JPS6366622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is a method of bending and meandering a flat tube made of extruded aluminum (including aluminum alloy), which is used for heat exchangers such as car cooler condensers and evaporators. The present invention relates to an apparatus for manufacturing meandering tubes for heat exchangers.

Conventional technology Conventionally, flat tubes used in aluminum heat exchangers are cut to a certain length, and then
A heat exchanger was manufactured by bending the tube into a serpentine shape and combining the header and corrugated fins with the serpentine tube. By the way, in a conventional tube bending device, a flat regular tube is placed between a fixed roller that is the center of rotation and a bending roller that rotates around this roller. After this tube is pulled out a predetermined length forward from both rollers, the bending rollers move the tube from right to left about the fixed roller. By moving 180 degrees, the tube is bent, and then the bent front end is sent out a predetermined length, and then the bending roller returns about 180 degrees from left to right with the fixed roller as the center. The tube is bent to the opposite side, and this operation is repeated to produce a serpentine tube (see, for example, Japanese Patent Publication No. 17311/1983 and Japanese Patent Publication No. 17312/1983). however,
According to such conventional devices, the bending roller rotates around the fixed roller, and the tube is bent along the fixed roller, so that the elongation of the tube that occurs during bending is avoided. This affects the length of the straight section of the meandering tube after bending, causing variations in the length of the straight section of the meandering tube, resulting in a problem of very poor dimensional accuracy. Moreover, since the tube is bent by alternately folding back and bending it to the left and right sides around the fixed roller, there is inevitably variation in the bending angles on the left and right sides, and the overall outline of the resulting meandering tube is not rectangular when viewed from the front. It becomes a diamond shape,
There was a problem of producing defective products.

Purpose of the Invention The present invention solves the above problems, and prevents the elongation of the bent portion due to bending of the tube from affecting the length of the straight portion of the tube, and furthermore, the tube is always moved only in one direction. It can be bent and there is less variation in the tube bending angle.
Thereby, the present invention aims to provide an apparatus for manufacturing a meandering tube for a heat exchanger, which can efficiently and automatically manufacture a meandering tube with high dimensional accuracy and having a desired rectangular outline when viewed from the front.

Structure of the Invention In order to achieve the above-mentioned object, the present invention provides a tube that clamps a fixed-length tube placed on a table from both left and right sides using a pair of tube clamps and feeds the same forward a required length. A pinch feeding device, and a chuck member that is freely movable back and forth and rotatable, which grabs the front end of the tube fed out by the tube pinch feed device, pulls out the tube a predetermined length, and flips it upside down. A tube drawer reversing device having a tube drawer, a pair of left and right rotary clamps that clamp the rear end of the drawer part of the tube after the drawer has been reversed and bend the drawer part in a folded shape only in a certain direction, and a side opposite to the folded side. The gist of this invention is a manufacturing device for a meandering tube for a heat exchanger, which is equipped with a tube bending device having a presser clamp that presses the tube from one side to the other.

Embodiments Next, embodiments of the present invention will be described based on the drawings.

In this specification, front and back and left and right are based on Figure 2, where the front refers to the left side of Figure 2, the rear refers to the right side, the left refers to the lower side of Figure 2, and the right refers to the upper side of Figure 2. .

First, in FIGS. 15 to 17, a flat tube 1 made of an extruded aluminum material and having a plurality of fluid passages and wound into a coil is automatically cut into a fixed length by an automatic tube cutting device X. Then, the regular length tube 1 is bent into a serpentine shape by the serpentine tube manufacturing apparatus Y for a heat exchanger according to the present invention, thereby manufacturing a serpentine tube for constructing a heat exchanger.

First, the tube automatic standard length cutting device X will be explained.

In this device Reference numeral G designates a tube delivery device that feeds out the tube 1 by a relatively short required length so that the front end portion of the tube 1 is clamped by a pair of clamping members of the tube drawing device J. The tube drawing device J moves along the frame 154 while holding the front end portion of the tube 1 fed out by the tube feeding device G between a pair of clamping members, and pulls out the tube 1 to a required length. It is something. Reference numeral H has a rear chuck device that grips the rear end of the tube 1 pulled out in this way, and K has a front chuck device L that grips the front end of the tube 1 and straightens the tube 1 by pulling it before cutting. A tube cutting length adjustment device that is freely movable back and forth and has a tube tension straightening device M, N is a front tube cutting machine that is attached to this adjustment device K and cuts a predetermined portion of the front end of the tube 1 after tension straightening, and I is a front side This is a rear tube cutting machine that cuts a predetermined portion of the rear end of the tube 1 at the same time as the cutting by the tube cutting machine N. P
1 is a large number of transport conveyors that drop the fixed length tubes 1 cut to a certain length by the front and rear tube cutting machines I and N into the fixed length tube receiving gutter 155 provided on the left side wall of the frame 154. They are arranged in parallel at predetermined intervals in the direction. R
is a fixed-length tube raising device disposed at the rear end of the receiving gutter 155;
Horizontal fixed length tube 1 dropped into the bottom of 5
In order to supply the tube to the later meandering tube manufacturing equipment, it is raised horizontally and vertically with one side edge down and the other side edge up. S is a fixed length tube feeding device provided in the receiving gutter 155, and this has vertical rollers 156, 156 which can be opened and closed, and are arranged in pairs at predetermined intervals in the front and rear.

