JP2011185476A - Clamp mechanism, clamp device, and tube expander - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp mechanism capable of surely clamping an outer peripheral face of a heat transfer tube to make a tube expanding work available, even when the width of a fin to which the heat transfer tube is inserted, is narrow, and a distance between the heat transfer tubes is short. <P>SOLUTION: A first arm 3, a second arm 4, a third arm 6 and a forth arm 7 are mounted on a clamp mechanism body oscillatably by a first pin 5 and a second pin 8. Outer faces opposed to each other of one end section of each of the second arm 4 and the third arm 6 are provided with clamp recessed sections 12, 13 for clamping the heat transfer tube. Inner faces opposed to each other, of the other end sections of the first arm 3 and the second arm 4 are provided with wedge receiving sections 15, 16 receiving wedges to allow the second arm 4 to make clamping motion. Inner faces opposed to each other, of the other end sections of the third arm 6 and the forth arm 7 are provided with wedge receiving sections 17, 18 receiving wedges to allow the third arm 6 to make clamping motion. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a clamp mechanism used for clamping a heat transfer tube such as an air conditioner, and also relates to a clamp device and a pipe expansion device provided with the clamp mechanism.

  In the manufacturing process of the cross fin coil of the air conditioner, after inserting a plurality of heat transfer tubes into a plurality of rectangular fins that are stacked with a predetermined interval, a mandrel is inserted into each heat transfer tube, Each heat transfer tube is expanded and fixed to the fin. At this time, it is necessary to clamp the end of the heat transfer tube with a clamp mechanism so that the heat transfer tube does not move.

  Conventionally, as shown in FIG. 15, a clamp mechanism includes a plate-shaped first clamp body 1001 and a plate-shaped second clamp body 1002 facing the first clamp body 1001 (patent). Reference 1 (Japanese Patent Laid-Open No. 63-188433).

  The end surface of the first clamp body 1001 facing the second clamp body 1002 is provided with a plurality of clamp projections 1003A whose tip surface is a semi-cylindrical concave surface and a clamp recess 1003B whose bottom surface is a semi-cylindrical concave surface. ing.

  Further, the end surface of the second clamp body 1002 facing the first clamp body 1001 also has a plurality of clamp protrusions 1004A whose tip surface is a semi-cylindrical concave surface, and a clamp recess 1004B whose bottom surface is a semi-cylindrical concave surface. Is provided.

  When a plurality of heat transfer tubes (not shown) are clamped by the clamp mechanism having the above-described configuration, the heat transfer is transferred to each of the semi-cylindrical concave surface on the distal end surface of the convex portion for clamping 1003A and the semi-cylindrical concave surface on the bottom surface of the concave portion for clamping 1003B. Apply heat tubes.

  Then, as shown in FIG. 16, the second clamp body 1002 is brought close to the first clamp body 1001. At this time, the clamp convex portion 1004A of the second clamp body 1002 is inserted into the clamp concave portion 1003B of the first clamp body 1001, and the first clamp body is inserted into the clamp concave portion 1004B of the second clamp body 1002. A convex protrusion 1003A 1001 is inserted. As a result, the heat transfer tube is also applied to each of the semi-cylindrical concave surface of the tip surface of the clamp convex portion 1004A and the semi-cylindrical concave surface of the bottom surface of the clamp concave portion 1004B. As a result, the outer peripheral surfaces of the plurality of heat transfer tubes are clamped by the semicylindrical concave surface of the first clamp body 1001 and the semicylindrical concave surface of the second clamp body 1002.

  By the way, as shown in FIG. 17, when a plurality of fins 1005 having a width of 20 mm overlapped with a predetermined interval are arranged in the width direction (so-called short direction) of the fins 1005, The distance in the width direction is shortened.

  As a result, the first clamp body 1001 or the second clamp body 1002 does not enter between the heat transfer tube 1006 and another heat transfer tube 1006 adjacent to the heat transfer tube 1006 in the width direction.

  Therefore, the outer peripheral surface of the heat transfer tube 1006 cannot be clamped by the first clamp body 1001 and the second clamp body 1002, and a problem arises that the heat transfer tube 1006 cannot be expanded.

