Paper production line qualified product detection device

Abstract

The invention relates to the technical field of paper production line detection equipment, and particularly discloses a paper production line qualified product detection device which comprises a conveying mechanism, a detection mechanism and a rejection mechanism. The detection mechanism is arranged on a conveying path of the conveying mechanism and is used for automatically detecting the thickness and the folding state of paper, the rejecting mechanism is arranged at the tail end of the conveying direction of the conveying mechanism and is electrically connected with the detection mechanism, and when the detection mechanism detects that the paper is qualified, the rejecting mechanism is electrically connected with the detection mechanism. The rejecting mechanism receives the paper conveyed on the conveying mechanism, and when the detection mechanism detects that the paper is an unqualified product, the rejecting mechanism rejects the paper conveyed to the tail end of the conveying mechanism. The method has the effect of improving the detection efficiency and the detection accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of paper production line detection equipment, and in particular to a device for detecting qualified products of a paper production line. Background Art

[0002] In the paper production line, the processing of books, booklets, etc. requires multiple processes, including the important step of folding. However, in the current folding process, problems such as uneven page thickness, folding warping, and misaligned fold edges often occur, which seriously affect the quality of paper products.

[0003] In order to improve the quality of paper production, existing paper production lines are usually equipped with detection devices to select unqualified products. However, traditional detection devices and detection methods usually rely on manual visual inspection or use simple mechanical detection devices, which have low detection efficiency and low detection accuracy. This problem needs to be solved urgently. Summary of the invention

[0004] In order to improve detection efficiency and detection accuracy, the present application provides a device for detecting qualified products in a paper production line.

[0005] The present application provides a paper production line qualified product detection device, which adopts the following technical solution: A qualified product detection device for a paper production line, comprising: A conveying mechanism, wherein the conveying mechanism is arranged on a paper production line for automatically conveying paper; A detection mechanism, the detection mechanism is arranged on the conveying path of the conveying mechanism to automatically detect the thickness and folding state of the paper; The rejecting mechanism is arranged at the tail end of the conveying direction of the conveying mechanism, and the rejecting mechanism is electrically connected to the detection mechanism. When the detection mechanism detects that the paper is a qualified product, the rejecting mechanism receives the paper conveyed on the conveying mechanism; when the detection mechanism detects that the paper is an unqualified product, the rejecting mechanism rejects the paper conveyed to the tail end of the conveying mechanism.

[0006] By adopting the above technical solution, the conveying mechanism automatically conveys the paper. During the conveying process, the detection mechanism automatically detects the thickness and folding state of the paper on the conveying path of the conveying mechanism. When the detection mechanism detects that the thickness and folding state of the paper meet the standards and are qualified products, the rejection mechanism takes over the paper on the conveying mechanism so that the qualified paper can continue to run on the paper production line. When the detection mechanism detects that the thickness or folding state of the paper does not meet the standards and is a defective product, the rejection mechanism rejects the defective paper conveyed to the tail end of the conveying mechanism. Automated conveying and automatic detection are conducive to improving the efficiency and accuracy of paper detection.

[0007] Preferably, the conveying mechanism includes a first conveying frame, a first conveying assembly and a clamping assembly, wherein the first conveying assembly is arranged on the top of the first conveying frame for automatically conveying paper, and the clamping assembly is arranged on the top of the first conveying frame for flattening the paper being conveyed.

[0008] By adopting the above technical solution, the first conveying frame supports the first conveying assembly and the clamping assembly, the first conveying assembly automatically conveys the paper, and during the paper conveying process, the clamping assembly flattens the paper being conveyed, which is beneficial to improving the accuracy of the detection mechanism in detecting the paper.

[0009] Preferably, the first conveying assembly includes a first conveying plate, a first conveying roller and a first conveying belt, the number of the first conveying rollers is set to two, the two first conveying rollers are rotatably connected to the head and tail ends of the first conveying frame, the first conveying belt surrounds the two first conveying rollers, the first conveying plate is fixedly arranged on the top of the first conveying frame, the first conveying plate is provided with a first accommodating groove for accommodating the first conveying belt, and the first conveying belt and the first conveying plate are located on the same plane.

