High-precision cutting and feeding device and method for cutting bed

Abstract

The invention discloses a high-precision cutting and feeding device and method for a cutting bed, and relates to the technical field of numerical control cutting beds, the high-precision cutting and feeding device for the cutting bed comprises a driving unit, a feeding unit and a feeding unit, the driving unit comprises a servo motor and a planetary reducer connected with the servo motor; the transmission unit comprises a driving shaft and a driven shaft, the driving shaft is fixedly provided with a driving chain disc, an output shaft of the planetary reducer is in transmission connection with the driving chain disc, the driven shaft is rotationally connected with a driven chain disc, the driving chain disc is in transmission connection with the driven chain disc through a first chain, and the first chain is connected with a felt feeding platform; the detection feedback unit comprises a first encoder mounted on the driven shaft; and the control unit is electrically connected with the servo motor and the first encoder. According to the high-precision cutting and feeding device of the cutting bed, high-precision cutting, feeding and cutting can be achieved, and the cutting quality problem caused by mechanical transmission errors under heavy loads is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of numerical control cutting bed, and particularly relates to a high-precision cutting and feeding device and method of cutting bed. BACKGROUND

[0002] In the numerical control cutting bed equipment, the precision of the feeding system directly determines the quality of the final cutting product. The existing mainstream technology mostly adopts the scheme of "frequency converter + three-phase asynchronous motor + external encoder". The scheme detects the feeding displacement through the external encoder, and compensates for the error by adopting a closed-loop correction strategy, so that the feeding precision can be stabilized within ±2mm. However, the scheme has inherent defects such as insufficient control bandwidth, feedback link delay, and being easily affected by mechanical resonance. In particular, in the dynamic working condition of "cutting while walking" (synchronous feeding cutting), it is difficult for the feeding shaft and the cutting shaft of the machine head to realize high-precision synchronization, resulting in quality problems such as edge sawtooth and size out-of-tolerance of the cutting piece.

[0003] In addition, the mechanical transmission system (such as a chain transmission mechanism) will produce elastic deformation (such as about 0.5%-1.0% elastic elongation of the chain under the action of tensioning force) and mechanical clearance (about 0.5-1.0mm of idle stroke in the transition stage from relaxation to tensioning) under heavy load (such as a load of 500-1000N when the vacuum suction is turned on), which further introduces dynamic errors. Although some individual schemes attempt to use a servo motor to drive, only the built-in encoder of the motor is used to form a single closed-loop control, which cannot effectively compensate for the mechanical transmission error between the motor and the feeding platform, and the precision still cannot meet the requirements of high-end applications.

[0004] Therefore, there are still defects and deficiencies in the prior art, and how to provide a high-precision cutting and feeding device and method of cutting bed capable of dynamically compensating for mechanical transmission errors and realizing high-precision cutting is a technical problem to be solved by those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a high-precision cutting and feeding device and method of cutting bed, which solves the technical problems that the existing numerical control cutting bed equipment cannot dynamically compensate for mechanical transmission errors and cannot realize high-precision cutting.

[0006] To achieve the above-mentioned purpose, the present application provides a high-precision cutting and feeding device of cutting bed, comprising:

[0007] A driving unit, the driving unit comprising a servo motor and a planetary reducer connected with the servo motor;

[0008] A transmission unit, the transmission unit comprising a driving shaft and a driven shaft, the driving shaft being fixedly provided with a driving chain disc, the output shaft of the planetary reducer being transmission-connected to the driving chain disc, the driven shaft being rotationally connected to the driven chain disc, the driving chain disc and the driven chain disc being transmission-connected via a first chain, the first chain being connected to a felt feeding platform;

[0009] a detection feedback unit, the detection feedback unit comprising a first encoder mounted on the driven shaft;

[0010] A control unit is electrically connected to the servo motor and the first encoder.

