Multi-layer corrugated cardboard production equipment

Abstract

The present invention relates to the technical field of online detection of corrugated cardboard, and specifically provides a multi-layer corrugated cardboard production device, the production device comprising: a laser generating unit, configured to generate at least one set of cross-distributed linear lasers, the linear lasers irradiating the corrugated cardboard and generating linear light spots on the corrugated cardboard; a visual acquisition unit, configured to acquire an image of the corrugated cardboard containing the linear light spots; and a calculation unit, electrically connected to the visual acquisition unit, configured to determine the flatness of the corrugated cardboard based on the straightness of the linear light spots in the image. The multi-layer corrugated cardboard production device disclosed in the present invention will not miss any detection when detecting the flatness of the corrugated cardboard.

Description

Technical Field

[0001] The present invention relates to the technical field of on-line detection of corrugated cardboard, in particular to a multi-layer corrugated cardboard production device. Background Art

[0002] During the production of corrugated cardboard, if the temperature and humidity of the raw paper are not well controlled, it is easy to cause the flatness of the corrugated cardboard to be unqualified, such as warping. Therefore, during the production of corrugated cardboard, it is necessary to monitor the flatness of the corrugated cardboard in real time so that the temperature and humidity can be adjusted in real time to improve the quality of the corrugated cardboard.

[0003] Currently, corrugated cardboard inspection methods use multiple distance meters to measure the distance between the cardboard and the distance meter. If the cardboard is flat, the change in the distance meter's detection value meets the set requirements. If there is warping, the change in the distance meter's detection value does not meet the set requirements. However, this method can only detect multiple points. If uneven locations (such as bumps and bends) avoid the detection points, the problem of missed detection may occur. To prevent missed detections with this method, additional detection points are required, thereby increasing inspection costs. Therefore, this application proposes a multi-layer corrugated cardboard production device. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-layer corrugated cardboard production device to solve the problem that the current flatness online detection device is prone to missed detection.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A multi-layer corrugated cardboard production equipment, the production equipment comprising:

[0007] A laser generating unit, configured to generate at least one set of cross-distributed linear lasers, wherein the linear lasers are irradiated onto the corrugated cardboard and generate linear light spots on the corrugated cardboard;

[0008] A visual acquisition unit, used for acquiring an image of a corrugated cardboard containing a linear light spot;

[0009] A calculation unit is electrically connected to the visual acquisition unit, and the calculation unit determines the flatness of the corrugated cardboard based on the straightness of the linear light spot of the image.

[0010] Furthermore, a midline of a diagonal angle of the linear light spot along the moving direction of the corrugated paperboard coincides with the moving direction of the corrugated paperboard.

[0011] Furthermore, the calculation unit calculates the straightness of the linear laser by the following steps:

[0012] Step S1, average extraction includes extracting the coordinates of multiple points on the linear laser in the image;

[0013] Step S2, fitting a curve function formed by multiple points;

[0014] Step S3: judging the flatness of the corrugated cardboard based on the fitting curve. When the fitting curve is a straight line, the flatness of the corrugated cardboard is judged to be qualified. When the fitting curve is not a straight line, the flatness of the corrugated cardboard is judged to be unqualified.

[0015] Furthermore, when the fitting curve is not a straight line, the curvature of the fitting curve is determined. When the curvature is lower than a preset value, the flatness of the corrugated cardboard is determined to be qualified. When the curvature is greater than the preset value, the flatness of the corrugated cardboard is determined to be unqualified.

[0016] Furthermore, the laser generating unit includes a plurality of laser emitting units, each of which can generate a cross-shaped linear laser, and the visual acquisition unit is provided in plurality, each of which corresponds to a laser emitting unit.

[0017] Furthermore, the intersection of the linear light spots is located on the center line of the corrugated cardboard.

[0018] Furthermore, the production equipment also includes:

[0019] The position adjustment unit is used to adjust the distance between each laser generating unit and the visual acquisition unit so that the linear laser generated by each laser generating unit can be irradiated onto a piece of divided corrugated cardboard.

