Plate material detection device

Abstract

The invention discloses a plate material detection device, and relates to the technical field of plate detection devices. A plate material detection device comprises a rotary table and further comprises a plurality of N-shaped frames circumferentially installed on the rotary table. The two groups of conveying rollers are rotationally arranged on the upper layer and the lower layer of the N-shaped frame respectively; the position of the plate can be dynamically adjusted on the X axis, the Y axis and the Z axis, multiple illumination angles are achieved, the defect problems of recesses or protrusions such as scratches, pits and surface material damage and upwarp appear at different illumination angles, then identification of an industrial camera is facilitated, and the production efficiency is improved. Compared with traditional static detection, the detection accuracy can be further improved; according to the device, a dynamic detection mode is adopted, and compared with existing static detection, when some plates made of special materials are detected, moire interference in the static detection process can be eliminated, so that the dynamic plates and the annular light source are cooperatively matched, and the detection accuracy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of plate material detection devices, and in particular, relates to a plate material detection device. Background Art

[0002] In the field of industrial manufacturing, the detection of surface defects (such as scratches, pits, warping, etc.) on panels is a key link in ensuring product quality.

[0003] The existing traditional detection technology is mainly achieved through a fixed light source (such as an LED array or a laser light source) combined with industrial camera imaging. However, there are some defects in practical applications, such as single illumination and static light source illumination angle leading to shadow obstruction (such as blurred pit imaging), anisotropic defects (such as longitudinal scratches) or mirror reflection interference (such as missed detection of metal scratches), which lead to inaccurate recognition by industrial cameras and cause problems such as missed detection. Therefore, a detection device for sheet materials is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a wood detection device for furniture production that can overcome the above problems or at least partially solve the above problems.

[0005] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a plate material detection device, including a turntable, and also including: a plurality of N-type frames circumferentially installed on the turntable; two groups of conveying rollers, which are respectively rotatably arranged on the upper and lower layers of the N-type frames, and each group of the conveying rollers includes roller one, roller two, and roller three; a plurality of friction wheels respectively slidably connected to roller one, roller two, and roller three; an annular light source, which is respectively arranged on roller one, roller two, and roller three; an industrial camera, which is located above the N-type frame; a first detection area is formed between roller one and roller two, a second detection area is formed between roller two and roller three, and a third detection area is formed on one side of roller three, and when the plate passes through the first detection area, the second detection area, and the third detection area in sequence, dynamic multi-dimensional detection is performed on the surface of the plate.

[0006] In order to facilitate the resetting of the friction wheels, preferably, the multiple friction wheels respectively located on the roller one, roller two, and roller three are fixedly connected by a pull rod, and fixed rings are fixedly connected at both ends of the roller one, roller two, and roller three, and a first spring is sleeved between the fixed ring and the adjacent friction wheel.

[0007] Furthermore, the distance between the first roller and the second roller is L1, the distance between the second roller and the third roller is L2, and the distance between the first roller and the third roller is L=L1+L2.

[0008] L1=1 / 2L2.

[0009] In order to increase the contact area with the plate, preferably, connecting rods are slidably connected to the N-shaped frames below the rollers one, two and three, respectively, and the multiple connecting rods are fixedly connected by connecting arms. The connecting rods are fixedly connected with N-shaped buckles, and the N-shaped buckles are engaged on the friction wheels.

[0010] In order to facilitate the horizontal movement of the friction wheel, preferably, the bottom of the N-type frame is rotatably connected to a rotating shaft, a rotating drum is fixedly connected to the rotating shaft, a wave guide groove is opened on the outer periphery of the rotating drum, a connecting plate is fixedly connected to the connecting arm, a sliding column is fixedly connected to the connecting plate, and the sliding column is located in the wave guide groove.

[0011] Preferably, a connecting shaft is rotatably connected to the bottom of the N-shaped frame, a cam is fixedly connected to the connecting shaft, and the cam is located in the third detection area.

[0012] Preferably, the N-shaped frame is provided with a first slide groove and a second slide groove respectively, and the two ends of the second roller and the third roller located on the upper layer of the N-shaped frame are respectively located in the first slide groove and the second slide groove, and a mounting plate is connected between the second roller and the third roller, and a second spring is connected between the mounting plate and the side plate on the N-shaped frame.