Next, the operation of the tube automatic length cutting device X will be explained.

First, the tube 1 is fed out to a required length from the tube stand E by the action of the tube feeding device G. At the same time, the tube curl correction device F acts to correct the curl of the tube 1. On the other hand, the tube pull-out device J is initially placed on standby at the rear end of the frame 154, and clamps the portion of the tube 1 near the front end that has been sent out with its pair of clamping members. Next, in this state, the tube drawing device J is moved forward, thereby drawing out the tube 1 to a required length. Of course, the curl of the tube 1 that has been pulled out has been corrected by the action of the curl correction device F. The stopping position of the tube cutting length adjusting device K is determined in advance according to the cutting length of the tube 1 (this corresponds to the size of the heat exchanger), and the tube 1 is pulled out by the tube drawing device J. The front end portion of the tube cutting length adjusting device K is inserted between the upper and lower holding members of the front end chuck device L provided in the tube cutting length adjusting device K. Next, the front chuck device L and the rear chuck device H operate simultaneously, and the front and rear ends of the drawer portion of the tube 1 are grasped at the same time, and in this state, the tube 1 is pulled forward by the operation of the tension straightening device M. , the tube 1 is finally straightened. Next, both front and rear tube cutting machines N and I
are operated at the same time, and the tube 1 is cut to a certain length. In this way, the tube 1 is cut after the curls are corrected and the length is also corrected, so that the cut dimensions of the tube 1 are extremely accurate. After cutting, the regular length tube 1 is placed on a number of conveyors P, and is dropped into the regular length tube receiving gutter 155 by the conveying action of the conveyors P. In the gutter 155, the fixed length tube 1 is raised horizontally and vertically by the action of the fixed length tube raising device R with one side edge down and the other side edge up. It is sandwiched between multiple sets of vertical rollers 156, 156 and sent to the heat exchanger meandering tube manufacturing apparatus Y according to the present invention.

Next, an apparatus Y for manufacturing a meandering tube for a heat exchanger according to the present invention will be explained.

In FIGS. 1 and 2, a flat tube 1 made of extruded aluminum having multiple fluid passages is shown.
is cut to a constant length by the tube automatic length cutting device X as described above. 2 is a table on which the flat regular tube 1 is placed vertically horizontally with one side edge down and the other side up; A tube clamping and feeding device that clamps a flat fixed-length tube 1 from both left and right sides by a pair of tube clamping and feeding clamps 3 and 4 and feeds it forward a required length. A tube drawer reversing device includes a chuck member 45 that can freely move back and forth and rotate freely, grasping the front end of the tube 1 that has been sent out, pulling out the tube 1 by a predetermined length, and inverting it so that it is upside down; C is a drawer; A pair of left and right rotary clamps 70, 71 that clamp the rear end of the drawn-out portion 1a of the tube 1 after inversion and bend the drawn-out portion 1a in a fixed direction only in a folded shape, and the tube is inserted from the side opposite to the folded side. D is a tube bending device having a presser clamp 72 for holding down the table 2;
0 is a table auxiliary plate swinging device.

Next, the detailed structure and operation of each of the above devices will be explained.

Tube clamp feeding device A shown in Figures 3 to 5
, 5 is an opening/closing device which is arranged below the table 2 and opens and closes the pair of left and right tube clamps 3 and 4, and 6 is a long tube clamp 3 and 4 that is long in the front and back of the rear side of the central part of the table 2. A lifting device 7 is used to raise and lower the tube so as to protrude above or sink into the table 2 from the notch 8, and 7 is a back-and-forth moving device that moves the tube clamps 3 and 4 back and forth together with the opening/closing device 5 and the lifting device 6. be.

