A limiting mechanism of a wire cutting machine and a wire cutting machine

Abstract

This invention discloses a wire EDM machine, including a worktable assembly and a bed arm mounted on the worktable assembly. It also includes multiple sets of guide wheels arranged within the bed arm according to the molybdenum wire installation requirements. The outer circumferential wall of each guide wheel has a guide wheel groove for guiding the molybdenum wire. A clamping assembly for pressing the molybdenum wire is rotatably mounted on the front end face of each guide wheel. The clamping assembly includes a base plate and a pressure plate. The base plate is located on the outer periphery of the guide wheel, and a groove is provided on the base plate corresponding to the guide wheel groove. The pressure plates are symmetrically distributed on both sides of the groove and are rotatably connected to the base plate. A side plate rotatably connected to the guide wheel is fixed to the front side of the base plate. A limiting member is provided on the guide wheel to restrict the rotation of the side plate. This invention, by rotatably mounting a clamping assembly on the guide wheel, can clamp the passing molybdenum wire, preventing the molybdenum wire wound on the wire spool from loosening due to lack of tension during wire pulling.

Description

Technical Field

[0001] This invention relates to the field of electrical discharge machining technology, specifically to a limiting mechanism for a wire cutting machine and the wire cutting machine itself. Background Technology

[0002] The basic working principle of a wire EDM machine is to use a continuously moving fine metal wire (called an electrode wire) as an electrode to perform pulse spark discharge on the workpiece to remove metal and cut it into shape.

[0003] Existing wire EDM machines mainly consist of a bed, wire spool, molybdenum wire, worktable assembly, and guide wheel assembly. When cutting a workpiece, the molybdenum wire needs to be evenly and densely wound onto the wire spool first. Then, the molybdenum wire on the wire spool is pulled out and passes through the guide wheel assembly on the bed, and then fixed back onto the wire spool to form a loop. The molybdenum wire in the loop passes through the workpiece cutting area on the worktable assembly, so that after the wire spool rotates, the molybdenum wire performs continuous pulse spark discharge on the workpiece to remove metal.

[0004] The existing solutions described above have the following problems: When pulling the molybdenum wire through each guide wheel, the operator needs to maintain a certain tension on the guide wheel to prevent the molybdenum wire at the wire storage drum from loosening during the pulling process. After the molybdenum wire passes through each guide wheel and is fixed on the wire storage drum, the tightness of the molybdenum wire circuit needs to be checked to prevent the molybdenum wire from loosening or breaking during workpiece processing. Furthermore, if the molybdenum wire circuit is found to be not tight enough after installation, the molybdenum wire on the wire storage drum needs to be removed and readjusted. This makes the operation difficult during the molybdenum wire pulling and installation process, especially the installation of the molybdenum wire on the guide wheel inside the machine tool arm above the worktable assembly on the bed. Summary of the Invention

[0005] The purpose of this invention is to provide a limiting mechanism for a wire cutting machine to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wire cutting machine, including a worktable assembly and a bed arm disposed on the worktable assembly, and further including multiple sets of guide wheels disposed in the bed arm according to the molybdenum wire installation requirements. The outer circumferential wall of the guide wheel is provided with a guide wheel groove for guiding the molybdenum wire. The front end face of the guide wheel is rotatably provided with a clamping assembly for clamping the molybdenum wire. The clamping assembly includes a base plate and a pressure plate. The base plate is disposed on the outer periphery of the guide wheel. The base plate is provided with a groove corresponding to the guide wheel groove. The pressure plate is symmetrically distributed on both sides of the groove and is rotatably connected to the base plate. A side plate is fixed on the front side of the base plate and is rotatably connected to the guide wheel. A limiting member is provided on the guide wheel to restrict the rotation of the side plate.

[0007] Preferably, the front end face of the guide wheel is provided with an annular groove, an internal gear ring is rotatably provided in the annular groove, the side plate is fixed on the internal gear ring, and internal teeth are evenly provided on the inner circumference of the internal gear ring. The limiting member includes a pawl rotatably provided in the annular groove for limiting the rotation of the internal gear ring in one direction.

[0008] Preferably, the guide wheel has a cavity, and a main disk is slidably disposed in the cavity along the axial direction of the guide wheel. The bottom of the guide wheel groove is annularly open, and multiple sets of molybdenum wire guide grooves are provided on the circumference of the main disk along the axial direction.

