Multi-axis linkage error correction device for numerical control machine tool

Abstract

The utility model belongs to the technical field of multi-axis numerical control machine tool correction, and discloses a numerical control machine tool multi-axis linkage error correction device, which comprises a verification laser light source, a forward signal receiving plate, a lateral signal receiving plate and an opposite signal receiving plate, and is characterized in that the verification laser light source comprises a machine tool matching part, a circuit assembly part and a coding laser part; the machine tool matching part comprises a lock head, a matching cone, a clamping ring and a clamping groove, the coding laser part comprises a structural square block and a plurality of groups of coding laser light sources, and the coding laser light sources emit coding patterns. Detection values and preset coordinates of the machine tool can be used for proofreading, the machine tool can be calibrated and corrected, the device is wide in application range and suitable for most machine tools, optical positioning is adopted in the device, precision is high, the motion posture can be detected, and the machine tool can be better corrected.

Description

TECHNICAL FIELD

[0001] The utility model relates to multi -shaft numerical control machine tool correction technical field, concretely is a numerical control machine tool multi -shaft linkage error correction device. BACKGROUND

[0002] The patent document with the Chinese patent publication number CN219403304U was granted on July 25, 2023. It discloses a correction mechanism for a numerical control machine tool. The application includes a platform plate, which has two support frames installed for supporting workpieces. The support frames are equipped with electric cylinders for pushing. The top of the platform plate is installed with a base between the two support frames. The base is installed with a laser calibration instrument. The electric cylinders are controlled by the laser calibration instrument. By setting the laser calibration instrument that can control the lifting of the support frames, the support frames of the workpieces are stabilized at the same height to adjust the position of the workpieces and prevent the position of the workpieces from deviating during processing. By setting a laser sensor switch, the two support frames are controlled to maintain the same initial height to prevent the support frames from being too high or too low. The height of the support frames is automatically adjusted, saving time for manual adjustment and greatly improving the efficiency of production and processing.

[0003] According to the related technology in the above, the inventors believe that there are the following defects: the invention fixes the workpiece and adjusts the position of the workpiece to compensate and correct, so as to make the relative position of the workpiece and the machine tool in the ideal coordinate system. The existing high-precision machine tool has error correction function, without the need to compensate and correct by changing the position of the workpiece. Most machine tools have tool setting function, which can automatically align the tool and the workpiece. It is impossible to compensate and correct by changing the position of the workpiece, and this method only corrects the single fixed posture, which cannot solve the error of the moving posture.

[0004] In actual processing, the tool and the workpiece of the machine tool are in a state of constant motion, and the error of the moving posture has a great influence on the processing accuracy. The existing fixed posture calibration method cannot monitor and calibrate the posture error of the machine tool in the motion process in real time, which makes it difficult to meet the manufacturing requirements of high-precision products.

[0005] The existing correction device also has deficiencies in applicability. With the development of manufacturing industry, multi-axis machine tools are increasingly widely used, from common three-axis, four-axis, five-axis machine tools to more complex six-axis or even more-axis machine tools. Different types of multi-axis machine tools have different structures and motion characteristics. However, the existing correction device is often difficult to adapt to a variety of different types of multi-axis machine tools. These devices may only be designed for specific types of machine tools and cannot effectively correct the errors of other types of multi-axis machine tools. This makes enterprises need to equip multiple different correction devices when using different types of multi-axis machine tools, increasing production cost and management difficulty.

[0006] In summary, the existing numerical control machine tool error correction method and device cannot calibrate the motion posture and is difficult to adapt to various multi-axis machine tools. Therefore, it is of great practical significance to develop an error correction device that can effectively calibrate the motion posture of the machine tool and is suitable for various types of multi-axis machine tools. This new device will be able to monitor and correct errors in real time during the movement of the machine tool, improve the machining precision and stability of the machine tool, and meet the demand for high-precision machining in modern manufacturing. Content of the utility model

[0007] (1) Technical problems solved

[0008] In view of the deficiencies of the prior art, the numerical control machine tool multi-axis linkage error correction device is provided to solve the problems of the existing device that cannot detect the motion posture and is not suitable for various types of multi-axis machine tools as mentioned in the background technology.