In the opening/closing device 5, reference numerals 10, 10 denote a pair of left and right opening/closing cylinders, which are horizontally attached to outer walls 13a, 13a of guide frames 13, 13 provided on both left and right sides of the upper plate 12, respectively. . 14, 14 are slide plates attached to the tips of the piston rods 11, 11 of both cylinders 10, 10, and the side edges of this are the guide frames 13,
Guide groove 1 provided on the inside of both front and rear walls of 13
5, 15 so as to be guided. 16 and 17 are both slide plates 14 and 14
The right tube clamp 4 is attached to the vertical part of the right mounting member 16, and the small clamping cylinder is attached to the vertical part of the left mounting member 17. A left tube clamp feed clamp 3 is attached via 18. 19, 19 is guide frame 2
3 and 23, and the stop positions of the slide plates 14 and 14, that is, the stop positions of the clamps 3 and 4 facing each other, are determined by the screwed-in lengths of the tips of these stoppers. It will be done.

In the elevating device 6, 20 is an elevating cylinder, which is attached to the center of the longitudinal movement board 22 with its piston rod 21 facing upward, and the upper end of the piston rod 21 is connected to the upper plate via a connecting member 23. 12 is connected to the center of the bottom surface. 2
Reference numerals 4 and 24 denote positioning bars that are attached in a hanging manner on both left and right sides of the lower surface of the upper plate 12, and these bars 24 and 24 are connected to guide tubes 25 and 25 that are vertically provided on both left and right sides of the back and forth movement board 22. inserted inside.

In the longitudinal movement drive device 7, reference numerals 26, 26 denote a pair of left and right sliding members and a pair of front and rear slide members provided on both sides of the lower surface of the longitudinal movement base plate 22, which are attached to the base 28.
It is placed on guide rails 27, 27 provided above so as to be movable back and forth. Reference numeral 30 denotes a cylinder for longitudinal movement, which is horizontally attached via a bracket 33 to the rear end of a rack guide 32 having a groove-shaped cross section. A rack 34 is attached to the tip of the piston rod 31 of the cylinder 30, and is fitted into the rack guide 32 so as to be slidable back and forth. The pinion 35 is engaged with the rack 34, and the pinion 36 is rotatably supported at both ends by a pair of left and right bearings 37, 37. 38 is a swinging arm attached to the pivot 36; 39 is a connecting plate connected to the tip of the swinging arm 38 by a pin 40; the connecting plate is generally wedge-shaped when viewed from the side; the front end of this is connected to a roughly U-shaped bracket 41; It is coupled to the rear edge of the longitudinally movable base plate 22 via a pin 42 .

The operation of the tube feeding device A will be explained below.

A straight flat tube 1 cut to a certain length by an automatic tube cutting device X is placed on a table 2.
Initially, the front end of the tube 1 reaches the tube drawer reversing device B, and this device B
After the tube 1 is pulled out a predetermined length by the operation of the tube bending device C, the first tube is pulled out by the operation of the tube bending device C.
A next bending operation is performed. After this bending operation, the middle part of the length of the tube 1 is folded into the opening/closing device 5.
A pair of tube clamps 3 in an open state due to the operation of left and right opening/closing cylinders 10, 10,
Inserted between 4 comrades. Then both cylinders 1
The piston rods 11 and 11 of 0 and 10 protrude simultaneously and both clamps 3 and 4 are almost closed, and the small clamping cylinder 18 is operated to finally close both clamps 3 and 4 and the front end portion of the tube 1 is closed. Being pinched. Next, the longitudinal movement device 7
The piston rod 31 of the cylinder 30 for longitudinal movement
retracts, which causes the rack 34 to retreat and the pinion 35 to rotate;
The pivot shaft 36 rotates, causing the swinging arm to swing from the rear toward the front, and as the arm 38 swings, the back-and-forth movable board 22 is moved along the guide rails 27, 27 via the connecting plate 39. The tube 1, which is clamped by a pair of clamps 3 and 4 on the back-and-forth movable base plate 22, is then moved forward a predetermined distance.

The tube 1 thus sent out is then opened by both clamps 3 and 4, pulled out for a predetermined length by a chuck member 45 (described later), turned upside down, and then folded back. However, during this time, both the left and right clamps 3 and 4 sink below the top surface of the table 2 by the operation of the cylinder 20 of the lifting device 6, and after the tube 1 is reversed, the left and right clamps 4 are lowered by the operation of the cylinder 20 of the lifting device 6. The cylinder 30 of the longitudinal movement drive device 7 is operated to move the cylinder 30 back to the rear. With this, both the left and right clamps 3 and 4 are placed on the table 2.
are returned to their mutually open state, and preparations for delivering the next portion of the tube 1 are completed.

