WO2022109965A1

WO2022109965A1 - Combined three-wire cold-drawing machine

Info

Publication number: WO2022109965A1
Application number: PCT/CN2020/132035
Authority: WO
Inventors: 朱平
Original assignee: 常熟市梅李机械制造有限公司
Priority date: 2020-11-26
Filing date: 2020-11-27
Publication date: 2022-06-02
Also published as: CN112474844A

Abstract

A combined three-wire cold-drawing machine. A proximity switch A (3) is mounted on one side of the surface of a housing (1), three extension frames (4) are provided, the extension frames (4) are mounted on one side of a surface of the housing (1), an electric push rod (10) is mounted at the bottom end of an inner wall of the extension frame (4), a folding rod (8) is welded to one side of a surface of the electric push rod (10), an iron block (9) is fixedly connected to one side of a surface of the folding rod (8), an electromagnet (7) is mounted on the inner wall of the extension frame (4), a lengthening bin (11) is mounted on the surface of the housing (1), three pulling blocks (13) are provided, the pulling blocks (13) are mounted on an inner wall of the lengthening bin (11), three feeding bins (15) are provided, and the feeding bins (15) are mounted on one side of a surface of the lengthening bin (11). According to the combined three-wire cold-drawing machine, the three extension frames are used for supporting and moving a pipe drawn out by the cold-drawing machine, so that the pipe is prevented from falling due to the weight of the pipe and as such bending a product; and feeding is synchronously and automatically conducted by means of the three feeding bins, so that labour consumption is reduced, and the automation degree of the whole machine is higher.

Description

A combined three-wire cold drawing machine

technical field

The invention relates to the technical field of cold drawing machines, in particular to a combined three-wire cold drawing machine.

Background technique

With the 1990s, my country began to study and apply cold-drawn steel pipe technology, cold-drawn steel pipe technology has been widely used in the manufacture of single hydraulic cylinders and construction machinery cylinders, cold-drawn machines are the main processing equipment for cold-drawn steel pipes. It is used for drawing black and non-ferrous metal bar materials at room temperature and secondary processing of waste pipes after hot rolling and extrusion. It is the main processing equipment for producing small diameter, precision, thin wall and high mechanical performance pipes. According to the structure of the bed, the cold drawing machine can be roughly divided into two types: three-seat separation type and frame type. According to the transmission mode, it can be divided into various types of pullers such as chain type, hydraulic transmission type, rack type, and screw type. The drawing trolley is supported by two I-shaped guide rails and driven by the main oil cylinder, so that the trolley runs along the I-shaped guide rails. The main oil cylinder and the drawing trolley can be axially fixed to the trolley body through an adjustable split piston. When drawing the steel pipe, first insert the core rod into the inner hole of the pipe, then install the core head, and then push the front end of the steel pipe with the core head out of the draft seat. Start the pre-tightening cylinder so that the die clamps the steel pipe, the drawing trolley is at the starting position, and the main oil cylinder starts to start drawing. At the same time when the drawing is finished, the pre-tightening cylinder acts, the die loosens the steel pipe fork, and pushes the drawn finished pipe out of the car body. At the same time, the slider moves in the opposite direction, so that the plug head quickly withdraws from the pipe, so that the material can be unloaded smoothly. With the progress of the times and the requirements for the production efficiency of products, the three-wire cold drawing machine is now used more widely. The three-wire cold drawing machine generally includes a draft seat with three built-in molds and a cold drawing trolley arranged on one side of the draft seat. , and the cold-drawing trolley is provided with three vices for holding one end of the steel pipe. When the cold-drawing trolley moves in the opposite direction of the draft seat, the steel pipe passes through the draft seat to change its diameter. In the cold-drawing trolley, due to the large size of the vise, when three vises are arranged, the area of the cold-drawing trolley will be greatly increased. Therefore, when the grinding tool in the drafting seat corresponds to the position of the vise, the overall equipment of the equipment will be greatly enlarged. At the same time, the connection structure between the cold-drawn trolley and the power chain is not reasonable enough, and an additional power device is required to drive the hook to be connected with the power chain, which cannot be mechanized control.