[0020] Furthermore, the position adjustment unit includes:

[0021] A linear displacement assembly, comprising a guide rail and two synchronous belt assemblies with opposite transmission directions;

[0022] A sliding component is slidably connected to the guide rail, and a clamping mechanism and a switching component are provided in the sliding component. The switching component controls the clamping mechanism to clamp or release the linear displacement component, so that the sliding component is driven by the clamped synchronous belt component to slide on the guide rail.

[0023] Furthermore, the clamping mechanism includes:

[0024] A sliding plate, the sliding plate being slidably connected to the guide rail, and having through-hole structures at both ends of the sliding plate;

[0025] A clamping block, the clamping block having an L-shaped structure, the clamping block being slidably connected to the through-hole structure, the portion of the clamping block parallel to the sliding plate and the sliding plate being respectively located on both sides of the synchronous belt on the synchronous belt assembly, and a clamping hole being provided at one end of the clamping block connected to the sliding plate;

[0026] A switching block is slidably connected to the sliding plate, and inclined blocks are provided at both ends of the switching block. The inclined blocks are located inside the clamping hole. When the switching block slides toward the clamping block, the inclined blocks lift the clamping block so that the clamping block moves toward the sliding plate, thereby clamping the synchronous belt.

[0027] Furthermore, the sliding plate is dampedly connected to the guide rail.

[0028] In summary, the present invention has the following beneficial effects compared with the prior art:

[0029] The multi-layer corrugated cardboard production equipment disclosed in an embodiment of the present invention uses two cross-distributed linear laser beams to irradiate the corrugated cardboard when detecting the flatness of the corrugated cardboard, and obtains an image of the corrugated cardboard through the visual acquisition unit. When an uneven position occurs, the linear light spot of the linear laser on the corrugated cardboard will bend, and the cross-distributed linear laser can fully cover the corrugated cardboard and the uneven position and direction, so that the problem of missed detection will not occur during detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a multi-layer corrugated cardboard production device disclosed in an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of a process for determining the flatness of corrugated paper by a calculation unit in a multi-layer corrugated paperboard production device disclosed in an embodiment of the present invention.

[0032] Figure 3 This is a linear spot pattern on a corrugated cardboard with high flatness.

[0033] Figure 4 This is the linear spot pattern on the warped corrugated cardboard.

[0034] Figure 5 The linear spot pattern on the corrugated cardboard with pits.

[0035] Figure 6 This is a schematic structural diagram of a position adjustment unit in a multi-layer corrugated cardboard production device disclosed in an embodiment of the present invention.

[0036] Figure 7 for Figure 6 A front view of the adjustment portion disclosed in .

[0037] Figure 8 for Figure 7 Cross-sectional view of AA in the figure.

[0038] Figure 9 for Figure 6 Schematic diagram of the structure inside the sliding component in the adjustment part disclosed in .

[0039] Figure 10 for Figure 9 Schematic diagram of the connection between the sliding plate, guide rail and clamping block in the disclosed sliding assembly.

[0040] Figure 11 for Figure 6 Schematic diagram of the structure of the switching block in the adjustment unit disclosed in .

[0041] Figure 12 for Figure 6 Schematic diagram of the structure of the clamping block in the adjustment part disclosed in.

[0042] Reference numerals:

[0043] 100. Frame; 200. Laser generating unit; 300. Vision acquisition unit; 400. Linear displacement assembly; 410. Synchronous belt assembly; 420. Guide rail; 500. Sliding assembly; 501. Connector; 502. Slider; 510. Sliding plate; 511. Limit block; 520. Clamping block; 521. Sliding section; 522. Clamping section; 523. Clamping hole; 530. Switching block; 531. Oblique block; 532. Limiting groove; 533. Clamping groove; 540. Switching assembly; 541. Drive plate; 542. Screw; 543. Drive motor; 550. Upper cover; 560. Fastening screw; 570. Damping block; 580. Elastic block; 600. Fixed plate. DETAILED DESCRIPTION

[0044] 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, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] like Figure 1 As shown, one embodiment of the present invention provides a multi-layer corrugated cardboard production device, the production device comprising:

[0046] The laser generating unit 200 is used to generate at least one set of cross-distributed linear lasers, which are irradiated onto the corrugated cardboard and generate linear light spots on the corrugated cardboard;

[0047] The visual acquisition unit 300 is used to acquire an image of the corrugated cardboard containing the linear light spot;

[0048] A calculation unit is electrically connected to the visual acquisition unit 300 , and the calculation unit determines the flatness of the corrugated cardboard based on the straightness of the linear light spot of the image.

