KR20100048298A - A tube pitch transfer device of fin-tube welding m/c - Google Patents

Abstract

PURPOSE: An automatic pitch transfer device for a tube of a fin-tube welding machine is provided to prevent welding errors by welding fins in a tube in uniform intervals. CONSTITUTION: An automatic pitch transfer device for a tube of a fin-tube welding machine comprises first and second supports(12,14), first and second linear guides(16,18), tables(20) for transferring a tube, tube clamping devices(22), tube pitch transfer units(24), front tube clamps, rear tube clamps, and joint units. The first and second supports are arranged in both sides of a welding machine body(10). The tube clamping devices are movably placed on the first linear guide. The tube pitch transfer units transfer the tables and the tube clamping devices along the first linear guide. The front tube clamps are installed in the rear end of the first support. The rear tube clamp is movably installed in the second linear guide.

Description

A tube pitch transfer device of fin-tube welding M / C

The present invention relates to a tube automatic pitch feeder of a fin tube welder, and more particularly, to a fin tube welder for welding a metal plate to an outer diameter of a tube in the form of a metal pipe, wherein The present invention relates to a tube automatic pitch feeder of a fin tube welder that clamps the tube firmly during transfer so that the welding process of the fin tube can be continuously performed without errors.

In general, a fin tube welder is a device for welding a rectangular heat dissipation metal plate to an outer diameter of a tube in the form of a metal pipe. And a welder main body for welding the pin to the tube.

In the conventional fin tube welding machine, the tube feeder is provided with rollers at the upper and lower sides, and drives the motor connected to the rollers so that the tube passes between the rotating rollers, that is, the tube is oriented in one direction due to the friction force when rolling the rollers. It works by moving forward and pitch feed.

However, in the above method, a slight slip phenomenon occurs between the roller and the tube when the motor starts and stops, so that not only an error occurs in the pitch transfer of the tube, but also a phenomenon in which the tube rotates, so that an error occurs. There is a problem that the welding state is not constant.

In other words, to weld the pin to a tube of a predetermined length, 400 to 500 pitches are generally carried out per tube. If a small error occurs due to the slip or rotation as described above, the minute error is caused. As it accumulates, the pitch feed error of the tube increases after a certain pitch feed, so that the pins are not welded to the tube constantly.

If the pitch transfer error of the tube accumulates and pins are not welded constantly, dismantling and assembly of the rollers must be performed by personnel at any time in order to correct the pitch transfer error of the tube. And there is a problem such as lowering the productivity.

In addition, the conventional fin tube welding machine is also installed in the discharged portion of the welded fin tube, the welded fin tube is to move on the top of the roller, so it can not catch the deformation of the fin tube by the heat generated during welding There occurs a problem that the fin tube is bent, the welding is poor because the pin tube is shaken when the welding is made in the main body of the welder is separated from the center of the fin tube.

The present invention has been made in order to solve the above problems, the tube is to be pitch-feeding at the correct intervals along the linear guide and at the same time prevent the tube to be transported along the straight guide to rotate during the pitch feed, welded pin It is an object of the present invention to provide a tube automatic pitch feeder of a fin tube welder which prevents the fin tube from being distorted and bent when the tube is discharged.

In order to achieve the above object, the present invention provides a fin tube welder, comprising: first and second pedestals disposed on both sides of a welder body; First and second linear guides assembled in a two-row array on the first and second pedestals; A tube transfer table movably seated on the first linear guide; A tube clamping device assembled on the tube transfer table; Tube pitch transfer means for transferring the tube transfer table and the tube clamping device along the first straight guide; A front tube clamp mounted on the rear end of the first support base; A rear tube clamp movably seated on the second straight guide; The tube clamping device and the front tube clamp and the rear tube clamp is seated at the same time, the joint means for connecting the predetermined position of the tube to be clamped; provides a tube automatic pitch transfer device of the pin tube welder comprising a.

The tube pitch transfer means according to an embodiment of the present invention, the servo motor is mounted to the front end of the first pedestal; First and second bearing supports respectively mounted at the inlet and outlet sides of the first linear guide; A screw rotatably fastened to the first and second bearing supports in place; A pulley rotatably mounted to the front end of the screw protruding from the front end of the first bearing support; A belt connected between the servo motor and the pulley; And a conveying block formed integrally with the bottom surface of the tube conveying table and formed with a screw coupling hole into which the screw is inserted and fastened.

