JPH06246376A - Expanding device - Google Patents

Abstract

PURPOSE:To simply and surely hold a heat exchanger by providing an elastic receiver in order to receive a tube of the heat exchanger being energized in a moving direction of a reciprocating hydraulic fluid due to forcibly pressing a mandrel inserted in the reciprocating hydraulic fluid in a time expanding a tube of the heat exchanger through the reciprocating hydraulic fluid in a heat exchanger holding unit CONSTITUTION:Because an elastic receiver 7b in order to receive a tube 14 of a heat exchanger 16a is provided in a heat exchanger holding stand 7, the heat exchanger l6a can instantly and surely be held with plural numbers of pressurizing plates 2c by corresponding to the total height of the heat exchanger 16a even in a case where the total height of the heat exchanger 16a in a penetrating direction of a tube 14 penetrated in plural numbers of heating fins composing the heat exchanger 16a is absolutely different due to the kind of the heat exchanger 16a, and together the heat exchanger 16a can be held by simply and surely receiving a lower end part 14a of the tube 4 with the elastic receiver 7b even in a case Where an outer diameter of the tube 14, an inserting place or a pitch, etc., are successively different due to the kind of the heat exchanger 16a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger tube expanding device,
More specifically, the present invention relates to a pipe expanding device for integrally fixing a large number of heat radiation fins and a plurality of pipes constituting a heat exchanger by expanding the pipes.

[0002]

2. Description of the Related Art Conventionally, as a pipe expanding apparatus of this type, for example, as shown in FIG. 7 (a), a plurality of pipe expanding mandrels 10 are inserted into a reciprocating body 9 which can reciprocate through a cylinder 8. A stripper plate 11 provided with a stripper 11a for determining the projection length of the pipe at the time of pipe expansion is provided below the reciprocating body 9 so as to be reciprocally movable in conjunction with the reciprocating body 9. There is a tube expansion device 12.

That is, in the tube expanding device 12 having the above-mentioned structure, a plurality of hair expanding tubes 14 for expanding tubes are formed below the stripper plate 11 and a plurality of heat dissipating fins 13 each have a lower end 14a formed in a substantially U shape. A desired end plate 15 is provided at both ends of the heat radiation fin 13 having the tubes 14 inserted in the same direction as the rows.
The heat exchanger 16 formed with a and 15b is
The lower end portion 14a of the hairpin tube 14 for expanding the tube which is inserted through 16 is held through a plurality of insertable receivers 17, and the reciprocating body 9 is inserted through the cylinder 8.
By lowering, as shown in the same figure (b), the pipe expanding mandrel 10 is press-fitted into the pipe 14 to expand the pipe 14,
The end plates 15a and 15b, the plurality of heat radiation fins 13 and the tube 14 can be integrally fixed to each other.

[0004]

However, the conventional tube expanding device described above has the following problems.

That is, in the conventional tube expanding device, the tube expanding mandrel 10 inserted into the reciprocating body 9 is press-fitted into the plurality of tubes 14 inserted into the heat exchanger 16 to expand the tubes 14. It is a thing.

Therefore, the pipe expanding mandrel 10 is placed in the pipe 14.
When is press-fitted, strain is generated in the entire heat exchanger as the pipe 14 is expanded.

Therefore, in order to prevent distortion of the heat exchanger 16 during pipe expansion, the heat exchanger 16 is held in a direction intersecting with the reciprocating direction of the reciprocating body 9 so that the heat exchanger 16 during pipe expansion is expanded. Although it is possible to prevent the distortion of the heat exchanger 16 to some extent, the total height of the heat exchanger 16 in the insertion direction of the tubes 14 inserted into the plurality of heat radiation fins 13 constituting the heat exchanger 16 is Since there are many variations depending on the type, there has been a very serious problem that a heat exchanger holding body capable of supporting all heat exchangers 16 having different heights is required.

Further, the heat exchanger 16 to be expanded through the tube expanding device having the above-mentioned structure has a plurality of hairpin tubes 14 for expanding, each of which has a plurality of heat dissipating fins 13 having a lower end 14a formed in a substantially U shape. Although they are inserted in the same row, depending on the type of the heat exchanger 16, the outer diameter of the hairpin tube 14 for expanding, which is inserted into the plurality of heat radiation fins 13, the insertion location, the pitch, etc. may be slightly different. There is also.

