A defect detection device for sandpaper production

Abstract

The application relates to the technical field of abrasive paper production, in particular to a defect detection device for abrasive paper production, which solves the defects in the prior art and comprises a conveying mechanism, a detection box and a detection mechanism. The conveying mechanism comprises a machine base, a guide mechanism and two winding rollers arranged on the machine base. A PLC controller is further arranged on the machine base. The two winding rollers are arranged to rotate in the same direction. The guide mechanism is arranged at the top edge of the machine base and is provided with two groups and is arranged on the two sides of the machine base. The detection box is arranged above the machine base. A driving piece is arranged on the inner wall of one side of the detection box in a sliding mode along the vertical direction. A gear one is arranged on one side of the driving piece in a meshing mode. A pointer handle synchronous with the gear one is connected to one side of the gear one. A sliding sleeve is arranged on the pointer handle in a sliding mode. Compared with the prior art, the application not only improves the intuitiveness of detecting the defects of the abrasive paper, but also can mark the defect position in time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sandpaper production, and particularly relates to a defect detection device for sandpaper production. BACKGROUND

[0002] Sandpaper is a kind of grinding tool necessary for mechanical processing industry, and its demand and usage amount show a trend of increasing year by year with the development of mechanical processing industry, building industry and industrial technology level. Raw materials for producing sandpaper include sand particles and adhesive tape, and the production process steps can be divided into base cloth unwinding, gluing, sand planting, re-gluing, drying and curing, and finally becoming a finished product. In this production process, sand planting is the key, that is, simply said, sand particles are evenly coated on the surface of the base paper. Therefore, the quality of the sandpaper is determined by the uniformity of the sand particles on the surface of the sandpaper to a certain extent.

[0003] However, in the production process, due to some non-standard operations and other reasons, the produced sandpaper may have defects, for example, due to the wrinkling of the base paper caused by moisture, or too large or too small tension during production, or uneven drying, etc., which may cause the formation of creases on the sandpaper, thereby affecting the normal grinding effect when using the finished sandpaper due to the convex part on the surface.

[0004] However, for a long time, the main means of sandpaper quality detection is to qualitatively analyze the surface defects of the sandpaper by workers with certain working experience through uninterrupted visual inspection. The national standard also stipulates the traditional method of detecting the appearance quality of sandpaper by visual inspection and steel ruler measurement. It can be imagined that in today's economic benefits and automation requirements are increasingly high, this traditional method is no longer applicable. The time-consuming and errors caused by the subjective factors of workers may affect the detection results. Moreover, the convex parts formed on the sandpaper are relatively small in size, which is not very convenient and intuitive to observe.

[0005] Therefore, it is necessary to provide a defect detection device for sandpaper production, which can detect the defects of the sandpaper creases and mark the defect positions. SUMMARY

[0006] The present application aims to provide a defect detection device for sandpaper production to solve the problems in the background art.

[0007] In order to solve the above technical problems, the present application provides the following technical solutions:

[0008] The utility model provides a kind of defect detection device for abrasive paper production, including conveying mechanism, detection box and detection mechanism, the conveying mechanism includes machine base, guide mechanism, and two winding rollers on machine base, PLC controller is also provided on the machine base, the winding roller of two sides is same direction rotation arrangement, guide mechanism is installed at the top edge of machine base, and it is provided with two groups and is located at the two sides of machine base respectively;

[0009] The detection box is installed above the machine base, a drive member is slidably arranged on the inner wall of the detection box in the vertical direction, a gear one is engaged on one side of the drive member, a pointer handle connected with the gear one is connected on one side of the gear one, a sliding sleeve is slidably arranged on the pointer handle, a fixed rod is further arranged between the inner walls of the detection box, a driven handle connected with the sliding sleeve is rotatably arranged on the fixed rod, the driven handle is arranged in an "L" shape and a drive handle is connected to the other end of the driven handle, and the end of the pointer handle is movably located outside the detection box.

[0010] The detection mechanism includes a detection head, a connecting block and a connecting shaft, the connecting shaft is fixed between the detection head and the connecting block, the connecting shaft penetrates through the bottom wall of the detection box, and one end of the connecting block is connected to the drive handle through a shaft, and a second spring is further sleeved on the connecting shaft.