The tube pitch transfer means according to another embodiment of the present invention, the servo motor is integrally mounted on the bottom surface of the tube transfer table; A pinion mounted on an axis protruding to the bottom of the servomotor; And a rack integrally mounted to a lower inner surface of the first linear guide to engage the pinion.

According to still another aspect of the present invention, there is provided a tube pitch transfer means comprising: a partition plate mounted at a predetermined position of a front end portion of the first pedestal and having pitch grooves at equal intervals formed on a circumferential surface thereof; A rack integrally mounted on a bottom surface of the tube transfer table; A pinion meshed with the rack and coaxially connected with the central axis of rotation of the divider; A stopper disposed at one side of the partition plate and inserted into or separated from any one of the pitch grooves; A stopper driving push cylinder which is connected to the stopper and is a driving means for inserting or separating the stopper into any one of the pitch grooves; A partition plate fixing push cylinder disposed at the other side of the partition plate; And a fixed rod connected to the piston of the partition plate fixing push cylinder and inserted into or separated from any one of the pitch grooves.

The tube clamping device according to the present invention comprises: a lower clamp having a groove on which a tube is mounted, the upper surface of which is assembled on the table; A first air cylinder mounted on the table using a bracket; And an upper clamp assembled to the lower piston of the first air cylinder and having a groove in which a tube is seated on a bottom surface of the first air cylinder.

The front tube clamp according to the present invention includes: a lower clamp mounted on an upper surface of the rear end of the first base and having a groove on which the tube is seated; A second air cylinder mounted on the first base using a bracket; And an upper clamp assembled to a lower piston of the second air cylinder and having a groove on which a tube is seated on a bottom surface of the second air cylinder.

The rear tube clamp according to the present invention includes a jig plate movably seated on the second straight guide; And a clamp plate perpendicular to the front and rear portions of the upper surface of the jig plate, integrally assembled, and having a guide hole into which the front end of the tube is inserted.

The joint means according to the present invention comprises: first and second semicircular clamps which are simultaneously inserted into the inner diameters of one tube and the other tube, and the surface of which is embossed; A tab for fastening the boltless wrench bolt formed in the first semicircular clamp; It is characterized by consisting of; a boltless wrench bolt that is inserted into the tab fastened to tighten the first semi-circular clamp and the second semi-circular clamp in close contact with the inner diameter surface of the tube.

The present invention provides the following effects through the problem solving means described above.

According to the present invention, the front, rear and middle portions of the tube are fixed with a clamping device, and the tube is fixed along a linear guide by one of the following methods: a ball screw method, a rack and pinion method, and a partition plate method using a servomotor. Since the pitch can be accurately conveyed, there is an effect that no error occurs at the time of conveying the tube.

In addition, according to the present invention, since the tube is precisely conveyed by a predetermined pitch, it is possible to weld the pins to the tube at regular intervals, thereby preventing the poor welding of the fin tube, as well as the shaking phenomenon during welding by the rear tube clamp. It is possible to prevent the bending of the fin tube generated by heat.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a tube automatic pitch feeder of the fin tube welding machine according to the present invention, Figure 2 is a perspective view showing a pitch feed of the pin tube by the tube automatic pitch feeder of the fin tube welder according to the present invention 3 is a perspective view showing a state in which the fin tube is welded after the pitch transfer by the automatic tube feed device of the fin tube welding machine according to the present invention.

The present invention relates to a fin tube welding machine for welding a pair of rectangular plate-shaped fins at equal intervals along the longitudinal direction of an outer diameter surface of a tube (pipe) of a predetermined length, and in particular, an apparatus for automatically conveying a tube at a constant pitch. It is intended to provide.

To this end, first and second pedestals 12 and 14 are arranged on both sides of the fin tube welder body 10, which is actually welded, and two on the first and second pedestals 12 and 14 are disposed. The first and second linear guides 16 and 18 are assembled integrally in a row arrangement.

In addition, the first linear guide 16 is coupled to the tube transfer table 20 to be linearly movable, the tube clamping device 22 is installed on the tube transfer table 20.

