High-precision double-sided circular weft knitting machine and knitting control method

Abstract

The invention relates to a high-precision double-sided circular knitting machine and a knitting control method, and relates to the technical field of knitting equipment, a rack is fixedly installed on the outer side of a shell, a supporting ring is installed at the top of the rack, a supporting column is fixedly installed on the upper end face of the supporting ring, a yarn guide frame is arranged at the upper end of the supporting column, and a yarn guide rod is arranged on the yarn guide frame. A yarn connecting frame is installed on the inner side of the yarn guide frame, a triangular bottom plate is arranged on the inner side of the yarn guide frame, a guide triangular device is arranged on the surface of the triangular bottom plate, and the guide triangular device comprises a needle guide triangle, a forward density triangle, a herringbone triangle, a reverse density triangle and a guide triangle. The control module receives a needle rail gap signal, an instruction is generated based on the acting force of a needle butt on the triangular working face to drive the servo motor to adjust the inclination angle of the guide triangular device, the knitting precision is dynamically controllable, machine part abrasion is reduced, the service life of equipment is prolonged, and the device is suitable for high-density knitting of superfine denier polyester filaments.

Description

Technical Field

[0001] This application relates to the field of knitting equipment technology, and in particular to a high-precision double-sided circular knitting machine and its knitting control method. Background Technology

[0002] A weft knitting machine is a knitting machine that feeds yarn into knitting needles along the weft direction to knit weft-knitted fabrics. According to the shape of its "needle bed", it can be divided into circular weft knitting machines and flat weft knitting machines.

[0003] In the prior art, for related technologies of double-sided circular knitting machines, please refer to Chinese Patent Publication No. CN113802258B, which discloses a double-sided circular knitting machine, including a knitting machine body and a sinker triangle for the needle cylinder knitting structure on the knitting machine body. The sinker triangle includes a return needle part arranged in a plane and a corner part with an opening facing downwards. The return needle part and the corner part are connected by an arc-shaped connecting part with an opening facing upwards. By lengthening the plane part of the return needle part, the amount of yarn contained in the lower needle is increased several times. The amount of yarn required when the upper needle forms a loop can be evenly distributed on multiple needles of the lower needle. The force between the positive and negative loops formed by the upper and lower needles is uniform, and it is not easy to produce loop twisting. The fabric surface is flat, the upper and lower loops are balanced, and it is not easy to form horizontal stripes. The fabric will not produce edge curling, improving the fabric's non-unraveling and elongation. Moreover, the fabric surface has a strong three-dimensional effect and good light transmission between the upper and lower fabric surfaces.

[0004] Existing traditional double-sided circular knitting machines often only adjust the yarn supply and cannot compensate for the loop depth in real time. Due to wear of the triangular track or uneven yarn tension, the loop length on the front and back of the fabric is easily different, which can lead to fabric curling and uneven thickness. Summary of the Invention

[0005] The purpose of this application is to provide a high-precision double-sided circular knitting machine and a knitting control method.

[0006] Firstly, the high-precision double-sided circular knitting machine provided in this application adopts the following technical solution:

[0007] A high-precision double-sided circular knitting machine includes a housing. A frame is fixedly installed on the outer side of the housing. A support ring is installed on the top of the frame. A support column is fixedly installed on the upper end face of the support ring. A yarn guide frame is provided at the upper end of the support column. A yarn connecting frame is installed on the inner side of the yarn guide frame. A triangular base plate is provided on the inner side of the yarn guide frame. A guide triangular device is provided on the surface of the triangular base plate. The guide triangular device includes a guide needle triangular device, a forward density triangular device, a herringbone triangular device, a reverse density triangular device, and a guide triangular device.

[0008] By adopting the above technical solution, the shell serves as the main load-bearing body of the whole machine, and the frame is fixed to the outside of the shell with bolts to provide a support frame. The rigid welded structure of the frame bears the radial load during weaving, the planar accuracy of the support ring ensures the accurate positioning of subsequent components, and the yarn connecting frame is an existing technical structure that can adapt to different yarn counts. A closed-loop track is formed through the guide triangle device.

[0009] A guide triangle is provided on one side of the surface of the triangular base plate, a positive density triangle is provided on one side of the guide triangle, a herringbone triangle is provided on one side of the positive density triangle, a reverse density triangle is provided on the side of the herringbone triangle away from the positive density triangle, and a guide triangle is provided on one side of the reverse density triangle. The guide triangle, positive density triangle, herringbone triangle, reverse density triangle and guide triangle cooperate with each other to form a triangular track.

[0010] By adopting the above technical solution, the guide cam serves as the initial yarn entry point to guide the movement of the needle hook. The forward density cam adjusts the yarn tension to achieve dense knitting. The herringbone cam separates the yarn in both directions to avoid tangling. The reverse density cam controls the amount of yarn released during the loop-out stage. The guide cam completes the final loop-forming positioning, forming a closed loop track. The needle heel moves along the track and first contacts the rising slope of the guide cam. The needle heel is pushed inward by the slope, and the needle rises vertically. The needle hook picks up the yarn. After the needle heel reaches the highest point of the cam, the old loop slides down and opens the needle tongue, and the new yarn forms a loop. When the needle heel enters the descending slope of the cam, the needle is forced down and the needle tongue closes, thereby locking the new loop. The old loop comes off the needle hook. The needle heel passes through the horizontal section of the cam track, and the needle remains in a low position, preparing for the next loop-forming cycle.