[0011] In one embodiment, a marking mechanism is further included, the marking mechanism includes a handle sleeve, a piston cylinder and a marker, a gear two is connected to one side of the handle sleeve and rotates synchronously with the handle sleeve, the gear two is rotatably arranged on one side of the inner wall of the detection box through a shaft connection, and the gear two is also engaged with the drive member, the gear two and the gear one are arranged at an angle of 90 degrees, the piston cylinder is elastically movable in the handle sleeve, and the marker is inserted into the interior of the piston cylinder.

[0012] In one embodiment, tooth slots one and two are respectively formed on the two adjacent side walls of the drive member, the tooth slots one and two are respectively engaged with the gear one and the gear two, and the tooth slots one are located above the tooth slots two.

[0013] In one embodiment, an extension plate is installed on each side wall of the machine base, a first motor is installed on the extension plate, and a transmission mechanism is further arranged between the first motor and the winding roller located on the same side of the first motor.

[0014] The transmission mechanism includes a motorized wheel and a transmission wheel, the motorized wheel is installed on the output end of the first motor, the transmission wheel is connected with the winding roller, and a transmission track is further arranged between the motorized wheel and the transmission wheel.

[0015] In one embodiment, the winding roller comprises two outer discs and a roller shaft installed between the two outer discs, threaded parts are arranged on both ends of the roller shaft, the threaded parts are arranged in threaded connection between the outer discs, and a limiting rod is elastically arranged between the two outer discs.

[0016] In one embodiment, the guide mechanism comprises two limiting clamps, a side slot is arranged at each end of the base, a guide rod one is welded in the side slot along the length direction of the side slot, the limiting clamps slide on the guide rod one, and a spring one is arranged outside the guide rod one at one side of the limiting clamps.

[0017] In one embodiment, a supporting mechanism is further arranged below the detection box, the supporting mechanism comprises a fixing frame, a supporting leg one and a supporting leg two, the fixing frame is welded at both sides of the detection box, the bottom end of the fixing frame is fixed on the base, and a rolling brush is further arranged on the side wall of the fixing frame at one side.

[0018] In one embodiment, the supporting leg one and the supporting leg two are both arranged in two, and are respectively welded at four end portions of the bottom wall of the detection box, a limiting plate one and a limiting plate two are elastically arranged between the two supporting leg ones and the two supporting leg twos respectively.

[0019] In one embodiment, a side opening is arranged on the side wall of the detection box, one end of the pointer handle, the driven handle and the sliding sleeve is movably arranged in and out of the side opening.

[0020] In one embodiment, when the detection head moves upward, the pointer handle and the gear one synchronously rotate in the clockwise direction of the plane where the gear one is arranged, and the gear two and the marking mechanism also synchronously rotate in the clockwise direction of the plane where the gear two is arranged.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. The detection mechanism is arranged, the driving handle, the driven handle, the gear one and the pointer handle are arranged in the detection box, the movement of the detection mechanism is driven upward after touching the protruding part on the sandpaper, the slight lifting effect can be more obviously found by the staff through the amplitude swing of the pointer handle, and the intuitiveness of detection is improved.

[0023] 2. The marking mechanism is arranged, the gear two and the driving part are arranged in the detection box, the lifting process of the detection mechanism is driven, the gear two can synchronously drive the marking mechanism to rotate and adjust, and the elastic arrangement of the marking mechanism can make the marker pen mark near the protruding part on the sandpaper.

[0024] 3. The sandpaper winding device has the advantages that the limiting rod is arranged on the winding roller, limiting clamps are arranged on both sides of the machine base, the sandpaper is guided by the limiting clamps, the elasticity of the limiting rod is utilized to ensure the tightness of the outer sandpaper of the sandpaper cylinder on the winding roller, and the limiting pressure plates one and two are arranged on the lower sides of the detection box, so that the tail of the sandpaper is prevented from swinging when passing through the detection position and affecting the detection. BRIEF DESCRIPTION OF DRAWINGS

[0025] The technical scheme and other beneficial effects of the present application will be apparent through the following detailed description of the specific embodiments of the present application in combination with the drawings.

[0026] In the drawings:

[0027] Figure 1 is a schematic diagram of the overall structure of the present application;

[0028] Figure 2 is a schematic diagram of the front view structure of Figure 1

[0029] Figure 3 is a schematic diagram of the guiding mechanism of the present application;

[0030] Figure 4 is a schematic diagram of the installation of the roller shaft and the limiting rod of the winding roller of the present application;

[0031] Figure 5 is a schematic diagram of the inside of the detection box of the present application;

[0032] Figure 6 is a schematic diagram of the top view structure of Figure 5

[0033] Figure 7 is a schematic diagram of the driving between the detection mechanism and the marking mechanism of the present application;

[0034] Figure 8 is a schematic diagram of the installation of the limiting pressure plate two of the present application;

[0035] Figure 9 is a schematic diagram of the structure of the limiting pressure plate two, the vertical shaft and the protruding block two of the present application.

