JPS585135B2 - Heat exchange tube manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchange tube manufacturing apparatus for manufacturing heat exchange tubes of a predetermined length.

Conventionally, as disclosed in Japanese Patent Publication No. 45-6588, a limit switch LS is provided at the starting end of a pipe-making device to detect the connection in the longitudinal direction of the steel pipe forming band, and a A limit switch LS2 for starting the cutting machine is disposed on the traveling table, and a limit switch LS1 for detecting the fixed length of the steel pipe to be cut is provided in front of the traveling cutting machine, and the limit switch LS
a timer T1 that maintains a time delay long enough for the joint portion in the length direction of the strip to enter the cutting position; and a timer T2 that causes the traveling cutter to start slightly earlier or later than when cutting a fixed length. and the contact of the relay LR1 connected in series with the limit switch LS and the timer T1 are connected in series, and the contact of the timer T1 and the timer T2 are connected in series to cause the traveling cutting machine to oscillate. A device is known in which a steel pipe inserted into the circuit of the limit switch LS1 is formed and welded and then cut into a fixed length using a running cutting machine.

However, in this conventional device, the limit switch LS1 is brought into contact with the pipe to detect the position of the leading end of the pipe and cut the pipe into a fixed length, so when applied to a fin pipe manufacturing device, the fin This has the drawback of causing deformation or unraveling the fins that have been wrapped around the pipe.

Furthermore, the conventional device described above has the disadvantage that the position of the limit switch LS1 must be changed when cutting a pipe of arbitrary length, which cannot be handled automatically.

Further, in the conventional apparatus described above, the cutting position is determined by a limit switch and a timer, and therefore, if there is a fluctuation in the pipe feeding speed, the pipe cannot be cut to a constant length.

An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional techniques, to manufacture heat exchange tubes that can continuously manufacture defect-free fin pipes, and to cut fin pipes to highly accurate lengths. We are in the process of providing equipment.

That is, the present invention is formed by a connecting means for connecting pipes having a predetermined length to each other, a fin winding device for advancing the pipes connected by the connecting means and winding the fins, and the fin winding device. A cutter for cutting the fin pipe is installed between the connecting means and the fin winding device, and a table that reciprocates in parallel with the direction in which the fin pipe is sent out from the fin winding device. and a feed amount detection means that engages with the pipe to detect the feed amount of the pipe, a switch that detects the position of the connection part of the pipe connected by the connection means, and a signal that is detected by the switch. a measuring means for measuring the length L of each pipe by counting the signal detected by the feeding amount detection means with a counter circuit to obtain the feeding amount of the pipe; and the length L of each pipe measured by the measuring means. From L (L-
Δ1l−nl) (where Δ11 is the length from the preset connection part to the leading end of the fin pipe.

l is the preset product length of the fin pipe.

n indicates the product of n grains to be cut next at that point.

), and when the surplus length obtained by the surplus length extraction means is shorter than the length of the product, the front end and the rear end of the connection part are reciprocated with one cutter. The invention is characterized in that it is equipped with a control means for cutting in a two-stage cutting method during the cutting process, thereby simplifying the mechanism and minimizing the cutting length of the steel material part of the material that is continuously fed. This is a heat exchange tube manufacturing device.

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

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

Reference numeral 1 denotes a transfer device that feeds out the pipe material 2 while rotating it, and is equipped with a material feed roller.

Reference numeral 3 denotes a fin winding device that presses and winds fins 4 around the pipe material transferred by the transfer device 1 to form a fin pipe 5.

A cutter 6 for cutting the fin pipe 5 is supported by a rotational drive source 7.

Reference numeral 8 denotes an X-axis feed table that is slidably supported on a base 10 in the Y-axis direction, and is connected to an output piston rond of a cylinder 9 attached to the base 10.

Reference numeral 11 denotes a drive source which is an X-axis feeding motor and rotates a ball screw 12 to move the base 10 in the X-axis direction.

Reference numeral 13 denotes a long pipe material 2 in which the rear end and the leading end of the pipe material are welded and connected using a connecting device such as a welding machine.
This is a first switch that detects the rear end of the pipe material before forming the pipe material.

14 is a second switch that detects that the cutter 6 has returned to the reference position P0 in the X-axis direction.

Reference numeral 15 denotes a feed amount detection means for detecting the feed amount of the pipe material, and is, for example, a rotary encoder connected to the rotating shaft of a roller that engages with the pipe material.

16 is a control circuit for controlling the X-axis feed motor 11, which has a length up to the connection part 17, is reset by a signal from the first switch, counts the number of pulses obtained from the feed rate checking means 15, and controls the pipe Measuring means consisting of a counter circuit (not shown) that measures the length from connection part 17 to connection part 17 of material 2, and connection part 17 preset from the total length of pipe material 2 obtained from the counter circuit. Subtract the length Δ11 from the leading end of the fin pipe to be cut (from the connecting part 17 to the rear end of the broken material), and calculate this value (L - Δ
11) to the product length l of the fin pipe 5 sequentially 0 times (n
includes 0) and a surplus length extraction means consisting of a subtraction circuit (not shown), and as long as the value (L-Δ1l-nl) subtracted by the surplus length extraction means is positive. First, when the rear end of the pipe material 2 is detected by the first switch 13, the feed amount of the pipe material 2 detected by the feed amount detection means 15 is between the point P0 and the distance H where the first switch is installed. When the value obtained by adding Δ11 is reached, the X-axis feed motor 10 is activated and the cutter 6 is moved along the trajectory 18 from point P0 to point P1 at the same speed as the feed speed of the pipe material, thereby cutting the fin pipe that will become the product. Cut the leading end,
When the pipe material 2 returns to point P0 and the feed rate of the pipe material 2 detected by the feed rate detection means 15 reaches the value of the product dimension l, the X-axis feed motor 10 is activated and the cutter 6 follows the trajectory 18. a first control means that travels and sequentially cuts the fin pipe 5 into product dimensions l;
-nl) becomes negative, Δ12=(L-Δ1l-(
The cutter 6 is stopped at point P1 until the value corresponding to the distance obtained by adding n-1) l) and the above Δ11 matches the number of pulses obtained from the feed amount detection means 15, and when this number of pulses matches, A second control means is provided which rotates the shaft feed motor 10 in the normal direction and moves the cutter 6 from point P1 to point P22 at the same speed as the feed speed of the fin pipe to cut the rear end of the fin pipe.