JP-A-63-188433 (FIGS. 1 and 3)

  Therefore, the problem of the present invention is that the outer surface of the heat transfer tubes can be reliably clamped even when the width of the fins through which the heat transfer tubes are inserted is narrow and the distance between the heat transfer tubes is short. It is to provide a clamping mechanism that can be made possible.

(1) In order to solve the above problems, the clamping mechanism of the present invention is
The body,
A first arm and a second arm;
A first pin that attaches a central portion of the first arm and the second arm to the main body so that the first arm and the second arm can swing;
A third arm and a fourth arm juxtaposed to the first arm and the second arm;
The second arm having a central portion of the third arm and the fourth arm attached to the main body so that the third arm and the fourth arm can swing,
Clamp recesses for clamping the heat transfer tubes are formed on the outer surfaces of the one end of the second arm and the third arm facing each other,
A wedge receiving portion that receives a wedge for causing the second arm to perform a clamping operation is formed on the inner surfaces of the other ends of the first arm and the second arm facing each other.
A wedge receiving portion for receiving a wedge for causing the third arm to perform a clamping operation is formed on inner surfaces of the other end portions of the third arm and the fourth arm facing each other.

  According to the said structure, a heat exchanger tube is arrange | positioned between the recessed part for clamp of the one end part of the said 2nd arm, and the recessed part for clamp of the one end part of the 3rd arm. In this state, when the wedge receiving portion at the other end of the first arm and the second arm receives the wedge, the second arm performs a clamping operation, and the clamping recess at one end of the second arm and the third arm Clamp the outer peripheral surface of the heat transfer tube.

  Thus, since the outer peripheral surface of the heat transfer tube is clamped by the second arm and the third arm, the width of the fin through which the heat transfer tube is inserted is narrow, and even when the distance between the heat transfer tubes is short, By inserting the end portions of the second arm and the third arm between the heat transfer tubes, the outer peripheral surface of the heat transfer tube can be reliably clamped, and the tube expansion work can be performed.

(2) In the clamp mechanism of one embodiment,
In the clamping mechanism of (1) above,
An insertion recess for inserting the mandrel is formed on the outer surfaces of the other ends of the first arm and the fourth arm facing each other.

  According to the embodiment, even when the distance between the first pin and the second pin is short, that is, when the distance between adjacent heat transfer tubes is short, the mandrel can be inserted into the recess.

(3) In the clamp mechanism of one embodiment,
In the clamping mechanism of (2) above,
On the outer surface of the one end portion of the first arm and the fourth arm, a recess for clamping that clamps the heat transfer tube is formed,
An insertion recess for inserting the mandrel is formed on the outer surface of the other end of the second arm and the third arm.

  According to the above embodiment, by using a combination of a plurality of the clamp mechanisms, it is possible to simultaneously clamp the outer peripheral surfaces of the plurality of heat transfer tubes and simultaneously expand the plurality of heat transfer tubes.

(4) In the clamp mechanism of one embodiment,
A plurality of clamp mechanisms of (3) above are juxtaposed, and
The main bodies of the plurality of clamp mechanisms are integrated.

  According to the said embodiment, the outer peripheral surface of a some heat exchanger tube can be clamped simultaneously, and a some heat exchanger tube can be expanded simultaneously.

(5) The clamping device of the present invention comprises:
Any one of the above clamping mechanisms (1) to (4);
And a wedge mechanism having a wedge inserted into a wedge receiving portion at the other end of the clamp mechanism.

  According to the above configuration, since the clamp mechanism and the wedge mechanism having a wedge inserted into the wedge receiving portion at the other end of the clamp mechanism, the width of the fin through which the heat transfer tube is inserted is narrow. Even when the distance between the heat transfer tubes is short, the outer peripheral surface of the heat transfer tubes can be reliably clamped and the tube expansion work can be performed.

(6) The tube expansion device of the present invention is
The clamping device of (5) above;
And a mandrel device having a mandrel inserted into the end portion of the heat transfer tube whose outer peripheral surface is clamped by the clamp device.

