A method and control device for detecting bow degree of aramid paper

Abstract

The present invention discloses a method and control device for detecting the bow shape of aramid paper, which specifically relates to the detection field, including a support table, a mounting groove is provided on one side of the support table, a top plate is supported and installed on the top of the support table, two pillars are installed on the bottom end of one side of the top plate, a storage table is supported and installed between the two pillars and the support table, a moving mechanism is installed on both sides of the storage table, an adjusting mechanism is installed on the moving mechanism, a pressing mechanism is arranged in the mounting groove, the bottom of the pressing mechanism is supported by the mounting groove, and the other end is pressed on one side of the storage table, a maintenance groove is provided on the top of the top plate, a detection mechanism is installed in the maintenance groove, and the detection mechanism is located at the top of the middle part of the storage table. The present invention has the advantages of being able to lay the aramid paper flat, empty the air at the bottom, and fix one end, detecting and automatically calculating the bow shape of the aramid paper, high working efficiency, and strong practicality.

Description

Technical Field

[0001] The present invention relates to the field of detection technology, and more specifically, to a method and a control device for detecting the bow degree of aramid paper. Background Art

[0002] Meta-aramid paper can also be processed into aramid honeycomb through gluing, laminating, hot pressing, stretching, dipping, shaping, and slicing, and used as sandwich composite materials for high-speed trains, large aircraft, etc. The outstanding features of this aramid honeycomb material are light weight and high strength, which are reflected in: Lightweight: lighter than aluminum honeycomb; Excellent processability: not easy to scratch the surface, not easy to deform with a large span, less waste; Excellent flame retardancy: the limiting oxygen index is greater than 29, which is called "fireproof fiber"; Excellent corrosion resistance: not easy to be corroded by water vapor that penetrates the inner surface.

[0003] However, the existing aramid paper honeycomb manufacturing process is complicated, and the stability of its product quality directly affects the performance of composite material components. Therefore, the quality control of the aramid paper honeycomb manufacturing process, especially the control of quality stability, is particularly important. In the lamination process, higher requirements are put forward for the flatness of aramid paper, but there is no corresponding testing method at present. Therefore, a method and control device for detecting the bow of aramid paper are proposed. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a method and a control device for detecting the bow of aramid paper. The bow is measured on a flat paper sample. The definition of the bow is to measure the distance between the paper edge and the rope at the midpoint of a sample of a specified length, thereby detecting whether the cut paper is in the same straight line, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an aramid paper bow detection and control device, comprising a support platform, a mounting groove is provided on one side of the support platform, a top plate is supported and installed on the top of the support platform, two pillars are installed on the bottom of one side of the top plate, and a storage platform is supported and installed between the two pillars and the support platform;

[0006] Moving mechanisms are installed on both sides of the storage table, and adjusting mechanisms are installed on the moving mechanisms;

[0007] A pressing mechanism is arranged in the installation groove, the bottom of the pressing mechanism is supported by the installation groove, and the other end is pressed on one side of the storage table;

[0008] A maintenance groove is arranged at the top of the top plate, a detection mechanism is installed in the maintenance groove, and the detection mechanism is located at the top of the middle part of the storage table.

[0009] In a preferred embodiment, the moving mechanism comprises a first motor, and the first motor is fixedly installed in the installation slot;

[0010] A first coupling, one side of which is fixedly connected to the first motor;

[0011] A first screw, one end of which is fixedly connected to the other side of the first coupling;

[0012] A first slider, wherein the first slider is spirally sleeved on the first screw rod;

[0013] Two first guide rods, each of which is arranged on both sides of the first screw rod and is respectively slidably inserted on both sides of the first sliding block, and both ends of which are respectively fixed on the support platform and the pillar;

[0014] A first bearing seat, one side of which is connected to the other end of the first screw rod and the other side of which is fixedly mounted on the support column;

[0015] A support plate is welded to one side of the first sliding block.

[0016] In a preferred embodiment, the adjustment mechanism comprises a lifting rod, the top end of which is fixedly mounted on the support plate;

[0017] A brush, one side of which is fixedly connected to the bottom end of the lifting rod;

[0018] Two connecting blocks are welded on both sides of the brush and fixedly connected with the bottom end of the lifting rod.