[0036] ​​In the figure: 1, base; 11, PLC controller; 12, epitaxial plate; 13, limiting clamp; 131, guide rod one; 132, spring one; 2, winding roller; 21, motor one; 22, transmission mechanism; 221, motorized wheel; 222, transmission wheel; 23, limiting rod; 24, groove; 25, guide rod two; 26, roller shaft; 261, threaded part; 3, detection box; 31, side opening; 32, fixed rod; 33, gear one; 331, pointer handle; 34, driving piece; 341, tooth groove one; 342, tooth groove two; 343, guide block; 35, gear two; 36, driving handle; 37, driven handle; 371, sliding sleeve; 38, fixed frame; 381, rolling brush; 39, vertical groove; 4, support leg one; 41, pressure limiting plate one; 5, support leg two; 51, pressure limiting plate two; 6, marking mechanism; 61, handle sleeve; 62, piston cylinder; 7, detection mechanism; 71, detection head; 72, connecting block; 73, spring two; 8, vertical shaft; 81, spring three. DETAILED DESCRIPTION

[0037] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the elements of the particular examples in the following description are described and illustrated as they are typically implemented. Of course, these are merely examples and are presented to illustrate the application and not as a limitation of the application. In addition, the present application can repeat reference numerals and / or reference letters in different examples and this repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or uses discussed. Further, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will appreciate that other processes and / or materials can be used.

[0038] See Figures 1-9The present invention provides a technical solution: a defect detection device for sandpaper production, comprising a conveying mechanism, a detection box 3 and a detection mechanism 7. The conveying mechanism comprises a machine base 1, a guide mechanism, and two winding rollers 2 located on both sides of the machine base 1. A PLC controller 11 is installed on one side wall of the machine base 1 by screws, and an integral extension plate 12 is welded to the side walls of both ends thereof. A motor 21 is installed on one side of the extension plate 12. The driving directions of the motors 21 on both sides are consistent. The motor 21 is used to output to the transmission mechanism 22. The transmission mechanism 22 comprises a motorized wheel 221 and a transmission wheel 222. The motorized wheel 221 is installed on the output end of the motor 21, and a transmission crawler is also installed between the motorized wheel 221 and the transmission wheel 222. , so that the two of them move synchronously, a mounting seat is installed on the side wall of the machine base 1 above the extension plate 12 through a fixing bolt, and the winding roller 2 is installed in the middle of the mounting seat. The winding roller 2 includes two outer discs and a roller shaft 26 located in the middle (the roller shaft 26 is detachable, and a sleeve-shaped threaded portion 261 is sleeved on both ends of the roller shaft 26. The threaded portion 261 is fixed in the outer disc by a threaded connection. The roller shaft 26 can be disassembled by rotating the threaded portion 261, wherein the length of the roller shaft 26 is equal to the distance between the two outer discs). One of the outer discs is connected to the transmission wheel 222. A groove 24 is provided on each of the two outer discs. A guide rod 25 arranged along its length direction is welded in the middle of the groove 24. A slider is elastically slid on the guide rod 25 ( Figure 4 (not shown), a limit rod 23 is welded between the two sliders, the roller 26 is removed and the sandpaper tube is installed, and then the roller 26 is installed back between the outer discs so that the limit rod 23 can press against the outer surface of the sandpaper tube to ensure that the outer layer of sandpaper on the sandpaper tube does not become loose;

[0039] Specifically, the PLC controller 11 starts the motor 21, the motor 21 drives the motor wheel 221 to rotate, the motor wheel 221 drives the transmission wheel 222 to rotate through the transmission track, thereby driving the sandpaper tube on the winding roller 2 to rotate. Figure 1 For example, the sandpaper on the right sandpaper tube is fed out, and the left sandpaper tube rewinds the sandpaper fed out from the right side.