[0009] (2) Technical solutions

[0010] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a numerical control machine tool multi-axis linkage error correction device, characterized by comprising:

[0011] A verification laser light source is fixedly installed at the tool edge of the machine tool spindle and replaces the turning tool, used to emit a coded laser signal to realize coordinate positioning function.

[0012] A forward signal receiving plate is fixedly installed on the front face of the machine tool, used to receive the coded laser signal on the front face to realize coordinate and posture detection function.

[0013] A lateral signal receiving plate is fixedly installed on the side face of the machine tool, and the lateral signal receiving plate is perpendicular to the forward signal receiving plate, used to receive the coded laser signal on the side face to realize coordinate and posture detection function.

[0014] A counter signal receiving plate is fixedly installed at the blank material of the machine tool, and the counter signal receiving plate faces the verification laser light source, used to receive the coded laser signal from the opposite direction to realize axial detection of the turning tool, as well as coordinate and posture detection function.

[0015] Preferably, the verification laser light source comprises a machine tool matching part, a circuit assembly part and a coded laser part, the verification laser light source is fixedly installed at the tool edge of the machine tool through the machine tool matching part, the coded laser part is arranged on the side of the machine tool matching part away from the machine tool, and the circuit assembly part for driving the coded laser part to operate is arranged between the machine tool matching part and the coded laser part.

[0016] Preferably, the machine tool matching part comprises a lock head, a matching cone, a clamping ring and a clamping groove, the matching cone is a conical block structure corresponding to the machine tool, the lock head is arranged at the top of the matching cone, the clamping ring is arranged on the side of the matching cone away from the lock head, the clamping groove is arranged on the side of the clamping ring away from the matching cone, and two groups of opposite positioning notches are arranged on the clamping ring.

[0017] Preferably, the circuit assembly part comprises a cylindrical structure cylinder, a battery and a circuit assembly, the cylindrical structure cylinder is arranged on the side of the clamping ring away from the matching cone, and the battery and the circuit assembly are fixedly installed in the cylindrical structure cylinder.

[0018] Preferably, the coding laser part comprises a structure square and a plurality of groups of coding laser light sources, the structure square is arranged on the side of the cylindrical structure cylinder away from the clamping ring, the structure square is a square block structure, the side of the structure square away from the cylindrical structure cylinder is a C face, the adjacent two faces of the C face are respectively an A face and a B face, the A face, the B face and the C face are perpendicular to each other, and the coding laser light sources are arranged on the A face, the B face and the C face.

[0019] Preferably, the coding laser light source comprises a plurality of groups of laser generators, the plurality of groups of laser generators are arranged in a dot matrix mode, and the plurality of groups of laser generators form a coding pattern.

[0020] Preferably, a plurality of groups of dot matrix arranged photoelectric signal receivers are arranged on the forward signal receiving plate, the lateral signal receiving plate and the opposite signal receiving plate.

[0021] (Three) beneficial effects

[0022] Compared with the prior art, the utility model provides a numerical control machine tool multi -axis linkage error correction device has the following beneficial effects:

[0023] 1. The numerical control machine tool multi -axis linkage error correction device is provided with check laser light source, forward signal receiving plate, lateral signal receiving plate and opposite signal receiving plate and other structures, can be used for a variety of types of machine tool movement coordinate high -precision positioning detection, can use detection value and machine tool preset coordinate to check, can calibrate the machine tool, and the device is very extensive, is suitable for most machine tools, and the device adopts optical positioning, and the precision is very high, can detect the movement posture, and it is convenient to better correct the machine tool.

[0024] 2. It is provided with check laser light source, can fix the installation on the machine tool lathe tool, check laser light source can emit laser light and cooperate detection positioning its coordinate and movement posture, can detect the position and posture of the lathe tool, and can detect the movement state of the lathe tool, and it is convenient to correct the error of the machine tool, and the optical positioning is used, and the precision is very high.

[0025] 3, provided with the opposite signal receiving plate, can replace the workpiece to be processed, detect the relative coordinates of the opposite signal receiving plate and the calibration laser light source can obtain the relative coordinates of the turning tool and the workpiece to be processed, can be applied to various machine tools such as feed type machine tools and feed type machine tools, can be used for common three-axis, four-axis and five-axis machine tool detection and correction and some six-axis linkage machine tools and other multi-axis complex machine tools, the application range is very wide. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a whole structure schematic view of the utility model;

[0027] Figure 2 It is a calibration laser light source schematic view of the utility model;

[0028] Figure 3 It is a coding laser part structure schematic view of the utility model;

[0029] Figure 4 It is a kind of coding pattern schematic view of the utility model.