[0010] By adopting the above technical solution, the first conveyor plate supports the paper, which is beneficial to improving the flatness of the paper during the conveying process, thereby helping to improve the detection accuracy of the detection mechanism. When the paper is placed on the first conveyor plate, the first conveyor roller rotates to drive the first conveyor belt to drive, and the driven first conveyor belt drives the paper to be automatically conveyed. The first conveyor belt is accommodated in the first accommodating groove, so that the first conveyor belt and the first conveyor plate are located on the same plane, which is beneficial to further improve the flatness of the paper during the conveying process.

[0011] Preferably, the clamping assembly includes a support rod, a connecting block and a pressure wheel, the support rod is fixedly arranged on the top of the first conveying frame, the support rod is located above the first conveying plate, the support rod is perpendicular to the first conveying belt, one end of the connecting block is arranged on the support rod, the pressure wheel is rotatably connected to the other end of the connecting block, the pressure wheel is located above the first conveying plate, there is a gap between the pressure wheel and the first conveying plate for paper to pass through, and the pressure wheel presses against the upper surface of the paper.

[0012] By adopting the above technical solution, the support rod supports the connecting block and the pressure wheel. The paper passes through the gap between the first conveying plate and the pressure wheel under the drive of the first conveyor belt. The pressure wheel presses the upper surface of the paper to prevent the paper from bulging during the conveying process, which is beneficial to improve the detection accuracy of the subsequent detection mechanism.

[0013] Preferably, the detection mechanism includes a detection box, a thickness sensor and an image collector, the detection box is fixedly mounted on the first conveyor frame, and the detection box cover is arranged at any section in the length direction of the first conveyor plate, the thickness sensor is arranged inside the detection box to detect the thickness of the paper, and the image collector is arranged inside the detection box to capture the folding image of the paper, and the thickness sensor and the image collector are both electrically connected to the rejection mechanism.

[0014] By adopting the above technical solution, when the paper is conveyed to the detection box, the thickness sensor in the detection box detects the thickness of the paper and feeds back the thickness result to the rejection mechanism. At the same time, the image collector captures the folded image of the paper and feeds back the image result to the rejection mechanism. The thickness sensor and the image collector work simultaneously, which is conducive to improving the detection efficiency.

[0015] Preferably, the rejecting mechanism includes a second conveying frame, a controller, a second conveying plate and a rejecting cylinder, the second conveying frame is arranged behind the conveying direction of the first conveying frame, the end of the second conveying plate away from the first conveying plate is rotatably connected to the second conveying frame, the rejecting cylinder is rotatably connected to the second conveying frame, the piston rod of the rejecting cylinder is rotatably connected to the end of the second conveying plate close to the first conveying plate, the controller pre-stores the thickness threshold value and folding image of qualified paper products, the controller is electrically connected to the thickness sensor, the image collector and the rejecting cylinder, and when the thickness sensor detects When the paper meets the thickness threshold pre-stored in the controller and the image collector detects that the paper meets the folding image pre-stored in the controller, the controller controls the reject cylinder to move so that the second conveying plate and the first conveying plate are located in the same plane; when the thickness sensor detects that the paper does not meet the thickness threshold pre-stored in the controller or the image collector detects that the paper does not meet the folding image pre-stored in the controller, the controller controls the reject cylinder to move upward so that the second conveying plate and the first conveying plate are located in different planes, and there is a gap between the second conveying plate and the first conveying plate for defective paper to pass through.

[0016] By adopting the above technical solution, the second conveyor frame supports the controller, the second conveyor plate and the reject cylinder, and the detection mechanism feeds back the detection result to the controller. When the thickness sensor detects that the paper meets the thickness threshold pre-stored in the controller and the image collector detects that the paper meets the folding image pre-stored in the controller, the controller controls the reject cylinder to move so that the second conveyor plate and the first conveyor plate are located in the same plane, so that qualified paper products are conveyed to the second conveyor plate and continue to be conveyed on the paper production line. When the thickness sensor detects that the paper does not meet the thickness threshold pre-stored in the controller or the image collector detects that the paper does not meet the folding image pre-stored in the controller, the controller controls the reject cylinder to move upward so that the end of the second conveyor plate close to the first conveyor plate is higher than the first conveyor plate. At this time, there is a gap between the second conveyor plate and the first conveyor plate for defective paper products to penetrate, so that the defective paper products are conveyed to the bottom of the second conveyor plate to achieve the rejection of defective paper products.

