JPS5942174Y2 - Connection device for hydraulic pipe expansion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic pipe expansion connecting device particularly suitable for ultra-high pressure hydraulic pipe expansion.

Conventionally, when performing hydraulic pipe expansion, methods such as screw connections are conventionally used for lines (pressure intensifiers, terminal devices, etc.) through which ultra-high pressure liquid with a hydraulic pressure of 3,000 amperes or more passes, so it is difficult to connect or disconnect lines. It had the disadvantage that separation could not be performed arbitrarily.

On the other hand, many hydraulic pipe expansion coupling devices (couplers) for low and medium pressure ranges (manufactured in several hundred units or less) have been on the market and have been used effectively, but Coupler was not found at all in the past.

When performing pipe expansion work using ultra-high liquid pressure in this way, conventionally the tube insertion tool is screwed to the pressure intensifier, which not only makes it difficult to insert the tube insertion tool, but also causes damage to the tube insertion tool. This has been a bottleneck to efficiency improvement and automation.

Therefore, the object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a hydraulic tube expansion and connection device that enables connection and disconnection of the insertion tool and the pressure intensifier, and not only improves tube expansion efficiency but also enables automation of tube expansion. This is what I did.

The feature is that in the hydraulic pressure pipe expansion connecting device that connects the tube end insertion tool and the pressure intensifier, the outer cylinder provided on the hydraulic pressure introduction shaft and the outer cylinder are slidably fitted. , a radially movable fixed wind which is attached to the hydraulic pressure introduction shaft, has a piston with a tapered surface formed on the inside thereof, a tapered surface that matches the piston taper surface on the outside thereof, and an engaging portion formed on the inside thereof. Therefore, the retaining portion of the fixed air is configured to engage with the retaining portion of the tube end insertion tool.

An embodiment of the present invention will be described in detail below with reference to FIG.

The first section shows a cross-sectional view of a hydraulic pipe expansion and coupling device (ultra-high pressure auto coupler) that is applied to pipe expansion work using ultra-high hydraulic pressure as a method of expanding and fixing tubes to the tube plate of a multi-tube heat exchanger, etc. As shown in the figure.

3 is a tube end insertion tool, which is used to connect the tube 1 and the tube plate 2.
It is inserted into the end of the tube to expand it.

15 is a tube positioning socket, and 4 is an engaging portion 4a on the outside thereof.
The sockets are continuous sockets each having a threaded connection to the insertion tool 3 and fixed to the tube end insertion tool 3 with a rotation stopper bolt 16.

13 is a pressure intensifier which is a source of hydraulic pressure generation.

The tube end insertion tool 3 and the pressure intensifier 13 are connected by the hydraulic tube expansion and connection device of the present invention, and its detailed structure will be described below.

Ultra-high liquid pressure introduction shaft 1 to ultra-high quasi-pressure source 13 (normal pressure intensifier)
1 is fixed with screws or the like.

An outer cylinder consisting of a hydraulic cylinder body 5 and a cylinder lid 10 is attached to the ultra-high hydraulic pressure introduction shaft 11 with a tightening nut 12.
Further, a fixed winding 8 is screwed and fixed to the tube end insertion tool 3.

A bolt 14 connects the hydraulic cylinder body 5 and the lid 10.

This fixed water 8 has a taper 8a on the outside and an engaging part 8b on the inside thereof, and has a structure that is movable in the radial direction, and the engaging part 8b engages with the engaging part 4a of the connection socket 4. do.

A piston 7 is slidably fitted in the hydraulic cylinder 5 of the outer cylinder, and has a tapered surface 7a formed inside thereof, which matches the tapered surface 8a.

6 is an O-ring.

When hydraulic pressure is applied to the piston 7 from one of the hydraulic pressure inlet ports 9, the piston 7 moves in the left and right directions.

The relative positions of the connection socket 4 and fixed water 8 are adjusted after adjustment.
It is fixed with a rotation stopper bolt 16.

Next, to explain its function, the ultra-high pressure liquid generated by the pressure intensifier 13 passes through the liquid pressure introduction shaft 11, passes through the introduction port in the tube expansion insertion tool 3, is guided to the inner surface of the tube, and expands the tube 1. do.