[0011] The triangular base plate and the guide triangular device are fixedly connected by a connecting assembly. The connecting assembly includes a connecting cylinder, a positioning magnetic block, a movable groove, a telescopic cylinder, a spring, a top block, and an electromagnetic module. The connecting cylinder is embedded inside the triangular base plate, and the connecting cylinder and the triangular base plate are movably connected via a bearing. A positioning magnetic block is fixedly connected to the inner end of the connecting cylinder. Movable grooves are provided on both sides of the inner wall of the connecting cylinder. A telescopic cylinder is fixedly connected to the inner wall of each movable groove. The telescopic end of the telescopic cylinder is a permanent magnet, and a spring is sleeved on the outer wall of the telescopic cylinder. The telescopic end of the telescopic cylinder is fixedly connected to a top block, and one end of the spring is also connected to the top block. One end of the top block extends to the outside of the movable groove. An electromagnetic module is provided at the end of the movable groove. The connecting assembly also includes a connecting rod, a magnetic block, and a slot. The connecting rod is fixedly connected to the guide triangle device. The connecting rod is embedded in the connecting cylinder. A magnetic block is fixedly connected to the end of the connecting rod. The magnetic block matches the positioning magnetic block. Slots are provided on the outer walls of both sides of the middle part of the connecting rod. The slots match the top block, and the top block is embedded in the slot.

[0012] By adopting the above technical solution, the connecting components can firmly connect the guide triangle device to the triangular base plate, and the individual triangle can be quickly disassembled and replaced after wear. During installation, the guide triangle device is inserted into the connecting cylinder inside the triangular base plate via a connecting rod fixed to one side. The magnetic attraction block at the end of the connecting rod and the positioning magnetic block on the inner wall of the connecting cylinder generate a magnetic attraction force, pulling the connecting rod axially to the preset position. The magnetic attraction force achieves millimeter-level precision positioning and eliminates mechanical backlash. At this time, the slot on the surface of the connecting rod moves to the position of the top block. The top block is springed back by the spring and thus embedded in the slot, thereby initially positioning the connecting rod. Subsequently, the control module controls the auxiliary power supply to energize the positioning magnetic block and the electromagnetic module. After connection, the electromagnetic module is energized to generate a reverse magnetic field, forming a magnetic repulsion force, which pushes the permanent magnet at the telescopic end of the telescopic cylinder out, thereby pushing the top block out of the movable slot. The top block is pushed out, thereby increasing the tightness of the connecting rod. The spring force combined with the electromagnetic double fixation ensures the connection strength of the guide triangle device. At the same time, the magnetic poles between the positioning magnetic block and the electromagnetic module always remain opposite. The electromagnetic module generates magnetic repulsion while the positioning magnetic block generates magnetic attraction, thereby further fixing the guide triangle device. When the guide triangle device is worn and needs to be replaced, the control module controls the magnetic pole reversal between the positioning magnetic block and the electromagnetic module. The electromagnetic module is energized to generate a positive magnetic field, attracting the permanent magnet at the telescopic end of the telescopic cylinder to retract, thereby driving the top block to retract into the movable groove, so that the top block moves out of the slot. At this time, the spring is compressed and stored energy. At the same time, the electromagnetic module reverses the magnetic pole to form a magnetic repulsion force on the magnetic attraction block, thereby pushing the unfixed automatic connecting rod out a certain distance, thus realizing the quick disassembly and replacement of the guide triangle device.

[0013] The positioning magnetic block is an electromagnet, and a pressure sensor is provided on the outer wall of the connecting rod. Multiple pressure sensors are provided and arranged at equal intervals. An auxiliary power supply is provided on one side of the triangular base plate. The auxiliary power supply is electrically connected to the positioning magnetic block and the electromagnetic module respectively.

[0014] By adopting the above technical solution, the pressure sensor can monitor the force exerted by the needle heel on the triangular working surface in real time. Based on the force signal, the electromagnetic strength of the positioning magnetic block and electromagnetic module can be dynamically adjusted to ensure the stability of the operation. At the same time, the angle offset of the guide triangular device and the speed of the pull roller can be adjusted in real time according to the pressure. By adjusting the guide triangular device by ±0.5°, the force exerted by the needle heel on the triangular working surface can be reduced, the wear of machine parts can be reduced, and the service life of the equipment can be extended. The auxiliary power supply plays the role of energy storage and can supply power to the positioning magnetic block and electromagnetic module to ensure the fastening of the guide triangular device. Even in the event of a power failure, it can be fixed by the reverse force of the spring.

