Plasma torch collision avoidance device

Abstract

The application relates to the technical field of cutting gun anti-collision, and discloses a plasma cutting gun anti-collision device, which comprises two vertical guide rails fixedly installed on a supporting surface, a transverse guide rail slidably installed on the two vertical guide rails, and a cutting seat slidably installed on the transverse guide rail. A linear motor lifting device is arranged on the cutting seat, a sliding piece is slidably installed on the linear motor lifting device, a fixed plate is fixedly installed on the sliding piece, and a cutting gun for cutting is slidably installed on the fixed plate. The cutting gun anti-collision device detects the flatness of a steel plate by using the contact between a ball and the surface of the steel plate. When the ball meets a protrusion, the ball drives a rotating cylinder, a sleeve and the cutting gun to move upwards, so that the first spring is further compressed. The cutting gun is prevented from colliding with the protrusion by rising. After passing the protrusion, the elastic force of the first spring makes the cutting gun fall back to the original position. The circumferential arrangement of the balls makes the balls around the cutting gun detect the protrusion, so that the cutting gun is prevented from colliding with the protrusion caused by the deformation of the steel plate.

Description

Technical Field

[0001] This invention relates to the field of anti-collision technology for cutting torches, specifically to an anti-collision device for plasma cutting torches. Background Technology

[0002] Plasma cutting torches, also known as plasma arc torches, are processing tools that use the heat of a high-temperature plasma arc to locally melt the metal at the workpiece's cut edge, and then use the momentum of high-speed plasma to expel the molten metal to form a kerf. Plasma cutting torches are usually used in conjunction with gantry CNC cutting machines. The structure of a gantry CNC cutting machine is similar to a transverse portal frame structure, using double-sided drive, and the plasma cutting torch is controlled by a CNC system to move along the X and Y axes along a preset path on fixed guide rails and transverse beams to complete the cutting task. Due to its advantages such as high cutting speed, high cutting accuracy, easy setting of cutting conditions, and ease of automation and unmanned operation, it is widely used in metal processing, machinery manufacturing, and other fields that require high-precision cutting.

[0003] Plasma cutting torches generate localized high temperatures in the steel plate during use, causing thermal expansion. This expansion can lead to changes in the steel plate's dimensions, and uneven temperature distribution can generate thermal stress. This stress can cause deformations such as bending and twisting. To ensure the plasma arc fully melts the steel plate and achieves a smooth and accurate cut, the plasma cutting torch typically needs to maintain a cutting distance of several millimeters from the steel plate during the cutting process. The torch is also controlled by CNC technology to move along a predetermined trajectory and height. When the steel plate deforms, the torch may collide with it, resulting in a decrease in cutting efficiency or even damage to the torch, potentially leading to safety accidents. Therefore, we propose a plasma cutting torch anti-collision device. Summary of the Invention

[0004] The purpose of this invention is to provide a plasma cutting torch anti-collision device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plasma cutting torch anti-collision device, comprising two vertical guide rails fixedly mounted on a support surface, a transverse guide rail slidably mounted on the two vertical guide rails, and a cutting seat slidably mounted on the transverse guide rail. A linear motor lifting device is provided on the cutting seat, a sliding component is slidably mounted on the linear motor lifting device, a fixed plate is fixedly mounted on the sliding component, a cutting torch for cutting is slidably mounted on the fixed plate, a sleeve is fixedly mounted on the cutting torch, the sleeve is located below the fixed plate, and a first spring is fixedly connected between the upper end of the sleeve and the lower end of the fixed plate. A limiting plate, limited by the fixed plate, is fixedly mounted on the cutting torch, the limiting plate is located above the fixed plate, and the first spring is always in a compressed state. A rotating cylinder is provided on the sleeve, and several connecting rods are fixedly mounted on the lower end of the rotating cylinder. Each connecting rod has a ball bearing at one end, and the ball bearings are all located below the cutting torch.