[0013] Furthermore, the first roller, the second roller and the third roller are hollow, and air outlet holes are opened on the outer periphery of the first roller, the second roller and the third roller.

[0014] In order to reduce the use of electrical equipment, preferably, roller one and roller two and roller two and roller three in each group of the conveying rollers are connected by a first synchronous belt and a second synchronous belt respectively, and the roller one in the two groups of the conveying rollers are connected by gears.

[0015] In order to reduce the use of electrical equipment, preferably, the rotating roller 1 located at the lower layer of the N-type frame is connected to the rotating shaft and the connecting shaft through a third synchronous belt and a fourth synchronous belt respectively.

[0016] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention can dynamically adjust the position of the plate in the X, Y, and Z axes, and realize multiple lighting angles, so that scratches, pits, damaged and warped surface materials and other concave or convex defects are displayed under different lighting angles, which is beneficial to the recognition of industrial cameras and can further improve the detection accuracy compared with traditional static detection; and the dynamic light source adopted by the device reduces the demand for high-precision light source arrays compared with the prior art, and further reduces the cost; among them, the device adopts a dynamic detection method, compared with the existing static detection, when detecting some special materials of plates, it may also be beneficial to eliminate moiré interference during static detection. Therefore, the coordinated cooperation of the dynamic plate and the annular light source adopted by the device is beneficial to improving the detection accuracy.

[0017] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the attached picture:

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a plate material detection device proposed by the present invention;

[0020] Figure 2 A top view of a plate material detection device proposed by the present invention;

[0021] Figure 3 A side view of a plate material detection device proposed by the present invention;

[0022] Figure 4 This is a schematic structural diagram of a roller 1, a roller 2 and a roller 3 of a plate material detection device proposed by the present invention;

[0023] Figure 5 This is a schematic structural diagram of a wave guide groove and a sliding column of a plate material detection device proposed by the present invention;

[0024] Figure 6 This is a structural schematic diagram of a cam and an N-type buckle of a plate material detection device proposed by the present invention;

[0025] Figure 7 This is a structural schematic diagram of a friction wheel and a first spring of a plate material detection device proposed by the present invention;

[0026] Figure 8 A schematic structural diagram of a second chute of a plate material detection device proposed by the present invention;

[0027] Fig. 9 This is a schematic structural diagram of a connecting arm of a plate material detection device proposed by the present invention;

[0028] Fig.10 This is a structural schematic diagram of a second spring and a mounting plate of a plate material detection device proposed by the present invention.

[0029] In the figure: 1, turntable; 10, N-type frame; 11, roller 1; 110, side plate; 111, friction wheel; 112, pull rod; 113, fixing ring; 114, first spring; 115, annular light source; 116, air outlet; 117, first synchronous belt; 1171, second synchronous belt; 118, mounting plate; 119, second spring; 12, roller 2; 13, roller 3; 14, gear; 15, N-type buckle; 151. Connecting rod; 152. Connecting arm; 153. Rotating shaft; 154. Third synchronous belt; 155. Rotating drum; 156. Wave guide groove; 157. Connecting plate; 158. Sliding column; 16. Connecting shaft; 161. Cam; 162. Fourth synchronous belt; 17. First slide groove; 18. Second slide groove; 2. First detection area; 3. Second detection area; 4. Third detection area; 5. Motor; 6. Mounting table; 7. Plate. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0031] The following is combined with Figure 1 -Attached Fig.10 , describes in detail the technical solutions provided by each embodiment of the present invention.

[0032] Example 1: Reference Figure 1-Figure 10A plate material detection device includes a turntable 1 installed on a mounting table 6, and also includes: a plurality of N-shaped frames 10 installed on the turntable 1 by bolts, the N-shaped frame 10 is open at one end; two groups of conveying rollers, which are rotatably arranged on the upper and lower layers of the N-shaped frame 10, respectively, and each group of conveying rollers includes a roller 11, a roller 2 12, and a roller 3 13, and the roller 11 is rotatably arranged near the open end of the N-shaped frame 10; a plurality of friction wheels 111 respectively slidably connected to the roller 11, the roller 2 12, and the roller 3 13; an annular light source 115, which is respectively embedded in the outer circumference of the roller 11, the roller 2 12, and the roller 3 13, and specifically, the outer circumferences of the roller 11, the roller 2 12, and the roller 3 13 are respectively provided with a plurality of annular embedded grooves, and the annular light sources 115 are respectively embedded in the outer circumferences of the roller 11, the roller 2 12, and the roller 3 13. The light source 115 is embedded in the annular embedded groove, and multiple annular light sources 115 are arranged on roller 1 11, roller 2 12, and roller 3 13, which can increase the irradiation range. The annular light source 115 uses blue light. The main reason is that the light wave of blue light is shorter, easy to reflect and diverge, and easy to be observed by the industrial camera; the industrial camera is arranged above the N-type frame 10 through a bracket, and an industrial camera is arranged above each N-type frame 10; a first detection area 2 is formed between roller 1 11 and roller 2 12, a second detection area 3 is formed between roller 2 12 and roller 3 13, and a third detection area 4 is formed on one side of roller 3 13. When the plate 7 passes through the first detection area 2, the second detection area 3, and the third detection area 4 in sequence, the surface of the plate 7 is dynamically multi-dimensionally detected;