Patent CN207592448U discloses a fully automatic three-wire cold drawing machine. The invention discloses a fully automatic three-wire cold drawing machine, which is composed of a general support and a drawing machine. The middle frame of the general support is provided with a holding plate. The placing plate is welded and fixed with the frame body of the general support, the top of the general support is provided with a sliding top plate on both sides, the sliding top plate on one side is provided with a scale, and a side wall corresponding to the two sliding top plates is provided with a scale. A slide rail, which is fitted and slidably connected to the pulleys on both sides of the pulling machine, a pulling hole is provided on the outside of the pulling machine, and the two side ends adjacent to the pulling hole are provided with connecting frames, and the connecting One end of the frame is welded and fixed to the side end of the pulling machine, and the two ends are embedded in the design of the sliding structure, which effectively collects and processes the drawn steel pipes in a unified manner, thus saving a lot of time for sorting and planning. The information analysis and execution of the motor, the pulling equipment and the information receiver realizes the automation of the pulling machine, thereby avoiding the fatigue caused by manual supervision.

Disadvantages of the above-mentioned automatic three-wire cold drawing machine: 1. When the above-mentioned automatic three-wire cold drawing machine is used, a large amount of manpower needs to be consumed for cold drawing during production, which greatly increases the overall production. 2. When using the above-mentioned fully automatic three-wire cold drawing machine, the automatic discharge of products cannot be carried out very well, which greatly reduces the degree of automation of the whole machine. To this end, we propose a combined three-wire cold drawing machine.

SUMMARY OF THE INVENTION

The invention provides a combined three-wire cold drawing machine, which aims to support and move the pipe pulled out by the cold drawing machine through three extension frames, so that the pipe will not fall due to its own weight and cause the bending of the product. The feeding bins are synchronously and automatically loaded, which greatly reduces the consumption of manpower and makes the entire machine more automated.

The specific technical scheme provided by the present invention is as follows:

A combined three-wire cold drawing machine provided by the present invention includes an outer casing, a proximity switch A is installed on one side of the outer casing surface, an extension frame is installed on one side of the outer casing surface, and there are three extension frames, and the inner wall bottom of the extension frame is at the bottom. An electric push rod is installed at the end, a folding rod is welded on one side of the surface of the electric push rod, an iron block is fixedly connected to the surface of the folding rod, an electromagnet is installed on the inner wall of the extension frame, and a pull rod is installed on the surface of the outer casing. Long warehouse, the inner wall of the elongated warehouse is equipped with pulling blocks and there are three pulling blocks, the surface of the elongated warehouse is installed with three upper silos, and the inner wall of the upper warehouse is welded with spring telescopic rods And there are two spring telescopic rods, an arc-shaped support plate is welded on the other side of the surface of the spring telescopic rod, an arc-shaped baffle is welded on the inner wall of the upper silo, and a hydraulic rod is installed on one side of the surface of the upper silo. A switch is mounted on the surface of the casing.

Optionally, a cold drawing machine is installed on the surface of the casing.

Optionally, a blocking block is installed on the inner wall of the extension frame.

Optionally, a moving wheel is installed on the surface of the arc baffle.

Optionally, the surface of the elongated bin is provided with a feeding port, and the top of the surface of the elongated bin is provided with a powder inlet.

Optionally, the signal output end of the proximity switch A is signal-connected to the proximity switch B and the signal input end of the hydraulic rod.

Optionally, the input end of the switching power supply is electrically connected to the output end of the external power supply through a wire, and the output end of the switching power supply is connected to the cold drawing machine, the proximity switch A and the proximity switch B through a wire, and the proximity switch B power supply The output end is electrically connected with the electric push rod and the input end of the electromagnet power supply through wires.