[0006] Preferably, a telescopic rod is fixedly installed on the sliding member, and a locking block for preventing the limiting plate from descending is fixedly installed at the end of the telescopic rod. A limiting rod is fixedly installed on the locking block. A cylinder is also fixedly installed on the sliding member, and a device block is fixedly installed at the output end of the cylinder. A limiting member that cooperates with the limiting rod is slidably installed on the device block.

[0007] Preferably, a pressure sensor for controlling the extension and retraction of the cylinder is fixedly installed on the fixed plate, a second magnetic block is slidably installed inside the card block, an elastic strip is fixedly connected between the second magnetic block and the inner wall of the card block, and a first magnetic block that is magnetically repelled by the second magnetic block is fixedly installed on the limiting plate.

[0008] Preferably, a first wedge block is slidably installed inside the device block, a second spring is fixedly connected between the first wedge block and the inner wall of the device block, and one side of the first wedge block is fixedly connected to one end of the limiting member. A second wedge block that cooperates with the first wedge block is also slidably installed inside the device block. A groove is provided on the fixing plate, and a third magnetic block for generating magnetic attraction force on the second wedge block is slidably installed in the groove.

[0009] Preferably, a slider is slidably installed in the groove, a third spring is fixedly connected between the slider and the third magnetic block, a slider rod is slidably installed on the slider, one end of the slider rod is located inside the slider and a fourth spring is fixedly connected between the slider rod and the inner wall of the slider, a guide groove for limiting the slider rod is provided on the fixed plate, a connecting plate is fixedly installed on one end of the slider rod, an insert rod is fixedly installed on the connecting plate, and a number of insertion holes for limiting the insert rod are provided on the fixed plate.

[0010] Preferably, the magnetic force generated by the third magnetic block on the second wedge block is greater than the elastic force of the second spring and the elastic force of the third spring.

[0011] Preferably, the magnetic repulsion force generated between the first magnetic block and the second magnetic block is greater than the elastic force of the elastic strip.

[0012] Preferably, the ball bearings are arranged in a circle around the cutting torch with the center line of the cutting torch as the central axis.

[0013] Preferably, a sensing plate for detecting the deformation of the steel plate is fixedly installed on the sliding member, and the sensing plate is located on the movement trajectory of the limiting plate.

[0014] Preferably, the rotating drum is sleeved on the sleeve, a threaded strip is fixedly installed on the inner wall of the rotating drum, and a threaded groove that mates with the threaded strip is provided on the outer wall of the sleeve.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention utilizes the contact between ball bearings and the surface of a steel plate to detect the flatness of the steel plate. When the ball bearings encounter a protrusion, they will drive the rotating cylinder, sleeve, and cutting torch to move upward, compressing the first spring. The cutting torch rises to prevent collision with the protrusion. After passing the protrusion, the elastic force of the first spring causes the cutting torch to descend and return to its original position. The circumferential arrangement of the ball bearings ensures that there are ball bearings around the cutting torch to detect protrusions, preventing the cutting torch from colliding with the deformed protrusions of the steel plate.

[0017] This invention utilizes a pressure sensor to control the extension and retraction of a cylinder, and controls the cylinder's extension time and length by the size of the protrusion. When the protrusion is small, the cylinder extends less, the limiting component will not cause the locking block to reset, the locking block will prevent the limiting plate from resetting, and the cutting torch will not directly reset downwards, preventing the ball bearings from colliding with the cutting torch as it descends after passing the protrusion. When the protrusion is large, the limiting component extends and causes the locking block to reset, and when the cutting torch resets, another ball bearing contacts the protrusion, preventing the cutting torch from colliding. This effectively prevents the cutting torch from failing to avoid small protrusions due to the ball bearings' detection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the cutting torch in this invention;

[0020] Figure 3 This is a schematic diagram of the structure of the limiting plate and the first spring in this invention;

[0021] Figure 4 This is a schematic diagram of the structure of the sleeve and the rotating cylinder in this invention;

[0022] Figure 5 This is a schematic diagram of the limiting plate in this invention;

[0023] Figure 6 This is a schematic diagram of the internal structure of the card block in this invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the device block in this invention;

[0025] Figure 8 This is a schematic diagram of the structure of the third magnetic block in this invention;

[0026] Figure 9 This is a schematic diagram of the internal structure of the slider in this invention.

