JP2901177B2 - 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 tube expansion device, and more particularly, to a plurality of radiating fins forming a heat exchanger, and a hairpin tube inserted into each of the radiating fins. The present invention relates to a tube expansion device for press-fitting a tube expansion mandrel having a tube expansion billet into the hairpin tube to expand the tube.

[0002]

2. Description of the Related Art Conventionally, as a pipe expanding apparatus used for the pipe expanding operation of the heat exchanger, as shown in FIG. 3A, a pair of columns 2 having a predetermined interval and each of the columns 2 are provided. A beam 3 spanned to be connected, a pair of guide posts 4 attached to both ends of the beam 3 to be juxtaposed to each of the columns 2, and slidably mounted on the guide posts 4. A pair of hydraulic cylinders 5 mounted on the beam 3 in an inverted state, and are provided so as to be able to reciprocate via expansion and contraction movements of expansion and contraction rods 5a, and have an expanded billet 7b on one end side; A plurality of through-locking holes 6b are formed to insert and lock each of the plurality of pipe expansion mandrels 7 having the locking portions 7a on the other end side so as to be able to be prevented from being pulled out in one direction through the locking portions 7a. There is an expansion device 1 provided with a press-fitting plate 6 that has been formed, and should still be the mainstream of the expansion device. Used well.

Further, as shown in FIG. 3 (b), the expansion device 1 having the above-described configuration expands a hairpin tube 11 inserted through a large number of radiating fins 12 superposed to complete the heat exchanger 10. At this time, the pressing attachment 8 is inserted into the gap 6c provided in the press-fitting plate 6 so that the pressing pin 8 is extended toward the hairpin tube 11 through the extension of the telescopic rod 5a of the hydraulic cylinder 5 (arrow C). Press-in board 6 moving in the direction (arrow D)
In addition to being able to perform a predetermined pipe expansion operation with the pipe expansion mandrel 7 provided in the, the unused mandrel 7
Is escaped by projecting in the other direction (arrow E) through a mandrel escape hole 8a formed in the pressing attachment 8 in advance and a release hole 6a formed in the center of the press-fitting plate 6 in advance. It is something that can be done.

[0004]

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

That is, in the pipe expanding apparatus having the above structure, each of the plurality of pipe expanding mandrels 7 having the locking portions 7a on the other end side is inserted and locked so as to be prevented from being pulled out in one direction through the locking portions 7a. The press-fitting plate 6 having a plurality of through-locking holes 6b formed therein is connected to the pair of guide posts 4 and the pair of hydraulic cylinders 5.
A predetermined pipe expansion operation can be performed by reciprocating the pipe 11 to be expanded which is positioned in one direction of the press-fitting plate 3 through each of the pipes. A mandrel escape hole 8a formed in the press attachment 8 previously inserted into the gap 6c provided in the press-fitting plate 6; and a relief hole 6a formed in the center of the press-fitting plate 6 in advance.
Can be made to protrude (arrow E) in the other direction through each of them to escape.

Accordingly, each of the pair of guide posts 4 and the pair of hydraulic cylinders 5 is inevitably provided at both ends of the press-fitting plate 6 except for the central portion of the press-fitting plate 6 to which a plurality of pipe expansion mandrels are respectively engaged. Will be located on the side.

