JPH0619945U - Tube expansion device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is for pipe expansion unnecessary for pipe expansion work even when a plurality of mandrels are press-fitted into the pipe inserted through the heat exchanger by the movement of the reciprocating body. Appropriate expansion of pipe by stopping and holding the mandrel at a predetermined position without abutting against the end plate of the heat exchanger or a pipe that does not require pipe expansion inserted into the heat exchanger. It is intended to provide a pipe expanding device which is capable of carrying out the above-mentioned work, has extremely excellent workability, and has extremely high production efficiency. The main body of the tube expanding device is provided with a stripper that determines the protruding length of the tube protruding from the heat exchanger when the tube is expanded by the forward movement of the reciprocating body, and reciprocates along the reciprocating direction of the reciprocating body. A stripper plate that moves is provided, and on the stripper plate, a pipe expanding mandrel that opposes a pipe that does not require expansion and that moves forward through the reciprocating body is reciprocated without contacting the pipe that does not require expansion. It is characterized in that a mandrel holding device for retracting the operating body in a direction opposite to the moving direction and stopping and holding the operating body at a predetermined position is integrally provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is mainly directed to a pipe expanding device for a heat exchanger, and more specifically, a pipe expanding for inserting a plurality of heat radiating fins into a pipe by press-fitting a pipe expanding mandrel so as to be integrally fixed to the radiating fins. Regarding the device.

[0002]

[Prior art]

 Conventionally, as a pipe expanding device of this type, for example, as shown in FIG. 6, it is reciprocally movable via cylinders 4 and has a substantially rectangular shape having a substantially rectangular through hole 5b in its central portion. On the lower surface 5a of the reciprocating body 5, there is provided a mandrel locking body 5c into which a plurality of pipe expanding mandrels 6 having locking heads 6a are inserted, and the mandrel locking body 5c and the reciprocating member 5c are provided. A push attachment 5d which is insertable and removable for pressing the locking head 6a of the pipe expanding mandrel 6 is inserted between the operating body 5 and the reciprocating operating body 5 below the reciprocating operating body 5. The stripper plate 7 is provided with a stripper 7a that determines the projecting length of the pipe 9 at the time of expanding the pipe. Below the stripper plate 7, a plurality of heat radiation fins 8 are provided, and the lower end portion is substantially U-shaped 9a. The pipes 9 to be expanded, which are formed in In addition, a pipe expanding device 13 having a structure in which a heat exchanger 11 having end plates 10a and 10b attached to both ends of a radiation fin 8 having the pipe 9 inserted therethrough is mounted via a plurality of receivers 12 is provided. It exists and is used appropriately.

That is, in the tube expanding device 13 having the above-described configuration, the pattern corresponding to the tube 9 to be expanded can be formed to press the locking head 6a of the tube expanding mandrel 6 during tube expansion. By inserting the possible pressure attachment 5d into the mandrel locking body 5c provided on the lower surface 5a of the reciprocating body 5, and then lowering (advancing) the reciprocating body 5 toward the heat exchanger 11. The pipe expanding mandrel 6 inserted into the reciprocating body 5 is press-fitted into the pipe 9 to be expanded, and the end plates 10a and 10b and the plurality of heat radiation fins 8 are integrated by the pipe expanding. It can be fixed to.

[0004]

[Problems to be solved by the device]

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

That is, in the above-described conventional tube expanding device, the mandrel is press-fitted into the tube of the heat exchanger to expand the tube, so that the end plate and the plurality of heat radiation fins are integrated through the tube. It can be fixed, but depending on the type of heat exchanger, there are some differences in the arrangement pattern of the tubes inserted through the radiating fins, tubes that do not require expansion, and the like.

Therefore, when the plurality of mandrels are press-fitted into a pipe to be expanded of a heat exchanger having a different arrangement pattern or a pipe not requiring expansion, the reciprocating body and the mandrel are to be inserted. Even if the reciprocating body is lowered by providing a through hole 5e for the escape of the mandrel facing the tube not requiring expansion, the pressing attachment inserted between the locking body and the tube does not require expansion. The locking mandrel that abuts on the pipe is projected (arrow A) from the upper surface of the reciprocating body to prevent the expansion mandrel from being press-fitted into a pipe that does not require expansion. .

