JPH0317968B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic excavator equipped with a crane device.

After excavating with a hydraulic excavator, shoring, water pipes, etc. may be buried in the excavated area. At that time, the hydraulic excavator may be used as a crane to move these water pipes and shoring located elsewhere to the burial site. For this reason, a crane device is attached to the arm of a hydraulic excavator so that these objects can be suspended and moved. For example, as shown in Figure 1, a winch for a crane is built into the arm of a hydraulic excavator, a sheep is attached near the front of the arm, a wire rope is stretched from the winch through the sheep, and the tip of the You can also hang a crane hook from the top of the hydraulic excavator to enable crane work, or attach a crane winch to the base of the boom of the hydraulic excavator and run a wire rope from the winch to the sheave at the connection between the boom and the arm, and the sheave at the front of the arm. A crane hook can be hung from the end of the crane to enable crane work in the same way as described above, or alternatively,
A method of attaching a crane hook to the back of the excavation bucket of a hydraulic excavator has been used.

However, when trying to move suspended water pipes, shoring, etc. horizontally, all of these methods
When the boom is rotated, the trajectory of the hook becomes an arc, and as shown in Figure 1, the hook moves along the curve a, and when it moves horizontally by l,
It also moves by L in the vertical direction, and the ratio of L/l is very large, and almost the same difficulty occurs when rotating the arm and moving the hook position back and forth. In order to horizontally move an object suspended by a crane device having a boom and an arm, the boom and arm must be rotated by an appropriate amount at the same time, making the operation of the crane device very difficult. Furthermore, since these suspended objects are heavy, it is difficult to manually adjust their positions. Therefore, it has been desired to develop a crane device that can move horizontally without vertical movement when moving water pipes, shoring, etc. using a hydraulic excavator.

The purpose of this invention is to provide a device that satisfies the above-mentioned needs, and is capable of horizontally moving suspended objects without vertical movement when a hydraulic excavator is used for crane work. .

The structure of the present invention is such that a longitudinal rail is attached to the lower side of the arm of a hydraulic excavator, a crane device support body having rollers is placed on the rail, and this can be moved back and forth by the hydraulic excavator or other drive device. At the same time, a crane device such as a chain block or a winch is suspended from the crane device support.

By supporting the arm so that the rail is horizontal and moving the crane device support back and forth, the suspended object will move horizontally, which is very convenient for installing water pipes and shoring.

The embodiments of the present invention will now be described in detail with reference to the drawings.

Reference numeral 1 denotes an arm of a hydraulic excavator, and a rail 2 of considerable length is fixed to the underside of the arm 1 from the front to the rear. The rail 2 supports the crane device support 3, and has an L-shaped cross section as shown in FIG. are doing. Upper and lower 1 are provided on both left and right sides of the crane device support 3.
Pairs of rollers 4 are pivotally connected, two at the front and two at the front, and the crane device support 3 is located between the left and right rails 2, and a pair of upper and lower rollers 4 pivotally attached to both sides sandwich the rail 2. It is placed on rail 2 in this condition. A bracket 5 is provided protruding from the upper part of the crane device support 3, and a hydraulic shovel 6 is provided between the bracket 5 and the rear part of the arm 1, and the hydraulic cylinder 6 is actuated to move the crane device support 3 back and forth. You can move to Reference numeral 7 denotes a crane device, which consists of a chain block 8, a chain 9, and a hook 10 attached to the lower end of the chain block 8. A hook 11 attached to the upper part of the chain block 8 is used to pull the crane device to a hook 12 attached to the lower part of the crane device support 3. The crane device 7 is suspended from the crane device support 3. In addition, 13 is the hydraulic excavator body, 14 is the boom, 1
5 is a boom cylinder, 16 is an arm cylinder, 1
7 is a bucket, and 18 is a bucket cylinder.

The present invention is configured as described above, and there are cases where it is necessary to move these objects horizontally during crane work, especially when installing shoring or water pipes in excavated trenches. operates the boom cylinder 15 and the arm slider 16 to hold the arm 1, that is, the rail 2 attached to its lower part, horizontally. chain block 8
When the operator operates the hook 10 to suspend the cargo handling object and operates the hydraulic cylinder 6, the crane device support 3 that supports the crane device 7 moves horizontally along the rail 2, so that the suspended cargo object is also suspended. Move horizontally.

When used as a normal crane, by operating the hydraulic cylinder 6 and holding it in a fixed position on the crane device support 3, cargo handling can be performed by operating the chain block 8, or the boom cylinder 15 and arm cylinder 16. Cargo handling can be carried out in the same way as with a normal crane.

When performing excavation work as a hydraulic excavator, remove the crane device 7 from the crane device support 3, contract the hydraulic cylinder 6, and move the crane device support 3 backward, then the crane device support 3 can be used for excavation work. The arm 1 can be operated and excavated in exactly the same way as a normal arm.

6 and 7 show other embodiments of the present invention. In the case of FIG. 6, the crane device support 19 is operated by a hydraulic motor 20 instead of a hydraulic cylinder, and the arm 1 is operated by a hydraulic motor 20 instead of a hydraulic cylinder. A rack 21 is mounted parallel to the rail 2, and a pinion 22 of a hydraulic motor 20 mounted on a crane device support 19 meshes with the rack 21. hydraulic motor 2
0 and the pinion 22 drives the rack 21, the crane device support 19 can be moved back and forth, and the operating situation is almost the same as when using a hydraulic cylinder.

In the case of FIG. 7, a load cell 24 is attached to the crane device support 23 instead of the crane device 7 having the chain block 8, which is convenient because it is possible to measure not only the crane operation but also the weight of the cargo to be handled.

As described above, in the present invention, a rail is attached to the lower part of the arm of a hydraulic excavator, and the crane device support on which the crane device is suspended can be moved back and forth by a hydraulic cylinder or other means. Therefore, if you hold the arm so that the rail is horizontal, you can move the cargo horizontally.
Alternatively, it is very convenient when installing shoring. In addition, chain blocks, winches, load cells, etc. can be freely attached to the crane device support, so the range of applications is wide. Further, during normal excavation work, if the crane device is removed and the crane device support is moved rearward, there will be no hindrance to the excavation work, and the crane work and excavation work can be used together, which is extremely useful.

[Brief explanation of the drawing]

Fig. 1 is a front view of the conventional one, Fig. 2 is a front view of the embodiment of the present invention, Fig. 3 is a front view of the present invention actually installed, and Fig. 4 is A-A in Fig. 2. A sectional view, FIG. 5 is a front view during excavation work of the present invention, and FIG.
7 is a front view of another embodiment of the present invention, and FIG. 8 is a front view of another embodiment of the present invention.
The figure is a sectional view taken along line BB in FIG. DESCRIPTION OF SYMBOLS 1... Arm, 2... Rail, 3... Crane device support, 6... Hydraulic cylinder, 7... Crane device, 14... Boom.

Claims (1)

[Claims] 1 A boom is mounted on a revolving structure, an arm is pivoted at the tip of the boom so that it can rotate up and down, a rail is fixed to the underside of the arm, the rail is clamped from above and below, and the arm is movable. A crane device for a hydraulic excavator, characterized in that a support is placed thereon, a moving drive device is provided between the support and the arm, and a crane device is detachably attached to the support.