KR100850391B1 - A pipe-drawing apparatus - Google Patents

Abstract

The present invention relates to a pipe drawing apparatus, comprising: at least two drawing drums installed in a frame (100) and rotated by a driving motor, and a pipe drawing apparatus provided with a pipe drawing die at each drum side. Two upper and lower drums 101 and 102 rotatably mounted on the top of the frame, and two motors 103 and 104 respectively driving the drums independently, the upper drum 101 having a cylindrical support shaft 105 The lower drum 102 is disposed through the hollow interior of the support shaft 105 of the upper drum and is rotated by the motor 104. It is configured to rotate independently of the upper drum to adjust the rate of reduction of the cross-sectional area of the drawing pipe is connected to, so that the two upper and lower drums respectively rotate independently By simply adjusting the cross-sectional area reduction rate of the pipe in one drawing device, the drawing work can be efficiently performed, the labor cost can be reduced, the space utilization of the workplace can be improved, and the cost of auxiliary equipment can be reduced. have.

Pipe drawing device

Description

Pipe Drawing Apparatus {A PIPE-DRAWING APPARATUS}

1 is a schematic view of a conventional pipe drawing device.

2 is a schematic view of another conventional pipe drawing device.

3 is a front view of the pipe drawing apparatus according to the present invention.

4 is a plan view of the pipe drawing device of FIG.

5 is a cross-sectional view of the pipe drawing die of FIG. 4.

Figure 6 is a schematic configuration diagram installed to interlock four pipe drawing apparatus of the present invention in series.

Explanation of symbols on the main parts of the drawings

  100: frame 101, 102: drum

  103, 104: motor 105, 110: support shaft

  300,301,302,303: Drawing device

  304: guide roller

The present invention relates to a pipe drawing apparatus capable of continuously performing a pipe drawing process for drawing a pipe through a die by a traction force due to the rotation of the drum, and in particular, at least two drawing drums are independently driven to rotate the drum. The present invention relates to a pipe drawing apparatus, which is capable of easily obtaining a required cross-sectional area reduction rate by adjusting the efficiency of the pipe drawing.

In general, small diameter pipes are manufactured by joining round ends of metal plates to join ends or drawing through dies. One example of a conventional pipe drawing device for such a pipe drawing is as shown schematically in FIG. 1, the free end of the drawn pipe passing from the idler 2 through the die 3 to a drum driven by a motor ( It is configured to engage with the clamping jaw connected to 1) and to draw with the traction force by the rotational force of the drum 1 so that the diameter is reduced and wound around the drum 1 while the pipe passes through the die.

The pipes which have undergone this drawing process are removed from the upper side in the drum 1 and then transferred to the next drawing process and again drawn through a die having a smaller draw diameter as described above.

For example, in order to form a pipe having an outer diameter of 9.52 φ into a pipe having an outer diameter of 1.8 φ, an outer diameter of 9.52 φ is stepwise through a drawing process of 7.94 φ, 6.35 φ, 4.76 φ, 3.5 φ, and 2.5 φ. To draw to this 1.8 φ, it has to go through six stages of drawing process. Capillaries with an outer diameter of 4 φ or less are used for air conditioning equipment such as refrigerators, air conditioners, water purifiers, and warmers. In addition to these steps, an outer diameter 0.8φ pipe used for the electrode tube can be formed by a drawing process.

In the case of the conventional pipe drawing device, a hoist or a lifter must be used to remove heavy pipes from the drum 1 for pipe transfer to the step-by-step drawing process, and the burden of equipment installation cost increases, and drawing Manpower and time are required for the removal and transfer of pipes. Therefore, when all the six steps of drawing processes are required as described above, the overall drawing time is very long, resulting in low work efficiency.

In order to solve this problem, Applicant's Patent No. 592042 has proposed a drawing device configured to perform a two-step drawing process in one independent drawing device as shown in FIG.

In the drawing apparatus, the drum 41 is formed integrally with the first drum portion 42 and the second drum portion 43, and the first die 44 is disposed in the tangential direction of the first drum portion 42. On the other hand, the second die 45 is arranged in the tangential direction of the second drum portion, a plurality of guide rollers are arranged in a spiral in the drawing pipe conveying path from the first drum portion to the second die to guide the conveying of the drawing pipe. have.