[0011] Preferably, the driven shaft is fixedly provided with a fixing ring, the fixing ring is fixedly provided with an encoder seat, and the first encoder is fixedly provided on the encoder seat.

[0012] Preferably, the first encoder is connected to a gear shaft via a coupling, the gear shaft is rotatably connected to the encoder seat, one end of the gear shaft is connected to an encoder pinion, and the driven chain plate is fixed with an encoder gearwheel meshing with the encoder pinion.

[0013] Preferably, a mounting bracket is fixedly provided at the bottom of the encoder seat, a waist-shaped fixing hole is provided on one side of the mounting bracket, and the mounting bracket is detachably connected to the fixing ring by bolts.

[0014] Preferably, both ends of the driven shaft are fixed on a fixing seat.

[0015] Preferably, the encoder gearwheel is concentrically arranged with the driven chain disc.

[0016] The present invention also provides a high-precision cutting and feeding method for a cutting table, which is applied to the high-precision cutting and feeding device for a cutting table in any of the above technical solutions, comprising:

[0017] S1. Gap detection and elimination phase before feeding begins: Send microstep pulse commands to the servo motor and monitor the change in the first encoder. If the change in the first encoder feedback is lower than the threshold, it is determined that there is a mechanical gap. At this time, compensation pulses are continuously sent until the change in the first encoder feedback exceeds the above threshold;

[0018] S2. Synchronous feeding compensation stage: During the feeding process, the synchronous offset is calculated based on the actual displacement and real-time load feedback from the first encoder, and the offset is superimposed on the cutting motion command of the machine head in real time;

[0019] S3. After the feeding stops, the servo motor maintains a certain torque, the displacement value of the felt feeding platform is obtained according to the pulses of the first encoder in real time, and the position of the cutting shaft of the machine head is compensated and corrected in real time according to the displacement value.

[0020] Preferably, in the gap detection and elimination stage before the feeding starts, the micro-step pulse is 10 fpps, and the threshold value is that the change of the first encoder is 3 rpps within 10 ms.

[0021] Preferably, in the dynamic correction stage after the feeding stops, the pulses of the first encoder are obtained in real time by the motion controller, and the pulse signal of the first encoder is processed by using the mean filtering algorithm.

[0022] Preferably, in the dynamic correction stage after the feeding stops, the torque maintained by the servo motor is 25%-35% of the rated torque.

[0023] With respect to the above background technology, the cutting bed high-precision cutting feeding device provided by the present application has the following advantages: the first encoder is installed on the driven shaft, the servo motor drives the driven chain disc on the driven shaft to rotate through the driving shaft and the first chain, and the first encoder can feed back the displacement data of the felt feeding platform in real time. The mechanical gap is eliminated by the servo motor and the first encoder installed on the driven shaft before the feeding starts, the transmission precision is improved, the cutting motion instruction of the machine head is superimposed with a synchronous offset in real time during the feeding stage, the deformation of the transmission structure is compensated, the synchronization effect of cutting while walking is ensured, the displacement value of the felt feeding platform is obtained according to the pulses of the first encoder in real time after the feeding stops, the position of the cutting shaft of the machine head is compensated and corrected in real time, and thus high-precision cutting feeding and cutting are realized, and the cutting quality problem caused by mechanical transmission error under heavy load is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0025] Figure 1 The structure diagram of the cutting bed high-precision cutting feeding device provided by the embodiment of the present application;

[0026] Figure 2 The partial structure diagram of the cutting bed high-precision cutting feeding device provided by the embodiment of the present application;

[0027] Figure 3The installation schematic view of the detection feedback unit provided by the embodiment of the present application;

[0028] Figure 4 The installation schematic view of the detection feedback unit provided by the embodiment of the present application from another perspective;

[0029] Figure 5 The structural schematic view of the detection feedback unit provided by the embodiment of the present application;

[0030] Figure 6 The sectional view of the detection feedback unit provided by the embodiment of the present application;

[0031] Figure 7 The flow schematic view of the high-precision cutting and feeding method of the cutting bed provided by the embodiment of the present application.

