JPH0157963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a petal-shaped finned tube used in a heat exchanger, etc., and an apparatus for manufacturing the same.

As shown in FIGS. 1 and 2, the conventional method for manufacturing a petal-shaped finned tube is to corrugate a fin material 1 with a pair of spur gear devices 2, and then create a tunnel with a braking device 4 attached to the exit. The inner tube 5 is pushed in from the entrance of the guide 3 to reduce the pitch, and then pulled out one after another from the exit of the tunnel guide 3, and the inner tube 5 is wrapped with solder tape 6 in advance.
The inner tube 5 is manufactured by winding the fin material in a spiral manner around the outer circumference of the inner tube 5, then heating the molded fin-wrapping cylinder and soldering the wrapped fin material to the inner tube 5.

In this manufacturing method, the corrugated fin material with a reduced pitch is pulled out from the exit of the tunnel guide 3 and wrapped around the outer circumference of the inner tube. The tension applied to the fin material is such that the pitch does not recover; in other words, it is necessary to wrap the corrugated fin material around the inner tube 5 under very low tension, and the winding speed is improved due to the constraints of low tension. I couldn't do it.

In addition, since the speed of the corrugated fin material pulled out from the exit of the tunnel guide 3 is slow, the speed of forming and pushing the fin material by the spur gear device 2 is inevitably limited and slow, resulting in very low productivity as a whole. However, petal-shaped finned tubes had the drawback of being expensive.

This invention was made with the aim of eliminating these problems of the prior art, and its gist is that a rotary mold cylinder with a plurality of pins implanted in an annular shape on the side end surface is arranged around a smooth tube. At the same time, a push-type rotary cylinder equipped with a device for pushing between two pins in the axial direction is mounted on a movable carriage through a housing concentrically with the mold rotary cylinder, and is wound around the pins. The fin material is formed into a wavy shape on the outer periphery of the smooth tube, and the intermittent rotation of the pressed rotary tube and the mold rotary tube and the smooth tube, and the axis of the smooth tube of the cart on which the pressed rotary tube and the mold rotary tube are installed. This method attempts to efficiently manufacture petal-shaped finned tubes by winding a forming material around a smooth tube that has been soldered in advance, and then heating and soldering the tube by relative intermittent movement in the direction. .

Hereinafter, the embodiment will be explained based on the drawings. In FIGS. 3, 4, and 5, 11 is a push die rotary tube, 12 is a die rotary tube, and 13 is these rotary tubes 11, 12. A housing that rotatably supports the

The push type rotary cylinder 11 has a bearing 1 in the housing 13.
4, and is rotatably fitted through the mold rotary cylinder 12.
is fitted onto one end of a hollow shaft 16 which is rotatably fitted in the press-type rotary cylinder 11 via a bearing 15, and is a drive transmitted via a transmission wheel 17 mounted on the other end of the hollow shaft 16. It rotates integrally with the hollow shaft 16 due to force.

Push molds 18a and 18b are attached to the tip end of the side end surface of the rotary press cylinder 11, and a support plate 20 is attached.
cylinder 19a supported via a, 20b;
19b and a press mold guide groove 21 in which the press molds 18a and 18b are individually fitted and guided are provided at a predetermined angle (30° in the embodiment). 22 is a tension spring connected between the support plate 20a and the stand 23 fixed to the housing 13;
is a positioning stopper for the press-type rotary cylinder 11.

On the side end surface of the mold rotating cylinder 12, press mold guide grooves 25 are cut at equal pitches around the entire circumference (12 equal parts in the embodiment) and tapered at the entrance. In between, a pin 26 is implanted in an annular shape closer to the center of rotation than the end of the guide groove to receive the fin material 1 that is pressed and bent by the press dies 18a and 18b. Further, the press molds 18a and 18b have guide pieces 18 guided by the press mold guide grooves 21 and 25.
a' and 18b' are formed.

In FIG. 6, 27 is a No. 1 air cylinder for rotating the mold rotating cylinder 12, and a rack and pinion mechanism 28 connected to the piston rod of the air cylinder 27 transmits power to one clutch 29, a worm reducer 30, and a belt. It is connected to the transmission wheel 17 through the body 31, and has a structure in which the mold rotating cylinder 12 provided in the housing 13 is intermittently rotated by a predetermined angle (30 degrees in the embodiment) by the stroke operation of the air cylinder 27. ing.

These intermittent rotation driving devices for the rotary cylinder 12 are installed on a movable cart 32 that is intermittently moved linearly by a driving device to be described later.

The movable cart 32 is further provided with a fin material delivery reel 33, which delivers the fin material F to be unwound onto the pin 26. Further, a solder melting heating device 52 for soldering the formed fin material wound around the smooth tube P is installed on the movable cart 32. As the heating device 52, any heating device such as a dryer, a torch lamp, a gas burner, an infrared ray heating device, a high frequency heating device, etc. may be used.