[0015] An angle offset component is provided on one side of the connecting cylinder. The angle offset component includes a drive shaft, a worm gear, a fixed frame, a worm, and a servo motor. A drive shaft is fixedly connected to one end of the connecting cylinder. The end of the drive shaft away from the connecting cylinder passes through a triangular base plate and is connected to the worm gear. A fixed frame is fixedly connected to the outer wall of the triangular base plate away from the guide triangular device. Multiple fixed frames are provided and matched with the guide triangular device. A worm is connected to the inner wall of the middle of the fixed frame through a bearing. The worm meshes with the worm gear. A servo motor is fixedly connected to the outer wall of one side of the fixed frame. The output end of the servo motor is connected to the worm, and a brake device is provided inside the servo motor.

[0016] By adopting the above technical solution, the control module receives the needle rail gap signal, generates pulse commands based on the force exerted by the needle heel on the triangular working surface to drive the servo motor, the servo motor drives the worm gear to rotate, the rotation of the worm gear drives the worm wheel at the end of the drive shaft to rotate, thereby driving the drive shaft and the connecting cylinder to adjust the angle, realizing dynamic controllability of weaving accuracy. The self-locking property of the worm wheel and worm gear ensures that the adjusted angle is fixed. At the same time, after the action is completed, the servo motor brake device is energized to achieve fixed locking.

[0017] An angle encoder is installed on one side of the servo motor and is electrically connected to the servo motor. The angle encoder provides real-time feedback of the worm gear rotation angle. A control module is installed on one side of the housing.

[0018] By adopting the above technical solution, the angle encoder samples the actual rotation angle of the servo motor every 5ms, and the control module realizes the control of the device.

[0019] The edge of the guide triangle device is arc-shaped, and the pressure pin section of the guide triangle device is a concave curved surface, while the return pin section is a convex curved surface.

[0020] By adopting the above technical solution, the arc and curved edges of the guide triangle device can reduce needle heel impact, reduce machine wear, and extend equipment life. It is suitable for high-density weaving of ultra-fine denier polyester filament.

[0021] The control compilation method includes the following steps:

[0022] Step 1: Equipment self-test, angle encoder returns to zero, servo motor drives worm gear to rotate to zero position, connection components are powered on for testing, electromagnetic module is powered on to verify telescopic cylinder retraction response;

[0023] Step 2: After the yarn passes through the yarn guide frame and enters the yarn connecting frame, it enters the guide needle triangle entrance. The needle heel moves along the track and first contacts the rising slope of the guide needle triangle. The needle heel is pushed inward by the slope and the needle rises vertically. The needle hook picks up the yarn. After the needle heel reaches the highest point of the triangle, the old loop slides down and opens the needle tongue, and the new yarn forms a loop. When the needle heel enters the descending slope of the triangle, the needle is forced down and the needle tongue closes, thereby locking the new loop. The old loop is dislodged from the needle hook. The needle heel passes through the horizontal section of the triangle track and the needle remains in a low position, ready for the next loop forming cycle.

[0024] Step 3: The pressure sensor monitors the force exerted by the needle heel on the triangular working surface in real time. Based on the force signal, the electromagnetic strength of the positioning magnetic block and electromagnetic module is dynamically adjusted to ensure working stability. At the same time, the angle offset of the guide triangle device and the speed of the pull roller are adjusted in real time according to the pressure. The force exerted by the needle heel on the triangular working surface is reduced by adjusting the guide triangle device by ±0.5°, thereby reducing the wear of machine parts.

[0025] Step 4: Based on the force exerted by the needle heel on the triangular working surface, a pulse command is generated to drive the servo motor. The servo motor drives the worm gear to rotate, and the rotation of the worm gear drives the worm wheel at the end of the drive shaft to rotate, thereby driving the drive shaft and the connecting cylinder to adjust the angle, so as to achieve dynamic control of the weaving accuracy.

[0026] Step 5: The angle encoder samples the actual rotation angle of the servo motor every 5ms, and the control module controls the device.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The connection strength of the guide triangle device is ensured by the spring force combined with the double fixation of the electromagnetic force. At the same time, the magnetic poles between the positioning magnetic block and the electromagnetic module are always opposite. The electromagnetic module generates magnetic repulsion while the positioning magnetic block generates magnetic attraction, thereby further fixing the guide triangle device. When the guide triangle device is worn and needs to be replaced, the control module controls the magnetic pole reversal between the positioning magnetic block and the electromagnetic module. The electromagnetic module is energized to generate a positive magnetic field, which attracts the permanent magnet at the telescopic end of the telescopic cylinder to retract, thereby driving the top block to retract into the movable groove, so that the top block moves out of the slot. At this time, the spring is compressed and stored energy. At the same time, the electromagnetic module reverses the magnetic pole to form a magnetic repulsion force on the magnetic block, thereby pushing the automatic connecting rod that is not fixedly connected out a certain distance, thus realizing the quick disassembly and replacement of the guide triangle device.

