Double-sided detection equipment based on printed articles

Abstract

The invention relates to the field of printed matter detection, and discloses a printed matter-based double-sided detection device, which comprises a mounting bracket, a mounting ring with a horizontal axis is arranged on the mounting bracket, a conveying assembly is arranged in the mounting ring through a connecting assembly, and a driving assembly is arranged on the mounting bracket. The driving assembly is used for driving the conveying assembly to rotate around the axis of the mounting ring, the conveying assembly comprises two conveying units with the conveying direction parallel to the axis direction of the mounting ring, the two conveying units are arranged in the vertical direction, and the distance between the two conveying units is smaller than the thickness of a to-be-detected printed object; each conveying unit is divided into an overlapping section and an open section in the conveying direction, the overlapping section of the upper conveying unit is located over the overlapping section of the lower conveying unit, the open sections of the two conveying units are oppositely arranged, and the upper portions of the open sections of the two conveying units are each provided with an optical detection unit.

Description

Technical Field

[0001] The invention relates to the field of printed product detection, and in particular to a double-sided detection device based on printed objects. Background Art

[0002] Printed products are a general term for various products produced using printing technology. With the development of printing technology, printed products are used more and more widely in various fields, and the requirements for the printing quality of printed products are also getting higher and higher. Therefore, it is necessary to test the printed products. Some printed products are printed on both sides, so it is necessary to test the printed products on both sides.

[0003] Based on the search for double-sided detection technology for printed products, some existing technologies have been found, which are now introduced one by one:

[0004] First, the Chinese invention patent application with application publication number CN117849060A discloses a print quality inspection device with a double-sided inspection function, which supports the parts of the two sides of the print that are not printed with patterns by two first conveyor belts, and presses the two parts by a pressing component, and then simultaneously inspects the front and back of the print by upper and lower optical inspection modules, so as to achieve the purpose of double-sided simultaneous inspection and improve the inspection efficiency. However, the printed products include not only plate-type printed products, but also silk-type printed products, paper-type printed products, etc. Such printed products are soft, soft, and thin. By pressing and holding the side edges, wrinkles, bends, etc. are easily generated, which will affect the final optical inspection results. Therefore, its use has limitations and needs to be improved.

[0005] Secondly, the Chinese utility model patent with authorization announcement number CN221478692U discloses a printed product quality inspection device, which realizes double-sided inspection of printed products by clamping and turning over the printed products to interchange the front and back sides of the printed products. This method is prone to wrinkles when turning over soft, flexible and thin printed products, which also has limitations and needs to be improved.

[0006] Based on the above, the present invention proposes a double-sided detection device based on printed products for soft, flexible and thin printed products. Summary of the invention

[0007] In order to solve the problems mentioned in the above background, the present invention provides a double-side detection device based on printed objects.

[0008] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0009] A double-sided inspection device based on printed articles comprises a mounting bracket, a mounting ring with a horizontally arranged axis line is arranged on the mounting bracket, a conveying component is arranged in the mounting ring through a connecting component, and the conveying component can rotate around the axis line of the mounting ring, and a driving component is arranged on the mounting bracket, and the driving component is used to provide driving power for the rotation of the conveying component;

[0010] The conveying assembly includes a conveying unit whose conveying direction is parallel to the axis direction of the mounting ring, two conveying units are arranged in the vertical direction, and the distance between the two conveying units is less than the thickness of the printed article to be detected;

[0011] The conveying unit is divided into an overlapping section and an open section along the conveying direction. The overlapping section of the upper conveying unit is located directly above the overlapping section of the lower conveying unit. The open sections of the two conveying units are arranged back to back, and an optical detection unit is respectively provided above the open sections of the two conveying units.

[0012] As a further improvement and optimization of the present invention, an upper mounting plate is respectively provided on the two side surfaces of the mounting bracket along the axial direction of the mounting ring, the two upper mounting plates are respectively located above the open sections of the two conveying units, and the two optical detection units are respectively arranged at the bottom of the two upper mounting plates.

[0013] As a further improvement and optimization of the present invention, the overlapping section and the open section of the conveying unit are equal in length.

[0014] As a further improvement and optimization of the present invention, the connecting assembly includes a gear ring coaxially sleeved on the outer circular surface of the mounting ring, an arc plate is coaxially fixedly provided on the inner wall of the gear ring, an annular avoidance groove is coaxially penetrated through the inner circular surface of the mounting ring, a connecting rod is provided on the inner arc surface of the arc plate, and a connecting bracket is fixedly provided on the end of the connecting rod after passing through the annular avoidance groove, and the connecting bracket is connected to the conveying unit.

