JPH07323343A - Tube expanding device - Google Patents

Abstract

PURPOSE:To provide a compact tube expanding device which projects a mandrel not in use during the tube expansion to the other side of a press-fit table to be evacuated. CONSTITUTION:A tube expanding device is provided with a plurality of mandrels for tube expanding which are provided with a tube expanding billet 7b on one end side and having a locking part 7a on the other end side, a press-fit table 6 where a plurality of through locking holes 6b are cut so as to insert and lock the respective mandrels for tube expanding in a fall-out preventing manner in one direction through the respective locking parts, and a reciprocating means which reciprocates the press-fit table in an opposite manner to the tube to be expanded which is positioned in one direction of the press-fit table. In the tube expanding device 1 where the mandrel for tube expanding not in use is projected from the press-fit table to be moved to one direction during the tube expansion to the other direction of the press-fit table to be evacuated, the reciprocating means is provided on the circumferential surface part 6d of the press-fit table except the face and back surface parts of the press-fit table in which the through locking holes are punched.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube expanding device, and more specifically, to integrally fix a large number of heat radiation fins forming a heat exchanger and a hairpin tube inserted into each of the heat radiation fins. The present invention relates to a tube expanding device for press-fitting a tube expanding mandrel having a tube expanding billet into the hairpin tube to expand the tube.

[0002]

2. Description of the Related Art Conventionally, as a tube expanding device used for the tube expanding operation of the heat exchanger, as shown in FIG. 3 (a), a pair of columns 2 having a predetermined interval and each of the columns 2 are provided. A beam body 3 spanned for connection, a pair of guide posts 4 attached to both ends of the beam body 3 so as to be arranged in parallel with each of the columns 2, and a slidable outer member for the guide post 4. It is fitted and is reciprocally movable through the expansion and contraction movement of the expansion and contraction rods 5a of the pair of hydraulic cylinders 5 provided on the beam body 3, and has a pipe expanding billet 7b at one end and the other end. A plurality of pipe expanding mandrels 7 each having a locking portion 7a
There is a device provided with a press-fitting plate 6 having a plurality of through locking holes 6b for locking each of the two through the locking portion 7a so that they can be pulled out and locked in one direction. It is used to form the mainstream of equipment.

Further, in the tube expanding device 1 having the above-mentioned structure, as shown in FIG. 3B, the hairpin tube 11 inserted into a large number of heat radiating fins 12 superposed to complete the heat exchanger 10 is expanded. At this time, by inserting the pressure attachment 8 into the gap 6c provided in the press-fitting board 6, the extension of the telescopic rod 5a of the hydraulic cylinder 5 (arrow C) is performed to the hairpin tube 11 side. Press-in board 6 that moves in the direction (arrow D)
In addition to being able to perform a predetermined pipe expanding operation by the pipe expanding mandrel 7 provided in the
Is escaped by projecting to the other direction (arrow E) through the mandrel escape hole 8a previously formed in the pressing attachment 8 and the escape hole 6a previously formed in the center of the press-fitting board 6 respectively. It can be done.

[0004]

However, the tube expanding device having the above-mentioned conventional structure has the following problems.

That is, in the tube expanding device having the above structure, each of the plurality of tube expanding mandrels having the locking portion 7a on the other end side is inserted and locked through the locking portion 7a so that it can be pulled out in one direction. A pipe to be expanded, which is positioned in one direction of the press-fitting plate 3 through the pair of guide posts 4 and the pair of hydraulic cylinders 5, respectively. A predetermined pipe expanding operation can be performed by reciprocally moving opposite to 11, and the unused mandrel 7 has a pressure attachment 8 which is inserted into a gap 6c provided in the press-fitting board 6 in advance. The mandrel escape hole 8a formed in the center of the press-fitting board 6 and the escape hole 6a formed in the center of the press-fitting board 6 can be projected (arrow E) to the other direction to escape. .

