JPS58184025A - Self aligning type pipe expanding device - Google Patents

Abstract

PURPOSE:To automate pipe expanding work fully by giving the pressing rod of a pipe expanding jig four degrees of freedom and thereby aligning and inserting the pipe expanding jig automatically. CONSTITUTION:When the head 5 of a pipe expanding jig is inserted into the opening of a pipe 2, the first part 3 of a working rod to which the pipe expanding jig is attached rotates freely relatively around the pin of a connector 12, and displaced freely in axial direction of the pin by a compression spring, and the center of the first part 3 of the pressing rod coincides with the center axis of the pipe 2. The first part 3 of the pressing rod is kept parallel to the pipe 2 by the compression spring and the axis of the head 5 is adjusted to align with the pipe 2, and the pipe expanding jig is inserted into the opening of the pipe 2. Then, the second part 4, the head 5 etc. of the pressing rod are pulled back by operation of a hydraulic cylinder 10, and the diameter of pressure medium rubber 7 is enlarged by compression between seal rings 6, 6'. The opening of the pipe 2 is expanded and the opening of the pipe 2 is pressure welded to the pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic six-deaf tube expansion device in which a pressure rod of a tube expansion jig has four degrees of freedom.

When inserting a tube expansion jig into a pipe to be expanded, if the central axis of the tube and the cross-sectional center of the tube expansion jig are even slightly misaligned, the jig cannot be inserted.

Therefore, conventionally, the insertion of a tube expansion jig into a pipe has largely been done manually by workers;

Automation of mounting is desired.

By the way, the necessary conditions when inserting a tube expansion jig into a tube are as follows.

(1) The cross-sectional center of the tube expansion jig must be on the central axis of the tube.

(2) The pipe and the tube expansion jig must be parallel.

In order to satisfy these <1) and @ conditions, the following requirements are required. ~ (2) The pressure rod to which the tube expansion jig is attached can be freely rotated around two axes Y, ``2'' that are perpendicular to the axis X thereof.

(2) It can be freely adjusted in the directions of the two axes Y and Z.

Therefore, it is necessary to provide the pressure rod with four degrees of freedom.

An object of the present invention is to provide a self-aligning device that can provide four degrees of freedom to the pressure rod of a tube expansion jig.

The feature of the present invention is that the pressurizing rod is divided into a first part and a second part in the axial direction, a tube expansion jig is attached to the first part, the second part is connected to a pressurizing drive source, and the second part is connected to a pressurizing drive source. 1. the second portions are connected by a four-degree-of-freedom connector, the first portion of the pressure rod is rotated about two axes that are relatively perpendicular to the axis of the first portion; With this structure, the above object can be reliably achieved.

Hereinafter, the present invention will be explained based on the drawings.

1 to 5 show an embodiment of the present invention, in which the mouth of a round tube 2 inserted into a tube plate 1 is crimped.

In this embodiment, the first. Second part 3.4
a pressure rod divided into a first part 3 of the pressure rod;
Attached to the tube expansion jig, pressurizing drive source, and the first pressurizing rod. It includes a connector 12 that connects the second portion 3.4, and a moving table 24 that reciprocates these members.

The tube expansion jig has a Beelets □i-shaped head 5, a pressure medium rubber 7 provided between seal rings 6 and 6', and a restraining ring 9 attached to a support member 8, and the head 5 and the seal ring 6.6' and the pressure medium rubber 7 are inserted until the restraint ring 9 abuts the tube plate 1, and then
As the part 3 is pulled back, the diameter of the pressure medium rubber 7 increases and the diameter of the tube 2 can be expanded.

The pressurizing drive source includes a hydraulic cylinder 10 and a piston 11 fitted into the hydraulic cylinder 10.
A second part 4 of the pressure rod is connected to. This pressurizing drive source is applied to the hydraulic cylinder 1 after inserting the pipe expansion jig.
0 to the pullback side, the piston 11, the second part 4 of the pressure rod, the connector 12 and the first part 3
The diameter of the pressure medium rubber 7 can be increased by pulling back the tube expansion jig through the pressure medium rubber 7.