The beneficial effects of the present invention are as follows:

The embodiment of the present invention provides a combined three-wire cold drawing machine:

1. Now the three-wire cold drawing machine has a wider range of use. The three-wire cold drawing machine generally includes a draft seat with three built-in molds and a cold drawing trolley arranged on one side of the draft seat, and the cold drawing trolley is provided with three For the vise holding one end of the steel pipe, when the cold-drawing trolley moves in the opposite direction of the draft seat, the steel pipe passes through the draft seat to change the diameter of the pipe, so that good cooperation is required when feeding materials. When a combined three-wire cold drawing machine is used, since the surface of the outer casing is installed with a drawing bin, the inner wall of the drawing bin is equipped with three pulling blocks, and the surface side of the drawing bin is equipped with an upper silo and three upper silo. There are two spring telescopic rods welded on the inner wall of the upper silo, there are two spring telescopic rods, the other side of the surface of the spring telescopic rod is welded with an arc-shaped support plate, the inner wall of the upper silo is welded with an arc-shaped baffle, and one side of the upper silo surface is welded A hydraulic rod is installed, a moving wheel is installed on the surface of the curved baffle, a feeding port is opened on the surface of the elongated bin, and a powder inlet is opened on the top of the surface of the elongated bin. Before running the machine, add an appropriate amount to the three feeding bins. At this time, the spring telescopic rod will firmly fix the tube on the inner wall of the upper silo, and then add lubricating powder to the elongated silo through the powder inlet, so that a small amount of lubricating powder can be added. Filling the elongated chamber greatly reduces the use of lubricating powder, and allows the lubricating powder to fully contact the pipeline, thereby producing an effect. As sensed by A, the proximity switch is a position switch that can be operated without mechanical direct contact with moving parts. When the object is close to the sensing surface of the switch to the action distance, the switch can be operated without mechanical contact and any pressure. , so as to drive DC electrical appliances or provide control instructions to computer (plc) devices. Proximity switch is a switch-type sensor (ie, non-contact switch), which has the characteristics of travel switch and micro switch, and has sensing performance, reliable action, stable performance, fast frequency response, long service life, and anti-interference. Strong ability, etc., and has the characteristics of waterproof, shockproof, corrosion resistance and so on. The products are inductive, capacitive, Hall, AC, DC, so that the signal will be transmitted to the hydraulic rod, so that the hydraulic rod will push the uppermost pipe of the feeding bin to push forward, and push the pipe to the inlet. Inside the feed port and pass through the drawing bin, so that when the cold drawing machine returns to the surface of the drawing bin, the pipe can be directly cold drawn, which greatly reduces the labor consumption. After the last pipe is cold drawn , the lower tube will move up under the thrust of the spring telescopic rod, and during the horizontal movement of the tube, the moving wheel on the curved veneer will play a lubricating role, making the tube move more smoothly.

2. During the normal operation of the cold drawing machine, since it is a three-line cold drawing machine that cold-draws three pipes at the same time, if the support and guidance of the subsequent pipes are not handled properly, it will have a great impact on the quality of the product. When using the above-mentioned combined three-wire cold drawing machine, because the proximity switch A is installed on one side of the outer casing surface, the extension frame is installed on one side of the outer casing surface and there are three extension frames, and the bottom end of the inner wall of the extension frame A folding rod is welded on the surface of the push rod, an iron block is fixedly connected to the surface of the folding rod, an electromagnet is installed on the inner wall of the extension frame, a cold drawing machine is installed on the surface of the shell, a blocking block is installed on the inner wall of the extension frame, and the signal output of the proximity switch A is The terminal is connected to the proximity switch B and the signal input terminal of the hydraulic rod. When the cold drawing machine moves backward, it will encounter the first extension frame. At this time, the proximity switch B on the extension frame will receive the signal, so that the The electromagnet and the electric push rod will be activated synchronously, and the electric push rod will push the folding rod forward. At this time, the iron block on the folding rod will be adsorbed by the electromagnet, so that the folding rod will be unfolded. The cold drawing machine has been pulling, and the folding rod starts to support the tube. By analogy, when the cold drawing machine passes through the three extension frames in turn, it will receive the signal from the proximity switch B on its surface and start the electric push rod and electromagnet. , in this way, the pipeline can be supported without affecting the normal operation of the cold drawing machine. After the cold drawing is completed, the cold drawing machine removes the restriction on the pipeline, so that the pipeline will roll to one side under the action of the inclined plane. In this way, manual picking is not required. When the cold drawing machine moves to the rear end of the casing, it will be sensed by the receiving switch A, so that the receiving switch A will conduct the signal to the receiving switch B, thus closing the receiving switch. B. At this time, the electromagnet loses its magnetic force, the folding rod is closed under the action of gravity, and the electric push rod pulls the folding rod to return to its original position, which frees up the space and will not affect the normal operation of the cold drawing machine. .