[0027] In the diagram: 1. Vertical guide rail; 2. Horizontal guide rail; 3. Cutting seat; 4. Linear motor lifting device; 5. Sliding component; 6. Fixed plate; 7. Cutting torch; 8. Limiting plate; 9. Sleeve; 10. Threaded groove; 11. First spring; 12. Rotary drum; 13. Threaded strip; 14. Connecting rod; 15. Ball bearing; 16. Sensing plate; 17. First magnetic block; 18. Pressure sensing element; 19. Telescopic rod; 20. Locking block; 21. Second magnetic block; 22. Elastic strip; 23. Limiting rod; 24. Limiting component; 25. Cylinder; 26. Device block; 27. Second wedge block; 28. First wedge block; 29. ​​Second spring; 30. Slide groove; 31. Third magnetic block; 32. Third spring; 33. Sliding block; 34. Fourth spring; 35. Slide rod; 36. Guide groove; 37. Connecting plate; 38. Insert rod; 39. Insertion hole. Detailed Implementation

[0028] 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.

[0029] Please see Figures 1-9This invention provides a technical solution: a plasma cutting torch anti-collision device, comprising two vertical guide rails 1 fixedly mounted on a support surface, a horizontal guide rail 2 slidably mounted on the two vertical guide rails 1, and a cutting seat 3 slidably mounted on the horizontal guide rail 2. The cutting seat 3 is equipped with a linear motor lifting device 4 (the linear motor lifting device 4 is a known existing structure; for specific models, please refer to Siemens 1FN3, therefore it will not be described in detail here). A sliding member 5 is slidably mounted on the linear motor lifting device 4, a fixed plate 6 is fixedly mounted on the sliding member 5, and a cutting torch 7 for cutting is slidably mounted on the fixed plate 6. The linear motor lifting device 4 controls the sliding member 5 to drive the fixed plate 6 and the cutting torch 7 to move up and down, thereby... The cutting torch 7 can be adjusted to different heights when cutting different steel plates. Then, CNC technology controls the movement of the horizontal guide rail 2 on the vertical guide rail 1, and the movement of the cutting seat 3 on the horizontal guide rail 2, so that the cutting torch 7 cuts the steel plate according to a preset trajectory. A sleeve 9 is fixedly installed on the cutting torch 7, located below the fixed plate 6, and a first spring 11 is fixedly connected between the upper end of the sleeve 9 and the lower end of the fixed plate 6. A limiting plate 8, limited by the fixed plate 6, is fixedly installed on the cutting torch 7, located above the fixed plate 6, and the first spring 11 is always in a compressed state. A rotating cylinder 12 is sleeved on the sleeve 9, and a threaded strip 13 is fixedly installed on the inner wall of the rotating cylinder 12. The outer wall of the sleeve 9 is provided with a threaded groove 10 that mates with the threaded strip 13. Several connecting rods 14 are fixedly installed at the lower end of the 12, and each connecting rod 14 has a ball bearing 15 at one end. The ball bearings 15 are all located below the cutting torch 7 and are arranged in a circle around the centerline of the cutting torch 7. When the height of the cutting torch 7 is adjusted according to different steel plates, the rotating drum 12 can be rotated. Through the cooperation of the threaded strip 13 and the threaded groove 10, the rotating drum 12 drives the connecting rods 14 and the ball bearings 15 to move up and down during rotation, so that the ball bearings 15 are always in contact with the surface of the steel plate. Since the first spring 11 is always in a compressed state and the limiting plate 8 is limited by the fixing plate 6, the cutting torch 7 is fixed to the fixing plate 6. If the cutting torch 7 encounters the deformation area of ​​the steel plate during the cutting process, the protrusion of the steel plate can cause the ball bearings 15 to be pulled. The moving connecting rod 14 and the rotating drum 12 move upward. Through the threaded groove 10, the threaded bar 13 is limited. The rotating drum 12 will drive the sleeve 9, the cutting torch 7, and the limiting plate 8 to move upward, so that the first spring 11 is further compressed. The lower end of the cutting torch 7 rises to avoid the protrusion of the steel plate, so as to prevent the cutting torch 7 from colliding during the cutting process. After the cutting torch 7 passes the protrusion of the steel plate, the elastic force of the first spring 11 causes the cutting torch 7 to fall down and reset, and the ball bearings 15 re-contact the surface of the steel plate. Since the ball bearings 15 are arranged in a circle around the cutting torch 7 with the center line of the cutting torch 7 as the axis, no matter what angle the rotating drum 12 rotates to, there are always ball bearings 15 around the cutting torch 7 to detect the flatness of the steel plate, so as to prevent the cutting torch 7 from colliding with the protrusion of the steel plate during the movement.A sensing plate 16 for detecting whether the deformation of the steel plate exceeds the safety range is fixedly installed on the sliding component 5. The sensing plate 16 is located on the movement trajectory of the limiting plate 8. When the deformation of the steel plate exceeds a certain safety level, the limiting plate 8 rises significantly and contacts the sensing plate 16. After being sensed, the sensing plate 16 stops the cutting torch 7 and ceases cutting. The cutting work resumes after the operator completes the maintenance.