[0040] A guide mechanism is provided at both ends of the base 1. The guide mechanism includes two limit clamps 13. A side groove is provided at both ends of the base 1. A guide rod 131 is welded inside the side groove along its length. Two limit clamps 13 are provided on the guide rod 131. A spring 132 is provided on one side of the limit clamp 13 on the outside of the guide rod 131. The sandpaper passes between the two limit clamps 13. The elastic action of the spring 132 allows the limit clamps 13 on both sides to bounce to the edge of the sandpaper, thereby guiding the sandpaper during transportation.

[0041] The detection box 3 is installed above the base 1, the top of the detection box 3 is open, the bottom side of the detection box 3 is also open, a vertical groove 39 is formed on the inner wall of one side of the detection box 3 in the vertical direction, a driving piece 34 is arranged on one side of the vertical groove 39, the driving piece 34 is in the shape of a long strip, a guide block 343 is welded on the side wall of the driving piece 34 facing the vertical groove 39, the guide block 343 is slidingly arranged on the inner wall of the vertical groove 39, so as to limit and guide the movement direction of the driving piece 34, meanwhile, a tooth groove one 341 and a tooth groove two 342 are respectively formed on the other two side walls of the driving piece 34, the tooth groove one 341 is located above the position of the tooth groove two 342, but the tooth groove one 341 and the tooth groove two 342 are arranged adjacent to each other, a gear one 33 is installed in the detection box 3, the gear one 33 is rotatably arranged on the inner wall of the detection box 3 through a shaft, the gear one 33 is engaged with the tooth groove one 341, a pointer handle 331 is fixedly installed on the other side surface of the gear one 33 through a shaft, a side opening 31 is formed on the side wall of the detection box 3, the pointer handle 331 is movably arranged in the side opening 31;

[0042] A fixed rod 32 is installed in the detection box 3 and arranged along the length direction of the detection box 3, the position of the fixed rod 32 does not affect the position of the gear one 33, a driven handle 37 is arranged on the fixed rod 32, the driven handle 37 is arranged in the shape of "L", a sliding sleeve 371 is installed on one end of the driven handle 37 through a shaft, the sliding sleeve 371 is slidingly arranged on the outer wall of the pointer handle 331, so as to drive the pointer handle 331 to rotate, so that the gear one 33 is synchronously rotated and adjusted, and the driven handle 37 and the sliding sleeve 371 can be moved out of the side opening 31 during the sliding process, one end of the driven handle 37 is connected with one end of the driving handle 36 through a shaft;

[0043] A gear two 35 is also rotatably installed on the inner wall of one side of the detection box 3 through a shaft, the gear two 35 is located on the same side as the vertical groove 39, and the gear two 35 is engaged with the tooth groove two 342;

[0044] A marking mechanism 6 is arranged on one side of the gear two 35, the marking mechanism 6 comprises a handle sleeve 61, a piston cylinder 62 and a marker, the handle sleeve 61 is installed on the side wall of one side of the gear two 35 through a fixed shaft, so that the handle sleeve 61 and the gear two 35 can be synchronously rotated, the marker is inserted into the piston cylinder 62, the piston cylinder 62 is movably arranged in the handle sleeve 61 through elastic movement (i.e. a built-in spring is arranged in the handle sleeve 61, not shown in the figure), the marker is initially in an inclined state (the inclination angle of the marker can be adjusted by adjusting the inclination angle of the handle sleeve 61); Figure 7

[0045] ​A detection mechanism 7 is provided below the detection box 3. The detection mechanism 7 includes a detection head 71, a connecting block 72, and a connecting shaft. The detection head 71 is made of rubber. The connecting shaft is welded between the detection head 71 and the connecting block 72. A second spring 73 is sleeved on the connecting shaft. The bottom end of the second spring 73 contacts the top surface of the detection head 71, and the top end of the second spring 73 contacts the bottom wall of the detection box 3. The other end of the driving handle 36 is connected to the connecting block 72 via a shaft.

[0046] Specifically, Figure 7 As shown in the example, when the detection head 71 is pushed upward by the raised part on the sandpaper, the connecting block 72 drives the driving handle 36 to move upward, so that the end of the driven handle 37 connected to the driving handle 36 also moves upward, which in turn causes the other end of the driven handle 37 to rotate downward, and then drives the sliding sleeve 371 to synchronously drive the pointer handle 331 to move downward, and the movement state of the pointer handle 331 is consistent with that of gear 1 33. When the pointer handle 331 rotates downward, gear 1 33 rotates clockwise, so that the driving member 34 moves upward under the action of tooth groove 1 341, and then through the action of tooth groove 2 342, gear 2 35 rotates counterclockwise, and then the handle sleeve 61 rotates counterclockwise, and the marker rotates downward and passes near the defect on the sandpaper to leave a mark as a mark; when the raised part moves past, the detection head 71 is reset, and the marker is also reset to the tilted state.

