the first outer trigger beam 12 ( 44,46).

That is, the locking portion 42 is positioned between both ends of the first outrigger beam 12 and has a structure that interferes with one of the stoppers 44 and 46 during the stretching operation of the second outrigger beam 14.

The cylinder 30 preferably employs a conventional hydraulic cylinder, with the exception of pneumatic or otherwise.

In addition, the cylinder 30 may further extend the width by adopting a plurality of multi-stage telescoping instead of two-stage telescoping according to the type of crane work, and is not double-acting, but instead of each double outrigger beam (12, 14) Can be installed at each end.

That is, the cylinder 30 has a structure that is horizontally installed in the width direction in the interior of the outrigger beams (12, 14).

Reference numeral 25 denotes a fixed shaft 25 in which the end of the second outer trigger beam 14 and the rod end of the cylinder 30 are axially coupled.

Hereinafter, the operation of the present invention will be described.

When the hydraulic pressure is supplied to the inside of the cylinder 30, the rod of the cylinder 30 extends outward to extend the second outrigger beam 14 to the outside.

Since the rod of the cylinder 30 is axially coupled by the fixed shaft 25, the second outer trigger beam 14 is interlocked with the first outer trigger beam 12 while being moved outwards when the rod moves. The engaging portion 42 of the second outrigger beam 14 is caught while contacting the stopper 44 formed at one end of the first outrigger beam 12.

Therefore, the second outrigger beam 14 extends outward by a predetermined distance and then has an operation process of attracting the first outrigger beam 12 and extending outward.

Subsequently, the operator extends the outrigger beams 12 and 14 to a desired position and then operates the jack cylinder 20 downward to abut the ground.

The operator can carry out the crane work after supporting the crane with the outrigger device. On the other hand, after the crane operation is completed, if the hydraulic pressure is supplied to the inside of the cylinder 30 in the opposite direction to reverse the rod of the cylinder 30, the locking portion 42 of the second outrigger beam 14 becomes the first outrigger. Since the slide 12 interferes with the stopper 46 of the beam 12, the first and second outer trigger beams 12 and 14 are contracted to their original positions, thereby reducing the width of the crane.

As described above, the present invention is to install a multi-stage stretchable hydraulic cylinder for stretching the outrigger beam in the interior of the outrigger beam, according to the present invention is a simple structure in which the hydraulic cylinder is mounted inside the outrigger beam Therefore, the manufacturing cost of parts can be reduced, and the bending phenomenon of the cylinder can be suppressed, thereby improving the reliability of the product.

Claims (3)

A base beam 15 protruding from both sides of the crane vehicle body, at least one first and second outer trigger beams 12 and 14 that are elastically assembled to and interlocked with the base beam 15, and the outer beam In the outrigger device of the crane consisting of a jack cylinder 20 installed toward the ground in a direction perpendicular to the outrigger beam 14 at the tip of the trigger beam 14, At least two stages of flexible cylinders 30 are installed inside the first and second outer trigger beams 12 and 14, The rod of the cylinder 30 is axially coupled to the end of the second outrigger beam 14, The first outrigger beam (12) and the second outrigger beam 14 is an outrigger device of the crane, characterized in that the interlocking structure by the sliding means 40 provided on each side. The crane outrigger device according to claim 1, wherein the cylinder (30) is a hydraulic cylinder operated by hydraulic pressure. The method of claim 1 or 2, wherein the sliding means 40 has a locking portion 42 is formed on the outer surface of the second outer trigger beam 14, The outrigger device of the crane, characterized in that the stopper (44,46) is interfered with the locking portion (42) formed on both inner sides of the first outer trigger beam (12), respectively.