JPS59295B2 - Pipe joining equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe joining device that joins two pipe materials by plastically deforming the joining ends of the pipe materials.

Traditionally, pipe materials are joined by caulking the joined ends of the overlapped pipe materials using a rotating press roll, but since the press roll has a rotating part, the structure is complicated and expensive. Furthermore, there were drawbacks such as the large size of the device and the difficulty in handling it at the piping work site.

The present invention was completed with the aim of providing a tube joining device free of the above-mentioned drawbacks, and the illustrated embodiments will be described in detail below.

In the first embodiment shown in FIGS. 1 to 5, 1 is a hydraulic cylinder, and a base 3 of a holder 2 is screwed onto the front end of the cylinder. A pair of clamp frames 6 and T are pivotally supported at the portion by hinge pins 5.

Furthermore, a bracket 10 is attached to the tip of the piston rod 8 of the hydraulic cylinder 1, and the bracket 10 has a long hole 9 at both ends perpendicular to the direction in which the piston rod moves. On the other hand, a long hole 11 extending toward the tip of the clamp frame is formed near the base of each clamp frame 6, T.
A pin 12 is inserted into the clamp frame opening/closing device. As a result, when the piston rod 8 extends leftward from the state shown in FIG. 1, the clamp frame 6, T is pushed by the bracket 10 and closes as shown in FIG. 2. As shown in FIG. 4, a holding member 16 is fixed to each clamp frame 6, T for clamping the joint ends 15 of the pipe materials 13, 14 to be joined.
, T are closed, the joined ends 15 of the tubes 13, 14 are clamped to the holding member 16, except for the part 16' to be plastically deformed. Each clamp frame 6, T has a latch claw IT, 1 that can approach the portion 16' of the tube material 13, 14 to be plastically deformed from two directions perpendicular to each other.
8 are provided respectively. These latch claws 17, 1
The direction of movement of 8 is 450 degrees with respect to the straight line connecting the center of the hinge pin 5 and the centers of the clamped tubes 13 and 14, and these latch claws 17 and 18 move toward the clamp frame 6.
, 7, and is guided by guide grooves 19 and 20 formed in the guide grooves 19 and 7 to perform the approaching movement. In addition, each clamp frame 6, T has one cam plate 21 that can move toward the tip of the clamp frame.
and the other cam plate 2 that can move toward the center of the clamp frame.
2, and the pin 12 of the clamp frame opening/closing device described above passes through the base of the 10,000 cam plate 21. The 10,000 cam plate 21 has a downward cam surface 23 that forms an angle of 45 with respect to its advancing direction, and this cam surface 23 is in close contact with the outer surface 24 of one of the above-mentioned latch claws 17. Therefore, when one of the cam plates 21 moves toward the distal end of the clamp frame, the cam surface 23 presses one of the latch claws 17 toward the tube members 13 and 14. Moreover, since the cam surface 25 formed at the rear end of the other cam plate 22 is in close contact with this cam surface 23, the hydraulic cylinder 1 is operated in the state shown in FIG. 2 with the clamp frames 6 and 7 closed. Then, hydraulic cylinder 1
The bracket 10 is also advanced by the piston rod 8 which moves forward due to the operation of the bracket 10, and the pin 12 passing through the cam plate 21 is fitted into the elongated hole 9 of the bracket 10.
, the cam plate 21 moves within the clamp frames 6 and 7 toward the distal end of the clamp frame, and as one cam plate 21 advances, the other cam plate 22 moves.
is pressed and moved toward the center of the clamp frame. The other cam plate 22 also has a cam surface 26 perpendicular to the cam surface 25.
is formed, and the outer surface 2 of the other latch 18 described above is
It borders on 7. When the other cam plate 22 is pressed by the cam surface 23 of one cam plate 21 and moves toward the center of the clamp frame, the other latch 18 is pressed by the cam surface 26 of the other cam plate 22. This results in a close movement toward the tubes 13 and 14. In order to join pipe materials using the pipe joining apparatus configured as described above, first, as shown in FIG. 1, both clamp frames 6 and 7 are opened at the sides,
At the center thereof, as shown in FIG. 6, the tube members 13 and 14 with joined end portions 15 overlapped are placed.

