Numerical control cutting machine and control method thereof

Abstract

The application belongs to the technical field of laser cutting and relates to a numerical control cutting machine, which comprises a machine tool, a motorized turntable is rotatably arranged in the machine tool, a sliding block is slidably arranged on one side of the motorized turntable along the axial direction of the motorized turntable, a fixed cylinder is slidably arranged in the middle of the sliding block, a connecting column is fixedly connected to one end of the fixed cylinder close to the middle of the motorized turntable, an electric telescopic rod is connected between the connecting column and the sliding block, a curved channel in the shape of an arc is formed in the connecting column at the end of the fixed cylinder and is in communication with the inner cavity of the fixed cylinder, a metal sleeve is slidably arranged in the curved channel, a metal hose is slidably arranged in the metal sleeve, a gas pump is slidably arranged in the fixed cylinder, and the suction end of the gas pump is fixedly communicated with one end of the metal hose. The application has the advantages that the metal sleeve can receive the high-temperature molten material generated by the pipe during the laser cutting process, the molten material is prevented from directly dropping to the inner wall of the pipe, and the quality of the pipe is improved.

Description

Technical Field

[0001] This invention belongs to the field of laser cutting technology and relates to a CNC cutting machine and its control method. Background Technology

[0002] Laser cutting technology has been widely used in the processing and manufacturing of pipe fittings due to its advantages such as high cutting precision, small heat-affected zone, and non-contact processing. In pipe fitting processing, it is often necessary to cut off the ends of the pipe fittings, such as cutting open the closed end of a tee or elbow fitting to form a complete pipe structure.

[0003] When existing cutting machines use laser cutting for pipes, the high temperature causes the pipes to melt instantly, producing a large amount of molten material. This molten material drips onto the inner wall of the pipe below under the influence of gravity. After cooling, the molten material forms hard and difficult-to-remove slag, which seriously affects the internal quality of the workpiece and its subsequent performance.

[0004] Furthermore, during the pipe cutting process, the cut-off scrap segment is only connected to the main workpiece by tiny connection points at the end of the cutting process. At this point, under its own gravity, the scrap segment often shifts or sags relative to the workpiece before it is completely melted. Laser cutting can no longer achieve final separation through melting; instead, the weight of the scrap segment tears apart the tiny connection points. This tearing behavior creates irregular protrusions, pits, burrs, or sharp edges on the cut edge of the workpiece, severely affecting the cut quality and even causing the workpiece to fail to meet usage requirements.

[0005] To address the above problems, this invention proposes a CNC cutting machine and its control method. Summary of the Invention

[0006] To address the problems existing in the background art, the present invention proposes a CNC cutting machine and its control method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A CNC cutting machine includes a machine tool, an electric turntable is rotatably installed inside the machine tool, a sliding block is slidably arranged on one side of the electric turntable along its axial direction, a fixed cylinder is slidably passed through the middle of the sliding block, a connecting column is fixedly connected to one end of the fixed cylinder near the middle of the electric turntable, and an electric telescopic rod is connected between the connecting column and the sliding block. The connecting column has an arc-shaped curved channel at the end of the fixed cylinder that communicates with the inner cavity of the fixed cylinder. A metal sleeve is slidably disposed inside the curved channel. A clamping component for fixing the metal sleeve is provided at the end of the curved channel away from the fixed cylinder. A metal hose is slidably disposed inside the metal sleeve, and an air pump is slidably disposed inside the fixed cylinder. The air pump's suction end is fixedly connected to one end of the metal hose. The electric turntable has a detachable T-shaped pipe fitting in the middle, and the connecting post can be inserted into the pipe fitting. One end of the metal sleeve is fixedly provided with a rubber layer, and one side of the rubber layer abuts against the closed end inside the pipe fitting. A laser cutter is provided at the top of the machine tool, and the laser cutter is located above the pipe fitting.

[0008] Furthermore, a fixed ring is fixedly installed inside the machine tool, and two support rods are symmetrically fixedly connected to the bottom end of the fixed ring. The bottom ends of the two support rods are fixedly connected to the bottom surface inside the machine tool, and the electric turntable is coaxially rotatably installed inside the fixed ring.

[0009] Furthermore, the electric turntable has a through hole in the middle, and the closed end branch of the pipe fitting is movably disposed in the through hole. Two positioning plates are symmetrically fixedly connected to the through hole on one side of the electric turntable. The side of the two positioning plates that are close to each other is coplanar with the inner wall of the through hole. The other two open branches of the pipe fitting are respectively movably disposed on one side of the two positioning plates. The positioning plate is V-shaped on the side away from the electric turntable, and the V-shaped surface of the positioning plate gradually tilts towards the side closer to the electric turntable from both ends to the middle.