Therefore, each of the pair of guide posts 4 and the pair of hydraulic cylinders 5 inevitably has both ends of the press-fitting plate 6 except for the central portion of the press-fitting plate 6 to which the plurality of pipe expanding mandrels are locked. Will be located on the side.

Accordingly, since the pair of guide posts 4 are located at both ends of the press-fitting plate 6, the reciprocating motion of the press-fitting plate 6 is smoothly performed. Since the hydraulic cylinder 5 and the telescopic rod 5a of the hydraulic cylinder 5 are also attached to both ends of the press-fitting board 6 and avoiding both ends of the press-fitting board 6 where the guide posts 4 are located, the press-fitting board 6 is provided. Width, that is, the width itself of the tube expanding device 1 becomes very large, and not only putting in and out of a factory or the like in which the tube expanding device 1 is installed but also the installation space is limited. In the tube expanding device configured to project the mandrel 7 to the other side of the press-fitting plate 6 and to escape, the expansion and contraction of the hydraulic cylinder 5 on the front and back surfaces of the press-fitting plate 6 having the through locking holes 6b. rod When 5a was attached, the width of the tube expansion device 1 had to be increased.

However, the present invention solves the above-mentioned problems, and in the pipe expanding device having a structure in which an unused mandrel is projected to the other direction side of the press-fitting board and escaped when expanding the pipe, a hydraulic cylinder or the like. The reciprocating means of the press-fitting board is provided on the peripheral surface portion of the press-fitting board except for the front and back surfaces of the press-fitting board in which the through locking holes for locking the pipe expanding mandrel are formed, so that the full width of the press-fitting board itself. It is an object of the present invention to provide a tube expanding device in which the entire space can be reduced to the limit and the installation space can be minimized.

[0009]

The present invention takes the following technical means in order to solve the above problems.

That is, according to the present invention, the expansion billet 7b is provided on one end side.
And a plurality of pipe expanding mandrels 7 each having a locking portion 7a on the other end side, and each of the pipe expanding mandrels 7 is inserted and locked through the locking portion 7a so as to be able to be pulled out in one direction. And a press-fitting board 6 in which a plurality of through locking holes 6b are formed.
The pipe 11 to be expanded, which is positioned in one direction of the press-fitting plate 6.
And a reciprocating means for reciprocating the surface of the press-fitting plate 6, and when the pipe is expanded, an unused pipe expanding mandrel 7 is projected from the press-fitting plate 6 that moves in one direction to the other direction to escape. In the tube expanding device 1 configured as described above, the reciprocating means has the press-fitting plate 6 in which the through locking hole 6b is formed.
The points are provided on the peripheral surface portion 6d of the press-fitting plate 6 excluding the front and back surfaces thereof.

Further, the press-fitting board 6 is attached to the tube expanding device 1.
Is provided with a pair of columns 2 having an axial length direction along the reciprocating direction and having a constant interval, and the reciprocating means is positioned between the pair of columns 2.

Further, the reciprocating means is a hydraulic cylinder 5.
In addition, one end side of the telescopic rod 5a of the hydraulic cylinder 5 is attached to the peripheral surface portion 6d of the press-fitting plate 6.

Further, the hydraulic cylinder 5 is positioned between the pair of columns 2, and the press-fitting plate 6 is moved in the other direction when the telescopic rod 5a is extended.
The point is to move the press-fitting plate 6 in one direction during contraction.

Further, the reciprocating means is composed of a ball screw which can rotate forward and backward and a female screw body or a gear body screwed to the ball screw, and the female screw body or the gear body is attached to the press-fitting plate 6. There is a point.