[0015] As a further improvement and optimization of the present invention, the conveying unit includes an inner skeleton fixedly connected to a connecting bracket, a conveyor pulley is installed at each end of the inner skeleton, a conveyor belt is arranged between the two conveyor pulleys and the inner skeleton supports the conveyor belt from the inside, and a conveying motor is arranged on one side of the inner skeleton, and the conveying motor forms a power connection with any one of the conveyor pulleys.

[0016] As a further improvement and optimization of the present invention, the driving assembly includes a driving motor arranged on the mounting bracket, and a gear is arranged at the output end of the driving motor, and the gear is meshed with the ring gear.

[0017] As a further improvement and optimization of the present invention, a protective cover shell is provided on the outside of the mounting ring, and the protective cover shell includes two semi-arc shells in an arc shape, and the two semi-arc shells together constitute a complete cylindrical cover shell, the cylindrical cover shell is sleeved on the outside of the mounting ring and the gear ring is located inside the cylindrical cover shell, the inner ring surface of the cylindrical cover shell is open, and a notch is provided at the bottom of the cylindrical cover shell, and the notch is used to avoid the meshing of the gear and the gear ring, and there is a lower shield plate on both sides of the notch extending downward, and the two lower shield plates are respectively located on both sides of the gear.

[0018] As a further improvement and optimization of the present invention, a plurality of marking lines are arranged in an array along the extension direction on the outer surface of the conveyor belt.

[0019] There are two processes for testing printed products.

[0020] The first one:

[0021] Step 1: Lay the printed product flat on the open section of the conveying unit below, and perform optical detection of the front side of the printed product through the corresponding optical detection unit;

[0022] Step 2: The two conveying units are started synchronously and the movement directions and speeds of the two conveying units when pulling the object are consistent, so that the printed product is clamped by the overlapping sections of the two conveying units;

[0023] Step 3: The driving motor is started to drive the conveying assembly to rotate 180 degrees around the mounting ring, the upper and lower positions of the two conveying units are reversed, and the front and back sides of the printed products are reversed;

[0024] Step 4: The two conveying units are started synchronously and the movement direction and speed of the traction object remain consistent, so that the printed product leaves the overlapping section of the conveying unit and is located on the open section of the conveying unit, and the optical detection of the back of the printed product is achieved through the corresponding optical detection unit.

[0025] Second type:

[0026] Step 1: Place the printed product flat on the open section of the lower conveying unit, start the two conveying units synchronously and move the objects in the same direction, the upper conveying unit moves faster than the lower conveying unit, so as to flatten and correct the wrinkles of the printed product;

[0027] Step 2: The two conveying units pull the object to move at the same speed and in the same direction, and pull the flattened printed product to the open section of the lower conveying unit, and perform optical detection of the front side of the printed product through the corresponding optical detection unit;

[0028] Step 3: The two conveying units are started synchronously and the movement directions and speeds of the two conveying units when pulling the object are consistent, so that the printed product is clamped by the overlapping sections of the two conveying units;

[0029] Step 4: The driving motor is started to drive the conveying assembly to rotate 180 degrees around the mounting ring, the upper and lower positions of the two conveying units are reversed, and the front and back sides of the printed products are reversed;

[0030] Step 5: The two conveying units are started synchronously and the movement direction and speed of the traction object remain consistent, so that the printed product leaves the overlapping section of the conveying unit and is located on the open section of the conveying unit, and optical detection of the back of the printed product is achieved through the corresponding optical detection unit.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This solution can realize double-sided inspection of soft, thin and flexible printed products. On this basis:

[0033] On the one hand, the present solution has a simple structure. The driving assembly drives the conveying assembly to rotate around the axis of the mounting ring, and the two conveyor belts of the conveying assembly cooperate to clamp the printed product. During the clamping process and in the process of pulling the printed product to move to the open section of the conveyor belt after clamping, the two conveyor belts pull the object in the same direction and speed. Therefore, the printed product will not be wrinkled or bent. The printed product remains flat and is supported by the conveyor belt below, thereby realizing optical detection of soft, thin, and flexible printed products with high accuracy.