[0010] Furthermore, a pneumatic chuck is fixedly installed in the middle of the electric turntable. The placement hole in the middle of the pneumatic chuck corresponds to the through hole. The ends of the multiple jaws on the pneumatic chuck that are close to each other are movably abutting against the outer surface of the pipe. The jaws on the pneumatic chuck are located on the side of the electric turntable away from the positioning plate.

[0011] Furthermore, an electric slide rail is fixedly installed on one side of the electric turntable, and the bottom end of the sliding block is fixedly connected to the sliding end of the electric slide rail.

[0012] Furthermore, two electric telescopic rods are provided, and the two electric telescopic rods are symmetrically fixed through the sliding block. The fixed cylinder is located between the two electric telescopic rods, and the sliding direction of the fixed cylinder is perpendicular to the sliding direction of the sliding block. The connecting column is fixedly connected to the telescopic ends of the two electric telescopic rods.

[0013] Furthermore, two clamping assemblies are provided, and the two clamping assemblies are symmetrical about the ends of the curved channel; The clamping assembly includes a clamping plate and an electric push rod. Two first mounting slots are symmetrically opened at the end of the curved channel inside the connecting column. The two electric push rods are fixedly installed in the two first mounting slots respectively. The clamping plate is fixedly connected to the end of the telescopic end of the electric push rod. The side of the two clamping plates that are close to each other is movably abutting against the outer surface of the metal sleeve.

[0014] Furthermore, one end of the metal sleeve is coaxially fixedly connected to a first end plate, one end of the metal hose is fixedly connected to one side of the first end plate, and the rubber layer is fixedly connected to the other side of the first end plate. The other end of the metal sleeve is fixedly connected to a second end plate, and the other end of the metal hose is fixedly passed through the second end plate.

[0015] Furthermore, several second mounting slots are evenly provided in the connecting column at one end of the curved channel near the fixed cylinder. Each second mounting slot is equipped with a first hub motor. Each wheel of the first hub motor is fixedly fitted with a first rubber wheel. The outer surface of each first rubber wheel is movably abutting against the outer surface of the metal sleeve. The air pump has several third mounting slots evenly distributed on its outer surface. Each third mounting slot is equipped with a second hub motor. Each second hub motor has a second rubber wheel fixedly fitted on its wheel. The outer surface of each second rubber wheel is movably abutting against the inner wall of the fixed cylinder.

[0016] A control method for a CNC cutting machine, using the CNC cutting machine as described above, includes the following steps: S1. Move the pipe fitting into the through hole of the electric turntable, with the closed end of the pipe fitting located on the side of the electric turntable away from the positioning plate. Operate the pneumatic chuck to fix the pipe fitting. After fixing, the closed end branch of the pipe fitting is coaxial with the through hole. S2. Drive the connecting column into the pipe fitting by means of an electric telescopic rod until the channel opening at the end of the curved channel away from the fixed cylinder is coaxial with the through hole; S3. Start the first hub motor and the second hub motor, and deform the metal sleeve and the metal hose together by passing them through the curved channel. After passing through the curved channel, the metal sleeve returns to a straight shape, and the metal hose deforms together with the metal sleeve until the rubber layer abuts against the inner wall of the closed end of the fitting. S4. Operate the two electric push rods to make the two clamping plates cooperate to clamp and fix the metal sleeve; S5. Start the second hub motor and drive the air pump to move away from the connecting column. The air pump applies axial compressive stress to the metal sleeve through the metal hose and the second end plate to make it obtain bending stiffness, so that the straight metal sleeve located at the closed end of the pipe can support the closed end of the pipe. S6. Start the air pump to draw air from the metal hose, so that the rubber layer has suction force on the closed end of the fitting, and fix the closed end of the fitting. S7. Start the laser cutter and control the electric turntable to rotate to cut the pipe. The molten slag produced by the cutting falls onto the surface of the metal sleeve. At the same time, the cut metal sleeve will not fall off due to the fixation of the closed end of the pipe. S8. After cutting, release the adsorption and compressive stress, control the metal sleeve to retract into the fixed cylinder, and scrape off the slag attached to the surface of the metal sleeve by the end of the curved channel during the retraction process.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This CNC cutting machine slides a metal sleeve through a curved channel, allowing the metal sleeve to extend into the closed end branch of the pipe fitting. The metal sleeve can absorb the high-temperature molten material generated during laser cutting, reducing the direct dripping of molten material onto the inner wall of the pipe fitting and improving the quality of the pipe fitting.

[0018] 2. This CNC cutting machine, through the combination of clamping components, air pump and metal hose, can apply axial compressive stress to the metal sleeve to make it have bending stiffness, and at the same time generate an adsorption and fixing effect on the closed end of the pipe. At the end of the cutting, the waste section is always stably supported and fixed, and will not shift or sag due to gravity. This allows the cut to be completely melted and cut by laser energy, reducing the generation of burrs, protrusions or sharp edges, and improving the smoothness and uniformity of the cut.