[0049] Specifically, in this embodiment, the production equipment is installed on a cross-cutting machine for corrugated cardboard. The cross-cutting process is the last cutting process of the corrugated cardboard. If there are uneven positions, the places that can produce unevenness have already been produced after cross-cutting. In subsequent processes, no new unevenness will be produced. At the same time, when the corrugated cardboard is cross-cut, the corrugated cardboard will not be stacked. The folding process of the corrugated cardboard is after cross-cutting. Therefore, installing the production equipment disclosed in this application on the cross-cutting machine can fully detect the corrugated cardboard.

[0050] When testing the flatness of corrugated cardboard, Figures 3 to 5 As shown, the linear laser generated by the laser generating unit 200 generates a cross-shaped linear light spot on the corrugated cardboard. During the transmission of the corrugated cardboard, the linear laser scans the corrugated cardboard, and the visual acquisition unit 300 obtains the image of the corrugated cardboard and sends it to the calculation unit. The calculation unit detects the straightness of the linear light spot in real time based on the obtained image information, and judges the flatness of the corrugated cardboard based on the straightness of the linear light spot. When the corrugated cardboard has uneven areas, such as warping or bulges, the linear laser scans the uneven areas, and the linear light spot appears curved in the image, thereby detecting the uneven areas of the corrugated cardboard.

[0051] The multi-layer corrugated cardboard production equipment disclosed in an embodiment of the present invention detects the flatness of the corrugated cardboard by irradiating the corrugated cardboard with two cross-distributed linear laser beams, and acquiring an image of the corrugated cardboard through the visual acquisition unit 300. When an uneven position occurs, the linear spot of the linear laser on the corrugated cardboard will bend, and the cross-distributed linear laser can fully cover the corrugated cardboard and the uneven position and direction, so that the problem of missed detection will not occur during detection.

[0052] Specifically, in this embodiment, the laser generating unit 200 and the vision acquisition unit 300 are both fixedly mounted on the frame 100. The frame 100 is a flat plate structure. The frame 100 is fixedly connected to the cross-cutting machine by bolts. The laser generating unit 200 and the vision acquisition unit 300 are fixedly connected to the frame 100 by bolts.

[0053] As a preferred implementation in this embodiment, the midline of the diagonals of the linear light spot along the direction of movement of the corrugated cardboard coincides with the direction of movement of the corrugated cardboard. In this embodiment, the linear light spot is on the corrugated cardboard, and the corrugated cardboard is cross-shaped, with two sets of symmetrical angles, and the midlines of the two sets of symmetrical angles are perpendicular to each other. Then, the midline of one of the angles of a set of diagonals distributed along the direction of movement of the corrugated cardboard coincides with the direction of movement of the corrugated cardboard. This arrangement facilitates the calculation unit to process image information and perform subsequent calculations.

[0054] In this embodiment, if Figure 2 As shown, the calculation unit calculates the straightness of the linear laser including the following steps:

[0055] Step S1, average extraction includes extracting the coordinates of multiple points on the linear laser in the image;

[0056] Step S2, fitting a curve function formed by multiple points;

[0057] Step S3: judging the flatness of the corrugated cardboard based on the fitting curve. When the fitting curve is a straight line, the flatness of the corrugated cardboard is judged to be qualified. When the fitting curve is not a straight line, judging the curvature of the fitting curve. When the curvature is lower than a preset value, the flatness of the corrugated cardboard is judged to be qualified. When the curvature is greater than the preset value, the flatness of the corrugated cardboard is judged to be unqualified.