In FIGS. 1 and 2 showing details of the tube drawer reversing device B, reference numeral 45 is a chuck member, which is provided between a holder 46 that is U-shaped when viewed from the side and the upper and lower walls of the holder 46 so as to be able to rise and fall freely. A press plate 47 is provided. Reference numeral 48 denotes a presser cylinder provided on the upper surface of the upper wall of the holder 46. A piston rod 49 of this cylinder penetrates the upper wall and protrudes downward, and a presser plate 47 is horizontally attached to the tip of the piston rod 49. There is. 50 is a pedestal placed in front of the table 2; 51 is a horizontal rotary rod held on the pedestal 50 so as to be rotatable and movable back and forth, and a chuck member 45 is attached to the rear end of this rod. .
52 is a threaded rod arranged parallel to the rotating rod 51;
Reference numerals 53 and 53 denote a pair of front and rear connecting plates that respectively connect both ends of the rotating shaft 51 and both ends of the threaded rod 52.
Both ends of the threaded rod 52 are held rotatably, but both ends of the threaded rod 52 are fixed. A motor 54 is horizontally attached to the lower end of the front connecting plate 53, and a belt 57 is wound around a drive pulley 55 of the motor and a transmission pulley 56 provided at the front end of the rotating shaft 51. 58 is a rotating shaft 5 on the pedestal 50.
1 and the threaded rod 52, and a motor 59 is attached to the upper wall of the support stand. Reference numeral 60 denotes a female threaded member screwed onto the threaded rod 52, and a belt 63 is wound around a pulley 61 provided integrally with this member and a drive pulley 62 of the motor 59. The female threaded member 60 is rotatably held by the support base 58, and therefore, when the female threaded member 60 is rotated in the forward or reverse direction via the power transmission mechanism due to the operation of the motor 59, this causes the threaded rod 52 to rotate. and rotating rod 5 integrated with this
1 and the chuck member 45 can be moved forward or backward.

The operation of the tube drawer reversing device B will be explained below.

The front end of the tube 1 fed out to the required length by the tube feeding device A is connected to the chuck member 45.
The holding plate 47 is inserted between the open holding plate 47 and the lower wall of the holder 46. Next, presser cylinder 4
8, the holding plate 47 closes and the tube 1
The front end portion of is clamped to the chuck member 45.
In this state, the female threaded member 60 is rotated by the operation of the forward/backward movement motor 59, thereby causing the threaded rod 52, the rotating rod 51 integrated therewith, and the chuck member 45 to move forward, and together with this, the reversing motor 54 operates and the rotating rod 51 moves to 180
The chuck member 45 is rotated once so that the chuck member 45
While holding it, you can flip it upside down. After the tube 1 is pulled out a predetermined length while being reversed in this manner, the chuck member 45 releases the front end of the tube 1 and moves forward for the next bending operation.

Next, in FIGS. 6 to 11 showing the details of the tube bending device C, 70 and 71 sandwich the rear end of the drawer portion 1a of the tube 1, and the drawer portion 1a is counterclockwise viewed from a plane. A pair of rotating clamps that can be folded only in the circumferential direction, 7
2 is a presser clamp arranged near the rear side of the right rotation clamp 71. 73 is an opening/closing device for the right rotation clamp 71 and the presser clamp 72; 74 is a rotation device for rotating the pair of rotation clamps 70, 71 by about 180 degrees; 75 is a rotation device for the three clamps 70, 71, 7.
This is an elevating device that raises and lowers the table 2 so that it protrudes above the upper surface of the table 2 or sinks therefrom.