Therefore, as described above, the plurality of radiation fins 13
When the outer diameter, the insertion position, the pitch, etc. of the hairpin tube 14 for expanding the tube to be inserted into the hairpin tube 14 are different from each other, as shown in FIG. 8, the lower end portion 14a formed in a substantially U shape of the hairpin tube 14 is inserted. By doing so, not only the replacement work of the receiver 17 holding the heat exchanger 16 via the hairpin tube 14 is required, but also the outer diameter of the hairpin tube 14 into which the receiver 17 itself is inserted, the insertion point or the pitch, etc. Therefore, many kinds and a large amount must be prepared, which causes serious problems such as high cost of the receiver 17 and reduction of operating rate through the replacement work.

Therefore, the present invention solves all the above problems, and the total height of the heat exchanger in the insertion direction of the tubes inserted through the plurality of heat radiation fins constituting the heat exchanger is the same. Even if it is completely different depending on the type of the heat exchanger, not only can the heat exchanger be pinched instantaneously and accurately to completely prevent distortion of the heat exchanger at the time of pipe expansion, but also the heat exchanger. Even if the outer diameter of the hairpin tube inserted through, the insertion point, the pitch, or the like varies sequentially depending on the type of heat exchanger, the heat exchanger can be easily and reliably received by receiving the lower end portion of the hairpin tube. It is an object of the present invention to provide an extremely excellent tube expanding device that can be held.

[0011]

That is, according to the present invention, a heat exchanger held by a heat exchanger holder 7 is installed in a tube expanding device main body 1.
At least a pair of heat exchanger sandwiching bodies capable of sandwiching the heat exchanger 16a in a direction intersecting the reciprocating direction of the reciprocating body 9 when the reciprocating body 9 is positioned to face the reciprocating body 9. The heat exchanger sandwiching device 2 is provided, and a plurality of heat exchanger sandwiching bodies provided in the heat exchanger sandwiching device 2 are provided along a direction intersecting the reciprocating direction of the reciprocating body 9. The pressing plates 2c are provided in a multi-stage manner, and the heat exchanger sandwiching member is configured so that the intervals between the pressing plates 2c adjacent to each other can be expanded and contracted in the direction along the reciprocating direction of the reciprocating body 9. A pressure plate interval adjusting device 3 is provided, and is inserted into and attached to the heat exchanger holding base 7 when the heat exchanger 16a is expanded through the reciprocating body 9. Movement of the reciprocating body 9 by press fitting the mandrel 10 Lies in the elastic receiver 7b for receiving the tube 14 of the heat exchanger 16a is biased in the direction provided.

[0012]

In the tube expanding device having the above-described structure, when the heat exchanger 16a held on the heat exchanger holder 7 is positioned so as to face the reciprocating body 9, the reciprocating body 9 is moved. A heat exchanger sandwiching device 2 having at least a pair of heat exchanger sandwiching bodies capable of sandwiching the heat exchanger 16a in a direction intersecting the reciprocating direction is provided, and provided in the heat exchanger sandwiching device 2. The heat exchanger sandwiching body includes a plurality of pressing plates 2c along a direction intersecting the reciprocating direction of the reciprocating body 9.
Is provided in a multi-stage manner, and in the heat exchanger sandwiching body, a space between pressing plates 2c adjacent to each other can be expanded and contracted in a direction along the reciprocating direction of the reciprocating body 9. The adjusting device 3 is provided, and the mandrel 10 inserted into the reciprocating body 9 is expanded on the heat exchanger holding base 7 when the heat exchanger 16a is expanded through the reciprocating body 9. Since the elastic receiver 7b for receiving the tube 14 of the heat exchanger 16a which is urged in the moving direction of the reciprocating body 9 by the press-fitting of the heat exchanger is provided,
Even if the total height of the heat exchanger 16a in the insertion direction of the pipe 14 inserted into the plurality of heat radiation fins 13 that compose 16a is completely different depending on the type of the heat exchanger 16a, the heat exchanger 16a
Corresponding to the total height of the heat exchanger 16a
Can be securely held by a plurality of pressing plates 2c, and the outer diameter of the pipe 14 inserted into the heat exchanger 16a,
Even when the insertion location, pitch, etc. are successively different depending on the type of the heat exchanger 16a, the lower end portion 14a of the pipe 14 is simply and surely received by the elastic receiver 7b and the heat exchanger 16a.
Can hold.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

With respect to the structure of the tube expanding device according to the embodiment of the present invention, the description of the same parts as those of the conventional tube expanding device will be omitted below.