[0019] 3. In this CNC cutting machine, the metal sleeve needs to pass through the end of the curved channel again during the process of retracting it to the fixed cylinder after cutting. This allows the end of the curved channel to scrape off the solidified slag on the surface of the metal sleeve, thus achieving automatic cleaning of the metal sleeve and preparing it for the next cutting process. This is suitable for continuous production. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure of the fixing ring in this invention; Figure 3 This is a schematic diagram of the structure in this invention where the pipe fitting is fixed on the electric turntable; Figure 4 yes Figure 3 A sectional view; Figure 5 yes Figure 4 A magnified view of a portion of the image; Figure 6 This is a schematic diagram of the structure in which the metal sleeve is located inside the fixed cylinder in this invention; Figure 7 yes Figure 6 A sectional view; Figure 8 This is a schematic diagram of the metal sleeve in this invention.

[0021] In the diagram: 1. Machine tool; 2. Laser cutter; 3. Fixing ring; 4. Electric turntable; 5. Pneumatic chuck; 6. Positioning plate; 7. Electric slide rail; 8. Sliding block; 9. Electric telescopic rod; 10. Connecting column; 11. Bending channel; 12. Fixing cylinder; 13. Metal sleeve; 14. First end plate; 15. Rubber layer; 16. Second end plate; 17. First hub motor; 18. Electric push rod; 19. Clamping plate; 20. Metal hose; 21. Air pump; 22. Second hub motor; 23. Pipe fitting. Detailed Implementation

[0022] 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.

[0023] like Figures 1-8 As shown, the technical solution adopted by the present invention is as follows: A CNC cutting machine includes a machine tool 1, and an electric turntable 4 is rotatably installed inside the machine tool 1.

[0024] A fixed ring 3 is fixedly installed inside the machine tool 1, with its axis arranged horizontally. Two support rods are symmetrically fixedly connected to the bottom end of the fixed ring 3, and the bottom ends of the two support rods are fixedly connected to the bottom surface inside the machine tool 1. The electric rotary table 4 is coaxially and rotatably installed inside the fixed ring 3. The fixed ring 3 provides installation space for the electric rotary table 4 to ensure the operational stability of the electric rotary table 4.

[0025] The electric turntable 4 mainly consists of an electric motor, a reducer, a turntable platform, bearings, and a control system. The principle can be simply summarized as the electric motor driving the turntable platform to rotate. Electric turntables are commonly used in scenarios such as dining tables and product displays, and are an existing product.

[0026] The electric turntable 4 has a through hole in the middle. A tee fitting 23 is detachably installed in the middle of the electric turntable 4, and the closed end branch of the fitting 23 is movably set in the through hole.

[0027] Two positioning plates 6 are symmetrically fixedly connected to the through hole on one side of the electric turntable 4. The sides of the two positioning plates 6 that are close to each other are coplanar with the inner wall of the through hole. The closed end branch of the pipe fitting 23 passes through the through hole and passes between the two positioning plates 6. The other two open branches of the pipe fitting 23 are respectively movably set on one side of the two positioning plates 6. The design of the two positioning plates 6 and the through hole is adapted to the shape of the tee pipe, so that the closed end of the pipe fitting 23 that needs to be cut can extend to one side of the electric turntable 4, thereby facilitating subsequent cutting.

[0028] The positioning plate 6 is V-shaped on the side away from the electric turntable 4, and the V-shaped surface of the positioning plate 6 gradually slopes towards the side closer to the electric turntable 4 from both ends to the middle. The V-shaped design enables the positioning plate 6 to have an automatic centering and guiding function, eliminating the need for repeated manual calibration when placing the pipe fitting 23 and improving work efficiency.

[0029] A pneumatic chuck 5 is fixedly installed in the middle of the electric turntable 4, with the placement hole in the middle of the pneumatic chuck 5 corresponding to the through hole. The ends of the multiple jaws on the pneumatic chuck 5 that are close together movably abut against the outer surface of the pipe fitting 23. The jaws on the pneumatic chuck 5 are located on the side of the electric turntable 4 away from the positioning plate 6. The pneumatic chuck 5 adopts a multi-jaw self-centering structure, and the clamping force can be steplessly adjusted by an external air pressure valve. Anti-slip and wear-resistant rubber pads are pasted on the inner side of the jaws, which increases the clamping friction and prevents the jaws from scratching the outer surface of the pipe fitting 23. When the jaws on the pneumatic chuck 5 clamp the pipe fitting 23, the closed end branch of the pipe fitting 23 located in the through hole is concentric with the through hole.

[0030] The pneumatic chuck 5, also known as a pneumatic collet, is a type of power chuck in the field of mechanical engineering. It belongs to the category of pneumatically driven machine tool fixtures and is an existing product.

[0031] A sliding block 8 is slidably provided on one side of the electric turntable 4 along its axial direction.