In the opening/closing device 73, reference numerals 80 and 80 are slide members for opening and closing the rotation clamp 71 on the right side and the presser clamp 72 on the same side, and these slide members 80 and 80 are connected to the guide frames 81 and 8, respectively.
It is housed inside 1 so that it can be slid left and right. The clamp 71 and presser clamp 72 on the right side each have a rectangular plate shape when viewed from the side, and mounting bases 71a and 72a connected horizontally to their lower ends slide through square brackets 82 and 82. It is attached to the left end of the upper surface of the members 80, 80.
The right rotation clamp 71 is arranged opposite to the left rotation clamp 70, and the right presser clamp 72
are arranged in series near the immediate rear side of the right rotation clamp 71 when viewed from above. 83, 83 are presser cylinders, and these cylinders 83, 83 are connected to the guide frame 8 via inverted brackets 85, 85.
1,81 is installed horizontally on the right end of the lower wall. Further, the piston rods 84, 84 of these cylinders 83, 83 are respectively made to protrude toward the right, and their tips are connected to inverted brackets 86, 86 which are attached to the slide members 80, 80 in a hanging manner. are connected to the lower ends of each. The tops 8 of these brackets 86, 86
6a, 86a are accommodated in laterally long openings 87, 87 formed in the lower walls of the guide frames 81, 81. The guide frame 81 of one of the right rotation clamps 71 is a hanging mounting plate 88 whose horizontal section is approximately U-shaped.
and a rotating shaft 9, which will be described later, via a horizontal connecting plate 89.
4. The guide frame 81 of the other presser clamp 72 is connected to the rotating clamp mounting cylinder 102 at the top and is rotatable. 104 is fixed to the horizontal support plate 91 at the upper end, so the presser clamp 72 does not rotate. 92 is presser clamp 7
A first stopper is a bolt screwed horizontally to the right side wall of the guide frame 81 of No. 2, and the tip thereof is adapted to come into contact with the right end surface of the slide member 80. Reference numeral 93 denotes a second bolt made of a bolt screwed horizontally to the hanging mounting plate 90 of the guide frame 81.
This is a stopper, and the tip of this is an inverted bracket 86.
The movement range of the presser clamp 72 is restricted by both stoppers 92 and 93.

In the rotation device 74, 94 is a rotation shaft provided with the left rotation clamp 70 at its upper end. The left rotation clamp 70 has a substantially rectangular plate shape when viewed from the side and a wing shape when viewed from the top, and the rear surface 70a is a curved surface having an arcuate horizontal cross section corresponding to the bending radius of the tube 1. . As shown in FIG. 7, the left side rotating clamp 70 is attached to the top of the rotating shaft 94 by a mounting bolt 76 at its rear edge so as to extend the rotating shaft 94, and therefore, the left side rotating clamp 70 The rotating clamp 70 is configured to rotate in a counterclockwise direction when viewed from a plane about its rear edge. Reference numeral 95 denotes a lower fixed cylinder that holds the lower end of the rotary shaft 94 in a rotatable and movable manner; 96 denotes an internal cylinder interposed between the rotary shaft 94 and the lower fixed cylinder 95; A bearing 97 is provided between the bearing 95 and the bearing 95. 98 is a horizontal bevel gear attached to the upper end of the internal cylinder 96, 99 is a vertical bevel gear meshed with this, and 100 is its pivot, which is connected to the clamp rotation motor 10 via a power transmission mechanism.
1 (see Figure 1). Reference numeral 102 denotes a rotating cylinder attached to a portion near the upper end of the rotating shaft 94, to which the guide frame 81 of the right rotating clamp 71 is coupled via two horizontal connecting plates 89 and a hanging mounting plate 88. .

In the lifting device 75, 103 is the rotating shaft 9
an upper fixed cylinder holding an intermediate portion of height 4, 1
Reference numeral 04 denotes a lifting inner cylinder housed between the rotating shaft 94 and the fixed cylinder 103, 105 a bearing interposed between the rotating shaft 95 and the lower end of the lifting inner cylinder 104, and 106 an lifting inner cylinder. A vertical rack 107 is provided longitudinally on the left side of the cylinder 104, and a pinion is partially fitted into an opening 108 formed on the left side of the upper fixed cylinder 103. It is interlocked. 109
is a pivot of the pinion 107, and both ends of the pinion 107 are rotatably supported by a pair of bearings 110, 110. 111 is another pinion attached to a portion near the front end of the pivot shaft 110, and this pinion is connected to the second horizontal rack 1 disposed on the front side of the rotating shaft 94.
It is interlocked with 12. Reference numeral 113 denotes a second rack that guides the second horizontal rack 112 so as to be movable left and right.
The guide 114 is a horizontally arranged lifting cylinder, and a first horizontal rack 116 is connected to the tip of a left-facing piston rod 115 of this cylinder.
The horizontal rack 116 is guided by a first rack guide 117 so as to be movable left and right. 118 is a pinion engaged with the first horizontal rack 116, and both ends of the pivot shaft 119 of this pinion are connected to a pair of front and rear bearings 120, 12.
It is rotatably supported by 0. 121 is axis 1
a swinging arm attached to the central part of 19, 12;
Reference numeral 2 denotes a connecting plate which is approximately F-shaped when viewed from the front and is connected to the tip of the swinging arm 121 by a pin 123, and the right end of this is connected to a generally U-shaped joint 124 and a pin 125.
It is connected to a connecting rod 126 for swinging the rack. The connecting rod 126 is connected to the second rack guide 1.
13 Through hole 127 drilled in the left end wall 113a
through which it is connected to the end of the second horizontal rack 112.

