Pipe drawing device

Abstract

The utility model discloses a pipe fitting wire drawing device. The pipe fitting wire drawing device is characterized by comprising a workbench, a product placing frame and a wire drawing mechanism, an air swelling shaft and an air swelling shaft driving part are mounted on the product placing rack, and the air swelling shaft driving part is configured to drive the air swelling shaft to rotate; the wire drawing mechanism is installed on the portion, on the rear side of the air swelling shaft, of the workbench through a connecting mechanism. The wire drawing mechanism is right opposite to the axis direction of the air swelling shaft. The connecting mechanism comprises a lower-layer plate, an upper-layer plate and a driving mechanism, the bottom of the lower-layer plate is transversely arranged on the workbench in a sliding mode, and the upper-layer plate is longitudinally arranged on the upper-layer plate in a sliding mode; the driving mechanism is used for driving the wire drawing mechanism to move left and right and back and forth; an adjusting screw rod is further connected to the lower layer plate in a screwed mode, a limiting plate is arranged at the bottom of the upper layer plate, and the limiting plate is arranged on the rear side of the adjusting screw rod. According to the utility model, the application range is widened, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe production and processing, and in particular to a pipe drawing device. Background Technology

[0002] Brushed finish on the outer surface of stainless steel pipes refers to a surface treatment method that involves grinding lines onto the surface of the raw stainless steel pipe to create a decorative effect. Because brushed finish enhances the texture of the metal material and the resulting matte surface is more wear-resistant than bright stainless steel, it is increasingly widely used in the stainless steel pipe processing industry. However, existing brushed finish equipment often cannot be adapted to the length and diameter of the stainless steel round pipes being processed, and it cannot change brushing modules according to different brushing requirements. This results in poor flexibility and practicality of the equipment, and also necessitates the use of multiple brushing modules, leading to high costs. Summary of the Invention

[0003] The purpose of this utility model is to provide a pipe drawing device. By using this structure, the applicability is improved, the practicality and flexibility are enhanced, and the cost is reduced.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a pipe drawing device, including a workbench, a product placement rack installed on the workbench, and a drawing mechanism;

[0005] The product placement rack is equipped with an air shaft and an air shaft drive unit. The left end of the air shaft is rotatably connected to the product placement rack, and the air shaft drive unit is configured to drive the air shaft to rotate.

[0006] The wire drawing mechanism is mounted on the worktable behind the air shaft via a connecting mechanism, and the wire drawing mechanism is positioned directly opposite the axial direction of the air shaft.

[0007] The connecting mechanism includes a lower plate, an upper plate, and a driving mechanism. The bottom of the lower plate is slidably mounted on the worktable, and the upper plate is slidably mounted on the upper plate.

[0008] The driving mechanism includes a first driving mechanism and a second driving mechanism, which are mounted on the lower plate. The first driving mechanism is configured to drive the lower plate to move laterally on the worktable, and the second driving mechanism is configured to drive the upper plate to move longitudinally on the lower plate, and to position the wire drawing mechanism close to or away from the axis of the air expansion shaft.

[0009] An adjusting screw is screwed onto the lower plate, and a limiting plate is provided at the bottom of the upper plate, with the limiting plate located behind the adjusting screw.

[0010] In the above technical solution, the wire drawing mechanism includes a wire drawing wheel and a third drive unit. The wire drawing wheel is rotatably mounted on the upper plate, and the front end face of the wire drawing wheel is located on the front side of the upper plate, and the wire drawing wheel is positioned directly opposite the axis of the air expansion shaft. The third drive unit is mounted on the upper plate and is configured to drive the wire drawing wheel to rotate.

[0011] In the above technical solution, the axis of the drawing wheel is arranged parallel to the air expansion shaft;

[0012] A connecting shaft is rotatably mounted on the upper plate. The third drive unit includes a third motor assembly. The connecting shaft is located near the front side of the upper plate. The middle part of the drawing wheel is connected to the right end of the connecting shaft. The third motor assembly is connected to the left end of the connecting shaft. The third motor assembly is configured to drive the connecting shaft to rotate.

[0013] In the above technical solution, a dustproof cover is also provided on the outside of the drawing wheel. The front side of the dustproof cover has an opening, and the front end face of the drawing wheel passes through the opening and is located on the outside of the front side of the dustproof cover.

[0014] The dustproof cover has a suction pipe on its rear side that communicates with the inside of the dustproof cover.

[0015] In the above technical solution, the workbench is provided with a transverse guide component, which is arranged parallel to the air expansion shaft, and the bottom of the lower plate is slidably disposed on the transverse guide component.

[0016] In the above technical solution, the first drive mechanism includes a first motor assembly, and a gear is provided on the output shaft of the first motor assembly, the axis of the gear being perpendicular to the air shaft;

[0017] The workbench is equipped with a rack, which is arranged parallel to the air shaft, and the gear meshes with the rack.

[0018] In the above technical solution, the top of the lower plate is provided with a longitudinal guide component, the longitudinal guide component is arranged perpendicular to the air expansion shaft, and the bottom of the upper plate is slidably disposed on the longitudinal guide component.

[0019] In the above technical solution, the second driving mechanism includes a driving cylinder, which is mounted on the lower plate and is located near the rear side of the lower plate; the output shaft of the driving cylinder is connected to the rear side of the limiting plate; when the output shaft of the driving cylinder extends and retracts, it drives the limiting plate and the upper plate to move back and forth, and makes the wire drawing mechanism closer to or further away from the axis of the air expansion shaft.

[0020] In the above technical solution, a vertical plate is provided on the top front side of the lower plate, the middle part of the adjusting screw is screwed to the vertical plate, the rear end of the adjusting screw is provided on the rear side of the vertical plate, and the front end of the adjusting screw is provided on the front side of the vertical plate.

[0021] And / or, an adjusting handwheel is also installed at the front end of the adjusting screw.

[0022] In the above technical solution, a transverse guide rod is provided on the worktable between the air expansion shaft and the lower plate, and the transverse guide rod is arranged parallel to the air expansion shaft;

[0023] The front end of the wire drawing mechanism is located directly above the horizontal guide rod, and at least two photoelectric sensors are installed on the horizontal guide rod, with the detection end of the photoelectric sensors facing upwards.

[0024] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0025] 1. In this utility model, the product is supported and limited by an air shaft, and the air shaft and the product mounted on the air shaft are driven to rotate by the air shaft drive unit. The product is drawn by contact and movement between the wire drawing mechanism and the product. By setting an adjusting screw on the lower plate, the distance between the wire drawing mechanism and the air shaft can be adjusted to suit products of different diameters, thereby improving the applicability and reducing costs.

[0026] 2. In this utility model, the lower plate is driven to move laterally on the worktable by the first driving mechanism, so that the moving direction of the wire drawing mechanism is parallel to the axial extension direction of the air expansion shaft. A photoelectric sensor is set to detect the moving distance and position of the wire drawing mechanism. At the same time, the photoelectric sensor can move on the transverse guide rod. By adjusting the position of the photoelectric sensor, it can be adjusted according to the length of the product, realize the processing of products of different lengths, improve the applicability, and reduce costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of this utility model;

[0028] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure;

[0029] Figure 3 This is a schematic diagram of the wire drawing mechanism and the connecting mechanism in Embodiment 1 of this utility model;

[0030] Figure 4 This is a cross-sectional structural diagram of the connection between the upper and lower plates in Embodiment 1 of this utility model.

[0031] The components include: 1. Workbench; 2. Product placement rack; 3. Wire drawing mechanism; 4. Air shaft; 5. Air shaft drive unit; 6. Lower shelf; 7. Upper shelf; 8. First drive mechanism; 9. Second drive mechanism; 10. Adjusting screw; 11. Limiting plate; 12. Wire drawing wheel; 13. Third drive unit; 14. Coupling shaft; 15. Dustproof cover; 16. Dust suction pipe; 17. Horizontal guide component; 18. Vertical guide component; 19. Gear; 20. Rack; 21. Vertical plate; 22. Adjusting handwheel; 23. Horizontal guide rod; 24. Photoelectric sensor. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0033] Example 1: See Figure 1-4 As shown, a pipe drawing device includes a workbench 1, a product placement rack 2 mounted on the workbench, and a drawing mechanism 3.

[0034] The product placement rack 2 is equipped with an air shaft 4 and an air shaft drive unit 5. The left end of the air shaft 4 is rotatably connected to the product placement rack 2. The air shaft drive unit 5 is configured to drive the air shaft 4 to rotate. The air shaft is used for product positioning.

[0035] The wire drawing mechanism 3 is installed on the worktable 1 behind the air shaft 4 via a connecting mechanism, and the wire drawing mechanism 3 is set directly opposite the plane where the air shaft 4 is located.

[0036] The connecting mechanism includes a lower plate 6, an upper plate 7, and a driving mechanism. The bottom of the lower plate 6 is slidably mounted on the worktable 1, and the upper plate 7 is slidably mounted on the upper plate 6.

[0037] The driving mechanism includes a first driving mechanism 8 and a second driving mechanism 9, which are mounted on the lower plate 6. The first driving mechanism 8 is configured to drive the lower plate 6 to move laterally on the worktable 1, and the second driving mechanism 9 is configured to drive the upper plate 7 to move longitudinally on the lower plate 6, and to make the wire drawing mechanism 3 close to or away from the plane where the air shaft 4 is located.

[0038] An adjusting screw 10 is screwed onto the lower plate 6, and a limiting plate 11 is provided at the bottom of the upper plate 7, with the limiting plate 11 located on the rear side of the adjusting screw 10.

[0039] In this embodiment, during actual use, the product (in this embodiment, the product is a stainless steel tube) is directly fitted onto the air shaft, and then air is supplied to the air shaft (a valve can be set to control the air supply and release of the air shaft to achieve product tensioning and fixing or release). The product is then tensioned by the air shaft. Taking the horizontal arrangement of the air shaft as an example, the left side of the air shaft is rotatably connected to the product placement frame, and the product is inserted into the air shaft from the right side, and then the air shaft is used to tension and fix the product. In the initial state, the wire-drawing mechanism can be positioned to the left or right. Taking the initial state with the wire-drawing mechanism positioned to the left as an example, after the product is fixed, the air shaft drive unit drives the air shaft to rotate. As the air shaft rotates, it simultaneously drives the product on the air shaft to rotate. Then, the second drive mechanism drives the wire-drawing mechanism to move forward, so that the wire-drawing mechanism contacts the rear outer surface of the product. The wire-drawing mechanism draws the outer surface of the rotating product into wires. During this process, the first drive mechanism drives the lower plate, the upper plate, and the wire-drawing mechanism to move to the right, thereby realizing the wire-drawing action on the outer surface of the product at various positions. After the wire drawing is completed, the second drive mechanism drives the upper plate to move backward, away from the product. Then, the air shaft drive unit stops working, and the air shaft releases air, releasing the restriction on the product. The product can then be removed and replaced. To ensure precise contact between the wire drawing mechanism and the outer surface of products of different diameters, preventing damage due to excessive contact force, a separate adjusting screw and limiting plate are installed. When the second drive mechanism moves the upper plate forward, causing the wire drawing mechanism to contact the product, the limiting plate moves forward simultaneously. Once the limiting plate contacts the adjusting screw, the upper plate and the wire drawing mechanism can no longer move forward, thus limiting the forward movement distance of the wire drawing mechanism. This method allows for adjustment of the longitudinal distance between the rear end of the adjusting screw and the front end face of the lower plate, as well as the axis of the air expansion shaft, simply by rotating the adjusting screw. This enables quick adjustments for products of different diameters, expanding its applicability and eliminating the need to replace specific modules in the wire drawing device, thus reducing costs. Similarly, adjusting the lateral movement distance of the lower plate driven by the first drive mechanism for products of different lengths also expands its applicability.

[0040] See Figure 2 , 3 As shown, the wire drawing mechanism 3 includes a wire drawing wheel 12 and a third drive unit 13. The wire drawing wheel 12 is rotatably mounted on the upper plate 7, and the front end face of the wire drawing wheel 12 is located on the front side of the upper plate 7, and the wire drawing wheel 12 is positioned directly opposite the air expansion shaft 4. The third drive unit 13 is mounted on the upper plate 7 and is configured to drive the wire drawing wheel 12 to rotate.

[0041] The axis of the drawing wheel 12 is parallel to the air expansion shaft 4;

[0042] A connecting shaft 14 is rotatably mounted on the upper plate 7. The third drive unit 13 includes a third motor assembly. The connecting shaft 14 is located near the front side of the upper plate 7. The middle part of the drawing wheel 12 is connected to the right end of the connecting shaft 14. The third motor assembly is connected to the left end of the connecting shaft 14. The third motor assembly is configured to drive the connecting shaft 14 to rotate.

[0043] In this embodiment, the third motor assembly can be a single motor or a combination of a motor and a reducer. The third motor assembly is located on the rear side of the connecting shaft and close to the rear side of the upper plate. The wire drawing wheel is installed on the right end of the connecting shaft. The output shaft of the third motor assembly is connected to the left end of the connecting shaft via a belt, chain, or gear. When the third motor assembly is working, it drives the wire drawing wheel to rotate. When the second drive mechanism drives the upper plate to move forward during operation, since the outer surface of the front end of the wire drawing wheel is outside the front side of the upper plate, the rotating wire drawing wheel will contact the outer surface of the product. Preferably, the rotation direction of the wire drawing wheel is opposite to the rotation direction of the product. The wire drawing of the outer surface of the product is achieved by the lateral movement of the wire drawing wheel.

[0044] Furthermore, in this embodiment, the wire drawing wheel is detachably mounted on the coupling shaft, which allows for quick replacement of the wire drawing wheel according to the wire drawing requirements of different products, thus enabling the replacement of the wire drawing module.

[0045] See Figure 2 , 3 As shown, a dust cover 15 is also provided on the outside of the wire drawing wheel 12. The front side of the dust cover 15 has an opening, and the front end face of the wire drawing wheel 12 passes through the opening and is located on the outside of the front side of the dust cover 15.

[0046] The dustproof cover 15 is provided with a suction pipe 16 on the rear side that communicates with the interior of the dustproof cover 15.

[0047] In this embodiment, metal shavings are generated during the wire drawing process. The rear end of the suction pipe is connected to a dust collection device, such as a vacuum cleaner or a dust collection device in the workshop. The negative pressure generated by the suction pipe is used to suck away the metal shavings generated during the wire drawing process, which is more environmentally friendly. The dust cover can also prevent the metal shavings from splashing to other places during the wire drawing process.

[0048] See Figure 1 , 2 As shown, the workbench 1 is provided with a transverse guide component 17, which is arranged parallel to the air shaft 4, and the bottom of the lower plate 6 is slidably disposed on the transverse guide component 17.

[0049] The lower plate 6 is provided with a longitudinal guide component 18 at its top. The longitudinal guide component 18 is arranged perpendicular to the air expansion shaft 4. The bottom of the upper plate 7 is slidably disposed on the longitudinal guide component 18.

[0050] In this embodiment, the transverse guide component adopts a transverse guide rail, and the longitudinal guide component adopts a longitudinal guide rail. The bottom of the lower plate slides on the transverse guide rail, while the upper plate slides on the longitudinal guide rail. The longitudinal guide component is set perpendicular to the transverse guide component and the air shaft. Therefore, the wire drawing mechanism (wire drawing wheel) can move left and right and forward and backward. When the wire drawing mechanism moves left and right, it can draw wires at various positions along the length of the product. When the wire drawing mechanism moves forward, the wire drawing wheel can contact the outer surface of the product to draw wires. When the wire drawing mechanism moves backward, it can move away from the product, making it easier to replace the product.

[0051] See Figure 1-3 As shown, the first drive mechanism 8 includes a first motor assembly, and a gear 19 is provided on the output shaft of the first motor assembly. The axis of the gear 19 is perpendicular to the air shaft 4.

[0052] The workbench 1 is provided with a rack 20, which is arranged parallel to the air shaft 4, and the gear 19 meshes with the rack 20.

[0053] The first motor assembly can be a single motor or a combination of a motor and a reducer. The rack is set parallel to the transverse guide component. In this embodiment, there are two transverse guide components, which are set at intervals. The rack is set parallel to the rear side of the rear transverse guide component. The first motor assembly drives the rotation of the gear. Due to the meshing of the gear and the rack, the lower plate, the upper plate, and the wire drawing mechanism can be moved laterally left and right.

[0054] In this invention, the air shaft drive unit can be a motor or a combination of a motor and a reducer, thereby driving the air shaft to rotate.

[0055] The product placement rack is equipped with an air pipe. The right end of the air pipe connects to the air shaft, while a rotary joint is located on the left side. The rotary joint connects to an external air circuit, which contains a solenoid valve to control the supply of air to or from the air shaft. The rotary joint ensures that when the air shaft is driven to rotate, the air pipe rotates along with it, but the rotary joint remains stationary, thus guaranteeing that the air shaft can properly tighten the product. Alternatively, other structures can be used to ensure both normal air shaft rotation and proper air supply and release (e.g., a rotary joint at the connection between the air shaft and the product placement rack, with the air pipe fixed to the rack; when the air shaft rotates, the rotary joint rotates relative to the air pipe, allowing for air supply and release through the air circuit during rotation).

[0056] See Figure 1-4 As shown, the second driving mechanism 9 includes a driving cylinder, which is mounted on the lower plate 6 and is located near the rear side of the lower plate 6; the output shaft of the driving cylinder is connected to the rear side of the limiting plate 11; when the output shaft of the driving cylinder extends and retracts, it drives the limiting plate 11 and the upper plate 7 to move back and forth, and causes the wire drawing mechanism 3 to be located near or away from the axis of the air expansion shaft 4.

[0057] The drive cylinder is a pneumatic cylinder. The extension and retraction of the cylinder's output shaft moves the upper plate back and forth. When the cylinder output shaft extends, it moves the upper plate forward, bringing the drawing wheel into contact with the outer surface of the product for drawing. When the cylinder output shaft retracts, it moves the upper plate and the drawing wheel backward, away from the product. When the cylinder output shaft extends, it directly moves the limit plate forward. Once the limit plate contacts the adjusting screw, the upper plate can no longer move forward. This allows for precise control of the drawing wheel's forward movement distance and accuracy, ensuring drawing precision and quality.

[0058] See Figure 3 , 4 As shown, a vertical plate 21 is provided on the top front side of the lower plate 6. The middle part of the adjusting screw 10 is screwed to the vertical plate 21. The rear end of the adjusting screw 10 is located on the rear side of the vertical plate, and the front end of the adjusting screw 10 is located on the front side of the vertical plate 21. The vertical plate facilitates the rotation of the adjusting screw, allowing adjustment of the longitudinal distance between the rear end face of the adjusting screw and the outer surface of the front end of the drawing wheel. This allows the advancing distance of the drawing wheel to be adjusted by rotating the adjusting screw according to the diameter of the product.

[0059] See Figure 3 , 4As shown, an adjusting handwheel 22 is also installed at the front end of the adjusting screw 10. The handwheel design allows for easy adjustment of the adjusting screw's position by simply grasping the handwheel, improving convenience and eliminating the need for other tools, thus reducing the workload for operators.

[0060] See Figure 1 , 2 As shown, a transverse guide rod 23 is provided on the worktable 1 between the air expansion shaft 4 and the lower plate 6, and the transverse guide rod 23 is arranged parallel to the air expansion shaft 4;

[0061] The front end of the wire drawing mechanism 3 is positioned directly above the transverse guide rod 23. At least two photoelectric sensors 24 are mounted on the transverse guide rod 23, with the detection ends of the photoelectric sensors 24 facing upwards. In this embodiment, the wire drawing wheel is positioned directly above the transverse guide rod, and the photoelectric sensors are positioned on the longitudinal plane where the wire drawing wheel is located. This allows the photoelectric sensors to detect the wire drawing wheel as it moves forward and contacts the product, and also during its transverse movement.

[0062] In this embodiment, the transverse guide rod is positioned on the front side of the transverse guide component and is located on the worktable between the transverse guide component and the air shaft. The photoelectric sensor and the first drive mechanism are electrically connected. Preferably, at least two photoelectric sensors are provided, one on the left and the other on the right. When the left-side photoelectric sensor detects the drawing wheel moving to the left, it indicates that the drawing wheel has moved to the left and cannot move further to the left, or that further leftward movement is unnecessary. When the right-side photoelectric sensor detects the drawing wheel moving to the right, it indicates that the drawing wheel has moved to the right and cannot move further to the right. By adjusting the position of the photoelectric sensor on the transverse guide rod (the photoelectric sensor can move on the transverse guide rod, or it can be fixed to the transverse guide rod using bolts), the transverse movement trajectory of the drawing wheel can be adjusted according to products of different lengths, processing the product with the shortest stroke, reducing ineffective strokes, improving product processing efficiency, saving energy, and reducing costs.

[0063] Preferably, four photoelectric sensors are used, including two end photoelectric sensors and a position detection photoelectric sensor positioned between the two end photoelectric sensors. The two end photoelectric sensors are respectively located at both ends of the transverse guide rod. If the end photoelectric sensor detects the drawing wheel, it means that the lower plate has moved to the end of the transverse guide component and cannot continue to move in that direction. The position detection photoelectric sensor is adjusted by the operator according to the length of the product. After the position photoelectric sensor detects the drawing wheel, it means that the drawing wheel has drawn the product and moved into position in that direction, and does not need to continue to move in that direction (for example, after the position photoelectric sensor on the left detects the drawing wheel, the drawing wheel does not need to continue to move to the left, but can move to the right to draw the product, or the upper plate moves backward away from the product. Or, when the drawing wheel draws the product from left to right, after the position photoelectric sensor on the left detects the drawing wheel, the drawing wheel can only move to the right until the position sensor on the right detects the drawing wheel, at which point the upper plate moves backward away from the product).

[0064] Moreover, in this embodiment, the wire drawing mechanism is directly mounted on the workbench via the lower plate. The wire drawing mechanism can be disassembled and replaced with different types of wire drawing mechanisms according to actual needs (generally, no replacement is required unless there are special requirements).

[0065] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of the invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. For instance, the two components can be mechanically connected by contact or abutting; they can also be directly hooked or connected by an intermediate medium; or they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A pipe drawing device, characterized in that: Includes a workbench, a product rack mounted on the workbench, and a wire drawing mechanism; The product placement rack is equipped with an air shaft and an air shaft drive unit. The left end of the air shaft is rotatably connected to the product placement rack, and the air shaft drive unit is configured to drive the air shaft to rotate. The wire drawing mechanism is mounted on the worktable behind the air shaft via a connecting mechanism, and the wire drawing mechanism is positioned directly opposite the axial direction of the air shaft. The connecting mechanism includes a lower plate, an upper plate, and a driving mechanism. The bottom of the lower plate is slidably mounted on the worktable, and the upper plate is slidably mounted on the upper plate. The driving mechanism includes a first driving mechanism and a second driving mechanism, which are mounted on the lower plate. The first driving mechanism is configured to drive the lower plate to move laterally on the worktable, and the second driving mechanism is configured to drive the upper plate to move longitudinally on the lower plate, and to position the wire drawing mechanism close to or away from the axis of the air expansion shaft. An adjusting screw is screwed onto the lower plate, and a limiting plate is provided at the bottom of the upper plate, with the limiting plate located behind the adjusting screw.

2. The pipe drawing device according to claim 1, characterized in that: The wire drawing mechanism includes a wire drawing wheel and a third drive unit. The wire drawing wheel is rotatably mounted on the upper plate, and the front end face of the wire drawing wheel is located on the front side of the upper plate, and the wire drawing wheel is positioned directly opposite the axis of the air expansion shaft. The third drive unit is mounted on the upper plate and is configured to drive the wire drawing wheel to rotate.

3. The pipe drawing device according to claim 2, characterized in that: The axis of the drawing wheel is set parallel to the air expansion shaft; A connecting shaft is rotatably mounted on the upper plate. The third drive unit includes a third motor assembly. The connecting shaft is located near the front side of the upper plate. The middle part of the drawing wheel is connected to the right end of the connecting shaft. The third motor assembly is connected to the left end of the connecting shaft. The third motor assembly is configured to drive the connecting shaft to rotate.

4. The pipe drawing device according to claim 2, characterized in that: The drawing wheel is also provided with a dust cover, the front side of which has an opening, and the front end face of the drawing wheel passes through the opening and is located outside the front side of the dust cover; The dustproof cover has a suction pipe on its rear side that communicates with the inside of the dustproof cover.

5. The pipe drawing device according to claim 1, characterized in that: The workbench is provided with a transverse guide component, which is arranged parallel to the air expansion shaft, and the bottom of the lower plate is slidably disposed on the transverse guide component.

6. The pipe drawing device according to claim 1, characterized in that: The first drive mechanism includes a first motor assembly, and a gear is provided on the output shaft of the first motor assembly, the axis of which is perpendicular to the air shaft; The workbench is equipped with a rack, which is arranged parallel to the air shaft, and the gear meshes with the rack.

7. The pipe drawing device according to claim 1, characterized in that: The lower plate is provided with a longitudinal guide component at its top, which is perpendicular to the air expansion shaft, and the bottom of the upper plate is slidably disposed on the longitudinal guide component.

8. The pipe drawing device according to claim 1, characterized in that: The second driving mechanism includes a driving cylinder, which is mounted on the lower plate and is located near the rear side of the lower plate. The output shaft of the driving cylinder is connected to the rear side of the limiting plate. When the output shaft of the driving cylinder extends and retracts, it drives the limiting plate and the upper plate to move back and forth, and causes the wire drawing mechanism to be located near or away from the axis of the air expansion shaft.

9. The pipe drawing device according to claim 1, characterized in that: A vertical plate is provided on the top front side of the lower plate. The middle part of the adjusting screw is screwed to the vertical plate. The rear end of the adjusting screw is located on the rear side of the vertical plate, and the front end of the adjusting screw is located on the front side of the vertical plate. And / or, an adjusting handwheel is also installed at the front end of the adjusting screw.

10. The pipe drawing device according to claim 1, characterized in that: A transverse guide rod is provided on the worktable between the air expansion shaft and the lower plate, and the transverse guide rod is arranged parallel to the air expansion shaft; The front end of the wire drawing mechanism is located directly above the horizontal guide rod, and at least two photoelectric sensors are installed on the horizontal guide rod, with the detection end of the photoelectric sensors facing upwards.

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