Accordingly, since the pair of guide posts 4 are located at both ends of the press-fitting plate 6, the press-fitting plate 6 can smoothly reciprocate. Since the hydraulic cylinder 5 and the telescopic rod 5a of the hydraulic cylinder 5 are also attached to both ends of the press-fitting plate 6 and to the surface of the press-fitting plate 6 except for the center portion of the press-fitting plate 6, the width of the press-fitting plate 6, that is, the pipe expansion device The width of the pipe 1 itself becomes very large, and not only does the pipe expansion / removal device 1 enter and exit a factory or the like, but also the installation space is limited. In any case, the unused mandrel 7 is used when expanding the pipe.
In the pipe expanding apparatus having a configuration in which the press-fitting plate 6 is protruded in the other direction and escapes, the telescopic rod 5a of the hydraulic cylinder 5 is attached to the surface of the press-fitting plate 6 in which the through-locking hole 6b is formed. And the width itself of the pipe expansion device 1 must be large, so that, for example, the tip of the telescopic rod 5a of the hydraulic cylinder 5 is formed on the press-fitting plate 6 excluding the surface portion of the press-fitting plate 6 in which the through-locking hole 6b is formed. By attaching the hydraulic cylinder 5 itself to the peripheral portion (not shown) and positioning the hydraulic cylinder 5 itself between the columns 2, the width of the tube expanding device 1 can be made extremely narrow. ,
Since the guide post 2 inserted into the press-fitting plate 6 is attached to the periphery of the press-fitting plate 6 at a position displaced from the axis thereof, the press-fitting plate 6 having a heavy weight depends on the type of the heat exchanger 10 for expanding the pipe. Must be used, every time the telescopic rod 5a expands and contracts, the press-fitting plate 6 is twisted, and the bearing (not shown) of the press-fitting plate 6 is damaged, and the guide post is damaged. In some cases, a fatal problem may occur such that the accuracy of the reciprocating dimension of the press-fitting plate 6 is reduced, and in any case, the limit depending on the type of the heat exchanger for expanding the pipe is improved. I had to.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and in a pipe expanding apparatus having a configuration in which an unused mandrel is protruded to the other side of the press-fitting board and escaped when the pipe is expanded. reciprocating means, the peripheral portion of the press plate surface portion or piezoelectric Iriban except through locking hole of the mandrel of the press-fitting plate
By setting kicking it, it is possible to truncate the full width of the press plate itself to the limit, by force the installation space also not only can be made compact overall possible and minimize the tube expansion work of any type of heat exchanger In
Also, it is an object to provide an expanding apparatus which can reciprocate the excellent can press fitting machine very smoothly without completely cause the occurrence of twisting in the press-fitting plate.

[0009]

Means for Solving the Problems The present invention employs the following technical means to solve the above problems.

That is, the present invention provides an expanded billet 7b at one end.
And a plurality of through holes for inserting and locking each of the plurality of pipe expanding mandrels 7 having the locking portions 7a on the other end side so as to be able to be locked in one direction through the locking portions 7a. Lock hole
And a reciprocating means for reciprocating the press-fitting plate 6 formed with 6b along the guide post 4 inserted into both ends of the press-fitting plate 6. Means are provided between the pair of columns 2, and the operating portion of the reciprocating means is arranged such that the peripheral portion 6 d of the press-fitting plate 6 located closer to the column 2 than the respective axis positions of the pair of opposed guide posts 4. Alternatively, a pair of rotatable members 6f which are attached to the surface portion 6e of the press-fitting plate 6 excluding the through-locking holes 6b, and on which the rotating bodies 6f provided on the column 2 side of the press-fitting plate 6 are respectively provided. since the rail body 1b is thus provided along the longitudinal direction of the column 2 so as to position inside between the column 2 from the operation unit of the reciprocating means, expanding apparatus truncate the full width of the pressure Iriban 6 to the limit Not only can minimize the overall width of the Together can be minimized even depth (front-rear direction of the thickness) of the tube device can it to prevent twisting into the press plate 6 by Ri to facilitate reciprocation of at press-fitting plate 6 in the tube expansion.

Further, the reciprocating means includes a hydraulic cylinder 5
In addition, one end side of the telescopic rod 5a of the hydraulic cylinder 5 is attached to the peripheral portion 6d of the press-fitting plate 6 or the surface portion 6e of the press-fitting plate 6 excluding the through-locking hole 6b to form an operating portion. One end of the telescopic rod 5a can be attached to the center of the panel 6, and even if the number of hydraulic cylinders 5 is reduced from two to one, the press-fitting panel 6 can be reciprocated in a well-balanced manner. Not only that, the hydraulic cylinder 5 is securely housed between the columns 2 in the pipe expansion device 1, so that the entire height of the pipe expansion device 1 can be suppressed to within the height of the column and the device can be made compact.

Further, the reciprocating means comprises a forward / reverse rotatable ball screw and a female screw or a gear screwed with the ball screw. The surface of the press-fitting plate 6 excluding the part 6d or the through-lock hole 6b
6e to form an operating part, not only can the total height of the pipe expansion device 1 be reliably kept within the height of the column, but also by rotating the ball screw via an electric motor (not shown). Since the press-fitting plate 6 can be reciprocated without generating any noise or the like, an oil temperature control device (not shown) for smoothly operating the hydraulic cylinder is not required at all. Can be provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Note that, in the configuration of the tube expansion device, the description of the same portions as those in the conventional example will be omitted below.

In FIG. 1, reference numeral 1 denotes a vertical movement via a pair of guide posts 4 attached to a beam 3 spanned between a pair of columns 2 erected at a predetermined interval. 1 shows a pipe expanding apparatus provided with a press-fitting plate 6, and 1a shows a pipe expanding apparatus main body.