[0009] Preferably, the main disk includes an inner disk and an outer disk. The outer disk is rotatably mounted on the outer periphery of the inner disk via a bearing. The molybdenum wire guide groove is located on the outer periphery of the outer disk. A connecting spindle is provided in the middle of the cavity. The inner disk is sleeved on the connecting spindle and forms a sliding connection with the connecting spindle. An internal hexagon bolt is rotatably mounted on the guide wheel. The internal hexagon bolt passes through the inner disk and forms a threaded connection with the inner disk. A limiting rod is provided on the inner periphery of the inner disk. A limiting groove is provided on the periphery of the connecting spindle for the limiting rod to be engaged.

[0010] A limiting mechanism for a wire cutting machine includes a limiting wheel rotatably disposed on the outer periphery of a guide wheel. The outer circumference of the guide wheel is provided with first teeth on both the front and rear sides of the guide wheel groove. The limiting wheel is provided with a second guide wheel groove for guiding molybdenum wire. The outer circumference of the limiting wheel is provided with a second tooth that meshes with the first teeth. The machine bed arm is provided with a second limiting member for limiting the rotation of the limiting wheel.

[0011] Preferably, the second limiting member includes a gear ring fixed on the bed arm, the limiting wheel is slidably disposed on the guide wheel along the axial direction, and the second tooth engages simultaneously with the inner tooth of the gear ring and the first tooth on the rear side of the guide wheel after the limiting wheel slides.

[0012] Preferably, after the limiting wheel slides and disengages from the inner teeth of the gear ring, the second tooth engages with the first tooth on the front side of the guide wheel.

[0013] Preferably, a first base shaft is provided at the center of the front end face of the guide wheel, and a second base shaft is provided at the center of the front end face of the limiting wheel. A connecting plate is connected between the first base shaft and the second base shaft. The two ends of the connecting plate are rotatably connected to the first base shaft and the second base shaft, respectively. The connection between the connecting plate and the first base shaft also forms a sliding connection along the axial direction of the guide wheel.

[0014] Preferably, the first base shaft is provided with a second limiting groove, and a rod is inserted into the second limiting groove on one side of the connecting plate. A limiting plate is provided in the second limiting groove for the rod. A spring is sleeved on the rod in the second limiting groove. The spring abuts against the limiting plate and drives the limiting plate to move along the bottom of the second limiting groove.

[0015] Preferably, the limiting wheel has a second cavity, and a second main disk is slidably disposed within the second cavity along the axial direction of the limiting wheel. The bottom of the second guide wheel groove is annularly open. Multiple sets of second molybdenum wire guide grooves are provided axially around the second main disk. The second main disk includes a second inner disk and a second outer disk. The second outer disk is rotatably disposed on the outer periphery of the second inner disk via a second bearing. The second molybdenum wire guide grooves are disposed on the outer periphery of the second outer disk. A second main shaft is disposed in the middle of the second cavity. The second inner disk is sleeved on the connecting second main shaft and forms a slidable connection with the second main shaft. A second hexagon socket head cap screw is rotatably disposed on the limiting wheel. The second hexagon socket head cap screw passes through the second inner disk and forms a threaded connection with the second inner disk. A second limiting rod is disposed on the inner periphery of the second inner disk. A third limiting groove is disposed on the periphery of the second main shaft for the second limiting rod to be engaged.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] A clamping component is installed outside the guide wheel groove to prevent the molybdenum wire from pulling back and loosening. The clamping component is rotatably mounted on the guide wheel through the cooperation of the side plate and the internal gear ring. The position of the clamping component can be adjusted according to the position of the molybdenum wire to better pre-tighten the wire. By setting a pawl structure that cooperates with the internal gear ring, the clamping component can be effectively prevented from rotating due to pre-tightening the molybdenum wire while adjusting its position.

[0018] By setting a limit wheel that meshes with the guide wheel, the tension of the molybdenum wire can be adjusted appropriately by rotating the limit wheel, ensuring that the molybdenum wire achieves a more stable effect when cutting the workpiece. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This embodiment is an illustrative diagram highlighting the molybdenum wire, guide wheel, and bed arm in the prior art;

[0021] Figure 2 This is a schematic diagram of the overall structure of this embodiment;

[0022] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle;

[0023] Figure 4 This embodiment is an exploded view highlighting the internal structure of the guide wheel and the limiting wheel;

[0024] Figure 5 This is an exploded view of the connecting plate and the first base shaft and the second base shaft in this embodiment;