[0017] Preferably, the rejection mechanism further comprises a collection box, and the collection box is arranged at the bottom of the second conveying frame, and the collection box is located below the position where the first conveying plate and the second conveying plate are close to each other.

[0018] By adopting the above technical solution, the collection box is located below the position where the first conveying plate and the second conveying plate are close to each other to collect the rejected defective paper products, thereby facilitating the processing of the defective paper products.

[0019] Preferably, a second conveying assembly is provided on the second conveying plate, and the second conveying assembly is used to continue conveying qualified paper products.

[0020] By adopting the above technical solution, the second conveying component continues to convey the qualified paper products, so that the qualified paper products continue to circulate in the paper production line.

[0021] Preferably, the second conveying assembly includes a second conveying roller and a second conveying belt, the number of the second conveying rollers is set to two, the two second conveying rollers are rotatably connected to the head and tail ends of the second conveying frame, the second conveying belt surrounds the two second conveying rollers, the second conveying plate is provided with a second accommodating groove for accommodating the second conveying belt, and the second conveying belt and the second conveying plate are located on the same plane.

[0022] By adopting the above technical solution, when the qualified paper is conveyed to the second conveyor plate, the second conveyor roller rotates to drive the second conveyor belt, and the driven second conveyor belt drives the paper to continue to be conveyed automatically. The second conveyor belt is accommodated in the second accommodating groove, so that the second conveyor belt and the second conveyor plate are located on the same plane, which is beneficial to improve the flatness of the paper during transportation on the production line.

[0023] Preferably, the connecting block is rotatably sleeved on the supporting rod.

[0024] By adopting the above technical solution, when the thickness of the paper changes, the width of the gap between the strip pressure wheel and the first conveying plate can be adjusted by rotating the connecting block, which is beneficial to improving applicability.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting up a conveying mechanism, a detection mechanism and a rejection mechanism, the conveying mechanism automatically conveys the paper. During the conveying process, the detection mechanism automatically detects the thickness and folding state of the paper on the conveying path of the conveying mechanism. When the detection mechanism detects that the thickness and folding state of the paper meet the standards and are qualified products, the rejection mechanism takes over the paper on the conveying mechanism so that the qualified paper can continue to run on the paper production line. When the detection mechanism detects that the thickness or folding state of the paper does not meet the standards and is a defective product, the rejection mechanism will reject the defective paper conveyed to the tail end of the conveying mechanism. Automated conveying and automatic detection are conducive to improving the efficiency and accuracy of paper detection.

[0026] 2. By providing a first accommodating groove for accommodating the first conveyor belt on the first conveyor plate, the first conveyor belt and the first conveyor plate are located on the same plane, which is beneficial to improving the flatness of the paper during the conveying process, thereby facilitating improving the detection accuracy of the detection mechanism.

[0027] 3. By setting a support rod, a connecting block and a pressure wheel, the support rod supports the connecting block and the pressure wheel. Driven by the first conveyor belt, the paper passes through the gap between the first conveyor plate and the pressure wheel. The pressure wheel presses the upper surface of the paper to prevent the paper from bulging during transportation, which is beneficial to improve the detection accuracy of the subsequent detection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the qualified product detection device in the embodiment of the present application.

[0029] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0030] Figure 3 It is a schematic diagram of the structure inside the detection box in the embodiment of the present application.

