JPH07243568A - Pipe joint for hydraulic pipeline - Google Patents

Abstract

PURPOSE: To improve a defect of failing to move a hydraulic actuator into a correct position due to an error between the request flow and discharge flow of a hydraulic pump in control of a hydraulic machine. CONSTITUTION: An inclined rotation angle of a swashplate is detected through an inclined rotation angle detecting means upon the input of the discharge request flow of hydraulic pumps, and the rotating speed of an engine 1 is read from a rotating speed detecting means to compute the actual discharge flow of the hydraulic pumps 2, 3 and to compute a hydraulic pump compensatory flow value for obtaining deviation between the discharge request flow and actual discharge flow of the hydraulic pumps, and hydraulic actuator deviation. This value is converted into a voltage signal to correct the discharge of the hydraulic pumps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pipe joint, and more particularly to a pipe joint that can be arbitrarily adjusted in angle when a hydraulic pipe requiring bending connection at a number of places is installed.

[0002]

2. Description of the Related Art Generally, hydraulic pressure is used as a power source in many industrial fields including heavy equipment because it has many advantages such that a large power can be easily obtained with a small power source. . On the other hand, due to the characteristics of hydraulic pressure, the hydraulic line inevitably has a bendable connecting portion, and the hydraulic pressure acting on the pipe during rotation of a hydraulic motor or the like is usually 200 kg / cm ² or higher. A large pressure is applied to the bent connecting portion.

As shown in FIG. 1, a conventional hydraulic pipe joint has a pipe joint for connecting pipes in a horizontal state as shown in FIG.
Depending on the state shown in (A) or the required bending angle, a 45 ° elbow (for (B)) and a 90 ° elbow (for (C)) are used. For bending joints that require other angles, there is a problem that a specially manufactured pipe joint is used and the manufacturing cost is significantly increased.

On the other hand, in addition to this, the pipe itself may be artificially bent, or the pipe may be cut to form a connecting connection portion having a predetermined angle and then welded. It is extremely long and has the drawback of reduced work efficiency.
Also, when high pressure oil is circulated in the pipeline,
There has been a problem that brittleness is exposed at the bent portion or the welded connection portion.

[0005]

As a known technique in the literature concerning a joint for adjusting the angle of a pipe, Japanese Utility Model Laid-Open No. 55-9.
No. 2984 and Japanese Utility Model Laid-Open No. 63-91787 are disclosed. They form a number of wrinkles on the pipe and obtain a connecting joint that can be bent at a certain angle due to the wrinkles, but this also exposes the fragility at the wrinkle site and allows the entire pipeline. Since the pressure cannot be increased, it is difficult to apply it to a hydraulic pipeline.

An object of the present invention, which has been made in consideration of the above-mentioned problems of the prior art, is to provide a pipe joint for a hydraulic pipe which allows bending connection of the hydraulic pipe at an arbitrary angle and does not cause a fragile portion. To do.

Another object of the present invention is to provide a pipe joint for a hydraulic pipeline having excellent workability by freely adjusting the connecting angle according to various installation conditions of the hydraulic line.

[0008]

In order to achieve the above-mentioned object, the present invention is a hydraulic pipe joint for connecting and connecting two hydraulic pipes so that they can be bent at a predetermined angle to each other. Connected to one of the two hydraulic lines,
A first connector having a curved portion formed on the inner surface of the other end, one end connected to another one of the two hydraulic pipes, and the other end formed to correspond to the shape of the curved portion. A second connector rotatably coupled to the bending portion,
Fixing means for fixing the position of the second connector with respect to the first connector in a state where the second connector is rotated by a predetermined angle.

A further preferred feature of the present invention is the above-mentioned first aspect.
A concave groove is formed in the curved portion of the connector, and an oil leakage preventing O-ring is inserted into the concave groove to secure a sealing between the first connector and the second connector.

[0010]

In the hydraulic pipe joint of the present invention constructed as described above, since the above-mentioned second connector is freely rotated with respect to the first connector, it can be adapted to various hydraulic line design conditions. It can also be effectively applied to angled bending connections,
Due to this, workability is remarkably improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Various embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 shows a cross section of a hydraulic pipe fitting according to an embodiment of the present invention in which two hydraulic layers 101 and 102 are directly connected to each other so as to be bent at a predetermined angle. The pipe joint is composed of a first connector 2 and a second connector 6, and one end of the first connector 2 has the two hydraulic pipes 1 described above.
The conduit connection portion 1 is formed so as to be connected to any one of 01 and 102, and the spherical curved portion 3 is formed on the inner surface of the other end portion. On the other hand, one end of the second connector 6 is formed with the conduit connection portion 8 so as to be connected to the remaining one of the two hydraulic layers 101 and 102 described above, and the other end thereof is formed into the curved portion described above. The second connector 6 is rotatably coupled to the first connector 2 because it is housed in the housing 3 and has a spherical shape corresponding to the shape of the curved portion 3.