A fin wrapping machine 3 wraps fins 4 around the outer periphery of the pipe material 2 sent out by the transfer device 1 to form a fin pipe 5.

The fin pipe 5 is fed at the same speed as the feed speed of the fin pipe 5 by operating the X-axis feed motor 10 in response to a command from the control circuit 16, and is fed in the Y-axis direction by the power from the cylinder 9. The product is cut into a product length l by the cutter 6 which reciprocates between points P0 and P1 at regular intervals according to the locus of the step cutter cutting path 18.

When the cutter 6 cuts the front side of the connection part 17 of the fin pipe 5, the cutter 6 stops at point P1 according to a command from the control circuit 16 to prevent the connection part 17 of the fin pipe 5 from passing in front of the cutter.

When the connecting portion 17 of the fin pipe 5 passes in front of the cutter 6, the cutter 6 moves again along the second-stage cutter cutting path 19 according to a command from the control circuit 16, and the cylinder 9 sends out the X-axis feed table 8. The fin pipe 5 is cut at the rear end of the connection part 17, and after reaching the 22nd point, the ball screw 12 is reversed by the X transport remoter 10 and the cutter 6 is returned to the P0 point.

Thereafter, until the cutter 6 cuts the part in front of the connection part 17, the cutter 6 follows the cutting path 1 in one step according to the command from the control circuit 16.
Continue cutting the product at step 8.

As explained above, according to the present invention, it is possible to continuously cut the leading end and the trailing end of a steel material having a connection part without sequentially returning the cutter to the origin, so the fin winding machine can continuously cut the fin pipe. This has the effect that a heat exchange tube having a predetermined product size can be manufactured by shortening the length of the steel material while it is being manufactured.

Further, according to the present invention, there is no need to provide a plurality of cutters in parallel, and the mechanism of the cutting device can be simplified.

Further, according to the present invention, the feed rate of the pipe is detected by the feed rate detecting means before the fins are wrapped, so that the fins of the fin pipe around which the fins are wrapped cannot be deformed or the fins can be removed from the pipe. This prevents unraveling and makes it possible to continuously produce defect-free fin pipes.Furthermore, since the feed rate of the pipe is detected by the above-mentioned feed rate detection means, the fin pipes can be manufactured even if the pipe feed rate fluctuates. It has the effect of being able to cut the material to a highly accurate length.

Further, according to the present invention, a fin pipe of any length can be manufactured by simply changing the number set in the counter circuit, and the effect can be easily changed.

[Brief explanation of the drawing]

The figure is a schematic diagram showing an embodiment of the heat exchange tube manufacturing apparatus of the present invention.

Claims (1)

[Scope of Claims] 1. A connecting means for connecting pipes each having a predetermined length L, a fin winding device for advancing the pipes connected by the connecting means and winding a fin, and the fin winding device. A table is installed with a cutter for cutting the fin pipe formed by the fin winding device and moves back and forth in parallel with the direction in which the fin pipe is sent out from the fin winding device, and the pipe is connected by the connection means. a switch for detecting the position of the fin winding device; a feed amount detection device installed between the connecting means and the fin wrapping device and engaging the pipe to detect the feed amount of the pipe; measuring means for measuring the length L of each pipe by counting the signal detected by the feed amount detecting means with a counter circuit to obtain the feed amount of each pipe for each signal; and each pipe measured by the measuring means. From the length L of (L-Δ1l
-nl) (However, Δ11 is the length from the preset connection part to the leading end of the fin pipe. l is the preset product length of the fin pipe. n is the length of the fin pipe with n openings. (indicates that the product is to be cut), and as long as (L-Δ1l-nl) obtained by the extra length extracting means is positive,
A counter circuit counts the signal detected by the feed amount detection means, and every time the pipe feed amount reaches l, the table is moved from the starting point P0 to the intermediate point P1 in synchronization with the feed speed of the fin pipe, and the cutter is cut. The first step is to cut the fin pipe into product length l and return it to the starting point P0.
When the table is moved to the intermediate point P1 by the control means and the first control means, if (L-Δ1l-nl) obtained by the surplus length extraction means becomes negative,
At this intermediate point P1, the signal detected by the feed amount detection means is counted by the counter circuit, and the feed amount of the pipe is determined by the surplus length extraction means.Δ12=L−Δ1l−
The table is stopped until the sum of (n-1)l and Δ11 is reached, and then the table is moved from the intermediate point P1 to the end point P2 in synchronization with the feed speed of the fin pipe, and the cutter guides the fin pipe. A heat exchange tube manufacturing apparatus characterized in that it is equipped with a second control means for cutting the end and returning it to the starting point P0.