In FIG. 1, reference numeral 1 denotes a main body of the pipe expanding device which is erected on a base 1a via columns 1b.

Reference numeral 2 denotes a heat exchanger holder 7 which is provided at a lower portion of the tube expanding apparatus main body 1 and moves on a transfer rail 7a which is laid so as to pass under the tube expanding apparatus main body 1 from one to the other. For example, a heat exchanger holding body configured by a front presser guide 2a and a rear presser guide 2b for holding a single-row heat exchanger 16a held and sequentially conveyed is held in the front-rear direction of the heat exchanger 16a. 1 shows a heat exchanger holding device provided.

The front pressing guide 2a, which is one of the heat exchanger holding bodies of the heat exchanger holding device 2, is a guide rail 6 laid so as to extend to the front side of the base 1a of the tube expanding device body 1. The upper part is provided so as to be movable (arrow A) so as to face the front surface of the main body 1 of the pipe expanding device, and the front pressing guide is provided.
A plurality of cylinders 5 are provided in the rear surface pressing guide 2b and the rear surface pressing guide 2b, and a combination of the plurality of cylinders 5 intersects the reciprocating direction of the reciprocating body 9, that is, the front and rear of the tube expanding device body 1. A pressing plate (2c) that can project in a direction along the direction is provided in multiple stages.

Further, as shown in FIG. 2A, each of the cylinders 5 from which the pressing plate 2c is projected has a predetermined interval between the case bodies 5a provided with the cylinders 5 and adjacent to each other. In order to be able to expand and contract at intervals, a rod body 4 having a predetermined length and a cylinder locking body 4a attached to the rod body 4 at a predetermined interval are connected in multiple stages so that they can be suspended. It becomes.

Further, in the same figure (b),
The case body 5a on the one end side, which is connected so that it can be suspended, is provided with an electric motor 3a and a speed reducer 3b, and is connected in multiple stages via a spiral rod 3c that is vertically or hung at a predetermined position. A pressing plate interval adjusting device 3 for automatically expanding and contracting the intervals between the case bodies 5a (arrow B) is formed.

Further, as shown in FIG. 3, an elastic receiver 7b formed in the shape of a rectangular parallelepiped through a synthetic rubber having hardness (JIS) 60 to 75 is formed on the upper surface of the heat exchanger holder 7. The elastic receiver guide body 7d having a substantially L-shaped cross section, which is laid facing the upper surface portion, is detachably provided by slidingly inserting a concave groove portion 7e formed in the longitudinal direction of the elastic receiver 7b. In addition, the upper surface 7c of the elastic receiver 7b has a size capable of simultaneously mounting the substantially U-shaped lower end portions 14a of the hairpin tubes 14 for pipe expansion inserted into the heat radiation fins 13 of the heat exchanger 16a. It has.

The tube expanding device in this embodiment has the above-mentioned structure, but the total height of the heat exchanger and the outer diameter of the inserted hairpin tube, the insertion point, the pitch, etc. are different through the tube expanding device. The case of expanding the tube of the heat exchanger will be described.

First, referring to FIG. 1 and FIG. 2 (a), the descending dimensions of the reciprocating body 9 and the stripper plate 11 according to the product number, type, etc. of the heat exchanger for expanding the pipe in advance are described as follows.
It is stored in the central processing unit (not shown) in the automatic control device (not shown) provided in the tube expanding device body 1.

Next, as shown in FIG. 2B, at the time of pipe expansion, for example, the product number of the heat exchanger 16b having a height higher than that of the standard length heat exchanger 16a is specified by the automatic control device (not shown). ), A pressing plate provided adjacent to both pressing guides of the heat exchanger holding body via the automatic control device (not shown) and the pressing plate interval adjusting device 3.
The intervals of 2c can be automatically expanded (arrow C) and the pressing plates can be set at predetermined positions at intervals corresponding to the total height of the heat exchanger 16b.

Then, as shown in FIG. 4 (a), the heat exchanger 16a is passed through the elastic receiver 7b on the transfer rail 7a laid so that it can pass from the lower side of the tube expanding device main body 1 to the other side. The heat exchanger holder 7, which is held by the above, is conveyed (arrow D) to a position right below the reciprocating body 9 (not shown) and the stripper plate 11 (not shown) provided in the main body 1 of the tube expanding device, and a predetermined length Pause mechanism (not shown)
Will be positioned through.