  According to the above configuration, since the clamp device and the mandrel device having the mandrel inserted into the end portion of the heat transfer tube whose outer peripheral surface is clamped by the clamp device are provided, the width of the fin through which the heat tube is inserted is narrow. Moreover, even if the distance between the heat transfer tubes is short, the outer peripheral surface of the heat transfer tubes can be reliably clamped to perform the tube expansion operation.

  The clamping mechanism of the present invention includes a first arm and a second arm that are swingably connected by a first pin, and a third arm and a fourth arm that are swingably connected by a second pin, The wedges are inserted into the wedge receiving portions at the other ends of the first arm and the second arm and the wedge receiving portions at the other ends of the third arm and the fourth arm, and the outer surfaces of the one end portions of the second arm and the third arm. Since the heat transfer tube is clamped by the clamping recess provided on the outer periphery of the heat transfer tube, even if the width of the fin through which the heat transfer tube is inserted is narrow and the distance between the heat transfer tubes is short Can be reliably clamped and tube expansion work can be performed.

  Since the clamp device of the present invention includes the clamp mechanism and a wedge mechanism having a wedge inserted into the wedge receiving portion at the other end of the clamp mechanism, the width of the fin through which the heat transfer tube is inserted is narrow. Even if the distance between the heat transfer tubes is short, the outer peripheral surface of the heat transfer tubes can be reliably clamped and the tube expansion work can be performed.

  The tube expansion device of the present invention includes the clamp device and a mandrel device having a mandrel inserted into the end of the heat transfer tube whose outer peripheral surface is clamped by the clamp device, so that the width of the fin through which the heat tube is inserted is increased. Even if the distance between the heat transfer tubes is narrow and the distance between the heat transfer tubes is short, the outer peripheral surface of the heat transfer tubes can be reliably clamped to perform the tube expansion operation.

FIG. 1 is a schematic front view of a tube expansion device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the inside of the clamping device of the above-described tube expansion device. FIG. 3 is a schematic front view of the clamping mechanism of the clamping device. FIG. 4 is a schematic perspective view of the first arm. FIG. 5 is a schematic perspective view of the second arm. FIG. 6 is a schematic perspective view of the third arm. FIG. 7 is a schematic perspective view of the fourth arm. FIG. 8 is a schematic side view of the clamping mechanism as seen from the direction of arrow F8 in FIG. FIG. 9 is a schematic side view of the clamping mechanism as seen from the direction of arrow F9 in FIG. FIG. 10 is a schematic cross-sectional view of the clamp mechanism as viewed from line F10-F10 in FIG. FIG. 11 is a schematic bottom view of the clamp mechanism. FIG. 12 is a schematic plan view of the clamp mechanism. FIG. 13 is a schematic diagram for explaining the clamping operation of the clamping mechanism. FIG. 14 is a schematic diagram for explaining the clamping operation of the clamping mechanism. FIG. 15 is a perspective view of a main part of a conventional clamping mechanism. FIG. 16 is another perspective view of the main part of the conventional clamping mechanism. FIG. 17 is a schematic perspective view of a cross fin coil.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a schematic front view of a tube expansion device including a clamp device 103 according to an embodiment of the present invention.

  The tube expansion device includes a base plate 101, a portal frame 102 erected on the base plate 101, a clamp device 103 attached to the frame 102 so as to be movable in a vertical direction, and the clamp device 103. And a control unit 300 for controlling the vertical movement of the clamping device 103.

  The vertical movement of the clamp device 103 is performed by an electric cylinder (not shown).

  The mandrel device 104 includes a main cylinder 105 installed on the upper part 102a of the frame 102, a pressurizing part 106 attached to the column parts 102b and 102c of the frame 102 so as to be movable in the vertical direction, and a lower part of the pressurizing part 106. And a mandrel 108 whose movement direction is regulated in the vertical direction by the mandrel movement direction restriction unit 107.