The first and second drum parts are integrally formed and rotated together by a motor through a speed reducer, and are provided below the second drum part having a relatively larger diameter than the first drum part, and the first drum part 42. After the pipe is drawn through the first die 44 by the traction force and wound up in the first drum portion, the drawn pipe wound in the first drum portion is guided by the traction force by the second drum portion 43. Subsequently drawn out from the second die 45 to be wound on the second drum portion, the drawn pipe is elastically enlarged and mounted on the support plate of the bogie that is unwound from the second drum portion and disposed below it. It will be wound on the bobbin.

As a result, the two-stage pipe drawing process is continuously performed in one drawing device, which makes it possible to configure the drawing device more compactly, thereby reducing the space occupied by the drawing device, thereby reducing the burden of expensive land costs. Not only can it be reduced, but it is also possible to reduce the manufacturing cost of the drawing device.

However, in this patent, since the diameters of the two upper and lower drums are fixed and driven together at the same rotational speed by one motor, the reduction ratio of the cross-sectional area of the pipe drawn through the die in the upper drum and wound to the lower drum is fixed constantly. There was. This reduction rate is usually set at 24-30%.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe drawing apparatus, which allows two drums for drawing a pipe of a drawing device to be independently rotatable so that the rate of reduction of the cross-sectional area of the drawn pipe can be adjusted to perform an efficient continuous drawing process. will be.

The pipe drawing apparatus according to the present invention for achieving the above object is at least two drawing drums installed in the frame and rotated by a drive motor, and in the pipe drawing apparatus provided with a pipe drawing die on each drum side And two upper and lower drums rotatably mounted on the top of the frame, and two motors respectively driving the drums independently, wherein the upper drum is connected to a support shaft of a cylindrical structure and rotated by a motor. The lower drum is arranged to penetrate through the hollow inside of the support shaft of the upper drum and is connected to the support shaft rotated by a motor so as to rotate independently of the upper drum to adjust the rate of reduction of the cross-sectional area of the drawing pipe. .

In addition, the rotational speed of the lower drum is increased to increase the rate of reduction of the cross-sectional area of the pipe being drawn.

Hereinafter, with reference to the accompanying drawings showing an embodiment of the present invention will be described in more detail the present invention.

3 and 4 are a front view and a plan view illustrating the configuration of the pipe drawing apparatus of the present invention, the frame 100 and two upper and lower drums 101 and 102 rotatably mounted in a manner suspended from the upper end thereof; It includes two motors 103 and 104 which drive the drums independently of each other.

The bobbin 200 for accommodating the pipe to be drawn and wound under the drum, and when the pipe is drawn and dropped from the drum to be accommodated in the bobbin, the bobbin is transferred to the transfer apparatus 250 installed on the side of the frame 100. A bogie 253 driven by a motor 252 to move. The transfer device is provided with rollers 255 driven by a motor.

The upper drum 101 is connected and supported to the support shaft 105 of the cylindrical structure, the support shaft 105 is rotatably supported by a bearing in the support 107 fixed to the upper end of the frame 100 A worm gear 106 is mounted on the top and rotated by a worm (abbreviated for simplification of the drawing) of the motor 103.

The lower drum 102 is disposed directly below the upper drum 101, and the support shaft 110 is connected to the bearing in the support portion 111 formed to protrude above the support shaft 105 for the upper drum in the frame 100. Is rotatably supported. The lower drum support shaft 110 extends downwardly through the hollow inside of the support shaft 105 of the upper drum 101 and is connected to the lower drum 102 whose lower end is disposed directly below the upper drum. As in the upper drum support shaft 105, the worm gear 112 is also mounted on the lower drum support shaft 110 to be rotated by a worm mounted on the output shaft of the motor 104.

As described above, the lower drum is disposed directly below the upper drum, and the support shaft of the lower drum is disposed through the hollow inside of the support shaft of the upper drum to be driven independently by each motor, that is, by adjusting the respective rotation speeds independently. can do.

Such rotational speed adjustment of the drum can adjust the rate of reduction of the cross-sectional area of the pipe being drawn. That is, the length of the drawn pipe whose cross-sectional area is reduced will be increased because the amount of pipe material drawn out through the die 170, which is schematically shown in FIG. Since the length of the pipe is proportional to the number of revolutions (speed) of the fixed drum, increasing the drum speed further increases the rate of cross-sectional area drawn.