[0025] Figure 6 This is a cross-sectional schematic diagram highlighting the internal structure of the guide wheel and the limiting wheel in this embodiment;

[0026] Figure 7 yes Figure 7 Enlarged diagram of part B.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Worktable assembly; 2. Bed arm; 3. Guide wheel; 4. Molybdenum wire; 5. Guide wheel groove; 6. Pressure plate; 7. Groove section; 8. Annular groove; 9. Internal gear ring; 10. Side plate; 12. Pawl; 13. Second short shaft; 14. Cavity; 15. Main disc; 151. Inner disc; 152. Outer disc; 16. Molybdenum wire guide groove; 17. Connecting spindle; 18. Socket head bolt; 19. Limit rod; 20. Limit groove; 21. Limit wheel; 22. First tooth section; 23. Second guide wheel groove; 24. Second toothed section; 25. Gear ring; 26. First base shaft; 27. Second base shaft; 28. Connecting plate; 29. ​​Second limiting groove; 30. Limiting disc; 31. Spring; 32. Second cavity; 33. Second main disc; 331. Second inner disc; 332. Second outer disc; 34. Bearing; 35. Second bearing; 36. Second main shaft; 37. Second internal hex bolt; 38. Second limiting rod; 39. Third limiting groove; 40. Second molybdenum wire guide groove; 41. Third bearing. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-7This invention provides a technical solution: a wire cutting machine, including a worktable assembly 1 and a bed arm 2 disposed on the worktable assembly 1, and further including multiple sets of guide wheels 3 disposed in the bed arm 2 according to the installation requirements of molybdenum wire 4. The outer circumferential wall of the guide wheel 3 is provided with guide wheel grooves 5 for guiding the molybdenum wire 4. A clamping assembly for clamping the molybdenum wire 4 is rotatably disposed on the front end face of the guide wheel 3. The clamping assembly includes a base plate and a pressure plate 6. The base plate is disposed on the outer periphery of the guide wheel 3, and a groove 7 is provided on the base plate corresponding to the guide wheel groove 5. The pressure plate 6 is symmetrically distributed on both sides of the groove 7 and forms a rotatable connection with the base plate. Short shafts inserted into the base plate are provided at both ends of the pressure plate 6 and form a rotatable connection with the base plate through the short shafts. It should be noted that a torsion spring is connected between the short shaft and the base plate. In the initial state, the two base plates form an inclined angle towards one side of the guide wheel groove 5, and the two base plates are close to each other. The side faces are pressed together by the torsion spring. In this way, when the molybdenum wire 4 passes between the two pressure plates 6, it can move upward to facilitate the installation of the molybdenum wire 4. The molybdenum wire 4 is pressed tightly by the two pressure plates 6 rotating towards the side that is close to each other, so that the two side faces are pressed together. This prevents the molybdenum wire 4 from moving downward, thereby preventing the molybdenum wire 4 from pulling back and reducing the difficulty for the operator to maintain a relatively constant tension when pulling and installing the molybdenum wire 4. It should be noted that a small torque is selected for the torsion spring to avoid excessive pressure on the molybdenum wire 4 by the two pressure plates 6 when the molybdenum wire 4 is pulled upward. The front side of the base plate is fixed with a side plate 10 that is rotatably connected to the guide wheel 3. The side plate 10 drives the base plate to rotate, so that the pressure plate 6 is in a suitable position. When the molybdenum wire 4 passes through, it can play a better pre-tightening effect to prevent pullback. The guide wheel 3 is provided with a limiting member to restrict the rotation of the side plate 10.