  A lower end portion of the main cylinder 105 is connected to the upper portion of the pressurizing portion 106, while an upper end portion of the mandrel 108 is connected to the lower portion of the pressurizing portion 106. In addition, two intermediate plates 109A and 109B are arranged below the pressure unit 106. Each of the intermediate plates 109A and 109B and the mandrel movement direction restricting portion 107 is provided with an insertion hole (not shown) through which the mandrel 108 is inserted. The pressurizing unit 106 and the mandrel moving direction restricting unit 107 are attached to the column portions 102b and 102c of the frame 102 so as to be movable in the vertical direction.

  Further, the pressure member 106 and the intermediate plate 109A are connected by a rod 110A, the intermediate plate 109A and the intermediate plate 109B are connected by a rod 110B, and the intermediate plate 109B and the mandrel moving direction restricting portion 107 are connected by a rod 110C. Yes. Thereby, when the pressurizing unit 106 moves in the vertical direction, the mandrel moving direction regulating unit 107 and the intermediate plates 109A and 109B also move in the vertical direction together with the pressurizing unit 106.

  Further, a cross fin coil 201 is disposed below the clamp device 103 and between the column portion 102b and the column portion 102c. The cross fin coil 201 includes a plurality of rectangular fins 202 in plan view that are overlapped with each other and a plurality of heat transfer tubes 203 that are inserted through the plurality of fins 202.

  Each heat transfer tube 203 has an upper end opened and a lower end bent into a substantially U shape. Therefore, a cradle 111 that receives the lower end of each heat transfer tube 203 is provided on the base plate 101.

  Further, the fall prevention portions 112A, 112B, 112C, 112D are provided on the pillar portions 102b, 102c of the frame 102. The fall prevention portions 112A, 112B, 112C, and 112D contact the outer edge portion of the cross fin coil 201 to prevent the cross fin coil 201 from falling.

  Further, the lower end portion of the mandrel 108 is substantially elliptical. As a result, the lower end portion of the substantially elliptical sphere of the mandrel 108 is inserted into the upper end portion of the heat transfer tube 203 so that the upper end portion of the heat transfer tube 203 can be expanded.

  Further, when the lower end of the substantially elliptical sphere of the mandrel 108 is inserted into the upper end of the heat transfer tube 203, the insertion amount of the lower end of the substantially elliptical sphere of the mandrel 108 becomes a preset amount. The control unit 300 controls the main cylinder 105.

  FIG. 2 is a schematic view showing the inside of the clamping device 103. FIG. 3 is a schematic front view of the clamping mechanism 1A of the clamping device 103. FIG.

  As shown in FIGS. 2 and 3, the clamp device 103 includes a plurality of clamp mechanisms 1A, 1B, 1C,... And a single wedge provided on the plurality of clamp mechanisms 1A, 1B, 1C,. And a wedge mechanism 51 having wedges 52A, 52B, 52C,.

  The wedge mechanism 51 has a wedge mechanism main body 53 provided so as to be movable in the vertical direction with respect to the clamp mechanism main body 2. The wedges 52A, 52B, 52C,... Are integrally fixed to the wedge mechanism main body 53.

  Since the clamp mechanism 1A has the same configuration and shape as the other clamp mechanisms 1B, 1C, 1D..., Only the configuration and shape of the clamp mechanism 1A will be described below, and the other clamp mechanisms 1B, 1C, 1D. Description of the configuration and shape is omitted.

  The clamp mechanism 1A includes a clamp mechanism body 2, a first arm 3 and a second arm 4, a first pin 5, a third arm 6 and a second arm juxtaposed to the first arm 3 and the second arm 4, respectively. It has four arms 7 and a second pin 8.

  The clamp mechanism body 2 is a common body of the plurality of clamp mechanisms 1A, 1B, 1C,. At the center of the clamp mechanism 2, the central portions of the first arm 3 and the second arm 4 are attached by the first pin 5, and the central portions of the third arm 6 and the fourth arm 7 are attached by the second pin 8. .

  The first arm 3 and the second arm 4 can swing around the axis of the first pin 5, and the third arm 6 and the fourth arm 7 can swing around the axis of the second pin 8. Yes.

  The first pin 5 supports the first arm 3 so that the lower end surface of the first arm 3 in the drawing is substantially parallel to the horizontal direction, and the lower end surface of the second arm 4 in the drawing is horizontal. The second arm 4 is supported so as to be inclined with respect to the direction.