Next, operate the hydraulic cylinder 1 and press the piston rod 8.
When the piston rod 8 is moved forward, a bracket 10 attached to the tip of the piston rod 8 pushes both clamp frames 6 and 7 through a pin 12, and both clamp frames 6 and 7 are closed as shown in FIG. At this time, the joint ends 15 of the tubes 13 and 14 are clamped by a holding member 16 as shown in FIG. When the piston rod 8 moves further forward from the state shown in FIG. 2, the pin 12 is pressed by the side surface of the elongated hole 9 of the bracket 10.
The pin 12 slides along the elongated hole 11 of the clamp frame to move one cam plate 21 toward the tip of the clamp frame. As a result, one of the latch claws 17 is attached to the cam surface 2 of one of the cam plates.
At the same time, the other cam plate 22 also moves toward the center of the clamp frame, and its cam surface 26 moves the other latch 18 toward the clamped pipes 13, 14. The state shown in FIG. 3 is obtained when the two are brought closer to each other.
As shown in FIG. 4, the tips 28 of each of these latch claws face the portion 16/ of the outer tube 13 to be plastically deformed, so that this portion 16' can be deformed from four directions perpendicular to each other. The tube members 13 and 14 are pressed and plastically deformed inward by the four latch claws 17 and 18, and the tube members 13 and 14 are firmly joined to each other. Although it is preferable that the tip 28 of each latch is an arcuate surface, it is also possible to form a small protrusion on a part of it to form a concave part at the joint of the pipe material and obtain a rotation prevention effect. It is. After the joining is completed in this way, by retracting the piston rod 8 of the hydraulic cylinder 1, each latch is moved by the springs 29 and 30 stretched between the clamp frames 6 and 7, as shown in FIG. It returns and the Cranzo frame also opens as shown in Figure 1. In the embodiments described above, the movement of the latch claws approaching the tube material was used to directly press the connecting end of the tube material to cause plastic deformation.
Depending on the material of the tube material, when such a joining method is used, wrinkles may occur at the joint, so another embodiment that solves this drawback will be described below. In the second embodiment of the present invention shown in FIGS. 7 to 10, the structures of the clamp frame, its opening/closing device, and two cam plates are the same as in the first embodiment, but the structure of the latch is different. They are different. That is, in this embodiment, both one of the latch claws 31 and the other latch claw 32 have concave portions 33 and 34 on the front surface in the direction of movement, and these concave portions have sloped surfaces as shown in FIG. It is formed. As shown in FIG. 7, a semicircular brace member 39 formed by protruding outwardly the inclined surfaces 37 and 38 in contact with these inclined surfaces is held in the concave portions 33 and 34 of each latch. It is held in such a way that it is exposed. A semicircular recess 40 that is almost equal to the outer diameter of the tube material is formed in the center of this brace member 39, so when the upper and lower clamp frames are closed as shown in FIG. 8, the upper and lower brace members 39 are also tightly fitted. It becomes shaped like a donut with four wings. As shown in FIG. 8, each latch claw 31, 3
2 is a spring 41, 4 stretched between the clamp frame and the
When in the retracted position due to the tension of 2, the brace member 3
9 is in the position shown by the imaginary line in FIG. 10, but when the respective latch claws 31, 32 start moving toward the pipe material as in the first embodiment, the press member 39 moves the respective latch claws 31, 32 toward the pipe material. 3
Pressed by the inclined surfaces of the second concave portions 33 and 34, the first
Move to the Uman side of Figure 0. Since a tapered surface 43 is formed on the front surface of this breather member 39 in the moving direction, the portion of the tube material clamped to the holding member 44 to be plastically deformed is formed on the taper surface of this breather portion 39 as in the first embodiment. Side 4