[0030] A telescopic rod 19 is fixedly installed on the sliding member 5. A locking block 20 for preventing the limiting plate 8 from descending is fixedly installed at the end of the telescopic rod 19. A second magnetic block 21 is slidably installed inside the locking block 20. An elastic strip 22 is fixedly connected between the second magnetic block 21 and the inner wall of the locking block 20. A first magnetic block 17 that is magnetically repulsive to the second magnetic block 21 is fixedly installed on the limiting plate 8. The magnetic repulsion force generated between the first magnetic block 17 and the second magnetic block 21 is greater than the elastic force of the elastic strip 22. A limiting rod 23 is fixedly installed on the locking block 20. A cylinder 25 is also fixedly installed on the sliding member 5. A device block 26 is fixedly installed at the output end of the cylinder 25. A limiting member 24 that cooperates with the limiting rod 23 is slidably installed on the device block 26. A device for controlling the extension and retraction of the cylinder 25 is fixedly installed on the fixing plate 6. The pressure sensor 18; when the pressure sensor 18 senses pressure, the cylinder 25 contracts; if the pressure sensor 18 is no longer under pressure, the cylinder 25 extends at a constant speed. A first wedge block 28 is slidably installed inside the device block 26. A second spring 29 is fixedly connected between the first wedge block 28 and the inner wall of the device block 26, and one side of the first wedge block 28 is fixedly connected to one end of the limiting member 24. A second wedge block 27 that cooperates with the first wedge block 28 is also slidably installed inside the device block 26. A groove 30 is provided on the fixing plate 6. A third magnetic block 31 for generating magnetic attraction force on the second wedge block 27 is slidably installed inside the groove 30. A slider 33 is slidably installed inside the groove 30. A third spring 32 is fixedly connected between the slider 33 and the third magnetic block 31. The magnetic force generated by the second wedge block 27 is greater than the elastic force of the second spring 29 and the elastic force of the third spring 32. In the initial state, the limiting plate 8 and the locking block 20 are on the same horizontal plane, the telescopic rod 19 is in a compressed state, the limiting plate 8 blocks the locking block 20, and the locking block 20 will not move below the limiting plate 8. When the ball bearing 15 detects a small protrusion that is not enough to collide with the cutting torch 7, the limiting plate 8 moves upward a short distance and will not move above the locking block 20 to extend the locking block 20. If the protrusion is large and may collide with the cutting torch 7, the limiting plate 8 will rise above the locking block 20, and the locking block 20 will be pushed downward by the telescopic rod 19. At the same time, the pressure sensor 18 no longer senses pressure and controls the cylinder 25 to push the device block at a constant speed. 26. If the protrusion is large enough, the rising time of the limiting plate 8 will be longer, and the extension length of the cylinder 25 will be long enough to allow the device block 26 to pass the third magnetic block 31. Since the magnetic force generated by the third magnetic block 31 on the second wedge block 27 is greater than the elastic force of the second spring 29, when the device block 26 passes the third magnetic block 31, the second wedge block 27 will be attracted downward by the magnetic force of the third magnetic block 31. Through the cooperation between the inclined surface of the second wedge block 27 and the inclined surface of the first wedge block 28, the first wedge block 28 will push the limiting member 24 towards the limiting rod 23. Since the magnetic force generated by the third magnetic block 31 on the second wedge block 27 is greater than the elastic force of the third spring 32, after the second wedge block 27 descends, the device block 26 will contact the third magnetic block 31, and the magnetic force will increase the friction between them.Device block 26 can drive the third magnetic block 31 to move synchronously against the elastic force of the third spring 32, and cause the first wedge block 28 to drive the limiting member 24 to remain extended. When the ball 15 passes the protrusion, the limiting plate 8 will be retracted by the elastic force of the first spring 11. Due to the obstruction of the locking block 20, the limiting plate 8 cannot be directly reset, maintaining a certain height, and clamping the locking block 20 between the limiting plate 8 and the fixing plate 6. At this time, since the magnetic repulsion force generated between the first magnetic block 17 and the second magnetic block 21 is greater than the elastic force of the elastic strip 22, the second magnetic block 21 is repelled by the first magnetic block 17. The force causes the elastic strip 22 to deform, and the pressure sensor 18 senses the pressure, causing the cylinder 25 to retract. If the protrusion is small, the cylinder 25 extends for a short time, and the device block 26 has not passed the third magnetic block 31. Therefore, the limiting member 24 will not extend, and the limiting rod 23 will not appear on the movement trajectory of the limiting member 24. After the cylinder 25 drives the device block 26 to reset, the limiting rod 23 will not drive the locking block 20 to retract. The locking block 20 will continue to lock the limiting plate 8, hindering the cutting torch 7 from descending and resetting. Because the protrusion is small, the ball bearing 15 may have passed the protrusion before the cutting torch 7 has passed it. Direct reset may collide with the protrusion. After the locking block 20 locks the limiting plate 8, it can be manually checked to ensure that the cutting torch 7 passes the protrusion before descending. If the protrusion is large, the cylinder 25 will extend for a sufficiently long time. At this time, the device block 26 will drive the third magnetic block 31 to retract synchronously, and the limiting member 24 will remain in the extended state. During the retraction process, the limiting rod 23 will be located on the movement trajectory of the limiting member 24. During the reset process of the device block 26 driving the limiting member 24, the limiting rod 23 will also drive the locking block 20 to retract again, and the telescopic rod 19 will return to the retracted state. When the device block 26... When the retraction of block 6 is about to be completed, the third magnetic block 31 will move to the end of the slide groove 30 and stop moving. After the device block 26 has retracted, it will separate from the third magnetic block 31. The third spring 32 will drive the third magnetic block 31 to reset, while the second spring 29 will drive the first wedge block 28 and the limiting member 24 to reset, and also reset the second wedge block 27. After the locking block 20 retracts, the limiting plate 8 can also drive the cutting torch 7 to reset. Because the protrusion is large, when the cutting torch 7 resets after the first ball 15 has passed, another ball 15 will contact the protrusion first, and after another check, the cutting torch 7 will be completely reset.