  The second pin 8 supports the first arm 3 so that the lower end surface of the third arm 6 in the drawing is substantially parallel to the horizontal direction, and the lower end surface of the fourth arm 7 in the drawing is horizontal. The fourth arm 7 is supported so as to be inclined with respect to the direction.

  That is, due to the support of the first pin 5 and the second pin 8, the distance between the one end of the second arm 4 and the one end of the third arm 6 at the time of non-clamping is the same as the one end of the second arm 4 at the time of clamping. The distance from one end of the third arm 6 is longer.

  4 is a schematic perspective view of the first arm 3, FIG. 5 is a schematic perspective view of the second arm 4, FIG. 6 is a schematic perspective view of the third arm 6, and FIG. 7 is a schematic perspective view of the fourth arm 7. FIG. 8 is a schematic side view of the clamp mechanism 1A viewed from the direction of arrow F8 in FIG. 3, and FIG. 9 is a schematic side view of the clamp mechanism 1A viewed from the direction of arrow F9 in FIG.

  As shown in FIGS. 4 to 7, the first arm 3, the second arm 4, the third arm 6, and the fourth arm 7 are each composed of a substantially disc-shaped central part and a substantially square connected to the central part. It consists of both ends of the middle shape. The thickness of the both end portions is almost twice the thickness of the central portion. As a result, as shown in FIGS. 8 and 9, when the central portion of the first arm 3 and the central portion of the second arm 4 are overlapped, in the direction perpendicular to the axis of the first pin 5, One end of one arm 3 is opposed to one end of the second arm 4, and the other end of the first arm 3 is opposed to the other end of the second arm 4. Similarly, when the central portion of the third arm 6 and the central portion of the fourth arm 7 are overlapped, one end portion of the third arm 6 is in the direction perpendicular to the axis of the second pin 8. The one end of the fourth arm 7 is opposed to the other end of the third arm 6 and the other end of the fourth arm 7 is opposed to the other end.

  Also, as shown in FIGS. 4 to 7, a substantially disk-shaped pin that fits the heads of the first pin 5 and the second pin 8 in the center of the first arm 3 and the third arm 6. The fitting recesses 3a and 6a and the pin insertion holes 3b and 6b through which the shaft portions of the first pin 5 and the second pin 8 are inserted are provided. Further, pin insertion holes 4 a and 7 a through which the shaft portions of the first pin 5 and the second pin 8 are inserted are also provided in the central portions of the second arm 4 and the fourth arm 7.

  FIG. 10 is a schematic cross-sectional view of the clamp mechanism 1A viewed from the line F10-F10 in FIG. FIG. 11 is a schematic bottom view of the clamp mechanism 1A. FIG. 12 is a schematic plan view of the clamp mechanism 1A.

  As shown in FIGS. 10 and 11, a clamping recess having a substantially arc-shaped cross section is formed on the outer surface on the right side of the one end portion of the first arm 3 (the outer surface opposite to the one end portion side of the second arm 4). 11 is formed.

  Further, a clamp recess 12 having a substantially arc-shaped cross section is formed on the left outer surface of the second arm 4 in the drawing (the outer surface facing the one end of the third arm 6).

  A clamp recess 13 having a substantially arc-shaped cross section is formed on the right outer surface of the third arm 6 in the drawing (the outer surface facing the one end of the second arm 4).

A clamp recess 14 having a substantially arc-shaped cross section is formed on the left outer surface of the fourth arm 7 in the drawing (the outer surface opposite to the one arm side of the third arm 6). Each of the concave portions 11 to 14 has a shape that can be brought into close contact with a part of the outer peripheral surface of the heat transfer tube 203. The clamp recess 11 has the same shape as the clamp recess 13, and the clamp recess 12 has the same shape as the clamp recess 14. More specifically, the lower ends of the clamping recesses 11 to 14 are formed so that the radius of curvature gradually increases toward the lower end. Further, in the concave portions 11 and 13 for clamping, the radius of curvature of the portion other than the lower end portion is substantially constant, but in the concave portions 12 and 14 for clamping, the radius of curvature of the upper end portion is made larger than the radius of curvature of the central portion ( (See FIGS. 5, 7, and 8).