Next, the heat exchanger 9 positioned directly below the reciprocating body 9 (not shown) and the stripper plate 11 (not shown) is heated by the heat exchanger 9 as shown in FIG. The pressing plate 2c can be reliably held by the protrusion of the cylinder 5 provided on the front pressing guide 2a and the rear pressing guide 2b of the device holding device 2 by the extension (arrow E) of the cylinder 5.

Therefore, by lowering the reciprocating body 9 in the state of being positioned as described above, the reciprocating body 9 is moved.
Each of the mandrels 10 attached to the heat exchanger 16a
The hairpin tubes 14 inserted through the heat radiation fins 13 can be press-fitted to perform reliable tube expansion without distortion, and the mandrel 10 can be press-fitted to move the reciprocating body 9 as shown in FIG. By receiving each of the lower end portions 14a of the hairpin tubes 14 of the heat exchanger 16a biased in the direction (arrow F) through the cave deformation (arrow G) having the resilience of the elastic receiver 7b, The hairpin tube 14 has no relation to the diameter of the lower end 14a of the hairpin tube 14 or the insertion position or pitch.
Can be held reliably.

Therefore, even if the total height of the heat exchanger in the insertion direction of the tubes inserted through the plurality of heat radiation fins constituting the heat exchanger differs depending on the type of the heat exchanger, Also, by securely holding the heat exchanger through the pressing plate so as to correspond to the entire height of the heat exchanger, it is possible to prevent the heat exchanger from being distorted during pipe expansion and to insert the heat exchanger into the heat exchanger. Even if the outer diameter, the insertion point, the pitch, etc. of the hairpin tube are sequentially changed depending on the type of the heat exchanger, the hairpin tube is simply and surely received to hold the heat exchanger. Can be done.

In the above embodiment, the heat exchanger for expanding the pipe is provided at the lower part of the main body of the expansion device and is laid so that it can pass from one side to the other below the main part of the expansion device. The heat exchanger is held on a heat exchanger holder that moves on the transfer rails and sequentially conveyed, but the point is that the heat exchanger is positioned so as to face the reciprocating body provided in the main body of the pipe expanding device. It is not necessary for the heat exchanger holder to move on the transfer rail laid freely below the main body of the pipe expanding device to be sequentially conveyed, and for example, the pipes are sequentially conveyed from the front of the pipe expanding device and the pipe expanding. The heat exchanger holder may be held by a heat exchanger holder which is configured to recede in the forward direction of the tube expanding device later, or the heat exchanger holder may be fixed below the reciprocating body. .

Further, in the above embodiment, the elastic receiver is provided on the upper surface of the heat exchanger holder and has hardness (JIS) 6
It is formed in a rectangular parallelepiped shape through a synthetic rubber having 0 to 75, and the kind of the synthetic rubber is styrene-butadiene rubber,
Acrylonitrile butadiene rubber, chloroprene rubber,
Not limited to ethylene propylene, fluororubber, polysulfide rubber, etc., and hardness (JIS) etc. are not essential,
Further, the elastic receiver may be made of natural rubber. In short, the lower end of the hairpin tube of the heat exchanger, which is urged in the moving direction of the reciprocating body by the press-fitting of the mandrel, has a cavitational deformation with resuscitation force. The elastic receiver faces the hairpin tube as long as it can securely hold the hairpin tube regardless of the diameter of the lower end portion of the hairpin tube, the insertion pattern, the pitch, etc. Therefore, the elastic receiver may be provided with a multilayer structure in which the upper portion is soft and the lower portion is hard, and the specific material, quantity, and shape of the elastic receiver, and deterioration in use of the elastic receiver. Needless to say, the attachment / detachment means at the time of replacement is not limited.

Further, in the above-described embodiment, the heat exchanger holding device is constituted by a front pressing guide and a rear pressing guide for holding the heat exchanger positioned in the tube expanding device main body in the front-back direction of the heat exchanger. A heat exchanger holding device having a body is provided, and the former front pressing guide faces the front surface of the tube expanding device body on a guide rail laid so as to extend to the front side of the base of the tube expanding device body. It is provided so that it can move freely
And, the front pressing guide and the rear pressing guide,
A plurality of pressing plates protruding in a direction intersecting the reciprocating direction of the reciprocating body by a combination of a plurality of cylinders are provided in a multi-stage manner. The point is that a direction intersecting the reciprocating direction of the reciprocating body is essential. Is provided with a heat exchanger sandwiching device including at least a pair of heat exchanger sandwiching bodies capable of sandwiching the heat exchanger, and the heat exchanger sandwiching body intersects the reciprocating direction of the reciprocating body. A plurality of pressing plates are provided in a multi-stage manner along the direction, and the space between the pressing plates adjacent to each other in the heat exchanger sandwiching body can be expanded and contracted in the direction along the reciprocating direction of the reciprocating body. If a pressure plate spacing adjustment device to be provided is provided,
The pressing plate provided on the front pressing guide and the rear pressing guide constituting the heat exchanger holding body does not necessarily have to project in a direction intersecting the reciprocating direction of the reciprocating body by a combination of a plurality of cylinders, It goes without saying that each of the pressing plates may be provided on the front pressing guide and the rear pressing guide in a planar manner, and both pressing guides may be provided so as to be able to come into contact with and separate from each other so as to directly hold the heat exchanger. Further, as shown in FIG. 6, a plurality of the pressing plates may be provided along the longitudinal direction of the heat exchanger.