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic diagram of the overall structure of a combined three-wire cold drawing machine according to an embodiment of the present invention;

2 is a schematic structural diagram of an extension frame of a combined three-wire cold drawing machine according to an embodiment of the present invention;

3 is a schematic structural diagram of a feeding bin of a combined three-wire cold drawing machine according to an embodiment of the present invention;

4 is a schematic structural diagram of an arc baffle of a combined three-wire cold drawing machine according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a drawing bin of a combined three-wire cold drawing machine according to an embodiment of the present invention.

In the figure: 1. Shell; 2. Cold drawing machine; 3. Proximity switch A; 4. Extension frame; 5. Proximity switch B; 6. Blocking block; 7. Electromagnet; 8. Folding rod; 9. Iron block; 10. Electric push rod; 11. Elongating warehouse; 12. Feeding port; 13. Pulling block; 14. Powder feeding port; 15. Feeding bin; 16. Spring telescopic rod; 17. Arc baffle; 18. Moving wheel; 19, hydraulic rod; 20, switch; 21, arc pallet.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

A combined three-wire cold drawing machine according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5 .

Referring to FIGS. 1 to 5 , a combined three-wire cold drawing machine provided by an embodiment of the present invention includes a casing 1 , a proximity switch A3 is installed on one side of the surface of the casing 1 , and a proximity switch A3 is installed on one side of the surface of the casing 1 . The extension frame 4 has three extension frames. An electric push rod 10 is installed at the bottom end of the inner wall of the extension frame 4. A folding rod 8 is welded on the surface side of the electric push rod 10, and the surface side of the folding rod 8 is fixedly connected. There is an iron block 9, an electromagnet 7 is installed on the inner wall of the extension frame 4, an elongated compartment 11 is installed on the surface of the outer casing 1, and a pulling block 13 is installed on the inner wall of the elongated compartment 11, and there are three pulling blocks 13, the said On one side of the surface of the elongated bin 11 is installed an upper bin 15 and there are three loading bins 15. The inner wall of the upper bin 15 is welded with spring telescopic rods 16 and there are two spring telescopic rods 16. The surface of the spring telescopic rod 16 An arc-shaped support plate 21 is welded on the other side, an arc-shaped baffle plate 17 is welded on the inner wall of the upper silo 15 , a hydraulic rod 19 is installed on one side of the surface of the upper silo 15 , and a switch 20 is installed on the surface of the casing 1 .

For example, the three extension frames 4 are used to support and move the pipes pulled out by the cold drawing machine 2, so that the pipes will not fall due to their own weight and cause bending of the products. Feeding the material greatly reduces the consumption of manpower and makes the entire machine more automated.

Referring to FIG. 1 , a cold drawing machine 2 is mounted on the surface of the casing 1 .

Illustratively, the drawing of the pipe is performed by the cold drawing machine 2 .

Referring to FIG. 2 , a blocking block 6 is installed on the inner wall of the extension frame 4 .

For example, external dust and the like are blocked from entering the inner wall.

Referring to FIG. 4 , a moving wheel 18 is installed on the surface of the arc baffle 17 .

Illustratively, the friction between the conduit and the arcuate baffle 17 is reduced.

Referring to FIG. 5 , a feeding port 12 is opened on the surface of the elongated bin 11 , and a powder inlet 14 is opened at the top of the surface of the elongated bin 11 .

For example, the feeding port 12 facilitates the entry of the pipeline and restricts the pipeline from tampering, and the powder feeding port 14 facilitates adding lubricating powder.

Referring to FIG. 1 and FIG. 3 , the signal output end of the proximity switch A3 is signal-connected to the signal input end of the proximity switch B5 and the hydraulic rod 19 .

For example, the proximity switch B5 and the hydraulic rod 19 are controlled by the proximity switch A3.

