Building block type plate arrangement and coordinate correction method for laser double-sided cutting of fabric

Abstract

The present invention provides a building block type plate device and coordinate correction method for laser double-sided cutting of fabrics. The plate width adjustment device includes a rotating shaft and negative pressure pipe, a negative pressure box, a main plate, a plate module, a fine-tuning mechanism, a camera, and a flip positioning system. The plate width can be adjusted steplessly within the applicable range by quickly disassembling and assembling the building block type plate module; the negative pressure box has an independent cavity and a steel ball and spring structure built in, which enables each negative pressure cavity to be opened and closed independently, which is beneficial to the adsorption of fabrics and the simultaneous removal of laser cutting smoke. In the process of automatic recognition of cutting lines by machine vision, single-sided image distortion is corrected by Zhang's calibration method, and the double-sided coordinate correction method uses an image recognition straight line extraction algorithm to extract the reference lines on both the front and back sides, calculates the rotation axis equation through axial symmetric mapping, corrects the image coordinates, eliminates assembly errors, and generates an accurate laser cutting path. The present invention solves the error problem of double-sided cutting, eliminates the need for manual re-cutting, and improves work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of laser double-sided cutting of textiles, and in particular to a building block type plate arrangement device and a coordinate correction method for laser double-sided cutting of cloth. Background Art

[0002] Laser cutting equipment based on machine vision has begun to be used in the textile industry. Currently, most of them can only cut single-sided. Especially for large-scale textiles produced by circular knitting machines, only a few laser cutting equipment can cut double-sided, such as the utility model patent "A fabric laser cutting device" (patent number: ZL 202021744647.2). However, there are the following problems: First, the width of the fabric plate is not convenient to adjust, and it is difficult to adapt to the range of textiles being laser-cut from the narrowest to the widest; second, there is no negative pressure adsorption or other settings on the laser cutting surface, resulting in uneven fabric, and the smoke generated by laser cutting of fabric cannot be removed in time; third, the cutting line coordinates of the fabric on both sides of the plate cannot be accurately cut and connected after turning over due to factors such as rotary axis assembly errors and image distortion. The industry has difficulties and pain points such as manual cutting at the edge of the plate with scissors. Summary of the Invention

[0003] The present invention proposes a building block-type plate device and coordinate correction method for laser double-sided cutting of cloth. To address the above-mentioned difficulties in the laser double-sided cloth cutting industry, the present invention implements a building block-type plate design with an independent negative pressure chamber, which solves the problems of convenient and adjustable width of the cloth plate, flattening the cloth by adsorption, and simultaneous extraction of smoke. The innovative and unique double-sided coordinate correction method of the plate ensures that laser cutting based on machine vision is accurate and efficient, and can complete the cutting work in one go without the need for manual re-cutting.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A modular plate-laying device for laser double-sided cutting of fabrics, comprising a main plate-laying device, a plate-laying module, a negative pressure box, a rotating shaft serving as a negative pressure pipe, a negative pressure connection and disconnection mechanism, and a flip positioning system;

[0006] The rear end of the negative pressure box is connected to a rotating shaft and a negative pressure pipe to provide negative pressure and turning power for the negative pressure box;

[0007] The front end of the negative pressure box is equipped with an interface for connecting the main plate and the plate module;

[0008] The front end of the main sleeve and the sleeve module after being spliced in a building block manner is provided with a wedging mechanism;

[0009] The main sleeve, sleeve module and wedging mechanism can be assembled into a complete sleeve in a modular manner;

[0010] After splicing, the outermost panel module is connected to the fine-tuning mechanism;

[0011] The rear ends of the main sleeve plate and the sleeve plate module are respectively connected to the front side of the negative pressure box;

[0012] A negative pressure connection and cut-off mechanism is provided in the negative pressure box. The negative pressure connection and cut-off mechanism has a separate cavity for connecting or cutting off the negative pressure of the sleeve module;

[0013] The flip positioning system includes a motor-driven flip mechanism, an encoder coaxial with the motor, and a sensor for detecting the horizontal position of the sleeve;

[0014] The horizontal position detection sensors of the sleeve are arranged on both sides of the rear end of the negative pressure box;

[0015] When the sleeve plate horizontal position detection sensor does not obtain signals at the same time, the control system sends a rotation signal to the shaft motor, and coarsely adjusts until signals appear at both ends simultaneously, and then adjusts the sleeve plate to a precise horizontal position through an encoder coaxial with the motor.