Further, in the above-mentioned embodiment, in the heat exchanger holding body, the intervals of the multi-stage pressing plates can be expanded and contracted in the direction along the reciprocating direction of the reciprocating body. The pressure plate interval adjusting device for this is provided via an electric motor, a speed reducer, a spiral rod, and the like, but the point is that the pressure plates provided in multiple stages to securely hold heat exchangers with different overall heights. The pressing plate interval adjusting device may not necessarily be provided via an electric motor, a speed reducer, a spiral rod, or the like as long as each interval can be expanded and contracted, and for example, a rack and a pinion, a lever can be used. A combination of a mechanism, a cylinder and the like may be used, and the specific expansion / contraction mechanism of the pressing plate interval adjusting device, the number, the mounting location, etc. are not limited.

Further, in the above embodiment, one of the front holding guides of the two holding guides constituting the heat exchanger holding body is
The guide rail laid so as to extend to the front side of the base of the tube expanding apparatus main body is movably provided so as to face the front surface of the tube expanding apparatus main body. As long as it can be held, for example, both presser guides are rotatably provided on the base to hold the heat exchanger, or both presser guides can face each other and be separated from each other. The configuration may be such that the heat exchanger holding body is moved to any position, and the specific shape, mechanism, quantity, attachment position, etc. of the heat exchanger holding body are not limited.

Further, in the embodiment, the pipe expanding device is a so-called vertical pipe expanding device which is erected through the columns which are erected on the base, but the essential point is that a plurality of pipe expanding mandrels are A reciprocating body inserted into the plurality of tubes to be expanded provided in the exchanger so as to be press-fittable; and a reciprocating mechanism for reciprocating the reciprocating body to expand the plurality of tubes. Needless to say, a horizontal tube expanding apparatus may be used as long as it is provided, and the specific shape, mechanism, configuration, etc. of the tube expanding apparatus are by no means limited.

However, the specific configurations of the heat exchanger holding device and the pressing plate interval adjusting device according to the present invention such as quantity, shape, installation location, drive mechanism, etc. are all within the scope intended by the present invention. Design can be changed freely.

[0035]

As described above, according to the present invention, when the heat exchanger held by the heat exchanger holder is positioned in the tube expansion device body so as to face the reciprocating body, the reciprocating operation is performed. There is provided a heat exchanger sandwiching device including at least a pair of heat exchanger sandwiching bodies capable of sandwiching the heat exchanger in a direction intersecting with the reciprocating direction of the body, and the heat exchanger sandwiching device provided with the heat exchanger sandwiching device. The heat exchanger sandwiching body is provided with a plurality of pressing plates in a multi-stage manner along a direction intersecting with the reciprocating direction of the reciprocating body, and the heat exchanger sandwiching body is adjacent to each pressing plate. Is provided with a pressing plate interval adjusting device that allows expansion and contraction of each of the intervals in a direction along the reciprocating motion of the reciprocating body, and the heat exchanger holder is provided with the reciprocating body through the reciprocating body. Of the reciprocating body when expanding the heat exchanger Since the elastic receiver for receiving the tube of the heat exchanger, which is urged in the moving direction of the reciprocating body by the press-fitting of the attached mandrel, is provided, the plurality of radiating fins constituting the heat exchanger are provided. Even if the total height of the heat exchanger in the insertion direction of the inserted tube is completely different depending on the type of the heat exchanger, the heat exchanger can be instantly and reliably connected to the total height of the heat exchanger. The exchanger can be securely held by a plurality of pressing plates,
Even if the outer diameter of the tube inserted into the heat exchanger, the insertion location, the pitch, etc. are sequentially different depending on the type of heat exchanger, the lower end of the tube is easily and surely received by the elastic receiver. Can hold the exchanger.