  As shown in FIGS. 10 and 12, a wedge receiving portion 15 is formed on the inner surface on the right side of the other end of the first arm 3 (the inner surface facing the other end of the second arm 4). Yes. On the other hand, on the left outer surface of the other end portion of the first arm 3 in the drawing (the outer surface facing the other end portion of the fourth arm 7), the insertion recess 19 having a substantially circular arc shape for inserting the mandrel 108 is inserted. Is forming.

  A wedge receiving portion 16 is formed on the inner surface on the left side in the drawing of the other end portion of the second arm 4 (the inner surface facing the other end portion of the first arm 3). On the other hand, on the outer surface on the right side in the drawing of the other end portion of the second arm 4 (the outer surface opposite to the other end portion side of the first arm 3), an insertion having a substantially arc-shaped cross section for allowing the mandrel 108 to be inserted. A common recess 21 is formed.

  A wedge receiving portion 17 is formed on the inner surface on the right side in the drawing of the other end portion of the third arm 6 (the inner surface facing the other end portion of the fourth arm 7). On the other hand, on the outer surface on the left side in the drawing of the other end of the third arm 6 (the outer surface on the opposite side to the other end of the fourth arm 7), an insertion having a substantially arc-shaped cross section for inserting the mandrel 108 is inserted. A common recess 22 is formed.

  A wedge receiving portion 18 is formed on the inner surface on the left side of the other end portion of the fourth arm 7 in the drawing (the inner surface facing the other end portion of the third arm 6). On the other hand, on the right outer surface of the fourth arm 7 in the drawing (the outer surface facing the other end of the first arm 3), a recess 20 for insertion having a substantially arc-shaped cross section for allowing the mandrel 108 to be inserted. Is forming.

  Any one of the wedges 52A, 52B, 52C,... Is inserted between the wedge receiving portion 15 and the wedge receiving portion 16 in order to cause the second arm 4 to perform a clamping operation. Further, any one of the wedges 52A, 52B, 52C,... Is inserted between the wedge receiving portion 17 and the wedge receiving portion 18 in order to cause the fourth arm 7 to perform a clamping operation.

  The curvature radii of the curved surfaces of the insertion recesses 19, 20, 21, and 22 are set larger than the maximum radius of the lower end portion of the substantially elliptical shape of the mandrel 108. Thereby, the substantially elliptical lower end of the mandrel 108 passes between the insertion recess 19 and the insertion recess 20 and can be inserted into the upper end of the heat transfer tube 203.

  According to the pipe expansion device having the above-described configuration, as shown in FIGS. 1 and 13, the clamping device 103 is lowered with respect to the cross fin coil 201, and the clamping recess 12 at one end of the second arm 4 and the first The upper end of the heat transfer tube 203 is inserted between the clamp arm 13 at one end of the three arms 6, and the clamp recess 11 at one end of the first arm 3 and the clamp at one end of the fourth arm 6. The upper end of another heat transfer tube 203 is also inserted between the recess 14.

  Next, as shown in FIG. 14, the wedge mechanism main body 53 is lowered with respect to the first arm 3 to the fourth arm 7. Then, the wedges 52B, 52D, 52F,... Are inserted between the wedge receiver 15 at the other end of the first arm 3 and the wedge receiver 16 at the other end of the second arm 4. As a result, the one end of the second arm 4 swings so as to approach the one end of the third arm 6, and the heat transfer tube 203 is moved between the one end of the second arm 4 and the one end of the third arm 6. The outer peripheral surface is securely clamped.

  Further, when the wedges 52B, 52D, 52F,... Are inserted, the wedges 52A, 52A, between the wedge receiver 17 at the other end of the third arm 6 and the wedge receiver 18 at the other end of the fourth arm 7 are inserted. 52C, 52E,... Are inserted. As a result, one end of the fourth arm 7 swings away from one end of the third arm 6, and another heat transfer tube 203 is formed between the one end of the first arm 3 and the one end of the fourth arm 7. The outer peripheral surface of is securely clamped.