[0033] Multiple friction wheels 111 respectively located on the roller 11, the roller 2, and the roller 3, 13 are fixedly connected by a pull rod 112, and fixed rings 113 are fixedly connected at both ends of the roller 11, the roller 2, and the roller 3, 13, and a first spring 114 is sleeved between the fixed ring 113 and the adjacent friction wheel 111;

[0034] Connecting rods 151 are slidably connected to the N-shaped frame 10 below the roller 11, the roller 2, and the roller 3, 13, respectively. The multiple connecting rods 151 are fixedly connected via connecting arms 152. The connecting rods 151 are fixedly connected to an N-shaped buckle 15, which is engaged with the friction wheel 111.

[0035] The bottom of the N-shaped frame 10 is rotatably connected to a rotating shaft 153, to which a rotating drum 155 is fixedly connected. A wave guide groove 156 is provided on the outer periphery of the rotating drum 155, and a connecting plate 157 is fixedly connected to the connecting arm 152. A sliding column 158 is fixedly connected to the connecting plate 157, and the sliding column 158 is located in the wave guide groove 156.

[0036] A connecting shaft 16 is rotatably connected to the bottom of the N-shaped frame 10 , and a cam 161 is fixedly connected to the connecting shaft 16 . The cam 161 is located in the third detection area 4 .

[0037] The N-shaped frame 10 is provided with a first chute 17 and a second chute 18, respectively. The two ends of the second roller 12 and the third roller 13 located on the upper layer of the N-shaped frame 10 are located in the first chute 17 and the second chute 18, respectively. A mounting plate 118 is connected between the second roller 12 and the third roller 13, and a second spring 119 is connected between the mounting plate 118 and the side plate 110 on the N-shaped frame 10.

[0038] The roller 1 11 and roller 2 12 and the roller 2 12 and roller 3 13 in each set of conveying rollers are connected by a first synchronous belt 117 and a second synchronous belt 1171 respectively, and the roller 1 11 in the two sets of conveying rollers are connected by a gear 14.

[0039] The rotating roller 11 located at the lower layer of the N-shaped frame 10 is connected to the rotating shaft 153 and the connecting shaft 16 respectively through the third synchronous belt 154 and the fourth synchronous belt 162.

[0040] The N-shaped frame 10 is provided with a motor 5, which is connected to a roller 11 located on the upper layer of the N-shaped frame 10, and the motor 5 drives the two conveying rollers to rotate relative to each other;

[0041] When the device is in use, one end of the plate 7 is placed between two rollers 11. The friction wheels 111 on the two rollers 11 clamp the plate 7 and transport it toward the center of the turntable 1. During the transportation process, one end of the plate 7 is transported from the two rollers 11 to between the two rollers 12. During this period, the industrial camera located above continues to identify surface defects on the plate 7 passing through the first inspection area 2.

[0042] When the plate 7 passes through the first detection area 2, the conveying roller drives the rotating shaft 153 to rotate through the third synchronous belt 154, and the rotating drum 155 rotates. When the rotating drum 155 rotates, the sliding column 158 is driven to move horizontally back and forth through the wave guide groove 156, and the friction wheel 111 is dragged to slide on the roller 11, the roller 2 12, and the roller 3 13 through the N-type buckle 15. Since the plate 7 is clamped by the friction wheel 111, the friction wheel 111 will drive the plate 7 to move horizontally in the N-type frame 10 during the sliding process. Since the plate 7 is horizontally shifted relative to roller one 11, roller two 12, and roller three 13, the position between the plate 7 and the annular light source 115 on roller one 11 and roller two 12 will be constantly changed, so that the irradiation angle and position of the annular light source 115 on the plate 7 will be constantly changed. When scratches, pits, damaged and warped surface materials appear on the surface of the plate 7, or other concave or convex defects occur, the irradiation angle of the annular light source 115 on the plate 7 will change, and the reflection of the defects will also change, making it easier to be captured by the industrial camera.