[0058] In this embodiment, converting the flatness of the corrugated cardboard into a numerical value can not only conveniently determine the degree of unevenness of the corrugated cardboard, but also provide an accurate basis for adjusting the parameters of the corrugated cardboard production line, making the production parameter adjustment of the corrugated cardboard more accurate. Example

[0059] As another embodiment of the present invention, this embodiment is different from embodiment 1 in that, Figure 6 and Figure 7 As shown, the laser generating unit 200 includes a plurality of laser emitting units, each of which can generate a cross-shaped linear laser. The visual acquisition unit 300 is provided with a plurality of units, each of which corresponds to a laser emitting unit. This arrangement enables each corrugated cardboard after segmentation to be detected by one visual acquisition unit 300 and one laser emitting unit. The production equipment further includes:

[0060] The position adjustment unit is used to adjust the distance between each laser generating unit 200 and the visual acquisition unit 300 so that the linear laser generated by each laser generating unit 200 can be irradiated onto a piece of cut corrugated cardboard.

[0061] Specifically, in this embodiment, during the production process of the corrugated cardboard, the corrugated cardboard will be cut horizontally and longitudinally according to customer needs. If there are defects in the cut corrugated cardboard, there will be a problem of warping. Therefore, in this embodiment, a plurality of laser generating units 200 and the visual acquisition units 300 are provided. The plurality of laser generating units 200 and the visual acquisition units 300 respectively detect a divided corrugated cardboard. When switching the dividing size of the corrugated cardboard, the position of the laser generating unit 200 and the visual acquisition unit 300 is adjusted by the position adjustment unit so that each of the laser generating units 200 is located directly above the center of the corrugated cardboard.

[0062] like Figures 6 to 10 As shown in FIG. 1 , as a preferred implementation in this embodiment, the position adjustment unit includes:

[0063] The position adjustment unit is used to adjust the distance between each laser generating unit 200 and the visual acquisition unit 300 so that the linear laser generated by each laser generating unit 200 can be irradiated onto a piece of cut corrugated cardboard.

[0064] Specifically, in this embodiment, during the production process of the corrugated cardboard, the corrugated cardboard will be cut horizontally and longitudinally according to customer needs. If there are defects in the cut corrugated cardboard, there will be a problem of warping. Therefore, in this embodiment, a plurality of laser generating units 200 and the visual acquisition units 300 are provided. The plurality of laser generating units 200 and the visual acquisition units 300 respectively detect a divided corrugated cardboard. When switching the dividing size of the corrugated cardboard, the position of the laser generating unit 200 and the visual acquisition unit 300 is adjusted by the position adjustment unit so that each of the laser generating units 200 is located directly above the center of the corrugated cardboard.

[0065] like Figures 6 to 10 As shown in FIG. 1 , as a preferred implementation in this embodiment, the position adjustment unit includes:

[0066] A linear displacement assembly 400, comprising a guide rail 420 and two synchronous belt assemblies 410 with opposite transmission directions;

[0067] A sliding assembly 500 slidably connected to the guide rail 420 , wherein a clamping mechanism and a switching assembly 540 are provided within the sliding assembly 500 . The switching assembly 540 controls the clamping mechanism to clamp or release the linear displacement assembly 400 , so that the sliding assembly 500 is driven by the clamped synchronous belt assembly 410 to slide on the guide rail 420 ;

[0068] Specifically, in this embodiment, the linear displacement component 400 is installed on the corrugated cardboard cutting equipment. When adjusting the position of the laser generating unit 200 (in this embodiment, the laser generating unit 200 and the visual acquisition unit 300 are installed on the same sliding component 500, and when adjusting the position of the laser generating unit 200 as described later, the visual acquisition unit 300 is adjusted synchronously), according to the current position change path of the laser generating unit 200, the switching component 540 is used to control the clamping mechanism to clamp the corresponding synchronous belt component 410. For example, if the laser generating unit 200 at the current position should move to the left, the clamping mechanism clamps the synchronous belt component 410 rotating to the left, and moves to the left under its drive. When the sliding component 500 moves to the preset position, the clamping mechanism releases the synchronous belt component 410, and the sliding component 500 stops.

[0069] In this embodiment, the synchronous belt assembly 410 is an existing technology, and the synchronous belt assembly 410 includes a synchronous motor, a synchronous wheel and a synchronous belt, etc. The synchronous motor drives the synchronous belt to rotate through the synchronous wheel, and the clamping mechanism clamps the synchronous belt. The guide rail 420 is an existing technology, such as the guide rail 420 is an I-shaped guide rail.