[0032] Figures 1 to 7 Reference signs: 1, driving unit; 11, servo motor; 12, planetary reducer; 2, transmission unit; 21, driving shaft; 211, driving chain disc; 212, first chain; 213, power chain disc; 214, second chain; 22, driven shaft; 221, driven chain disc; 222, encoder large gear; 223, fixed seat; 3, felt feeding platform; 4, detection feedback unit; 41, first encoder; 42, fixed ring; 43, encoder seat; 431, bearing retainer; 44, shaft coupling; 45, gear shaft; 451, encoder pinion; 452, limit nut; 46, mounting bracket; 461, waist-shaped fixed hole. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0034] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0035] The present application provides a cutting bed high-precision cutting and feeding device and method. The servo motor 11 provides precise driving control for the feeding action by virtue of its high dynamic response characteristics. The synchronous phase compensation is based on a motion control algorithm, which monitors and corrects the phase deviation between the cutting shaft and the feeding shaft in real time, so as to ensure that the two shafts remain synchronized during dynamic operation. The first encoder 41 serves as a core feedback element, which feeds back the feeding displacement data in real time with high-precision pulse signals, thereby ensuring cutting precision.

[0036] Please refer toFigures 1 to 6 The cutting bed high-precision cutting feeding device provided by the application comprises:

[0037] The driving unit 1 comprises a servo motor 11 and a planetary reducer 12 connected with the servo motor 11.

[0038] The transmission unit 2 comprises a driving shaft 21 and a driven shaft 22, the driving shaft 21 is fixedly provided with a driving chain disc 211, the output shaft of the planetary reducer 12 is in transmission connection with the driving chain disc 211, the driven shaft 22 is rotationally connected with a driven chain disc 221, the driving chain disc 211 is in transmission connection with the driven chain disc 221 through a first chain 212, and the first chain 212 is connected with a felt feeding platform 3.

[0039] The detection feedback unit 4 comprises a first encoder 41 installed on the driven shaft 22.

[0040] The control unit is electrically connected with the servo motor 11 and the first encoder 41.

[0041] The cutting bed high-precision cutting feeding device further comprises a machine head for cutting and cutting cloth, when the cutting bed high-precision cutting feeding device is used, the cloth is borne through the felt feeding platform 3, the servo motor 11 is started, the servo motor 11 drives the driving shaft 21 to rotate through the planetary reducer 12, the driving shaft 21 drives the driven chain disc 221 to rotate through the driving chain disc 211 and the first chain 212, the felt feeding platform 3 rigidly connected to the first chain 212 moves forward along with the first chain 212, the first encoder 41 in the detection feedback unit 4 is installed on the driven shaft 22, and the displacement data of the felt feeding platform 3 is fed back in real time through the first encoder 41.

[0042] In order to ensure cutting precision, the control unit is configured to perform the following operations:

[0043] Before feeding starts, the servo motor 11 is controlled to run at a micro-step pulse until an effective change of the feedback value of the first encoder 41 is detected, so as to eliminate transmission clearance;

[0044] During feeding, according to the actual displacement and real-time load parameters fed back by the first encoder 41, a synchronous compensation offset is calculated, and the offset is superimposed on the control instruction of the cutting shaft of the machine head;

[0045] After feeding stops, the position of the cutting shaft of the machine head is dynamically fine-tuned and corrected according to the displacement signals continuously fed back by the first encoder 41.

[0046] In this way, mechanical transmission errors can be effectively eliminated, real-time responses and compensation of deformation caused by load changes can be made, and cutting precision can be ensured.

