JP2552924Y2 - Pipe expansion device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe expanding apparatus, and more particularly, to a pipe expanding apparatus for press-fitting a pipe expansion mandrel into a plurality of pipes provided in a heat exchanger and expanding the pipes.

[0002]

2. Description of the Related Art Conventionally, as this type of tube expanding device, for example, as shown in FIGS. 4 and 5, a tube reciprocating via cylinders 4 and 4 and having a through hole 5b at the center thereof. A mandrel locking body in which a plurality of expansion mandrels 6 each having a locking head 6a are inserted into a lower surface 5a of a rectangular reciprocating body 5.
5c, and a pressing attachment 5d for pressing the locking head 6a of the expansion mandrel 6 at the time of expanding the pipe is detachably inserted between the mandrel locking body 5c and the reciprocating body 5. In order to apply flare processing as secondary and tertiary expansion to the stripper plate 8 provided with a stripper 8a for determining the projecting length of the pipe 10 at the time of expansion and the opening of the pipe 10 after expansion. There is a device in which a flare plate 7 having a plurality of flare punches 7a is suspended from the reciprocating member 5 so as to be interlocked therewith and is provided so as to be reciprocally movable.

[0003] That is, in the pipe expanding apparatus having the above-described configuration, a pipe 10 to be expanded whose lower end 10a is formed in a substantially U shape below a plurality of radiating fins 9 below the stripper plate 8 is provided.
Are inserted in a plurality of rows in the same direction, and a heat exchanger 12 formed with desired end plates 11a and 11b at both ends of the radiation fin 9 into which the pipe 10 is inserted is inserted through a receiver 13. The reciprocating member 5 is lowered through the cylinders 4 and 4 so that the mandrel 6 for expanding the pipe is pressed into the pipe 10 as shown in FIG. And the end plates 11a and 11b and the plurality of radiation fins 9 and the tube 10 are integrally fixed, and the flare punch 7a is expanded.
The desired flare processing 10b can be performed by press-fitting into the openings 10.

[0004]

However, the above-mentioned conventional pipe expanding apparatus has the following problems.

That is, the flare punch plate 7 and the stripper plate 8 suspended from the above-mentioned conventional pipe expanding device.
Are slidably suspended at predetermined intervals on a plurality of suspension rods 14 suspended from both sides of the reciprocating body 5.

Accordingly, the projecting length of the tube 10 protruding from the end plate 11a and the flare processing 10b on the protruding tube 10 can be performed to a predetermined depth size by the reciprocating member 5 being lowered. How about the end plate
The projecting length of the tube 10 projecting from the tube 11a and the depth dimension of the flaring process 10b on the projecting tube 10 are different depending on the type of the heat exchanger 12, and each time, the flare punch 7a and the stripper 8a having different lengths are exchanged. Must.

Therefore, depending on the type of the heat exchanger 12, the projecting length of the tube 10 projecting from the end plate 11a of the heat exchanger 12, and the flare punch 7a and the stripper 8a when the projecting tube 10 is subjected to flaring 10b. Not only is the replacement work very complicated, but also requires a plurality of flare punches 7a and strippers 8a having different lengths, which also increases the manufacturing cost.

The present invention solves all of the above-mentioned problems, and includes a case where the length of a tube protruding from an end plate is set according to the type of a heat exchanger, and a case where a predetermined depth dimension is provided to the protruding tube. When performing flaring, it is not only unnecessary to replace the flare punch and stripper at all, but also to instantly and accurately determine the projecting length of the tube projecting from the end plate and the flare processing dimension separately. It is an object of the present invention to provide an extremely excellent pipe expanding device that can be set.

[0009]

That is, the present invention provides a reciprocating body in which a plurality of mandrels for expansion are inserted so as to be press-fit into a plurality of pipes to be expanded which protrude from the heat exchanger.
A flare punch plate is provided with a plurality of flare punches for performing flare processing on the opening of the pipe expanded through the reciprocating body, and reciprocates along the reciprocating direction of the reciprocating body. A stripper for determining a projecting length of a tube protruding from the heat exchanger; a stripper plate reciprocating in a reciprocating direction of the reciprocating member; and the stripper plate, the flare punch plate, and the reciprocating member. Reciprocating means for reciprocating, the reciprocating member, the flare punch plate and the stripper plate are each provided by a reciprocating mechanism having a plurality of power means provided on the expanding device body. The point is that they reciprocate separately.

[0010]

In the tube expanding apparatus having the above-mentioned construction, each of the reciprocating member 5, the flare punch plate 7 and the stripper plate 8 is separately formed by a reciprocating mechanism having a plurality of power means provided in the tube expanding apparatus main body. The length of the tube projecting from the end plate and the depth dimension of the flaring process are set individually and instantly and accurately without any replacement work of the flare punch and stripper at the time of expanding the tube. You can do it.

[0011]

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

Regarding the configuration of the tube expansion device in one embodiment of the present invention, the description of the same portions as those of the conventional tube expansion device will be omitted below.