[0031] Specifically, the front end face of the guide wheel 3 is provided with an annular groove 8, and an internal gear ring 9 is rotatably provided in the annular groove 8. An annular limiting groove 20 is provided on the inner wall of the annular groove 8. An annular limiting plate that is rotatably connected to the annular limiting groove 20 can be provided on the outer periphery of the internal gear ring 9, so that the internal gear ring 9 will not detach from the annular groove 8 when it rotates. The side plate 10 is fixed on the internal gear ring 9. The internal gear ring 9 has internal teeth evenly provided on its inner periphery. The limiting component includes a pawl 12 rotatably provided in the annular groove 8 to limit the rotation of the internal gear ring 9 in one direction. A second short shaft 13 is provided in the annular groove 8. The pawl 12 is rotatably provided on the second short shaft 13, and a second torsion spring is connected between the pawl 12 and the second short shaft 13 so that the pawl 12 can better limit the rotation of the internal gear ring 9 in one direction. By setting the pawl 12 to restrict the rotation of one side of the internal gear ring 9, the position of the pressure plate 6 can be adjusted by rotating the internal gear ring 9, while preventing the pressure plate 6 from driving the internal gear ring 9 to rotate when pre-tightening the molybdenum wire 4 (the pressure plate 6 will be subjected to the reverse force of the molybdenum wire 4 when pressing the molybdenum wire 4, and the pawl 12 can avoid the reverse force from driving the internal gear ring 9 to rotate). It should be noted that the orientation of the internal gear ring 9 and the direction of the pawl 12 restricting the internal gear ring 9 can be adjusted according to whether the molybdenum wire 4 passes the left or right side of the guide wheel 3. If the molybdenum wire 4 is pulled upward from the left side of the guide wheel 3, the pawl 12 will be set to restrict the internal gear ring 9 to rotate counterclockwise; if the molybdenum wire 4 is pulled upward from the right side of the guide wheel 3, the pawl 12 will be set to restrict the internal gear ring 9 to rotate clockwise.

[0032] Specifically, the guide wheel 3 has a cavity 14, and a main disk 15 is slidably arranged in the cavity 14 along the axial direction of the guide wheel 3. The bottom of the guide wheel groove 5 is annularly open. Multiple sets of molybdenum wire guide grooves 16 are arranged axially around the main disk 15. The width of each set of molybdenum wire guide grooves 16 is different and can be adjusted according to the thickness of the molybdenum wire 4 used, so that the guide wheel 3 can guide molybdenum wires 4 of different diameters more stably and has a wider range of applicability. It should be noted that the outer opening of each set of molybdenum wire guide grooves 16 is provided with a connecting surface that forms with the annular opening of the guide wheel groove 5, so that the molybdenum wire guide grooves 16 can guide the molybdenum wire 4 more stably.

[0033] Specifically, the main disk 15 includes an inner disk 151 and an outer disk 152. The outer disk 152 is rotatably mounted on the outer periphery of the inner disk 151 via a bearing 34. A molybdenum wire guide groove 16 is located on the outer periphery of the outer disk 152. When the molybdenum wire 4 moves within the molybdenum wire guide groove 16, the outer disk 152 can rotate to facilitate the guidance of the molybdenum wire 4. A connecting spindle 17 is provided in the middle of the cavity 14. The inner disk 151 is sleeved on the connecting spindle 17 and forms a sliding connection with the connecting spindle 17. An internal hexagon bolt 18 is rotatably mounted on the guide wheel 3. The internal hexagon bolt 18 passes through the inner disk 151 and forms a threaded connection with the inner disk 151. A limiting rod 19 is provided on the inner periphery of the inner disk 151. A limiting groove 20 is provided on the periphery of the connecting spindle 17 for the limiting rod 19 to be engaged. By rotating the internal hexagon bolt 18 with a tool, the inner disk 151 can be moved until the required set of molybdenum wire guide grooves 16 are aligned with the guide wheel groove 5.

[0034] A limiting mechanism for a wire EDM machine includes a limiting wheel 21 rotatably disposed on the outer periphery of a guide wheel 3. The outer circumference of the guide wheel 3 is provided with first teeth 22 on both the front and rear sides of the guide wheel groove 5. The limiting wheel 21 is provided with a second guide wheel groove 23 for guiding a molybdenum wire 4. The outer circumference of the limiting wheel 21 is provided with a second tooth 24 that meshes with the first teeth 22. The bed arm 2 is provided with a second limiting member for limiting the rotation of the limiting wheel 21. After the molybdenum wire 4 is pulled and installed, the limiting wheel 21 can be rotated according to the tightness of the molybdenum wire 4. By pressing the molybdenum wire 4 with the limiting wheel 21, the tension of the molybdenum wire 4 can be adjusted, preventing the molybdenum wire 4 from being removed from the wire storage spool and re-pulled and installed due to insufficient tension after installation.

[0035] Specifically, the second limiting component includes a gear ring 25 fixed on the bed arm 2, a limiting wheel 21 slidably disposed on the guide wheel 3 along the axial direction, and a second tooth 24 simultaneously meshing with the inner teeth of the gear ring 25 and the first tooth 22 on the rear side of the guide wheel 3 after the limiting wheel 21 slides. In the initial state, the second tooth 24 on the limiting wheel 21 simultaneously meshes with the first tooth 22 on the rear side of the guide wheel 3 and the inner teeth of the gear ring 25. At this time, the second tooth 24 does not mesh with the first tooth 22 on the front side of the guide wheel 3. Due to the fixed arrangement of the guide wheel 3 and the gear ring 25, the limiting wheel 21 cannot rotate, so that after the pressure of the limiting wheel 21 on the molybdenum wire 4 is adjusted, it can be fixed in the current position.