[0016] Furthermore, a main interface and N secondary interfaces are provided at the front end of the negative pressure box. The main interface is connected to a fixed main sleeve, and the secondary interface is connected to N sleeve modules, where N is a natural number greater than or equal to 0. When N is 0, that is, the width of the main sleeve meets the fabric requirements, there is no need to set up the sleeve module.

[0017] Furthermore, the negative pressure connection and disconnection mechanism is provided with N separate cavities, each cavity corresponding to a sleeve module. That is, the main sleeve and the negative pressure box are always connected, and the additional sleeve modules are opened and closed as needed through the negative pressure connection and disconnection mechanism.

[0018] Furthermore, the fine-tuning mechanism is sleeved on the main sleeve plate or the outermost sleeve plate module, includes an edge fine-tuning module and is provided with fixing bolts.

[0019] Furthermore, the separate cavity of the negative pressure connection and disconnection mechanism is equipped with a steel ball and a spring. One end of the spring is fixed in the cavity, and the other end of the spring is connected to the steel ball. In the normal state, the spring pushes up the steel ball, blocks the negative pressure port, and the negative pressure is disconnected.

[0020] The sleeve module connector is inserted into the cavity through the interface, the connector bevel squeezes the steel ball to compress the spring, the negative pressure port opens, and is connected to the sleeve module.

[0021] Furthermore, the left and right edges of the main sleeve and the sleeve module are respectively provided with concave and convex structures for clamping, and the upper and lower surfaces are stainless steel plates fixed on the frame. Negative pressure absorbs the textiles through the openings on the plates, and the suction holes arranged on the upper and lower surfaces are staggered, leaving no vertical gaps on the upper and lower sides of the sleeve.

[0022] On the other hand, the present invention also discloses a method for calibrating double-sided coordinates of a plate for laser double-sided cutting of fabric, based on the above-mentioned building block plate device for laser double-sided cutting of fabric, comprising the following steps:

[0023] S1: The camera collects images of the front and back sides of the fabric before and after the template is flipped, and the Zhang calibration method is used to determine the image distortion correction parameters. Single-side image preprocessing and cutting line image recognition are performed separately;

[0024] S2: Based on the front and back images of the plate taken by S1, the contact lines between the front and back negative pressure boxes and the main plate connectors are automatically identified as reference lines. The two reference lines are found using the line extraction method of image processing. These two lines are projected onto a plane. The slope of the plate rotation axis is calculated using the angle formula. The linear equation of the plate rotation axis is generated by combining the coordinates of the intersection point. If the two lines do not intersect and are not parallel to the image X-axis (if they are parallel, no correction is required), the linear equation of the rotation axis is generated using the orthogonal slope of the two lines and the midpoint of the baseline.

[0025] S3: The edge points at both ends of the front cutting line are symmetrically mapped using the linear equation of the rotation axis obtained in S2 to generate the actual coordinates of the back of the template. The actual edge points of the back of the template obtained by image recognition are combined to generate an accurate laser cutting path.

[0026] Furthermore, the method of calculating the slope of the rotation axis using the angle formula and generating the straight line equation of the rotation axis of the plate in combination with the intersection coordinates includes the following steps:

[0027] First, let the straight lines where the two datum reference lines are located be 、 , the slope k1 is not equal to k2, and the straight line where the sleeve rotation axis is located is ;

[0028] Simultaneous Linear and Equation , find the intersection coordinates ;

[0029] Then, according to the relationship between the angle between the two straight lines and the axis of symmetry, the rotation axis is set The slope of ,but From to angle formula Calculated;

[0030] Finally, write the inclined straight line of the plate rotation axis point Point-slope form of the equation ;

[0031] If k1=k2≠0, and the midpoint of the baseline Draw the linear equation of the plate rotation axis If k1=k2=0, the coordinates of the positive and negative surfaces do not need to be corrected.

