JPH0241726A - Manufacturing device for pipe with fin on outer surface - Google Patents

Abstract

PURPOSE:To improve productive efficiency by providing a sensor to detect each position of a pipe to be worked to move it in a lengthwise direction and controlling the start, stop and working speed of a working roll through a controlling means. CONSTITUTION:A fin is worked by a working roll 5, the pipe 1 to be worked is arranged so that it is sent in a lengthwise direction, several screw rods 11 are arranged in parallel along the moving locus. A non-contact sensor 13 and a motor 12 are provided on each screw rod 11. Further, a controller 14 provides a CPU, controls the rotation of a working roller 5 and the sensor 13 detects each position of the pipe 1 to be worked to input a signal into the controller 14. Thus, the controller 14 controls the start, stop and working speed of the pipe 1 at each set point according to the signals of an input device 15 and the sensor 13. Since the working speed is raised as a whole, the productive efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for manufacturing externally finned tubes used in liquid-liquid or gas-liquid heat exchangers.

[Prior Art] A tube with external fins such as a loaf-in tube is usually used in a fixed tube sheet heat exchanger, and as shown in FIG. , lands 4 without fins are formed alternately. Furthermore, an incomplete fin portion 3 that does not have a sufficient fin shape is formed between the complete fin portion 2 and the land 4.

FIG. 4 shows a conventional manufacturing apparatus for such an externally finned tube. In reality, the processing rolls 5 are
The processing rolls 5 are arranged at equidistant positions, and each processing roll 5 is in close contact with the support device 6 relative to the pipe to be processed 1, and
It is supported so that it can be separated. and,
A plurality of limit switches 7 are arranged along the longitudinal direction of the tube to be processed 1 at appropriate length intervals. In addition,
A magnetic switch may be used instead of the limit switch 7.

In the conventional manufacturing apparatus configured as described above, the tube to be processed 1 is moved at a constant speed in its longitudinal direction, and the processing roll 5 is also driven to rotate at a constant speed. Then, each time the tip of the pipe to be processed 1 contacts the dog of the limit switch 7, the processing roll 5 is opened for a certain period of time to form the land 4. Further, after this certain period of time has elapsed, the processing roll 5 is brought into contact with the pipe to be processed 1 to form the fin portion 1. Incomplete fin portions 3 are formed during the transition period between the contact and separation of the processing rolls 5 with respect to the pipe to be processed 1.

[Problems to be Solved by the Invention] However, in conventional manufacturing equipment, when trying to increase the rotation speed of processing rolls and the movement speed of the pipe to be processed in order to improve productivity, Since the rotational speed of the roll 5 is too fast, the incomplete fin portion 3 becomes long and the length of the effective fin portion 2 becomes short. Moreover, if the rotation at the start of processing is fast, an excessive thrust force acts on the processing roll 5, and the roll is likely to be damaged. Furthermore,
The higher the processing speed, the greater the variation in the formation positions of runs 1-3, the higher the defective rate, and the lower the product yield.

The present invention has been made in view of such problems, and includes:
An object of the present invention is to provide an apparatus for manufacturing an externally finned tube that can improve both productivity and product yield.

[Means for Solving the Problems] An apparatus for manufacturing an externally finned tube according to the present invention is an externally finned tube manufacturing apparatus that forms fins on the outer circumferential surface of a processed tube using processing rolls while moving the processed tube in its longitudinal direction. The attached pipe manufacturing apparatus includes a sensor for detecting the tip position of the pipe to be processed, a moving means for moving the sensor in the longitudinal direction of the pipe to be processed, and a moving means for moving the sensor in the longitudinal direction of the pipe to be processed. The apparatus is characterized by comprising a control means for controlling the start and stop of machining of the machining pipe and the machining speed thereof, and for controlling the moving means to move the sensor to a first, second or third point. .