[0036] Specifically, after the second tooth 24 disengages from the inner teeth of the gear ring 25 after the limiting wheel 21 slides, it engages with the first tooth 22 on the front side of the guide wheel 3. When it is necessary to drive the limiting wheel 21 to rotate around the guide wheel 3, simply pull the limiting wheel 21 outward to disengage it from both the inner teeth of the gear ring 25 and the first tooth 22 on the rear side of the guide wheel 3. At the same time, the second tooth 24 on the front side of the limiting wheel 21 engages with the first tooth 22 on the front side of the guide wheel 3. The limiting wheel 21 rotates by engaging with the guide wheel 3. After rotating to the required position, the limiting wheel 21 is slid backward again to restore the second tooth 24 to the position where it is simultaneously engaged with both the inner teeth of the gear ring 25 and the first tooth 22 on the rear side of the guide wheel 3.

[0037] Specifically, a first base shaft 26 is provided at the center of the front end face of the guide wheel 3, and a second base shaft 27 is provided at the center of the front end face of the limiting wheel 21. A connecting plate 28 is connected between the first base shaft 26 and the second base shaft 27. The two ends of the connecting plate 28 are rotatably connected to the first base shaft 26 and the second base shaft 27 respectively. The second base shaft 25 and the connecting plate 28 are rotatably connected through a third bearing 41. The connection between the connecting plate 28 and the first base shaft 26 is also slidably connected along the axial direction of the guide wheel 3. By pulling the connecting plate 28 outward, the limiting wheel 21 can be driven to slide along the axial direction. Furthermore, by rotating the connecting plate 28, the limiting wheel 21 can be driven to rotate around the circumference of the guide wheel 3.

[0038] Specifically, the first base shaft 26 is provided with a second limiting groove 29. One side of the connecting plate 28 is inserted into the second limiting groove 29 and a rod is provided. The rod is located in the second limiting groove 29 and a limiting plate 30 is provided. The rod is located in the second limiting groove 29 and a spring 31 is sleeved. The spring 31 abuts against the limiting plate 30 and drives the limiting plate 30 to move along the bottom of the second limiting groove 29. The setting of the spring 31 allows the limiting wheel 21 to mesh with the inner tooth of the gear ring 25 and the first tooth 22 of the rear of the guide wheel 3 simultaneously in the initial state.

[0039] Specifically, the limiting wheel 21 has a second cavity 32, and a second main disk 33 is slidably disposed within the second cavity 32 along the axial direction of the limiting wheel 21. The bottom of the second guide wheel groove 23 is annularly open. Multiple sets of second molybdenum wire guide grooves 40 are provided axially around the second main disk 33. The second main disk 33 includes a second inner disk 331 and a second outer disk 332. The second outer disk 332 is rotatably disposed on the outer periphery of the second inner disk 331 via a second bearing 35. The second molybdenum wire guide grooves 40 are disposed on the outer periphery of the second outer disk 332. A second main shaft 36 is provided in the middle of the second cavity 32. The second inner disk 331 is sleeved on the second main shaft 36 and is shaped with the second main shaft 36. The two inner plates are connected in a sliding manner. A second hexagonal socket head cap screw 37 is rotatably mounted on the limiting wheel 21. The second hexagonal socket head cap screw 37 passes through the second inner plate 331 and forms a threaded connection with the second inner plate 331. A second limiting rod 38 is provided on the inner circumference of the second inner plate 331. A third limiting groove 39 is provided on the circumference of the second main shaft 36 for the second limiting rod 38 to be engaged. It should be noted that in the initial state, the guide wheel groove 5 and the second guide wheel groove 23 are set opposite to each other. By rotating the second hexagonal socket head cap screw 37 with a tool, the second inner plate 331 can be moved until the required set of second molybdenum wire guide grooves 40 are aligned with the second guide wheel groove 23 and matched with the molybdenum wire guide groove 16 in the guide wheel 3.