[0034] On the other hand, the cooperation of the two conveyor belts can also correct wrinkles in printed products. Specifically, the two conveying units have the same movement direction when pulling objects, but the movement speeds are inconsistent. The movement speed of the upper conveying unit is greater than that of the lower conveying unit. In this way, when the printed product is clamped by the two conveyor belts, after one side of the printed product is just clamped, the pulling movement speed of the upper conveyor belt is faster. Therefore, it is equivalent to: taking the lower conveyor belt as a reference, the lower conveyor belt does not move, and the upper conveyor belt moves at the speed difference between the two, and pulls the printed product to move, thereby flattening and correcting the wrinkles of the printed product. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0036] Figure 2 It is a front view of the present invention;

[0037] Figure 3A schematic diagram of the protective cover, mounting bracket and mounting ring;

[0038] Figure 4 A schematic diagram of the installation ring, connecting components and driving components;

[0039] Figure 5 is a schematic diagram of a connecting component and a conveying component;

[0040] Figure 6 It is a schematic diagram of the conveying assembly, the arc plate and the connecting bracket;

[0041] Figure 7 An exploded view of the conveyor assembly.

[0042] The reference numerals in the accompanying drawings are:

[0043] 100, mounting bracket; 101, mounting ring; 1011, annular avoidance groove; 102, connecting assembly; 1021, gear ring; 1022, arc plate; 1023, connecting bracket; 103, conveying assembly; 1031, inner skeleton; 1032, conveyor pulley; 1033, conveyor belt; 1034, conveying motor; 1035, marking line; 104, driving assembly; 1041, driving motor; 1042, gear; 105, upper mounting plate; 106, optical detection unit; 107, protective cover shell; 1071, semi-arc shell; 1072, lower shield plate. DETAILED DESCRIPTION

[0044] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0045] Reference Figure 1-Figure 7 A double-sided detection device based on printed items includes a mounting bracket 100, on which a mounting ring 101 with a horizontally arranged axis is arranged, and a conveying component 103 is arranged in the mounting ring 101 through a connecting component 102. The conveying component 103 can rotate around the axis of the mounting ring 101, and a driving component 104 is arranged on the mounting bracket 100. The driving component 104 is used to provide driving power for the rotation of the conveying component 103.

[0046] The conveying assembly 103 includes a conveying unit whose conveying direction is parallel to the axial direction of the mounting ring 101. Two conveying units are arranged in the vertical direction. Furthermore, the gap between the two conveying units is slightly smaller than the thickness of the printed article to be inspected. It should be noted that this solution is mainly aimed at the inspection of soft, thin printed articles. Of course, the inspection of plate-type printed products is also possible.

[0047] The conveying unit is divided into an overlapping section and an open section along the conveying direction, wherein the overlapping section of the upper conveying unit is located directly above the overlapping section of the lower conveying unit, that is, they overlap each other, and the open sections of the two conveying units are arranged back to back.

[0048] An upper mounting plate 105 is respectively provided on the two side surfaces of the mounting bracket 100 along the axial direction of the mounting ring 101. The two upper mounting plates 105 are respectively located above the open sections of the two conveying units. An optical detection unit 106 is provided at the bottom of the upper mounting plate 105. The optical detection unit 106 can be realized by existing technology and will not be elaborated herein. For example, it can be a camera or an optical scanning component, etc.

[0049] When the present solution is used, the printed product is laid flat on the open section of the conveying unit below by manual or existing robotic arm technology, and the corresponding optical detection unit 106 is used to perform optical detection of the front side of the printed product. Then the conveying unit is started to pull the printed product forward so that the printed product is clamped by the overlapping sections of the two conveying units. After clamping, the conveying assembly 103 rotates 180 degrees around the mounting ring 101, and the two conveying units are turned upside down. After that, the two conveying units continue to pull the printed product to move so that the printed product is located in the open section of the conveying unit, and the corresponding optical detection unit 106 is used to perform optical detection of the back side of the printed product. At this point, the double-sided detection of the printed product is completed, and during the detection process, the printed product will not be wrinkled or bent, and the detection result has a higher accuracy.

[0050] Furthermore, the front side inspection of multiple printed products can be completed at one time, and then flipped 180 degrees to complete the back side inspection of the printed products. The inspection efficiency is higher. Preferably, the overlapping section and the open section of the conveying unit are equal in length. The significance of this is that the number of printed products that can be inspected at one time is maximized.