[0032] On the other hand, the present invention further discloses a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

[0033] As can be seen from the above technical solution, the modular plate device and coordinate correction method for laser double-sided cutting of fabrics of the present invention address the problems of existing equipment such as the difficulty in adjusting the plate width, the difficulty in forming a negative pressure cavity on the plate and the lack of adsorption force on the fabric, and the misalignment of the cutting lines connected on both sides due to the double-sided coordinate error of the plate. The plate width adjustment device of the present invention includes a rotating shaft that also serves as a negative pressure pipe, a negative pressure box, a main plate, a plate module, a fine-tuning mechanism, and a flip positioning system. The plate width can be adjusted steplessly within the applicable range through the rapid assembly and disassembly of the modular plate module; the negative pressure box has an independent cavity and a steel ball and spring structure built in, which realizes the independence of the negative pressure cavity of the main plate and each plate module, which is beneficial to the simultaneous removal of fabric adsorption and laser cutting smoke. In the process of automatic recognition of cutting lines by machine vision, single-sided image distortion is corrected by Zhang's calibration method, and the double-sided coordinate correction method uses the straight line extraction method of image processing to find the two reference lines, and project these two straight lines onto a plane. The system assembly error makes these two straight lines intersect, and the slope of the plate rotation axis is calculated using the angle formula, and the straight line equation of the plate rotation axis is generated in combination with the intersection coordinates. The slope of the plate rotation axis is calculated using the angle formula, and the rotation axis equation is calculated by axisymmetric mapping to correct the image coordinates, generate an accurate laser cutting path, and avoid system assembly errors. The present invention is novel in design and unique in its double-sided coordinate correction method, which solves the error problem of double-sided cutting based on machine vision laser, eliminates the need for manual re-cutting, and improves work efficiency.

[0034] Specifically, compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. Based on improved machine vision algorithms and the calculation technology of the linear equation of the rotation axis of the template, the coordinates of the cutting lines on both sides are automatically corrected, minimizing the alignment error of double-sided cutting. By matching the axisymmetric mapping with the edge point coordinates, the problem of disconnected cutting lines caused by rotation axis errors or image distortion is solved, eliminating manual re-cutting and significantly improving the automation level and production efficiency of double-sided cutting.

[0036] 2. Through the building block combination design of the main plate, plate module and fine-tuning mechanism, the plate width can be adjusted steplessly from the minimum to the maximum range to meet the cutting needs of textiles of different widths. It effectively solves the problem of limited application range caused by fixed plate size of traditional equipment, and significantly improves the versatility and flexibility of the equipment.

[0037] 3. The linkage design of the rotating shaft, negative pressure pipe and negative pressure box, combined with the independent cavity control of the negative pressure connection and disconnection mechanism, can automatically activate the negative pressure adsorption function when the sleeve module is connected, ensuring that the fabric is flat and fixed. At the same time, it can also simultaneously absorb the smoke and debris generated by laser cutting, which not only ensures the safety of the processing environment, but also improves cutting accuracy and efficiency.

[0038] 4. The plate modules utilize a wedge-locking mechanism and independent chamber design, enabling quick assembly and disassembly, significantly reducing equipment maintenance complexity. The sub-chamber control technology of the negative pressure system allows each module to independently open and close the negative pressure according to actual needs, reducing ineffective energy consumption, extending equipment life, and effectively lowering overall maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the plate width adjustment device for laser cutting cloth according to the present invention;

[0040] Figure 2 This is a schematic diagram of the three-dimensional structure of the negative pressure box of the plate width adjustment device for laser cutting cloth of the present invention;

[0041] Figure 3 This is a schematic cross-sectional perspective structural diagram of the negative pressure connection and cutting mechanism of the plate width adjustment device for laser cutting cloth according to the present invention;

[0042] Figure 4 This is a schematic diagram of the cross-sectional three-dimensional structure of the wedging mechanism of the plate width adjustment device for laser cutting cloth of the present invention;

[0043] Figure 5 This is a schematic diagram of the three-dimensional structure of the fine-adjustment mechanism of the plate width adjustment device for laser cutting cloth of the present invention;

[0044] Figure 6 Schematic diagram of the edge intersection of the laser cutting cloth plate width adjustment device and the double-sided coordinate correction method of the present invention;

[0045] The numbers in the figure are:

[0046] 1. Rotating shaft and negative pressure pipe; 2. Negative pressure box; 201. Negative pressure connection and disconnection mechanism; 2011. Steel ball; 2012. Spring; 202. Main interface; 203. Secondary interface; 204. Front side of negative pressure box; 3. Main sleeve; 301. Main sleeve connector; 4. Sleeve module; 5. Fine-tuning mechanism; 501. Fine-tuning mechanism; 502. Tightening bolt; 6. Wedging mechanism; 601. Concave groove; 602. Convex groove; 7. Flip positioning system; 701. Horizontal flip mechanism; 702. Horizontal flip degree detection sensor; 8. Encoder; 9. Camera; 10. Bracket; 11. Fabric; 12. Cutting line; 13. Edge point; 14. Datum reference line. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0048] like Figures 1-6 As shown, an embodiment of the present invention provides a modular plate-type device for laser double-sided cutting of fabrics, comprising: a main plate 3, a plate-type plate module 4, a negative pressure box 2, a rotating shaft and negative pressure pipe 1, a negative pressure connection and disconnection mechanism 201, and a flip positioning system 7;

[0049] The rear end of the negative pressure box 2 is connected to the rotating shaft and negative pressure pipe 1, which provides negative pressure and turning power for the negative pressure box 2;

[0050] The front end of the negative pressure box 2 is provided with an interface for connecting the main sleeve 3 and the sleeve module 4;

[0051] The front end of the main cover plate 3 and the cover plate module 4 after being spliced in a building block manner is provided with a wedging mechanism;

[0052] The main sleeve plate 3, sleeve plate module 4, and wedging mechanism 6 can be assembled into a complete sleeve plate in a modular manner;

[0053] After splicing, the outermost panel module 4 is connected to the fine-tuning mechanism 501;

[0054] The rear ends of the main plate 3 and the plate module 4 are respectively connected to the front side of the negative pressure box 2;

[0055] A negative pressure connection and cut-off mechanism 201 is provided in the negative pressure box 2. The negative pressure connection and cut-off mechanism 201 has a separate cavity for connecting or cutting off the negative pressure of the plate module.

[0056] The flip positioning system 7 includes a motor-driven flip mechanism, an encoder coaxial with the motor, and a sensor for detecting the horizontal position of the sleeve;

[0057] The horizontal position detection sensors of the sleeve are arranged on both sides of the rear end of the negative pressure box;

[0058] When the sleeve plate horizontal position detection sensor does not obtain signals at the same time, the control system sends a rotation signal to the shaft motor, and coarsely adjusts until signals appear at both ends simultaneously, and then adjusts the sleeve plate to a precise horizontal position through an encoder coaxial with the motor.

[0059] The following are specific instructions:

[0060] The rotating shaft and negative pressure pipe 1 is used to provide negative pressure adsorption force and drive the sleeve to flip; the negative pressure box 2, the rear end of which is connected to the rotating shaft and negative pressure pipe 1, and the front side 204 is provided with a main interface 202 and multiple auxiliary interfaces 203, and the interior contains multiple independent cavities; the main sleeve 3 is inserted into the main interface 202 and fixed by a wedging mechanism 6; multiple sleeve modules 4 are inserted into the auxiliary interface 203 and locked with adjacent modules by a wedging mechanism 6 to form a continuous sleeve structure; the fine-tuning mechanism 5 is sleeved on the outermost sleeve module On block 4, the width of the sleeve is adjusted steplessly by manual adjustment; the negative pressure connection and cut-off mechanism 201 is arranged in an independent cavity of the negative pressure box 2, and comprises a steel ball 2011 and a spring 2012, which are used to control the negative pressure opening and closing of the sleeve module 4; the flip positioning system 7 includes a horizontal flip mechanism 701 and a horizontal flip degree detection sensor 702, which are used to realize the horizontal flipping and precise positioning of the sleeve; a camera 11 is arranged directly above the sleeve for taking images, and the camera 11 is installed on a fixed bracket 12.

[0061] Specifically, a concave groove 601 and a convex groove 602 are respectively provided on both sides of the main sleeve plate 3 and the sleeve plate module 4, and the quick connection and fixation between the modules are achieved through the engagement of the wedging mechanism 6.

[0062] The fine-tuning mechanism 5 includes an edge fine-tuning module 501 and a fixing bolt 502 , which can achieve stepless adjustment.