[0040] A specific application example of this embodiment is as follows:

[0041] Reference Figure 1 The molybdenum wire 4 is pulled vertically upwards from the worktable assembly 1 and then pulled out of the bed arm 2 after passing through multiple guide rollers 3. The specific location and number of guide rollers 3 on the bed arm 2 will vary depending on the model of the wire cutting machine. This is existing technology and will not be elaborated further.

[0042] Reference Figure 2 , 3When installing the molybdenum wire 4, the internal gear ring 9 can be rotated according to the path of the guide wheel 3 inside the bed arm 2 of the molybdenum wire 4. Rotating the internal gear ring 9 will drive the base plate to rotate to the position where the molybdenum wire 4 will pass. After adjusting the base plate to a suitable position by rotating the internal gear ring 9, the molybdenum wire 4 can be pulled and installed. When the molybdenum wire 4 is pulled into the guide wheel 3 inside the bed arm 2, the molybdenum wire 4 will first pass between the two sets of pressure plates 6 at the corresponding guide wheel 3. Since the pressure plates 6 on both sides are rotatably connected to the base plate, when the molybdenum wire 4 is pulled upward, the pressure plates 6 on both sides will rotate slightly upward. When the molybdenum wire 4 passes through the guide wheel groove 5 of the guide wheel 3 and is pulled to the next set of guide wheels 3, it cannot rotate downward because the pressure plates 6 on both sides are in an upward tilt angle after they are pressed together. The pressure plates 6 on both sides will press the molybdenum wire 4 and restrict the downward movement of the molybdenum wire 4, thereby pre-tightening the molybdenum wire 4. The operator can then easily pull the molybdenum wire 4 to the next set of guide wheels 3. Even if the molybdenum wire 4 is not continuously tightened during this period, the molybdenum wire 4 in the molybdenum wire 4 spool can be prevented from loosening, effectively reducing the difficulty of the operator in installing the molybdenum wire 4.

[0043] Reference Figure 2 , 4 Before installing the molybdenum wire 4, the thickness of the molybdenum wire 4 can be adjusted to allow the annular opening of the molybdenum wire guide groove 16 on the outer disc 152 to align with the guide wheel groove 5. Adjustment is achieved by rotating the hexagonal socket head cap screw 18 inside the guide wheel 3. The rotation of the hexagonal socket head cap screw 18 will cause the inner disc 151 to rotate within the cavity 14 (see reference). Figure 6 The inner movement of the molybdenum wire 4 causes the outer disk 152 to move, so that the annular opening of the molybdenum wire 4 mating groove and the guide wheel groove 5 are opposite each other.

[0044] Reference Figure 1 , 2 3. When the inner gear ring 9 rotates and drives the substrate to the required position to pre-tighten the molybdenum wire 4, the pre-tightened molybdenum wire 4 will be subjected to the reaction force of the molybdenum wire 4. The engagement of the pawl 12 with the inner teeth of the inner gear ring 9 can prevent the molybdenum wire 4 from pulling down and causing the inner gear ring 9 to rotate. It should be noted that: which side of the rotation of the inner gear ring 9 is restricted by the pawl 12 can be determined according to whether the molybdenum wire 4 passes by the left or right side of the guide wheel 3. The orientation of the inner teeth of the inner gear ring 9 and the setting of the pawl 12 can be adjusted according to the direction of rotation of the inner gear ring 9. If the molybdenum wire 4 is pulled upward from the right side of the guide wheel 3, the clockwise rotation of the inner gear ring 9 needs to be restricted by the pawl 12. If the molybdenum wire 4 is pulled upward from the left side of the guide wheel 3, the counterclockwise rotation of the inner gear ring 9 needs to be restricted by the pawl 12.

[0045] Reference Figure 3 After the molybdenum wire 4 is installed, drive the pressure plates 6 on both sides to rotate upward. At the same time, rotate the internal gear ring 9 to make the pressure plate 6 disengage from the molybdenum wire 4. This prevents the pressure plate 6 from still pressing the molybdenum wire 4 when the molybdenum wire 4 is processing the workpiece. It should be noted that after the pressure plate 6 disengages from the molybdenum wire 4, the groove 7 located on one side of the pressure plate 6 has space for the molybdenum wire 4 to pass through and fall into the guide groove.

[0046] Example 2

[0047] Reference Figure 2 This embodiment is an improvement on the previous embodiment. The present invention designs the guide wheel 3 inside the bed arm 2 in the prior art, wherein a set of guide wheels 3 is equipped with a toothed ring 25 and a limiting wheel 21 (after the molybdenum wire 4 completes the circuit installation, the tension will not be too small, and only a set of guide wheels 3 is equipped with a limiting wheel 21 to adjust the tension of the molybdenum wire 4 after installation).