Reference numeral 1b denotes a pair of guide rails (rails) which are positioned so as to face each of the columns 2 and are provided along the longitudinal direction of the column 2, and each of the guide rails 1b has A rotary roller (rotating body) 6f attached to the column 2 side of the press-fitting plate 6 is rotatably locked to form a cam floor.

Reference numeral 9 denotes a press-fitting plate 6 positioned between the columns 2 and excluding a surface portion 6e of the press-fitting plate 6 in which a through-locking hole 6b for locking a mandrel 7 for expanding the pipe of the press-fitting plate 6 is formed. A press-fitting plate connected body attached to the peripheral portion 6d of the press-fitting plate 9 is shown, and a single hydraulic cylinder is provided between the columns 2 and located at the center of the press-fitting plate 6. 5
Will constitute a working portion at the leading end of the telescopic rod 5a is mounted, the press-fitting plate coupling body 9 also or teeth, before increasing the press-fitting plate 6 during protraction of relaxin reduced the rod 5a (the other direction) it is allowed, yet the press-fitting plate 6 in the contraction time of drawing of the telescopic rod 5a from the lowering (in one direction), not the entire width of the press plate 6 only can minimize the entire width of the expanding apparatus truncated to the limit, The depth (thickness in the front-rear direction) of the tube expansion device having the minimum overall width can be minimized, and the reciprocating motion of the press-fitting plate 6 during the tube expansion can be controlled by the pair of guide posts 4 and the pair of guide rails 1b and preventing twisting, which is composed of each of the rotating rollers 6f you locked in <br/> rolling respectively in the rail 1b guiding
The more smoothly the means, reliably preventing be <br/> Rukoto can twist of the press plate 6.

Further, the telescopic rod of the hydraulic cylinder 5
Since the operating portion at one end of 5a is attached to the press-fitting plate connector 9 of the peripheral portion 6d of the press-fitting plate 6 to constitute the operating portion, the center of the peripheral portion 6d of the press-fitting plate 6 excluding the through-locking hole 6b. Telescopic rod on the part
5a can be attached to one end, and even if one hydraulic cylinder 5 is used, a well-balanced press-fit
Not only can be made to reciprocate, but also by securely storing the hydraulic cylinder 5 between the columns 2 in the expansion device 1, the total height of the expansion device 1 can be suppressed within the height of the column. It can be made compact.

In the above embodiment, the reciprocating means comprises a hydraulic cylinder. For example, instead of a hydraulic cylinder, a forward / reverse rotatable ball screw (not shown) driven via an electric motor is used. a female screw member or gear member screwed to the ball screw (not shown), before Ki圧 Iriban connecting body or the through locking hole may be attached to the surface portion of the press-fitting plate configuration except, this In this case, not only can the overall height of the expansion device be kept within the height of the column,
It is possible to provide an advantage that a pipe expansion device suitable for an environment free of an oil temperature control device and noise can be provided.

Further, in the above embodiment, the hydraulic cylinder raises the press-fitting plate when the telescopic rod is extended, and lowers the press-fitting plate when the telescopic rod is contracted.
Although it is provided upright between a pair of columns, for example, it may be provided in an inverted state between the columns. In this case,
Only the full width of the expansion device can be minimized.

Further, in the above embodiment, the twist preventing hand is used.
Although the step has been described in the case where the cam floor is constituted by the guide rail provided along the longitudinal direction of the column and the rotating roller provided on the press-fitting plate and rolling along the guide rail, it is not always necessary. Without being limited to this, for example, a rail provided along the longitudinal direction of the column,
A so-called LM guide, which is provided on the press-fitting plate and includes a guide body that slides along the rail body, may be used. In this case, the reciprocating press-fitting plate faces the guide post. There is an advantage that a smooth reciprocating motion with higher accuracy and no twist can be received by both of the guide members provided.

In the above-described embodiment, the press-fitting plate may include a pipe expanding billet at one end and a plurality of pipe expanding mandrels having a locking portion at the other end, each of which may be moved in one direction through the locking portion. A plurality of through-locking holes are drilled to insert and lock so that they cannot be pulled out, and when the tube is expanded, an unused mandrel is drilled in a press attachment that is inserted in advance into a gap provided in the press-fitting board. The mandrel escape hole provided and a hole pre-drilled at the center of the press-fitting plate can be protruded to the other direction through each of the escape holes, but the tube is necessarily expanded via the press attachment. It is not necessary to select a mandrel for use. For example, a shield (not shown) that can reciprocate via a cylinder is mounted on the press-fitting plate above the locking portion of the mandrel for pipe expansion, ie, a gap between the press-fitting plate. May be provided in the In this case, there is an advantage that each of the expansion mandrels can be changed instantaneously according to various expansion patterns of the heat exchanger, but the specific means for selecting the expansion mandrels is not limited. Needless to say.