[0051] Reference Figure 3-Figure 6 The connecting component 102 includes a gear ring 1021 coaxially sleeved on the outer circular surface of the mounting ring 101, an arc plate 1022 is coaxially fixedly provided on the inner wall of the gear ring 1021, an annular avoidance groove 1011 is coaxially penetrated through the inner circular surface of the mounting ring 101, a connecting rod is provided on the inner arc surface of the arc plate 1022, and a connecting bracket 1023 is fixedly provided on the end of the connecting rod after passing through the annular avoidance groove 1011; therefore, driving the gear ring 1021 to rotate can drive the arc plate 1022 and the connecting bracket 1023 to rotate together.

[0052] Reference Figure 6 and Figure 7The conveying unit includes an inner frame 1031 fixedly connected to the connecting bracket 1023, and a conveyor pulley 1032 is installed at each end of the inner frame 1031. A conveyor belt 1033 is arranged between the two conveyor pulleys 1032, and the inner frame 1031 supports the conveyor belt 1033 from the inside so that the conveyor belt 1033 will not be sunken.

[0053] A conveying motor 1034 is provided on one side of the inner skeleton 1031. The conveying motor 1034 is power-connected to any one of the conveying pulleys 1032. The conveying motor 1034 can drive the conveying pulley 1032 to rotate, thereby moving the conveyor belt 1033. In addition, when the connecting bracket 1023 rotates, it can also rotate with the conveying unit.

[0054] Reference Figure 4 The driving assembly 104 includes a driving motor 1041 arranged on the mounting bracket 100, and a gear 1042 is arranged at the output end of the driving motor 1041. The gear 1042 is meshed with the ring gear 1021. The driving motor 1041 drives the gear 1042 to rotate, and the gear 1042 drives the ring gear 1021 to rotate, thereby driving the conveying unit to rotate around the axis of the mounting ring 101.

[0055] In a preferred embodiment, in order to prevent surrounding objects or staff from accidentally touching the gear ring 1021 or the gear 1042 and causing damage, refer to Figure 1 and Figure 2 , a protective cover 107 is provided outside the mounting ring 101, further, referring to Figure 3 The protective cover 107 includes two arc-shaped semi-arc shells 1071, and the two semi-arc shells 1071 together form a complete cylindrical cover. The cylindrical cover is sleeved on the outside of the mounting ring 101 and the ring gear 1021 is located in the cylindrical cover. The inner ring surface of the cylindrical cover is open, and a notch is provided at the bottom of the cylindrical cover. The notch is used to avoid the meshing of the gear 1042 and the ring gear 1021. There is a lower shield plate 1072 on both sides of the notch extending downward, which is used to cooperate with the mounting bracket 100 to cover the gear 1042. In this way, the ring gear 1021 and the gear 1042 are both shielded, and the safety is higher. In addition, the two semi-arc shells 1071 can be assembled by bonding with an adhesive, or assembled by bolts.

[0056] Preferred embodiment, refer to Figure 7 The outer surface of the conveyor belt 1033 is provided with a plurality of marking lines 1035 in an array along the extension direction. The purpose of the marking lines 1035 is to place the printed product within the marking lines 1035 during the inspection to assist in the accurate placement of the printed product.

[0057] There are many detection methods of the present invention, which are introduced one by one:

[0058] The first one:

[0059] The printed product is laid flat on the open section of the conveyor belt 1033 below by manual or existing mechanical arm technology, and the optical detection of the front side of the printed product is realized by the corresponding optical detection unit 106. After the front detection is completed, the two conveyor units are started synchronously and the movement direction and movement speed of the two conveyor units when pulling the object are consistent. In this way, the printed product can be clamped by the overlapping sections of the two conveyor belts 1033 and the printed product will not be wrinkled during the clamping process;

[0060] After clamping, the driving motor 1041 is started, driving the conveying assembly 103 to rotate 180 degrees around the mounting ring 101, the upper and lower positions of the two conveying units are reversed, and the front and back sides of the printed products are reversed. After that, the two conveying units are started synchronously and the movement direction and movement speed of the pulling object remain consistent, so that the printed products leave the overlapping section and are located on the open section of the conveyor belt 1033, and in this process, the printed products still do not appear wrinkled;

[0061] Then, the optical inspection of the back side of the printed product is performed through the corresponding optical inspection unit 106. Thus, the double-sided inspection of the printed product is completed. During the inspection, the printed product will not be wrinkled or bent, and the inspection result will be more accurate.

