Millimeter-scale copper wire drawing convolution cylinder

Abstract

The invention provides a millimeter-scale copper wire drawing convolution cylinder, and relates to the technical field of copper wire processing, the millimeter-scale copper wire drawing convolution cylinder comprises a cylinder body rotatably connected to a mounting rack and a plurality of wire pushing rotating shafts circumferentially and uniformly distributed on the outer side of the cylinder body, the wire pushing rotating shafts are rotatably connected to the mounting rack, and spiral wire guide convex ribs are arranged outside the wire pushing rotating shafts; a partition groove of a single copper wire is formed between every two adjacent circles of wire protruding ribs, and the barrel body and the wire pushing rotating shaft are the same in rotating speed and are driven by a gear motor respectively. The method has the advantages of high machining precision, uniform drawing and the like.

Description

Technical Field

[0001] This invention relates to the field of copper wire processing technology, and more particularly to a millimeter-scale copper wire drawing and winding cylinder. Background Technology

[0002] Copper wire is formed by drawing copper rods multiple times. The copper rods used as raw materials are generally about 1 cm in size. At the millimeter level, continuous drawing is generally used (drawing multiple size levels at once). For micron-level copper wire, drawing is done sequentially (drawing once and winding once) to ensure more precise drawing control.

[0003] During continuous drawing, convolutional cylinders and drawing dies are arranged alternately, and the rotation speed of each convolutional cylinder is controlled (the speed of the rear convolutional cylinder is greater than that of the front convolutional cylinder). This stretches thicker copper wire into thinner copper wire. During the rotation of the convolutional cylinder, the copper wire is arranged in a single layer in a spiral distribution on the surface of the convolutional cylinder. The wire enters at the lower end of the convolutional cylinder and exits at the upper end. Figure 4 As shown, the copper wires entering the convolution cylinder accumulate below the convolution cylinder, pushing the copper wires wound on the convolution cylinder upwards. This results in the convolution cylinder being in a multi-turn wound state, limiting the conduction of the tension difference between the wires on both sides of the convolution cylinder. In order for the wires entering the convolution cylinder to push upwards against other wires wound on the convolution cylinder, an arc transition section is generally provided between the lower end of the convolution cylinder and the mounting base. However, this increases the probability of wire compression. Wire compression will affect the winding and unwinding of the wires and cause wire breakage. In addition, this method will also increase the friction of the wires. When the wires move up on the surface of the convolution cylinder, the resistance is large, and the frictional heat is severe. When the wire diameter is small, the hardness of the wires decreases after being heated. The decrease in hardness, strong compression, and continuous friction will cause defects such as wire deformation and scars, and will also affect the density of the wire structure, thereby affecting the physical and chemical properties of the wires. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes a convolution cylinder mechanism that can improve the uniformity of drawing copper wires with larger diameters.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a millimeter-level copper wire drawing and convolution cylinder, characterized in that it includes a cylinder body rotatably connected to a mounting frame and several wire-pushing shafts evenly distributed circumferentially on the outside of the cylinder body. The wire-pushing shafts are rotatably connected to the mounting frame, and the outside of the wire-pushing shafts has spiral-shaped wire ribs. A single copper wire slot is formed between adjacent wire ribs. The cylinder body and the wire-pushing shafts rotate at the same speed, and the cylinder body and the wire-pushing shafts are each driven by a reduction motor.

[0006] Furthermore, a bushing is slidably connected to the pusher shaft along the axial direction, the wire guide rib is located outside the bushing, and the pusher shaft and the bushing are splinedly connected.

[0007] Furthermore, preload springs are provided at both ends of the bushing between the bushing and the push wire shaft.

[0008] Furthermore, two wire end fixing grooves are longitudinally formed on the cylinder body, and a wire end clamping slider is slidably connected along the groove.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] 1. The copper wire wound around the outer wall of the convolution cylinder is separated into turns by the guide wire ribs, which improves the heat dissipation effect and avoids mutual wear between the wires during the convolution process and the pulling process.

[0011] 2. By controlling the pusher shaft to rotate at the same speed as the cylinder, the copper wires of each coil wound around the outer wall of the cylinder are pushed upward synchronously. Compared with the traditional method of pushing each coil of wire simultaneously, the friction surface between the wound copper wire and the outer wall of the cylinder is divided, forming an independent friction mode between adjacent coils. The traditional method relies on the pushing force generated when the copper wire is wound onto the cylinder to push all the copper wires upward. For the copper wire entering the cylinder, the pressure on the copper wire is relatively large, which can easily damage the copper wire about to enter the cylinder.

[0012] 3. The copper wire is more evenly distributed on the convolution cylinder. In other words, when the inlet and outlet positions are determined, the total length of the copper wire wound on the convolution cylinder is almost constant, while the traditional method has a certain degree of randomness. As we all know, in continuous drawing, the winding length of the convolution cylinder directly affects the drawing size, that is, the drawing size of this solution is more accurate.

[0013] 4. The entry and exit positions of the wire are almost fixed. In the traditional method, due to the randomness of the pushing displacement, there are fluctuations in the entry position of the convolution cylinder, the exit position of the convolution cylinder, the entry angle and the exit angle. Therefore, guide rollers need to be set on both the entry and exit sides of the mold. In addition, the fluctuation of the copper wire routing is also detrimental to the uniformity of drawing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a continuous drawing system.