Therefore, the present hydraulic pressure pipe expansion and connection device is designed so that the pipe expansion insertion tool 3 inserted into any pipe 1 and the hydraulic pressure introduction shaft 11 attached to the pressure intensifier 13 can be arbitrarily connected and disconnected. .

In a moment, we will discuss the case where both are consecutive.

With the tip of the hydraulic pressure introduction shaft 11 and the tube expansion insertion tool 3 in contact,
When hydraulic pressure is applied to the left inlet 9, the piston 7 starts moving to the right.

Since the inner surface of the piston 7 is tapered as shown in the figure, the fixed water 8 installed on the inner surface of the piston is
Press the tapered portion 8a of the holder to apply a force to reduce the diameter.

The fixing claw 8 has a structure in which slits are formed at eight locations on the circumference, so that it can be easily changed in the radial direction.

In this state, the tip of the fixed water 8 and the connection socket 4 are connected.

Furthermore, since the connection socket 4 is screwed to the tube expansion insertion tool 3, the tube expansion insertion tool 3 and the hydraulic pressure introduction shaft 11 are connected.

Furthermore, since an ultra-high pressure acts on the connecting surface and a force that separates the two, the hydraulic pressure supplied to the inlet 9 must be sufficient to generate enough force to overcome this force. It is.

Needless to say, disconnection can be easily performed by applying hydraulic pressure to the right inlet port 9.

As described above, according to the present embodiment, the outer cylinder provided on the hydraulic pressure introduction shaft 11, the piston 7 that is slidably fitted in the outer cylinder and has the tapered surface 7a formed inside the outer cylinder, and the hydraulic pressure introduction The fixed water 8 is attached to the shaft 11 and consists of a radially movable fixed water 8 having a surface 8a on the outside that matches the piston taper surface 7a and an engaging portion 8b formed on the inside thereof.
The engaging part 8b of the tube end insertion tool 3 and the engaging part 4a of the tube end insertion tool 3 are held together by supplying pressure oil to the hydraulic pressure inlet 9 and moving the piston I in the axial direction. can be easily connected.

Further, since the separation can be easily performed by moving the piston 7, automation of hydraulic pipe expansion becomes possible.

As described above, according to the present invention, the hydraulic pressure tube expansion connecting device that connects the tube end insertion tool and the pressure intensifier is connected to an outer cylinder provided on the hydraulic pressure introduction shaft, which is slidable inside the outer cylinder. A piston that is fitted into a piston and has a tapered surface formed on the inside thereof; a piston that is attached to the hydraulic pressure introduction shaft and has a tapered surface that matches the piston taper surface on the outside thereof, and a retaining portion formed on the inside thereof that moves in the radial direction. By configuring the engaging portion of the fixed water to engage with the engaging portion of the tube end insertion tool, the following effects can be achieved.

Previously, the tube expansion insertion tool was attached directly to the extender, making it difficult to insert and pull out the insertion tool, and it was difficult to automate hydraulic tube expansion due to frequent damage to O-rings, etc. By installing the connecting device of the present invention on the hydraulic pressure intensifier side, it can be connected to a tube expansion insert inserted into any pipe.

It becomes possible to perform pipe expansion and disconnection sequentially, making it possible to automate hydraulic pipe expansion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of the present invention. 1...Tube, 2...Tube plate, 3°°°゛°
°Tube expansion insertion tool・5゛°. ... Hydraulic cylinder body, 7 ... Piston, 7
a... Tapered surface, 8... Fixed water, 8a
...Tapered surface, 8b...Engagement portion, 11
......Liquid pressure introduction shaft, 13...Pressure intensifier.

Claims (1)

[Scope of utility model registration request] In a hydraulic pressure pipe expansion connecting device that connects a pipe end insertion tool and a pressure intensifier, an outer cylinder provided on a hydraulic pressure introduction shaft is slidably fitted into the outer cylinder, and a tapered surface is formed on the inside of the outer cylinder. The piston is attached to the hydraulic pressure introduction shaft, has a tapered surface matching the piston taper surface on the outside, and an engaging portion on the inside thereof, and is movable in the radial direction. A connecting device for hydraulic pipe expansion, characterized in that an engaging part of a fixed wind is configured to engage with a retaining part of a tube end insertion tool.