[0043] Secondly, when the plate 7 is conveyed to the second roller 12, the second roller 12 cooperates with the first roller 11 to clamp the plate 7 more stably and prevent the plate 7 from slipping;

[0044] When the plate 7 reaches the second inspection area 3, the annular light sources 115 on the second roller 12 and the third roller 13 jointly irradiate the plate 7 in the second inspection area 3; wherein, the range of the second inspection area 3 is larger than that of the first inspection area 2, so the second inspection area 3 has a larger range to cover the area of ​​the plate 7, and the second inspection area 3 has a larger range to allow a more flexible incident angle of the blue light source, which can reduce the interference of mirror reflection or shadow occlusion. Secondly, the large range of the second inspection area 3 can capture long-distance linear defects, such as through scratches, and distributed defects, such as dense pitting, and cooperate with the friction wheel 111 to drive the plate 7 to move horizontally, so as to more accurately detect the surface defects of the plate 7;

[0045] Therefore, the first inspection area 2 can be used to perform a local scan on the plate 7, and the second inspection area 3 can perform a large-scale scan, which can reduce the inspection time and improve the overall efficiency;

[0046] It should be noted that, in order to reduce the interference of the annular light source 115 on the industrial camera lens, a shielding cover can be provided above the roller 1 11 , the roller 2 12 , and the roller 3 13 on the upper layer of the N-shaped frame 10 .

[0047] When one end of the plate 7 reaches the third detection zone 4 and the end of the plate 7 is separated from the roller 11, the cam 161 driven to rotate by the connecting shaft 16 will reciprocate and push the lower surface of the plate 7 from below, so that the end of the plate 7 close to the third detection zone 4 will rise reciprocatingly, and in the rising process, the roller 3 13 located on the upper layer of the N-shaped frame 10 will slide in the second slide groove 18 due to the rising of the plate 7 and squeeze the second spring 119, and at the same time, the roller 2 12 on the upper layer will adaptively move in the first slide groove 17; and in this process, the lower surface of the plate 7 is separated from the roller 3 13 located on the lower layer, but the end of the plate 7 is still located between the two rollers 2 12;

[0048] Therefore, the plate 7 will move horizontally while rising and falling at one end, which makes the plate 7 further change its position relative to the annular light source 115, thereby realizing dynamic multi-dimensional detection and improving the accuracy of detecting surface defects of the plate 7.

[0049] Furthermore, when the plate 7 is inspected in the third inspection area 4, since the plate 7 rises, hidden defects of the plate 7 when subjected to force, such as micro cracks, can also be detected.

[0050] It should be understood that the scanning and identification range of the industrial camera covers the first detection area 2 , the second detection area 3 , and the third detection area 4 .

[0051] Therefore, the setting of the present device can make the plate 7 dynamically adjust its position in the X, Y, and Z axes, realize multiple lighting angles, and make scratches, pits, surface material damage and warping, and other concave or convex defects appear under different lighting angles, which is beneficial to the recognition of industrial cameras and can further improve the detection accuracy compared with traditional static detection; and the dynamic light source used in the present device reduces the demand for high-precision light source arrays compared with the existing technology, and further reduces the cost; among them, the present device adopts a dynamic detection method, which may be beneficial to eliminate moiré interference during static detection when detecting some special material plates 7, compared with the existing static detection, so the coordinated cooperation of the dynamic plate 7 and the annular light source 115 used in the present device is beneficial to improve the detection accuracy;

[0052] At the same time, the device can further improve the detection efficiency by providing at least four workstations (at least two workstations are provided, including but not limited to four).

[0053] When one end of the plate 7 approaches the sensor located on the N-shaped frame 10 (refer to Figure 4 ), the motor 5 stops or rotates in the reverse direction (freely set according to the actual situation). When the detection is completed, the motor 5 is flipped over so that the plate 7 can be discharged from the open end of the N-shaped frame 10. If there is a need to detect the back side of the plate 7, the plate 7 can be flipped over and detected again according to the above method.

