JPS5825526B2 - Continuous manufacturing method for heat exchange tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously manufacturing heat exchange tubes.

Conventional heat exchange tube manufacturing methods require 150 to 300 pipes.
Cut the pipe into a length of about 1.5 ft (m) long, rotate it forward, wrap a fin around it, stop when the rear end of the pipe is reached, manually weld the next pipe, mark that part, and restart. A known method is to continue the winding operation.

In this case, the tubes are cut to the product size regardless of the connection portion, and from among the many completed heat exchange tubes, those having the welded portions with the above marks are visually selected and removed.

However, in order to minimize the number of heat exchange pipes that contain unusable welded parts and eliminate waste, it is necessary to use very long pipes of about 150 to 300 m, and it is difficult to store the pipes. The disadvantage is that it requires a huge amount of space.

On the other hand, if short pipes are used, a large number of heat exchange tubes including unusable welded parts are formed, resulting in a large amount of waste.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing heat exchange tubes that eliminates the above-mentioned conventional drawbacks and allows continuous and automated manufacture of heat exchange tubes of a fixed length, which is the product size.

Another object of the present invention is to provide a method for manufacturing heat exchange tubes that can continuously manufacture heat exchange tubes in which a short portion including a connecting portion for connecting chopsticks and tubes is automatically removed. be.

That is, in the present invention, the distance from the predetermined position where the detection device for detecting the leading end of the heat exchange tube is installed to the reference position where the cutter that cuts the heat exchange tube starts traveling becomes the product dimension of the heat exchange tube. and from when the detection device detects the leading end of the heat exchange tube, the cutter is caused to travel in the feeding direction of the heat exchange tube at the same speed as the feed speed of the heat exchange tube, and is advanced toward the heat exchange tube. The heat exchange tube is cut by cutting the heat exchange tube.

Further, the present invention detects and stores the position of the rear end of the leading pipe before connecting the rear end of the leading pipe and the distal end of the trailing pipe, and then connects the rear end of the leading pipe and the leading end of the trailing pipe. Connect the tip of the tube, send out the connected long tube, wrap a fin around it to form a heat exchange tube, and connect the above to the reference position where the cutter for cutting the heat exchange tube is located. When the part immediately after the section is reached, the cutter starts running in the axial direction of the heat exchange tube at the same speed as the feed speed of the heat exchange tube, and moves toward the heat exchange tube to connect the heat exchange tube. It is characterized by cutting immediately after the section.

The present invention will be specifically described below based on embodiments shown in the drawings.

1 is a tube stock location where tubes 2 having a length slightly longer than an integral multiple of the product size 1 of the heat exchange tubes are arranged and stored.

Reference numeral 3 denotes a delivery device that sequentially sends out the tubes 2 stored in the tube stocking location 1 one by one in the axial direction.

Reference numeral 4 denotes a connecting device for connecting the rear end of the leading pipe 2a and the tip of the trailing pipe 2b sent out by the sending device 3, and is composed of, for example, a ring welding machine.

Reference numeral 5 denotes a detection device for detecting the rear end of the leading pipe before connection by the connection device 4, and is installed at a predetermined position between the connection device 4 and the delivery device 3.

As this detection device, a mechanical switch, an optical switch, a magnetic switch, etc. can be applied.

Reference numeral 6 denotes a rotating/dispensing device that rotates and sends out the long tube connected by the above-mentioned connecting device at a constant speed, and for example, a head equipped with a feeding roller that pinches and feeds the tube is rotatably supported and driven. A spur gear attached to the head meshes with a spur gear connected to the output shaft of the motor, and a bevel gear connected to the feed roller meshes with a bevel gear connected to the output shaft of the drive motor.

A rotary encoder that outputs a pulse signal according to the amount of tube feed, and a tacho generator that detects the tube feed rate are installed in this rotary feed device 6, connected to the output shaft of the drive motor.

Reference numeral 7 denotes a fin wrapping device that wraps the radiation fins 9 delivered from the radiation fin storage reel 8 around the tube delivered while being rotated by the rotation delivery device 6.

10 is a heat exchange tube 1 formed by the fin wrapping device 7
A cutter 10a formed to be able to advance toward 1a
A traveling cutter is installed at the tip of the heat exchange tube 11a.
It is slidably supported along a guide 12 arranged parallel to the axis of the motor, and is configured to run at a constant speed by, for example, a feed screw mechanism connected to a drive motor.