Further, in the above embodiment, a press-fit disc connecting body is provided around the press-fit disc located between the columns.
In addition, the press-fitting plate connecting body is provided with an operating portion of a reciprocating means, but the reciprocating means does not necessarily need to be attached to the press-fitting plate connecting body.
The operating portion may be directly attached to the peripheral portion of the press-fitting plate or attached to a surface portion located between columns of the press-fitting plate excluding the through-locking holes.

Further, in the above-described embodiment, the tube expanding device is a so-called vertical tube expanding device in which a column is erected, but is not necessarily limited to the vertical tube expanding device. It may be a horizontal pipe expanding device that reciprocates in the horizontal direction, and the position of the gap for insertion and insertion of the pressing attachment and the specific shape of the press-fitting plate, as well as a pair of guide posts inserted at both ends of the press-fitting plate. The number may also be configured as a pair by being inserted two by two at both ends of the press-fitting board,
In addition, the specific types of the tube expansion device and the configuration of each of the various components can be freely changed in design within the scope of the present invention.

[0024]

As described above, according to the present invention, the reciprocating means is provided between the pair of columns, and the operating portion of the reciprocating means is moved from the position of each of the opposing guide posts. Attached to the periphery of the press-fitting plate located on the column side or to the surface of the press-fitting plate except for the through-locking holes, and a rotating body provided on the column side of the press-fitting plate can roll on each of the columns. Since the pair of rails is provided along the longitudinal direction of the column so as to be located inside the column between the operating portions of the reciprocating means, the reciprocating means is provided between the pair of columns, and The entire width of the press-fitting plate is reduced by attaching the operating portion of the means to the peripheral portion of the press-fitting plate located on the column side from the respective axis positions of the pair of opposed guide posts or the surface portion of the press-fitting plate except the through-locking hole. Cut to the limit to increase the overall width of the pipe expansion device Not only can be a small,
In addition to minimizing the depth of the pipe expansion device having the minimum overall width, the reciprocating motion of the press-fitting plate at the time of expanding the pipe is to make the press-fitting plate reciprocating at the time of expanding the pipe a pair of guide posts and the guide posts. Through the rails provided on the pair of columns to be located inside the column between the operating portions of the reciprocating means and the rotating bodies provided at both ends on the column side of the press-fitting plate to roll the rails. It is possible to reciprocate smoothly without causing twisting of the press-fitting board more smoothly.

Further, the operating portion of the reciprocating means is attached to the peripheral portion of the press-fitting plate or the surface of the press-fitting plate except the through-locking hole located on the column side with respect to the respective axis centers of the pair of guide posts facing each other. In addition, a pair of rails provided on each of the columns on the column side of the press-fitting plate and on which a guide body is slidable are arranged in a longitudinal direction of the columns so as to be located between the columns of the operating portion of the reciprocating means. If set along
Smooth reciprocating motion with higher accuracy can be achieved without twisting of the press-fitting plate.

Further, the reciprocating means comprises a hydraulic cylinder, and one end of a telescopic rod of the hydraulic cylinder is attached to a peripheral portion of the press-fitting plate or a surface portion of the press-fitting plate except a through-locking hole to constitute an operating portion. As a result, it is possible to attach one end of the telescopic rod to the center of the press-fitting plate, so that even if the number of hydraulic cylinders is reduced from two to one, the well-balanced reciprocation of the press-fitting plate can be performed. Not only is it possible, but also by securely housing the hydraulic cylinder between the columns in the tube expansion device, the overall height of the tube expansion device can be kept within the height of the column, and the tube can be made compact.

Further, the reciprocating means comprises a forward / reverse rotatable ball screw and a female screw or a gear screwed with the ball screw, and the female screw or the gear is connected to a peripheral portion of the press-fitting plate. Or, since it is attached to the surface of the press-fitting plate except the through-locking hole to constitute the operating part, not only can the total height of the pipe expanding device be reliably kept within the height of the column, but also the ball screw can be By rotating, the press-fitting plate can reciprocate without generating any noise, etc., so that no oil temperature control device is required to operate the hydraulic cylinder smoothly, and it is suitable for the environment. Pipe expanding device can be provided.