[0031] Description of reference numerals: 1. Conveying mechanism; 11. First conveying frame; 12. First conveying assembly; 121. First conveying plate; 122. First conveying roller; 123. First conveying belt; 13. Pressing assembly; 131. Support rod; 132. Connecting block; 133. Pressing wheel; 2. Detecting mechanism; 21. Detecting box; 22. Thickness sensor; 23. Image collector; 3. Rejecting mechanism; 31. Second conveying frame; 32. Controller; 33. Second conveying plate; 34. Rejecting cylinder; 35. Collecting box; 4. First accommodating tank; 5. Second conveying assembly; 51. Second conveying roller; 52. Second conveying belt; 6. Second accommodating tank. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-3 This application is described in further detail.

[0033] The present application embodiment discloses a device for detecting qualified products of a paper production line, referring to Figure 1 , including a conveying mechanism 1, a detection mechanism 2 and a rejection mechanism 3. The conveying mechanism 1 is arranged on a paper production line for automatically conveying paper. The detection mechanism 2 is arranged on a conveying path of the conveying mechanism 1 to automatically detect the thickness and folding state of the paper. The rejection mechanism 3 is arranged at the tail end of the conveying direction of the conveying mechanism 1, and the rejection mechanism 3 is electrically connected to the detection mechanism 2. The rejection mechanism 3 can receive the detection result of the detection mechanism 2 and respond to the paper. When the detection mechanism 2 detects that the paper is a qualified product, the rejection mechanism 3 takes over the paper conveyed on the conveying mechanism 1 and continues to convey the qualified paper backward on the production line. When the detection mechanism 2 detects that the paper is an unqualified product, the rejection mechanism 3 rejects the paper conveyed to the tail end of the conveying mechanism 1. The degree of automation is high, which is conducive to improving the detection efficiency and accuracy of the paper.

[0034] Reference Figure 1 The conveying mechanism 1 includes a first conveying frame 11, a first conveying assembly 12 and a pressing assembly 13. The first conveying frame 11 supports the first conveying assembly 12 and the pressing assembly 13. The first conveying assembly 12 is arranged on the top of the first conveying frame 11 for automatically conveying paper. In this embodiment, the top of the first conveying frame 11 is arranged horizontally. At the same time, when the paper is conveyed by the first conveying assembly 12, the pressing assembly 13 is arranged on the top of the first conveying frame 11 for flattening the paper being conveyed to improve the flatness of the paper during the conveying process, which is beneficial to improve the accuracy of the subsequent detection mechanism 2 when detecting the paper.

[0035] Reference Figure 1 and Figure 2The first conveying assembly 12 includes a first conveying plate 121, a first conveying roller 122 and a first conveying belt 123. The number of the first conveying rollers 122 is set to two. The two first conveying rollers 122 are rotatably connected to the first and second ends of the first conveying frame 11. It should be noted that the rotation of the first conveying rollers 122 is driven by a motor, which will not be described in detail here. The first conveying belt 123 surrounds the two first conveying rollers 122. The first conveying plate 121 is horizontally fixedly arranged on the top of the first conveying frame 11. The first conveying rollers 122 are driven to rotate by the motor, so that the two first conveying rollers 122 drive the first conveying belt 123 to drive. In addition, the first conveying plate 121 is provided with a first accommodating groove 4 for accommodating the first conveying belt 123 along the conveying direction of the paper. The first conveying belt 123 and the first conveying plate 121 are located on the same plane to ensure the flatness of the paper bearing plane, which is conducive to improving the flatness of the paper during transportation, and further conducive to improving the accuracy of the subsequent detection mechanism 2 when performing detection operations.

[0036] Reference Figure 1 and Figure 2 The clamping assembly 13 includes a support rod 131, a connecting block 132 and a pressure wheel 133. The support rod 131 is fixedly arranged on the top of the first conveying frame 11. The support rod 131 is located above the first conveying plate 121, and the support rod 131 is perpendicular to the first conveying belt 123. One end of the connecting block 132 is arranged on the support rod 131, and the pressure wheel 133 is rotatably connected to the other end of the connecting block 132. The pressure wheel 133 is located above the first conveying plate 121, and there is a gap between the pressure wheel 133 and the first conveying plate 121 for the paper to pass through, and the pressure wheel 133 presses against the upper surface of the paper. When the paper passes through the gap between the pressure wheel 133 and the first conveying plate 121, the first conveying plate 121 supports the lower surface of the paper, and the pressure wheel 133 presses against the upper surface of the paper, so that the paper flows smoothly on the first conveying plate 121. In addition, the connecting block 132 is rotatably mounted on the support rod 131, so that the staff can adjust the connection angle of the connecting block 132 on the support rod 131, thereby facilitating the adjustment of the gap width between the pressure wheel 133 and the first conveying plate 121 to accommodate the conveying of paper of different thicknesses.