Furthermore, in order to make the running speed of the cutter 10a the same as the delivery speed of the heat exchange tube 11a, the traveling cutting machine 10 has a speed control of the delivery speed of the heat exchange tube 11a detected from a tacho generator installed in the rotary delivery device 6. A device is provided which receives the synchronization signal 18 and controls the rotational speed of the drive motor so that the signal 18 and the signal of the running speed of the cutter issued from the tachogenerator connected to the feed screw are the same.

Also, when the traveling cutting machine 10 returns to the right in the figure, a limit switch 13 installed at the right end reference position of the guide 12
The cutter 10a is configured to come into contact with the cutter 10a, and the returning movement is stopped in response to a signal from the limit switch 13, thereby stopping the cutter 10a at the reference position.

Further, in the traveling cutting machine 10, the cutter 10a is a heat exchange tube 11a.
After traveling a predetermined distance toward the heat exchange tube 11a and cutting the heat exchange tube 11a, the travel return signal is automatically issued when the travel return signal is returned and the return travel is started in the right direction in the figure.

Reference numeral 14 denotes a detection device for detecting the leading end of the heat exchange tube 11a, and is installed at a predetermined position 1 product dimension away from the reference position where the cutter 10a of the traveling cutter 10 starts traveling.

As this detection device 14, for example, a mechanical switch,
Optical switches, magnetic switches, etc. can be applied.

15 is a preset counter, and the distance from the predetermined position where the position detection device 5 is installed to the reference position where the cutter 10a starts traveling, and the distance Δl from the connection part 16 to the point immediately after the connection part 16 is cut. This is to set the total number of pulses transmitted from the rotary encoder of the rotary output device 6 when the added distance heat exchange tube 11a is sent.

That is, when the rear end of the leading pipe 2a is detected by the detection device 5, the total number of pulses corresponding to the added distance is set in the preset counter 15.

Note that when the detection device 5 detects the tip of the trailing tube 2b, the signal output from the detection device 5 is configured not to operate the preset counter 15.

With the above configuration, among the tubes 2 stored in the tube stock location 1, one leading tube 2a is first delivered by the delivery device 3, and then delivered while being rotated by the rotating delivery device 6. The radiating fins 9 are wrapped by the fin wrapping device 7 to form a heat exchange tube 11a.

When the leading end of the heat exchange tube 11a reaches the position where the product size detection device 13 is installed and the detection device 13 is activated, a signal 17 output from the detection device 13 is input to the traveling cutting machine 10. The cutter 10a of the traveling cutter 10 starts traveling along the guide 12 at the same speed as the feed speed of the heat exchange tube 11a based on the synchronization signal 18 obtained from the tacho generator of the rotary feed device 6, and It advances toward the exchanger tube 11a, bites into the heat exchange tube 11a, and cuts the heat exchange tube 11a.

Thereafter, the cutter 10a retreats away from the heat exchange tube 11a, and when the return is completed, the traveling cutter 10 returns to running rightward in the figure, and the limit switch 13 is activated to stop the cutter 10a at the reference position.

By repeating this operation, the product size l
A large number of heat exchange tubes 11b having a length of 1 are completed.

Next, when the rear end of the leading pipe 2a reaches the position where the pipe rear end detection device 5 is installed, and the detection device 5 is activated and the pipe rear end signal 19 is output, the preset counter 15 displays the detection device. At the same time that the total number of pulses corresponding to the distance from the position where the cutter 5 is installed to the reference position of the cutter 10a plus the distance Δ1 from the connection part 16 to the immediately afterward is set, the rotation output device 6 stops rotating. A command 20 is applied to stop the rotation and delivery of the leading pipe 2a so that the rear end of the leading pipe 2a stops at the center position of the connecting device 4.

Next, the trailing tube 2b is advanced by the delivery device 3, and both tubes 2a are
, 2b are brought into close contact with each other and welded and connected by a connecting device 4, that is, a welding machine.

Thereafter, the delivery device 3 is opened, and the long tube is sent out while being rotated by the rotary delivery device 6, and the radiation fins 9 are wrapped around the tube by the fin wrapping device 7.

As the winding progresses, the tube connection also moves forward.

At this time, a pulse signal output from the rotary encoder of the rotary feed device 6 in accordance with the amount of tube feed is applied to the preset counter 15, and the preset counter 15 sequentially subtracts from the preset value.

When this subtraction result becomes zero, preset counter 1
5 applies a traveling cutting start command signal 21 to the traveling cutting machine 10, and the cutter 10a of the traveling cutting machine 10 starts traveling from the reference position along the guide 12 at the same speed as the feed speed of the heat exchange tube 11a. Proceeding toward the heat exchange tube 11a,
The heat exchange tube 11a is cut immediately after the connecting portion 16.