In FIG. 1, reference numeral 1 denotes a pipe expanding apparatus main body formed via a support 1b standing on a base (not shown).

2 is provided on a reciprocating member 5 provided on the pipe expanding device main body 1, and is arranged along a pair of guide posts 1a suspended from the base (not shown). 1 shows an electric motor as a power means for reciprocating a motor.

Reference numeral 3 denotes a rack (rail) provided along the column 1b.

The electric motor 2 and a rack (rail body)
A shaft 3 is attached to a shaft extending from a torque transmitting means such as a chain 2a for transmitting the torque of the electric motor 2 and a speed reducer (not shown) provided at a predetermined position. A reciprocating mechanism is constituted by meshing a pinion 3a (rotating body) having a tooth portion (meshing portion) with the rack 3.

Reference numeral 5f denotes a reciprocating member guide, which includes a guide roller 5g rotatably engaged with a guide rail 1c engraved on the column 1b. It is attached.

Reference numeral 7 denotes a flare punch plate which reciprocates in the reciprocating direction of the reciprocating member 5 and, like the reciprocating member 5, a rack 3 (rail member) provided along the column 1b. By engaging a pinion 3a (rotating body), the pair of guide posts are
1a is reciprocally movable.

Reference numeral 2b denotes a cylinder as a power means for reciprocating the flare punch plate 7, and is provided on the column 1b.

Reference numeral 7b denotes a flare punch plate guide, which has a guide roller 7c rotatably engaged with a guide rail 1c engraved on the support 1b, and a guide roller 7c on both sides of the flare punch plate 7. It is attached.

Below the flare punch plate 7, a pinion 3a (rotary member) is engaged with a rack 3 (rail member) provided along the column 1b, like the reciprocating member 5. Thus, a stripper plate 8 for reciprocating the pair of guide posts 1a in the same manner as the reciprocating body 5 is provided with the electric motor 2 for rotating the pinion 3a (rotating body).

The tube expansion apparatus according to the present embodiment has the above-described configuration. A case in which desired expansion is performed using the following apparatus will be described.

First, as shown in FIG.
When the electric motor 2 provided on the stripper plate 8 and the cylinder 2b provided on the flare punch plate 7 are operated, respectively, the reciprocating body 5, the stripper plate 8 and the flare punch plate 7 are each turned into a pinion 3a (rotating). Body) and the rack 3 or the cylinder 2b.

Therefore, as described above, the reciprocating member 5, the stripper plate 8 and the flare punch plate 7 are individually lowered, and as shown in FIG. The pipe expansion mandrel 6 is pressed into the pipe 10 to perform a desired pipe expansion operation, and at the same time, the projection length of the pipe 10 projecting from the end plate 11a of the heat exchanger 12 at the time of pipe expansion, and the depth of the flare processing 10b. The dimensions can be individually set so that the dimensions can be appropriately set to the desired dimensions.

In the above embodiment, an electric motor is used as the power means for reciprocating the reciprocating member and the stripper plate separately, and the power means for reciprocating the flare punch plate is used as the power means. Although a cylinder is used, a servo motor, an induction motor and a synchronous machine, as well as various control motors, etc. may be used as long as the motor is used, and the specific mechanism, shape, quantity, etc. of the motor are never limited. Not only that, the configuration of the cylinder may be any of hydraulic pressure, air, and the like.

Further, in the above embodiment, an electric motor is used for the power means of the reciprocating member and the stripper plate, and a cylinder is used as the power means for the flare punch plate, as shown in FIG. Alternatively, the stripper plate may be suspended from one of the reciprocating member and the flare punch plate and reciprocated together. Alternatively, as shown in FIG.
And the flare punch plate may be driven by the electric motor 2. In short, each of the reciprocating member, the flare punch plate and the stripper plate has a plurality of power means provided on the pipe expanding device main body. If the reciprocating mechanism is independently reciprocated by a mechanism, the reciprocating member, the flare punch plate, and the stripper plate do not necessarily need to be provided with power means, and the power means may include the reciprocating member, flare punch plate. Needless to say, the power means such as the electric motor or the cylinder may be separately provided from the reciprocating member, the flare punch plate and the stripper plate, and may be provided separately from the stripper plate. May be provided.

Further, in the above-mentioned embodiment, each of the reciprocating member and the flare punch plate each having a motor as a power means is provided with a rotating force transmitting means such as a chain for transmitting the rotating force of the motor and a predetermined force. A pinion (rotating body) provided with a predetermined number of teeth (meshing portions) to be rotated via a reduction gear (not shown) provided at a position, and the teeth of the pinions can mesh with each other, and the pipe is expanded. Although it is configured to reciprocate separately with a rack (rail body) provided on a support of the device, it is necessary to have a rotating force transmitting means such as a chain and a speed reduction device provided at a predetermined location. However, the specific shape of the rack (rail body) may be a pin rack, a double rack, a mangle rack, or the like.
Further, the rack (rail body) does not need to be provided on the column of the pipe expansion device main body, and the pinion (rotary body) meshing with the rack (rail body) may be a pin gear, a worm gear, or the like. Well, in short, a reciprocating mechanism is constituted by a rail provided on the pipe expanding device main body, a rotating body having a meshing portion meshable with the rail, and an electric motor for rotating the rotating body, and As long as the reciprocating member and the flare punch plate reciprocate separately along the rail, the specific mechanism, shape, quantity, and the like of each part are not limited.