[0062] Furthermore, the front side inspection of multiple printed products can be completed at one time, and then the printed products can be flipped 180 degrees to complete the back side inspection, which has a higher inspection efficiency.

[0063] Second type:

[0064] The printed product is laid flat on the open section of the conveyor belt 1033 below by manual or existing robotic arm technology;

[0065] Then, the two conveying units are started synchronously and the two conveying units pull the object to move in the same direction, but the movement speed is inconsistent. The movement speed of the upper conveying unit is greater than that of the lower conveying unit. In this way, when the printed product is clamped by the overlapping sections of the two conveyor belts 1033, after one side of the printed product is just clamped, the pulling movement speed of the upper conveyor belt 1033 is faster. Therefore, it is equivalent to: taking the lower conveyor belt 1033 as a reference, the lower conveyor belt 1033 does not move, and the upper conveyor belt 1033 moves at the speed difference between the two and pulls the printed product to move. In this way, even if the printed product has wrinkles, they will be flattened and corrected.

[0066] Then, the two conveying units pull the object to move at the same speed and direction, and pull the flattened printed product to the open section of the conveyor belt 1033 below. The front side is detected by the corresponding optical detection unit 106, and then the back side of the printed product is optically detected by referring to the first method.

[0067] Of course, this solution can also be used to detect printed products that are only printed on one side.

[0068] From the above we can see that:

[0069] This solution can realize double-sided inspection of soft, thin and flexible printed products. On this basis:

[0070] On the one hand, the present solution has a simple structure. The driving assembly drives the conveying assembly to rotate around the axis of the mounting ring, and the two conveyor belts of the conveying assembly cooperate to clamp the printed product. During the clamping process and in the process of pulling the printed product to move to the open section of the conveyor belt after clamping, the two conveyor belts pull the object in the same direction and speed. Therefore, the printed product will not be wrinkled or bent. The printed product remains flat and is supported by the conveyor belt below, thereby realizing optical detection of soft, thin, and flexible printed products with high accuracy.

[0071] On the other hand, the cooperation of the two conveyor belts can also correct wrinkles in printed products. Specifically, the two conveying units have the same movement direction when pulling objects, but the movement speeds are inconsistent. The movement speed of the upper conveying unit is greater than that of the lower conveying unit. In this way, when the printed product is clamped by the two conveyor belts, after one side of the printed product is just clamped, the pulling movement speed of the upper conveyor belt is faster. Therefore, it is equivalent to: taking the lower conveyor belt as a reference, the lower conveyor belt does not move, and the upper conveyor belt moves at the speed difference between the two, and pulls the printed product to move, thereby flattening and correcting the wrinkles of the printed product.

[0072] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A double-sided inspection device based on printed articles, comprising a mounting bracket (100), characterized in that: The mounting bracket (100) is provided with a mounting ring (101) whose axis is arranged horizontally, a conveying assembly (103) is arranged in the mounting ring (101) through a connecting assembly (102), and the conveying assembly (103) can rotate around the axis of the mounting ring (101), and a driving assembly (104) is provided on the mounting bracket (100), and the driving assembly (104) is used to provide driving power for the rotation of the conveying assembly (103); The conveying assembly (103) comprises a conveying unit whose conveying direction is parallel to the axis direction of the mounting ring (101), two conveying units are arranged in the vertical direction, and the distance between the two conveying units is less than the thickness of the printed article to be detected; The conveying unit is divided into an overlapping section and an open section along the conveying direction. The overlapping section of the upper conveying unit is located directly above the overlapping section of the lower conveying unit. The open sections of the two conveying units are arranged back to back. An optical detection unit (106) is respectively arranged above the open sections of the two conveying units.

2. A double-sided inspection device based on printed articles according to claim 1, characterized in that: An upper mounting plate (105) is respectively arranged on two side surfaces of the mounting bracket (100) along the axial centerline direction of the mounting ring (101); the two upper mounting plates (105) are respectively located above the open sections of the two conveying units; and the two optical detection units (106) are respectively arranged at the bottom of the two upper mounting plates (105).

3. The double-sided inspection device based on printed articles according to claim 1, characterized in that: The overlapping section and the open section of the conveying unit are equal in length.

