JPS6261372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for inserting a pipe into a laminated fin body such as a heat exchanger for an air conditioner or the like. In particular, it relates to means suitable for long heat exchangers.

As shown in Japanese Utility Model Application Publication No. 52-152456, the conventional method of inserting a pipe is to extend a leaf spring into a plate shape from one end of a hole through which the pipe is passed, and insert it into the hole. After connecting to the fitting, the pipe is inserted into the hole by winding and pulling the leaf spring. The engagement tool includes a crimping body that is inserted into a pipe and has a plurality of expansion pieces that expand in the radial direction, and an expanding metal piece that passes through the center of the crimping body and has a tapered part. Consisting of When this engagement tool is inserted into the pipe and the leaf spring is used to expand the metal fitting, the expanding piece expands in the radial direction due to the tapered portion and comes into close contact with the inner surface of the pipe.

However, since the axial position of the crimp body is not fixed relative to the expansion hardware, when the leaf spring is pulled,
It is thought that the expanding hardware and the crimping body move together and the expanding piece does not come into close contact with the inner surface of the pipe.

In the device shown in Japanese Utility Model Application Publication No. 54-34470, an expanding piece is provided at the tip of a cylindrical body, and the expanding piece is expanded by a tapered portion at the tip of a rod that passes through the cylindrical body. In this case, since the rod moves with respect to the cylindrical body, it is thought that the expansion piece comes into close contact with the inner surface of the pipe.

However, in this case, since the expansion piece comes into contact with the linear inner surface of the pipe, the engaging tool easily comes off from the pipe. In order to prevent the expansion piece from coming off, it is necessary to expand the expansion piece strongly, and therefore, a large force is required to move the expansion hardware.

An object of the present invention is to enable reliable insertion of a pipe.

In the present invention, a tapered part having a small diameter on the tip side is provided at the end of the cylinder, and an expansion piece that expands by contacting the tapered part is provided at the end of the rod inside the cylinder, so that the expanded expansion piece can be expanded. It is designed to engage with the small diameter portion of the pipe.

The present invention will be explained below with reference to an embodiment shown in the drawings. Figure 1 shows an example of a heat exchanger.
1 is a fin with a hole, and 2 is a pipe passed through the hole.

FIG. 2 shows an overall view of the pipe insertion device. A fin 1 with holes 3 is stacked on a case 4 and placed on a table 5. 6 is a positioning member.

On one side of this table 5 is a pipe stocker 1.
0 is provided, and the inserted pipe 2 is placed.
11 is a pipe inlet of the stocker 10, and 12 is a pipe outlet of the stocker 10.

On the other side of the table 5 is a main device 2 for inserting the pipe 2 of the stopper 10 into the hole of the laminated fin 1.
0 is set. This main device 20 slides on rails 21. 22 is a stand, and the front end 23 serves as a support stand for an insertion bar 33 and the rail 21, which will be described later, and the insertion bar 33 passes through. The rear end 24 supports the rail 21.

As shown in FIG. 3, this main device 20 includes a U-shaped moving table 32 that slides on a rail 21 by a cylinder 31 of a reciprocating device, an insertion bar 33 that is inserted through a hole 3 in a fin, and a front end of this. An expansion pawl 34 that is positioned and engages with the small diameter portion 2a at the inner tip of the pipe 2, an operating rod 35 that operates the expansion and contraction of the expansion pawl 34, and a spring 3 that biases the operation rod 35 backward.
6, and an air piston 37 that pushes the operating rod 35 and contracts the expansion claw 34.

The rear end of the operating bar 33 is screwed to the front piece 32a of the U-shaped moving table 32 via a seat 38. Further, an air piston 37 is provided on the rear piece 32b of the moving table 32.

The expansion pawl 34 is screwed and fixed to the tip of the operating rod 35, and the tip is tapered and the rear end is the expansion pawl 34. The expansion claw 34 is provided with a plurality of cuts 34a in the axial direction so that it can be bent in the radial direction. 43 is a tapered metal fitting, and the insertion bar 3
3, and the expansion claw 34 rides on the tapered surface 43a to expand the claw. At this time, the outer diameter of the expansion claw 34 is smaller than the hole 3 and larger than the small diameter portion 2a of the pipe 2.

The operating rod 35 passes through the insertion bar 33 and the tapered metal fitting 43 and is movably provided. 44 is a spring seat screwed onto the rear end of the operating rod 35, and the pin 37 of the air piston 37
Pushed by a.