[0029] 2. The control module receives the needle rail gap signal and generates pulse commands based on the force exerted by the needle heel on the triangular working surface to drive the servo motor. The servo motor drives the worm gear to rotate, and the rotation of the worm gear drives the worm wheel at the end of the drive shaft to rotate, thereby driving the drive shaft and the connecting cylinder to adjust the angle, realizing dynamic control of weaving accuracy, reducing machine wear, and extending equipment life. It is suitable for high-density weaving of ultra-fine denier polyester filament. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the guide triangle device structure according to an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the three-dimensional connection structure of the guide triangle and the connecting rod according to an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the connection structure between the triangular base plate and the guide triangular device in an embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the connection component structure according to an embodiment of this application;

[0035] Figure 6 This is a diagram showing the internal connection structure of the connecting cylinder according to an embodiment of this application;

[0036] Figure 7 This is a schematic diagram of the connection structure between the connecting rod and the guide triangle device according to an embodiment of this application;

[0037] Figure 8 This is a schematic diagram of the angle offset component structure according to an embodiment of this application;

[0038] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Frame; 3. Support ring; 4. Support column; 5. Yarn guide frame; 6. Yarn connecting frame; 7. Triangular base plate; 8. Guide triangular device; 9. Guide pin triangular device; 10. Forward density triangular device; 11. Herringbone triangular device; 12. Reverse density triangular device; 13. Guide triangular device; 14. Connecting assembly; 15. Connecting cylinder; 16. Positioning magnetic block; 17. Movable groove; 18. Telescopic cylinder; 19. Spring; 20. Top block; 21. Electromagnetic module; 22. Connecting rod; 23. Magnetic block; 24. Slot; 25. Pressure sensor; 26. Auxiliary power supply; 27. Angle offset assembly; 28. Drive shaft; 29. ​​Worm gear; 30. Fixing frame; 31. Worm; 32. Servo motor; 33. Angle encoder; 34. Control module. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1 - Appendix Figure 8This application will be described in further detail below.

[0040] Example 1: A high-precision double-sided circular knitting machine includes a housing 1, a frame 2 fixedly mounted on the outside of the housing 1, a support ring 3 mounted on the top of the frame 2, a support column 4 fixedly mounted on the upper end of the support ring 3, a yarn guide frame 5 at the upper end of the support column 4, a yarn connecting frame 6 mounted on the inner side of the yarn guide frame 5, a triangular base plate 7 on the inner side of the yarn guide frame 5, and a guide triangular device 8 on the surface of the triangular base plate 7. The guide triangular device 8 includes a needle guide 9, a forward density 10, a herringbone 11, a reverse density 12, and a guide 13. The housing 1 serves as the main load-bearing structure of the machine. The frame 2 is fixed to the outside of the housing 1 by bolts to provide a support frame. The rigid welded structure of the frame 2 bears the radial load during knitting. The planar accuracy of the support ring 3 ensures accurate positioning of subsequent components. The yarn connecting frame 6 is a prior art structure that can adapt to different yarn counts and forms a closed-loop track through the guide triangular device 8.

[0041] A guide cam 9 is provided on one side of the surface of the triangular base plate 7. A forward density cam 10 is provided on one side of the guide cam 9. A herringbone cam 11 is provided on one side of the forward density cam 10. A reverse density cam 12 is provided on the side of the herringbone cam 11 away from the forward density cam 10. A guide cam 13 is provided on the side of the reverse density cam 12. The guide cam 9, forward density cam 10, herringbone cam 11, reverse density cam 12, and guide cam 13 cooperate with each other to form a triangular track. Among them, the guide cam 9 serves as the initial yarn entry point to guide the movement of the needle hook, and the forward density cam 10 adjusts the yarn tension to achieve dense stitch knitting. The herringbone triangle 11 separates yarns in both directions to avoid tangling, the reverse density triangle 12 controls the amount of yarn released during the loop-out stage, and the guide triangle 13 completes the final loop-forming positioning, forming a closed loop track. The needle heel moves along the track and first contacts the rising slope of the guide triangle 9. The needle heel is pushed inward by the slope and the needle rises vertically. The needle hook picks up the yarn. After the needle heel reaches the highest point of the triangle, the old loop slides down and opens the needle tongue, and the new yarn forms a loop. When the needle heel enters the descending slope of the triangle, the needle is forced down and the needle tongue closes, thereby locking the new loop. The old loop comes off the needle hook. The needle heel passes through the horizontal section of the triangle track and the needle remains in a low position, preparing for the next loop-forming cycle.