[0030] In the drawing: 1, calibration laser light source;2, forward signal receiving plate;3, lateral signal receiving plate;4, opposite signal receiving plate;5, machine tool cooperation part;6, circuit assembly part;7, coding laser part;8, lock head;9, cooperation cone;10, snap ring;11, clamping groove;12, positioning notch;13, cylindrical structure cylinder;14, structure block;15, A face;16, B face;17, C face;18, coding laser light source;19, laser generator. DETAILED DESCRIPTION

[0031] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, apparently, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0032] Please refer to Figures 1-4 The utility model provides a kind of technical scheme:

[0033] A numerical control machine tool multi-axis linkage error correction device, characterized by comprising:

[0034] Calibration laser light source 1 is fixedly installed at machine tool spindle tool opening and replaces turning tool, is used to emit coding laser signal, realizes coordinate positioning function.

[0035] Forward signal receiving plate 2 is fixedly installed at the front of machine tool, is used to receive the coding laser signal of front, realizes coordinate and attitude detection function.

[0036] A lateral signal receiving plate 3 is fixedly installed on the side of the machine tool, and the lateral signal receiving plate 3 is perpendicular to the forward signal receiving plate 2, and is used for receiving the coded laser signal on the side to realize the coordinate and posture detection function.

[0037] A facing signal receiving plate 4 is fixedly installed at the blank material of the machine tool, and the facing signal receiving plate 4 faces the calibration laser light source 1, and is used for receiving the coded laser signal on the side to realize the axial detection of the turning tool, and the coordinate and posture detection function. The device can add a new set of 4 on the additional linear axis of some six-axis or more-axis machine tools.

[0038] Further, the calibration laser light source 1 comprises a machine tool matching part 5, a circuit assembly part 6 and a coded laser part 7, the calibration laser light source 1 is fixedly installed at the cutting edge of the machine tool through the machine tool matching part 5, the coded laser part 7 is arranged on the side away from the machine tool of the machine tool matching part 5, and the circuit assembly part 6 is arranged between the machine tool matching part 5 and the coded laser part 7 to drive the coded laser part 7 to operate.

[0039] Further, the machine tool matching part 5 comprises a lock head 8, a matching cone 9, a clamping ring 10 and a clamping groove 11, the matching cone 9 is a conical block structure corresponding to the machine tool, the lock head 8 is arranged at the top of the matching cone 9, the clamping ring 10 is arranged on the side away from the matching cone 9 of the lock head 8, the clamping groove 11 is arranged on the side away from the matching cone 9 of the clamping ring 10, and two groups of opposite positioning notches 12 are arranged on the clamping ring 10. The machine tool matching part 5 can be inserted into the turning tool mounting port of the machine tool spindle to replace the turning tool for installation, and the coordinate and motion posture of the calibration laser light source 1 are equivalent to the left side and motion posture of the turning tool.

[0040] Further, the circuit assembly part 6 comprises a cylindrical structure cylinder 13, a battery and a circuit assembly, the cylindrical structure cylinder 13 is arranged on the side away from the matching cone 9 of the clamping ring 10, and the battery and the circuit assembly are fixedly installed in the cylindrical structure cylinder 13. The circuit assembly is used to drive a plurality of laser generators 19 to form a coded pattern by turning on and off according to a specified scheme.

[0041] Further, the encoding laser part 7 comprises a structure block 14 and a plurality of sets of encoding laser light sources 18. The structure block 14 is arranged on the side of the cylindrical structure cylinder 13 away from the snap ring 10. The structure block 14 is a square block structure. The side of the structure block 14 away from the cylindrical structure cylinder 13 is provided with a C face 17. The adjacent two faces of the C face 17 are respectively provided with an A face 15 and a B face 16. The A face 15, the B face 16 and the C face 17 are perpendicular to each other. The A face 15, the B face 16 and the C face 17 are all provided with the encoding laser light sources 18. The A face 15, the B face 16 and the C face 17 conform to a three-dimensional space. The three-dimensional space corresponds to three axial directions. The coordinates and the rotation angle of each face are detected. The coordinates and the posture of the verification laser light source 1 in the three-dimensional space are obtained by combining the coordinates and the rotation angle. The motion posture can be detected during the movement.