  Next, as shown in FIG. 1, the mandrel 108 is lowered by pressurization of the main cylinder 105, and the lower end portions of the plurality of mandrels 108 are inserted into the insertion recess 19 and the insertion recess 20. And between the insertion recess 21 and the insertion recess 22, the heat transfer tube 203 is inserted into the upper end portion. Thereby, the upper end part of the said some heat exchanger tube 203 is expanded simultaneously.

  Thus, since the heat transfer tube 203 is clamped by the first arm 3 to the fourth arm 7, the width of the fin 202 through which the heat transfer tube 203 is inserted is narrow, and the heat transfer tube 203 is close to the back side. Even when there are other heat transfer tubes, by inserting one end portions of the first arm 3 to the fourth arm 7 between the heat transfer tubes 203, the second arm 4 and the fourth arm 7 are clamped. The outer peripheral surface of the heat transfer tube 203 can be reliably clamped, and tube expansion work can be performed.

  Therefore, as shown in FIG. 17, the pipe expansion device has a heat transfer tube 1006 even when a plurality of fins 1005 with a width of 20 mm overlapped with a predetermined interval are arranged in the width direction of the fins 1005. Can be expanded.

  Moreover, even if the said pipe expansion apparatus is a cross fin coil which has a step part in the upper part as shown to FIG.15, FIG.16, FIG.14 of Unexamined-Japanese-Patent No. 2001-212634, this heat transfer pipe of this crossfin coil is expanded. it can.

  Further, since the insertion recesses 19 and 20 for inserting the mandrel 108 are formed on the opposing outer surfaces of the other ends of the first arm 3 and the fourth arm 7, the first pin 5 and the second arm Even when the distance to the pin 8 is short, that is, when the distance between the heat transfer tubes 203 adjacent to each other in the longitudinal direction of the fin 202 is short, the mandrel 108 can be inserted into the insertion recesses 19 and 20.

  In addition, clamping recesses 11 and 14 for clamping the heat transfer tubes 203 are formed on the outer surfaces of the first arm 3 and the fourth arm 7, and the other ends of the second arm 4 and the third arm 6. Since the insertion recesses 21 and 22 for inserting the mandrel 108 are formed on the outer surface of the unit, the outer peripheral surfaces of the plurality of heat transfer tubes 203 are clamped at the same time, and the upper ends of the plurality of heat transfer tubes 203 are simultaneously Can be expanded.

  Further, since all the first arm 3 to the fourth arm 7 of the plurality of clamp mechanisms 1A, 1B, 1C,... Are attached to the clamp mechanism body 2, all the first arms can be obtained without complicated control. The arm 3 to the fourth arm 7 can be lowered simultaneously.

  In the above embodiment, the clamp device 103 includes the plurality of clamp mechanisms 1A, 1B, 1C,..., But includes any one of the plurality of clamp mechanisms 1A, 1B, 1C,. Also good.

  In the above embodiment, the distance between one end of the second arm 4 and one end of the third arm 6 at the time of non-clamping is the distance between one end of the second arm 4 and one end of the third arm 6 at the time of clamping. You may attach a spring to the 1st arm 3-the 4th arm 7 so that it may become longer. For example, a spring that biases the other end of the second arm 3 in a direction approaching the other end of the first arm 3, and the other end of the fourth arm 7 is connected to the other end of the third arm 6. A spring that biases in the approaching direction may be used. If these springs are used, the distance between one end of the second arm 4 and the one end of the third arm 6 at the time of non-clamping is set so that the distance between the one end of the second arm 4 and the one end of the third arm 6 at the time of clamping. It can be surely longer than the distance between. Therefore, the heat transfer tube 203 is easily arranged between the one end portion of the second arm 4 and the one end portion of the third arm 6.

  In the above embodiment, the main bodies of the plurality of clamp mechanisms 1A, 1B, 1C,... Are integrated, but the main bodies of the plurality of clamp mechanisms 1A, 1B, 1C,.