However, when the tip of the pipe expanding mandrel comes into contact with at least one of the end plate and the tube of the heat exchanger due to the lowering of the reciprocating body, the tip of the pipe expanding mandrel or the heat exchanger. Etc. may be damaged.

Therefore, since the mandrel for pipe expansion or the members of the heat exchanger and the like must be replaced each time, the replacement work and the like are not only very complicated, but also the production efficiency is reduced. There was a problem.

Therefore, the present invention solves all the above problems, and in the case where a plurality of mandrels are press-fitted into a pipe inserted into a heat exchanger by the movement of the reciprocating body. However, the pipe expanding mandrel, which is not necessary for pipe expanding work, should be stopped and held at a predetermined position without being brought into contact with the end plate of the heat exchanger or the pipe that does not require pipe expansion inserted into the heat exchanger. Therefore, it is an object of the present invention to provide a pipe expanding device which has an extremely high workability and which is capable of performing an appropriate pipe expansion instantaneously and surely and which has extremely high production efficiency.

[0010]

[Means for Solving the Problems]

 That is, the present invention is a reciprocating operation of reciprocating from one end side of a tube inserted through a large number of heat dissipating fins constituting a heat exchanger so as to press-fit a pipe expanding mandrel inserted opposite to the pipe. A pipe expansion structure having a body and retracting the pipe expanding mandrel facing the pipe that does not require pipe expansion in the direction opposite to the moving direction of the reciprocating body when the reciprocating body moves forward when the pipe expands. In the apparatus, the tube expanding apparatus main body is provided with a stripper that determines a protruding length of the tube protruding from the heat exchanger when the tube is expanded by the forward movement of the reciprocating actuator, and A stripper plate that moves back and forth along the reciprocating direction is provided, and a stripping mandrel that faces a pipe that does not need to be expanded and that advances together through the reciprocating body is provided in the stripper plate. Tubes wherein without contact unnecessary tube is retracted in a direction opposite to the movement direction of the reciprocating body, and predetermined mandrel holding device for holding is stopped at the position is a point which is integrally provided.

[0011]

[Action]

 In the tube expanding device 13 having the above-described structure, the tube expanding mandrel 6 that protrudes from the upper surface side of the reciprocating body 5 and moves in the direction opposite to the moving direction of the reciprocating body 5 is stopped at a predetermined position. Since the mandrel holding device 1 for holding is provided, the reciprocating operation is performed in a state in which the pipe expanding mandrel 6 facing the pipe 9 which does not require pipe expanding is escaped without abutting against the heat exchanger 11. The body 5 can be reciprocated.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

Regarding the configuration of the tube expanding device according to the embodiment of the present invention, the description of the parts overlapping with the tube expanding device of the conventional example will be omitted below.

In FIG. 1, 1 is suspended from a reciprocating body (not shown) provided in the tube expanding device main body 13a, and reciprocates along the reciprocating direction of the reciprocating body (not shown). It is integrally attached to the upper position of the moving stripper plate 7 through a pair of plate attachments (3c), and the expansion and contraction of a cylinder (not shown) provided on the upper portion of the tube expanding device main body 13a. 2 shows a mandrel holding device that moves together with a stripper plate 7 suspended by a reciprocating body (not shown) that moves up and down.

As shown in FIGS. 2 and 3, the mandrel holding device 1 includes a pipe expanding mandrel 6 which is locked and inserted into the reciprocating body, and a radial direction of the pipe expanding mandrel 6. A pair of gripping bodies 2a, 2b having a substantially arcuate cross section and facing each other so as to be gripped, and the pair of gripping bodies 2a, 2b are externally fitted to each other and the pair of gripping bodies 2a, 2b. A mandrel holder 2 composed of a leaf spring 2c having a substantially C-shaped cross section for urging the mandrel holders 2 to abut each other, and a mandrel plate 2a composed of two plate bodies 3a and 3b for holding the mandrel holder 2 therebetween. 3 and 3 are included.

The pipe expanding apparatus according to the present embodiment has the above-mentioned configuration. A case of expanding the heat exchanger set by using the following apparatus will be described.

First, as shown in FIG. 4, when the reciprocating body (not shown) descends through extension of a cylinder (not shown), the reciprocating body is suspended by the reciprocating body (not shown). The stripper plate 7 and the mandrel holding device 1 integrally attached to the stripper plate 7 are also lowered (arrow B) at the same time.