[0042] Further, the encoding laser light source 18 comprises a plurality of sets of laser generators 19. The plurality of sets of laser generators 19 are arranged in a dot matrix mode with a size of 7x7. The plurality of sets of laser generators 19 form an encoding pattern. Different encoding patterns have different advantages. The size of 7x7 provides a variety of encoding modes and a variety of choices. A simple encoding pattern is recommended here. As shown in the figure, the encoding pattern is arranged in a cross shape. Four edges correspond to four directions respectively. The four edges are different from each other. The encoding signals are (1, 1, 1), (0, 1, 1), (1, 0, 1) and (1, 1, 0) respectively. The four edges can be distinguished. The included angle of the projection of each edge can be calculated by using a trigonometric function. The inclination angle and the plane position angle of the entire encoding surface can be judged. Figure 4

[0043] Further, the forward signal receiving plate 2, the lateral signal receiving plate 3 and the opposite signal receiving plate 4 are all provided with a plurality of sets of dot matrix arranged photoelectric signal receivers. It should be noted that the plurality of sets of dot matrix arranged photoelectric signal receivers are commercially available products. Therefore, they will not be described in detail. The photoelectric signal receivers are used to receive the encoding signals emitted by the verification laser light source 1. The received encoding patterns are all projections. Since the encoding pattern is pre-set and fixed, the rotation of the verification laser light source 1, i.e. the posture position, can be calculated by using a trigonometric function.

[0044] Structure description:

[0045] Verification laser light source 1: a key component fixed on the tool edge of the main shaft of the machine tool to replace the turning tool. The verification laser light source 1 emits encoding laser signals to realize coordinate positioning, assist in detecting the position and motion posture of the turning tool and the like.

[0046] Forward signal receiving plate 2: installed on the front of the machine tool. The forward signal receiving plate 2 receives the forward encoding laser signals to realize the detection of the coordinates and the posture of the machine tool.

[0047] ​Lateral signal receiving board 3: Installed on the side of the machine tool and perpendicular to the forward signal receiving board 2, it receives the coded laser signal from the side and is used to detect the machine tool coordinates and attitude;

[0048] Opposing signal receiving board 4: Fixed at the machine tool blank material and facing the verification laser source 1, it receives the opposing encoded laser signal to realize the detection of the cutting tool axis, coordinates and attitude, and is suitable for various machine tools;

[0049] Machine tool mating part 5: The structure for connecting the calibration laser source 1 to the machine tool, including locking head 8, mating cone 9, etc., used to securely install the calibration laser source 1 on the machine tool cutting edge;

[0050] Circuit assembly 6: Located between machine tool mating part 5 and coding laser part 7, it includes cylindrical structure cylinder 13, battery and circuit assembly, provides power for the operation of coding laser part 7, and drives laser generator 19 to form coding pattern;

[0051] Encoded laser unit 7: includes structural block 14 and multiple sets of encoded laser light sources 18. The encoded laser light sources 18 on its A side 15, B side 16, and C side 17 are used to emit encoded patterns to detect and verify the coordinates and attitude of the laser light source 1.

[0052] Lock head 8: Located at the top of the mating cone 9, it is the locking component connecting the machine tool mating part 5 to the machine tool, enhancing the stability of the installation of the verification laser source 1;

[0053] Matching cone 9: A conical block structure corresponding to the machine tool, which is a major component of the machine tool mating part 5 and assists in verifying the compatibility and installation of the laser source 1 with the machine tool;

[0054] Snap ring 10: Located on the side of the mating cone 9 away from the lock head 8, it mates with the snap groove 11 and the positioning notch 12, and is used to fix other components and assist in verifying the installation and positioning of the laser source 1;

[0055] Slot 11: Located on the side of the retaining ring 10 away from the mating cone 9, it is used to mate with other components for installation, ensuring the accuracy of the installation of the calibration laser source 1;

[0056] Positioning notch 12: Two sets of opposing notches are made on the retaining ring 10 for precise positioning to ensure that the installation position of the verification laser source 1 is correct;

[0057] Cylindrical structure tube 13: Located on the side of the retaining ring 10 away from the mating cone 9, it is the carrier of the circuit assembly section 6 and fixes the battery and circuit assembly inside.