The expansion claw 34 expands in the radial direction to open the pipe 2.
an expansion member that engages with the expansion member; The spring 36, air piston 37, etc. constitute an operating device for moving the operating rod 35.

The operation of such a configuration will be explained. A case 4 in which fins 1 with holes 3 are stacked is placed at a predetermined position on a table 5. A pipe 2 is placed in a pipe stocker 10. The tip of this pipe 2 is provided with a small diameter. For example, it can be obtained by cutting with an eccentric cutter.

In this state, the cylinder 31 operates, and the moving table 32
slides on the rail 21, and the insertion bar 33, expansion claw 34, operating rod 35, air piston 37, etc. fixed to the moving table 32 move forward. Therefore, the insertion bar 33 enters the hole 3. At this time, the air piston 37 is retracted, and the operating rod is retracted by the spring 36. For this reason, the expansion claw 34
is expanding.

When the extension claw 34 advances to the vicinity of the pipe 2 by a predetermined amount, a limit switch (not shown) provided between the bases 22 and 32 is activated, the air piston 37 is activated, and the pin 37a is advanced. Then, the operating rod 35 is advanced against the spring 36, and the expansion claw 34 is contracted. The expansion claw 34 has a diameter that allows it to enter the small diameter portion 2a of the pipe 2.

In this state, the moving table 32 moves further forward, and when the expansion claw 34 enters the pipe 2 and the state shown in FIG. 5 is reached, the forward movement stops and the air piston 37
The operation of the operating rod 3 is stopped and the spring 36
5 retreats. Therefore, the expansion claw 34 expands and engages with the small diameter portion 2a of the pipe 2. This is the state shown in FIG.

Next, the movable table 32 starts to retreat and pulls out the pipe into the hole 3.

When the pipe 2 has been inserted, the air piston 37 is operated again by a limit switch (not shown), the expansion claw 34 is contracted to release the engagement with the pipe 2, and the stand 32 is further retreated. When the expansion claw 34 is removed from the pipe 2, it is stopped by a limit switch (not shown). That's all.

As described above, the expansion claw 34 is attached to the small diameter portion of the pipe 2.
Since the pipe 2 is pulled by engaging with the hole a, the pipe 2 can be reliably inserted into the hole.

In the above embodiment, the operating rod 35 penetrating the inside of the insertion bar 33 is moved, but it is also possible to use the outer cylinder as the operating rod to operate the expansion and contraction of the expansion claws.

In addition, the pipes 2 of the heat exchanger have two rows and two stages,
When inserting pipes using the main insertion device 20 of one stage and two rows in the above embodiment, when the first stage is inserted, the table is raised or lowered, the holes that are not inserted into the main insertion device 20 are aligned, and the second stage is inserted. Insert eyes.

As described above, according to the present invention, since the pipe is inserted by being pulled, the pipe can be easily inserted.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heat exchanger as an example of the object of the present invention, FIG. 2 is an overall perspective view of an apparatus as an embodiment of the present invention, and FIG. 3 is a sectional view of the main insertion device of FIG. FIG. 4 is a plan view of the expansion claw of FIG. 3, FIGS. 5 and 6 are cross-sectional views of main parts of the main insertion device of FIG. 3, and FIG. FIG. 5 is a state diagram when the expansion claw is inserted into the pipe, and FIG. 6 is a state diagram when the pipe is passed through the fin hole. 1...Fin, 2...Pipe, 2a...Small diameter part, 3...
Fin hole, 10... Pipe stocker, 20... Main insertion device, 31... Cylinder, 32... Moving table, 33... Insertion bar, 34... Expansion claw, 35... Operation rod, 36
...Spring, 37...Air piston, 43...Tapered metal fitting.

Claims (1)

[Claims] 1. An insertion bar that is large enough to be inserted into a hole in a laminated fin, and an insertion bar that can be inserted into a pipe to be inserted,
a tapered metal fitting that is attached to the front end of the insertion bar and has a smaller diameter on the front end side; and a rod that penetrates through the inside of the insertion bar and the tapered metal fitting in the axial direction, protrudes at both ends, and is movable with respect to the insertion bar. , is provided on the front end side of the rod on the front side of the tapered metal fitting, is insertable into the inserted pipe, and expands in the radial direction by contacting the tapered surface of the tapered metal fitting, and extends to the end of the inserted pipe. an expansion member that engages with a small diameter portion of the rod, the insertion bar is provided on a moving table that moves back and forth by a reciprocating device, and an operating device that moves one of the insertion bar and the rod back and forth relative to the other. A device for inserting a pipe into a laminated fin, characterized in that it is provided on the movable table.