[0031] A sliding rod 35 is slidably mounted on the slider 33. One end of the sliding rod 35 is located inside the slider 33 and is fixedly connected to the inner wall of the slider 33 by a fourth spring 34. A guide groove 36 for limiting the sliding rod 35 is provided on the fixing plate 6. A connecting plate 37 is fixedly mounted on one end of the sliding rod 35. An insert rod 38 is fixedly mounted on the connecting plate 37. Several insertion holes 39 for limiting the insertion rod 38 are provided on the fixing plate 6. By pulling the connecting plate 37, the insert rod 38 is pulled out of the insertion hole 39, and the sliding rod 35 moves outward from the slider 33. The fourth spring 34 is stretched. Through the limiting of the sliding rod 35 by the guide groove 36 and the limiting of the slider 33 by the sliding groove 30, the sliding connecting plate 37 causes the slider 33 to drive the third magnetic block 31 to move. The elastic force of the third spring 32 keeps the slider 33 and the third magnetic block 31 at a certain distance. According to the cutting speed of the cutting torch 7, After the connecting plate 37 is moved to the appropriate position, it is released. The elastic force of the fourth spring 34 causes the slide bar 35 to move back into the slider 33, and the connecting plate 37 drives the insertion rod 38 to move into the corresponding insertion hole 39, so that the slider 33 is fixed in the slide groove 30. The position of the third magnetic block 31 can also be changed accordingly. If the cutting speed of the cutting torch 7 is faster, the speed of the ball 15 when passing through the same size protrusion is faster and the time is shorter. Since the extension speed of the cylinder 25 is always consistent, the initial position of the third magnetic block 31 is closer to the device block 26, so that the device block 26 can contact the third magnetic block 31 with a shorter distance. If the cutting speed of the cutting torch 7 is slower, the slider 33 can be moved in the opposite direction, so that the initial position of the third magnetic block 31 is farther from the device block 26. The distance between the device block 26 and the third magnetic block 31 can be effectively adjusted according to the moving speed of the cutting torch 7.