[0058] Structural block 14: Located on the side of the cylindrical structure 13 away from the retaining ring 10, it is the main structure of the coding laser section 7, and coding laser light sources 18 are installed on different surfaces of it;

[0059] A face 15: one face of the structure block 14, perpendicular to B face 16 and C face 17, on which the coded laser light source 18 is arranged to emit coded patterns for detecting coordinates and posture;

[0060] B face 16: one face of the structure block 14, perpendicular to A face 15 and C face 17, on which the coded laser light source 18 is arranged to assist in detecting coordinates and posture of the calibration laser light source 1;

[0061] C face 17: one side face of the structure block 14, away from the cylindrical structure tube 13, perpendicular to A face 15 and B face 16, on which the coded laser light source 18 is arranged to participate in coordinate and posture detection;

[0062] Coded laser light source 18: distributed on A face 15, B face 16 and C face 17, composed of multiple groups of 7x7 dot matrix arranged laser generators 19, used for emitting coded patterns;

[0063] Laser generator 19: a component unit of the coded laser light source 18, arranged in 7x7 dot matrix, and forms different coded patterns by turning on and off according to the instructions of the circuit component part 6.

[0064] Working principle: The multi-axis linkage error correction device of the numerical control machine tool aims to accurately correct the multi-axis linkage error of the machine tool and improve the machining precision of the machine tool. Its working principle is based on the cooperation of the coded laser signal emitted by the verification laser source and multiple signal receiving plates, and the detection and correction of the machine tool coordinates, posture and motion state are realized through the reception and analysis of the signal. The verification laser source 1 is the core signal emitting component of the whole device. It is fixedly installed at the tool edge of the machine tool spindle and replaces the turning tool. Its structure includes a machine tool matching part 5, a circuit assembly part 6 and a coded laser part 7. The design of the machine tool matching part 5 enables it to closely cooperate with the machine tool spindle tool mounting port. Through the structures of the lock head 8, the matching cone 9, the clamping ring 10 and the clamping groove 11, the verification laser source 1 is stably installed at the machine tool tool edge, so that the detection of the coordinates and motion posture of the verification laser source 1 is equivalent to the detection of the turning tool. The circuit assembly part 6 provides power for the operation of the coded laser part 7. The battery and circuit assembly in the cylindrical structure cylinder 13 drive multiple groups of laser generators 19 to turn on and off according to the specified scheme, forming a specific encoding pattern. The coded laser part 7 is provided with coded laser light sources 18 on the A face 15, the B face 16 and the C face 17. Each coded laser light source 18 is composed of multiple groups of laser generators 19 arranged in a 7x7 dot matrix. This 7x7 magnitude setting provides multiple encoding methods, such as the recommended cross-shaped encoding pattern, whose four sides correspond to different directions, and the encoding signals are (1, 1, 1), (0, 1, 1), (1, 0, 1), (1, 1, 0) respectively, which can be used to distinguish the four sides. By calculating the included angle of the projected sides through the trigonometric function, the inclination angle and the plane position angle of the entire encoding surface can be judged. The front signal receiving plate 2 is fixedly installed on the front of the machine tool, the side signal receiving plate 3 is fixedly installed on the side of the machine tool and perpendicular to the front signal receiving plate 2, and the opposite signal receiving plate 4 is fixedly installed on the blank material of the machine tool and opposite to the verification laser source 1. Multiple groups of dot matrix arranged photoelectric signal receivers are arranged on the three signal receiving plates for receiving the coded laser signals emitted by the verification laser source 1. Since the encoding pattern is pre-fixed, the encoding pattern received by the signal receiving plate is a projection. The rotation of the projected light source, i.e. the verification laser source 1, can be calculated through the trigonometric function, that is, its attitude position. In the working process, the verification laser source 1 emits coded laser signals, which propagate in all directions. The front signal receiving plate 2 receives the front coded laser signals, the side signal receiving plate 3 receives the side coded laser signals, and the opposite signal receiving plate 4 receives the opposite coded laser signals. Through the reception and analysis of the coded laser signals in different directions, the device can realize the detection functions of the machine tool coordinates, posture and turning tool axial direction respectively. For example, by detecting the corresponding coordinates and rotation angles of the A face 15, the B face 16 and the C face 17 and combining them, the coordinates and posture of the verification laser source 1 in the three-dimensional space can be obtained. Moreover, during the machine tool motion, the detection can also be continuously performed, so as to obtain the motion posture.When the device is used for six-axis or more-axis machine tools, a new set of opposite signal receiving plates 4 can be added on its additional linear axis to adapt to more complex machine tool structures and movement forms. By comparing the detected coordinate and attitude information with the preset coordinates of the machine tool, the device can find the errors existing in the machine tool, and calibrate the machine tool according to the error information, thereby improving the machining precision of the machine tool and the product quality. In summary, the multi-axis linkage error correction device of the numerical control machine tool can realize accurate detection and correction of the multi-axis linkage error of the machine tool by verifying the coded laser signal emitted by the laser light source, and multiple signal receiving plates receive and analyze the signal, has the advantages of high precision, strong applicability, etc., and can meet the error correction needs of different types of machine tools.