[Operation] In the present invention, after the sensor detects passage of the tip of the pipe to be processed at the first point, the control means uses the moving means to sequentially move the sensor from the first point to the second point and the third point,
The sensor sequentially detects that the tip of the pipe to be processed passes through the second and third points. Based on the detection result of the tip position of the tube to be processed by this sensor, the control means controls the start and stop of machining of the tube to be processed by the processing rolls and the processing speed. Therefore, for example, when the sensor passes the first point, machining is started, the machining speed is started to increase, the effective fin part is fin-machined at a high speed, and then the tip of the pipe to be machined is at the second point. When passing a point, the processing speed is reduced, and when passing a third point, processing of the pipe to be processed by the processing rolls is stopped, and fin processing is started at a low speed, and the central fin section is processed at a high speed. Fin machining is performed, and the speed is further reduced just before the land (fin unnecessary portion), so that the fin machining can be completed at a low speed. By repeating these operations, fins and lands can be formed alternately on the pipe to be processed, and since fin processing is started and stopped at low speed, the fins and lands can be formed with high precision. At the same time, it is possible to shorten the machining cycle time.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing an apparatus for manufacturing an externally finned tube according to an embodiment of the present invention.

The pipe to be processed 1 is fin-processed by processing rolls 5 and is sent out in its longitudinal direction. In this embodiment, a plurality of insert pins 1
1 are arranged so that their longitudinal directions are parallel to the longitudinal direction of the pipe to be processed 1, and they overlap each other slightly. Each insert pin 1] is driven to rotate in forward and reverse directions around its axis by a motor 12. Further, one non-contact type sensor 13 is disposed for each insert pin 11. This sensor 13 has a sieve hole formed in its support, and the sieve hole is inserted into the sieve hole by an insert pin.
It is installed by screwing into 1. Therefore, this sensor 1
3 reciprocates along the longitudinal direction of the insert pin 11 when the insert pin 11 is driven to rotate forward and backward by the motor 12.

The direction and amount of rotation of the motor 12 are controlled by a control device 14 including a central processing unit (CPU). Further, the sensor 13 detects when the tip of the pipe to be processed 1 passes, and outputs a detection signal to the control device 14.

The control device 14 also controls a drive device that drives the rotation of the processing roll 5 and an opening/closing motor that drives the processing roll 5 to engage and detach from the pipe 1 to be processed.
It controls the biting and removal of the tube 1 to be processed by the processing rolls 5 and the rotational speed of the processing rolls 5.

Furthermore, an input device 15 is connected to the control device 14, and information such as the position of the land 4 (see FIG. 3) is input to the control device 14 and set via this input device 15.

Next, the operation of the apparatus configured as described above will be explained. First, information regarding the position of the land 4 is set in the human power device 15, and this information is input from the input device 15 to the control device 14. The control device 14 sets the first, second, and third detection points for each sensor 13 based on the input signal from the input device 15. As shown in FIG. 2, this first point defines the position at which the machining roll 5 should start biting the pipe to be processed 1, and the second point defines the position at which the machining of the effective fin portion 2 is completed. The third point defines the position at which the fin processing is completed and the processing roll 5 is removed from the pipe 1 to be processed.

The control device 14 outputs a control signal to each motor 12 to position each sensor 13 at the first point. When the tube to be processed 1 is advanced and moved in its longitudinal direction, the sensor 13 screwed onto the insert pin 11 closest to the processing roll 5 detects the tip of the tube to be processed 1, and the detection signal is sent to the control device. 1
4. Then, the control device 14 brings the processing roll 5 into contact with and bites the pipe to be processed 1, and starts fin processing. Then, as shown in FIG. 2, the rotational speed of the processing roll 5 is gradually increased to reach the maximum line speed in a predetermined time after the detection of the first point.

Further, when the sensor 13 detects the tip of the pipe to be processed 1 at the first point, the control device 14 drives the motor 12 to rotate the insert pin 11 at the same time as starting fin processing as described above. Move to 2 points. The sensor 13 waits for the tip of the pipe to be processed 1 to arrive at this second point.

When this sensor 13 detects that the tip of the pipe to be processed 11 has passed at the second point, this detection signal is input to the control device 14 . When the control device 14 receives this detection signal, it reduces the rotational speed of the processing roll 5 and also reduces the line speed, as shown in FIG. Meanwhile, the control device 14 simultaneously drives the motor 12 to immediately move the sensor 13 to the third location.

Then, as the pipe to be processed 1 further advances, the sensor 13
When the passage of the tip of the tube 1 to be processed is detected at the point, the processing roll 5 is separated from the tube 1 to be processed, and the tube 1 to be processed is opened, as shown in FIG.

Thereafter, when the tube 1 to be processed further advances by a predetermined length of the land 4, the tip of the tube 1 to be processed is detected at the first point by the sensor 13 screwed onto the second insert pin 11. Then, the control device 14 inputs the detection signal from this sensor 13, and as shown in FIG. This speed is reached, and then fin machining is continued at this maximum machining speed.