[0047] In addition, the main shaft 21 is further fixedly provided with a power chain disc 213, and an output shaft of the planetary reducer 12 is in transmission connection with the power chain disc 213 through a second chain 214. The planetary reducer 12 drives the power chain disc 213 to rotate through the second chain 214, so that the main driving chain disc 211 on the main shaft 21 rotates. Optionally, in the embodiment, the rated torque of the servo motor 11 is 4.3 Nm, the maximum rotating speed is 3000 r / min, and the reduction ratio of the planetary reducer 12 is 1:80. The first chain 212 and the second chain 214 can adopt a 16A double-pitch roller chain in the ISO 606 standard, the pitch is 19.05 mm, the ultimate tensile load is 31.1 kN, and the transmission stiffness under heavy load is ensured. The felt feeding platform 3 is rigidly connected with the first chain 212 through a special fixture to form a continuous conveying structure. The felt adopts a high-density needling process, and the surface friction coefficient is greater than or equal to 0.6, so that reliable adsorption and conveying of the cutting piece are ensured.

[0048] In some embodiments, please refer to Figures 3 to 6 The driven shaft 22 is fixedly provided with a fixing ring 42, the fixing ring 42 is fixedly provided with an encoder seat 43, and the first encoder 41 is fixedly arranged on the encoder seat 43.

[0049] In some embodiments, please refer to Figures 3 to 6 The first encoder 41 is connected with a gear shaft 45 through a shaft coupling 44, the gear shaft 45 is in rotation connection with the encoder seat 43, one end of the gear shaft 45 is connected with an encoder pinion 451, and the driven chain disc 221 is fixedly provided with an encoder gear 222 which is in meshing connection with the encoder pinion 451.

[0050] The main shaft 21 drives the driven chain disc 221 to rotate through the main driving chain disc 211 and the first chain 212, the driven chain disc 221 is in rotation connection with the driven shaft 22 through a bearing, the driven shaft 22 does not rotate by itself, the driven chain disc 221 drives the encoder gear 222 to rotate, the gear shaft 45 rotates through the meshing of the encoder gear 222 and the encoder pinion 451, the first encoder 41 is connected with the gear shaft 45 through the shaft coupling 44, so that the shaft of the first encoder 41 can be driven to rotate, the displacement of the first chain 212 can be obtained through analysis and calculation of the encoder signal, and the displacement of the felt feeding platform 3 fixed on the first chain 212 can be obtained, and feeding displacement data can be fed back in real time.

[0051] The first encoder 41 is connected with the gear shaft 45 through the shaft coupling 44, the encoder pinion 451 on the gear shaft 45 is in meshing connection with the encoder gear 222, the first encoder 41 is not directly stressed, is not easy to be damaged, and the reading of the first encoder 41 is not easy to be affected by gear bounce.

[0052] The retaining ring 42 is annular and comprises two semi-circular components that can be connected as one. When in use, the retaining ring 42 is first placed on the driven shaft 22. After adjusting the distance between the encoder pinion 451 and the encoder gear 222 along the axial direction of the driven shaft 22, the encoder pinion 451 and the encoder gear 222 are meshed and then secured.

[0053] In addition, the gear shaft 45 is rotatably connected to the encoder seat 43 via a bearing. A bearing retaining ring 431 is provided on one side of the bearing. By providing the bearing retaining ring 431, the bearing can be accurately axially positioned and fixed, preventing the bearing from unnecessary axial movement. The gear shaft 45 is provided with an external thread on the side close to the coupling 44. The gear shaft 45 is connected to a limit nut 452 via the external thread. After tightening the limit nut 452, it can be pressed against the inner ring of the bearing. The bearing retaining ring 431 and the limit nut 452 are located on both sides of the bearing. The bearing retaining ring 431 and the limit nut 452 cooperate to accurately axially position and fix the gear shaft 45, thereby locking the entire gear shaft 45 in the axial position and preventing any undesirable axial movement.

[0054] In some embodiments, please refer to Figures 3 to 6 A mounting bracket 46 is fixed to the bottom of the encoder seat 43 , and a waist-shaped fixing hole 461 is provided on one side of the mounting bracket 46 . The mounting bracket 46 is detachably connected to the fixing ring 42 by bolts.