[0048] Reference Figure 5 , 6 7. After the molybdenum wire 4 is installed in the stroke circuit, if the tension of the molybdenum wire 4 is found to be insufficient, the tension of the molybdenum wire 4 can be increased by rotating the limit wheel 21 to appropriately tighten the molybdenum wire 4. When rotating the limit wheel 21, first pull the connecting plate 28 outward. Pulling the connecting plate 28 will cause the limit plate 30 to compress the spring 31 and slide in the second limit groove 29. At the same time, the other side of the connecting plate 28 pulls the limit wheel 21, causing the second tooth 24 on the rear side of the limit wheel 21 to disengage from the teeth in the gear ring 25 and the first tooth 22 on the rear side of the guide wheel 3. At the same time that the second tooth 24 disengages from the teeth in the gear ring 25, the second tooth 24 on the front side of the limit wheel 21 will mesh with the first tooth 22 on the front side of the guide wheel 3. (By rotating the limit wheel 21 in this way, the limit wheel 21 can be rotated to any position and pass through.) (The sliding ring 25 engages with the inner teeth of the gear ring 25), and then the connecting plate 28 is rotated. At this time, the limiting wheel 21 rotates through the engagement of the first tooth 22 and the second tooth 24 until the molybdenum wire 4 is pressed to the required degree. Then the connecting plate 28 can be released. Under the action of the spring 31, the limiting plate 30 will be driven to slide towards the bottom of the second limiting groove 29, so that the second tooth 24 on the rear side of the limiting wheel 21 returns to engaging with the inner teeth of the gear ring 25 and the first tooth 22 on the rear side of the guide wheel 3 (the thickness of the inner teeth of the gear ring 25 is the same as the thickness of the first tooth 22 on one side), thereby restricting the limiting wheel 21 from continuing to rotate.

[0049] Reference Figure 4 According to the molybdenum wire guide groove 16 with a set of groove widths in the guide wheel 3, and the annular opening of the guide wheel groove 5, the second internal hex bolt 37 is adjusted and rotated to drive the second inner plate 331 to slide in the second cavity 32 until the second molybdenum wire guide groove 40 on the second outer plate 332, which corresponds to the molybdenum wire guide groove 16, is connected to the annular opening of the second guide wheel groove 23, so that the molybdenum wire 4 is inserted into the second molybdenum wire guide groove 40. It should be noted that after the molybdenum wire 4 is installed, the guide wheel groove 5 and the second guide wheel groove 23 of each set of guide wheels 3 in the bed arm 2 are all on the same horizontal plane to ensure the stability of guiding the molybdenum wire 4.

[0050] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing this 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 this invention.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," 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; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wire cutting machine, comprising a worktable assembly (1) and a bed arm (2) disposed on the worktable assembly (1), characterized in that: It also includes multiple sets of guide wheels (3) set in the bed arm (2) according to the installation requirements of molybdenum wire (4). The outer circumferential wall of the guide wheel (3) is provided with a guide wheel groove (5) for guiding the molybdenum wire (4). The front end face of the guide wheel (3) is rotatably provided with a pressing assembly for pressing the molybdenum wire (4). The pressing assembly includes a base plate and a pressure plate (6). The base plate is set on the outer side of the guide wheel (3). The base plate is provided with a groove (7) corresponding to the guide wheel groove (5). The pressure plate (6) is symmetrically distributed on both sides of the groove (7) and forms a rotatable connection with the base plate. The front side of the base plate is fixed with a side plate (10) forming a rotatable connection with the guide wheel (3). The guide wheel (3) is provided with a limiting member to restrict the rotation of the side plate (10). The guide wheel (3) has an annular groove (8) on its front end face. An internal gear ring (9) is rotatably provided in the annular groove (8). The side plate (10) is fixed on the internal gear ring (9). The internal gear ring (9) has internal teeth evenly provided on its inner circumference. The limiting member includes a pawl (12) rotatably provided in the annular groove (8) to limit the rotation of the internal gear ring (9) in one direction. The guide wheel (3) is provided with a cavity (14), and a main disk (15) is slidably provided in the cavity (14) along the axial direction of the guide wheel (3). The bottom of the guide wheel groove (5) is annularly open, and multiple sets of molybdenum wire guide grooves (16) are provided on the circumference of the main disk (15) along the axial direction. The main disk (15) includes an inner disk (151) and an outer disk (152). The outer disk (152) is rotatably mounted on the outer periphery of the inner disk (151) via a bearing (34). The molybdenum wire guide groove (16) is located on the outer periphery of the outer disk (152). A connecting spindle (17) is provided in the middle of the cavity (14). The inner disk (151) is sleeved on the connecting spindle (17) and forms a sliding connection with the connecting spindle (17). An internal hexagon bolt (18) is rotatably mounted on the guide wheel (3). The internal hexagon bolt (18) passes through the inner disk (151) and forms a threaded connection with the inner disk (151). A limiting rod (19) is provided on the inner periphery of the inner disk (151). A limiting groove (20) is provided on the periphery of the connecting spindle (17) for the limiting rod (19) to be inserted.