Further, the control device 14 simultaneously moves the sensor 13 to a second point, and the sensor 13 waits for the tip of the pipe to be processed 1 to arrive at this second point.

When the tip of the pipe to be processed 1 reaches the second point, the sensor 13 detects this, and the control device 14 reduces the processing speed (line speed) and moves the sensor 13 to the third point.

Next, when the tip of the pipe to be processed 1 reaches the third point, the sensor 13 detects this and the control device 14 controls the processing roll 5.
is removed from the pipe to be processed 1 and processing is stopped. Thereby, the land 4 is provided.

In this way, as a result of the control device 14 controlling the processing start/stop and rotational speed of the processing roll 5 and the movement of the sensor 13, the pipe to be processed 1 is not processed by the processing roll 5, as shown in FIG. In the land 4 where the machining is not performed, the machining speed is moved at the lowest speed, and when machining is started, the machining speed (line speed) gradually increases and reaches the maximum speed. Next, the processing speed decreases at the end of the effective fin portion 2, reaches the minimum speed, and processing by the processing roll 5 is stopped.

Therefore, when starting and stopping processing by the processing roll 5, the rotational speed of the processing roll is at the lowest speed, so the starting and stopping positions are accurate, and the land 4 is formed with high precision. Therefore, the product yield is high. Further, when the processing roll 5 bites into the pipe to be processed 1, an excessive thrust force is not applied to the processing roll 5, and roll breakage is suppressed.

On the other hand, once the roll processing is started, the processing speed increases and the effective fin portion 2 is processed at the maximum speed. Therefore, the overall machining speed can be extremely high, and for example, a machining speed twice that of the conventional method can be obtained.

Therefore, production efficiency is significantly improved.

As mentioned above, the machining speed can be changed immediately after starting fin machining.
-Control such as raising the fin, lowering the machining speed just before stopping, and processing at a low speed when starting and stopping fin machining can also be configured using a limit switch like in conventional manufacturing equipment. be.

However, in order to perform the above-mentioned control using this limit switch, it is necessary to place a limit switch at each of the first, second, and third points, which requires a significantly larger number of limit switches than in the past. Requires. Also,
The work of arranging the limit switch 5 requires a long time, and the non-operating time becomes long, so that the object of the present invention, which is to increase production efficiency, cannot be achieved.

In contrast, in the embodiment of the present invention described above, it is sufficient to install the same number of sensors 13 as the number of lands, and no work is required for the installation. In the case of a pipe to be processed having a different land position, it is only necessary to change and input the setting of the land position using the input device 15. Therefore, even when manufacturing externally finned tubes of different types, the process can be handled extremely quickly. Furthermore, the device configuration is simple.

Furthermore, if the length of the insert pin 11 is doubled or tripled or more, it becomes possible to collectively control the fin processing for an area including two or three or more lands using one sensor. Therefore, the number of sensors can be further reduced.

[Effects of the Invention] According to the present invention, the sensor is sequentially moved to the first, second and third points, and the tip of the pipe to be processed passes through the first, second and third points, respectively. Since the machining speed of the pipe to be processed is controlled based on this detection result, the overall machining speed can be significantly increased compared to conventional methods while maintaining a high product yield, increasing production efficiency. can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a manufacturing apparatus according to an embodiment of the present invention,
The second figure is a time chart showing changes in the machining speed, the third figure is a cross-sectional view of the externally finned tube, and the fourth figure is a schematic diagram of a conventional manufacturing apparatus. 1; Workpiece pipe, 2; Effective fin portion, 3; Incomplete fin portion, 4; Land, 5; Processing roll, 11 Screw rod, 12; Motor, 13; Sensor, 14; Control device, 15; Input device

Claims (1)

[Claims] (1) In an apparatus for manufacturing an externally finned tube in which fins are formed on the outer circumferential surface of the tube to be processed by processing rolls while moving the tube to be processed in its longitudinal direction, a sensor for detecting the position of the tip of the tube to be processed; , a moving means for moving the sensor in the longitudinal direction of the pipe to be processed, and a means for controlling the start and stop of processing of the pipe to be processed by the processing roll and the processing speed based on the detection result of the sensor; and control means for controlling the means to move the sensor to a first, second or third point.