[0055] Mounting bracket 46 is L-shaped, with waist-shaped fixing holes 461 on one side of mounting bracket 46 connected to fixing ring 42, and on the other side connected to encoder base 43. When mounting bracket 46 is connected to fixing ring 42, bolts pass through the waist-shaped fixing holes 461 to securely connect to fixing ring 42. By adjusting the position of mounting bracket 46 so that bolts pass through different positions of waist-shaped fixing holes 461 to connect to fixing ring 42, the distance between encoder pinion 451 and encoder gear 222 can be changed, causing encoder pinion 451 to be pressed and meshed with encoder gear 222. This arrangement provides a more stable signal from first encoder 41, and since the pressing force does not act directly on the shaft of first encoder 41, the service life of first encoder 41 is extended.

[0056] In some embodiments, please refer to Figures 3 to 4 Both ends of the driven shaft 22 are fixed on the fixing seat 223 .

[0057] Both ends of the driven shaft 22 are fixed to the fixing seat 223 by bolts. After being fixed by the bolts, the driven shaft 22 is ensured to be fixed, which not only ensures a reliable connection but also facilitates subsequent disassembly and maintenance.

[0058] In some embodiments, please refer to Figures 3 to 4The encoder large gear 222 is coaxially arranged with the driven chain disc 221.

[0059] The coaxial arrangement makes the rotary motions of the encoder large gear 222 and the driven chain disc 221 completely synchronized, so that the first encoder 41 can reflect the real position of the felt feeding platform 3 without distortion, ensuring the cutting accuracy of the cloth.

[0060] Please refer to Figure 7 In addition to the cutting bed high-precision cutting feeding device disclosed in the above embodiments, the present application also provides a cutting bed high-precision cutting feeding method, which is applied to the cutting bed high-precision cutting feeding device disclosed in any of the above embodiments, and comprises the following steps:

[0061] S1. Gap detection and elimination stage before feeding starts: send micro-step pulse instructions to the servo motor 11, and monitor the change amount of the first encoder 41; if the change amount fed back by the first encoder 41 is lower than a threshold value, it is judged that there is mechanical gap, at this time, continue to send compensation pulses until the change amount fed back by the first encoder 41 is higher than the threshold value;

[0062] S2. Synchronous feeding compensation stage: during the feeding process, calculate the synchronous offset according to the actual displacement and real-time load fed back by the first encoder 41, and superimpose the offset with the head cutting motion instruction in real time;

[0063] S3. Dynamic correction stage after feeding stops: after the feeding stops, the servo motor 11 maintains a certain torque, obtains the displacement value of the felt feeding platform 3 according to the pulses of the first encoder 41 obtained in real time, and corrects the position of the head cutting shaft in real time according to the displacement value.

[0064] In some embodiments, in the gap detection and elimination stage before feeding starts, the micro-step pulse is 10fpps, and the threshold value is that the change amount of the first encoder 41 within 10ms is 3rpps.

[0065] When the change amount fed back by the first encoder 41 within 10ms is less than 3rpps, it is determined that there is mechanical gap in the transmission system, and when the change amount fed back by the first encoder 41 within 10ms is greater than 3rpps, the mechanical gap is eliminated.

[0066] Wherein, fpps and rpps are terms used to measure and describe the tiny displacement in high-precision motion control. fpps stands for Feedback Pulses Per Second, which means the frequency of the command pulse sent to the servo motor 11. 10 fpps means 10 pulse commands are sent to the servo motor 11 per second. Rpps stands for Received Pulses Per Second, which means the pulse frequency actually fed back by the external encoder (such as the first encoder 41). 3 rpps means 3 pulses are fed back by the external encoder per second.

[0067] In some embodiments, in the dynamic correction stage after the feeding stops, the pulses of the first encoder 41 are acquired in real time by the motion controller, and the mean filtering algorithm is used to process the pulse signal of the first encoder 41.