The operation of the tube bending device C will be explained below.

When the tube 1 is pulled out to a predetermined length and reversed by the tube drawer and reversing device B, the rotating clamps 70 and 71 and the presser clamp 72 are sunk below the table 2 due to the operation of the lifting device 75. That is, as shown in FIGS. 10 and 11, the piston rod 11 of the lifting cylinder 114
5 protrudes, the first horizontal rack 116 moves to the left, and the pinion 118 rotates clockwise when viewed from the front. This allows the swinging arm 121 to move between the connecting plate 122 and the connecting rod 126.
The second horizontal rack 112 is swung to the left via the . Movement of the second horizontal rack 112 causes the pinions 111 and 107 to rotate counterclockwise when viewed from the front, and the lifting inner cylinder 10 includes a vertical rack 106 that engages with the pinion 107
4 is lowered, the three clamps 70, 71,
72 is sunk below the table 2.

When the pulling out and reversing operation of the tube 1 is completed, the piston rod 1 of the lifting cylinder 114 is
15 is retracted and the three clamps 70, 71, 72 are raised together due to the opposite effect to that in the above case.

When these clamps 70, 71, and 72 are raised, the rotating clamp 71 on the right side and the holding clamp 72 are opened with respect to the rotating clamp 70 on the left side by the action of the opening/closing device 73. That is, the sixth
As shown in Figures 9 to 9, the piston rods 84, 84 of the pair of presser cylinders 83, 83 are retracted, the slide members 80, 80 are moved to the right, and the right rotation clamp 71 and presser clamp 72 are each open relative to the rotation clamp 70 on the left side. When these three clamps 70, 71, 72 rise to expose the upper surface of the table 2, the piston rods 84, 84 of the presser cylinders 80, 80 protrude, respectively, and the slide members 80, 80 move to the left, tube 1
A predetermined portion of is clamped by the left rotation clamp 70 and the right rotation cylinder 71, and
The right side surface of the tube portion near the rear side is held down by the right side holding clamp 72.

Next, in this state, the pair of left and right rotating clamps 7
0,71 is 180 in the counterclockwise direction when viewed from the plane
It can be rotated once. That is, when the rotation motor 101 shown in FIG. 1 operates, the vertical bevel gear 99 is rotated via the power transmission mechanism,
As shown in FIGS. 1 and 10, the horizontal bevel gear 98 meshing with the vertical bevel gear 99 is rotated, and as shown in FIG.
6, the rotating shaft 94 rotates, and both clamps 7
0,71 can be rotated 180 degrees while holding the rear end of the drawer portion 1a of the tube 1. At this time, as shown in FIG.
The tube is bent counterclockwise from the right side rear end P as a starting point when viewed from the plane, whereby the tube is bent into a curved shape having a predetermined bending radius along the rear surface 70a of the left clamp 70. It is something. Also at this time, the presser clamp 72
Since the immediate rear side of the bent portion of the tube 1 is pressed from the right side by the bending portion, the tube 1 can be bent quickly and reliably. In addition, since the tube 1 is bent with the rear end portion of the drawer portion 1a held between the left and right rotating clamps 70 and 71, all deformation of the tube 1 due to bending is caused by the rotating clamps 70 and 71. , 71 on the rear side of the tube pull-out portion 1a, and therefore the length of the tube pull-out portion 1a, that is, the length of the straight pipe portion of the meandering tube, may change before and after bending. Moreover, since the tube 1 is bent 180 degrees only in a certain direction, that is, only in the counterclockwise direction when viewed from the plane, the bending angle of the tube 1 is the same in all bending operations, and therefore there is no variation. It is possible to produce a serpentine tube for a heat exchanger that is difficult to form and has precise dimensions.

In FIGS. 12 and 13 showing details of the table auxiliary plate swinging device D, 130 is the table 2
A table auxiliary plate placed in the notch 9 at the center of the front so as to be at the same level as the table 2, 131 is a rectangular auxiliary plate mounting frame fixed to the bottom surface of the table 2 when viewed from the side, 132, 132 are table auxiliaries A pair of mounting arms fixed to the lower right side of the plate 130 and shaped as seen from the front, these arms 13
The tip of 2,132 is connected to bracket 133 and pin 1.
34 to the lower surface of the upper wall of the auxiliary plate mounting frame 131, the table auxiliary plate 130 is made swingable. Reference numeral 135 denotes a cylinder for swinging the auxiliary plate, which is horizontally attached to the right end of the rack guide 137, and its piston rod 136 projects leftward. A rack 138 is horizontally attached to the tip of the piston rod 136, and is guided by a rack guide 137. A pinion 139 is engaged with the rack 138, and both ends of a pivot shaft 140 are rotatably supported by a pair of bearings 141, 141. 142 is a swing arm attached to the pivot 140, and 143 is a pin 1 at the tip thereof.
44 is a connecting link that is rotatably attached and has a substantially doglegged shape when viewed from the side.The tip of this link 143 is connected to a portion near the right end of the table auxiliary plate 130 by a bracket 145 and a pin 146.