[0070] As a preferred implementation in this embodiment, the position adjustment unit further includes a fixing plate 600 , and the linear displacement assembly 400 is fixedly connected to the fixing plate 600 . The setting of the fixing plate 600 facilitates the installation of the linear displacement assembly 400 .

[0071] As a preferred implementation in this embodiment, Figures 8 to 12 As shown, the clamping mechanism includes:

[0072] A sliding plate 510 slidably connected to the guide rail 420 , with through-hole structures provided at both ends of the sliding plate 510 ;

[0073] A clamping block 520 having an L-shaped structure and slidably connected to the through-hole structure. The portion of the clamping block 520 parallel to the sliding plate 510 and the sliding plate 510 are respectively located on both sides of the synchronous belt on the synchronous belt assembly 410. A clamping hole 523 is provided at one end of the clamping block 520 connected to the sliding plate 510.

[0074] A switching block 530 is slidably connected to the sliding plate 510. Slanted blocks 531 are provided at both ends of the switching block 530. The slanted blocks 531 are located inside the clamping hole 523. When the switching block 530 slides toward the clamping block 520, the slanted blocks 531 lift the clamping block 520 to move toward the sliding plate 510, thereby clamping the synchronous belt.

[0075] Specifically, such as Figure 9 and Figure 10 As shown, the sliding plate 510 is a square plate, the sliding plate 510 is arranged parallel to the synchronous belt, the sliding plate 510 is provided with a square protrusion near the synchronous belt, the sliding plate 510 is fixedly connected to the slider 502, the clamping block 520 is fixedly connected to the sliding plate 510 by a fastening screw 560, the clamping block 520 includes a sliding section 521 and a clamping section 522, the sliding section 521 is slidably connected to the sliding plate 510, and the clamping section 522 is fixed to the sliding plate 510. The plate 510 is located on both sides of the synchronous belt, and the clamping hole 523 is located on the sliding section 521. The side of the clamping hole 523 in contact with the inclined block 531 is inclined so that there is surface contact between the clamping hole 523 and the inclined block 531. A limiting block 511 is provided on the sliding plate 510, and a limiting groove 532 is provided on the switching block 530. The limiting groove 532 is a waist-shaped groove, and the limiting block 511 is a waist-shaped block. The clamping hole 523 is slidably connected to the limiting block 511.

[0076] As a preferred implementation in this embodiment, an elastic block 580 is also fixedly connected to the clamping hole 523. The elastic block 580 is an elastic rubber block. The elastic block 580 is fixedly connected to the inner side of the clamping hole 523 by gluing. The elastic block 580 is slidingly connected to the switching block 530. When the clamping block 520 clamps the synchronous belt, the elastic block 580 is compressed.

[0077] As a preferred implementation in this embodiment, a damping block 570 is provided on the inner side of the slider 502. The damping block 570 is embedded in the slider 502, so that the slider 502 and the guide rail 420 damp the sliding, so that the sliding assembly 500 can stop quickly to improve the accuracy of the position control of the laser generating unit 200. The slider 502 is a rubber block.

[0078] As a preferred implementation in this embodiment, Figure 9 As shown, the switching component 540 includes:

[0079] A driving plate 541 , the driving plate 541 being fixedly connected to the switching block 530 , and having a threaded hole;

[0080] The driving motor 543 is fixedly connected to the inner side of the upper cover 550 . A screw 542 is provided on the output shaft of the driving motor 543 . The screw 542 is threadedly connected to the threaded hole.

[0081] Specifically, in this embodiment, a motor slot structure is provided in the upper cover 550, and the drive motor 543 is fixedly connected to the motor slot by screws or adhesive. A screw 542 is fixed to the output shaft of the drive motor 543 by welding. Clamping slots 533 are provided on both sides of the switching block 530, and the drive plate 541 is clamped in the clamping slots 533.