[0063] In the negative pressure connection and disconnection mechanism 201, when the sleeve module 4 is inserted into the auxiliary interface 203, the inclined surface of the joint squeezes the steel ball 2011 and compresses the spring 2012, and the negative pressure channel is opened; when the module is removed, the spring resets and the steel ball closes the negative pressure port.

[0064] The suction holes arranged on the upper and lower surfaces of the main cover plate 3 and the cover plate module 4 are staggered, and the edges adopt a concave-convex structure. There is no vertical gap between the upper and lower covers to prevent the laser from penetrating to the lower layer and damaging the other side of the textile fabric.

[0065] The working process of the flip positioning system 7 is as follows: the horizontal flip degree detection sensor 702 monitors the tilt angle of the sleeve, drives the shaft motor to adjust to the synchronization of the signals on both sides, and then adjusts the sleeve to a precise horizontal position through the encoder coaxial with the motor.

[0066] Accordingly, the steps of the double-sided coordinate correction method corresponding to the building block type plate-laying device for laser double-sided cutting of cloth in the embodiment of the present invention are as follows:

[0067] S1: The camera collects images of the front and back sides of the fabric before and after the template is flipped, and the Zhang calibration method is used to determine the image distortion correction parameters. Single-side image preprocessing and cutting line image recognition are performed separately;

[0068] S2: Based on the front and back images of the plate taken by S1, the contact lines between the front and back negative pressure boxes and the main plate connectors are automatically identified as baseline reference lines. The two baseline reference lines are found using the line extraction method of image processing. These two lines are projected onto a plane, and the slope of the plate rotation axis is calculated using the angle formula. The linear equation of the plate rotation axis is generated based on the intersection coordinates. If the two lines do not intersect and are not parallel to the image X-axis (if parallel, no correction is required), then the linear equation of the rotation axis does not need to be generated using the orthogonal slopes of these lines and the midpoint of the baseline.

[0069] S3: The edge points at both ends of the front cutting line are symmetrically mapped using the linear equation of the rotation axis obtained in S2 to generate the actual coordinates of the back of the template. The actual edge points of the back of the template obtained by image recognition are combined to generate an accurate laser cutting path.

[0070] Specifically, the linear equations of the straight lines where the two reference lines of the plate are located are obtained according to image recognition, and the linear equations of the plate rotation axis are calculated by the angle formula. First, the straight lines where the two reference lines are located are 、 , the slope k1 is not equal to k2, and the straight line where the sleeve rotation axis is located is ; Then, the simultaneous straight lines and Equation , find the intersection coordinates ; Then, according to the relationship between the angle between the two straight lines and the symmetry axis, the rotation axis is set The slope of ,but The angle formula can be used Calculate and finally, the point-slope form of the straight line equation of the sleeve rotation axis can be written If k1=k2≠0, and the midpoint of the baseline Draw the linear equation of the plate rotation axis ; If k1=k2=0, the coordinates of the front and back sides do not need to be corrected.

[0071] Furthermore, when the edge points on both sides of the fabric to be cut need to be connected in pairs, the specific steps are as follows:

[0072] First, let the front cutting line to be cut be a curve , the reverse cutting line is , then the front The left and right edge points are respectively , ;

[0073] Then, with the rotation axis of the plate as the axis of symmetry, the front cutting line of the fabric after the plate is turned over can be obtained after the coordinate correction of the present invention. The coordinates of the edge points , ;

[0074] Similarly, the reverse cutting line is identified by image recognition Get the left and right edge points 、 Finally, and 、 and The left and right edge lines on both sides are connected in pairs.

[0075] The following examples illustrate:

[0076] Taking a polyester blended fabric with a width of 445 mm and a length of 475 mm as an example, the specific implementation process is as follows, combining the plate width adjustment device and the double-sided coordinate correction method of the embodiment of the present invention:

[0077] In this embodiment, the base width of the main plate 3 is 100 mm, each plate module 4 is 50 mm wide, and each fine-tuning module 501 is also 50 mm wide. Based on the fabric width of 445 mm, five plate modules are arranged outside the main plate, resulting in a total width of 5 × 50 mm = 250 mm. After stacking, the total width is 100 mm + 250 mm = 350 mm. The remaining 95 mm is compensated by expanding the fine-tuning modules 501 on both sides outward through the fixing bolts 502 of the fine-tuning mechanism 5 (see Figure 5 ).