[0032] Specifically, firstly, the linear motor lifting device 4 controls the sliding component 5 to drive the fixed plate 6 and the cutting torch 7 to move up and down, allowing the cutting torch 7 to be adjusted to different heights when cutting different steel plates. Then, CNC technology controls the horizontal guide rail 2 to move on the vertical guide rail 1, and the cutting seat 3 to move on the horizontal guide rail 2, so that the cutting torch 7 cuts the steel plate according to the preset trajectory. If the cutting torch 7 encounters a deformation area of ​​the steel plate during the cutting process, the protruding position of the steel plate can cause the ball bearing 15 to drive the connecting rod 14 and the rotating drum 12 to move upward. Through the thread groove 10 limiting the threaded strip 13, the rotating drum 12 will drive the sleeve 9, the cutting torch 7, and the limiting plate 8 to move upward, so that the first spring 11 is further compressed, and the lower end of the cutting torch 7 rises to avoid the protruding part of the steel plate, preventing the cutting torch 7 from... During the cutting process, a collision occurs. After the cutting torch 7 passes the protrusion on the steel plate, the elastic force of the first spring 11 causes the cutting torch 7 to descend and reset, and the ball bearing 15 to re-contact the steel plate surface. When the ball bearing 15 detects a small protrusion that is insufficient to collide with the cutting torch 7, the limiting plate 8 rises a short distance and will not move above the locking block 20 to extend it. If the protrusion is large and may collide with the cutting torch 7, the limiting plate 8 will rise above the locking block 20, and the locking block 20 will be pushed downwards by the telescopic rod 19. At the same time, the pressure sensor 18 no longer senses pressure and controls the cylinder 25 to push the device block 26 at a constant speed. If the protrusion is large enough, the limiting plate 8 will rise for a longer time, and the cylinder 25 will extend a longer distance, allowing the device block 26 to pass the third... Because the magnetic force generated by the third magnetic block 31 on the second wedge block 27 is greater than the elastic force of the second spring 29, when the device block 26 passes the third magnetic block 31, the second wedge block 27 will be attracted downward by the magnetic force of the third magnetic block 31. Through the cooperation between the inclined surface of the second wedge block 27 and the inclined surface of the first wedge block 28, the first wedge block 28 will push the limiting member 24 towards the limiting rod 23. Because the magnetic force generated by the third magnetic block 31 on the second wedge block 27 is greater than the elastic force of the third spring 32, after the second wedge block 27 descends, the device block 26 contacts the third magnetic block 31. The magnetic force increases the friction between them, and the device block 26 can drive the third magnetic block 31 to overcome the elastic force of the third spring 32 and move synchronously, and cause the first wedge block 28 to move towards the limiting rod 23. When component 24 remains extended, after ball 15 passes the protrusion, the limiting plate 8 retracts due to the elastic force of the first spring 11. Because of the obstruction of the locking block 20, the limiting plate 8 cannot directly reset and will maintain a certain height, clamping the locking block 20 between the limiting plate 8 and the fixing plate 6. At this time, because the magnetic repulsion force generated between the first magnetic block 17 and the second magnetic block 21 is greater than the elastic force of the elastic strip 22, the second magnetic block 21 is subjected to the repulsion force of the first magnetic block 17, causing the elastic strip 22 to deform. This causes the pressure sensor 18 to sense the pressure, causing the cylinder 25 to retract. If the protrusion is small, the cylinder 25 extends for a short time, and the device block 26 does not pass the third magnetic block 31. Therefore, the limiting component 24 will not extend, and the limiting rod 23 will not appear on the movement trajectory of the limiting