The operation of the table auxiliary plate swinging device D will be explained below.

When the front end of the bent tube 1 is supported by the table auxiliary plate 130, the piston rod 136 of the auxiliary plate swinging cylinder 135 is retracted, as shown in FIG. The plate 130 is in the raised position and is arranged horizontally at the same level as the table 2. When the chuck member 45 of the tube drawer reversing device B comes to grasp the front end of the tube 1, the cylinder 1
35 piston rod 136 protrudes, causing rack 138 to move from right to left, and rack 1
Pinion 139 and pivot 140 meshing with 38
rotates, and the swinging arm 142 coaxial with the pinion 139 swings from left to right, thereby pulling the connecting link 143 to the right, thereby causing the table auxiliary plate 130 to swing. , as shown by the two-dot chain line in the same figure, is vertically sunk below the table 2.

Next, the cutting process of the meandering tube by the manufacturing apparatus Y for meandering tubes for heat exchangers will be explained based on FIG. 14.

First, a flat regular-length tube 1 is placed vertically on the table 2 with one side edge down and the other side up, and the front end of the tube is placed on the tube bending device C. It is held between a pair of left and right rotating clamps 70 and 71. and rotating device 74
Due to the action of, both clamps 70 and 71 are rotated 180 degrees counterclockwise when viewed from the plane.
The tube 1 is bent in a folded manner starting from the right side rear end P of the left rotation clamp 70 and along the curved surface of the rear surface 70a of the left rotation clamp 70. At this time, the immediate rear side of the bent portion of the tube 1 is pressed down from the right side by the holding clamp 72. Further, the clamping clamps 3 and 4 of the tube clamping and feeding device A protrude upward from the table 2 by the action of the lifting device 6, and move rearward during bending of the tube 1 (FIG. 14A).

After the tube 1 is bent for the first time, the intermediate portion of the tube 1 is clamped by the pair of clamp feed clamps 3 and 4 due to the action of the opening/closing device 5. At this time, the rotating clamps 70, 71 and the holding clamp 72 of the tube bending device C are separated from the tube 1 to facilitate the movement of the tube 1 (FIG. 2B).

In this state, the pair of clamp feed clamps 3 and 4 are moved forward a predetermined distance by the action of the forward and backward movement device 7, and the tube 1 is fed out a required length. After the tube 1 is sent out, the chuck member 45 is moved by the longitudinal movement motor 59 of the tube drawer reversing device B.
moves backward and pinches the bent front end of the tube 1 from both the upper and lower sides. When the chuck member 45 is retracted, the table auxiliary plate 130 is sunk below the top surface of the table 2 (FIG. 3C).

Next, the chuck member 45 moves forward a predetermined distance while holding the front end of the tube 1 and rotates upside down, whereby the tube 1 is pulled out a predetermined length and turned over.
During this reversal of the drawer 1, a pair of pinch feeding clamps 3, 4 and rotating clamps 70, 7
1 and the presser clamp 72 wait below the table 2, and the rotary clamps 70 and 71 are reversed and returned to their original states. After the tube 1 is pulled out and reversed, the chuck member 45 releases the bent front end of the tube 1, and the table auxiliary plate 130 is held at the same level as the table 2 by the action of the table auxiliary plate swinging device D, and the tube 1 is folded. The bent front end is thereby supported from below (FIG. 2D).

Next, by the action of the tube bending device C, the drawn-out portion 1a of the tube 1 is folded back in the counterclockwise direction when viewed from the plane, as in the case shown in FIG.

After the second bending of the tube 1, the middle portion of the tube 1 is held by a pair of clamp feed clamps 3 and 4 and fed out to a required length. moves backward, and the bent front end of the tube 1 is clamped from both the upper and lower sides (FIG. 1).

Next, as the chuck member 45 rotates while moving forward, the tube 1 is pulled out a predetermined length and reversed as in the case described above (FIG. 3).

Furthermore, by the action of the pair of rotary clamps 70, 71 and the holding clamp 72 of the tube bending device C, the tube is bent counterclockwise when viewed from the plane as in the case described above (FIG. 1).

