JP2521407Y2 - Horizontal tube expansion device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger tube expansion, and more particularly to a horizontal tube expansion device used for fixing a large number of heat radiation fins and a plurality of tubes by tube expansion.

[0002]

2. Description of the Related Art Conventionally, as a horizontal pipe expanding device of this type,
For example, as shown in FIG. 5, a plurality of through holes 3a are formed in a reciprocating body 3 that reciprocates by a cylinder (not shown) or the like, and the through holes 3a have a head 4a, a mandrel shaft portion, and the like. 4b, a pipe expanding mandrel 4 provided with a locking step 5 having a diameter larger than that of 4b is slidable so as to project to the back surface 3b side of the reciprocating body 3 and reciprocating with the locking step 4c. By engaging with the body 3, the mandrel 4 is inserted so as to prevent the mandrel 4 from being pulled out toward the tip 4c side, and at a predetermined position of the reciprocating body 3, the position of the mandrel 4 used for pipe expansion is opposed. There is a pattern plate mounting cavity 7 for detachably mounting the pattern plate 6 formed in a predetermined expansion pattern to press the head 4a of the mandrel 4 and is used appropriately. It becomes.

On the side of the tip 4c of the mandrel 4,
A heat exchanger 10 is set in which one end 9a side of a plurality of tubes 9 penetrating a large number of heat radiation fins 8 in a predetermined arrangement pattern is positioned so as to face each of the mandrels 4.

However, the horizontal tube expanding apparatus 1 having the above-mentioned conventional structure has the following problems.

That is, as shown in FIG. 6, the above-mentioned conventional horizontal tube expanding apparatus has a pattern plate formed in a predetermined tube expanding pattern in a pattern plate mounting space formed at a predetermined location of a reciprocating body. After mounting, the mandrel can be pressed into each of the tubes by pressing the head of the tube expanding mandrel through the pattern plate by advancing the reciprocating body to perform predetermined tube expansion, and no tube expansion is required. With respect to the mandrel opposed to the pipe, the mandrel is made to escape from the pipe that does not need to be expanded by projecting the mandrel from a through hole provided in the back surface of the reciprocating body.

Therefore, as described above, the mandrel facing the tube which does not require tube expansion protrudes from the back surface of the reciprocating body, so that tube expansion is always performed according to the tube expansion pattern of the mounted pattern plate. When the reciprocating body is retracted to return to the initial position after completion of pipe expansion, the mandrel also retracts a predetermined distance together with the reciprocating body due to frictional resistance generated between the mandrel and the reciprocating body.

Therefore, as shown in FIG. 7, a part of the head of the mandrel provided with the reciprocating body and a step for locking the mandrel retracted by a predetermined distance enters into the pattern plate. Therefore, at the time of attaching / detaching the pattern plate, it is impossible to attach / detach the pattern plate unless the head of the mandrel is removed from the pattern plate. There have been various serious problems in that the operating time is significantly hindered and the productivity and work efficiency are lowered.

Thus, the present invention solves all of the above problems, and even when the reciprocating body after expanding the pipe retracts to the initial position, the reciprocating body moves backward from the back surface of the reciprocating body. By preventing the head of the pipe expanding mandrel facing the protruding pipe that does not require pipe expansion from entering into the pattern plate mounted on the reciprocating body, the pattern plate can be easily attached and detached. Very easy to work with,
Moreover, it is an object of the present invention to provide a tube expanding device having extremely high production efficiency.

[0008]

That is, according to the present invention, in order to press-in a pipe expanding mandrel 4 from one end side 9a of a plurality of pipes 9 penetrating a large number of heat radiating fins 8 constituting a heat exchanger 10. 9 has a reciprocating body 3 which reciprocates in the penetrating direction, and the reciprocating body 3 has a rear surface 3b for press-fitting the pipe expanding mandrel 4 into the tube 9. In a horizontal tube expanding device provided with a through hole 3a for projecting the mandrel 4 facing the tube 9 that does not require tube expansion when moving forward, in the rear face 3b side of the reciprocating body 3, the through hole 3a The mandrel holder 2 for holding the protruding mandrel 4 is provided so as to be movable in the penetrating direction of the pipe 9.