One end of the smooth tube P inserted through the mold rotating cylinder 12 and the hollow shaft 16 is rotatably supported by a support device 34, as shown in FIGS. 6 and 7, and the other end of the smooth tube P is supported by a chuck 35. The chuck 35 is connected to a No. 2 air cylinder 39 for pipe rotation via a worm reducer 36, a clutch 37, a rack and pinion mechanism 38, etc., and the stroke operation of the No. 2 air cylinder 39 The smooth tube P is intermittently rotated by a predetermined angle (30° in the example).

As shown in FIGS. 7 and 8, the movable trolley 32 is movably supported on a track surface 40 on a base via wheels 41, and has a screwdriver screwed into a nut 42 attached to the lower surface of the trolley. It moves by rotation of the rod 43. 44 is a No. 3 air cylinder (see Fig. 6) for driving the screw rod; a rack and pinion mechanism 45 connected to the piston rod of the air cylinder 44; on the other hand, a clutch 46, a speed reducer 47, and an electromagnetic clutch 48a. and is linked to one end of the screw rod 43.

The other end of the screw rod 43 is rotatably supported by a support bearing 49, and an electromagnetic clutch 48 is attached to the end thereof.
It is linked to the electric motor 50 via b. The electromagnetic clutches 48a and 48b are interlocked so that when one is engaged, the other is disengaged, and when the electromagnetic clutch 48a is engaged,
Due to the stroke operation of the No. 3 air cylinder 44, the movable cart 32 moves the W/N amount (however,
W is the width of the fin material, N is the number of pins 26 implanted on the side end surface of the mold rotating cylinder...In the example, it moves intermittently by 12), and finally reaches the position of the imaginary line shown in Fig. 7. Moving. In this state, when the electromagnetic clutch 48b is turned on and the electric motor 50 is driven, the movable carriage 32 continuously returns to its original position. Note that 51 is a solenoid valve connected to each of the air cylinders.

Since the present invention is configured as described above, in order to manufacture a petal-shaped finned tube, first, the hollow shaft 16
The smooth tube P is passed through the pipe P, one end of which is gripped by a chuck 35, the other end is supported by a support device 34, and cream-like solder is appropriately applied to the outer surface of the smooth tube P by well-known means. Next, as shown in FIG.
The unwound fin material F is wound around the pin 26 of the mold rotating cylinder 12, and its tip is clamped to the smooth tube P. In this state, the electromagnetic valve 51 is activated by operating an operation panel (not shown), and the air cylinders 19b, 19a, 27, 39, and 44 are activated in the following order.

First, by moving the air cylinder 19b downward, the fin material F on the pin 26 is pressed and bent toward the smooth tube P by the tip of the pressing die 18b, forming it into a U-shape.
Subsequently, the press die 18 is pressed by the air cylinder 19a.
A is moved downward to form the fin material F into a wave shape in the same manner as described above.

When this operation is finished, the No. 1 air cylinder 27 and the No. 2 air cylinder 39 operate simultaneously with the press molds 18b and 18a being pushed between the pins 26, and the press mold rotary cylinder 11 and the mold The rotating cylinder 12 is separated by the stroke of the air cylinder 27, that is,
At the same time, the smooth tube P is rotated by the stroke of the air cylinder 39. Due to the stroke operation of the air cylinder 27, the push mold rotary cylinder 11 and the mold rotary cylinder 12 are simultaneously rotated by a predetermined angle, and then the air cylinders 19b and 19a are simultaneously moved upward, and both the press molds 18b and 18a are moved toward the pin 26.
It is pulled out from the gap and the guide groove 25.

For this reason, the push-type rotary cylinder 11 is reversed by receiving the tensile force of the tension spring 22 (FIG. 4), and the push-type rotary cylinder 11 is rotated in the opposite direction.
Air cylinders 19b, 19 attached to 1
a quickly returns to its original position, that is, the support plate 20a
returns to the position where it hits the positioning stopper 24 as shown in FIG. At this return position, when the air cylinder 19b is actuated by the same operation as described above, the press die 18b is pushed into the U-shaped part formed by the press die 18a in the previous step.
Holds the fin material. When the air cylinder 19a is subsequently operated, the unformed fin material F
is pressed down and molded by a pressing die 18a,
Thereafter, the above operation is repeated.

On the other hand, the moving truck 32 is operated by the air cylinder 4 which is operated simultaneously with the No. 1 air cylinders 27 and 39.
4 (Fig. 6), it is moved to the right in the figure by the W/N amount.

Thereafter, by the same operating procedure, the forming of the fins and the winding around the tube are successively carried out with high efficiency without any fluctuation in the pitch of the forming fins.