Thereafter, this operation is automatically repeated to produce a serpentine tube for a heat exchanger.

In addition, in the above embodiment, the case where the present invention is applied to the flat tube 1 is shown, but the present invention is of course applicable to the case where a meandering tube is manufactured from a tube having other shapes such as a circular cross section. .

Effects of the Invention As described above, the serpentine tube manufacturing device for a heat exchanger according to the present invention clamps the regular length tube 1 placed on the table 2 from both the left and right sides by a pair of tube clamps 3 and 4. Tube clamp feeding device A that sends this forward to the required length
Then, grasp the front end of the tube 1 fed out by the tube pinching feed device A and move the tube 1.
a tube drawer reversing device B having a chuck member 45 that is freely movable back and forth and rotatable for pulling out a predetermined length and reversing the tube so that it is upside down;
A pair of left and right rotating clamps 7 that clamp the rear end of the drawer portion 1a of the tube 1 after the drawer is reversed and bend the drawer portion 1a in a folded shape only in a certain direction.
0, 71 and a tube bending device C having a presser clamp 72 that presses the tube 1 from the side opposite to the folding side, and the rear end of the drawer portion 1a of the tube 1 has a left and right rotation clamp. Since the tube 1 is bent while being held between the tubes 70 and 71, all the deformation of the tube 1 due to bending occurs on the rear side of the tube drawer portion 1a.
The length a, that is, the length of the straight pipe part of the meandering tube does not change before and after bending,
Further, since the tube 1 can be bent only in a certain direction, for example, in a counterclockwise direction when viewed from the plane, by 180 degrees, the bending angle of the tube 1 is the same in all bending operations, and variations are unlikely to occur. Therefore, it is possible to efficiently and automatically manufacture a meandering tube for a heat exchanger with high dimensional accuracy and having a desired rectangular profile when viewed from the front.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a schematic left side view of the meandering tube manufacturing device, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged plan view of the tube pinching and feeding device. Figure 4 is a left side view of the same, Figure 5 is a front view of the same, Figure 6 is an enlarged plan view showing the upper part of the tube bending device, Figure 7 is an enlarged sectional view taken along the line of Figure 6, and Figure 8 is a Figure 6 is an enlarged sectional view taken along the line, Figure 9 is an enlarged sectional view taken along the line Figure 6, Figure 10 is an enlarged horizontal sectional view showing the lower part of the tube bending device, and Figure 11 is the view 10. Fig. 12 is an enlarged sectional view taken along the line XI--XI, Fig. 12 is an enlarged sectional view showing the table auxiliary plate swinging device, Fig. 13 is an enlarged sectional view taken along the line It is an explanatory diagram showing the order of steps. 15th
The figures are a schematic overall plan view of an automatic tube cutting device to a fixed length and a meandering tube manufacturing device for a heat exchanger, FIG. 16 is a left side view of the same, and FIG. 17 is a right side view of the same. X...Tube automatic length cutting device, Y...Meandering tube manufacturing device for heat exchanger, 1...Tube, 2...
Table, A...tube feeding device, 3, 4...
Tube clamp feeding clamp, 5...opening/closing device, 6...
Lifting device, 7... Back and forth movement device, 8, 9... Notch, B
...Tube drawer reversing device, 45... Chuck member, 48... Presser cylinder, 54... Reversing motor, 59... Back and forth movement motor, C... Tube bending device, 70... Left side rotating clamp, 71... Right side rotating clamp, 72... Right side presser clamp, 73... Opening/closing device, 74... Rotating device, 75... Lifting device, 94...
Rotating shaft, 101...Motor for rotating clamp, 114
... Cylinder for lifting and lowering the clamp, D... Table auxiliary plate swinging device, 130... Table auxiliary plate, 135... Cylinder for swinging the auxiliary plate.

Claims (1)

[Claims] 1 A tube clamping and feeding device A that clamps a fixed length tube 1 placed on a table 2 from both left and right sides by a pair of tube clamping clamps 3 and 4 and feeds it forward a required length; A tube drawer reversal having a chuck member 45 that is freely movable back and forth and rotatable to grasp the front end of the tube 1 fed out by the feeding device A, pull out the tube 1 by a predetermined length, and invert it so that it is upside down. Device B, a pair of left and right rotating clamps 70 and 71 that clamp the rear end of the drawer portion 1a of the tube 1 after the drawer is reversed and bend the drawer portion 1a in a folded shape only in a certain direction, and the folded side is opposite to the device B. A manufacturing device for a meandering tube for a heat exchanger, comprising a tube bending device C having a presser clamp 72 that presses the tube 1 from the side.