Next, the cutter 10a is moved back in a direction away from the heat exchange tube 11a, and then returned to the reference position and stopped.

In this way, the tip of the connection part 16 of the heat exchange tube is cut by the command signal 17 from the product size detection device 14, and the rear end of the connection part 16 of the heat exchange tube is cut by the command signal 19 from the pipe rear end detection device 5. The preset counter 15 is preset and disconnection is performed by a command output when the content of the preset counter 15 becomes zero.

By repeating such operations, the connecting portion 16 is cut into short pieces and removed, and the heat exchange tube 11b having the product size l is continuously and automatically produced.

In the above embodiment, the case where one traveling type cutting machine 10 is installed is explained, however, another traveling type cutting machine having the same configuration as the aforementioned traveling type cutting machine 10 is installed in the right direction of the traveling type cutting machine 10 as shown in the figure. When the rear end of the connecting portion 16 is cut, the cutter 10a of the traveling cutting machine 10 is not returned to the reference position. Then, the rear end of the connection part can be immediately cut off using a cutter of a traveling cutter provided separately.

Also, when cutting the rear end of the connection part 16, the traveling cutting machine 10
In order to cut without returning the cutter 10a to the reference position, the traveling cutting machine is equipped with a rotary encoder that detects the traveling distance of the traveling cutting machine 10, and the traveling cutting machine is set to the value preset in the preset counter 15. This is carried out by adding the traveling distance of , using the signal from the rotary encoder, and when the added value matches the value output from the rotary encoder of the rotary output device 6, the traveling cutting machine 10 starts traveling. be able to.

As explained above, according to the present invention, the connected tubes are sent out, the heat exchange tubes with the heat radiation fins wrapped around the tubes are cut at predetermined positions, and the product dimensions are determined. It is possible to continuously manufacture heat exchange tubes having the following properties, and the operating rate can be significantly improved.

Furthermore, according to the present invention, it is possible to cut and remove a small portion of the connection part of the pipe that cannot be used in the product, so even if the material pipe is shortened and the connection frequency is increased, waste can be reduced. Moreover, the space occupied by the apparatus can be reduced by making the material tube shorter.

Further, according to the present invention, there is no need to search and detect the connection portion after the fins are wrapped, so that the present invention can be applied to any heat exchange tube in which any heat dissipation fins are wrapped around the tube.

[Brief explanation of the drawing]

The figure is a schematic diagram showing an embodiment of a continuous manufacturing apparatus for heat exchange tubes according to the present invention. 1: Pipe stock location, 2: Pipe, 2a: Leading pipe, 2b = Trailing pipe, 3: Delivery device, 4: Connection device, 5: Detection device, 6
: Rotary delivery device, 7: Fin winding device, 9: Radiation fin, 10: Traveling cutting machine, 10a: Cutter, 11a, 11
b Two heat exchange tubes, 12: Guide, 13: Limit switch,
14: Detection device, 15 nib reset counter.

Claims (1)

[Claims] 1. A preparation step of preparing a large number of tubes having lengths slightly longer than an integral multiple of the product dimensions, and a rear end of the leading tube and a tip of the trailing tube prepared by the preparation step. a connecting step of connecting the tubes so as to be integrated; a step of sending out the long tube formed by the connecting step in the axial direction and wrapping a fin around it to form a heat exchange tube; When the leading end of the heat exchange tube reaches a predetermined position, a cutter for cutting the heat exchange tube is heated in a direction approximately parallel to the axis of the heat exchange tube from a reference position separated by the product dimension from the predetermined position. A method for continuously manufacturing a heat exchange tube, comprising the steps of running the tube at the same speed as the delivery speed of the tube, and cutting the heat exchange tube into product dimensions by biting the tube. 2. A preparation step of preparing a large number of tubes having lengths slightly longer than an integral multiple of the product dimensions, and connecting the rear end of the leading tube and the tip of the trailing tube prepared by the preparation step so as to be integrated. a step of sending out the tube formed by the connecting step in the axial direction and wrapping a fill around it to form a heat exchange tube; and a portion immediately after the connecting portion connected by the above connecting step. When the cutter reaches the reference position where the cutter for cutting the heat exchange tube is located, the cutter starts running in a direction almost parallel to the axis of the heat exchange tube at the same speed as the delivery speed of the heat exchange tube, and at the same time 1. A method for continuously manufacturing a heat exchange tube, comprising the steps of inserting the heat exchange tube into the tube and cutting the heat exchange tube immediately after the connection part.