[0015] Figure 2 This is a three-dimensional schematic diagram of the convolution cylinder.

[0016] Figure 3 This is a planar view of the convolution cylinder.

[0017] Figure 4 This is a schematic diagram of the structure of a convolutional tube in the prior art.

[0018] Explanation of reference numerals in the attached drawings: 1. Mounting bracket; 2. Cylinder body; 3. Push wire shaft; 4. Wire guide rib; 5. Gear motor; 6. Bushing; 7. Preload spring; 8. Wire end fixing groove. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] like Figure 1 As shown, the continuous drawing process includes a wire feeding unit, a wire take-up unit, and several drawing units located between them. Each drawing unit comprises a drawing die and a convolution cylinder. The convolution cylinder needs to be pre-wound a certain number of turns to separate the transmission of tension between the copper wires on both sides. This utilizes the frictional force formed between the copper wire and the cylinder wall after multiple tight turns on the outer wall of the convolution cylinder. During operation, the take-up speed is controlled to be greater than the take-up speed of the preceding convolution cylinder. The closer to the take-up end, the faster the rotation speed of the convolution cylinder, thus generating uniform tension between adjacent convolution cylinders. This scheme is an improvement on the convolution cylinder structure, such as... Figure 2 and Figure 3 As shown, it includes a cylinder 2 rotatably connected to a mounting frame 1 and several push wire shafts 3 evenly distributed around the outside of the cylinder 2. The push wire shafts 3 are rotatably connected to the mounting frame 1. The push wire shafts 3 have spiral wire ribs 4 on their outside. A single copper wire slot is formed between adjacent wire ribs 4. The cylinder 2 and the push wire shafts 3 rotate at the same speed. The cylinder 2 and the push wire shafts 3 are each driven by a geared motor 5.

[0021] During the debugging phase and when winding the initial copper wire onto the cylinder 2, the geared motor 5 needs to be controlled in the reverse direction to make the cylinder 2 rotate in the opposite direction. The copper wire is wound around the top of the cylinder 2 one turn at a time. The copper wire is pushed down one turn at a time by the guide rib 4. The guide rib 4 does not contact the outer wall of the cylinder 2, but has a small gap so that the two do not rotate together. The cylinder 2 and the pusher shaft 3 are driven by their respective geared motors 5 at the same speed. Since the speeds of the two are the same, the pusher shaft 3 also rotates one turn when the cylinder 2 rotates one turn. This ensures that when one turn of copper wire is wound on the cylinder 2, the guide rib 4 can push upward by one spiral spacing of the copper wire wound on the cylinder 2.

[0022] A sleeve 6 is slidably connected to the push shaft 3 along its axial direction. The conductor rib 4 is located outside the sleeve 6, and the push shaft 3 and the sleeve 6 are connected by a spline. Preload springs 7 are installed at both ends of the sleeve 6 and between them and the push shaft 3. The preload springs 7 can mitigate the pushing force of the conductor rib 4 on the copper wire, avoiding rigid contact. Furthermore, during continuous drawing, if a drawing unit experiences a fault, especially a broken wire, the faulty drawing unit needs to be stopped. At this time, the drawing units before and after the faulty unit still need to continue operating. In this case, a certain cylinder 2 may function as either a wire-only release or wire-only take-up unit, requiring the copper wire on the cylinder 2 to move downwards. During wire-only release, the wire end passes through the wire-clamping slider in the wire end fixing groove. The wire clamping slider can move longitudinally within the wire end fixing groove. In the unloading state, the copper wire wound on the outer wall of the cylinder 2 is pushed upward synchronously. In the rewinding state, the wire end is inserted into the wire end fixing groove and slides on the wire clamping slider. At this time, in order to ensure the consistency of the wire entry position and the wire entry angle, the copper wire wound on the outer wall of the cylinder 2 is pushed downward. In summary, the pre-tensioning spring 7 can also effectively eliminate the gap between the conductor rib 4 and the copper wire, and can be more stable and uniform when controlling the copper wire to move up or down.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A millimeter-scale copper wire drawing and convolution cylinder, characterized in that, The device includes a cylindrical body (2) rotatably connected to a mounting frame (1) and several wire-pushing shafts (3) evenly distributed around the outside of the cylindrical body (2). The wire-pushing shafts (3) are rotatably connected to the mounting frame (1). The wire-pushing shafts (3) have spiral wire ribs (4) on their outside. A single copper wire slot is formed between adjacent wire ribs (4). The cylindrical body (2) and the wire-pushing shafts (3) rotate at the same speed. The cylindrical body (2) and the wire-pushing shafts (3) are each driven by a geared motor (5).

2. The millimeter-scale copper wire drawing and convolution cylinder according to claim 1, characterized in that, A bushing (6) is slidably connected to the pusher shaft (3) along the axial direction. The conductor rib (4) is located outside the bushing (6). The pusher shaft (3) and the bushing (6) are connected by a spline.

3. The millimeter-scale copper wire drawing and convolution cylinder according to claim 2, characterized in that, Preload springs (7) are provided at both ends of the bushing (6) and the push wire shaft (3).

4. A millimeter-scale copper wire drawing and convolution cylinder according to claim 1, 2, or 3, characterized in that, Two wire end fixing grooves (8) are longitudinally opened on the cylinder (2), and a wire end clamp slider is slidably connected along the groove inside the wire end fixing groove (8).

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