The tube expansion device in one embodiment of the present invention is a vertical tube expansion device erected on a base.
As long as the flare punch plate and the stripper plate reciprocate independently of each other, it is needless to say that a so-called horizontal tube expansion device that moves substantially parallel to the ground, the floor, or the like may be used.

Further, in the above embodiment, the reciprocating mechanism provided in the pipe expanding device main body includes a rail provided in the pipe expanding device main body, and a rotating body having a meshing portion meshable with the rail. A plurality of power means for rotating the rotating body, but necessarily includes a rail provided on the pipe expanding device main body, a rotating body having a meshing portion meshable with the rail, and rotating the rotating body. There is no need to form a reciprocating mechanism with a plurality of power means for causing the reciprocating mechanism, the flare punch plate and the stripper plate to reciprocate separately by the plurality of power means. If it is sufficient, a rail provided on the pipe expansion device main body,
Needless to say, a reciprocating mechanism by a rotating body having a meshing portion meshable with the rail body is not always an essential requirement.

Further, in another embodiment, each of the reciprocating member and the flare punch plate or the stripper plate which reciprocate separately is configured to reciprocate along a common rail. The rails provided in the above may be configured to reciprocate separately, and the rails do not need to be common, and the rails may be integrally formed by a plurality of connecting bodies.

The specific structure of the power means and the reciprocating mechanism, such as the mechanism, type, quantity, shape, and mounting location of the reciprocating mechanism can be freely changed within the intended range of the present invention. It is.

[0032]

As described above, according to the present invention, a reciprocating member in which a plurality of mandrels for expansion are inserted so as to be able to be press-fitted into a plurality of pipes to be expanded which protrudes from the heat exchanger. A flare punch plate provided with a plurality of flare punches for performing flare processing on the opening of the pipe expanded via the reciprocating member, and a flare punch plate reciprocating along the reciprocating direction of the reciprocating member; A stripper for determining a projecting length of a pipe protruding from the exchanger; a stripper plate reciprocating in a reciprocating direction of the reciprocating member; and a reciprocating member for reciprocating the stripper plate, the flare punch plate and the reciprocating member. Reciprocating means for moving the tube, the reciprocating member, the flare punch plate and the stripper plate are each provided on the tube expanding device main body. Since each reciprocating mechanism is independently reciprocated by a reciprocating mechanism having a plurality of power means, it is necessary to set the projecting length of the tube projecting from the end plate depending on the type of the heat exchanger, or to provide a flare having a predetermined depth to the projecting tube. In the case of processing, not only is the replacement of the flare punch and stripper completely unnecessary, but also instantaneously and accurately set the protrusion length of the tube protruding from the end plate and the flare processing length separately. I can do it.

Further, unlike the conventional pipe expanding apparatus, a plurality of flare punches and strippers having different lengths are not required at all, so that the production cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tube expanding device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a tube expanding device according to another embodiment of the present invention.

FIG. 3 is a perspective view showing a tube expanding device according to another embodiment of the present invention.

FIG. 4 is a front view showing a conventional pipe expanding device.

FIG. 5 is an enlarged sectional view showing a state near a mandrel before pipe expansion.

FIG. 6 is an enlarged sectional view showing a state near a mandrel after pipe expansion. DESCRIPTION OF SYMBOLS 1 ... Tube expansion apparatus main body 2 ... Electric motor 3 ... Rack (rail body) 3a ... Pinion (rotary body) 5 ... Reciprocating body 6 ... Tube expansion mandrel 7 ... Flare punch plate 7a ... Flare punch 8 ... Stripper plate 8a ... Stripper

Claims (1)

(57) [Scope of request for utility model registration] A reciprocating member (5) inserted into a plurality of mandrels (6) for expanding a tube so as to be press-fit into a plurality of tubes (10) to be expanded protruding from a heat exchanger (12). A plurality of flare punches 7a for performing flare processing 10b at the opening of the pipe 10 expanded through the pipe 10; and a flare punch plate 7 that reciprocates along the reciprocating direction of the reciprocating body 5; A stripper 8a for determining a projecting length of the tube 10 projecting from the heat exchanger 12; a stripper plate 8 reciprocating along the reciprocating direction of the reciprocating member 5; the stripper plate 8; And a reciprocating means for reciprocating the reciprocating member 5, the reciprocating member 5, the flare punch plate 7, and the stripper plate 8 are each expanded. A tube expansion apparatus characterized in that it is configured to reciprocate separately by a reciprocating mechanism having a plurality of power means provided in the apparatus main body 1.