JPH0588729U - Horizontal tube expansion device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] The present invention is a pipe which does not need to be expanded even when a reciprocating body having a mandrel is retracted to the initial position after the pipe is expanded and which projects rearward from the back surface of the reciprocating body. By preventing the head of the pipe expanding mandrel facing to the inside from entering into the pattern plate mounted on the reciprocating body, the workability and the production efficiency that the pattern plate can be easily attached and detached. And an extremely high tube expansion device. A reciprocating body is provided with a through hole on the back surface for projecting a mandrel opposed to a pipe that does not require expansion, and a mandrel protruding from the through hole is held on the back side of the reciprocating body. The mandrel holder is provided so as to be movable in the penetrating direction of the pipe.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to expansion of a heat exchanger, and more particularly to a horizontal expansion device used for fixing a large number of heat radiation fins and a plurality of pipes by expansion.

[0002]

[Prior Art]

 Conventionally, as a horizontal expansion device of this type, for example, as shown in FIG. 5, a plurality of through holes 3a are formed in a reciprocating body 3 which reciprocates by a cylinder (not shown) or the like. A pipe expanding mandrel 4 having a head 4a provided with a locking step 5 having a diameter larger than that of the mandrel shaft 4b is slidable so as to project toward the rear surface 3b of the reciprocating body 3a. The mandrel 4 is inserted so as to prevent the mandrel 4 from being pulled out toward the tip 4c side by the engagement of the locking stepped portion 4c and the reciprocating body 3, and only at a predetermined position of the reciprocating body 3. Is a pattern plate mounting space for detachably mounting the pattern plate 6 formed in a predetermined pipe expanding pattern so as to press the head 4a of the mandrel 4 facing the position of the mandrel 4 used for pipe expanding. Part 7 was provided Becomes used there to be appropriately.

On the tip 4c side of the mandrel 4, 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. The heat exchanger 10 is set.

[Problems to be solved by the device]

 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 device has a pattern plate formed with a predetermined tube expanding pattern in a pattern plate mounting space formed at a predetermined position of the reciprocating body. Then, the mandrel can be pressed into each of the tubes by the forward movement of the reciprocating body and the head of the tube expanding mandrel is pressed through the pattern plate to perform predetermined tube expansion. As for the mandrel facing the unnecessary tube, the mandrel is allowed to escape from the tube that does not require expansion 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 that 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 retreats to the initial position after completion of pipe expansion, the mandrel also retracts a predetermined distance together with the reciprocating body due to the 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 the pattern plate. Therefore, at the time of attaching and detaching the pattern plate, the head of the mandrel cannot be detached unless the head of the mandrel is ejected from the pattern plate. There were various serious problems in that the operation time was significantly hindered and the productivity and work efficiency decreased.

Therefore, 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 rearward 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. Therefore, it is an object of the present invention to provide a pipe expanding device that has extremely excellent workability and extremely high production efficiency.

[0008]

[Means for Solving the Problems]

 That is, the present invention reciprocates in the penetrating direction of the pipes 9 so as to press fit the mandrel 4 for expanding the pipes from one end side 9a of the plurality of pipes 9 penetrating the plurality of heat radiation fins 8 constituting the heat exchanger 10. When the reciprocating actuating body 3 has the actuating body 3, and the reciprocating actuating body 3 is advanced to press the mandrel 4 for expanding the pipe into the pipe 9, the reciprocating actuating body 3 does not need to be expanded. In a horizontal tube expanding device provided with a through hole 3a for projecting a mandrel 4 opposed to 9, a mandrel 4 projecting from the through hole 3a is held on the back surface 3b side of the reciprocating body 3. The mandrel cradle 2 is provided so as to be movable in the penetrating direction of the pipe 9.

[0009]

[Action]

 In the horizontal tube expanding device 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 expanding, and the reciprocating body 3 is provided with the through hole 3a. Since the mandrel holder 2 for holding the mandrel 4 protruding from the through hole 3a is provided on the back surface 3b side so as to be movable in the penetrating direction of the pipe 9, the reciprocating body 3 after the pipe expansion is initially formed. When the mandrel 4 is retracted to the position, the mandrel 4 can be prevented from retracting due to frictional resistance with the reciprocating body 3 by holding the mandrel cradle 2.

[0010]

【Example】

 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 pedestal provided on the back surface 3 b side of the reciprocating body 3 included in the horizontal tube expanding apparatus 1, and the reciprocating operation is performed via a pattern plate 6 attached to the reciprocating body 3. The reciprocating body 3 is provided with an insertion hole 2a for holding a locking step portion 5 provided in a head portion 4a of a mandrel 4 facing a tube which does not need to be expanded and which projects from the back surface 3b side of the body 3. Is provided at the upper part of the horizontal tube expanding device 1 so as to reciprocate along the movement of the.

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

The horizontal tube expanding apparatus according to the present embodiment has the above-described configuration. A case will be described where the tube of the heat exchanger is expanded using the apparatus described below.