[0047] A supporting mechanism is also provided at the bottom of the detection box 3, which includes a fixing frame 38, a supporting foot 1 4 and a supporting foot 2 5. Two supporting feet 1 4 and two supporting feet 2 5 are provided, and are respectively welded at the four ends on the bottom wall of the detection box 3, and a fixing groove is provided on one side wall of the supporting foot 1 4 and the supporting foot 2 5. A vertical shaft 8 is welded in the fixing groove, and a spring 3 81 is sleeved on the vertical shaft 8. A limiting pressure plate 1 41 is provided between the two supporting feet 1 4, and a limiting pressure plate 2 51 is provided between the two supporting feet 2 5. A bump 1 and a bump 2 are respectively welded on the two ends of the pressure limiting plate 1 41 and the pressure limiting plate 2 51, and the bump 1 and the bump 2 elastically slide on the corresponding vertical shaft 8 respectively.

[0048] Specifically, the elastic setting of the first and second pressure limiting plates 41 and 51 can ensure the stability of the sandpaper during the detection process, especially, it can avoid the problem that the end of the sandpaper swings due to lack of restriction, thereby affecting the detection.

[0049] A fixing frame 38 is welded to the outside of both sides of the detection box 3. The bottom end of the fixing frame 38 is fixed to the machine base 1 by bolts. A bracket is installed on one side wall of the fixing frame 38 by screws. A roller brush 381 is installed between the brackets on both sides for cleaning impurities, dust, etc. on the sandpaper.

[0050] Working principle: in the production process of sandpaper, due to the original paper is wrinkled due to damp, or the tension is too large or too small during production, or uneven drying, etc., will cause the sandpaper to form a fold phenomenon; Or because the paper has a nodule, abrasive agglomeration or too thick bottom glue, etc., will cause the sandpaper to form sand group phenomenon, both will cause the use of finished sandpaper, because its surface will have a convex part, thus affecting the normal grinding effect;

[0051] Firstly, the conveying process of sandpaper is realized by two winding rollers 2, and the conveying position of sandpaper is limited by the limiting clamps 13 on both sides of the machine base 1 during the conveying process, so that the deviation is prevented. The two motors 21 rotate in the same direction, so that the sandpaper on the right sandpaper cylinder is conveyed from the right side to the left side and wound on the left sandpaper cylinder. It should be noted that the conveying process is carried out with the back of the sandpaper (i.e. the side without sand) facing up.

[0052] With the continuous conveying of sandpaper, under normal circumstances, the back of the sandpaper is flat, and the position of the detection head 71 does not change. When the convex part of the sandpaper passes through the detection head 71, the detection head 71 will be lifted up, thereby driving the linkage of the driving handle 36 and the driven handle 37, and promoting the downward deflection of the pointer handle 331. Then, through the cooperation between gear one 33, driving part 34 and gear two 35, the pointer handle 331 can be controlled to make marks near the convex part of the sandpaper while deflecting downward, so as to avoid forgetting the defect position in the subsequent process.

[0053] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or the communication or interaction relationship between two elements. For those skilled in the art, the meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] The above describes in detail a defect detection device for sandpaper production provided by the embodiment of the present application. In this paper, specific examples are applied to explain the principle and implementation mode of the present application. The above embodiment is only used to help understand the technical scheme and core idea of the present application; those skilled in the art should understand that the technical scheme recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not change the essence of the corresponding technical scheme out of the scope of the technical scheme of the embodiments of the present application.