2. A limiting mechanism for a wire cutting machine, applied to the wire cutting machine of claim 1, characterized in that: The system includes a limiting wheel (21) rotatably mounted on the outer periphery of the guide wheel (3). The outer circumference of the guide wheel (3) is provided with a first tooth (22) on both the front and rear sides of the guide wheel groove (5). The limiting wheel (21) is provided with a second guide wheel groove (23) for guiding the molybdenum wire (4). The outer circumference of the limiting wheel (21) is provided with a second tooth (24) that meshes with the first tooth (22). The bed arm (2) is provided with a second limiting member for restricting the rotation of the limiting wheel (21).

3. The limiting mechanism of a wire cutting machine according to claim 2, characterized in that: The second limiting component includes a gear ring (25) fixed on the bed arm (2). The limiting wheel (21) is slidably disposed on the guide wheel (3) along the axial direction. After the limiting wheel (21) slides, the second tooth (24) meshes simultaneously with the inner tooth of the gear ring (25) and the first tooth (22) on the rear side of the guide wheel (3).

4. The limiting mechanism of a wire cutting machine according to claim 3, characterized in that: After the second tooth (24) slides and disengages from the inner teeth of the tooth ring (25) on the limiting wheel (21), it engages with the first tooth (22) on the front side of the guide wheel (3).

5. The limiting mechanism of a wire cutting machine according to claim 4, characterized in that: The guide wheel (3) has a first base shaft (26) at the center of its front end face, and the limit wheel (21) has a second base shaft (27) at the center of its front end face. A connecting plate (28) is connected between the first base shaft (26) and the second base shaft (27). The two ends of the connecting plate (28) are rotatably connected to the first base shaft (26) and the second base shaft (27) respectively. The connection between the connecting plate (28) and the first base shaft (26) is also slidably connected along the axial direction of the guide wheel (3).

6. The limiting mechanism of a wire cutting machine according to claim 5, characterized in that: The first base shaft (26) is provided with a second limiting groove (29). One side of the connecting plate (28) is inserted into the second limiting groove (29) and a rod is provided. The rod is located in the second limiting groove (29) and a limiting plate (30) is provided. The rod is located in the second limiting groove (29) and a spring (31) is sleeved on it. The spring (31) abuts against the limiting plate (30) and drives the limiting plate (30) to move along the bottom of the second limiting groove (29).

7. The limiting mechanism of a wire cutting machine according to claim 2, characterized in that: The limiting wheel (21) is provided with a second cavity (32), and a second main disk (33) is slidably provided in the second cavity (32) along the axial direction of the limiting wheel (21). The bottom of the second guide wheel groove (23) is annularly open. Multiple sets of second molybdenum wire guide grooves (40) are provided on the circumference of the second main disk (33) along the axial direction. The second main disk (33) includes a second inner disk (331) and a second outer disk (332). The second outer disk (332) is rotatably disposed on the outer circumference of the second inner disk (331) through a second bearing (35). The second molybdenum wire guide grooves (40) are disposed on the second outer disk (332). On the outer periphery, the second cavity (32) is provided with a second main shaft (36) in the middle. The second inner disk (331) is sleeved on the second main shaft (36) and forms a sliding connection with the second main shaft (36). The limiting wheel (21) is provided with a second internal hexagon bolt (37). The second internal hexagon bolt (37) passes through the second inner disk (331) and forms a threaded connection with the second inner disk (331). The inner periphery of the second inner disk (331) is provided with a second limiting rod (38). The periphery of the second main shaft (36) is provided with a third limiting groove (39) for the second limiting rod (38) to be inserted.

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