The connector 12 is connected to the first connector of the pressure rod. second part 3
, 4 and are combined with a 90◎ phase shift around the axis to form a nine U-shaped first. 1st. 2 yokes 13, 14, these first yokes 13, 14. second yoke 13
．． Nine common blocks 15 disposed inside the first yoke 14, pins 16.16' coaxially screwed into the common block 15 from the outside of the first yoke 13, coaxially screwed into the common block 15 from the outside of the second yoke 14; Bin 17 screwed on top
．． 17', a compression spring 18, 18' mounted on the outer side of the bin 16, 16' and compressed between the first yoke 13 and the common block 15, and the via 17, 1? Wrapped on the outside of ' and 2nd C)! 20.Nine compression springs 19, 19' are compressed between the first eyelet 14 and the common block 15, and spring brackets protrude from the center of the end face of the first eyelet 13 and the opposite end face of the common block 15)20. 20' and compressed between the first yoke 13 and the common block 15, a compression spring 22, and a spring protruding from the center of the end face of the second yoke 14 and the end face of the common block 15 opposite thereto. Plaquet) 21.21' wrapped around the yoke 13
and nine compression springs 211 which are compressed between the shared block 15, thereby forming a nine-bin joint.

By means of the connector 12, the first part 3 of the pressure rod is free to rotate about the axis Y about the pin 16° 16' perpendicular to its axis X, and the compression spring 18,
18' can be freely displaced in the direction of the axis Y. Further, the first portion 3 of the pressure rod has an axis 2 having piers 1'l, 17' in a direction perpendicular to the axis X,
Rotates freely around the iron ring 2 and has compression springs 19, 19
' allows it to be freely displaced in the direction of the axis 2. And the first part 3 of the pressure rod is a compression spring 22
, 23 are held parallel to the pipe 2.

That is, the connector 1 is connected to the first part 3 of the pressure rod.
2 gives 4 degrees of freedom.

The moving table 24 is linked to an NC device (not shown), and has a tube expansion jig, a pressurizing rod, and a pressurizing drive source mounted thereon, and moves these members toward and away from the tube 2. It is now possible to move it to Note that the hydraulic cylinder 10
Elastic bodies 25 are provided on both sides of the moving table 24 at both ends in the axial direction.

The self-aligning deaf tube dilation device of the above embodiment operates as follows.

That is, as shown in FIG. 1, as the moving table 24 is moved toward the forward side by the NC device from a set position away from the pipe 2 to be diameter-expanded, the pipe expansion jig, pressure rod, and pressure The drive source is moved in a direction approaching the tube 2, and a tube expansion jig is inserted into the mouth of the tube 2.

When the head 5 of the tube expansion jig is inserted into the mouth of the tube 2, if the axes of the tube 2 and the head 5 are misaligned, the pressure rod to which the tube expansion jig is attached will be inserted. Part 3 of connector 2 is relatively connected to pin 16, 16' or pin 17.
17' and rotates freely around the compression spring 18.18
'or by means of compression springs 19, 19' bins 16.16'
or in the axial direction of the bottle 17, 17', the center of the cross section of the first part 3 of the pressure rod coincides with the central axis of the tube 2, and the compression spring 22 , 23 of the pressure rod against the tube 2.
3 are held parallel and automatically adjusted so that the axis of the head 5 coincides with the tube 2.

Therefore, the tube expansion jig can be mechanically and smoothly inserted into the mouth of the tube 2 whose diameter is to be expanded.

After inserting the tube expansion jig to a position where the restraining ring 9 contacts the end of the tube 2, when the hydraulic cylinder 10 serving as the pressurizing drive source is operated to the retracting side as shown in FIG. 2, the piston 11
, the second part 4 of the pressure rod, the connector 12, the first part 3 of the pressure rod and the head 5 are pulled back, so that the pressure medium rubber 7 is axially moved between the sealing rings 6, 6'. As shown in FIG.
Crimp the mouth of the

After the mouth of the tube 20 is crimped onto the tube plate l as described above, the hydraulic cylinder 10 is operated in the direction of pushing back each member, the pressure medium rubber 7 is expanded in the axial direction, and the pressure on the mouth of the tube 2 is released. , the moving table 24 is moved to the return side, and the set position is changed.
,, is returned and one cycle is completed.

Next, FIGS. 6 and 8 show a second embodiment of the present invention, in which the connector is different from that of the first embodiment.

That is, in this embodiment, between the first part 3 of the pressure rod, the intermediate rod 26 and the second part 4 of the pressure rod,
It is configured to have first and second bin joints 2 and 28 that are out of phase by 90' around the axis.

