JP2549199Y2 - 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 apparatus, for example, as shown in FIGS. 3 and 4, a tube reciprocating through 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 a flaring process, which is a secondary or tertiary expansion, to the stripper base 8 provided with a stripper 8a for determining the projection 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 punch table 7 having a plurality of flare punches 7a is suspended from the reciprocating member 5 so as to be interlocked with each other and is reciprocally movable.

That is, the main body 1 of the expansion apparatus having the above-described structure.
Is a pipe to be expanded whose lower end 10a is formed in a substantially U-shape on a plurality of radiation fins 9 below the stripper base 8.
A plurality of rows 10 are inserted in the same direction, and desired ends plates 11a and 11b are provided at both ends of the radiation fin 9 through which the pipe 10 is inserted.
The heat exchanger 12 formed with the above is mounted via a receiver 13 and the reciprocating body 5 is lowered via the cylinders 4 and 4, as shown in FIG. The pipe expansion mandrel 6 is pressed into the pipe 10 to expand the pipe 10, and the end plates 11a, 11b and the plurality of radiation fins 9 and the pipe 10 are integrally fixed. At the same time, the desired flare processing 10b can be performed by press-fitting the flare punch 7a into the opening of the pipe 10 after expansion.

[0004]

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

That is, the flare punch table 7 and the stripper table 8 suspended from the above-mentioned conventional pipe expanding apparatus are provided at predetermined intervals on a plurality of suspension rods 14 suspended from both sides of the reciprocating member 5. Each is slidably suspended.

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 differ depending on the type of the heat exchanger 12, and must be replaced with a flare punch 7a and a stripper 8a having different lengths each time. No.

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 because a plurality of flare punches 7a and strippers 8a having different lengths are required, the production cost is increased.

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, not only is it unnecessary to replace the flare punch and stripper, but also the instantaneously and accurately the projection length of the tube protruding from the end plate and the depth dimension of the flaring, etc. It is an object of the present invention to provide an extremely excellent tube expanding device that can be set separately.

[0009]

That is, the present invention comprises a stripper for determining the length of a tube projecting from the heat exchanger when expanding the tube inserted through the heat exchanger. A stripper base provided reciprocally movable facing the vessel, and a flare punch base having a flare punch for performing a predetermined flaring process on an opening of the pipe after the expansion. A flare punch table is provided integrally with the stripper table, and reciprocates with the heat exchanger by predetermined guide means and power means.

[0010]

In the expansion apparatus having the above-mentioned construction, the flare punch table 7 for performing the desired flare processing 10b on the pipe 10 of the heat exchanger 12 after the expansion is reciprocated facing the heat exchanger 12. The flare punch 7a, the stripper 8a, etc. are exchanged at the time of expanding the tube because they are integrally provided on the freely provided stripper table 8 and reciprocate by facing the heat exchanger 12 by predetermined guide means and power means. Without performing any operation, the projecting length of the tube 10 projecting from the end plate 11a of the heat exchanger 12 and the depth dimension of the flare processing 10b are instantaneously and accurately determined for each of the stripper table 8 and the flare punch table 7. Each can be set separately by moving.

[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 1a denotes a column of a pipe expansion device main body 1 (not shown) which is erected on a base (not shown).

Reference numeral 2 denotes a cylinder 2b for reciprocating the flare punch table 7 having a predetermined flare punch 7a along the column 1a, and is formed in a substantially rectangular parallelepiped shape to accommodate the flare punch table 7 therein. Provided on the stripper base 8 and the stripper base 8 is mounted on the support 1a.
The figure shows an electric motor as a power means for reciprocating along.

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

The stripper base 8 has a rotating force transmitting means such as a chain 2a for transmitting the rotating force of the electric motor 2 and a shaft extending from a speed reducer (not shown) provided at a predetermined location. A pinion 3a (rotating body) is provided on the shaft 3 and provided with a predetermined number of teeth (meshing portions). The pinion 3a (rotating body) is meshed with the rack 3.