Tube clamping device 22 according to the present invention is a device that tightens and secures the rear end of the tube, is integrally assembled on the tube transfer table 20, the upper surface is formed with a semi-circular groove in which the tube 30 is seated Lower clamp 50 of the structure, the first air cylinder 54 mounted on the bracket 52 standing integrally on one side of the upper surface of the tube transfer table 20, and the lower end of the first air cylinder 54 The upper clamp 56 is integrally assembled with the piston and has a semicircular groove in which a tube 30 is seated on its bottom surface.

Accordingly, the rear end of the tube 30 is seated in the semi-circular groove of the lower clamp 50 of the tube clamping device 22 and the first air cylinder 54 is driven to drive the first air cylinder 54. The upper clamp 56 is lowered toward the tube 30 together with the piston, so that the rear end of the tube 30 is tightened and fixed in the groove of the upper clamp 56 and the lower clamp 50.

According to the present invention, the front tube clamp 26 is installed on the rear end of the first support 12 to tighten and fix the middle portion of the tube 30 during welding.

The front tube clamp 26 is fixedly mounted on the first pedestal 12 so as not to move, and is mounted on an upper surface of the rear end of the first pedestal 12 and a semicircular shape in which the tube 30 is seated. A lower clamp 58 having a groove formed thereon, a second air cylinder 62 assembled on a bracket 60 erected on one side of the upper surface of the first support 12, and the second air cylinder 62. At the same time it is assembled to the lower piston of the lower surface is composed of the upper clamp 64 of the structure in which the semi-circular groove is formed in which the tube 30 is seated.

Therefore, the middle portion of the tube 30 is seated in the groove of the lower clamp 58 of the front tube clamp 26 and the upper clamp 64 together with the piston is driven by the second air cylinder 62. Lowered toward the tube 30, the middle portion of the tube 30 is finally tightened in the groove of the upper clamp 64 and the lower clamp 58 and is fixed.

In addition, according to the present invention, the rear tube clamp 28 is assembled in a linear movement to the second linear guide 18 provided on the second support 14, the rear tube clamp 28 is a tube Before and after the jig plate 66 and the upper surface of the jig plate 66 is seated on the second linear guide 18 so as to be fixed to support the front end of the (30) It consists of a clamp plate (70) having a guide hole (68) which is vertically erected to the part and integrally assembled and the front end of the tube (30) is inserted.

Therefore, the front end of the tube 30 is inserted into the guide hole 68 of the clamp plate 70 is fixed.

As described above, the rear end of the tube 30 having a predetermined length is fixed to the tube clamping device 22, the middle portion of the tube 30 is fixed to the front tube clamp 26 during the welding progress, the tube 30 The front end of the tube is fixed to the rear tube clamp 28 so that the tube 30 does not rotate without being rotated even when the pitch moves, thereby enabling smooth pitch transfer by the tube pitch transfer means 24 described below. .

On the other hand, the tube 30 of a certain length is required to continue the process of welding the pins to the tube by jointing with each other, and this requires a joint means for easily connecting the tube 30 and the tube 30.

As shown in FIG. 4, the joint means 32 of the tube 30 according to the present invention is provided with first and second semicircular clamps 72, 74 having embossing on the surface thereof.

Thus, at the point where the two tubes 30 are connected, one side of the first and second semicircular clamps 72 and 74 overlapped with each other is inserted into the inner diameter of the one tube 30 and at the same time the inner diameter of the other tube 30 is inserted. The other side portions of the first and second semicircular clamps 72 and 74 superimposed on each other are inserted.

Subsequently, the first semi-circular clamp 72 is inserted into and tightened with the boltless wrench bolt 78 into the tabless wrench bolt fastening tab 76 processed therein from the outer diameter surface of the first semi-circular clamp 72. Lifted in the opposite direction to the fastening direction of the boltless wrench bolt 78 and in close contact with the inner diameter surface of each tube 30, the second semi-circular clamp (74) under the pressure when inserting and tightening the boltless wrench bolt 78 It is in close contact with the inner diameter surface of the tube 30.

Accordingly, the first and second semicircular clamps 72 and 74 and the boltless wrench bolts 78 may be easily connected between the tube 30 and the tube 30, and the boltless wrench bolts 78 may be used. If you only loosen the tube 30 can be easily separated again.

Hereinafter, the configuration and operation of the tube pitch transfer means according to the present invention will be described.