[0042] The triangular base plate 7 and the guide triangular device 8 are fixedly connected by a connecting assembly 14. The connecting assembly 14 includes a connecting cylinder 15, a positioning magnetic block 16, a movable groove 17, a telescopic cylinder 18, a spring 19, a top block 20, and an electromagnetic module 21. The connecting cylinder 15 is embedded inside the triangular base plate 7, and the connecting cylinder 15 and the triangular base plate 7 are movably connected by a bearing. The positioning magnetic block 16 is fixedly connected to the inner end of the connecting cylinder 15. Movable grooves 17 are provided on both sides of the inner wall of the connecting cylinder 15. The telescopic cylinder 18 is fixedly connected to the inner wall of the movable groove 17. The telescopic end of the telescopic cylinder 18 is a permanent magnet. The outer wall of the telescopic cylinder 18 is fitted with a spring 19. The telescopic end of the telescopic cylinder 18 is fixedly connected to the top block 20, and one end of the spring 19 is also connected to the top block 20. One end of the top block 20 extends to the outside of the movable groove 17. An electromagnetic module 21 is provided at the end of the movable groove 17. The connecting assembly 14 also includes a connecting rod 22, a magnetic block 23, and a slot 24. The connecting rod 22 is fixedly connected to the guide triangular device 8. The connecting rod 22 is embedded in the connecting cylinder 15. A magnetic block 23 is fixedly connected to the end of the connecting rod 22. The magnetic block 23 matches the positioning magnetic block 16. Slots 24 are provided on the outer walls of both sides of the middle part of the connecting rod 22. The slots 24 match the top block 20, and the top block 20 is embedded in the slots 24. The connecting assembly 14 can guide the triangular device 8 to be firmly connected to the triangular base plate 7. The triangular device can be quickly disassembled and replaced after wear. During installation, the guide triangular device 8 is connected by a connecting rod fixed to one side of it. The rod 22 is inserted into the connecting cylinder 15 inside the triangular base plate 7. The magnetic attraction block 23 at the end of the rod 22 and the positioning magnetic block 16 on the inner wall of the connecting cylinder 15 generate a magnetic attraction force, which pulls the rod 22 axially to the preset position. The magnetic attraction force achieves millimeter-level precision positioning and eliminates mechanical backlash. At this time, the slot 24 on the surface of the rod 22 moves to the position of the top block 20. The top block 20 is embedded in the slot 24 by the contraction and rebound of the spring 19, thus performing preliminary positioning of the rod 22. Subsequently, the control module 34 controls the auxiliary power supply 26 to energize the positioning magnetic block 16 and the electromagnetic module 21. After connection, the electromagnetic module 21 is energized to generate a reverse magnetic field, forming a magnetic repulsion force, which pushes the permanent magnet at the telescopic end of the telescopic cylinder 18 out, thereby pushing the top block 20 out of the movable groove 17. This enhances the tightness of the connecting rod 22. The spring force of spring 19, combined with the electromagnetic double fixation, ensures the connection strength of the guide triangle device 8. Simultaneously, the magnetic poles between the positioning magnetic block 16 and the electromagnetic module 21 remain opposite. The electromagnetic module 21 generates magnetic repulsion, while the positioning magnetic block 16 generates magnetic attraction, further securing the guide triangle device 8. When the guide triangle device 8 wears out and needs replacement, the control module 34 controls the magnetic pole reversal between the positioning magnetic block 16 and the electromagnetic module 21. The electromagnetic module 21 is energized, generating a positive magnetic field that attracts the permanent magnet at the telescopic end of the telescopic cylinder 18 to retract, thereby causing the top block 20 to retract into the movable groove 17. This allows the top block 20 to move out of the slot 24. At this time, spring 19 is compressed and stores energy.Simultaneously, the electromagnetic module 21 converts its magnetic poles to generate a magnetic repulsion force against the magnetic block 23, thereby pushing the non-fixed automatic linkage 22 a certain distance, thus enabling the quick disassembly and replacement of the guide triangle device 8.

[0043] The positioning magnetic block 16 is an electromagnet. A pressure sensor 25 is installed on the outer wall of the connecting rod 22. Multiple pressure sensors 25 are arranged at equal intervals. An auxiliary power supply 26 is installed on one side of the triangular base plate 7. The auxiliary power supply 26 is electrically connected to the positioning magnetic block 16 and the electromagnetic module 21. The pressure sensor 25 can monitor the force exerted by the needle heel on the working surface of the triangle in real time. Based on the force signal, the electromagnetic strength of the positioning magnetic block 16 and the electromagnetic module 21 is dynamically adjusted to ensure the stability of the operation. At the same time, the angle offset of the guide triangle device 8 and the speed of the pull roller can be adjusted in real time according to the pressure. By adjusting the guide triangle device 8 by ±0.5°, the force exerted by the needle heel on the working surface of the triangle can be reduced, reducing the wear of machine parts and extending the service life of the equipment. The auxiliary power supply 26 acts as an energy storage device, which can supply power to the positioning magnetic block 16 and the electromagnetic module 21 to ensure the fastening of the guide triangle device 8. Even in the event of a power failure, it can be fixed by the reverse force of the spring 19.

[0044] An angle offset component 27 is provided on one side of the connecting cylinder 15. The angle offset component 27 includes a drive shaft 28, a worm gear 29, a fixed frame 30, a worm 31, and a servo motor 32. The drive shaft 28 is fixedly connected to one end of the connecting cylinder 15. The end of the drive shaft 28 away from the connecting cylinder 15 passes through the triangular base plate 7 and is connected to the worm gear 29. The fixed frame 30 is fixedly connected to the outer wall of the side of the triangular base plate 7 away from the guide triangular device 8. Multiple sets of fixed frames 30 are provided and matched with the guide triangular device 8. The worm 31 is connected to the inner wall of the middle part of the fixed frame 30 through a bearing. The worm 31 meshes with the worm gear 29. The servo motor 32 is fixedly connected to the outer wall of one side of the fixed frame 30. The output end of the servo motor 32 is connected to the worm gear 31, and the servo motor 32 is equipped with a brake device. The control module 34 receives the needle rail gap signal and generates a pulse command based on the force of the needle heel on the triangular working surface to drive the servo motor 32. The servo motor 32 drives the worm gear 31 to rotate. The rotation of the worm gear 31 drives the worm wheel 29 at the end of the drive shaft 28 to rotate, thereby driving the drive shaft 28 and the connecting cylinder 15 to adjust the angle, realizing dynamic control of the weaving accuracy. The self-locking property of the worm wheel 29 and the worm gear 31 ensures that the adjusted angle is fixed. At the same time, after the action is completed, the brake device of the servo motor 32 is energized to lock it in place.