Further, in the case where each of the pressing plates is provided so as to be able to project through the expansion / contraction means, the width of the heat exchanger mounted on the holding table positioned with a predetermined width. Even when the heat exchangers are different from each other depending on the type of the heat exchanger or a predetermined product number, the heat exchanger can be surely held by the protrusion of the pressing plate.

Therefore, even if the total height of the heat exchanger in the insertion direction of the tubes inserted through the plurality of heat radiation fins constituting the heat exchanger varies depending on the type of the heat exchanger, Further, by securely holding the heat exchanger through the pressing plate so as to correspond to the entire height of the heat exchanger, distortion of the heat exchanger at the time of pipe expansion can be completely prevented, and at the same time, the heat exchanger can be prevented. Even if the outer diameter, the insertion location, the pitch, etc. of the pipe inserted into the pipe are successively different depending on the type of the heat exchanger, the bottom end of the pipe is received easily and securely to hold the heat exchanger. Therefore, not only is it necessary to replace the receiver as in the past, but also a large amount of receiver itself is unnecessary due to the outer diameter of the pipe to be inserted, the insertion point or the pitch, etc. Also came to have.

[Brief description of drawings]

FIG. 1 shows a pipe expanding device according to an embodiment of the present invention, in which FIG. 1 (a) is a front view and FIG. 1 (b) is a side view.

2A and 2B show a pressing plate interval adjusting device of a tube expanding device in the present embodiment, FIG. 2A is an enlarged side view before operation, and FIG. 2B is an enlarged side view during operation.

FIG. 3 is a perspective view showing an attached state of an elastic receiver in the present embodiment.

FIG. 4 shows a heat exchanger holding device according to the present embodiment. FIG. 4A is a plan view before holding the heat exchanger, and FIG. 4B is a plan view after holding the heat exchanger.

FIG. 5 is a perspective view showing a state when the elastic receiver according to the present embodiment is expanded.

FIG. 6 is a plan view showing another embodiment of the heat exchanger holding device.

FIG. 7 shows a conventional tube expanding device, in which FIG.
The same figure (b) is a partially enlarged sectional view of the heat exchanger at the time of pipe expansion.

FIG. 8 is a perspective view showing a state when the receiver is replaced in the conventional tube expanding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tube expansion device main body 2 ... Heat exchanger holding device 2c ... Pressing plate 3 ... Pressing plate interval adjusting device 7 ... Heat exchanger holder 7b ... Elastic receiver

Claims (4)

[Claims] 1. A reciprocating body (9) in which a plurality of pipe expanding mandrels (10) are press-fitted into a plurality of pipes (14) to be expanded provided in a heat exchanger (16a), In a tube expanding device having a reciprocating mechanism for expanding and reciprocating the plurality of tubes (14) by reciprocating the reciprocating body (9), the tube expanding device body (1)
The heat exchanger (16a) held on the heat exchanger holder (7).
Is positioned facing the reciprocating body (9),
A heat exchanger sandwiching device (2) having at least a pair of heat exchanger sandwiching bodies capable of sandwiching the heat exchanger (16a) in a direction crossing the reciprocating direction of the reciprocating body (9) is provided, Further, in the heat exchanger sandwiching body provided in the heat exchanger sandwiching device (2), a plurality of pressing plates (2c) are provided in a multi-stage along a direction intersecting the reciprocating direction of the reciprocating body (9). Of the pressing plates (2c) adjacent to each other in the heat exchanger sandwiching body, and the expansion and contraction of the pressing plates (2c) can be expanded and contracted in the direction along the reciprocating direction of the reciprocating body (9). A plate gap adjusting device (3) is provided, and the heat exchanger holding base (7) is adapted to reciprocate when the heat exchanger (16a) is expanded through the reciprocating body (9). The tube (14) of the heat exchanger (16a) is urged in the moving direction of the reciprocating body (9) by press fitting the mandrel (10) inserted into the body (9). A tube expanding device comprising an elastic receiver (7b) for receiving. 2. The tube expanding device according to claim 1, wherein each of the pressing plates (2c) is provided so as to be capable of projecting through expansion / contraction means. 3. The tube expanding device according to claim 1, wherein the elastic receiver (7b) is made of rubber. 4. The tube expanding device according to claim 1, wherein the elastic receiver (7b) is detachably provided on the heat exchanger holder (7).