One embodiment of the tube pitch transfer means 24 is a front end of the first pedestal 12 (a servomotor 34 mounted at an opposite position where the front tube clamp 26 is installed) and the first straight line. The first and second bearing supports 36 and 38 mounted at the inlet and outlet sides of the guide 16 and the first and second bearing supports 36 and 38 are rotatably fastened in place. Timing belt pulley 42 rotatably connected to the front end of the screw 40, the screw 40, the front end of the screw 40 protruding to the front end of the first bearing support 36, the axis and timing of the servo motor 34 A transfer block having a timing belt 44 connected between the belt pulleys 42 and a screw coupling hole 48 which is integrally mounted to the bottom surface of the tube transfer table 20 and at which the screw 40 is inserted and fastened ( 46).

Referring to Figure 2 attached to the operation of the tube pitch transfer means 24 having such a configuration as follows.

First, the rear end of the tube 30 is fixed by the upper clamp 56 and the lower clamp 50 of the tube clamping device 22 as described above, and formed on the clamp plate 70 of the rear tube clamp 28. The front end of the tube 30 is inserted into the guide hole 68 and fixed.

At this time, the upper clamp 64 of the front tube clamp 26 is separated from the lower clamp 58, and once the middle portion of the tube 30 is left unfixed.

In this state, when a current signal is applied to the servo motor 34, a rotational drive corresponding to one pitch is performed, and thus, the shaft of the servo motor 34 is connected to the timing belt pulley 42 and the timing belt 44. The screw 40 has been rotated in place by one pitch.

Subsequently, the transfer block 46 is advanced by one pitch by rotating the screw 40 in place, and the tube transfer table 20 integrated with the transfer block 46 is the first linear guide 16. A forward by 1 pitch, and the tube clamping device 22 that secures the rear end of the tube 20 on the tube transfer table is also advanced by 1 pitch.

As a result, the tube 20 fixed by the tube clamping device 22 also moves forward by one pitch.

At this time, the clamp plate 70 of the rear tube clamp 28 fixing the front end of the tube 30 and the jig plate 66 integrated with the clamp plate 70 are also the second straight guide 18. Will be advanced by 1 pitch.

On the other hand, after the tube 30 advances one pitch, the welder main body 10 welds the pin 80 to the outer diameter surface of the tube 30, so that the middle part of the tube 30 does not shake during welding. As shown in FIG. 3, the second air cylinder 62 of the front tube clamp 26 is driven to tighten the middle portion of the tube 30 by the upper clamp 64 and the lower clamp 58. It is fixed.

As such, according to the present invention, the pitch cycle of the tube and the welding cycle of the pin are repeated, but no error occurs in the pitch transfer of the tube, so that the welding of the pin to the tube is made at an accurate pitch interval.

Here, look at another embodiment of the tube pitch transfer means as follows.

5 is a side cross-sectional view showing another embodiment of the tube pitch transfer means according to the present invention.

Another embodiment of the tube pitch transfer means 24 focuses on using racks and pinions instead of screws.

That is, the servo motor 34 is fixedly mounted on the bottom of the tube transfer table 20 by using a bracket or the like, and the pinion 84 can be integrally rotated on the shaft protruding to the bottom of the servomotor 34. And the rack 82 engaged with the pinion 84 is integrally mounted on the lower inner surface of the first linear guide 16 so that the tube transfer table 20 is attached to the first linear guide 16. Therefore, it can be transferred at a constant pitch.

In the pitch transfer operation of the tube pitch transfer means according to another embodiment, the pinion 84 rotates one pitch along the rack 82 together with one pitch drive of the servomotor 34, and at the same time the servomotor 34. ) And the tube transfer table 20 integrated with the pinion 84 are advanced by 1 pitch along the first linear guide 16, and the rear end of the tube 30 on the tube transfer table 20 is The tube clamping device 22 that is fixed is also advanced by one pitch, so that the tube 30 that has been fixed by the tube clamping device 22 is also advanced by one pitch.

Here, look at another embodiment of the tube pitch transfer means as follows.

6A and 6B are side cross-sectional and schematic views showing yet another embodiment of a tube pitch transfer means according to the present invention.

Another embodiment of the tube pitch transfer means 24 is characterized by the use of a split plate 88 which rotates one pitch angularly by a push cylinder instead of a servomotor while using a rack and pinion instead of a screw.