The first binge joint 27 is provided in the first portion 3 of the pressure rod and the intermediate rod 26, and extends 90 degrees around the axis.
'U-shaped yoke 29 combined with different phases.
31% both yokes 29.9 pin 3 is inserted across 31
3. A compression spring 36.36' is provided in the gap 35.35' between both yokes 29°31. This first
Due to the bin joint 27, the first part 3 of the pressure rod is free to rotate in the direction of the axis Y of the pressure rod, which is perpendicular to its axis X, and freely in the axial direction of the bin 33. It is capable of change.

The second binge joint 28 is provided in the second portion 4 of the pressure rod and the intermediate rod 26 and extends 90 degrees around the axis.
° U-shaped combinations with different phases! -ri30,
32, bottle 3 inserted across both yokes 30.32
4. The yoke 30.3 is wrapped around both ends of the pin 340.
a compression spring (not shown) compressed between the intermediate rod 2;
This second binge joint 2B is provided with means 9 for holding the pressure rod parallel to the tube to be expanded.

The cough parallel holding means includes a guide groove 38 formed long in the axis X direction on both sides of the yoke 300 provided on the second portion 4 of the pressure rod in the axis Y direction, and a yoke 32 provided on the intermediate rod 26. Adjustment screws 39 inserted from the outside toward each guide groove 38, guide pins 40 provided at the ends of each adjustment screw 39 and engaged with the guide grooves 38, and attached to the adjustment screws 39 on the outside of the yoke 32. The adjustment nut 42 is fitted to the compression spring 41S11 node screw 39.

As a result, the first part 3 of the pressure rod and the intermediate rod 26
According to said second binding joint 2B, a restraint is provided in the yoke 32 around a pin 34 provided in the direction of the axis 2 perpendicular to the axis X of the first part 3 of the pressure rod. The pin 3 rotates within the range regulated by the portion 37.
It can be freely displaced in the axial direction of the tube 4, and is further held parallel to the tube 2 by the parallel holding means.

Therefore, in this second embodiment as well, the connector allows
The first part of the pressure rod is provided with four degrees of freedom via the first and second pin joints 27, 28 and means for holding the pressure rod parallel.

Furthermore, FIGS. 9 and 10 show a third embodiment of the present invention.

In this embodiment, a tensioning member 45 extending in the direction of the restraint ring 9 is attached from the middle of a piston rod 44 connected to the piston 11, and a claw 46 is attached to the end of the separate tensioning member 45. , 1. I exist. Furthermore, a restraining cylinder 47 is provided at the end of the piston rod 44, into which the second portion 4 of the pressure rod is fitted.

On the other hand, the claw 4 is located in the middle of the first portion 3 of the pressure rod.
A protrusion 48 is provided which engages with 6.

On the other hand, the second portion 4 of the pressure rod
are fitted with a gap 49 in the axial direction.

In this embodiment, the hydraulic cylinder 10 of the pressurizing drive source is
When operated in the retracting side, the tube expansion jig is pulled through the piston 11, the piston rod 44, the pawl 46 of the tensioning member 45, and the protrusion 48 of the first portion 3 of the pressure rod, and a large load on the hydraulic cylinder 10 is applied. The first part of the pressure rod. The connector 12 of the second part 3.4 is prevented from acting.

Therefore, according to this third embodiment, the hydraulic cylinder 10
It is possible to prevent damage to the connector 12 due to a large load.

Note that the effects of the other configuration 1 of this embodiment are the same as those of the first embodiment.

Next, FIGS. 11 to 14 show a fourth embodiment of the present invention.

This embodiment differs from the third embodiment in the specific structure of the connector including means for holding the pressure rod parallel to the tube to be expanded.

That is, the second part 50 of the pressure rod is formed into a prison from the middle in the axial direction, one end 50' of which is connected to the first part 3 of the pressure rod and the connector 51, and the other end. is provided on the piston rod 44 and is fitted into the nine restraining cylinder 47 with a gap 49 therebetween.

The connector 51 has a first connecting member 52 hinged to the first part 3 of the pressure rod, and a second connecting member 53 attached to one end 50' of the second part 4 of the pressure rod. , 1st. Gap 55 between second connecting members 52 and 53
．． Connecting pin 54 fitted with 55', each gap 5
5.55' and compressed springs 56, 56'. The first connecting member 52 is connected to the first portion 3 by a fork end 57 provided thereon and a pin 58 provided at the first portion of the pressure rod, and is connected to the first portion 3 in the longitudinal direction of the pin 158. Compression springs 59, 59' are installed between the outside of the first portion 3 of the pressure rod and the inside of the fork end 57 at both ends of the pressure rod.