3, the tubes are pressed from the axial direction and plastically deformed inward, and the tubes are strongly joined to each other. In this case, since the joint end portions are pressed with uniform force over the entire surface, wrinkles do not occur in the joint portions, and a more preferable joint can be obtained. After the joining is completed, the state shown in FIG. 8 is returned to the state shown in FIG. 7, which is the same as in the first embodiment. In addition, in any of the embodiments, the inner part of the latch is configured in a force set shape so that it can be easily replaced according to the pipe diameter, so that piping work for various pipe diameters can be performed quickly. This is taken into consideration. As is clear from the description of the above embodiments, the present invention has a clamp frame that is pivotably supported by a hinge pin and is openable and closable, and is provided with a latch, so it does not have a rotating part like a conventional breath roll, and has a structure that is simple. It has the advantage of being simple and inexpensive to manufacture, and also has the advantage that when one cam plate cleverly connected to the clamp frame opening/closing device is pushed toward the tip of the clamp frame, the other cam plate moves in a direction perpendicular to this. Since the cam surface formed on each cam plate is configured to press the two latch tabs toward the pipe material, the movement given to the first cam plate is smoothly transmitted to each latch tab by the action of the cam, In addition, since the moving distances of each latch are exactly the same, the joint ends of the tubes are smoothly plastically deformed with uniform force, resulting in a strong connection. Moreover, since each of the pair of clamp frames is provided with two latch claws that can approach the pipe material from two directions perpendicular to each other, it is possible to pressurize the joined ends of the pipe material from 40,000 degrees at equal intervals. , it is possible to plastically deform the entire circumference of the pipe material uniformly, and if necessary, by using the approaching movement of the latch claws from all sides, the joint end can be deformed from the axial direction of the pipe material as in the second embodiment. Plastic deformation is also possible. Furthermore, since one of the cam plates is connected to the clamp frame opening/closing device, there is an advantage that the opening/closing of the clamp frame and the approaching movement of the latch can be performed sequentially using a single drive device, and the structure is simplified. It has various advantages such as being simple and having almost no risk of failure, the entire device can be miniaturized, and is easy to handle.It is an extremely important product that it brings to the industry as a device that eliminates the drawbacks of conventional pipe joining devices. It is.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention,
Fig. 1 is a partially cutaway front view showing the clamp frame in an open state, Fig. 2 is a partially cutaway front view showing the clamp frame in a closed state, and Fig. 3 shows a state in which the latch is close to the pipe material. FIG. 4 is a partially cutaway front view, FIG. 4 is a sectional view taken along line A-A in FIG. 3, FIG. 5 is a partially cutaway plan view, and FIG. FIG. 7 to FIG. 10 show a second embodiment of the present invention;
Fig. 7 is a partially cutaway front view showing the clamp frame in an open state, Fig. 8 is a partially cutaway front view showing the clamp frame in a closed state, and Fig. 9 shows a state in which the latch is close to the pipe material. The partially cutaway front view and FIG. 10 are a sectional view taken along the line BB in FIG. 9. 6, 7... Clamp frame, 17, 18...
・Lower claw, 21, 22...Cam plate, 23...
...Cam surface, 26...Cam surface, 31, 32.
...Picked nails.

Claims (1)

[Claims] 1 A pair of clamp frames that clamp the joint ends of pipe materials are pivotally supported by hinge pins, and each clamp frame has two latch claws that can be approached toward the pipe material from two directions perpendicular to each other, and each latch claw has Two corresponding cam plates are provided, and one cam plate connected to the clamp frame opening/closing device has a cam surface that presses one of the latch claws toward the pipe material when the cam plate moves toward the tip of the clamp frame. and also the first
A pipe joining device characterized in that a second cam plate that moves toward the center of the clamp frame when pressed by the cam plate is formed with a cam surface that presses a second latch toward the pipe material during movement. .