JPH0940359A - Hydraulic opening/closing device of cargo handling device such as grapple - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect hydraulic pipings and cylinder rods, by installing the tube of a switching hydraulic cylinder to a grip side, and a cylinder rod to the installing base side of the grip respectively, and providing a hydraulic passage to the tube, in the cylinder rod. SOLUTION: The tube 4 of an opening/closing hydraulic cylinder 3 is installed to a grip 1 side, while a cylinder head 5 is installed to a grip installing base 2 side. And a hydraulic passage 6 to the tube 4 is provided in the cylinder rod 5. A rod cover 7 is inserted over cylinder rod 5. Each hydraulic passage 6 has a port 8 at the rotary shaft side of the cylinder head 5, and the ports 8 are connected to a collecting port near the installing base 2 through hoses. The pressure is applied to the collecting port from a power shovel or the like, so as to form a grasping condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a hydraulic opening / closing device in a cargo handling device in which a plurality of gripping claws can be opened and closed in a gripping direction by a hydraulic cylinder represented by a grapple.

[0002]

2. Description of the Related Art Conventionally, in grapples, hydraulic polyp type buckets and the like, a tube (cylinder) of a hydraulic cylinder is attached to a base side and a cylinder rod is attached to a grip side so that the grip can be opened and closed.

[0003]

In the conventional hydraulic opening / closing structure for a grapple or the like, the cylinder mounted on the base side is easily damaged because the rod connected to the cylinder is exposed. There is a pipe for introducing oil before and after, and a case for protecting it is also necessary, and this case has a special shape that covers the projection of the pipe, and it may be deformed by the operation of a grapple or the like. Often hurt. In addition, the pipe exposed to the outside interferes with other things at the time of work, causing a failure. Although it is different from all grips and buckets such as grips that open and close, the cylinder tube when opening and closing the movable pawl with respect to the fixed pawl for the purpose of protecting the tube in the small crusher is The structure arranged on the movable claw side was previously proposed in Japanese Patent Application No. 6-4216.

[0004]

A hydraulic opening / closing device of a cargo handling device such as a grapple according to the present invention is a grapple or the like in which a plurality of grips are rotatably attached to an attachment base and the grips can be opened and closed by an opening / closing hydraulic cylinder. In the cargo handling device, attach the tube of the opening / closing hydraulic cylinder to the grip side and the cylinder rod to the grip mounting base side.
A hydraulic path to the tube is provided in the cylinder rod. The grip here is the most common form of gripping claw, but it is not only a pointed grip required for gripping, but also a bucket structure that temporarily stores various items inside by closing multiple grips. Including those.
The device of the present invention can be applied to a plurality of gripping claws such as two claws suitable for wood to four claws suitable for scrap.

[0005]

1 and 2 show an example in which the present invention is applied to a grapple. In the case of a grapple, the grip 1 is a claw with a pointed tip, but the bucket is a flat one that enables gripping of an article, and a plurality of grips can be freely rotated with respect to the mounting base 2. The structure is similar in that the grip can be opened and closed by mounting and opening / closing hydraulic cylinders. In any of these examples, in the present invention, the tube 4 of the opening / closing hydraulic cylinder 3 is attached to the grip 1 side, and the cylinder rod 5 is attached to the grip mounting base 2 side. A hydraulic path 6 to the tube is provided inside the cylinder rod 5. The cylinder rod 5 has a rod cover 7 externally inserted, but this does not have a modified cross-section like the conventional cylinder cover, but only a cylinder is externally inserted.

The hydraulic path has a port 8 on the side of the rotation axis of the cylinder rod 5, and each port is connected to a collecting port 9 near the mounting base 2 by a hose, and is added to this collecting port 9 when a power shovel or the like is closed. Pressure is applied and the gripped state of FIG. 2 is obtained. In this example, two grips are shown on the left and right, but two grips are provided on the front and rear, or the entire circumference of the opening height is divided into three positions. A grip can be provided.

[0007]

[Embodiment] The full swing type orange bucket shown in FIGS. 1 and 2 has a total length of about 23 from the hook mounting shaft core to the grip tip.
The hydraulic opening / closing device of the present invention was attached to the one having a total opening diameter of 2300 mmφ and a total weight of 1150 kg of 00 mm. The illustration omits the front and back claws.

FIG. 3 shows the piping condition of the hydraulic hose in the swivel mounting base portion. Although the piping from the rotator 10 to the grip mounting base below the rotator 10 is the same as the conventional one, the ports 9 of the mounting base 2 are connected to each other. The piping to the cylinder is extremely short as shown in the figure, and the mounting shaft of the cylinder rod 5
The distance to the root port 8 of the above is sufficient, and moreover, it is accommodated in the inside of the mounting base 2, and it is not necessary to provide long piping to the port of the outer cylinder tube as in the conventional case. As a result, the total pipe length is 1 grapple
Savings of 15m per base.

The present invention can be applied not only to a wood grapple having two other grips, but also to a cargo handling machine such as a cylinder opening / closing grapple or a bucket.

[0010]

According to the present invention, the hydraulic pipe and the cylinder rod are protected, and the durability of the device is improved.
It is possible to improve work efficiency by avoiding breakdown during work. In addition, even if the condition of use is rough, it does not break down.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a grapple provided with a hydraulic opening / closing device of the present invention when a grip is opened.

FIG. 2 is a partially cutaway front view of a grapple including the hydraulic opening / closing device when a grip is closed.

FIG. 3 is a cross-sectional view showing a piping state of a hydraulic hose in a swivel mounting base portion.

[Explanation of symbols]

 1 Grip 2 Mounting base 3 Opening / closing hydraulic cylinder 4 Tube 5 Cylinder rod 6 Hydraulic path 7 Rod cover 8 Port 9 Assembly port 10 Rotator 12 Mounting shaft

Claims (1)

[Claims] 1. A cargo handling device such as a grapple in which a plurality of grips are rotatably attached to a mounting base and the grips can be opened and closed by an opening and closing hydraulic cylinder, and a tube of the opening and closing hydraulic cylinder is on the grip side and a cylinder rod. Is attached to the grip mounting base side, and the hydraulic path to the tube is provided in the cylinder rod.