A nut 7 is provided as a fixing means for fixing the position of the above-mentioned second connector 6 in a state of being rotated by a predetermined angle with respect to the first connector 2.
That is, one end of the nut 7 is brought into contact with the spherical end of the second connector 6 described above, and the other end is joined to the outer peripheral surface of the first connector 2. Preferably, the groove 5 is formed at a predetermined position on the curved portion 3 of the first connector 2 described above, and the O-ring 4 for preventing oil leakage is inserted into the groove 5,
Oil leakage at the connection between the first connector 2 and the second connector 6 is prevented.

4 (A), (B) and (C) show a modified example of the first connector 2 in the pipe joint according to the present invention, and FIG. 4 (A) shows a case where a hydraulic line is formed. , For connecting the block and the hydraulic line, and when the threaded portion of the block is tapered, the pipe line connecting portion 1 of the first connector 2 is tapered so as to be coupled correspondingly. It is a thing.

FIG. 4B shows that when the connecting portion of the hydraulic line connected to the first connector 2 is formed by bolts,
In order to deal with this, the nut portion 9 is attached to the pipe connection portion 1 described above.
Are formed. And in FIG.4 (C), the connection part of the hydraulic line is not screwed to the first connector 2,
They are connected by welding, and a cylindrical portion 10 is formed. In addition, a person having ordinary skill in the art will be able to carry out various modifications of the conduit connection portion 1 of the first connector 2 according to the design conditions of the hydraulic line.

Further, FIGS. 5A, 5B, 5C and 5D are shown.
5 shows a modification of the second connector 6 of the pipe joint according to the present invention. FIG. 5 (A) shows that the hydraulic line connecting screw portion 11 is provided in the pipe connecting portion 8 of the second connector 6 described above. FIG. 5 (B) shows that the pipe line connecting portion 8 is formed with a taper screw portion 12 so as to be coupled to the hydraulic line connecting portion when the hydraulic line connecting portion is taper screwed. Is. 5C shows a case where the hydraulic line connecting portion has a bolt shape, the female screw portion 13 is formed on the pipe line connecting portion 8 so as to correspond thereto.

On the other hand, the angle range of the second connector 6 which can be adjusted with respect to the first connector 2 is limited to within 180 ° at maximum, so that there is a desire to bend the hydraulic line at an angle larger than that. As shown in FIG. 5D, by bending the second connector 6 main body at a predetermined angle, the adjustment can be performed even at the aforementioned 180 °. Similarly, even if the main body of the first connector 2 is bent at a predetermined angle, the same result can be obtained.

As shown in FIG. 3, the hydraulic pipe fitting of the present invention constructed as described above is adjusted to an arbitrary angle α with respect to the first connector 2 and then screwed to the nut 7. When the first connector 2 is fastened, the inner curved portion 3 of the first connector 2 and the spherical end portion 16 of the second connector 6 come into contact with each other, and in this state, the first connector 2 is continuously connected. When the second connector 6 is fastened to the first connector 1, the spherical end 16 of the second connector 6 and the inner curved portion 17 of the nut 7 come into contact with each other, so that the second connector 6 may be coupled to the first connector 1 at a predetermined angle. You can do it.

[0019]

As described above, according to the present invention, two hydraulic pipes can be freely connected and contacted at an arbitrary angle according to various design conditions of the hydraulic line, and oil leakage at the connecting portion can be prevented. Can be prevented. After the connection, the nut holds the connected state firmly, so that damage due to pressure can be prevented.

[0020]

[Brief description of drawings]

1 (A), (B) and (C) are front views showing a conventional hydraulic pipe joint.

FIG. 2 is a coupling sectional view showing a pipe joint according to the present invention.

FIG. 3 is a view showing a use state of the pipe joint according to the present invention.

4A, 4B and 4C are front views showing various modifications of the first connector of the pipe joint according to the present invention.

5 (A), (B), (C) and (D) are front views showing various modifications of the second connector of the pipe joint according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline connection part 2 1st connector 3 Curved part 4 O ring 5 Recessed groove 6 2nd connector 7 Nut 8 Pipeline connection part

Claims (5)

[Claims] 1. A hydraulic pipe joint for connecting and connecting two hydraulic pipes to each other so that they can be bent at a predetermined angle, one end of which is connected to one of the two hydraulic pipes and the other end of which is connected. A first connector having a curved portion formed on the inner surface of the portion;
One end is connected to the other one of the two hydraulic pipes,
A second connector, the other end of which is formed to correspond to the shape of the curved portion and is rotatably coupled to the curved portion, and the second connector that is rotated by a predetermined angle. And a fixing means for fixing the position of the second connector with respect to the first connector. 2. The hydraulic pipeline according to claim 1, further comprising: an O-ring for preventing oil leakage which is formed in the curved portion of the first connector and is inserted into the groove. Pipe fittings. 3. The one end of the first connector and one of the hydraulic pipes are joined by one of welding and screwing. The pipe joint for a hydraulic line according to claim 1. 4. The one end of the second connector and the other one of the hydraulic pipes are joined to each other by one of welding and screwing. The pipe joint for a hydraulic line according to claim 1. 5. The hydraulic pipeline according to claim 1, wherein at least one of the first connector and the second connector is formed so as to be bent at a predetermined angle. Pipe fittings.