With this connector 51, the first part 3 of the pressure rod is free to rotate under the direction of an axis Y, which is perpendicular to its axis X, and the compression springs 56, 56'
The shaft is displaceable in the direction of the axis Y, and is also freely rotated by the rotation of the pin 58 provided in the direction of the shaft 2, which is perpendicular to the axis X, and by the compression springs 59, 59'. It is adapted to be able to be displaced in the direction of axis 2.

A balance way 60 is provided at the end of the first portion 3 of the pressure rod, and a vibration isolation spring 61 is stretched between the first and second portions 3 and 50 of the pressure rod. ing.

As a result, the first part 3 of the pressure rod is held parallel to the tube to be expanded by the balance weight roller 0,
In addition, the vibration is absorbed by the vibration isolating spring 61.

Therefore, in this fourth embodiment as well, four degrees of freedom are given to the first portion 3 of the pressurizing port rad by the connector 51 including the balance weight rod 0.

In addition, this #! The other configuration 1 functions of the fourth embodiment are the same as those of the third embodiment.

In addition, in the present invention, the specific structure of the connector is not limited to that shown in the illustrated embodiment, but the connector has a structure that can provide four degrees of freedom to the first portion of the pressure rod to which the tube expansion jig is attached. That's fine.

The present invention has the structure 9 described above, and according to the present invention, the first portion of the pressure rod to which the tube expansion jig is attached is connected to two axes that are relatively perpendicular to the axis X thereof. Since the tube expansion jig is rotated around Y and Z, displaced in the directions of the axes Y and Z, and held parallel to the tube to be expanded, the tube expansion jig is automatically aligned. , it has the effect of being able to insert the pipe, and it also has the effect of completely automating the pipe expansion work using the NC device.

[Brief explanation of the drawing]

Figures 1 to 5 show a first embodiment of the present invention, in which Figure 1 is a longitudinal sectional view showing the arrangement of each member when inserting the tube expansion jig, and Figure 2 is a longitudinal sectional view during tube expansion. Figure 3 is an enlarged longitudinal sectional front view of the same connector, Figure 4 is a cross-sectional plan view of the same, Figure 5 is a longitudinal sectional side view of the same, and Figures 6 to 8 are a second implementation of the present invention with a different connector. For example, Fig. 6 is an enlarged longitudinal sectional front view of the connector, Fig. 7 is an enlarged perspective view of the second binge joint of the same connector, and Fig. 8 is the pressure rod attached to the second binge joint. An enlarged perspective view of the parallel holding means, FIGS. 9 and 10 show a third embodiment of the present invention, and FIG. 9 is a longitudinal sectional view showing the arrangement of each part when inserting the tube expansion jig. FIG. 10 is a longitudinal cross-sectional view when the tube is expanded, and FIGS. 11 to 14 show a fourth embodiment of the present invention.
Fig. 11 is a longitudinal sectional view showing the arrangement of each member when inserting the tube expansion jig, Fig. 12 is a longitudinal sectional view during tube expansion, Fig. 13 is an enlarged longitudinal sectional side view of the connector, and Fig. 14 is an enlarged longitudinal sectional view of the same. f. f
,,6゜ ,.../゛2 1...-tube plate, 2... tube, 3.4... 1st degree second part of pressure rod, 5-9... tube expansion jig Members constituting 10... Hydraulic cylinder/hydraulic of pressurizing drive source, 11...
Piston, 12...Connector, 13-23...Members constituting the connector, 24...Moving table, 26...
Intermediate rod, 27-42... Member constituting the connector, 50... Second portion of the pressure rod, 51... Connector, 52-61... Member constituting the connector,
...Axes of the first part of the pressure rod, y, z...-two axes at right angles to -X. Agent Patent Attorney Usuhiri◆ ¥J11¥1 ¥i2[D Y 3 Figure ¥i4Figure 5Figure 8■9 Figure'vJIOguchi'fi 11 1121''vJ12riJ

Claims (1)

[Claims] Move the pressure rod in the axial direction to the first position. Divide into second part, first
A tube expansion jig is attached to the first part, the second part is connected to the pressurizing drive source, and the first part is connected to the pressure drive source. The second part is connected by a four-degree-of-freedom connector, and the first part of the pressure rod is connected to 1. It is configured so that it can be rotated around two axes that are relatively perpendicular to the axis of the first part, displaced in the direction of the two axes, and held parallel to the pipe whose diameter is to be expanded. A self-aligning tube expansion device characterized by: