Rapid thread milling device

Abstract

The rapid thread milling device comprises a workbench, a first sliding block and a second sliding block are arranged at the upper end of the workbench, one side of the first sliding block is connected with a first hydraulic rod mechanism, the upper end of the first sliding block is connected with a transverse plate through a second hydraulic rod mechanism, and a cutter bar penetrates through the centers of bearings in a plurality of first bearing seats at the upper end of the transverse plate. One end of the cutter bar extends into the four-jaw chuck, the other end of the cutter bar abuts against the tip, the cutter bar penetrates through the center of a bearing in the first bearing seats, the cutter bar is supported through the first bearing seats, the stability of the position of the cutter bar is guaranteed, and the cutter bar drives the cutter head to rotate at a high speed under the action of the first motor; the steel pipe to be machined is supported through the multiple rollers on the second sliding block, the position of the cutter bar is adjusted, the cutter head makes reliable contact with the steel pipe, the steel pipe is machined through the cutter head rotating at a high speed, the acting force borne by the cutter head is reduced, the damage rate of the cutter head is reduced, and therefore the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of steel pipe processing, and particularly relates to a rapid thread milling device. Background Art

[0002] A lathe is a device mainly used for turning a rotating workpiece with a turning tool. Currently, steel pipes are generally processed by a lathe. During processing, one end of the steel pipe is clamped in a four-jaw chuck, and the other end abuts against a center. During the high-speed rotation of the steel pipe, it comes into contact with the cutting tool head on one side of the machine tool to complete the processing operation. During this process, since the cutting tool head is stationary, when the cutting tool head processes the steel pipe, it will be subjected to a large resistance and reaction force, which easily causes damage to the cutting tool head, reduces the service life of the cutting tool head, and frequent replacement of the cutting tool head greatly increases the production cost. Summary of the Invention

[0003] To solve the above problems, the invention provides a rapid thread milling device.

[0004] The invention is realized as follows: A rapid thread milling device includes a workbench. A plurality of first sliders are arranged in parallel on the upper end of the workbench. A plurality of first hydraulic rod mechanisms are horizontally and fixedly arranged on the upper end of the workbench on one side of the first sliders. The end of the first hydraulic rod mechanism is fixedly connected to the middle position on one side of the first slider. The first slider moves horizontally under the action of the first hydraulic rod mechanism. A second hydraulic rod mechanism is vertically and fixedly arranged at the middle position on the upper end of the first slider. A cross plate is horizontally and fixedly arranged at the upper end of the second hydraulic rod mechanism. The cross plate moves up and down under the action of the second hydraulic rod mechanism. A plurality of first bearing seats are vertically and fixedly arranged in parallel on the upper end of the cross plate. A tool rod is horizontally arranged through the center of the inner bearing of the first bearing seat, which not only supports the tool rod to ensure the stability of the tool rod position but also enables the tool rod to rotate smoothly. A cutting tool head perpendicular to the tool rod is fixedly arranged on the tool rod. The length of the cutting tool head is less than the distance between the tool rod and the cross plate. The tool rod drives the cutting tool head to rotate. The two ends of the cross plate are horizontally fixed with a first support plate and a second support plate, and a first frame is fixedly provided on the upper end of the first support plate to ensure the stability of the position of the first frame, and a four-jaw chuck is provided on the side of the first frame close to the tool rod, and the four-jaw chuck corresponds to the position of the tool rod, and one end of the tool rod is clamped by the four-jaw chuck, and a first motor is horizontally fixed on the first support plate on the other side of the first frame, and the shaft column at one end of the four-jaw chuck passes through the center of the bearing on the first frame and is connected to the transmission shaft of the first motor, and the four-jaw chuck is driven to rotate by the first motor, thereby driving the tool rod to rotate, and the upper end of the second support plate is vertically fixed A second frame is vertically arranged, and a third hydraulic rod mechanism is horizontally fixedly arranged on a second supporting plate on a side of the second frame away from the cross plate, and an end of the third hydraulic rod mechanism is fixedly connected to the middle position of the side wall of the second frame. The second frame moves horizontally under the action of the third hydraulic rod mechanism, and a top is horizontally fixedly arranged on a side of the second frame close to the tool rod, and the top corresponds to the position of the tool rod, one end of the tool rod extends into the four-jaw chuck, and the other end of the tool rod is butted against the top. The second frame moves toward one side of the tool rod under the action of the third hydraulic rod mechanism, so that the top and the end of the tool rod are reliably butted against each other. A second slider is arranged at the upper end of the workbench on the side of the first slider away from the first hydraulic rod mechanism to support the steel pipe. The second slider is close to the first slider and the moving directions of the first slider and the second slider are perpendicular to each other, so as to ensure the reliable contact between the cutter head and the steel pipe to be processed. A fourth hydraulic rod mechanism is horizontally fixedly arranged at the upper end of the workbench on one side of the second slider. The end of the fourth hydraulic rod mechanism is fixedly connected to the middle position of one side of the second slider. The second slider moves horizontally under the action of the fourth hydraulic rod mechanism. A plurality of second bearing seats are vertically and symmetrically fixedly arranged at the upper end of the second slider. A shaft rod is horizontally fixedly arranged through the center of the corresponding second bearing seat inner bearing, one end of which is connected to the transmission shaft of the second motor. A plurality of rollers are evenly fixedly arranged on the shaft rods between the second bearing seats, and the steel pipe to be processed is supported by the rollers. The second motor drives the rollers to rotate through the shaft rods. The rollers on the shaft rods connected to the second motor are driving wheels, and the rollers on the shaft rods on the other side not connected to the second motor are driven wheels. Under the action of the second motor, the driving wheel rotates, and the steel pipe to be processed rotates accordingly.

[0005] Preferably, a plurality of first slide grooves are provided on the upper end of the workbench, the width of the first slider is the same as the width of the first slide groove, and the lower end of the first slider is arranged in the first slide groove to ensure that the first slider moves smoothly along the first slide groove to avoid position displacement.

[0006] Preferably, horizontally symmetrical card slots are provided on the inner walls of the workbench on both sides of the first slide groove, and horizontally symmetrical card blocks are fixedly provided on the lower parts of both sides of the first slide block. The card blocks correspond to the positions of the card slots and match in size. The card blocks are arranged in the card slots to ensure a reliable connection between the first slide block and the workbench.

[0007] Preferably, a second slide groove is opened on the upper end of the workbench, the width of the second slide groove is the same as the width of the second slider, and the lower end of the second slider is arranged in the second slide groove to ensure that the second slider moves smoothly along the second slide groove to avoid position displacement.

[0008] Preferably, limiting grooves are symmetrically provided on both sides of the top point on the second support plate, and limiting blocks are vertically symmetrically fixedly provided at the lower end of the second frame body, the limiting blocks correspond to the positions of the limiting grooves, the outer diameter of the limiting blocks is the same as the width of the limiting grooves, the length of the limiting blocks is the same as the thickness of the limiting grooves, and a bottom block is fixedly provided at the lower end of the limiting block, and the outer diameter of the bottom block is larger than the width of the limiting grooves to prevent the limiting block from detaching from the limiting grooves, thereby limiting the position of the second frame body, ensuring the reliable connection between the second frame body and the second support plate, thereby ensuring the reliable connection between the top point and the tool rod.

[0009] Preferably, a first column is vertically fixed on one side of the upper end of the second slide block, a first limiting pulley is horizontally arranged on the upper part of the first column, and a third slide block is vertically arranged on the other side of the upper end of the second slide block, and a fifth hydraulic rod mechanism is horizontally fixed on the upper end of the second slide block on the side of the third slide block away from the first column, and the end of the fifth hydraulic rod mechanism is fixedly connected to the middle position of one side of the third slide block, and the third slide block moves horizontally under the action of the fifth hydraulic rod mechanism. A second column is vertically fixed on the middle position of the upper end of the third slide block, and a second limiting pulley is horizontally arranged on the upper part of the second column, and the positions of the first limiting pulley and the second limiting pulley correspond to each other and have the same height, and the positions of the two ends of the steel pipe to be processed are limited by the first limiting pulley and the second limiting pulley to prevent the steel pipe to be processed from shifting to both sides, and the contact area is small, which does not affect the free rotation of the steel pipe to be processed.

[0010] Preferably, limiting rings are fixedly provided on the first columns at both ends of the first limiting pulley and on the second columns at both ends of the second limiting pulley to limit the positions of the first limiting pulley and the second limiting pulley, and the outer diameter of the limiting ring is smaller than the outer diameter of the first limiting pulley and the second limiting pulley to avoid contact between the limiting ring and the end of the steel pipe.

[0011] Preferably, the first limiting pulley and the second limiting pulley have the same specifications and the distance between the limiting rings is greater than the thickness of the first limiting pulley, thereby ensuring that the first limiting pulley and the second limiting pulley rotate smoothly.

[0012] The beneficial effects of the present invention are as follows: One end of the tool bar extends into the four-jaw chuck, and the other end abuts against the center point. The tool bar passes through the center of the inner bearing of the first bearing block, and the tool bar is supported by multiple first bearing blocks to ensure the stability of the tool bar position. The tool bar drives the tool bit to rotate at high speed under the action of the first motor. Multiple rollers on the second slider support the steel pipe to be processed. By adjusting the position of the tool bar, the tool bit is reliably contacted with the steel pipe, and the steel pipe is processed by the tool bit rotating at high speed, reducing the force received by the tool bit, lowering the breakage rate of the tool bit, and thus reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a top view structural schematic diagram of the present invention; Figure 2 is a sectional structural schematic diagram on one side of the first slider; Figure 3 is a sectional structural schematic diagram on one side of the second slider; Figure 4 is a positional structural schematic diagram of the supporting roller and the steel pipe; In the figure: 1. Workbench; 2. First slider; 3. First hydraulic rod mechanism; 4. Second hydraulic rod mechanism; 5. Cross plate; 6. First bearing block; 7. Tool bar; 8. Tool bit; 9. First support plate; 10. Second support plate; 11. First frame; 12. Four-jaw chuck; 13. First motor; 14. Second frame; 15. Third hydraulic rod mechanism; 16. Center point; 17. Second slider; 18. Fourth hydraulic rod mechanism; 19. Second bearing block; 20. Shaft rod; 21. Second motor; 22. Roller; 23. First chute; 24. Card slot; 25. Card block; 26. Second chute; 27. Limit slot; 28. Limit block; 29. Bottom block; 30. First column; 31. First limit pulley; 32. Third slider; 33. Fifth hydraulic rod mechanism; 34. Second column; 35. Second limit pulley; 36. Limit ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] In order to more clearly understand the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0015] Such as Figures 1-4A fast thread milling device shown in the figure comprises a workbench 1, three first slide blocks 2 are arranged in parallel on the upper end of the workbench 1, three first hydraulic rod mechanisms 3 are horizontally fixedly arranged on the upper end of the workbench 1 on one side of the first slide block 2, the end of the first hydraulic rod mechanism 3 is fixedly connected to the middle position of one side of the first slide block 2, the first slide block 2 moves horizontally under the action of the first hydraulic rod mechanism 3, a second hydraulic rod mechanism 4 is vertically fixedly arranged at the middle position of the upper end of the first slide block 2, a cross plate 5 is horizontally fixedly arranged on the upper end of the second hydraulic rod mechanism 4, the cross plate 5 is lifted and lowered under the action of the second hydraulic rod mechanism 4, a plurality of first bearing seats 6 are vertically fixedly arranged in parallel on the upper end of the cross plate 5, a tool rod 7 is horizontally arranged through the center of the bearing in the first bearing seat 6, which not only supports the tool rod 7 to ensure the stability of the position of the tool rod 7, but also enables the tool rod 7 to rotate smoothly, a tool head 8 perpendicular to the tool rod 7 is fixedly arranged on the tool rod 7, the length of the tool head 8 is less than the distance between the tool rod 7 and the cross plate 5, and the tool rod 7 drives the tool head 8 to rotate, The first support plate 9 and the second support plate 10 are horizontally fixedly arranged at both ends of the cross plate 5, and the first support plate 9 is fixedly arranged with a first frame 11 on the upper end to ensure the stability of the position of the first frame 11, and a four-jaw chuck 12 is arranged on the side of the first frame 11 close to the tool rod 7, and the four-jaw chuck 12 corresponds to the position of the tool rod 7, and one end of the tool rod 7 is clamped by the four-jaw chuck 12, and a first motor 13 is horizontally fixedly arranged on the first support plate 9 on the other side of the first frame 11, and the shaft column at one end of the four-jaw chuck 12 passes through the center of the bearing on the first frame 11 and is connected to the transmission shaft of the first motor 13, and the four-jaw chuck 12 is driven to rotate by the first motor 13, thereby driving the tool rod 7 to rotate, and the upper end of the second support plate 10 is vertical A second frame 14 is provided, and a third hydraulic rod mechanism 15 is horizontally fixedly provided on the second support plate 10 of the second frame 14 on the side away from the cross plate 5. The end of the third hydraulic rod mechanism 15 is fixedly connected to the middle position of the side wall of the second frame 14. The second frame 14 moves horizontally under the action of the third hydraulic rod mechanism 15. A top 16 is horizontally fixedly provided on the side of the second frame 14 close to the tool rod 7. The top 16 corresponds to the position of the tool rod 7. One end of the tool rod 7 extends into the four-jaw chuck 12, and the other end of the tool rod 7 is abutted against the top 16. The second frame 14 moves toward the side of the tool rod 7 under the action of the third hydraulic rod mechanism 15, so that the top 16 and the end of the tool rod 7 are reliably abutted together. On the upper end of the workbench 1 on the side of the first slider 2 away from the first hydraulic rod mechanism 3, a second slider 17 is provided to support the steel pipe. The second slider 17 is close to the first slider 2 and the moving directions of the first slider 2 and the second slider 17 are perpendicular to ensure reliable contact between the tool head 8 and the steel pipe to be processed. Horizontally and fixedly arranged on the upper end of the workbench 1 on one side of the second slider 17 is a fourth hydraulic rod mechanism 18. The end of the fourth hydraulic rod mechanism 18 is fixedly connected to the middle position on one side of the second slider 17. The second slider 17 moves horizontally under the action of the fourth hydraulic rod mechanism 18. Vertically and symmetrically arranged side by side on the upper end of the second slider 17 are a plurality of second bearing seats 19. Horizontally and fixedly arranged through the centers of the inner bearings of the corresponding second bearing seats 19 are shaft rods 20. The end of one of the shaft rods 20 is shaft-connected to the transmission shaft of the second motor 21. Uniformly and fixedly arranged on the shaft rods 20 between the second bearing seats 19 are a plurality of rollers 22. The steel pipe to be processed is supported by the rollers 22. The second motor 21 drives the rollers 22 to rotate through the shaft rods 20. The rollers 22 on the shaft rods 20 connected to the second motor 21 are driving wheels, and the rollers 22 on the shaft rods 20 not connected to the second motor 21 on the other side are driven wheels. Under the action of the second motor 21, the driving wheels rotate, and then the steel pipe to be processed rotates.

[0016] A plurality of first chutes 23 are formed on the upper end of the workbench 1. The width of the first slider 2 is the same as the width of the first chute 23. The lower end of the first slider 2 is arranged in the first chute 23 to ensure that the first slider 2 moves smoothly along the first chute 23 and avoid position deviation. Horizontally and symmetrically formed on the inner walls of the workbench 1 on both sides of the first chute 23 are clamping grooves 24. Horizontally and symmetrically fixedly arranged on the lower parts of both sides of the first slider 2 are clamping blocks 25. The positions of the clamping blocks 25 correspond to those of the clamping grooves 24 and their sizes fit each other. The clamping blocks 25 are arranged in the clamping grooves 24 to ensure reliable connection between the first slider 2 and the workbench 1.

[0017] A second chute 26 is formed on the upper end of the workbench 1. The width of the second chute 26 is the same as the width of the second slider 17. The lower end of the second slider 17 is arranged in the second chute 26 to ensure that the second slider 17 moves smoothly along the second chute 26 and avoid position deviation.

[0018] On both sides of the center point 16 on the second supporting plate 10, limiting grooves 27 are symmetrically formed. At the lower end of the second frame body 14, limiting blocks 28 are vertically and symmetrically fixedly arranged. The positions of the limiting blocks 28 correspond to those of the limiting grooves 27. The outer diameter of the limiting block 28 is the same as the width of the limiting groove 27, and the length of the limiting block 28 is the same as the thickness of the limiting groove 27. At the lower end of the limiting block 28, a bottom block 29 is fixedly arranged. The outer diameter of the bottom block 29 is larger than the width of the limiting groove 27, preventing the limiting block 28 from disengaging from the limiting groove 27, limiting the position of the second frame body 14, ensuring the reliable connection between the second frame body 14 and the second supporting plate 10, and thus ensuring the reliable connection between the center point 16 and the tool bar 7.

[0019] On one side of the upper end of the second slider 17, a first vertical column 30 is vertically fixedly arranged. At the upper part of the first vertical column 30, a first limiting pulley 31 is horizontally arranged. On the other side of the upper end of the second slider 17, a third slider 32 is vertically arranged. On the upper end of the second slider 17 on the side of the third slider 32 away from the first vertical column 30, a fifth hydraulic rod mechanism 33 is horizontally fixedly arranged. The end of the fifth hydraulic rod mechanism 33 is fixedly connected to the middle position on one side of the third slider 32. The third slider 32 moves horizontally under the action of the fifth hydraulic rod mechanism 33. At the middle position of the upper end of the third slider 32, a second vertical column 34 is vertically fixedly arranged. At the upper part of the second vertical column 34, a second limiting pulley 35 is horizontally arranged. The positions of the first limiting pulley 31 and the second limiting pulley 35 correspond to each other and are at the same height. The positions of the two ends of the steel pipe to be processed are limited by the first limiting pulley 31 and the second limiting pulley 35, preventing the steel pipe to be processed from shifting to both sides. The contact area is small and does not affect the free rotation of the steel pipe to be processed. Limiting rings 36 are fixedly arranged on the first vertical column 30 at both ends of the first limiting pulley 31 and on the second vertical column 34 at both ends of the second limiting pulley 35 to limit the positions of the first limiting pulley 31 and the second limiting pulley 35. The outer diameter of the limiting ring 36 is smaller than the outer diameters of the first limiting pulley 31 and the second limiting pulley 35, avoiding contact between the limiting ring 36 and the end of the steel pipe. The first limiting pulley 31 and the second limiting pulley 35 have the same specifications and the distance between the limiting rings 36 is greater than the thickness of the first limiting pulley 31, ensuring the smooth rotation of the first limiting pulley 31 and the second limiting pulley 35.

[0020] During operation, one end of the tool bar 7 is inserted into the four-jaw chuck 12. The third hydraulic rod mechanism 15 drives the center point 16 to move through the second frame body 14, so that the center point 16 abuts against the middle position of the end of the tool bar 7. Place the steel pipe to be processed on the roller 22 and move the steel pipe so that one end of the steel pipe abuts against the first limiting pulley 31. The fifth hydraulic rod mechanism 33 drives the second limiting pulley 35 to move through the third slider 32, so that the second limiting pulley 35 abuts against the other end of the steel pipe. The first hydraulic rod mechanism 3 pushes the first slider 2 to move towards the second slider 17. The second hydraulic rod mechanism 4 adjusts the height of the tool bar 7 so that the tool bit 8 contacts the outer wall of the steel pipe. Start the first motor 13, and the tool bar 7 drives the tool bit 8 to rotate at a high speed. Start the second motor 21, and the steel pipe rotates. The tool bit 8 mills the steel pipe. The fourth hydraulic rod mechanism 18 drives the second slider 17 to move horizontally, thus completing the milling process of the steel pipe.

[0021] The above is only the preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A fast thread milling device, comprising a workbench, characterized in that, A plurality of first sliders are arranged in parallel at the upper end of the workbench, a plurality of first hydraulic rod mechanisms are horizontally fixedly arranged at the upper end of the workbench on one side of the first slider, an end of the first hydraulic rod mechanism is fixedly connected to the middle position of one side of the first slider, a second hydraulic rod mechanism is vertically fixedly arranged at the middle position of the upper end of the first slider, a horizontal plate is horizontally fixedly arranged at the upper end of the second hydraulic rod mechanism, a plurality of first bearing seats are vertically fixedly arranged in parallel at the upper end of the horizontal plate, a tool rod is horizontally arranged through the center of the bearing in the first bearing seat, a tool head perpendicular to the tool rod is fixedly arranged on the tool rod, and the length of the tool head is less than the distance between the tool rod and the horizontal plate, The two ends of the cross plate are horizontally fixed with a first support plate and a second support plate, and a first frame is fixedly arranged on the upper end of the first support plate, and a four-jaw chuck is arranged on the side of the first frame close to the tool rod, and the four-jaw chuck corresponds to the position of the tool rod, and a first motor is horizontally fixedly arranged on the first support plate on the other side of the first frame, and a shaft column at one end of the four-jaw chuck passes through the center of a bearing on the first frame and is connected to a transmission shaft of the first motor, and a second frame is vertically arranged on the upper end of the second support plate, and a third hydraulic rod mechanism is horizontally fixedly arranged on the second support plate on the side of the second frame away from the cross plate, and the end of the third hydraulic rod mechanism is fixedly connected to the middle position of the side wall of the second frame, and a top is horizontally fixedly arranged on the side of the second frame close to the tool rod, and the top corresponds to the position of the tool rod, one end of the tool rod extends into the four-jaw chuck, and the other end of the tool rod is against the top. A second slider is arranged on the upper end of the workbench on the side of the first slider facing away from the first hydraulic rod mechanism, the second slider is close to the first slider and the moving directions of the first slider and the second slider are perpendicular, a fourth hydraulic rod mechanism is horizontally fixedly arranged on the upper end of the workbench on the side of the second slider, the end of the fourth hydraulic rod mechanism is fixedly connected to the middle position of one side of the second slider, a plurality of second bearing seats are vertically and symmetrically fixedly arranged on the upper end of the second slider, a shaft rod is horizontally fixedly arranged through the center of the corresponding bearing in the second bearing seat, one end of the shaft rod is connected to the transmission shaft of the second motor, and a plurality of rollers are evenly fixedly arranged on the shaft rod between the second bearing seats.

2. A rapid thread milling device according to claim 1, characterized in that, A plurality of first slide grooves are provided at the upper end of the workbench, the width of the first sliding block is the same as that of the first slide groove, and the lower end of the first sliding block is arranged in the first slide groove.

3. A rapid thread milling device according to claim 2, characterized in that, The inner wall of the workbench on both sides of the first slide groove is horizontally symmetrically provided with card slots, and the lower part of both sides of the first slide block is horizontally symmetrically fixed with card blocks, the card blocks correspond to the positions of the card slots and match the sizes, and the card blocks are arranged in the card slots.

4. A rapid thread milling device according to claim 1, characterized in that, A second slide groove is provided at the upper end of the workbench. The width of the second slide groove is the same as the width of the second sliding block. The lower end of the second sliding block is arranged in the second slide groove.

5. A rapid thread milling device according to claim 1, characterized in that, The second pallet is symmetrically provided with limiting grooves on both sides of the center point. The lower ends of the second frame body are vertically and symmetrically fixedly provided with limiting blocks. The positions of the limiting blocks correspond to those of the limiting grooves. The outer diameter of the limiting block is the same as the width of the limiting groove, the length of the limiting block is the same as the thickness of the limiting groove, and a bottom block is fixedly provided at the lower end of the limiting block. The outer diameter of the bottom block is greater than the width of the limiting groove.

6. A rapid thread milling device according to claim 1, characterized in that, On one side of the upper end of the second slider, a first vertical column is vertically fixedly provided. A first limiting pulley is horizontally arranged at the upper part of the first vertical column. On the other side of the upper end of the second slider, a third slider is vertically arranged. A fifth hydraulic rod mechanism is horizontally fixedly provided at the upper end of the second slider on the side of the third slider away from the first vertical column. The end of the fifth hydraulic rod mechanism is fixedly connected to the middle position on one side of the third slider. A second vertical column is vertically fixedly provided at the middle position of the upper end of the third slider. A second limiting pulley is horizontally arranged at the upper part of the second vertical column. The positions of the first limiting pulley and the second limiting pulley correspond to each other and they have the same height.

7. A rapid thread milling device according to claim 6, characterized in that, Limiting rings are fixedly provided on the first vertical column at both ends of the first limiting pulley and on the second vertical column at both ends of the second limiting pulley. The outer diameter of the limiting ring is smaller than the outer diameters of the first limiting pulley and the second limiting pulley.

8. A rapid thread milling device according to claim 7, characterized in that, The first limiting pulley and the second limiting pulley have the same specifications and the distance between the limiting rings is greater than the thickness of the first limiting pulley.

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