[0068] In some embodiments, in the dynamic correction stage after the feeding stops, the torque maintained by the servo motor 11 is 25%-35% of the rated torque.

[0069] Specifically, the high-precision cutting feeding method of the cutting bed will be described in detail as follows:

[0070] 1. Gap detection and elimination stage before feeding starts:

[0071] The control unit sends servo pulses to the servo motor 11 at a step size of 10 fpps (about 0.06 mm) while scanning the first encoder 41 for corresponding pulse feedback. When the encoder pulse value changes by less than 3 rpps (about 0.06 mm) within 10 ms, it is determined that there is mechanical gap. At this time, the servo pulse compensation command with a step size of 10 fpps should be continued to be sent until the pulse feedback of the first encoder 41 changes by more than 3 rpps within 10 ms. The gap detection and elimination stage usually occurs when the first batch of materials starts cutting. Since the servo motor 11 has been tensioned in the same direction during subsequent feeding, the gap is eliminated and is approximately 0. This stage does not require synchronous compensation as the cutting shaft of the machine head remains stationary.

[0072] 2. Synchronous feeding compensation stage:

[0073] In the feeding process, the control unit receives feedback data of the first encoder 41 in real time to monitor the actual displacement and load change of the feeding shaft. Based on the real-time load characteristics of the device (such as the current vacuum pressure, material weight, etc.), a dynamic synchronization offset is calculated through an adaptive algorithm. The offset is superimposed in real time with the ideal cutting motion trajectory (speed V1) of the head and the feeding motion trajectory (speed V2) to generate the final head cutting shaft composite motion instruction (V1 + V2 + offset) to compensate for the deformation generated in the power transmission process, ensure the accurate synchronization of cutting and feeding in the dynamic process, and ensure the cutting trajectory accuracy.

[0074] 3. Dynamic correction stage after feeding stops:

[0075] During the process from the start of feeding to the end of feeding, since a high vacuum adsorption needs to be maintained during the synchronous cutting process to ensure that the felt feeding platform 3 and the fabric do not displace during the feeding process, the active transmission mechanism will inevitably have some elastic deformation that has not recovered after the feeding ends. The servo motor 11 maintains a brake force of more than 50% of the rated torque during feeding, and maintains a brake force of about 30% of the rated torque after feeding stops to suppress displacement back caused by chain wheel deformation. As the vacuum negative pressure increases, the load decreases, and the deformation of the chain wheel caused by the previous high load begins to recover, causing the feeding to move forward in the original feeding direction.

[0076] In order to overcome the problem that the displacement of the felt feeding platform 3 is caused by the load decrease due to the deformation of the transmission mechanism under high load during the feeding process, the head performs real-time synchronous cutting during subsequent cutting according to the pulse feedback of the first encoder 41. First, the control unit receives and processes the feedback pulses of the first encoder 41 in real time through the motion controller (FPGA), and processes the feedback pulses using the mean filter algorithm to obtain the displacement value of the felt feeding platform 3 during dynamic cutting. Finally, the calculated displacement value is superimposed into the control instruction of the head cutting shaft for dynamic fine adjustment and correction.

[0077] In this way, the mechanical clearance is detected and eliminated before feeding starts, a synchronization offset is superimposed in real time to the cutting motion instruction of the head during the feeding stage to compensate for the deformation of the transmission structure, the synchronization effect of cutting while walking is ensured, the displacement value of the felt feeding platform 3 is obtained according to the real-time pulse of the first encoder 41 after the feeding stops, and the position of the head cutting shaft is compensated and corrected in real time, thereby realizing high-precision cutting and feeding of the cutting bed.