First, as shown in FIG. 2, when the reciprocating body 3 is advanced (arrow A) through a cylinder (not shown) or the like, the pattern plate 6 attached to the reciprocating body 3 is moved. The mandrel 4 corresponding to the pipe expanding pattern performs predetermined pipe expanding, and the mandrel 4 facing the pipe that does not require pipe expanding protrudes from the back surface 3b side of the reciprocating body 3.

When the mandrel 4 facing the tube that does not require expansion is projected from the rear surface 3b side of the reciprocating body 3, the mandrel cradle 2 is fixed by a cylinder (not shown) or the like. When the mandrel 4 is moved forward (arrow B), the head 4a of the mandrel 4 is inserted into the mandrel holding insertion hole 2a provided in the mandrel cradle 2, and the mandrel 4 is inserted into the head 4a. The formed locking step portion 5 is held in the insertion hole 2a.

Further, as shown in FIG. 3, when the reciprocating body 3 is retracted to the initial position (arrow C) after the end of the pipe expansion, the mandrel cradle 2 projects the head 4 of the mandrel 4 protruding. By reciprocating the locking step 5 formed in a by a predetermined distance (arrow D) while holding it by the mandrel holding insertion hole 2a provided in the mandrel holder 2, It is possible to prevent the mandrel 4 which moves backward together with the reciprocating actuator 3 by a predetermined distance due to the frictional resistance with the reciprocating actuator 3 due to its own weight when the actuator 3 retracts.

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. By moving forward by the distance (arrow D) and then moving backward (arrow E) together with the reciprocating body 3, the reciprocating body 3 and the reciprocating body 3 are returned to the initial position.

Therefore, the mandrel 44a provided on the reciprocating body 3 which returns to the initial position as described above is prevented from moving backward through the frictional resistance due to its own weight due to the forward movement of the mandrel cradle 2. Therefore, 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 into the pattern plate 6 mounted on the reciprocating body 3.

Therefore, the mandrel 4 provided on the reciprocating body 3 does not enter the locking step 5 of the head 4 a 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 detaching the pattern plate 6. I can.

In the above embodiment, the reciprocating body having the mandrel for expanding the pipe has a through hole formed with a mandrel facing the pipe which does not need to be expanded by mounting the pattern plate having the expanding pattern. It is configured to protrude from the back side of the reciprocating body via the through hole. The point is that the mandrel facing the tube that does not require expansion is projected from the through hole provided on the back side of the reciprocating body to escape. As long as it is configured, the mounting of a pattern plate having a pipe expansion pattern is 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 line or a staggered type. Various patterns may be used.

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.

Therefore, the number and driving means of the mandrel, reciprocating body, mandrel cradle, etc., and the specific shape and mechanism of the horizontal tube expanding device in the present invention are not limited by any means. When a pipe is expanded, the mandrel facing the pipe that does not need to be expanded is projected from the through hole provided on the back side of the reciprocating body, and the mandrel cradle that holds the head of the protruding mandrel is As long as it is provided so as to be movable in the penetrating direction, all its specific configurations can be arbitrarily modified within the scope intended by the present invention.

[0025]

[Effect of the device]

 As described above, the present invention reciprocates by reciprocating in the penetrating direction of the tubes so as to press fit the mandrel for expanding the tube from one end side of the plurality of tubes penetrating the many radiating fins constituting the heat exchanger. A reciprocating body, the mandrel projecting from the reciprocating body does not need to be expanded when the mandrel for expanding the pipe is pushed forward into the pipe. In a horizontal pipe expanding device provided with a through hole for allowing the mandrel to rest on the back side of the reciprocating body, a mandrel holder for holding a mandrel protruding from the through hole is movable in the penetrating direction of the pipe. Therefore, even when the reciprocating motion body retreats to the initial position after pipe expansion, the head of the pipe expanding mandrel facing the pipe that does not need pipe expansion protruding rearward from the rear surface of the reciprocating body. Part is attached to the reciprocating body. By preventing the pattern plate from entering into the plate, not only can the complicated removal work of the pattern plate be performed easily, but also the time loss such as the work time can be eliminated and the workability is excellent and the production is good. The special effect of being able to provide a highly efficient pipe expanding device has been achieved.

[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 apparatus 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 in which the reciprocating body is retracted in the conventional horizontal tube expanding device.

[Explanation of symbols]

 1 Horizontal Tube Expansion Device 2 Mandrel Cradle 2a Insertion Hole for Holding Mandrel for Tube Expansion 3 Reciprocating Body 4 Tube Expansion Mandrel 5 Locking Step 6 Pattern Plate 10 Heat Exchanger

Claims (2)

[Scope of utility model registration request] 1. A reciprocating reciprocating motion in the penetrating direction of the pipe 9 for press-fitting a pipe expanding mandrel 4 from one end side 9a of a plurality of pipes 9 penetrating through a large number of heat radiating fins 8 constituting a heat exchanger 10. A back surface 3b of the reciprocating operation body 3 having the operation 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
The horizontal tube expanding device is 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 the 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 apparatus according to claim 1, wherein the horizontal tube expanding apparatus is configured to reciprocate so as to retract with the body 3.