Guide rollers 180 are provided for guiding the drawing pipes transferred from the upper drum to the lower drum.

Depending on the material of the drawn pipe, that is, for the soft material such as copper or aluminum, the cross sectional area reduction rate may be relatively large, but for the relatively hard material, excessive cross sectional area reduction causes breakage of the drawn pipe. It is operating at a cross-sectional rate of reduction of%.

Applicant's Patent No. 592042 discloses two upper and lower drums connected to each other to be driven by a single motor. In this case, the lower drum diameter is larger than the upper drum diameter in order to obtain a set reduction rate. Set it. Thus, since the drum diameter is fixed, the rate of reduction of the cross-sectional area of the drawing pipe is fixed and cannot be adjusted. In this drawing apparatus, in order to adjust the rate of reduction of the cross-sectional area of the drawing pipe, there is a problem in that it is necessary to replace the drum with a different diameter.

However, this problem can be easily solved by adjusting the drum rotation speed by the motor without replacing the drum by arbitrarily selecting and adjusting the cross sectional area reduction rate in order to drive the upper and lower drums respectively to obtain the required diameter of the drawing pipe. .

The table below compares the drawing process by the drawing device having two separate drums and the drawing device of the structure in which two upper and lower drums disclosed in Patent No. 592042 are integrally connected. In the conventional one-drum drawing device and the two-drum drawing device, a cross sectional area reduction rate of 30% or more, for example, 33.4% cannot be obtained at the same drum diameter as in the previous process, so a drum having a diameter of such a reduction rate had to be separately provided. . However, in the present invention, it is possible to adjust the rate of reduction of the cross-sectional area of the drawn pipe by adjusting the rotational speed of the upper drum or the lower drum, respectively, so that the drawing operation can be performed efficiently or at reduced cost.

6 shows a plurality of drawing apparatuses 300, 301, 301 and 303 according to the present invention, for example, four in the drawing, installed in series through the guide roller 304, and continuously from the mother tube to the pipe of the smallest diameter. It is to be able to carry out the drawing process. The guide roller 304 can adjust the tension.

In addition, in the embodiment shown in Figure 6 is shown that four drawing devices are arranged, it is obvious that three or five can be installed as needed.

In the drawing device 300 of the present invention, it is possible to perform the drawing pipe of the required diameter by adjusting the number of revolutions of the upper and lower drums, so if the required drawing pipe is not the minimum diameter, in the middle step, for example, the drawing device ( 301 or the drawing device 302 may terminate the drawing operation.

According to the present invention, the two upper and lower drums are rotated independently of each other to perform a drawing operation so that the rate of reduction of the cross-sectional area of the pipe can be easily adjusted in one drawing device, so that the drawing operation can be efficiently performed. The drawing efficiency is improved compared to the drawing operation in which the drawing section of two drawing drums cannot adjust the cross-sectional area reduction rate of the drawing pipe, and the economic burden of using different diameter drums for adjusting the pipe section area reduction rate is conventionally reduced. There is an advantage that can improve the productivity and work, and by installing a number of equipment linked through the guide roller can improve the work efficiency and labor cost compared to the case of installing the separate pipe drawing devices independently, Improvement of workplace space utilization and additional facilities You can get savings for.

Claims (3)

A pipe drawing device provided on the frame 100 and having at least two drawing drums rotated by a drive motor, and a pipe drawing die on each drum side, wherein the pipe drawing devices are rotatably mounted on the top of the frame. Upper and lower drums 101 and 102 and two motors 103 and 104 respectively driving the drums independently, the upper drum 101 being connected to a support shaft 105 of a cylindrical structure by means of a motor 103. Rotated, the lower drum 102 is connected to the support shaft 110 disposed through the hollow interior of the support shaft 105 of the upper drum and rotated by the motor 104 to adjust the rate of reduction of the cross-sectional area of the drawing pipe. And a pipe drawing device configured to rotate independently of the upper drum. The rotational speed of the lower drum is increased in proportion to the increase in the required pipe cross-sectional area reduction rate in order to increase the cross-sectional area reduction rate of the pipe drawn in the lower drum more than in the upper drum drawing process. Pipe drawing device, characterized in that to be driven. delete

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