[0015]

In the tube expanding device having the above structure, the tube expanding mandrels 7 each having the tube expanding billet 7b on one end side and the engaging portion 7a on the other end side, and the tube expanding mandrels 7 respectively. A press-fitting plate 6 having a plurality of through locking holes 6b formed therein so as to be inserted and locked in such a manner that it can be pulled out in one direction via the locking portion 7a, and the press-fitting plate 6 is provided in one direction. And a reciprocating means for reciprocating the pipe 11 to be expanded facing the pipe 11 to be expanded. Further, at the time of pipe expansion, an unused pipe expanding mandrel 7 is moved from a press-fitting plate 6 which moves in one direction to an unused pipe expanding mandrel 7. In the tube expanding device 1 configured to project to the other direction side and escape, the reciprocating means includes the press-fitting plate 6 except for the front and back surfaces of the press-fitting plate 6 having the through locking hole 6b. Peripheral part
Since it is provided in 6d, the entire width of the press-fitting plate 6 can be cut to the limit to minimize the overall width of the pipe expanding device.

Further, the press-fitting board 6 is provided in the pipe expanding device 1.
Since the reciprocating means is positioned between the pair of columns 2 and has the axial length direction along the reciprocating direction of 1, the column 2 is provided with a constant interval. It is possible to minimize the depth (thickness) of the pipe expanding device with the minimum.

Further, the reciprocating means is the hydraulic cylinder 5.
In addition, since one end side of the telescopic rod 5a of the hydraulic cylinder 5 is attached to the peripheral surface portion 6d of the press-fitting board 6, it becomes possible to attach one end side of the telescopic rod 5a to the central portion of the press-fitting board 6. , Even if the number of hydraulic cylinders 5 is reduced from two to one, well-balanced press-fitting board 6
It is possible to reciprocate.

Further, the hydraulic cylinder 5 is positioned between the pair of columns 2, and the press-fitting plate 6 is moved in the other direction when the telescopic rod 5a is extended.
Since the press-fitting plate 6 is moved in one direction during contraction of
The hydraulic cylinder 5 can be reliably housed in the pipe expanding device 1, and the total height of the pipe expanding device 1 can be reliably suppressed within the height of the column.

Further, the reciprocating means is composed of a ball screw which can be rotated normally and reversely and a female screw body or a gear body screwed to the ball screw, and the female screw body or the gear body is attached to the press-fitting plate 6. As a result, not only can the total height of the pipe expanding device 1 be suppressed within the height of the column, but also a pipe expanding device suitable for an environment without an oil temperature control device or noise can be provided.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the structure of the tube expanding device, description of the same parts as in the conventional example will be omitted below.

In FIG. 1, reference numeral 1 is a press-fitting that moves up and down via a pair of guide posts 4 mounted on a beam 3 provided between a pair of columns 2 standing upright with a predetermined interval. 1 shows a tube expanding device equipped with a board 6, and 1a shows a tube expanding device main body.

Reference numeral 9 is a press-fitting plate which is positioned between the columns 2 and is provided with through locking holes 6b for locking the pipe expanding mandrel 7 of the press-fitting plate 6 except for the front and back surfaces 6e of the press-fitting plate 6. 6 shows a press-fitting board connecting body attached to the peripheral surface portion 6d of the hydraulic presser 6, and the press-fitting board connecting body 9 is provided with a hydraulic pressure which is erected between the columns 2 and which is located in the central portion of the press-fitting board 6. The tip of the telescopic rod 5a of the cylinder 5 is attached,
Moreover, since the press-fitting board connecting body 9 raises the press-fitting board 6 when the telescopic rod 5a is extended (in the other direction), and lowers the press-fitting board 6 when the telescopic rod 5a is contracted (in one direction). , Cut the entire width of the press-fit board 6 to the limit (arrow A)
Not only can the overall width of the tube expansion device be minimized,
The hydraulic cylinder 5 can be reliably housed in the tube expanding device 1 so that the total height of the tube expanding device 1 can be reliably suppressed within the height of the column, and the depth (thickness) of the tube expanding device 1 can be minimized. I can.

Further, a telescopic rod is provided at the center of the press-fitting board 6.
Since one end side of 5a is attached, it is possible to reciprocate the press-fitting board 6 in a well-balanced manner even when the number of hydraulic cylinders 5 is reduced from two to one.