[0037] Reference Figure 1 and Figure 3The detection mechanism 2 includes a detection box 21, a thickness sensor 22 and an image collector 23. The detection box 21 is fixedly arranged on the top of the first conveying frame 11, and the detection box 21 is covered at any section in the length direction of the first conveying plate 121. The thickness sensor 22 is arranged inside the detection box 21 to detect the thickness of the paper. The image collector 23 is arranged inside the detection box 21 to capture the folding image of the paper. The thickness sensor 22 and the image collector 23 are both electrically connected to the rejection mechanism 3. The thickness sensor 22 transmits the detection result of the thickness of the paper to the rejection mechanism 3, and the image collector 23 transmits the detection result of the folding image of the paper to the rejection mechanism 3, so that the rejection mechanism 3 can judge whether the paper is qualified.

[0038] Reference Figure 1 and Figure 2 The rejection mechanism 3 includes a second conveyor frame 31, a controller 32, a second conveyor plate 33 and a rejection cylinder 34. The second conveyor frame 31 is arranged behind the conveying direction of the first conveyor frame 11. The second conveyor plate 33 is arranged on the top of the second conveyor frame 31, and the end of the second conveyor plate 33 away from the first conveyor plate 121 is hinged to the second conveyor frame 31. The end of the second conveyor plate 33 away from the first conveyor plate 121 is a hinged end, and the end of the second conveyor plate 33 close to the first conveyor plate 121 is a movable end. The rejection cylinder 34 is rotatably connected to the bottom of the second conveyor frame 31, and the piston rod of the rejection cylinder 34 is rotatably connected to the end of the second conveyor plate 33 close to the first conveyor plate 121, that is, the piston rod of the rejection cylinder 34 is hinged to the movable end of the second conveyor plate 33. Refer to Figure 3 The controller 32 pre-stores the thickness threshold and folding image of qualified paper products. The controller 32 is electrically connected to the thickness sensor 22, the image collector 23 and the rejection cylinder 34. The thickness sensor 22 transmits the detected paper thickness data to the controller 32, and the image collector 23 simultaneously transmits the detected paper folding image data to the controller 32.

[0039] When the thickness sensor 22 detects that the paper meets the thickness threshold value pre-stored in the controller 32 and the image collector 23 detects that the paper meets the folding image pre-stored in the controller 32, the controller 32 controls the rejection cylinder 34 to move so that the second conveying plate 33 and the first conveying plate 121 are located in the same plane. At this time, the paper can be conveyed from the first conveying plate 121 to the second conveying plate 33. When the thickness sensor 22 detects that the paper does not meet the thickness threshold value pre-stored in the controller 32 or the image collector 23 detects that the paper does not meet the folding image pre-stored in the controller 32 or the paper thickness and folding images do not meet, the controller 32 controls the rejection cylinder 34 to move upward so that the second conveying plate 33 and the first conveying plate 121 are located in different planes, the movable end of the second conveying plate 33 is lifted upward, and there is a gap between the second conveying plate 33 and the first conveying plate 121 for defective paper to penetrate. At this time, the paper is conveyed from the first conveying plate 121 to the bottom of the second conveying plate 33 to complete the rejection operation of defective paper.

[0040] Reference Figure 1 The rejecting mechanism 3 also includes a collecting box 35, which is arranged at the bottom of the second conveying frame 31, and the collecting box 35 is located below the first conveying plate 121 and the second conveying plate 33, so as to collect defective paper products for easy processing.