Referring to Fig. 1, the power input end of the switch 20 is electrically connected to the output end of the external power supply through a wire, and the power output end of the switch 20 is connected to the cold drawing machine 2, the proximity switch A3 and the proximity switch B5 through the wire, so The power output end of the proximity switch B5 is electrically connected with the electric push rod 10 and the power input end of the electromagnet 7 through wires.

For example, the switch 20 is a master switch, and the switch B5 controls the electric push rod 10 and the electromagnet 7 .

When in use, turn on the external power supply and turn on the switch. Since the surface of the casing 1 is installed with the elongated compartment 11, the inner wall of the elongated compartment 11 is installed with pulling blocks 13 and there are three pulling blocks 13, and the upper surface of the elongated compartment 11 is installed. 15 and there are three upper bins 15, the inner wall of the upper bin 15 is welded with spring telescopic rods 16 and there are two spring telescopic rods 16, the other side of the surface of the spring telescopic rod 16 is welded with an arc-shaped support plate 21, the inner wall of the upper bin 15 An arc baffle 17 is welded, a hydraulic rod 19 is installed on one side of the surface of the upper silo 15, a moving wheel 18 is installed on the surface of the arc baffle 17, a feeding port 12 is opened on the surface of the elongated silo 11, and the surface of the elongated silo 11 is provided with a feeding port 12. There is a powder inlet 14 at the top. Before running the machine, add an appropriate amount of pipes to be processed into the three feeding bins 15. At this time, the spring telescopic rod 16 will firmly fix the tubes on the inner wall of the feeding bin 15. At this time, the lubricating powder is added into the elongated bin 11 through the powder inlet 14, so that a small amount of lubricating powder can be filled into the elongated bin 11, which greatly reduces the use of the lubricating powder, and can make the lubricating powder fully When the cold drawing machine 2 is transported backward to the rear end of the casing 1, it will be sensed by the proximity switch A3. The proximity switch is a kind of mechanical direct contact with moving parts that can The operating position switch, when the object is close to the sensing surface of the switch to the action distance, the switch can be actuated without mechanical contact and any pressure, thereby driving the DC electrical appliance or providing control instructions to the computer (plc) device. Proximity switch is a switch-type sensor (ie, non-contact switch), which has the characteristics of travel switch and micro switch, and has sensing performance, reliable action, stable performance, fast frequency response, long service life, and anti-interference. Strong ability, etc., and has the characteristics of waterproof, shockproof, corrosion resistance and so on. The products are inductive type, capacitive type, Hall type, AC type and DC type, so that the signal will be transmitted to the hydraulic rod 19, so that the hydraulic rod 19 will push the uppermost pipe of the upper silo 15 to push forward, and the pipe will be pushed forward. Push it into the feeding port 12 and pass through the drawing bin 11, so that when the cold drawing machine 2 returns to the surface of the drawing bin 11, the pipe can be directly cold drawn, which greatly reduces the labor consumption. After a tube is cold drawn, the lower tube will move upwards under the action of the thrust of the spring telescopic rod 16, and during the horizontal movement of the tube, the moving wheel 18 on the arc-shaped veneer 17 will play a lubricating role. , make the pipe move more smoothly, because the proximity switch A3 is installed on the surface side of the shell 1, the extension frame 4 is installed on the surface side of the shell 1 and there are three extension frames 4, and the bottom end of the inner wall of the extension frame 4 is installed with an electric push rod 10 , a folding rod 8 is welded on the surface of the electric push rod 10, an iron block 9 is fixedly connected to the surface of the folding rod 8, an electromagnet 7 is installed on the inner wall of the extension frame 4, a cold drawing machine 2 is installed on the surface of the outer casing 1, and the extension frame 4 A blocking block 6 is installed on the inner wall, and the signal output end of the proximity switch A3 is connected with the signal input end of the proximity switch B5 and the hydraulic rod 19. When the cold drawing machine 2 moves backward, it will encounter the first extension frame 4. At this time The proximity switch B5 on the extension frame 4 will receive the signal, so that the electromagnet 7 and the electric push rod 10 will be activated synchronously, and the electric push rod 10 will push the folding rod 8 forward. At this time, the iron block 9 on the folding rod 8 It will be adsorbed by the electromagnet 7, so that the folding rod 8 will be unfolded. At this time, since the three pipes are constantly being pulled by the cold drawing machine 2, the folding rod 8 will support the pipes. 2 After passing through the three extension frames 4 in turn, the electric push rod 10 and the electromagnet 7 will be activated after receiving the signal by the proximity switch B5 on its surface, so that the pipeline can be supported without affecting the normal operation of the cold drawing machine 2. When the cold drawing is completed, the cold drawing machine 2 removes the restriction on the pipe, so that the pipe will roll to one side under the action of the inclined plane, so that manual picking is not required, and the cold drawing machine 2 moves to the shell 1. When the rear end of the coil is sensed by the receiving switch A3, the receiving switch A3 will conduct the signal to the receiving switch B5, thus closing the receiving switch B5, at this time the electromagnet 7 loses its magnetic force and folds under the action of gravity The rod 8 is closed, and the electric push rod 10 pulls the folding rod 8 back into place, so that the space is freed, and the normal operation of the cold drawing machine 2 will not be affected.