[0032] An electric slide rail 7 is fixedly installed on one side of the electric turntable 4, and the bottom end of the sliding block 8 is fixedly connected to the sliding end of the electric slide rail 7. The electric slide rail 7 drives the sliding block 8 to move along the axis of the electric turntable 4, thereby adjusting the distance between the sliding block 8 and the electric turntable 4.

[0033] Electric slide rail 7 refers to an electromechanical integrated device driven by a motor that can achieve automatic and precise linear movement along a fixed track (usually a straight line), and is an existing product.

[0034] A fixed cylinder 12 slides through the middle of the sliding block 8. A connecting post 10 is fixedly connected to one end of the fixed cylinder 12 near the middle of the electric turntable 4. The connecting post 10 can extend into the pipe fitting 23. The connecting post 10 enters the pipe fitting 23 from the branch opening of the pipe fitting 23 at the positioning plate 6.

[0035] An electric telescopic rod 9 is connected between the connecting column 10 and the sliding block 8.

[0036] Two electric telescopic rods 9 are provided, symmetrically fixed through the sliding block 8. A fixed cylinder 12 is located between the two electric telescopic rods 9, and the sliding direction of the fixed cylinder 12 is perpendicular to the sliding direction of the sliding block 8. A connecting column 10 is fixedly connected to the telescopic ends of the two electric telescopic rods 9. The control ends of the two electric telescopic rods 9 are electrically connected to the same synchronous controller, which drives the two electric telescopic rods 9 to telescopically extend and retract synchronously, thereby causing the connecting column 10 to move smoothly.

[0037] The connecting post 10 has an arc-shaped curved channel 11 at the end of the fixed cylinder 12, which communicates with the inner cavity of the fixed cylinder 12. The curved channel 11 is a 90-degree arc. When the connecting post 10 is located at the connection between the three branches inside the pipe fitting 23, one end of the curved channel 11 faces the closed end branch inside the through hole, and the other end of the curved channel 11 faces one of the open branches of the pipe fitting 23.

[0038] A metal sleeve 13 is slidably disposed inside the curved channel 11, and the end of the metal sleeve 13 can extend into the fixed cylinder 12. The metal sleeve 13 is a helical spring-shaped elastic metal part, which is a spring-shaped metal wire on the arm strength device. In the initial state, its helical metal wires are in close contact, which can bend when force is applied, and return to a straight shape after the force is removed. This allows the metal sleeve 13 to bend 90 degrees after passing through the curved channel 11, while the metal sleeve 13 is in a straight shape inside the fixed cylinder 12.

[0039] Metal sleeve 13 is made of high-temperature resistant spring steel, which can withstand the instantaneous high temperature generated by laser cutting and will not soften, deform or lose elasticity.

[0040] Several second mounting slots are evenly distributed within the connecting column 10 at one end of the curved channel 11 near the fixed cylinder 12. Each second mounting slot houses a first hub motor 17. A first rubber wheel is fixedly fitted onto the wheel of each first hub motor 17, and the outer surface of each first rubber wheel movably abuts against the outer surface of the metal sleeve 13. The first hub motors 17, in conjunction with the high-wear-resistant rubber wheels, form a conveying mechanism. Multiple sets of wheels rotate synchronously, smoothly propelling the metal sleeve 13 forward using friction.

[0041] A clamping assembly for fixing the metal sleeve 13 is provided at the end of the curved channel 11 away from the fixed cylinder 12.

[0042] There are two clamping components, which are symmetrical about the ends of the curved channel 11.

[0043] The clamping assembly includes clamping plates 19 and electric push rods 18. Two first mounting slots are symmetrically formed within the connecting post 10 at the end of the curved channel 11, and the two electric push rods 18 are respectively fixedly installed in the two first mounting slots. The clamping plates 19 are fixedly connected to the ends of the telescopic ends of the electric push rods 18, and the adjacent sides of the two clamping plates 19 movably abut against the outer surface of the metal sleeve 13. A small gap exists between the outer surface of the clamping plates 19 and the inner wall of the first mounting slot, allowing the clamping plates 19 to move while adapting to the opening shape of the first mounting slot, resulting in a good clamping effect on the metal sleeve 13.

[0044] A flexible metal tube 20 is slidably disposed inside the metal sleeve 13. The outer surface of the flexible metal tube 20 slides in contact with the metal sleeve 13, allowing the flexible metal tube 20 to deform together with the metal sleeve 13.

[0045] An air pump 21 is slidably installed inside the fixed cylinder 12, and the suction end of the air pump 21 is fixedly connected to one end of the metal hose 20. The air outlet of the air pump 21 faces the end of the fixed cylinder 12 away from the connecting column 10.