  When each main body of the plurality of clamp mechanisms 1A, 1B, 1C,... Is individually provided, each main body may be independently movable in the vertical direction.

  In the above embodiment, the clamp device 103 is attached to the frame 102 so as to be movable in the vertical direction. However, the clamp device 103 may be fixed to the frame 102 so as not to be movable in the vertical direction.

  When the clamp device 103 is fixed to the frame 102 so as not to be movable in the vertical direction, a lifting device that lifts and lowers the cross fin coil 201 may be provided.

  In the above embodiment, the clamping device 103 is moved in the vertical direction by the electric cylinder. However, for example, the clamping device 103 may be moved by a ball screw and a servo motor (not shown) that rotates the ball screw. Alternatively, it may be performed with a chain or the like.

1A, 1B, 1C, ... Clamp mechanism 2 Clamp mechanism body 3 First arm 4 Second arm 5 First pin 6 Third arm 7 Fourth arm 8 Second pin 11, 12, 13, 14 Clamp recess 15, 16 , 17, 18 Wedge receiving portion 19, 20, 21, 22 Insertion recess 51 Wedge mechanism 52A, 52B, 52C, ... Wedge 53 Wedge mechanism main body 101 Base plate 102 Frame 103 Clamp device 104 Mandrel device 105 Main cylinder 106 Pressure unit 107 Mandrel movement direction regulating part 108 Mandrel 109A, 109B Intermediate plate 110A, 110B, 110C Rod 111 Receiving base 112A, 112B, 112C, 112D Fall prevention part 201 Cross fin coil 202 Fin 203 Heat transfer tube

Claims (6)

The body (2),
A first arm (3) and a second arm (4);
A first pin (1) is attached to the main body (2) so that the central portions of the first arm (3) and the second arm (4) can swing the first arm (3) and the second arm (4). 5) and
A third arm (6) and a fourth arm (7) juxtaposed to the first arm (3) and the second arm (4);
The second pin with the central part of the third arm (6) and the fourth arm (7) attached to the main body (2) so that the third arm (6) and the fourth arm (7) can swing. (8)
Clamping recesses (12, 13) for clamping the heat transfer tube (203) are formed on the outer surfaces of the second arm (4) and the third arm (6) facing each other.
On the inner surfaces of the other ends of the first arm (3) and the second arm (4) opposite to each other, wedges (52B, 52D, 52F,...) Are provided to cause the second arm (4) to perform a clamping operation. A wedge receiving portion (15, 16) for receiving
On the inner surfaces of the other end portions of the third arm (6) and the fourth arm (7) facing each other, wedges (52A, 52C, 52E,...) For clamping the third arm (6). A clamp mechanism characterized in that a wedge receiving portion (17, 18) for receiving a screw is formed. The clamping mechanism according to claim 1, wherein
Insertion recesses (19, 20) for inserting the mandrels (108) are formed on the outer surfaces of the other ends of the first arm (3) and the fourth arm (7) facing each other. Features a clamping mechanism. The clamping mechanism according to claim 2,
Clamping recesses (11, 14) for clamping the heat transfer tube (203) are formed on the outer surfaces of one end portions of the first arm (3) and the fourth arm (7),
Insertion recesses (21, 22) for inserting the mandrels (108) are formed on the outer surfaces of the other ends of the second arm (4) and the third arm (6). Clamp mechanism. A plurality of clamp mechanisms (1A, 1B, 1C,...) According to claim 3 are juxtaposed, and
A clamp mechanism characterized in that a main body (2) of the plurality of clamp mechanisms (1A, 1B, 1C, ...) is integrated. Clamp mechanism (1A, 1B, 1C, ...) according to any one of claims 1 to 4,
A wedge mechanism (51) having wedges (52A, 52B, 52C,...) Inserted into wedge receiving portions (15, 16, 17, 18) at the other end of the clamp mechanism (1A, 1B, 1C,...). A clamping device comprising: Clamping device (103) according to claim 5,
A tube expansion device comprising: a mandrel device (104) having a mandrel (108) inserted into an end portion of a heat transfer tube (203) whose outer peripheral surface is clamped by the clamp device (103).

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