Therefore, a mandrel that is not used when expanding a pipe is
In a tube expanding apparatus having a configuration in which the press-fitting plate is protruded to the other direction and escaped, the reciprocating means of the press-fitting plate is located between columns of the press-fitting plate except for a through-locking hole of a mandrel of the press-fitting plate. By providing the surface portion or the peripheral portion located between the columns of the press-fitting plate, the entire width of the press-fitting plate itself can be cut down to the limit, and thus the entire installation can be made compact as much as possible to minimize the installation space. Rather, it is intended to provide an extremely excellent pipe expansion device which can reciprocate the press-fitting plate extremely smoothly without causing any twisting of the press-fitting plate at the time of expanding work of any kind of heat exchanger. It has a special effect that it can be done.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a pipe expanding apparatus according to the present invention, wherein FIG. 1A is an enlarged side view of a main part, and FIG.

FIG. 2 is a sectional view taken along line AA of FIG.

FIGS. 3A and 3B show a conventional pipe expanding device, wherein FIG. 3A is an enlarged front view of a main part showing a state before pipe expansion, and FIG. 3B is an enlarged front view of a main part showing a state at the time of pipe expansion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Expansion device 1a ... Expansion device main body 1b ... Rail (guide rail) 4 ... Guide post 5 ... Hydraulic cylinder (reciprocating means) 6 ... Press-fitting plate 6f ... Rotating body (rotary roller) 7 ... Expansion mandrel 8 ... Pressing Attachment 10 ... Heat exchanger

Claims (4)

(57) [Claims] 1. A pair of columns (2) having a predetermined interval
A beam (3) suspended over the column (2); and the beam
A pair of guide posts, one ends of which are attached to both ends of (3), and which are juxtaposed to correspond to each of the columns (2).
(4) a plurality of mandrel for expansion provided with an expansion billet (7b) at one end and a locking portion (7a) at the other end.
A press-fitting plate (6) having a plurality of through-locking holes (6b) for inserting and locking each of (7) in one direction through the locking portion (7a) so as to be able to be locked. And a reciprocating means for reciprocating along the guide post (4) inserted into both ends of the press-fitting plate (6). (2) provided between the two, the operating portion of the reciprocating means, the pair of opposing guide posts (4)
Press-fitting plate located on the column (2) side from the respective axis center positions
(6) is attached to the surface (6e) of the press-fitting plate (6) except for the peripheral portion (6d) or the through-locking hole (6b), and each of the columns (2) has the press-fitting plate (6). ), A pair of rails (1b) on which the rotating body (6f) provided on the side of the column (2) is rotatable can be located between the columns (2) from the operating portion of the reciprocating means. (2) A tube expanding device provided along the longitudinal direction. 2. A pair of columns (2) having a predetermined interval.
A beam (3) suspended over the column (2); and the beam
(3) each end is attached to both ends, and said column
A pair of guide posts arranged side by side for each of (2)
(4) and a plurality of mandrel for expansion provided with an expansion billet (7b) at one end and having a locking portion (7a) at the other end.
A press-fitting plate (6) having a plurality of through-locking holes (6b) for inserting and locking each of (7) in one direction through the locking portion (7a) so as to be able to be locked. And a reciprocating means for reciprocating along the guide post (4) inserted into both ends of the press-fitting plate (6). (2) provided between the two, the operating portion of the reciprocating means, the pair of opposing guide posts (4)
Press-fitting plate located on the column (2) side from the respective axis center positions
(6) is attached to the surface (6e) of the press-fit plate (6) except for the peripheral portion (6d) or the through-locking hole (6b), and each of the columns (2) has the press-fit plate (6). ), A pair of rails (1b) slidable by a guide provided on the column (2) side of the column (2) are located inside the column (2) from the operating portion of the reciprocating means.
(2) A tube expanding device provided along the longitudinal direction. 3. The reciprocating means comprises a hydraulic cylinder (5), and a telescopic rod (5a) of the hydraulic cylinder (5).
Of the press-fitting plate (6) or the through-locking hole (6
3. The expansion device according to claim 1, wherein the expansion device is attached to a surface portion (6e) of the press-fitting plate (6) except for (b) to constitute an operating portion. 4. The reciprocating means comprises a ball screw rotatable in normal and reverse directions and a female screw body or a gear body screwed to the ball screw.
The expansion device according to claim 1 or 2, wherein the expansion portion is attached to a surface portion (6e) of the press-fitting plate (6) except for a peripheral portion (6d) or a through-locking hole (6b) of (6).