[0046] Several third mounting slots are evenly distributed on the outer surface of the air pump 21, and a second hub motor 22 is installed inside each third mounting slot. A second rubber wheel is fixedly fitted on the wheel of each second hub motor 22, and the outer surface of each second rubber wheel movably abuts against the inner wall of the fixed cylinder 12. The second hub motors 22 and the second rubber wheels are used to drive the air pump 21 to move along the axial direction of the fixed cylinder 12 inside the fixed cylinder 12, and the rotational speed of the several second hub motors 22 is the same.

[0047] Each of the first hub motor 17 and the second hub motor 22 is electrically connected to a controller.

[0048] A rubber layer 15 is fixedly provided at one end of the metal sleeve 13, and one side of the rubber layer 15 abuts against the closed end inside the pipe fitting 23.

[0049] One end of the metal sleeve 13 is coaxially and fixedly connected to the first end plate 14, and one end of the metal flexible tube 20 is fixedly connected to one side of the first end plate 14. The first end plate 14 fixes the ends of the metal flexible tube 20 and the metal sleeve 13 together. The rubber layer 15 is fixedly connected to the other side of the first end plate 14. Both the first end plate 14 and the rubber layer 15 are annular. The inner diameters of the rubber layer 15, the first end plate 14, and the metal flexible tube 20 are equal and coaxial.

[0050] The other end of the metal sleeve 13 is fixedly connected to a second end plate 16, and the other end of the metal hose 20 is fixedly passed through the second end plate 16. The second end plate 16 fixes the other end of the metal hose 20 and the metal sleeve 13 together.

[0051] A laser cutter 2 is installed at the top of the machine tool 1, and the laser cutter 2 is located above the pipe fitting 23. The laser cutter 2 is located on the side of the electric rotary table 4 near the pneumatic chuck 5.

[0052] An electric slide rail is fixedly installed at the top of the machine tool 1, and the laser cutter 2 is fixedly installed on the sliding end of the electric slide rail, thereby adjusting the position of the laser cutter 2.

[0053] A control method for a CNC cutting machine, using the CNC cutting machine as described above, includes the following steps: S1. Move the pipe fitting 23 into the through hole of the electric turntable 4, and the closed end of the pipe fitting 23 is located on the side of the electric turntable 4 away from the positioning plate 6. Operate the pneumatic chuck 5 to fix the pipe fitting 23. After fixing, the closed end branch of the pipe fitting 23 is coaxial with the through hole.

[0054] S2. Drive the connecting column 10 into the pipe fitting 23 by the electric telescopic rod 9 until the channel opening of the curved channel 11 away from the fixed cylinder 12 is coaxial with the through hole.

[0055] S3. Start the first hub motor 17 and the second hub motor 22, and deform the metal sleeve 13 and the metal hose 20 together by passing through the curved channel 11. After passing through the curved channel 11, the metal sleeve 13 returns to a straight shape, and the metal hose 20 deforms together with the metal sleeve 13 until the rubber layer 15 abuts against the inner wall of the closed end of the pipe fitting 23.

[0056] S4. Operate the two electric push rods 18 to make the two clamping plates 19 cooperate to clamp and fix the metal sleeve 13.

[0057] S5. Start the second hub motor 22 to drive the air pump 21 to move away from the connecting column 10. The air pump 21 applies axial compressive stress to the metal sleeve 13 through the metal hose 20 and the second end plate 16 to make it obtain bending stiffness, so that the straight metal sleeve 13 located at the closed end of the pipe fitting 23 has a supporting effect on the closed end of the pipe fitting 23.

[0058] S6. Start the air pump 21 to draw air from the metal hose 20, so that the rubber layer 15 has suction force on the inner closed end of the fitting 23, and fix the closed end of the fitting 23.

[0059] S7. Start the laser cutter 2 and control the electric turntable 4 to rotate to cut the pipe 23. The molten slag produced by the cutting falls onto the surface of the metal sleeve 13. At the same time, due to the fixation of the closed end of the pipe 23, the cut part of the metal sleeve 13 will not fall off.

[0060] S8. After cutting, release the adsorption and compressive stress, control the metal sleeve 13 to retract into the fixed cylinder 12, and scrape off the slag attached to the surface of the metal sleeve 13 by the end of the curved channel 11 during the retraction process.

[0061] Working principle: When in use, first insert the closed end of the fitting 23 of the tee pipe into the through hole in the middle of the electric turntable 4, and at the same time make the outer wall of the fitting part formed by the two open ends of the fitting 23 contact the V-shaped surface of the two positioning plates 6.

[0062] Since the V-shaped surface of the positioning plate 6 gradually tilts towards the side closer to the electric turntable 4 from both ends to the middle, it can guide the pipe fitting 23, so that the pipe fitting part formed by the two open ends of the pipe fitting 23 is parallel to the connecting column 10 and in the same horizontal plane.

[0063] When the pneumatic chuck 5 is activated, the multiple jaws on the pneumatic chuck 5 move synchronously towards the center, clamping and fixing the pipe fitting 23 from the outside. After fixing, the branch portion of the closed end of the pipe fitting 23 is concentric with the through hole.