[0078] The main plate is inserted into the main interface 202 of the negative pressure box 2, and the plate modules are sequentially inserted into the secondary interface 203, and the concave groove 601 is engaged with the convex groove 602 to lock (as shown in FIG. Figure 4 The fine-tuning mechanism is installed on the outermost module, and the rotating bolt pushes the sleeve to expand to 445mm. When the sleeve module is inserted, the negative pressure connection and disconnection mechanism 201 is triggered, and the spring 2012 contracts after the steel ball 2011 is compressed, and the negative pressure channel is opened (such as Figure 3 ), the independent cavities of each module are connected to ensure that the fabric 11 is adsorbed and flat.

[0079] In this embodiment, after the fabric is placed on the cover plate and leveled, the rotating shaft and negative pressure duct 1 provides a negative pressure of -80 kPa, sucking the fabric through the offset suction holes and removing the laser smoke. The flip positioning system 7 is activated, and the horizontal flip angle detection sensor 702 monitors the cover plate's tilt angle in real time. Combined with the feedback from encoder 8, it drives the rotating shaft motor using low-frequency PWM to adjust the cover plate to a horizontal position (error ≤ ±0.5°). The camera 9 collects 3648*5472 resolution images of the front and back sides of the fabric through the fixed bracket 10, and performs distortion correction based on the Zhang calibration method (radial distortion coefficient t1=-0.556063498818687, t2=-26.5648786716042, k3=685.016952803096; tangential distortion coefficient p1=-0.0638132640265174, p2=0.0204418646973043) to eliminate barrel distortion and pincushion distortion of the image.

[0080] In this embodiment, the front and back reference lines are extracted by a multi-scale Elder-Zack edge detector or other methods. The front reference line equation is:

[0081] ;

[0082] The reverse side is:

[0083] After solving the simultaneous equations, we can obtain the coordinates of the intersection point P(3427.6161077169395,1781.3087919766467).

[0084] The slope of the rotation axis is calculated using the angle formula as k=0.003203684165547, generating the rotation axis equation .

[0085] In this example, post-cutting measurements showed that the cutting lines on both sides were completely connected, with a total width error of ±0.15 mm and a length error of ±0.12 mm. This example demonstrates the flexibility of the 100 mm main plate and 50 mm module combination, as well as the high precision of the double-sided correction algorithm, significantly improving the efficiency and quality of automated cutting.

[0086] On the other hand, the present invention further discloses a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

[0087] The present application also provides a computer program product containing instructions, which, when run on a computer, enables the computer to execute any coordinate correction method of a building block-type plate-laying device for laser double-sided cutting of fabrics in the above-mentioned embodiments.

[0088] It is understandable that the system, device and storage medium provided in the embodiments of the present invention correspond to the method provided in the embodiments of the present invention, and the explanation, examples and beneficial effects of the relevant contents can refer to the corresponding parts of the above methods.

[0089] In the above embodiments, all or part of the embodiments can be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, hard disk, tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0090] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0091] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A modular plate-laying device for laser double-sided cutting of fabrics, comprising a main plate-laying device, characterized in that: It also includes a sleeve module, a negative pressure box, a rotating shaft and negative pressure pipeline, a negative pressure connection and disconnection mechanism, and a flip positioning system; The rear end of the negative pressure box is connected to a rotating shaft and a negative pressure pipe to provide negative pressure and turning power for the negative pressure box; The front end of the negative pressure box is equipped with an interface for connecting the main plate and the plate module; The front end of the main sleeve and the sleeve module after being spliced in a building block manner is provided with a wedging mechanism; The main sleeve, sleeve module and wedging mechanism can be assembled into a complete sleeve in a modular manner; After splicing, the outermost panel module is connected to the fine-tuning mechanism; The rear ends of the main sleeve plate and the sleeve plate module are respectively connected to the front side of the negative pressure box; A negative pressure connection and cut-off mechanism is provided in the negative pressure box. The negative pressure connection and cut-off mechanism has a separate cavity for connecting or cutting off the negative pressure of the sleeve module; The flip positioning system includes a motor-driven flip mechanism, an encoder coaxial with the motor, and a sensor for detecting the horizontal position of the sleeve; The horizontal position detection sensors of the sleeve are arranged on both sides of the rear end of the negative pressure box; When the horizontal position detection sensor of the sleeve plate does not obtain a signal at the same time, the control system sends a rotation signal to the shaft motor, and makes a coarse adjustment until the signals appear at both ends, and then adjusts the sleeve plate to a precise horizontal position through the encoder coaxial with the motor; The left and right edges of the main sleeve and the sleeve module are respectively provided with concave and convex structures for clamping. The upper and lower surfaces are stainless steel plates fixed on the frame. Negative pressure absorbs textiles through the openings on the plates. The suction holes arranged on the upper and lower surfaces are staggered, and no vertical gaps are left on the upper and lower surfaces of the sleeve.