It should be noted that the present invention is a combined three-wire cold drawing machine, comprising 1. a casing; 2. a cold drawing machine; 3. a proximity switch A; 4. an extension frame; 5. a proximity switch B; 6. a blocking block; 7. Electromagnet; 8. Folding rod; 9. Iron block; 10. Electric push rod; 11. Elongating bin; 12. Feeding port; 13. Pulling block; 14. Powder feeding port; 15. Feeding bin; 16, spring telescopic rod; 17, arc baffle; 18, moving wheel; 19, hydraulic rod; 20, switch; The structure and principle are all known to those skilled in the art through technical manuals or through routine experimental methods.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, provided that these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

A combined three-wire cold drawing machine, comprising a casing (1), characterized in that a proximity switch A (3) is installed on one side of the surface of the casing (1), and an extension frame is installed on one side of the surface of the casing (1) (4) and there are three extension frames (4), an electric push rod (10) is installed at the bottom end of the inner wall of the extension frame (4), and a folding rod (8) is welded on the surface of the electric push rod (10), An iron block (9) is fixedly connected to one side of the surface of the folding rod (8), an electromagnet (7) is installed on the inner wall of the extension frame (4), and an elongated bin (11) is installed on the surface of the outer casing (1). , There are three pulling blocks (13) installed on the inner wall of the elongated bin (11), and an upper silo (15) is installed on one side of the surface of the elongated silo (11) and the upper silo ( 15) There are three, the inner wall of the feeding bin (15) is welded with spring telescopic rods (16) and there are two spring telescopic rods (16), and the other side of the surface of the spring telescopic rods (16) is welded with an arc-shaped bracket. A plate (21), an arc baffle (17) is welded on the inner wall of the upper silo (15), a hydraulic rod (19) is installed on one side of the surface of the upper silo (15), and the surface of the outer casing (1) is A switch (20) is installed.
A combined three-wire cold drawing machine according to claim 1, characterized in that, a cold drawing machine (2) is installed on the surface of the casing (1).
A combined three-wire cold drawing machine according to claim 1, characterized in that a blocking block (6) is installed on the inner wall of the extension frame (4).
A combined three-wire cold drawing machine according to claim 1, characterized in that, a moving wheel (18) is installed on the surface of the curved baffle plate (17).
A combined three-wire cold drawing machine according to claim 1, characterized in that, a feeding port (12) is provided on the surface of the elongated bin (11), and a top of the surface of the elongated bin (11) is provided with a feeding port (12). Powder inlet (14).
A combined three-wire cold drawing machine according to claim 1, characterized in that the signal output end of the proximity switch A (3) is signal-connected with the signal input end of the proximity switch B (5) and the hydraulic rod (19). .
A combined three-wire cold drawing machine according to claim 1, characterized in that, the power input end of the switch (20) is electrically connected with the output end of the external power source through a wire, and the power output end of the switch (20) It is connected with the cold drawing machine (2), the proximity switch A (3) and the proximity switch B (5) through the wire, and the power output end of the proximity switch B (5) is connected with the electric push rod (10) and the electromagnet (7) through the wire ) The power input terminal is electrically connected.