[0045] An angle encoder 33 is installed on one side of the servo motor 32. The angle encoder 33 is electrically connected to the servo motor 32. The angle encoder 33 provides real-time feedback on the rotation angle of the worm gear 29. A control module 34 is installed on one side of the housing 1. The angle encoder 33 samples the actual rotation angle of the servo motor 32 every 5ms. The control module 34 controls the device.

[0046] The edge of the guide triangle device 8 is arc-shaped, and the needle pressing section of the guide triangle device 8 is a concave curved surface, while the needle return section is a convex curved surface. The arc-shaped and curved edge of the guide triangle device 8 can reduce needle heel impact, reduce machine wear, and extend equipment life. It is suitable for high-density weaving of ultra-fine denier polyester filament.

[0047] The development of control methods includes the following steps:

[0048] Step 1: Equipment self-test, angle encoder 33 returns to zero, servo motor 32 drives worm gear 31 to rotate to zero position, connection component 14 is powered on for testing, electromagnetic module 21 is powered on to verify telescopic cylinder 18 retraction response;

[0049] Step 2: After the yarn passes through the yarn guide frame 5 and into the yarn connecting frame 6, it enters the guide needle triangle 9. The needle heel of the tube needle moves along the track and first contacts the rising slope of the guide needle triangle 9. The needle heel is pushed inward by the slope and the tube needle rises vertically. The needle hook picks up the yarn. After the needle heel reaches the highest point of the triangle, the old loop slides down and opens the needle tongue, and the new yarn forms a loop. When the needle heel enters the descending slope of the triangle, the tube needle is forced down and the needle tongue closes, thereby locking the new loop. The old loop is dislodged from the needle hook. The needle heel passes through the horizontal section of the triangle track and the tube needle remains in a low position, ready for the next loop forming cycle.

[0050] Step 3: The pressure sensor 25 monitors the force exerted by the needle heel on the triangular working surface in real time. Based on the force signal, the electromagnetic strength of the positioning magnetic block 16 and the electromagnetic module 21 is dynamically adjusted to ensure the stability of the operation. At the same time, the angle offset of the guide triangular device 8 and the speed of the pull roller are adjusted in real time according to the pressure. By adjusting the guide triangular device 8 by ±0.5°, the force exerted by the needle heel on the triangular working surface is reduced, and the wear of the machine parts is reduced.

[0051] Step 4: Based on the force exerted by the needle heel on the triangular working surface, a pulse command is generated to drive the servo motor 32. The servo motor 32 drives the worm gear 31 to rotate. The rotation of the worm gear 31 drives the worm wheel 29 at the end of the drive shaft 28 to rotate, thereby driving the drive shaft 28 to adjust the angle with the connecting cylinder 15, so as to achieve dynamic control of the weaving accuracy.

[0052] Step 5: The angle encoder 33 samples the actual rotation angle of the servo motor 32 every 5ms, and the control module 34 controls the device.