Next, since the stripper 7a that determines the protruding length of the pipe 9 protruding from the heat exchanger 11 is provided on the lower surface of the stripper plate 7 that descends (arrow B) as described above, By contacting the end plate 10a of the heat exchanger 11 by the stripper 7a, the end plate 10a is pushed down by a predetermined size (arrow C) to determine the projecting length of the pipe 9. At this time, since the mandrel holding device 1 holds the pipe expanding mandrel 6 and is integrally provided on the stripper plate 7 provided with the stripper 7a, the stripper 7a is the end plate of the heat exchanger 11. The lowering of the pipe expanding mandrel 6 is also stopped when it comes into contact with the pipe 10a.

Therefore, when the stripper 7a of the stripper plate 7 contacts the end plate 10a of the heat exchanger 11 as described above, the reciprocating body (not shown) is lowered as shown in FIG. Then, the plurality of tube expanding mandrels 6 locked to the reciprocating body (not shown) are press-fitted (arrows) into the tube 9 inserted into the heat exchanger 11 through the tube expanding pattern of the pressing attachment 5d. D), the pipe expanding mandrel 6 facing the pipe 9 that does not require pipe expansion held by the mandrel holding device 1 is reciprocated through the escape through hole 5e provided in the pressing attachment 5d. It projects (not shown) from the upper surface side of the actuation body (not shown).

Therefore, at the time of pipe expansion, the pipe expansion mandrel 6 facing the pipe 9 which does not require pipe expansion inserted into the heat exchanger 11 is escaped without abutting the pipe 9 which does not require pipe expansion. In this state, the reciprocating body 5 can be reciprocated to perform a desired pipe expanding operation.

In the above embodiment, the mandrel holding device is provided between the heat exchanger and the reciprocating body, and the pipe expanding mandrel inserted in the reciprocating body is the mandrel for expanding the pipe. A mandrel holder comprising at least a pair of gripping bodies facing each other for gripping in the axial direction and a leaf spring (elastic body) for urging the pair of gripping bodies to attract each other. It consists of a holder plate that is equipped with a mandrel holder and that moves with the reciprocating body, but the point is to hold and hold the pipe expanding mandrel that moves in the opposite direction of the reciprocating body at a predetermined position. As long as it is possible to do so, for example, it is possible to stop the movement of the pipe expanding mandrel and hold it by inserting an expanding and contracting convex body into the concave body formed in the pipe expanding mandrel. A typical mandrel holding mechanism is not limited.

Further, in the above embodiment, the mandrel holder includes at least a pair of gripping bodies facing each other for gripping the tube expanding mandrel in the axial direction of the tube expanding mandrel, and the pair of gripping bodies. It consists of leaf springs (elastic bodies) that urge each other to abut, but if it holds the expansion mandrel to hold it, the specific mechanism, shape, quantity, etc. of the holding body. However, the leaf spring for urging the pair of gripping bodies to abut may be a simple spring spring (not shown) or the like.

Further, in the above-mentioned embodiment, the pipe expanding mandrel, which is inserted into the heat exchanger and faces the pipe not requiring pipe expansion, protrudes from the upper surface of the reciprocating body when the reciprocating body descends. Although it is always held by the mandrel holding device, it may be a mechanism that is held and lowered via the mandrel holding device only when the reciprocating body descends.

Further, the tube expanding device in the above embodiment has a mandrel arrangement corresponding to a heat exchanger having tubes arranged in two rows in front and rear, but the present invention is not limited to this. Needless to say, the mandrel arrangement may be adjustable along various arrangement patterns of the tubes inserted into the expanded heat exchanger.

Further, in the above-mentioned embodiment, the mandrel holding device is integrally provided at the upper position of the stripper plate via a pair of plate attachments, but the mandrel holding device and the stripper plate are A flare punch plate (not shown) having a predetermined shape flare punch (not shown) used for secondary or tertiary expansion may be provided between the two so as to be reciprocally movable.

The specific shape, quantity, mechanism, etc. of the mandrel holder provided in the mandrel holding device and the holder plate equipped with the mandrel holder according to the present invention are not limited by any means. The point is that the pipe expanding mandrel that can move in the direction opposite to the direction of movement of the reciprocating body and that faces the pipe that does not require pipe expansion and is inserted into the heat exchanger does not come into contact with the pipe at a predetermined position. If a mandrel holding device for stopping and holding the mandrel is provided, all the specific configurations can be arbitrarily changed in design within the scope intended by the present invention.