2. The modular plate-laying device for laser double-sided cutting of cloth according to claim 1, characterized in that: The front end of the negative pressure box is provided with a main interface and N sub-interfaces. The main interface is connected to a fixed main plate, and the sub-interfaces are connected to N plate modules, where N is a natural number greater than or equal to 0.

3. The modular plate-laying device for laser double-sided cutting of cloth according to claim 2, characterized in that: The negative pressure connection and disconnection mechanism is provided with N separate cavities, and each cavity corresponds to a sleeve plate module.

4. The modular plate-laying device for laser double-sided cutting of cloth according to claim 1, characterized in that: The fine-tuning mechanism is sleeved on the main sleeve plate or the outermost sleeve plate module, and includes an edge fine-tuning module and is provided with fixing bolts.

5. The modular plate-laying device for laser double-sided cutting of cloth according to claim 1, characterized in that: The negative pressure connection and disconnection mechanism has a separate cavity with a steel ball and a spring inside. One end of the spring is fixed in the cavity, and the other end of the spring is connected to the steel ball. In normal state, the spring pushes up the steel ball to block the negative pressure port, and the negative pressure is disconnected. The sleeve module connector is inserted into the cavity through the interface, the connector bevel squeezes the steel ball to compress the spring, the negative pressure port opens, and is connected to the sleeve module.

6. A method for calibrating double-sided coordinates of a plate for laser double-sided cutting of fabric, based on the modular plate device for laser double-sided cutting of fabric according to any one of claims 1 to 5, characterized in that: The following steps are included: S1: The camera collects images of the front and back sides of the fabric before and after the template is flipped, and the Zhang calibration method is used to determine the image distortion correction parameters. Single-side image preprocessing and cutting line image recognition are performed separately; S2: Based on the front and back images of the plate taken by S1, the contact lines between the front and back negative pressure boxes and the main plate connectors are automatically identified as reference lines. The two reference lines are found using the line extraction method of image processing. These two lines are projected onto a plane. The slope of the plate rotation axis is calculated using the angle formula. The linear equation of the plate rotation axis is generated by combining the coordinates of the intersection point. If the two lines do not intersect and are not parallel to the image X-axis, the linear equation of the rotation axis is generated using the orthogonal slope of the two lines and the midpoint of the baseline. If they are parallel, no correction is required. S3: The edge points at both ends of the front cutting line are symmetrically mapped using the linear equation of the rotation axis obtained in S2 to generate the actual coordinates of the back of the template. The actual edge points of the back of the template obtained by image recognition are combined to generate an accurate laser cutting path.

7. The method for calibrating double-sided coordinates of a plate for double-sided laser cutting of fabric according to claim 6, characterized in that: The slope of the plate rotation axis is calculated by using the angle formula, and the straight line equation of the plate rotation axis is generated by combining the intersection coordinates. The following steps are included: First, let the straight lines where the two datum reference lines are located be 、 , the slope k1 is not equal to k2, and the straight line where the sleeve rotation axis is located is ; Simultaneous Linear and Equation , find the intersection coordinates ; Then, according to the relationship between the angle between the two straight lines and the axis of symmetry, the rotation axis is set The slope of ,but From to angle formula Calculated; Finally, write the inclined straight line of the plate rotation axis point equation ; If k1=k2≠0, and the midpoint of the baseline Draw the equation of the straight line of the plate rotation axis: ; If k1=k2=0, the coordinates of the front and back sides do not need to be corrected.

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