Claims

1. A defect detection device for sandpaper production, characterized by, Include: Conveying mechanism, the conveying mechanism includes base (1), guide mechanism, and two winding rollers (2) on the base (1), the base (1) is also provided with PLC controller (11), the winding roller (2) of both sides is provided with same direction rotation, guide mechanism is installed at the top edge of base (1), and it is provided with two groups and is located at the both sides of base (1) respectively; Detection box (3), the detection box (3) is installed above the base (1), the inner wall of the one side of the detection box (3) is provided with drive part (34) along vertical direction sliding, the one side of the drive part (34) is engaged with gear one (33), the one side of the gear one (33) is connected with pointer handle (331) synchronous, the pointer handle (331) is provided with sliding sleeve (371) sliding, between the inner wall of the detection box (3) is also provided with a fixed rod (32), the fixed rod (32) is provided with driven handle (37) connected with the sliding sleeve (371) rotation, the driven handle (37) is provided with " L ” type structure and its other end is connected with drive handle (36), the end of the pointer handle (331) is located outside the detection box (3); Detection mechanism (7), the detection mechanism (7) includes detection head (71), connecting block (72) and connecting shaft, the connecting shaft is fixed between the detection head (71) and the connecting block (72), and the connecting shaft is provided through the bottom wall of the detection box (3), and the connecting block (72) and the one end of the drive handle (36) are provided through shaft connection, the connecting shaft is also provided with spring two (73); Marking mechanism (6) includes handle sleeve (61), piston cylinder (62) and marker pen, the one side of the handle sleeve (61) is connected with gear two (35) synchronous rotation, the gear two (35) is provided on the one side inner wall of the detection box (3) through shaft connection rotation, and the gear two (35) and the drive part (34) are also engaged, the gear two (35) and the gear one (33) are provided with 90 degrees, the piston cylinder (62) is elastically active in the handle sleeve (61), and the marker pen is inserted in the inside of the piston cylinder (62); The both sides of the drive part (34) are provided with gear slot one (341) and gear slot two (342) on the adjacent side wall, the gear slot one (341) and the gear one (33) are engaged with each other, the gear slot two (342) and the gear two (35) are engaged with each other, and the position of the gear slot one (341) is above the gear slot two (342); The both sides of the base (1) are provided with outer extension plate (12), the motor one (21) is installed on the outer extension plate (12), the transmission mechanism (22) is further provided between the motor one (21) and the winding roller (2) on the same side. The transmission mechanism (22) comprises a motor wheel (221) and a transmission wheel (222), the motor wheel (221) is installed on the output end of the motor (21), the transmission wheel (222) is arranged in connection with the winding roller (2), and the motor wheel (221) and the transmission wheel (222) are further provided with a transmission track.

2. The defect detection apparatus for sand paper production according to claim 1, wherein The winding roller (2) comprises two outer discs and a roller shaft (26) installed between the two outer discs, threaded parts (261) are arranged on both ends of the roller shaft (26), the threaded parts (261) are arranged in threaded connection with the outer discs, and a limiting rod (23) is further elastically arranged between the two outer discs.

3. The defect detection apparatus for sand paper production according to claim 2, wherein The guide mechanism comprises two limiting clamps (13), the two ends of the base (1) are provided with edge grooves, the edge grooves are welded with guide rods (131) arranged along the length direction of the edge grooves, the limiting clamps (13) are slid on the guide rods (131), and one side of the limiting clamps (13) is further provided with a spring (132) outside the guide rods (131).

4. The defect detection apparatus for sand paper production according to claim 3, wherein The lower side of the detection box (3) is further provided with a supporting mechanism, the supporting mechanism comprises a fixed frame (38), a supporting leg one (4) and a supporting leg two (5), the two sides of the detection box (3) are welded with the fixed frames (38), the bottom end of the fixed frame (38) is fixed on the base (1), and the sidewall of one side of the fixed frame (38) is further provided with a rolling brush (381).

5. The defect detection apparatus for sand paper production according to claim 4, wherein The supporting leg one (4) and the supporting leg two (5) are both provided with two, and are respectively welded on the four end portions of the bottom wall of the detection box (3), a limiting plate (41) is elastically arranged between the two oppositely arranged supporting leg ones (4), and a limiting plate two (51) is elastically arranged between the two oppositely arranged supporting leg twos (5).

6. The defect detection apparatus for sand paper production according to claim 5, wherein The sidewall of the detection box (3) is provided with a side opening (31), one end of the pointer handle (331), the driven handle (37) and the sliding sleeve (371) connected with the side opening (31) can be movably arranged inside and outside the side opening (31).

7. The defect detection apparatus for sand paper production according to claim 6, wherein When the detection head (71) moves upward, the pointer handle (331) and the gear one (33) are synchronously rotated in the clockwise direction of the plane where the gear one (33) is arranged, at the same time, the gear two (35) and the marking mechanism (6) are also synchronously rotated in the clockwise direction of the plane where the gear two (35) is arranged.

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