[0041] Reference Figure 1 The second conveying plate 33 is provided with a second conveying assembly 5, which is used to continue conveying qualified paper products on the paper production line. Specifically, the second conveying assembly 5 includes a second conveying roller 51 and a second conveying belt 52. The number of the second conveying rollers 51 is set to two. The two second conveying rollers 51 are rotatably connected to the head and tail ends of the second conveying frame 31. The rotation of the second conveying rollers 51 is also driven by a motor, which will not be described in detail here. The second conveying belt 52 surrounds the two second conveying rollers 51. The second conveying plate 33 is provided with a second accommodating groove 6 for accommodating the second conveying belt 52. The second conveying belt 52 and the second conveying plate 33 are located on the same plane to ensure the flatness of the paper when it continues to be conveyed.

[0042] The implementation principle of a qualified product detection device for a paper production line in the embodiment of the present application is as follows: the first conveyor belt 123 drives the paper to be conveyed on the first conveyor plate 121, and the pressure wheel 133 presses the paper being conveyed to ensure the flatness of the paper during the conveying process. During the conveying process of the paper, the thickness sensor 22 detects the thickness of the paper and transmits it to the controller 32, and the image collector 23 captures the folding image of the paper and transmits it to the controller 32. When the thickness sensor 22 detects that the paper meets the thickness threshold pre-stored in the controller 32 and the image collector 23 detects that the paper meets the folding image pre-stored in the controller 32, the controller 32 controls the rejection cylinder 34 to move so that the second conveyor plate 33 and the first conveyor plate 121 are located in the same plane. At this time, the paper can be conveyed from the first conveyor plate 121 to the second conveyor plate 121. The second conveying plate 33 continues to be conveyed on the paper production line. When the thickness sensor 22 detects that the paper does not meet the thickness threshold pre-stored in the controller 32 or the image collector 23 detects that the paper does not meet the folding image pre-stored in the controller 32 or both the paper thickness and folding images do not meet the requirements, the controller 32 controls the rejection cylinder 34 to move upward so that the second conveying plate 33 and the first conveying plate 121 are located in different planes, and the movable end of the second conveying plate 33 is lifted upward. There is a gap between the second conveying plate 33 and the first conveying plate 121 for defective paper to penetrate. At this time, the paper is conveyed from the first conveying plate 121 to the bottom of the second conveying plate 33 and falls into the collection box 35 for collection, so as to complete the rejection operation of defective paper. Automated conveying and automatic detection are conducive to improving the efficiency and accuracy of paper detection.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A paper production line qualified product detection device, characterized in that: include: A conveying mechanism (1), wherein the conveying mechanism (1) is arranged on a paper production line and is used for automatically conveying paper; A detection mechanism (2), the detection mechanism (2) being arranged on the conveying path of the conveying mechanism (1) to automatically detect the thickness and folding state of the paper; A rejection mechanism (3) is provided at the rear end of the conveying mechanism (1) in the conveying direction. The rejection mechanism (3) is electrically connected to the detection mechanism (2). When the detection mechanism (2) detects that the paper is a qualified product, the rejection mechanism (3) receives the paper conveyed on the conveying mechanism (1); when the detection mechanism (2) detects that the paper is a defective product, the rejection mechanism (3) rejects the paper conveyed to the rear end of the conveying mechanism (1).

2. A paper production line qualified product detection device according to claim 1, characterized in that: The conveying mechanism (1) comprises a first conveying frame (11), a first conveying assembly (12) and a pressing assembly (13); the first conveying assembly (12) is arranged on the top of the first conveying frame (11) for automatically conveying paper; and the pressing assembly (13) is arranged on the top of the first conveying frame (11) for flattening the paper being conveyed.

3. A paper production line qualified product detection device according to claim 2, characterized in that: The first conveying assembly (12) comprises a first conveying plate (121), a first conveying roller (122) and a first conveying belt (123); the number of the first conveying rollers (122) is set to two, the two first conveying rollers (122) are rotatably connected to the head and tail ends of the first conveying frame (11), the first conveying belt (123) surrounds the two first conveying rollers (122), the first conveying plate (121) is fixedly arranged on the top of the first conveying frame (11), the first conveying plate (121) is provided with a first accommodating groove (4) for accommodating the first conveying belt (123), and the first conveying belt (123) and the first conveying plate (121) are located on the same plane.