Referring to the configuration of the tube pitch transfer means 24 according to another embodiment, the partition plate is mounted in a predetermined position of the front end portion of the first support stand 12 and the pitch groove 86 at equal intervals is formed on the circumferential surface thereof. 88 is provided, the rack 82 is integrally mounted on the bottom surface of the tube transfer table 20.

In addition, the pinion 84 is meshed with the rack 82 and is connected coaxially with the central axis of rotation of the divider 88.

In particular, a stopper 90 is inserted into or separated from any one of the pitch grooves 86 on one side of the divider 88, and at the same time, a piston of the stopper driving push cylinder 92 is connected to the stopper 90. do.

In addition, a split plate fixing push cylinder 94 is disposed on the other side of the divider plate 88, and a piston of the split plate fixing push cylinder 94 is inserted into or inserted into any one of the pitch grooves 86. The fixed rod 96 is disconnected.

Accordingly, the stopper driving push cylinder 92 in a state where the fixing rod 96 of the partition plate fixing push cylinder 94 is retracted and separated from any one of the pitch grooves 86 of the partition plate 88. When the stopper 90 inserted into any one of the pitch grooves 86 of the divider 88 by the piston forward driving of the pusher pushes the divider 88 in the circumferential direction, the divider 88 One pitch each turn.

Subsequently, after one pitch angular rotation of the divider 88, the fixing rod 96 of the push plate fixing cylinder 94 is advanced again to be inserted into the next pitch groove 86 to insert the divider 88 ) Locks the 1-pitch angular rotation.

Accordingly, when the pinion 84 connected to the divider 88 rotates one pitch each time and the rack 82 engaged with the pinion 84 makes one pitch transfer, the rack integrated with the rack 82 is integrated. The tube transfer table 20 is advanced by one pitch along the first linear guide 16, and the tube clamping device 22 which fixes the rear end of the tube 30 on the tube transfer table 20 is also included. As the pitch advances by one pitch, the tube 30 fixed by the tube clamping device 22 also moves forward by one pitch.

In this manner, the tube can be accurately conveyed at a constant pitch even when a rack and pinion is used instead of a screw and a partition plate rotated by one pitch by a push cylinder instead of a servomotor.

1 is a perspective view showing a tube automatic pitch feeder of the fin tube welding machine according to the present invention.

Figure 2 is a perspective view showing that the pitch feed pin tube by the automatic tube feed device of the tube tube according to the present invention.

Figure 3 is a perspective view showing a state in which the fin tube is welded after the pitch feed by the automatic tube feed device of the fin tube welding machine according to the present invention.

Figure 4 is a cross-sectional view showing a joint portion of the tube conveyed by the tube automatic pitch feeder of the fin tube welder according to the present invention.

Figure 5 is a side cross-sectional view showing another embodiment of the tube pitch transfer means of the configuration of the tube automatic pitch transfer apparatus of the fin tube welding machine according to the present invention.

Figures 6a and 6b is a side cross-sectional view and schematic diagram showing another embodiment of the tube pitch transfer means of the configuration of the tube automatic pitch transfer device of the fin tube welder according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: welder body 12: first base

14: 2nd base 16: 1st straight guide

18: 2nd linear guide 20: Tube transfer table

22: tube clamping device 24: tube pitch transfer means

26: front tube clamp 28: rear tube clamp

30 tube 32 joint means

34: servomotor 36: first bearing support

38: second bearing support 40: screw

42: timing belt pulley 44: timing belt

46: transfer block 48: screw coupling hole

50: lower clamp 52: bracket

54: first air cylinder 56: upper clamp

58: lower clamp 60: bracket

62: second air cylinder 64: upper clamp

66: jig plate 68: guide hole

70 clamp plate 72 first semicircular clamp

74: second semi-circular clamp 76: tab for wrenchless bolt tightening

78: solid bolt, 80: pin

82: rack 84: pinion

86: pitch groove 88: partition plate

90: stopper 92: stopper drive cylinder

94: push cylinder for fixing the partition plate 96: fixed rod

Claims (8)