component 24.After cylinder 25 drives device block 26 to reset, limit rod 23 will not drive latch block 20 to retract. Latch block 20 will continue to hold limit plate 8, preventing cutter 7 from descending and resetting. If the protrusion is small, ball bearing 15 may pass the protrusion before cutter 7 has passed it. Direct reset of cutter 7 may cause collision with the protrusion. After latch block 20 holds limit plate 8, manual inspection is required to ensure that cutter 7 has passed the protrusion before descending. If the protrusion is large, cylinder 25 will extend for a sufficiently long time. Device block 26 will then drive third magnetic block 31 to retract synchronously, and limit member 24 will remain extended. During the retraction process, limit rod 23 will be located on the movement trajectory of limit member 24. Device block 26 drives limit member 24 to retract. During the positioning process, the limiting rod 23 causes the locking block 20 to retract again, and the telescopic rod 19 returns to the retracted state. When the device block 26 is about to retract completely, the third magnetic block 31 will move to the end of the slide groove 30 and stop moving. After the device block 26 retracts completely, it will separate from the third magnetic block 31. The third spring 32 drives the third magnetic block 31 to reset, while the second spring 29 drives the first wedge block 28 and the limiting member 24 to reset, and also resets the second wedge block 27. After the locking block 20 retracts, the limiting plate 8 can also drive the cutting torch 7 to reset. Because the protrusion is large, when the first ball 15 passes by, when the cutting torch 7 resets, another ball 15 will contact the protrusion first and perform a detection before the cutting torch 7 is fully reset.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can 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 plasma cutting torch anti-collision device, comprising two vertical guide rails (1) fixedly mounted on a support surface, a transverse guide rail (2) slidably mounted on the two vertical guide rails (1), and a cutting seat (3) slidably mounted on the transverse guide rail (2), characterized in that: A linear motor lifting device (4) is provided on the cutting seat (3). A sliding part (5) is slidably installed on the linear motor lifting device (4). A fixed plate (6) is fixedly installed on the sliding part (5). A cutting torch (7) for cutting is slidably installed on the fixed plate (6). A sleeve (9) is fixedly installed on the cutting torch (7). The sleeve (9) is located below the fixed plate (6). A first spring (11) is fixedly connected between the upper end of the sleeve (9) and the lower end of the fixed plate (6). A limiting plate (8) limited by the fixed plate (6) is fixedly installed on the cutting torch (7). The limiting plate (8) is located above the fixed plate (6). The first spring (11) is always in a compressed state. A rotating cylinder (12) is provided on the sleeve (9). Several connecting rods (14) are fixedly installed at the lower end of the rotating cylinder (12). A ball (15) is provided at one end of each connecting rod (14). The ball (15) is located below the cutting torch (7). A telescopic rod (19) is fixedly installed on the sliding member (5). A locking block (20) for preventing the limiting plate (8) from descending is fixedly installed at the end of the telescopic rod (19). A limiting rod (23) is fixedly installed on the locking block (20). A cylinder (25) is also fixedly installed on the sliding member (5). A device block (26) is fixedly installed at the output end of the cylinder (25). A limiting member (24) that cooperates with the limiting rod (23) is slidably installed on the device block (26). A pressure sensor (18) for controlling the extension and retraction of the cylinder (25) is fixedly installed on the fixed plate (6). A second magnetic block (21) is slidably installed inside the locking block (20). An elastic strip (22) is fixedly connected between the second magnetic block (21) and the inner wall of the locking block (20). A first magnetic block (17) that is magnetically repelled by the second magnetic block (21) is fixedly installed on the limiting plate (8).