[0053] The implementation principle of this application embodiment is as follows: First, the equipment performs a self-test, the angle encoder 33 returns to zero, the servo motor 32 drives the worm gear 31 to rotate to the zero position, the connecting component 14 is powered on for testing, the electromagnetic module 21 is powered on to verify the retraction response of the telescopic cylinder 18, the yarn passes through the yarn guide frame 5 to the yarn connecting frame 6 and then enters the entrance of the guide needle triangle 9, the needle heel moves along the track, it first contacts the rising slope of the guide needle triangle 9, the needle heel is pushed inward by the slope and the needle rises vertically, the needle hook picks up the yarn, after the needle heel reaches the highest point of the triangle, the old coil slides down and opens the needle tongue, the new yarn forms a coil, the needle heel enters the descending slope of the triangle and the needle is forced down and the needle tongue closes, thereby locking the new coil and the old coil The needle hook is disengaged, and the needle heel is kept in a low position by the horizontal section of the triangular track, ready for the next looping cycle. The connecting component 14 guides the triangular device 8 to the triangular base plate 7 for a secure connection, and allows for quick disassembly and replacement of the individual triangular components after wear. During installation, the guiding triangular device 8 is inserted into the connecting cylinder 15 inside the triangular base plate 7 via a connecting rod 22 fixed to one side. The magnetic block 23 at the end of the connecting rod 22 generates a magnetic attraction with the positioning magnetic block 16 on the inner wall of the connecting cylinder 15, axially pulling the connecting rod 22 to a preset position. This magnetic attraction achieves millimeter-level precision positioning, eliminating mechanical backlash. At this time, the slot 24 on the surface of the connecting rod 22 moves to the position of the top block 20. The spring 19 retracts and rebounds, embedding itself into the slot 24 to initially position the connecting rod 22. Then, the control module 34 controls the auxiliary power supply 26 to energize the positioning magnet 16 and the electromagnetic module 21. After connection, the electromagnetic module 21 generates a reverse magnetic field, creating a magnetic repulsion force that pushes the permanent magnet at the telescopic end of the telescopic cylinder 18 outwards, thereby pushing the top block 20 outwards from the movable slot 17. This increases the tightness of the connecting rod 22. The spring force of the spring 19, combined with the double fixation of the electromagnetic module, ensures the connection strength of the guide triangle device 8. Simultaneously, the magnetic poles between the positioning magnet 16 and the electromagnetic module 21 remain opposite, and the electromagnetic module 21 generates a magnetic repulsion force while simultaneously positioning the connecting rod 22. The positioning magnetic block 16 generates a magnetic attraction force, thereby further fixing the guide triangle device 8. When the guide triangle device 8 is worn and needs to be replaced, the control module 34 controls the magnetic pole conversion between the positioning magnetic block 16 and the electromagnetic module 21. The electromagnetic module 21 is energized to generate a positive magnetic field, which attracts the permanent magnet at the telescopic end of the telescopic cylinder 18 to retract, thereby driving the top block 20 to retract into the movable groove 17, so that the top block 20 moves out of the slot 24. At this time, the spring 19 is compressed and stored energy. At the same time, the electromagnetic module 21 converts the magnetic pole to form a magnetic repulsion force on the magnetic attraction block 23, thereby pushing the automatic connecting rod 22, which is not fixedly connected, out a certain distance, thereby realizing the quick disassembly and replacement of the guide triangle device 8.

[0054] The pressure sensor 25 monitors the force exerted by the needle heel on the triangular working surface in real time. Based on the force signal, the electromagnetic strength of the positioning magnetic block 16 and the electromagnetic module 21 is dynamically adjusted to ensure the stability of the operation. At the same time, the angle offset of the guide triangular device 8 and the speed of the pull roller are adjusted in real time according to the pressure. The force exerted by the needle heel on the triangular working surface is reduced by adjusting the guide triangular device 8 by ±0.5°, thereby reducing the wear of the machine parts. The pulse command generated based on the force exerted by the needle heel on the triangular working surface drives the servo motor 32. The servo motor 32 drives the worm gear 31 to rotate. The rotation of the worm gear 31 drives the worm wheel 29 at the end of the drive shaft 28 to rotate, thereby driving the drive shaft 28 to adjust the angle between the connecting cylinder 15 and achieve dynamic control of the weaving accuracy.

[0055] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-precision double-sided circular knitting machine, comprising a housing (1), characterized in that: A frame (2) is fixedly installed on the outside of the housing (1). A support ring (3) is installed on the top of the frame (2). A support column (4) is fixedly installed on the upper end of the support ring (3). A yarn guide frame (5) is provided on the upper end of the support column (4). A yarn connecting frame (6) is installed on the inner side of the yarn guide frame (5). A triangular base plate (7) is provided on the inner side of the yarn guide frame (5). A guide triangle device (8) is provided on the surface of the triangular base plate (7). The guide triangle device (8) includes a guide needle triangle (9), a forward density triangle (10), a herringbone triangle (11), a reverse density triangle (12), and a guide triangle (13).

2. The high-precision double-sided circular knitting machine according to claim 1, characterized in that: A guide triangle (9) is provided on one side of the surface of the triangular base plate (7). A positive density triangle (10) is provided on one side of the guide triangle (9). A herringbone triangle (11) is provided on one side of the positive density triangle (10). A reverse density triangle (12) is provided on the side of the herringbone triangle (11) away from the positive density triangle (10). A guide triangle (13) is provided on the side of the reverse density triangle (12). The guide triangle (9), positive density triangle (10), herringbone triangle (11), reverse density triangle (12) and guide triangle (13) cooperate with each other to form a triangular track.

3. The high-precision double-sided circular knitting machine according to claim 2, characterized in that: The triangular base plate (7) and the guide triangular device (8) are fixedly connected by a connecting assembly (14). The connecting assembly (14) includes a connecting cylinder (15), a positioning magnetic block (16), a movable groove (17), a telescopic cylinder (18), a spring (19), a top block (20), and an electromagnetic module (21). The connecting cylinder (15) is embedded inside the triangular base plate (7), and the connecting cylinder (15) and the triangular base plate (7) are movably connected by a bearing. The positioning magnetic block (16) is fixedly connected to the inner wall end of the connecting cylinder (15). The inner walls of both sides of the connecting cylinder (15) are provided with movable grooves (17). The inner wall of the movable groove (17) is fixedly connected to a telescopic cylinder (18). The telescopic end of the telescopic cylinder (18) is a permanent magnet. The outer wall of the telescopic cylinder (18) is fitted with a spring (19). The telescopic end of the telescopic cylinder (18) is fixedly connected to a top block (20). One end of the spring (19) is also connected to the top block (20). One end of the top block (20) extends to the outside of the movable groove (17). An electromagnetic module (21) is provided at the end of the movable groove (17).