[0009]

In the horizontal tube expanding apparatus having the above structure, the back surface 3b of the reciprocating body 3 is provided with the through hole 3a for projecting the mandrel 4 facing the tube 9 which does not require tube expansion.
Moreover, the through hole 3a is formed on the back surface 3b side of the reciprocating body 3.
Mandrel cradle 2 for holding the more protruding mandrel 4
Is provided so as to be movable in the penetrating direction of the pipe 9, so that when the reciprocating body 3 is expanded to the initial position, the mandrel 4 is retracted by frictional resistance with the reciprocating body 3. It can be prevented by holding the mandrel cradle 2.

[0010]

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

In FIG. 1, reference numeral 1 denotes a horizontal tube expanding device.

Reference numeral 2 denotes a mandrel cradle provided on the back surface 3b side of the reciprocating body 3 provided in the horizontal tube expanding apparatus 1, and the reciprocating operation is performed via a pattern plate 6 mounted on the reciprocating body 3. The body 3 has an insertion hole 2a for holding a locking step portion 5 provided on a head portion 4a of a mandrel 4 which faces a tube which does not need to be expanded and which projects from the back surface 3b side. It is provided above the horizontal tube expanding device 1 so as to reciprocate along the movement.

Since the reciprocating body 3, the pattern plate 6, the mandrel 4, and the like have the same mechanism and structure as the horizontal tube expanding apparatus in the prior art, detailed description thereof will be omitted.

The horizontal tube expanding apparatus according to this embodiment has the above-mentioned structure. A case of expanding the heat exchanger by using the apparatus described below will be described.

First, as shown in FIG. 2, the reciprocating body 3 is advanced (arrow A) through a cylinder (not shown) or the like.
Then, the mandrel 4 corresponding to the pipe expanding pattern of the pattern plate 6 mounted on the reciprocating body 3 performs predetermined pipe expanding, and the mandrel 4 facing the pipe not requiring pipe expanding is the back surface 3b of the reciprocating body 3. It will protrude from the side.

Incidentally, when the mandrel 4 facing the pipe which does not require expansion is projected from the back surface 3b side of the reciprocating body 3, the mandrel cradle 2 is advanced a predetermined distance through a cylinder (not shown) or the like. By inserting (arrow B), the insertion hole 2 for holding the mandrel provided in the mandrel cradle 2 is formed.
The head portion 4a of the mandrel 4 is inserted into a, and the locking step portion 5 formed on the head portion 4a is inserted into the insertion hole 2a.
You will be detained at a.

Further, as shown in FIG. 3, when the reciprocating body 3 is retracted (arrow C) to the initial position after the pipe expansion,
The mandrel holder 2 has a predetermined stepped portion 5 formed on the head 4a of the projecting mandrel 4 while being held in the mandrel holding insertion hole 2a provided in the mandrel holder 2. By advancing the reciprocating body 3 by a predetermined distance (arrow D), the movement of the mandrel 4 retracted together with the reciprocating body 3 by a predetermined distance is prevented by frictional resistance with the reciprocating body 3 due to its own weight when the reciprocating body 3 retreats. Can be done.

As shown in FIG. 4, the mandrel holder 2 has a predetermined stepped portion 5 of the mandrel 4 projecting from the reciprocating body 3 while being held in the mandrel holding insertion hole 2a. Move forward a distance (arrow D), and then move the reciprocating body 3
By retracting (arrow E) together with the reciprocating body 3, the reciprocating body 3 is returned to the initial position.

Therefore, the mandrel 44a provided on the reciprocating body 3 returning to the initial position as described above is prevented from moving backward due to the frictional resistance due to its own weight due to the forward movement of the mandrel cradle 2. The pattern plate 6 mounted on the reciprocating body 3 is locked in the through hole 3a of the reciprocating body 3 without inserting the locking step portion 5 of the head 4a.

Therefore, the mandrel 4 provided on the reciprocating body 3 does not enter the locking step 5 of the head 4a into the pattern plate 6 mounted on the reciprocating body 3, and the reciprocating body 3 does not move. Since the pattern plate 6 is locked in the through hole 3a, it is possible to easily attach and detach the pattern plate 6 without detaching the head 4a of the mandrel 4 from the pattern plate when attaching and detaching the pattern plate 6.

In the above embodiment, the reciprocating body having the pipe expanding mandrel has the mandrel facing the pipe which does not need to be expanded through the through hole formed by mounting the pattern plate having the pipe expanding pattern. Although it is configured to project from the back side of the reciprocating body, the point is that the mandrel facing the tube that does not need to be expanded is escaped by protruding from the through hole provided on the back side of the reciprocating body. The mounting of a pattern plate or the like having a pattern is also not limited.