[0027]

[Effect of device]

 As described above, according to the present invention, the reciprocating motion is performed from one end side of the tube inserted and inserted into the plurality of heat dissipating fins constituting the heat exchanger so as to press-fit the expanding mandrel which is inserted so as to face the tube. And a reciprocating body for expanding the tube. When the reciprocating body moves forward during pipe expanding, the pipe expanding mandrel facing the pipe that does not require pipe expansion is retracted in the direction opposite to the moving direction of the reciprocating body to escape. In the tube expanding apparatus, the tube expanding apparatus main body is provided with a stripper for determining the protruding length of the tube protruding from the heat exchanger when the tube is expanded by the forward movement of the reciprocating body. A stripping plate that reciprocates along the reciprocating direction of the reciprocating body, the stripper plate facing a pipe that does not need to be expanded and that moves forward through the reciprocating body. A mandrel holding device for retracting the reciprocating body in a direction opposite to the moving direction of the reciprocating body without contacting the pipe that does not require expansion and for holding the mandrel at a predetermined position. Therefore, it becomes possible to escape the pipe expanding mandrel facing the pipe that does not require pipe expansion inserted into the heat exchanger without contacting the heat exchanger, and perform the desired pipe expanding operation. Therefore, as in the conventional case, the tip of the unnecessary pipe expanding mandrel is brought into contact with at least one of the end plate and the pipe of the heat exchanger by the lowering of the forward / backward moving body, so that the pipe expanding mandrel or the heat exchanger is It is possible to provide a tube expanding device that has extremely high work efficiency and extremely high production efficiency as it can eliminate the work of exchanging members etc. due to damage and can perform appropriate tube expanding work. They came to have a special effect that that.

[Brief description of drawings]

FIG. 1 is a front view of a notched part of a tube expanding device according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the mandrel holding device in the tube expanding device of the present invention.

FIG. 3 is an enlarged perspective view showing a mandrel holder of the mandrel holding device in FIG.

FIG. 4 is a partially cutaway side view showing a state during pipe expansion in the pipe expansion device of the present invention.

FIG. 5 is a partially cutaway side view showing a state after pipe expanding in the pipe expanding device of the present invention.

FIG. 6 is a front view showing a conventional tube expanding device.

[Explanation of symbols]

 1 Mandrel holding device 2 Mandrel holder 3 Holder plate 5 Reciprocating body 6 Pipe expanding mandrel 7 Stripper plate 11 Heat exchanger 13a Tube expanding device body

Claims (2)

[Scope of utility model registration request] 1. A pipe expanded from one end of a pipe (9) inserted through a large number of radiating fins (8) constituting a heat exchanger (11) so as to face the pipe (9). A pipe expanding mandrel that has a reciprocating body (5) that reciprocates to press fit the mandrel (6), and that faces the pipe (9) that does not require pipe expansion when the reciprocating body (5) advances during pipe expansion. In a tube expanding device (13) having a structure in which (6) is retracted in a direction opposite to the moving direction of the reciprocating body (5) to escape, the tube expanding device body (13a) includes
When the pipe (9) is expanded by advancing the reciprocating body (5), a stripper (7a) for determining the protruding length of the pipe (9) protruding from the heat exchanger (11) is provided, and the reciprocating motion is also provided. A stripper plate (7) that reciprocates along the reciprocating direction of the actuating body (5) is provided, and the stripper plate (7) does not need to expand the pipe that moves forward through the reciprocating actuating body (5). Tube mandrel (6) facing the tube (9)
Mandrel holding device for retracting and holding the pipe (9), which does not require expansion, in the direction opposite to the moving direction of the reciprocating body (5), and stopping and holding the pipe at a predetermined position.
(1) is integrally provided, the tube expanding device. 2. A mandrel for holding the pipe expanding mandrel (6) inserted in the reciprocating body (5) in the axial direction of the pipe expanding mandrel (6) by the mandrel holding device (1). A holder (2), a holder plate (3) equipped with the mandrel holder (2), and a plate attaching tool (3c) for attaching the holder plate (3) to the stripper plate. (3) is a stripper plate via the plate fixture (3c)
The pipe expanding device according to claim 1, wherein the pipe expanding device is configured to be attached to a position above (7).