Reference numeral 8b denotes a stripper base guide, which includes guide rollers 8c which are rotatably engaged with guide rails 1b engraved on the columns 1a, and two guide rollers 8c on both sides of the stripper base 8. It must be installed one by one.

The flare punch table 7 accommodated in the stripper table 8 has a rack 3b provided in the stripper table 8 in the same direction as the rack (rail) 3 provided on the column 1a. Pinion 3c meshing with rail
(Rotating body) to constitute a guide means for the flare punch table 7 and the stripper table 8
It is configured to reciprocate inside.

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

First, as shown in FIG. 2, the stripper table 8 is connected via the electric motor 2, the pinion 3a and the rack 3.
Is moved forward by a predetermined distance (arrow A), so that the projecting length of the tube 10 projecting from the end plate 11a of the heat exchanger 12 via the stripper 8a provided on the stripper base 8 is set to a desired size. I can do it.

Next, the reciprocating member (not shown) provided with the expanding mandrel 6 is lowered onto the tube 10 projecting to a desired size from the end plate 11a of the heat exchanger 12 as described above. A predetermined pipe expansion operation can be performed by press-fitting the pipe expansion mandrel 6 into the pipe 10.

Further, after a predetermined primary expansion is completed by press-fitting the expansion mandrel 6, the flare punch table 7 stored in the stripper table 8 is advanced through the extension of the rod 2c of the cylinder 2b (arrow B). By doing so, a predetermined flaring process 10b can be applied to the opening of the tube 10 after the primary expansion by the flare punch 7a provided on the flare punch table 7.

Accordingly, as described above, the stripper table 8 and the flare punch table 7 advance separately, so that the projecting length of the pipe 10 projecting from the end plate 11a of the heat exchanger 12 at the time of expansion and the pipe after expansion are expanded. The depth dimension of the flare processing 10b applied to the openings 10 can be separately extended and set without replacing the stripper 8a and the flare punch 7a.

In the above embodiment, an electric motor is used as a power means for reciprocating the stripper table.
In addition, a cylinder is used as a power means for reciprocating the flare punch table, but it is essential that the motor be a servo motor, an induction machine, a synchronous machine, and various control motors. Specific mechanism, shape,
Not only is the quantity and the like not limited, but 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 as the power means of the stripper table, and a cylinder is used as the power means of the flare punch table.
The stripper base may be a cylinder, and the flare punch base may be driven by an electric motor. In short, a flare punch base having a flare punch is provided integrally with the stripper base, and the heat exchange is performed by a predetermined power means. If it is configured to reciprocate facing the vessel, it is not always necessary to reciprocate by different power means, the same power means may be provided on both sides, and the stripper base and the flare punch may be further provided by one power means. Both the tables may have a mechanism for reciprocating separately.

Further, it is needless to say that the power means may not be provided integrally with the flare punch table and the stripper table, respectively. It is needless to say that the power means such as an electric motor or a cylinder is provided from each of the flare punch table and the stripper table. It may be separately provided at a predetermined location of the pipe expansion device main body.

Further, in the above-described embodiment, the flare punch table accommodated in the stripper table reciprocates through the expansion and contraction of the rod of the cylinder, and a predetermined number of teeth (engagement) provided on the flare punch table. A guide means is constituted by meshing a pinion (rotating body) having a part) with a rack (rail body) provided in the stripper base. In short, the flare punch base is heated by a predetermined power means. The rack (rail body) as long as it can guide and position reciprocally so as to face the exchanger.
The specific shape of the pin rack, double rack, mangle
A rack or the like may be used, and a rack (rail) need not be provided in the stripper base. A pinion (rotating body) meshing with the rack (rail) may be a pin gear, a worm gear, or the like. The specific mechanism, shape, quantity, attachment point, etc. of the guide means are not limited in any way, and the guide means constituted by a pinion (rotary body) and a rack (rail body) is also indispensable. is not.