4. The double-sided inspection device based on printed articles according to claim 1, characterized in that: The connection assembly (102) comprises a gear ring (1021) coaxially sleeved on the outer circumferential surface of the mounting ring (101); an arc plate (1022) is coaxially fixedly arranged on the inner wall of the gear ring (1021); an annular avoidance groove (1011) is coaxially penetrated through the inner circumferential surface of the mounting ring (101); a connecting rod is arranged on the inner arc surface of the arc plate (1022); a connecting bracket (1023) is fixedly arranged on the end of the connecting rod after passing through the annular avoidance groove (1011); and the connecting bracket (1023) is connected to the conveying unit.

5. The double-sided inspection device based on printed articles according to claim 4, characterized in that: The conveying unit comprises an inner frame (1031) fixedly connected to a connecting bracket (1023); a conveying pulley (1032) is respectively installed at both ends of the inner frame (1031); a conveying belt (1033) is arranged between the two conveying pulleys (1032); and the inner frame (1031) internally supports the conveying belt (1033); a conveying motor (1034) is arranged on one side of the inner frame (1031); and the conveying motor (1034) is connected to any one of the conveying pulleys (1032) in a power connection.

6. The double-sided inspection device based on printed articles according to claim 5, characterized in that: The driving assembly (104) comprises a driving motor (1041) arranged on the mounting bracket (100); a gear (1042) is arranged at the output end of the driving motor (1041); and the gear (1042) is meshed with the gear ring (1021).

7. The double-sided inspection device based on printed articles according to claim 6, characterized in that: A protective cover shell (107) is arranged outside the mounting ring (101), and the protective cover shell (107) includes two arc-shaped semi-arc shells (1071). The two semi-arc shells (1071) together form a complete cylindrical cover shell. The cylindrical cover shell is sleeved on the outside of the mounting ring (101) and the gear ring (1021) is located inside the cylindrical cover shell. The inner ring surface of the cylindrical cover shell is open, and a notch is arranged at the bottom of the cylindrical cover shell. The notch is used to avoid meshing of the gear (1042) and the gear ring (1021). There is a lower shield plate (1072) on both sides of the notch extending downward, and the two lower shield plates (1072) are respectively located on both sides of the gear (1042).

8. The double-sided inspection device based on printed articles according to claim 6, characterized in that: The outer surface of the conveyor belt (1033) is provided with a plurality of marking lines (1035) in an array along the extension direction.

9. The double-sided inspection device based on printed articles according to claim 6, characterized in that: The process of testing printed products includes the following steps: Step 1: Lay the printed product flat on the open section of the conveying unit below, and perform optical detection on the front side of the printed product through the corresponding optical detection unit (106); Step 2: The two conveying units are started synchronously and the movement directions and speeds of the two conveying units when pulling the object are consistent, so that the printed product is clamped by the overlapping sections of the two conveying units; Step 3: The driving motor (1041) is started to drive the conveying assembly (103) to rotate 180 degrees around the mounting ring (101), so that the upper and lower positions of the two conveying units are reversed, and the front and back sides of the printed product are reversed; Step 4: The two conveying units are started synchronously and the moving direction and speed of the towing object remain consistent, so that the printed product leaves the overlapping section of the conveying unit and is located on the open section of the conveying unit, and the optical detection of the back of the printed product is achieved through the corresponding optical detection unit (106).

10. The double-sided inspection device based on printed articles according to claim 6, characterized in that: The process of testing printed products includes the following steps: Step 1: Place the printed product flat on the open section of the lower conveying unit, start the two conveying units synchronously and move the objects in the same direction, the upper conveying unit moves faster than the lower conveying unit, so as to flatten and correct the wrinkles of the printed product; Step 2: The two conveying units pull the objects to move at the same speed and in the same direction, and pull the flattened printed product to the open section of the lower conveying unit, and perform optical detection of the front side of the printed product through the corresponding optical detection unit (106); Step 3: The two conveying units are started synchronously and the movement directions and speeds of the two conveying units when pulling the object are consistent, so that the printed product is clamped by the overlapping sections of the two conveying units; Step 4: The driving motor (1041) is started to drive the conveying assembly (103) to rotate 180 degrees around the mounting ring (101), so that the upper and lower positions of the two conveying units are reversed, and the front and back sides of the printed products are reversed; Step 5: The two conveying units are started synchronously and the moving direction and speed of the towing object remain consistent, so that the printed product leaves the overlapping section of the conveying unit and is located on the open section of the conveying unit, and the optical detection of the back of the printed product is achieved through the corresponding optical detection unit (106).

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