[0078] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0079] The principles and implementation methods of the present invention are described herein using specific examples. The description of the above examples is only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A high-precision cutting and feeding device for a cutting bed, characterized in that: include: A drive unit (1), the drive unit (1) comprising a servo motor (11) and a planetary reducer (12) connected to the servo motor (11); A transmission unit (2), the transmission unit (2) comprising a driving shaft (21) and a driven shaft (22), the driving shaft (21) being fixedly provided with a driving chain disc (211), the output shaft of the planetary reducer (12) being transmission-connected to the driving chain disc (211), the driven shaft (22) being rotationally connected to the driven chain disc (221), the driving chain disc (211) and the driven chain disc (221) being transmission-connected via a first chain (212), the first chain (212) being connected to a felt feeding platform (3); A detection feedback unit (4), the detection feedback unit (4) comprising a first encoder (41) mounted on the driven shaft (22); A control unit is electrically connected to the servo motor (11) and the first encoder (41).

2. The high-precision cutting and feeding device for a cutting bed according to claim 1, characterized in that: The driven shaft (22) is fixedly provided with a fixing ring (42), the fixing ring (42) is fixedly provided with an encoder seat (43), and the first encoder (41) is fixedly provided on the encoder seat (43).

3. The high-precision cutting and feeding device for a cutting bed according to claim 2, characterized in that: The first encoder (41) is connected to a gear shaft (45) via a coupling (44); the gear shaft (45) is rotatably connected to the encoder seat (43); one end of the gear shaft (45) is connected to an encoder pinion (451); and the driven chain disc (221) is fixed with an encoder large gear (222) meshing with the encoder small gear (451).

4. The high-precision cutting and feeding device for a cutting bed according to claim 3, characterized in that: A mounting bracket (46) is fixedly provided at the bottom of the encoder seat (43), a waist-shaped fixing hole (461) is provided on one side of the mounting bracket (46), and the mounting bracket (46) is detachably connected to the fixing ring (42) via bolts.

5. The high-precision cutting and feeding device for a cutting bed according to claim 1, characterized in that: Both ends of the driven shaft (22) are fixed to the fixing seat (223).

6. The high-precision cutting and feeding device for a cutting bed according to claim 3, characterized in that: The encoder gear (222) is concentrically arranged with the driven chain disc (221).

7. A high-precision cutting and feeding method for a cutting machine, applied to a high-precision cutting and feeding device for a cutting machine as claimed in any one of claims 1 to 6, characterized in that: include: S1. Gap detection and elimination phase before feeding starts: sending micro-step pulse instructions to the servo motor (11) and monitoring the change of the first encoder (41). If the change of the feedback of the first encoder (41) is lower than the threshold, it is determined that there is a mechanical gap. At this time, the compensation pulse is continuously sent until the change of the feedback of the first encoder (41) is higher than the above threshold; S2 synchronous feeding compensation stage: During the feeding process, the synchronous offset is calculated based on the actual displacement and real-time load feedback of the first encoder (41), and the offset is superimposed with the cutting motion instruction of the machine head in real time; S3. Dynamic correction stage after feeding stops: After feeding stops, the servo motor (11) maintains a certain torque, obtains the displacement value of the felt feeding platform (3) based on the pulse of the first encoder (41) obtained in real time, and performs real-time compensation correction on the position of the cutting axis of the machine head based on the displacement value.

8. The high-precision cutting and feeding method for a cutting bed according to claim 7, characterized in that: In the gap detection and elimination stage before the start of feeding, the micro-step pulse is 10fpps, and the threshold is that the change of the first encoder (41) within 10ms is 3rpps.

9. The high-precision cutting and feeding method for a cutting bed according to claim 7, characterized in that: In the dynamic correction stage after feeding stops, the pulse of the first encoder (41) is acquired in real time by the motion controller, and the pulse signal of the first encoder (41) is processed by a mean filter algorithm.

10. The high-precision cutting and feeding method for a cutting bed according to claim 7, characterized in that: In the dynamic correction stage after feeding stops, the servo motor (11) maintains a torque of 25%-35% of the rated torque.

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