Needless to say, the arrangement pattern of the pipe expanding mandrels provided on the reciprocating body is not limited to the upper and lower stages, and the arrangement pattern of the mandrels is not limited to a straight line, but may be a non-linear form or a staggered type. May be various patterns.

Further, in the above-described embodiment, the head of the mandrel or the stepped portion provided on the head of the mandrel facing the tube which does not need to be expanded and which projects from the back side of the reciprocating body is held. The mandrel holding insertion hole provided in the mandrel cradle does not necessarily have to be a hole as long as it holds the head of the mandrel or the locking step provided on the head.

The number and driving means of the mandrel, reciprocating body and mandrel cradle in the present invention, and the specific shape and mechanism of the horizontal tube expanding device are not limited by any means. At the time of pipe expansion, a mandrel facing the pipe that does not require pipe expansion is projected from a through hole provided on the back side of the reciprocating body, and a mandrel cradle that holds the head of the protruding mandrel is arranged in the pipe penetration direction. If it is provided so as to be freely movable, its specific configuration can be arbitrarily changed in design within the scope intended by the present invention.

[0025]

As described above, the present invention reciprocates in the penetrating direction of the pipes so that the mandrel for expanding the pipe is press-fitted from one end side of the plurality of pipes penetrating the plurality of radiating fins constituting the heat exchanger. A reciprocating body that moves, and a rear surface of the reciprocating body faces a pipe that does not need to be expanded when the mandrel for expanding the pipe provided in the reciprocating body is advanced to press into the pipe. In a horizontal tube expanding device having a through hole for projecting a mandrel, a mandrel cradle for holding the mandrel projecting from the through hole is moved in the penetrating direction of the tube on the back side of the reciprocating body. Since the reciprocating body is freely installed, even when the reciprocating body retreats to the initial position after the tube expanding, the mandrel for pipe expanding facing the tube that does not need to be expanded and protrudes rearward from the rear surface of the reciprocating body. Attached to the reciprocating body By preventing the pattern plate from entering the inside, it is possible not only to easily perform the complicated attachment / detachment work of the pattern plate, but also to eliminate the time loss such as the working time and the workability is very excellent. Moreover, it has a special effect that it is possible to provide a pipe expanding device having extremely high production efficiency.

[Brief description of drawings]

FIG. 1 is a front view showing a horizontal tube expanding device according to the present invention.

FIG. 2 is a front view showing a state during pipe expansion in the horizontal pipe expanding device of the present invention.

FIG. 3 is a front view showing a state in which the reciprocating body and the mandrel cradle in the horizontal tube expanding apparatus of the present invention are retracted after tube expansion.

FIG. 4 is a front view showing a state in which the reciprocating body and the mandrel cradle are retracted in the horizontal tube expanding device of the present invention.

FIG. 5 is a front view showing a conventional horizontal tube expanding device.

FIG. 6 is a front view showing a state during pipe expansion in a conventional horizontal pipe expansion device.

FIG. 7 is a front view showing a state after reciprocation of a reciprocating body in a conventional horizontal tube expanding device.

[Explanation of reference numerals] 1 horizontal pipe expanding device 2 mandrel cradle 2a insertion hole for holding mandrel for pipe expanding 3 reciprocating body 4 pipe expanding mandrel 5 locking step 6 pattern plate 10 heat exchanger

Claims (2)

(57) [Scope of utility model registration request] 1. A reciprocating reciprocating movement in the penetrating direction of the pipe 9 for press-fitting a mandrel 4 for pipe expansion from one end side 9a of a plurality of pipes 9 penetrating a large number of heat radiation fins 8 constituting a heat exchanger 10. A back surface 3b of the reciprocating body 3 having an operating body 3
When the reciprocating body 3 advances so as to press-fit the mandrel 4 for expanding the pipe, the through hole 3 for projecting the mandrel 4 facing the pipe 9 which does not require expanding.
In the horizontal tube expanding device provided with a, the reciprocating body 3
A horizontal tube expanding apparatus, characterized in that a mandrel cradle 2 for holding a mandrel 4 projecting from the through hole 3a is provided on the back surface 3b side of the same so as to be movable in the penetrating direction of the tube 9. 2. The mandrel cradle 2 holds a mandrel 4 projecting from the through hole 3a when the reciprocating body 3 is retracted and advances a predetermined distance, and the reciprocating operation is performed after the mandrel 4 advances a predetermined distance. The horizontal tube expanding device according to claim 1, wherein the horizontal tube expanding device is configured to reciprocate so as to retract with the body 3.