In the above embodiment, the reciprocating means is
It consists of a hydraulic cylinder and a press-fitting board connecting body attached to the press-fitting board. For example, instead of the hydraulic cylinder, a ball screw that can be rotated forward and backward via an electric motor is used, and a female screw body or a gear screwed to the ball screw. It may be a reciprocating means consisting of a structure in which a body is attached to the press-fitting board connection body or the press-fitting board, and in this case, not only can the total height of the tube expanding device be reliably suppressed within the height of the column, There is an advantage that it is possible to provide an oil temperature control device and a pipe expanding device suitable for an environment free of noise and the like.

Further, in the above-described embodiment, the hydraulic cylinder is erected between the pair of columns so as to raise the press-fitting plate when the telescopic rod is extended and lower the press-fitting plate when the telescopic rod is contracted. As shown in FIG. 2 (a),
As shown in FIG. 5, they may be provided in an inverted state between the columns, and in this case, only the entire width of the tube expanding device can be minimized.

Further, in the above-mentioned embodiment, the press-fitting board has a pipe expanding billet on one end side and a plurality of pipe expanding mandrels each having a locking portion on the other end side in one direction via the locking portion. A plurality of through locking holes are drilled so that it can be inserted and locked so that it can be pulled out, and when the pipe is expanded, the unused mandrel is drilled in the pressure attachment that is inserted into the gap provided in the press-fitting board in advance. The mandrel escape hole provided and the escape hole pre-drilled in the center of the press-fitting plate can be projected to the other direction to escape, for example, as shown in FIG. As shown in FIG. 5, a shield 8b that can reciprocate on the press-fitting plate 6 via the cylinder 13 is provided above the engaging portion 7a of the pipe expanding mandrel 7, that is, in the gap 6c of the press-fitting plate 6. Well, in this case, each of the pipe expanding mandrels 7 is connected to a different type of heat exchanger. In correspondence to the tube pattern has can benefit be changed instantaneously.

Further, in the above embodiment, the tube expanding device is
It consists of a so-called vertical expansion device with a column erected,
It is not necessarily limited to the vertical pipe expanding device, and may be a horizontal pipe expanding device in which the press-fitting board reciprocates in the horizontal direction, and other specific attachments such as voids for inserting / attaching the pressure attachment or the press-fitting board. The specific configurations such as the shape, the forming means, and the like can be arbitrarily modified within the scope intended by the present invention.

[0028]

As described above, according to the present invention, a plurality of pipe expanding mandrels having a pipe expanding billet at one end and a locking portion at the other end and a plurality of pipe expanding mandrels are provided. A press-fitting board in which a plurality of through locking holes are formed so as to be inserted and locked so that it can be pulled out in one direction via a stopper, and a pipe to be expanded which is positioned in the press-fitting board in one direction. And a reciprocating means for reciprocating while facing each other, and when expanding the pipe,
In a pipe expanding device having a structure in which an unused pipe expanding mandrel is projected from the press fitting plate moving in one direction to the other direction side of the press fitting plate to escape, the reciprocating means includes the through locking. Since the holes are provided in the peripheral surface portion 6d of the press-fitting board except the front and back surfaces of the press-fitting board in which the holes are formed, the entire width of the press-fitting board can be cut to the limit to minimize the total width of the tube expanding device.

Further, the tube expanding device is provided with a pair of columns having an axial length direction along the reciprocating direction of the press-fitting board and having a constant interval, and the reciprocating means includes the pair of columns. Since it is positioned between the columns, the depth (thickness) of the tube expanding device having the smallest overall width can be minimized.

Further, since the reciprocating means is composed of a hydraulic cylinder, and one end side of the telescopic rod of the hydraulic cylinder is attached to the peripheral surface portion of the press-fitting board, one end side of the telescopic rod is attached to the central portion of the press-fitting board. Even if the number of hydraulic cylinders is reduced from two to one, it is possible to reciprocate the press-fitting board with good balance.