[0064] Start the electric slide rail 7, which drives the sliding block 8 to move axially along the electric turntable 4. The sliding block 8 drives the connecting column 10 to move synchronously through the electric telescopic rod 9 and the fixed cylinder 12 until the connecting column 10 corresponds to the open end of the pipe fitting 23. Close the electric slide rail 7.

[0065] Start the electric telescopic rod 9. The telescopic end of the electric telescopic rod 9 pushes the connecting column 10 from the open end of the pipe fitting 23 into the pipe fitting 23. This causes the fixed cylinder 12 to slide within the sliding block 8, which in turn drives the metal sleeve 13, the metal hose 20, and the air pump 21 to move synchronously into the pipe fitting 23.

[0066] When the connecting column 10 moves to the center position of the electric turntable 4, the electric telescopic rod 9 is closed. At this time, the closed end branch of the pipe fitting 23, the center of the electric turntable 4, and one outlet end of the curved channel 11 on the connecting column 10 away from the fixed cylinder 12 are in a concentric state.

[0067] The controller starts the first hub motor 17 and the second hub motor 22, and makes them rotate at the same speed.

[0068] The first hub motor 17 drives the metal sleeve 13 to move along the curved channel 11 toward the closed end of the pipe fitting 23 via the first rubber wheel. The second hub motor 22 drives the air pump 21 to move along the fixed cylinder 12 toward the connecting column 10 via the second rubber wheel. The air pump 21 pushes the metal sleeve 13 to move synchronously through the metal hose 20 and the second end plate 16.

[0069] Since the first hub motor 17 and the second hub motor 22 have the same driving speed, the metal sleeve 13 and the metal hose 20 move synchronously as a whole.

[0070] The metal sleeve 13 deforms when passing through the curved channel 11, which in turn causes the metal hose 20 to deform. After extending out of the curved channel 11, the metal sleeve 13 automatically returns to a straight shape under its own elasticity, and the metal hose 20 deforms into a straight shape along with the metal sleeve 13.

[0071] Subsequently, under the continued drive of the first hub motor 17 and the second hub motor 22, the metal sleeve 13 located at the closed end branch of the pipe fitting 23 approaches the end face of the closed end of the pipe fitting 23 in a straight line.

[0072] When the rubber layer 15 at the end of the metal sleeve 13 abuts against the inner wall of the closed end of the pipe fitting 23, the first hub motor 17 and the second hub motor 22 are shut down.

[0073] Activate the electric push rod 18. The telescopic end of the electric push rod 18 pushes the clamping plate 19 closer to the metal sleeve 13. Until the clamping plate 19 abuts against the outer surface of the metal sleeve 13, the metal sleeve 13 is clamped and fixed.

[0074] The second hub motor 22 is started, and it rotates slightly in the opposite direction, driving the air pump 21 to move away from the connecting post 10. The air pump 21 pulls the metal sleeve 13 through the metal hose 20 and the second end plate 16. Since the metal sleeve 13 is clamped and fixed by the clamping plate 19 at this time, the straight section of the metal sleeve 13 located in the closed end branch of the pipe fitting 23 cannot move, thus subjecting this section of the metal sleeve 13 to axial compressive stress under the pulling action.

[0075] It should be noted that the metal sleeve 13 has a helical spring-like structure with its helical lines in close contact. When subjected to axial compressive stress, it no longer undergoes axial shortening but instead generates internal compressive stress, thereby significantly improving its bending stiffness and making this section of the metal sleeve 13 a rigid rod with supporting capabilities.

[0076] The air pump 21 is started, and its suction end draws air from the metal hose 20. Then, the first end plate 14 and the rubber layer 15 generate an adsorption force on the inner wall of the closed end of the pipe fitting 23, firmly adsorbing and fixing the waste section to be cut on the pipe fitting 23. At this time, the waste section is simultaneously supported by the rigidity of the metal sleeve 13 and fixed by the adsorption of the rubber layer 15, thus maintaining a stable state.

[0077] The laser cutter 2 is started to cut the pipe 23, and at the same time the electric turntable 4 is started to rotate within the fixed ring 3. The electric turntable 4 drives the pipe 23 to rotate synchronously through the pneumatic chuck 5, and the laser cutter 2 performs circumferential cutting on the closed end of the pipe 23.

[0078] During the cutting process, the metal sleeve 13 located inside the closed end of the pipe fitting 23 receives the high-temperature molten metal generated by laser cutting. The molten material drips onto the surface of the metal sleeve 13, reducing the chance of it falling directly onto the inner wall of the pipe fitting 23.

[0079] Meanwhile, since the metal sleeve 13 has been subjected to axial compressive stress and has bending stiffness, and the end is fixed by adsorption to the waste section to be cut, the waste section remains stable throughout the entire cutting process.