4. A paper production line qualified product detection device according to claim 3, characterized in that: The clamping assembly (13) comprises a support rod (131), a connecting block (132) and a pressure wheel (133); the support rod (131) is fixedly arranged on the top of the first conveying frame (11); the support rod (131) is located above the first conveying plate (121); the support rod (131) is perpendicular to the first conveying belt (123); one end of the connecting block (132) is arranged on the support rod (131); the pressure wheel (133) is rotatably connected to the other end of the connecting block (132); the pressure wheel (133) is located above the first conveying plate (121); there is a gap between the pressure wheel (133) and the first conveying plate (121) for paper to pass through; the pressure wheel (133) is pressed against the upper surface of the paper.

5. The device for detecting qualified products of a paper production line according to claim 3, characterized in that: The detection mechanism (2) comprises a detection box (21), a thickness sensor (22) and an image collector (23); the detection box (21) is fixedly arranged on the first conveying frame (11), and the detection box (21) is covered on any section in the length direction of the first conveying plate (121); the thickness sensor (22) is arranged inside the detection box (21) for detecting the thickness of the paper; the image collector (23) is arranged inside the detection box (21) for capturing the folding image of the paper; the thickness sensor (22) and the image collector (23) are both electrically connected to the rejection mechanism (3).

6. A paper production line qualified product detection device according to claim 5, characterized in that: The rejecting mechanism (3) comprises a second conveying frame (31), a controller (32), a second conveying plate (33) and a rejecting cylinder (34); the second conveying frame (31) is arranged behind the first conveying frame (11) in the conveying direction; the end of the second conveying plate (33) away from the first conveying plate (121) is rotatably connected to the second conveying frame (31); the rejecting cylinder (34) is rotatably connected to the second conveying frame (31); the piston rod of the rejecting cylinder (34) is rotatably connected to the end of the second conveying plate (33) close to the first conveying plate (121); the controller (32) pre-stores the thickness threshold value and folding image of qualified paper products; the controller (32) is electrically connected to the thickness sensor (22), the image collector (23) and the rejecting cylinder (34); when the thickness sensor ( When the thickness sensor (22) detects that the paper meets the thickness threshold value pre-stored in the controller (32) and the image collector (23) detects that the paper meets the folding image pre-stored in the controller (32), the controller (32) controls the rejecting cylinder (34) to move so that the second conveying plate (33) and the first conveying plate (121) are located in the same plane; when the thickness sensor (22) detects that the paper does not meet the thickness threshold value pre-stored in the controller (32) or the image collector (23) detects that the paper does not meet the folding image pre-stored in the controller (32), the controller (32) controls the rejecting cylinder (34) to move upward so that the second conveying plate (33) and the first conveying plate (121) are located in different planes, and there is a gap between the second conveying plate (33) and the first conveying plate (121) for defective paper to pass through.

7. A paper production line qualified product detection device according to claim 6, characterized in that: The rejecting mechanism (3) further comprises a collecting box (35), wherein the collecting box (35) is arranged at the bottom of the second conveying frame (31), and the collecting box (35) is located below the position where the first conveying plate (121) and the second conveying plate (33) are close to each other.

8. The device for detecting qualified products of a paper production line according to claim 6, characterized in that: The second conveying plate (33) is provided with a second conveying assembly (5), and the second conveying assembly (5) is used to continue conveying qualified paper products.

9. A paper production line qualified product detection device according to claim 8, characterized in that: The second conveying assembly (5) comprises a second conveying roller (51) and a second conveying belt (52). The number of the second conveying rollers (51) is set to two. The two second conveying rollers (51) are rotatably connected to the head and tail ends of the second conveying frame (31). The second conveying belt (52) surrounds the two second conveying rollers (51). The second conveying plate (33) is provided with a second accommodating groove (6) for accommodating the second conveying belt (52). The second conveying belt (52) and the second conveying plate (33) are located on the same plane.

10. The device for detecting qualified products of a paper production line according to claim 4, characterized in that: The connecting block (132) is rotatably sleeved on the supporting rod (131).

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