2. The anti-collision device for a plasma cutting torch according to claim 1, characterized in that: A first wedge block (28) is slidably installed inside the device block (26). A second spring (29) is fixedly connected between the first wedge block (28) and the inner wall of the device block (26). One side of the first wedge block (28) is fixedly connected to one end of the limiting member (24). A second wedge block (27) that cooperates with the first wedge block (28) is also slidably installed inside the device block (26). A groove (30) is provided on the fixing plate (6). A third magnetic block (31) for generating magnetic attraction force on the second wedge block (27) is slidably installed inside the groove (30).

3. The anti-collision device for a plasma cutting torch according to claim 2, characterized in that: A slider (33) is slidably installed in the groove (30). A third spring (32) is fixedly connected between the slider (33) and the third magnetic block (31). A slider rod (35) is slidably installed on the slider (33). One end of the slider rod (35) is located inside the slider (33) and a fourth spring (34) is fixedly connected between the slider rod (33) and the inner wall of the slider (33). A guide groove (36) for limiting the slider rod (35) is provided on the fixing plate (6). A connecting plate (37) is fixedly installed on one end of the slider rod (35). A plug rod (38) is fixedly installed on the connecting plate (37). Several plug holes (39) for limiting the plug rod (38) are provided on the fixing plate (6).

4. The anti-collision device for a plasma cutting torch according to claim 3, characterized in that: The magnetic force generated by the third magnetic block (31) on the second wedge block (27) is greater than the elastic force of the second spring (29) and the elastic force of the third spring (32).

5. The anti-collision device for a plasma cutting torch according to claim 1, characterized in that: The magnetic repulsion between the first magnetic block (17) and the second magnetic block (21) is greater than the elastic force of the elastic strip (22).

6. The anti-collision device for a plasma cutting torch according to claim 1, characterized in that: The ball bearings (15) are arranged in a circle around the center line of the cutting gun (7).

7. The anti-collision device for a plasma cutting torch according to claim 1, characterized in that: A sensor plate (16) for detecting the deformation of the steel plate is fixedly installed on the sliding member (5). The sensor plate (16) is located on the movement trajectory of the limiting plate (8).

8. The anti-collision device for a plasma cutting torch according to claim 1, characterized in that: The rotating drum (12) is fitted onto the sleeve (9). A threaded strip (13) is fixedly installed on the inner wall of the rotating drum (12), and a threaded groove (10) that mates with the threaded strip (13) is provided on the outer wall of the sleeve (9).

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