The tube expanding device according to one embodiment of the present invention is a vertical tube expanding device erected on a base. In short, a flare punch table is integrally provided on a stripper table. If each of the tables reciprocates separately,
It is needless to say that the stripper table and the flare punch table may be so-called horizontal tube expansion devices, each of which moves substantially parallel to the ground, the floor, or the like.

Further, in the above embodiment, the stripper base is provided with a stripper base guide 8b having a guide roller 8c rotatably engaged with a guide rail 1b engraved on the column 1a. It is important that the stripper table is not necessarily limited to the stripper table guide 8b as long as it restricts the movement of the stripper table in the other direction so as to reciprocate the stripper table along the column 1a. Needless to say, a guide (not shown) or a guide post (not shown) may be used.

Further, in the above-described embodiment, the stripper base is provided with a torque transmitting means such as a chain for transmitting the torque of the electric motor provided on the stripper base, and a speed reducer (not shown) provided at a predetermined location. And a pinion (rotating body) axially attached to a shaft portion extending from the shaft section, and the pinion (rotating body) is meshed with a rack 3 provided on a column of the pipe expansion device main body, so that the pinion (rotary unit) is fitted along the column. Although it is configured to reciprocate, it is not an essential condition in the present invention. For example, it may be configured to reciprocate by being directly attached to a rod of a cylinder (not shown).

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

[0032]

As described above, the present invention includes a stripper for determining the length of a tube protruding from the heat exchanger when the tube inserted in the heat exchanger is expanded, and the heat exchanger. A stripper base provided reciprocally movable facing the vessel, and a flare punch base having a flare punch for performing a predetermined flaring process on an opening of the pipe after the expansion. Since the flare punch table is provided integrally with the stripper table, and reciprocates facing the heat exchanger by predetermined guide means and power means, the protrusion of the tube protruding from the end plate depends on the type of heat exchanger. When setting the length or performing flaring of a predetermined depth on a protruding pipe, not only is the flare punch and stripper replacement work unnecessary, but also instantly and Make the projection length of the tube projecting from the end plate and the depth dimensions of the flared respective separately it is possible to set.

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 partially cutaway side view showing a state near a stripper table having a flare punch table before expansion according to an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing a state in the vicinity of a stripper table having a flare punch table after pipe expansion in one embodiment of the present invention.

FIG. 3 is a front view showing a conventional pipe expanding device.

FIG. 4 is an enlarged sectional view showing a state near a mandrel before pipe expansion in a conventional pipe expansion apparatus.

FIG. 5 is an enlarged cross-sectional view showing a state near a mandrel after pipe expansion in a conventional pipe expansion apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pipe expansion apparatus main body 2 ... Electric motor 2b ... Cylinder 3b ... Rack (rail body) 3c ... Pinion (rotary body) 5 ... Reciprocating body 6 ... Expansion mandrel 7 ... Flare punch stand 7a ... Flare punch 8 ... Stripper stand 8a ... Stripper

Claims (3)

(57) [Scope of request for utility model registration] 1. A stripper (8a) for determining a projecting length of a tube (10) projecting from the heat exchanger (12) when the tube (10) inserted in the heat exchanger (12) is expanded, and facing the heat exchanger (12). And a flare punch table 7 provided with a flare punch 7a for performing a predetermined flaring process 10b at the opening of the pipe 10 after the pipe expansion. And a flare punch table 7 provided integrally with the stripper table 8 and reciprocatingly facing the heat exchanger 12 by predetermined guide means and power means. The guide means comprises a rail provided on the stripper base 8 and a rotating body having a meshing portion capable of meshing with the rail, and the rotating body is provided on the flare punch base 7. The pipe expansion device according to claim 1, wherein: 3. The rack in which the rail has a predetermined length.
The pipe expansion device according to claim 2, wherein the rotating body is a pinion (3c).