[0082] The upper cover 550 is fixed to the sliding plate 510 by screws or a snap-fit ​​structure. A connecting piece 501 is provided on the upper cover 550. The laser generating unit 200 and the visual acquisition unit 300 are installed on the connecting piece 501. The connecting piece 501 can be a threaded hole or a guide rail structure.

[0083] The terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The singular forms "a," "the," and "the" used in this invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0084] It should be understood that although the terms "first," "second," "third," etc. may be used in the present invention to describe various information, such information should not be limited to these terms. These terms are merely used to distinguish information of the same type from one another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. Depending on the context, the term "if" as used herein may be interpreted as "when," "when," or "in response to determining."

[0085] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-layer corrugated cardboard production equipment, characterized in that: The production equipment includes: A laser generating unit, wherein the laser generating unit comprises a plurality of laser emitting units, each of which is capable of generating a cross-shaped linear laser, wherein the linear laser is irradiated onto the corrugated cardboard and generates a linear light spot on the corrugated cardboard; A visual acquisition unit, used to acquire an image of the corrugated cardboard containing a linear light spot, wherein a plurality of visual acquisition units are provided, and each visual acquisition unit corresponds to a laser emitting unit; a calculation unit, the calculation unit being electrically connected to the visual acquisition unit, and the calculation unit determining the flatness of the corrugated cardboard based on the straightness of the linear light spot of the image; A position adjustment unit is used to adjust the distance between each laser generating unit and the visual acquisition unit so that the linear laser generated by each laser emitting unit can be irradiated onto a piece of divided corrugated cardboard, wherein the position adjustment unit includes a linear displacement component and a sliding component, the linear displacement component includes a guide rail and two synchronous belt components with opposite transmission directions, the sliding component is slidably connected to the guide rail, and a clamping mechanism and a switching component are provided in the sliding component, the switching component controls the clamping mechanism to clamp or release the linear displacement component, so that the sliding component is driven by the clamped synchronous belt component to slide on the guide rail.

2. The multi-layer corrugated cardboard production equipment according to claim 1, characterized in that: The midline of the diagonal angle of the linear light spot along the moving direction of the corrugated cardboard coincides with the moving direction of the corrugated cardboard.

3. The multi-layer corrugated cardboard production equipment according to claim 1, characterized in that: The calculation unit calculates the straightness of the linear laser including the following steps: Step S1, average extraction includes extracting the coordinates of multiple points on the linear laser in the image; Step S2, fitting a curve function formed by multiple points; Step S3: judging the flatness of the corrugated cardboard based on the fitting curve. When the fitting curve is a straight line, the flatness of the corrugated cardboard is judged to be qualified. When the fitting curve is not a straight line, the flatness of the corrugated cardboard is judged to be unqualified.

4. The multi-layer corrugated cardboard production equipment according to claim 3, characterized in that: When the fitting curve is not a straight line, the curvature of the fitting curve is judged. When the curvature is lower than the preset value, the flatness of the corrugated cardboard is judged to be qualified. When the curvature is greater than the preset value, the flatness of the corrugated cardboard is judged to be unqualified.

5. The multi-layer corrugated cardboard production equipment according to claim 4, characterized in that: The intersection point of the linear light spots is located on the center line of the corrugated cardboard.

6. The multi-layer corrugated cardboard production equipment according to claim 2, characterized in that , the clamping mechanism comprises: A sliding plate, the sliding plate being slidably connected to the guide rail, and having through-hole structures at both ends of the sliding plate; A clamping block, the clamping block having an L-shaped structure, the clamping block being slidably connected to the through-hole structure, the portion of the clamping block parallel to the sliding plate and the sliding plate being respectively located on both sides of the synchronous belt on the synchronous belt assembly, and a clamping hole being provided at one end of the clamping block connected to the sliding plate; A switching block is slidably connected to the sliding plate, and inclined blocks are provided at both ends of the switching block. The inclined blocks are located inside the clamping hole. When the switching block slides toward the clamping block, the inclined blocks lift the clamping block so that the clamping block moves toward the sliding plate, thereby clamping the synchronous belt.

7. The multi-layer corrugated cardboard production equipment according to claim 6, characterized in that , the sliding plate is dampingly connected to the guide rail.

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