[0054] In one embodiment, in order to increase the horizontal lateral movement speed of the connecting rod 151, a speed increaser can be set on the connecting rod 151, and the third synchronous belt 154 is connected to the input end of the speed increaser, thereby increasing the horizontal lateral movement speed of the connecting rod 151 without changing the rotation speed of the conveying roller.

[0055] In another embodiment, the third synchronous belt 154 is eliminated, and a cylinder is added, one end of which is connected to the connecting rod 151 , and the connecting rod 151 is pulled by the cylinder to change the horizontal lateral speed of the connecting rod 151 .

[0056] Example 2: Reference Fig. 9 A plate material detection device is basically the same as the embodiment 1, and further, the spacing between the roller 1 11 and the roller 2 12 is L1, the spacing between the roller 2 12 and the roller 3 13 is L2, and the spacing between the roller 1 11 and the roller 3 13 is L=L1+L2,

[0057] L1=1 / 2L2;

[0058] The distance between roller one 11 and roller two 12 is smaller than the distance between roller two 12 and roller three 13, which is beneficial for the plate 7 to be quickly clamped by the two rollers two 12 after being clamped by the two rollers one 11, thereby preventing the plate 7 from slipping due to the influence of the center of gravity at the end. At the same time, the first detection area 2 can achieve the annular light source 115 on roller one 11 and roller two 12 to concentrate on the first detection area 2, thereby enhancing the recognition accuracy of the first detection area 2 and achieving the effect of local scanning of the plate 7.

[0059] Example 3: Reference Figure 8 , a plate material detection device, which is basically the same as the embodiment 2, further comprising: the first roller 11, the second roller 12, and the third roller 13 are hollow, and the outer peripheries of the first roller 11, the second roller 12, and the third roller 13 are provided with air outlet holes 116;

[0060] By providing the air outlet 116, foreign matter adhering to the surface and back of the plate 7 can be removed during the process of the rollers 11, 2, 12, and 3, 13 conveying the plate 7, thereby avoiding misdetection.

[0061] Among them, one end of the external pipeline is rotatably connected to one end of the roller 1 11, the roller 2 12, and the roller 3 13, so that the external pipeline is connected with the roller 1 11, the roller 2 12, and the roller 3 13, so as to facilitate the supply of gas to the inside thereof;

[0062] Furthermore, when the gas flows through the roller 1 11 , the roller 2 12 , and the roller 3 13 , it can also dissipate heat for the annular light source 115 .

[0063] It should be understood that the wires of the annular light source 115 are located inside roller 11, roller 2 12, and roller 3 13, and pass through the ends of roller 1 11, roller 2 12, and roller 3 13 away from the external pipeline, and are connected to the rotating connector to facilitate power supply for the annular light source 115.

[0064] The device can be used to detect various panels 7 that have smooth surfaces and can be reset after being subjected to force, such as composite panels (carbon fiber composite materials, glass fiber reinforced plastics, aramid fiber panels), functional coated panels (optical coated panels, antistatic coated panels, corrosion-resistant coated panels), and architectural decorative panels; among them, existing furniture production tends to be quality-oriented and high-end. In the furniture production process, the panels 7 not only provide structural support, but also have aesthetics. If there are defects on the surface of the panels 7, it will affect the overall aesthetics of the furniture. In furniture manufacturing companies, manual defect detection is inefficient, so the device is also particularly suitable for defect detection of spliced ​​panels 7 in the furniture production process.

[0065] According to the thickness and width of different plates 7, the spacing between the two sets of conveying rollers can be set according to the actual thickness of the plates 7, and the width and length of the N-shaped frame 10 can be set according to the actual thickness of the plates 7;

[0066] The present invention can dynamically adjust the position of the plate 7 on the X, Y, and Z axes to achieve multiple lighting angles, so that scratches, pits, damaged and warped surface materials and other concave or convex defects are displayed at different lighting angles, which is beneficial to the recognition of industrial cameras and can further improve the detection accuracy compared to traditional static detection; and the dynamic light source used in this device reduces the demand for high-precision light source arrays compared to the existing technology, further reducing costs; among them, the dynamic detection method used in this device is compared to the existing static detection. When detecting plates 7 made of some special materials, it may also be beneficial to eliminate moiré interference during static detection. Therefore, the coordinated cooperation of the dynamic plate 7 and the annular light source 115 used in this device is beneficial to improving detection accuracy.