[0065] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-axis linkage error correction device for CNC machine tools, characterized in that, include: Verify the laser source (1), which is fixedly installed at the machine tool spindle tool edge and replaces the cutting tool to emit coded laser signals and realize coordinate positioning function; A forward signal receiving board (2) is fixedly installed on the front of the machine tool to receive the coded laser signal from the front and realize coordinate and attitude detection functions. The side signal receiving board (3) is fixedly installed on the side of the machine tool, and the side signal receiving board (3) is perpendicular to the front signal receiving board (2). It is used to receive the coded laser signal from the side and realize the coordinate and attitude detection functions. The opposing signal receiving board (4) is fixedly installed at the machine tool blank material and faces the verification laser source (1) to receive the opposing coded laser signal, realize the axial detection of the cutting tool, as well as the coordinate and attitude detection functions.

2. The multi-axis linkage error correction device for CNC machine tools according to claim 1, characterized in that: The verification laser source (1) includes a machine tool mating part (5), a circuit assembly part (6), and an encoding laser part (7). The verification laser source (1) is fixedly installed at the cutting edge of the machine tool through the machine tool mating part (5). The encoding laser part (7) is provided on the side of the machine tool mating part (5) away from the machine tool. The circuit assembly part (6) that drives the encoding laser part (7) is provided between the machine tool mating part (5) and the encoding laser part (7).

3. The multi-axis linkage error correction device for CNC machine tools according to claim 2, characterized in that: The machine tool mating part (5) includes a lock head (8), a mating cone (9), a retaining ring (10), and a retaining groove (11). The mating cone (9) is a conical block structure corresponding to the machine tool. A lock head (8) is provided at the top of the mating cone (9). A retaining ring (10) is provided on the side of the mating cone (9) away from the lock head (8). A retaining groove (11) is provided on the side of the retaining ring (10) away from the mating cone (9). Two sets of opposing positioning notches (12) are provided on the retaining ring (10).

4. The multi-axis linkage error correction device for CNC machine tools according to claim 3, characterized in that: The circuit assembly section (6) includes a cylindrical structure tube (13), a battery, and a circuit assembly. The cylindrical structure tube (13) is provided on the side of the retaining ring (10) away from the mating cone (9). The battery and the circuit assembly are fixedly installed inside the cylindrical structure tube (13).

5. The multi-axis linkage error correction device for CNC machine tools according to claim 4, characterized in that: The coded laser unit (7) includes a structural block (14) and multiple sets of coded laser light sources (18). The cylindrical structural tube (13) is provided with a structural block (14) on the side away from the retaining ring (10). The structural block (14) is a square block structure. The side of the structural block (14) away from the cylindrical structural tube (13) is set as surface C (17). The two adjacent sides of surface C (17) are set as surface A (15) and surface B (16), respectively. Surface A (15), surface B (16) and surface C (17) are all perpendicular to each other. coded laser light sources (18) are provided on surface A (15), surface B (16) and surface C (17).

6. The multi-axis linkage error correction device for CNC machine tools according to claim 5, characterized in that: The coded laser light source (18) includes multiple sets of laser generators (19), which are arranged in a 7×7 dot matrix pattern, forming a coded pattern.

7. The multi-axis linkage error correction device for CNC machine tools according to claim 1, characterized in that: The forward signal receiving board (2), the side signal receiving board (3), and the opposite signal receiving board (4) are each equipped with multiple sets of dot-matrix arranged photoelectric signal receivers.

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