During this operation procedure, even if there is a slight angular shift between the phases of the rotary press cylinder 11 and the rotary mold cylinder 12, the guide piece 1 is guided by the press mold guide grooves 21 and 25.
Centering action by 8a' and 18b' and transmission wheel 1
7, and the displacement absorbing action of the transmission body 31 such as a belt. The formed fin material wrapped around the outer circumference of the tube is heated by the heating device 52 during the fin forming and wrapping operations, and is soldered.

In addition, in the above operation procedure, the solder for adhering the molded fin material to the smooth tube in a petal shape may be applied before the smooth tube is set or during operation, or it may be applied in the form of a tape prepared separately. You may also wrap solder around it. In the illustrated embodiment, the solder applicator 5
3 is provided (see Fig. 3).

Furthermore, although not described, the cooling means for solidifying the molten solder can achieve its purpose by air cooling without any special cooling means; It can accelerate the coagulation rate.

The above explanation is based on the number of pins installed in the mold rotating cylinder 12.
Although the explanation has been given on the case where 12 pieces of waveform can be formed in one roll of the smooth tube, the present invention is not limited to this, and the number can be increased or decreased as appropriate depending on the diameter of the smooth tube. good.

Furthermore, in the embodiment described above, the smooth tube is rotated and held in a fixed position, and the waveform shaping device is moved intermittently in the longitudinal direction of the smooth tube. It may also be rotated or moved.

As described above, the present invention wraps the fin material formed into a wave shape around the smooth tube while rotating the wave shaping device and the smooth tube intermittently, and also moves the wave shaping device intermittently in the axial direction of the smooth tube. This made it possible to automatically manufacture petal-shaped finned tubes. As a result, compared to a conventional friction braking device, there is no variation in the pitch of the waveform, and there is no tension constraint when wrapping the formed fin material around the smooth tube. The manufacturing cost of shaped finned tubes can be drastically reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional device. FIG. 2 is a side sectional view of the main part of the conventional device. FIG. 3 is a side sectional view of the rotating cylinder. FIG. 4 is a front view of FIG. 3. FIG. 5 is a plan view of FIG. 4. FIG. 6 is a plan view of the manufacturing apparatus according to the present invention. FIG. 7 is a side view of FIG. 6. Figure 8 is from Figure 7.
View. In the figure; 11... push-type rotary cylinder, 12...
Mold rotating cylinder, 13... Housing, 14, 15...
Bearing, 16...Hollow shaft, 17...Transmission wheel, 18
a, 18b...Press die, 18a', 18b'...Guide piece, 19a, 19b, 27, 39, 44...Air cylinder, 20a, 20b...Support plate, 21, 25...Guide groove, 22... ...Tension spring, 23...Stand, 24...Positioning stopper, 26...Pin, 28, 38, 45...Rack and pinion mechanism, 29, 37, 46...One clutch, 30, 36, 47...Deceleration Machine, 31... Transmission body, 32... Moving trolley, 33... Reel, 34...
...Smooth tube support device, 35...Chuck, 40...
Raceway surface, 41...Wheel, 42...Nut, 43...
... Screw rod, 48a, 48b ... Electromagnetic clutch, 49 ... Support bearing, 50 ... Electric motor, 5
1... Solenoid valve, 52... Heating device, 53...
Automatic solder coating equipment.

Claims (1)

[Claims] 1. A waveform forming device consisting of a rotary mold cylinder having a plurality of pins annularly implanted on the side end surface and a rotary press mold cylinder having at least two press molds on its outer periphery, The fin material arranged around the pipe and wound around the pin is formed into a wave shape by pressing with a pressing die,
Next, the formed fin material is wound around the smooth tube by intermittent rotation of both rotating tubes and the smooth tube, and relative intermittent movement of the wave forming device in the axial direction of the smooth tube, and then heated and soldered to form petals. A method for manufacturing a petal-shaped finned tube, characterized by manufacturing a petal-shaped finned tube. 2. A mold rotary cylinder in which a plurality of pins are implanted in a ring shape on the side end surface and guide grooves are cut in the radial direction;
A waveform consisting of a push mold rotary cylinder provided on the outer periphery of the mold rotary cylinder and having at least two press molds each having a guide piece that engages and disengages from a guide groove of the mold rotary cylinder, and a press mold rotary cylinder return device. A forming device is disposed around the smooth tube, and a device for individually driving the pressing molds, a driving device for intermittently rotating the mold rotating cylinder while the guide pieces are engaged with the guide grooves, and a device for driving the mold rotating cylinder intermittently while the guide pieces are engaged with the guide grooves are provided. A drive device that rotates intermittently, a drive device that moves the waveform shaping device and the smooth tube relatively intermittently, and a control device that operates these drive devices in a fixed order.
A petal-shaped finned tube characterized by comprising a device for supplying a fin material onto an annular pin attached to a mold rotating cylinder, and a device for heating the forming fin material wrapped around the outer periphery of the smooth tube. Manufacturing equipment.