[0067] The above 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 technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A plate material detection device, comprising a turntable (1), characterized in that: Also includes: A plurality of N-shaped frames (10) circumferentially mounted on the turntable (1); Two groups of conveying rollers are rotatably arranged on the upper and lower layers of the N-shaped frame (10), respectively, and each group of conveying rollers includes a roller 1 (11), a roller 2 (12), and a roller 3 (13); A plurality of friction wheels (111) respectively slidably connected to the first roller (11), the second roller (12), and the third roller (13); annular light sources (115), respectively arranged on the first roller (11), the second roller (12), and the third roller (13); An industrial camera, located above the N-shaped frame (10); A first detection zone (2) is formed between the first roller (11) and the second roller (12), a second detection zone (3) is formed between the second roller (12) and the third roller (13), and a third detection zone (4) is formed on one side of the third roller (13). When the plate (7) passes through the first detection zone (2), the second detection zone (3), and the third detection zone (4) in sequence, dynamic multi-dimensional detection is performed on the surface of the plate (7).

2. A plate material detection device according to claim 1, characterized in that: A plurality of friction wheels (111) respectively located on the roller one (11), the roller two (12), and the roller three (13) are fixedly connected via a pull rod (112), and a fixing ring (113) is fixedly connected at both ends of the roller one (11), the roller two (12), and the roller three (13), and a first spring (114) is sleeved between the fixing ring (113) and the adjacent friction wheel (111).

3. A plate material detection device according to claim 1, characterized in that: The distance between the first roller (11) and the second roller (12) is L1, the distance between the second roller (12) and the third roller (13) is L2, and the distance between the first roller (11) and the third roller (13) is L=L1+L2. L1 = (1 / 2) L2.

4. A plate material detection device according to claim 3, characterized in that: Connecting rods (151) are slidably connected to the N-shaped frame (10) below the first roller (11), the second roller (12) and the third roller (13), respectively; a plurality of the connecting rods (151) are fixedly connected via connecting arms (152); an N-shaped buckle (15) is fixedly connected to the connecting rod (151); and the N-shaped buckle (15) is engaged with the friction wheel (111).

5. A plate material detection device according to claim 4, characterized in that: The bottom of the N-shaped frame (10) is rotatably connected to a rotating shaft (153), a rotating drum (155) is fixedly connected to the rotating shaft (153), a wave guide groove (156) is provided on the outer periphery of the rotating drum (155), a connecting plate (157) is fixedly connected to the connecting arm (152), a sliding column (158) is fixedly connected to the connecting plate (157), and the sliding column (158) is located in the wave guide groove (156).

6. A plate material detection device according to claim 2 or 3, characterized in that: The bottom of the N-shaped frame (10) is rotatably connected to a connecting shaft (16), and a cam (161) is fixedly connected to the connecting shaft (16), and the cam (161) is located in the third detection area (4).

7. A plate material detection device according to claim 6, characterized in that: The N-shaped frame (10) is provided with a first slide groove (17) and a second slide groove (18), respectively; two ends of a second roller (12) and a third roller (13) located on an upper layer of the N-shaped frame (10) are located in the first slide groove (17) and the second slide groove (18), respectively; a mounting plate (118) is connected between the second roller (12) and the third roller (13); and a second spring (119) is connected between the mounting plate (118) and a side plate (110) on the N-shaped frame (10).

8. A plate material detection device according to claim 2 or 3, characterized in that: The first roller (11), the second roller (12) and the third roller (13) are hollow, and air outlet holes (116) are opened on the outer circumference of the first roller (11), the second roller (12) and the third roller (13).

9. A plate material detection device according to claim 7, characterized in that: The rollers 1 (11), 2 (12) and 2 (12), 3 (13) in each group of the conveying rollers are connected via a first synchronous belt (117) and a second synchronous belt (1171), respectively; the rollers 1 (11) in the two groups of the conveying rollers are connected via a gear (14).

10. A plate material detection device according to claim 9, characterized in that: The rotating roller 1 (11) located at the lower layer of the N-shaped frame (10) is connected to the rotating shaft (153) and the connecting shaft (16) respectively via a third synchronous belt (154) and a fourth synchronous belt (162).

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