4. The high-precision double-sided circular knitting machine according to claim 3, characterized in that: The connecting assembly (14) further includes a connecting rod (22), a magnetic block (23), and a slot (24). The connecting rod (22) is fixedly connected to the guide triangle device (8). The connecting rod (22) is embedded in the connecting cylinder (15). The end of the connecting rod (22) is fixedly connected to the magnetic block (23). The magnetic block (23) matches the positioning magnetic block (16). The outer walls on both sides of the middle part of the connecting rod (22) are provided with slots (24). The slots (24) match the top block (20), and the top block (20) is embedded in the slots (24).

5. The high-precision double-sided circular knitting machine according to claim 4, characterized in that: The positioning magnetic block (16) is an electromagnet. The outer wall of the connecting rod (22) is provided with a pressure sensor (25). The pressure sensor (25) is provided in multiple sets and is arranged at equal intervals. An auxiliary power supply (26) is provided on one side of the triangular base plate (7). The auxiliary power supply (26) is electrically connected to the positioning magnetic block (16) and the electromagnetic module (21) respectively.

6. The high-precision double-sided circular knitting machine according to claim 5, characterized in that: An angle offset component (27) is provided on one side of the connecting cylinder (15). The angle offset component (27) includes a drive shaft (28), a worm gear (29), a fixed frame (30), a worm (31), and a servo motor (32). One end of the connecting cylinder (15) is fixedly connected to the drive shaft (28). The end of the drive shaft (28) away from the connecting cylinder (15) passes through the triangular base plate (7) and is connected to the worm gear (29). The outer wall of the side of the triangular base plate (7) away from the guide triangular device (8) is fixedly connected to the fixed frame (30). Multiple sets of fixed frames (30) are provided and are matched with the guide triangular device (8).

7. The high-precision double-sided circular knitting machine according to claim 6, characterized in that: The inner wall of the middle part of the fixed frame (30) is connected to a worm (31) through a bearing. The worm (31) meshes with a worm wheel (29). A servo motor (32) is fixedly connected to one side of the outer wall of the fixed frame (30). The output end of the servo motor (32) is connected to the worm (31), and a brake device is provided inside the servo motor (32).

8. The high-precision double-sided circular knitting machine according to claim 7, characterized in that: An angle encoder (33) is provided on one side of the servo motor (32). The angle encoder (33) is electrically connected to the servo motor (32). The angle encoder (33) provides real-time feedback on the rotation angle of the worm gear (29). A control module (34) is provided on one side of the housing (1).

9. The high-precision double-sided circular knitting machine according to claim 6, characterized in that: The edge of the guide triangle device (8) is arc-shaped, and the needle pressing section of the guide triangle device (8) is a concave curved surface, while the needle return section is a convex curved surface.

10. A method for controlling the weaving of a high-precision double-sided circular weft machine, using the high-precision double-sided circular weft machine described in any one of claims 1-9, characterized in that: The control compilation method includes the following steps: Step 1: Equipment self-test, angle encoder (33) returns to zero, servo motor (32) drives worm gear (31) to rotate to zero position, connection component (14) is powered on for testing, electromagnetic module (21) is powered on to verify telescopic cylinder (18) retraction response; Step 2: After the yarn passes through the yarn guide frame (5) and into the yarn connecting frame (6), it enters the entrance of the guide needle triangle (9). The needle heel moves along the track and first contacts the rising slope of the guide needle triangle (9). The needle heel is pushed inward by the slope and the needle rises vertically. The needle hook picks up the yarn. After the needle heel reaches the highest point of the triangle, the old loop slides down and opens the needle tongue. The new yarn forms a loop. When the needle heel enters the descending slope of the triangle, the needle is forced to pull down and close the needle tongue, thereby locking the new loop. The old loop comes out of the needle hook. The needle heel passes through the horizontal section of the triangle track and the needle remains in a low position, ready for the next loop forming cycle. Step 3: The pressure sensor (25) monitors the force exerted by the needle heel on the triangular working surface in real time. Based on the force signal, the electromagnetic strength of the positioning magnetic block (16) and electromagnetic module (21) is dynamically adjusted to ensure working stability. At the same time, the angle offset of the guide triangular device (8) and the speed of the pull roller are adjusted in real time according to the pressure. The force exerted by the needle heel on the triangular working surface is reduced by adjusting the guide triangular device (8) by ±0.5°, thereby reducing the wear of the machine parts. Step 4: Based on the force exerted by the needle heel on the triangular working surface, a pulse command is generated to drive the servo motor (32). The servo motor (32) drives the worm (31) to rotate. The rotation of the worm (31) drives the worm wheel (29) at the end of the drive shaft (28) to rotate, thereby driving the drive shaft (28) and the connecting cylinder (15) to adjust the angle, so as to realize the dynamic controllability of the weaving accuracy. Step 5: The angle encoder (33) samples the actual rotation angle of the servo motor (32) every 5ms, and controls the device through the control module (34).

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