[0080] Especially towards the end of the cutting process, when only a tiny connection point remains between the waste section and the pipe fitting 23, the waste section will not shift or sag due to its own gravity. The final separation relies entirely on laser energy to melt and cut, resulting in a uniform and smooth melt solidification mark without mechanical tearing characteristics, thus avoiding irregular protrusions, pits, burrs, or sharp edges caused by tearing.

[0081] After cutting is completed, the laser cutter 2 is turned off, and the electric turntable 4 stops rotating. The air pump 21 is turned off to stop pumping air, and the waste section falls downward after losing its adsorption and fixation effect.

[0082] The second hub motor 22 is activated, driving the air pump 21 to move closer to the connecting post 10, relieving the axial compressive stress on the metal sleeve 13. The electric push rod 18 is activated to shorten, causing the clamping plate 19 to loosen its fixation on the metal sleeve 13.

[0083] The first hub motor 17 and the second hub motor 22 are started and rotated at the same speed, driving the metal sleeve 13 and the metal hose 20 to move as a whole into the fixed cylinder 12. Once inside the fixed cylinder 12, the metal sleeve 13 and the metal hose 20 return to a straight shape under their own elasticity.

[0084] During the process of the metal sleeve 13 being retracted and passing through the end of the curved channel 11, since the outer diameter of the metal sleeve 13 is matched with the diameter of the end of the curved channel 11, the end of the curved channel 11 can scrape off the solidified slag on the surface of the metal sleeve 13, thereby achieving automatic cleaning of the metal sleeve 13 and preparing it for the next use.

[0085] The electric telescopic rod 9 is shortened, causing the connecting column 10 to exit the pipe fitting 23 as a whole. The pneumatic chuck 5 is then released from its grip, removing the finished pipe fitting 23. The above steps are repeated to process the next pipe fitting 23.

[0086] When the metal sleeve 13 and metal hose 20 need to be thoroughly cleaned after prolonged use, the metal sleeve 13 can be moved out of the end of the fixed cylinder 12 away from the connecting post 10 by the first hub motor 17 and the second hub motor 22.

[0087] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A CNC cutting machine, comprising a machine tool (1), characterized in that: An electric turntable (4) is rotatably installed inside the machine tool (1). A sliding block (8) is slidably provided on one side of the electric turntable (4) along its axial direction. A fixed cylinder (12) slides through the middle of the sliding block (8). A connecting column (10) is fixedly connected to one end of the fixed cylinder (12) near the middle of the electric turntable (4). An electric telescopic rod (9) is connected between the connecting column (10) and the sliding block (8). The connecting column (10) has an arc-shaped curved channel (11) at the end of the fixed cylinder (12) that communicates with the inner cavity of the fixed cylinder (12). A metal sleeve (13) is slidably arranged inside the curved channel (11). A clamping assembly for fixing the metal sleeve (13) is provided at the end of the curved channel (11) away from the fixed cylinder (12). A metal hose (20) is slidably disposed inside the metal sleeve (13), and an air pump (21) is slidably disposed inside the fixed cylinder (12). The air pump (21) is fixedly connected to one end of the metal hose (20). The electric turntable (4) has a detachable pipe fitting (23) with a three-way pipe installed in the middle. The connecting column (10) can be inserted into the pipe fitting (23). One end of the metal sleeve (13) is fixedly provided with a rubber layer (15). One side of the rubber layer (15) abuts against the closed end inside the pipe fitting (23). The top of the machine tool (1) is provided with a laser cutter (2). The laser cutter (2) is located above the pipe fitting (23).

2. The CNC cutting machine according to claim 1, characterized in that: The machine tool (1) is fixedly provided with a fixed ring (3). Two support rods are symmetrically fixedly connected to the bottom end of the fixed ring (3). The bottom ends of the two support rods are fixedly connected to the bottom surface inside the machine tool (1). The electric turntable (4) is coaxially rotated and installed inside the fixed ring (3).

3. A CNC cutting machine according to claim 1, characterized in that: The electric turntable (4) has a through hole in the middle, and the closed end branch of the pipe fitting (23) is movably set in the through hole. Two positioning plates (6) are symmetrically fixedly connected at the through hole on one side of the electric turntable (4). The side of the two positioning plates (6) that are close to each other is coplanar with the inner wall of the through hole. The other two open branches of the pipe fitting (23) are respectively movably set on one side of the two positioning plates (6). The positioning plate (6) is V-shaped on the side away from the electric turntable (4), and the V-shaped surface of the positioning plate (6) gradually tilts towards the side closer to the electric turntable (4) from both ends to the middle.

4. A CNC cutting machine according to claim 3, characterized in that: A pneumatic chuck (5) is fixedly installed in the middle of the electric turntable (4). The placement hole in the middle of the pneumatic chuck (5) corresponds to the through hole. The ends of the multiple claws on the pneumatic chuck (5) that are close to each other are movably abutting against the outer surface of the pipe fitting (23). The claws on the pneumatic chuck (5) are located on the side of the electric turntable (4) away from the positioning plate (6).