Further, the hydraulic cylinder is positioned between a pair of columns and moves the press-fitting board in the other direction when the telescopic rod is extended, and the press-fitting board is moved in one direction when the telescopic rod is contracted. Since the hydraulic cylinder is moved, the hydraulic cylinder can be reliably housed in the pipe expanding device, and the total height of the pipe expanding device can be reliably suppressed within the height of the column.

Further, the reciprocating means is composed of a ball screw which can be rotated normally and reversely, and a female screw body or a gear body screwed to the ball screw, and the female screw body or the gear body is attached to the press-fitting board. Therefore, not only the total height of the pipe expanding device can be suppressed within the height of the column, but also a pipe expanding device suitable for an environment without oil temperature control device and noise can be provided.

Therefore, when the pipe is expanded, an unused mandrel is
In a pipe expanding device configured to project to the other side of the press-fitting plate and escape, a reciprocating means of the press-fitting plate such as a hydraulic cylinder is provided with a through locking hole for locking the pipe expanding mandrel. By being provided on the peripheral surface of the press-fitting board excluding the front and back surfaces of the press-fitting board, it is possible to cut down the entire width of the press-fitting board itself to the limit, and thus the installation space is minimized and the entire expansion tube is compact. It has come to have a special effect that a device can be provided.

[Brief description of drawings]

FIG. 1 shows a tube expanding device according to the present invention, in which FIG. 1A is an enlarged side view of an essential part, and FIG. 1B is an enlarged front view of an essential part.

2A and 2B show another embodiment of the tube expanding device of the present invention, in which FIG. 2A is a side view and FIG. 2B is an enlarged side view of a main part of a press-fitting board.

FIG. 3 shows a conventional tube expanding device, and FIGS. 3 (A) and 3 (B) are front views.

[Explanation of symbols]

 1 ... Tube expansion device 1a ... Tube expansion device main body 2 ... Column 3 ... Beam body 4 ... Guide post 6 ... Press-fitting board 8 ... Press attachment 10 ... Heat exchanger

Claims (5)

[Claims] 1. A plurality of tube expanding mandrels having a tube expanding billet (7b) at one end and a locking portion (7a) at the other end.
(7) and the pipe expanding mandrel (7), respectively.
A press-fitting board (6) having a plurality of through locking holes (6b) formed therein so as to be inserted and locked so that it can be pulled out in one direction via a), and the press-fitting board.
(6) is equipped with a reciprocating means for reciprocating the pipe (11) positioned in one direction of the press-fitting plate (3) and facing the pipe (11) to be expanded. (6) A pipe expanding device configured such that an unused pipe expanding mandrel (3) is projected toward the other side of the press-fitting board (6) to escape.
In (1), the reciprocating means is the through locking hole (6b).
The press-fitting board (6) except for the front and back surfaces of the press-fitting board (6) in which
A pipe expanding device characterized in that it is provided on the peripheral surface portion (6d) of the. 2. The press-fitting board (6) for the tube expanding device (1).
A pair of columns (2) having an axial length direction along the reciprocating direction of the column and having a constant interval, and the reciprocating means being positioned between the pair of columns (2). Item 1. The tube expanding device according to item 1. 3. The reciprocating means comprises a hydraulic cylinder (5), and the telescopic rod (5a) of the hydraulic cylinder (5).
The pipe expanding device according to claim 1 or 2, wherein one end side of the pipe is attached to a peripheral surface portion (6d) of the press-fitting plate (6). 4. The hydraulic cylinder (5) is positioned between a pair of columns (2), and when the telescopic rod (5a) is extended, the press-fitting plate (6) is moved in the other direction, and the telescopic rod (5) is expanded and contracted. The tube expanding device according to claim 3, wherein the press-fitting plate (6) is configured to move in one direction when the rod (5a) is contracted. 5. The reciprocating means comprises a ball screw rotatable forward and backward, and a female screw body or a gear body screwed to the ball screw, and the female screw body or the gear body is the press-fitting board.
The tube expanding device according to claim 1 or 2, which is attached to (6).