1. A fin tube welder comprising: first and second pedestals (12, 14) disposed on both sides of a welder body (10); First and second linear guides 16 and 18 assembled on the first and second pedestals 12 and 14 in a two-row array; A tube feeding table 20 movably seated on the first linear guide 16; A tube clamping device (22) assembled on the tube transfer table (20); Tube pitch transfer means (24) for transferring the tube transfer table (20) and tube clamping device (22) along the first straight guide (16); A front tube clamp 26 mounted on the rear end of the first support 12; A rear tube clamp 28 movably mounted to the second straight guide 18; And a joint means (32) connecting the tube clamping device (22), the front tube clamp (26) and the rear tube clamp (28) to a predetermined position of the tube (30) to be clamped at the same time. Automatic tube feeder for fin tube welders. The method of claim 1, wherein the tube pitch transfer means 24, A servo motor 34 mounted to the front end of the first support 12; First and second bearing supports 36 and 38 mounted on the inlet and outlet sides of the first linear guide 16, respectively; A screw (40) rotatably fastened in place to the first and second bearing supports (36,38); A timing belt pulley 42 rotatably mounted to the front end of the screw 40 protruding to the front end of the first bearing support 36; A timing belt 44 connected between the shaft of the servo motor 34 and the timing belt pulley 42; Automatically mounted on the bottom surface of the tube transfer table 20 and at the same time the transfer block 46 is formed with a screw coupling hole 48 is inserted and fastened to the screw 40; Pitch feeder. The method of claim 1, wherein the tube pitch transfer means 24, A servo motor 34 integrally mounted on a bottom surface of the tube transfer table 20; A pinion (84) mounted to an axis protruding to the bottom of the servomotor (34); And a rack (82) integrally mounted on the bottom inner surface of the first linear guide (16) to engage with the pinion (84). The method of claim 1, wherein the tube pitch transfer means 24, A partition plate 88 mounted at a predetermined position of the front end of the first pedestal 12 and having a pitch groove 86 at equal intervals formed on a circumferential surface thereof; A rack (82) integrally mounted on a bottom surface of the tube transfer table (20); A pinion (84) meshed with the rack (82) and connected coaxially with the central axis of rotation of the divider (88); A stopper 90 disposed at one side of the dividing plate 88 and inserted into or separated from any one of the pitch grooves 86; A stopper driving push cylinder 92 which is connected to the stopper 90 and is a driving means for inserting or removing the stopper 90 into any one of the pitch grooves 86; A partition plate fixing push cylinder (94) disposed at the other side of the partition plate (88); A fixed rod 96 connected to the piston of the split plate fixing push cylinder 94 and inserted into or separated from any one of the pitch grooves 86; . The method of claim 1, wherein the tube clamping device 22, A lower clamp 50 assembled on the tube transfer table 20 and having a groove on the upper surface of which the tube 30 is seated; A first air cylinder 54 mounted on the tube transfer table 20 using a bracket 52; The upper clamp (56) is assembled to the lower piston of the first air cylinder (54) and has a groove in which the tube (30) is seated on its bottom; automatic tube feed device for a pin tube welder. The method according to claim 1, wherein the front tube clamp 26, A lower clamp 58 mounted on an upper surface of the rear end of the first support 12 and having a groove on which the tube 30 is seated; A second air cylinder (62) mounted on the first support (12) by using a bracket (60); The upper clamp 64 is assembled to the lower piston of the second air cylinder (62) and has a groove in which the tube (30) is seated; the tube automatic pitch feeder of the fin tube welder. The method of claim 1, wherein the rear tube clamp 28, A jig plate (66) movably seated on the second linear guide (18); A clamp plate 70 having a guide hole 68 inserted into the front and rear portions of the jig plate 66 perpendicular to the front and rear portions thereof and integrally assembled therein and inserted into a front end of the tube 30; Automatic tube feeder for pin tube welders. The method according to claim 1, wherein the joint means 32, First and second semicircular clamps 72 and 74 which are simultaneously inserted into the inner diameters of one tube 30 and the other tube 30 at the point where the two tubes 30 are connected, the surface of which is embossed; A tab for a boltless wrench bolt fastening machined from the outer diameter surface of the first semicircular clamp 72 to the inside thereof; A boltless wrench bolt 78 which is inserted into the tab 76 and tightened to closely contact outer diameter surfaces of the first semicircular clamp 72 and the second semicircular clamp 74 to the inner diameter surface of the tube 30; Tube automatic pitch feeder of the fin tube welder, characterized in that consisting of.

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