5. A CNC cutting machine according to claim 1, characterized in that: An electric slide rail (7) is fixedly installed on one side of the electric turntable (4), and the bottom end of the sliding block (8) is fixedly connected to the sliding end of the electric slide rail (7).

6. A CNC cutting machine according to claim 1, characterized in that: Two electric telescopic rods (9) are provided, and the two electric telescopic rods (9) are symmetrically fixed through the sliding block (8). The fixed cylinder (12) is located between the two electric telescopic rods (9), and the sliding direction of the fixed cylinder (12) is perpendicular to the sliding direction of the sliding block (8). The connecting column (10) is fixedly connected to the telescopic end of the two electric telescopic rods (9).

7. A CNC cutting machine according to claim 1, characterized in that: Two clamping assemblies are provided, and the two clamping assemblies are symmetrical about the ends of the curved channel (11); The clamping assembly includes a clamping plate (19) and an electric push rod (18). The connecting column (10) has two first mounting slots symmetrically opened at the end of the curved channel (11). The two electric push rods (18) are fixedly installed in the two first mounting slots respectively. The clamping plate (19) is fixedly connected to the end of the telescopic end of the electric push rod (18). The two clamping plates (19) are movably abutting against the outer surface of the metal sleeve (13) on the side that is close to each other.

8. A CNC cutting machine according to claim 1, characterized in that: One end of the metal sleeve (13) is coaxially fixedly connected to the first end plate (14), one end of the metal hose (20) is fixedly connected to one side of the first end plate (14), and the rubber layer (15) is fixedly connected to the other side of the first end plate (14). The other end of the metal sleeve (13) is fixedly connected to a second end plate (16), and the other end of the metal hose (20) is fixedly passed through the second end plate (16).

9. A CNC cutting machine according to claim 1, characterized in that: The connecting column (10) has several second mounting slots evenly provided at one end of the curved channel (11) near the fixed cylinder (12). Each second mounting slot is equipped with a first hub motor (17). Each first hub motor (17) has a first rubber wheel fixedly fitted on its wheel. The outer surface of each first rubber wheel is movably abutting against the outer surface of the metal sleeve (13). The air pump (21) has several third mounting slots evenly distributed on its outer surface. Each third mounting slot is equipped with a second hub motor (22). Each second hub motor (22) has a second rubber wheel fixedly mounted on its wheel. The outer surface of each second rubber wheel is movably abutting against the inner wall of the fixed cylinder (12).

10. A control method for a CNC cutting machine, characterized in that: Using the CNC cutting machine as described in any one of claims 1-9 includes the following steps: S1. Move the pipe fitting (23) into the through hole of the electric turntable (4), and the closed end of the pipe fitting (23) is located on the side of the electric turntable (4) away from the positioning plate (6). Operate the pneumatic chuck (5) to fix the pipe fitting (23). After fixing, the closed end branch of the pipe fitting (23) is coaxial with the through hole. S2. Drive the connecting column (10) into the pipe fitting (23) by the electric telescopic rod (9) until the channel opening of the curved channel (11) away from the fixed cylinder (12) is coaxial with the through hole; S3. Start the first hub motor (17) and the second hub motor (22), and deform the metal sleeve (13) and the metal hose (20) together by passing through the curved channel (11). After passing through the curved channel (11), the metal sleeve (13) returns to a straight shape, and the metal hose (20) deforms together with the metal sleeve (13) until the rubber layer (15) abuts against the inner wall of the closed end of the pipe fitting (23); S4. Operate the two electric push rods (18) to make the two clamping plates (19) cooperate to clamp and fix the metal sleeve (13); S5. Start the second hub motor (22) and drive the air pump (21) to move away from the connecting column (10). The air pump (21) applies axial compressive stress to the metal sleeve (13) through the metal hose (20) and the second end plate (16) to make it obtain bending stiffness, so that the straight metal sleeve (13) located at the closed end of the pipe fitting (23) has a supporting effect on the closed end of the pipe fitting (23); S6. Start the air pump (21) to draw air from the metal hose (20), so that the rubber layer (15) has a suction force on the inner closed end of the fitting (23), and fix the closed end of the fitting (23); S7. Start the laser cutter (2) and control the electric turntable (4) to rotate to cut the pipe (23). The molten slag produced by the cutting falls onto the surface of the metal sleeve (13). At the same time, due to the fixation of the closed end of the pipe (23), the cut metal sleeve (13) will not fall off. S8. After cutting, release the adsorption and compression stress, and control the metal sleeve (13) to retract into the fixed cylinder (12). During the retraction process, the slag attached to the surface of the metal sleeve (13) is scraped off by the end of the curved channel (11).

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