JPS6340712Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a male joint for hydraulic piping, which is mainly used for hydraulic piping for roll balance in a roll rolling mill.

Generally, in the roll balance device of a roll rolling mill in a steel mill, a quick fluid coupling that can be easily engaged and disconnected is installed in the hydraulic line, and a female joint is usually connected to the line on the oil pump side, and the female joint is connected on the side of the roll support cylinder. A male joint is connected to the pipe line to connect the two, and when the roll is replaced, the two are separated to prevent abnormally high pressure from being applied to the hydraulic pipe.

Conventionally, as the above-mentioned fluid coupling, the first
As shown in the figure, a self-sealing female joint A with a built-in closing valve v whose head is biased by a spring _{S 1 so} as to come into pressure contact with an annular valve seat A ₂ inside a cylindrical body A 1 is attached to the oil pump side. On the other hand, in the pipeline on the roll support silling side, there is a male joint B in which a rod a that pushes open the closing valve v in the female joint A is fixed inside the cylindrical body _B1 by a spider b. I try to use

By the way, this male joint B does not have a closing valve inside, so when the joint is separated, the pressure on the roll side is not held in the pipe line and the pipe line is maintained safely, but on the other hand, the internal hydraulic oil may leak out. When using the roll again, it is necessary to add hydraulic oil, which not only increases costs, but also causes the roll to drop due to the hydraulic oil leaking, which requires time and effort to adjust, reducing work efficiency.

Therefore, this invention was made to improve this drawback, and it is possible to prevent the internal fluid from flowing out of the roll support side pipeline when the joint is separated, and also to alleviate the generation of abnormal pressure and prevent damage to the pipeline. This provides a male joint with a

The embodiment will be explained with reference to the drawings.
In FIGS. 2 and 3, 1 is a cylindrical body of a male joint B, and the end on the piping connection side has a hexagonal nut shape with a female thread 1c on the inner surface, and from there, there are multiple steps toward the connecting end. An annular recess 1b for receiving a ball is formed in the middle, and the connecting end is bent inward to form a small diameter portion 1a.

A spitor 2 equipped with a guide tube 2a is disposed in the center of the inside, and is prevented from moving rearward (toward the piping side) by a retaining ring 3 attached to the inner surface of the cylindrical body 1. The rod portion 4a of the mushroom-shaped valve body 4 is slidably inserted into the cylinder 2a, and a retaining nut 5 is screwed onto the rear end (piping side), and the cylindrical portion of the head 4b is screwed into the cylinder 2a. The outer diameter is made equal to the inner diameter of the small diameter portion 1a of the main body, and an annular sealing material 6 is embedded in the outer periphery of the cylindrical portion.

Further, a holding spring 7 sufficient to support the normal hydraulic pressure in the roll side pipe is stretched between the spider 2 and the small diameter portion 1a of the main body, and between the spider 2 and the valve head 4b. A restoring spring 8 is disposed in the valve body, and when not in use as shown in FIG. The connecting end of the cylindrical body 1 is closed.

Therefore, in use, the male joint B is connected to the piping on the roll support cylinder side of the roll rolling mill through its female thread 1c, and the female joint B as shown in Fig. 1 is connected to the piping on the oil pump side. The socket _A3 of A is moved back against the spring force of the support spring _S2 , and the pressure on the coupling ball _A4 is released.
In this state, if the connecting end of the male joint B is fitted into the female joint A, the head 4a of the valve body 4 of the male joint B will come into contact with the head of the closing valve v in the female joint A, and they will be mutually connected. Pushing against each other and compressing spring 8 and S ₁ , they retreat,
Ball A ₄ of female joint A is in annular recess 1 on male joint B
Then, when socket _A3 is returned to its original position, both joints A and B are connected with the fluid passage open as shown in Fig. 4, and the required pressure is applied to the support cylinder of the rolling roll. Oil is supplied. At this time, the spider 2 in the male joint B is held in a fixed position by the retaining ring 3.

Thus, when it becomes necessary to replace the roll, the socket _A3 of the female joint A is moved back again, and
If the pressure on ball A ₄ is released and male joint B is pulled out, male joint B can be easily separated from female joint A. The valve body 4 immediately moves forward (toward the coupling side) due to the restoring force of the spring 8, and the cylindrical portion of the head 4b fits into the small diameter portion 1a of the main body again as shown in FIG. The side end is blocked, thereby preventing the fluid in the roll side pipe from flowing out.

If abnormal pressure occurs in the pipeline due to a mistake during roll replacement,
The pressure is applied to the rear end of the valve body rod 4a and the spider 2, and as shown in FIG.
At the same time, the valve body 4 moves to the joint end side, and the valve head 4b protrudes from the small diameter portion 1a of the main body, opening the joint end side, so that the internal fluid flows out to the outside and an abnormal increase in internal pressure is prevented. , damage to the pipeline is prevented.

Then, when the pressure fluid flows out to the outside and the internal fluid drops, the spider 2 and the valve body 4 return to their original positions as shown in FIG. 2 by the spring action of the holding spring 7, sealing the pipeline.

As described above, in this invention, a small diameter part is formed at the joining side end of the cylindrical body, a spider equipped with a guide tube is disposed in the inner center part so as to be movable only toward the joining side, and the guide tube has a rod. A valve body consisting of a part and a head is slidably inserted, and a spring strong enough to maintain the pressure in the normal pipe line is installed between the spider and the small diameter part of the main body. A restoring spring is installed between the valve head and the small diameter part of the main body when the valve head is not connected.
When separated from the female joint, the valve body immediately closes the connecting end and prevents the internal fluid from flowing out, reducing waste of hydraulic oil, making it economical and preventing a drop in operating efficiency. In addition, if an abnormality occurs in the pipe line during roll replacement work, the valve body protrudes from the cylindrical body and can prevent abnormal pressure rise, preventing damage to the pipe and preventing roll rolling. It is suitable for use in hydraulic piping for machine roll balance.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional side view of a conventionally known female joint and male joint. FIG. 2 is a half-sectional side view of an embodiment of this invention. Figure 3 is its left front view. FIG. 4 is a half-sectional side view when coupled with a female joint. FIG. 5 is a half-sectional side view in which the valve body protrudes due to abnormal pressure during separation. In the figure, 1... cylindrical main body, 1a... small diameter part, 1b
... Annular recess, 2 ... Spider, 2a ... Guide tube, 3 ... Retaining ring, 4 ... Valve body, 4a ... Rod portion,
4b... Head, 6... Seal material, 7... Holding spring, 8... Restoration spring.

Claims (1)

[Scope of utility model registration request] A small diameter portion 1a is formed at the joining side end of a cylindrical main body 1 having an annular recess 1b for receiving a ball in the middle of the outer surface, and a spider 2 having a guide tube 2a is connected to the inner central part of the cylindrical main body 1. A valve body 4 consisting of a rod portion 4a and a head portion 4b is slidably fitted into the guide tube 2a, and a valve body 4 consisting of a rod portion 4a and a head portion 4b is slidably inserted between the spider 2 and the small diameter portion 1a of the main body 1. A spring 7 strong enough to maintain normal pressure in the pipe line is disposed, and a restoring spring 8 is disposed between the spider 2 and the valve head 4b. A male joint for hydraulic piping, in which the small diameter portion 1a of the main body is closed by the portion 4b.