[0019] In a preferred embodiment, the pressing mechanism includes two hydraulic rods, each of which is fixedly arranged on both sides of the installation groove;

[0020] A slide plate, one end of which is fixedly mounted on the top of the hydraulic rod and is perpendicular to the hydraulic rod;

[0021] The pressing plate has two ends which are welded to the slide plates at both sides and are perpendicular to the slide plates.

[0022] In a preferred embodiment, the detection mechanism includes a second motor, and the second motor is installed on one side of the maintenance slot at the top of the support platform;

[0023] A second coupling, one side of which is fixedly connected to the second motor;

[0024] A second screw, one end of which is connected to the other side of the second coupling;

[0025] A second slider, wherein the second slider is spirally sleeved on the second screw rod;

[0026] Two second guide rods, each of which is arranged on both sides of the second screw rod and is slidably inserted on both sides of the second sliding block;

[0027] A second bearing seat, wherein one side of the second bearing seat is connected to the other end of the second screw rod, and the other side is fixedly connected to the inner wall of the maintenance groove;

[0028] CCD, the CCD is installed in the middle of the bottom end of the second slider;

[0029] A laser emitter is installed on one side of the CCD and is located on the center line of the second slider.

[0030] In a preferred embodiment, two slide grooves are provided on the support platform on one side of the installation groove, a slide plate is inserted into each of the slide grooves, and the bottom of the slide groove is flush with the top of the storage table.

[0031] In a preferred embodiment, a scale is provided in the middle of the storage table, the scale has a measuring range of 10M, and the scale starts at the connection between the support table and the storage table, and the marking on the scale is yellow.

[0032] In a preferred embodiment, the center of the CCD photographed on the storage table is the same point as the emission end point of the laser transmitter, and the CCD is connected to a controller, and the CCD recognition color is the same as the color of the aramid paper.

[0033] A bow detection method using a control device for detecting the bow of aramid paper, the specific steps of use are as follows:

[0034] S1: First, lay a 10M wide aramid paper flat on the storage table, and connect one inner end to the inner wall of the support table;

[0035] S2: After the aramid paper is laid flat on the storage table, the pressing mechanism arranged in the installation groove is operated to press and fix the edge of the aramid paper;

[0036] S3: After the edge of the aramid paper is set, the adjusting mechanism operates to adjust the height of the brush so that the brush is pressed against the aramid paper;

[0037] S4: After the brush is pressed onto the aramid paper, the moving mechanisms on both sides operate, so that the brush moves from one end of the aramid paper to the other end, and the air between the aramid paper and the storage table is discharged, so that the aramid paper is attached to the storage table;

[0038] S5: After the aramid paper is attached to the storage table, the detection mechanism at the top is operated, and the CCD moves one end of the aramid paper to the other end to identify the length. When the CCD moves to the junction of the aramid paper and the scale at the other end, the laser emitted by the laser transmitter just irradiates the junction, and the CCD takes pictures for evidence collection;

[0039] S6: The controller automatically processes the information of the photos taken by the CCD, calculates the length of the aramid paper, and then feeds back the bow degree of the aramid paper according to the formula.

[0040] Technical effects and advantages of the present invention:

[0041] Compared with the prior art, by providing the slide grooves on the pressing mechanism, the storage table and the support table, one end of the aramid paper laid flat on the storage table can be fixed. When the pressing mechanism is operated, the slide plate on the pressing mechanism slides in the slide groove, so that the pressing plate fixes one end of the aramid paper on the storage table, which is convenient for subsequent air exhaustion and prevents loosening during detection.

[0042] Through the arrangement of the moving mechanism and the adjusting mechanism, compared with the prior art, the adjusting mechanism can adjust the height of the brush, so that the brush can be pressed on the aramid paper, and then the moving mechanism cooperates to make the brush sweep from one end of the aramid paper on the storage table to the other end, so that the air between the aramid paper and the storage table is emptied, and the aramid paper is attached to the storage table, so that during the detection, the length measurement of the aramid paper is more accurate, and the bow degree data is more accurate;

[0043] Through the detection mechanism and the setting of a scale in the middle of the storage table, compared with the prior art, the CCD on the detection mechanism can automatically identify the aramid paper. During the operation of the detection mechanism, the CCD scans the middle of the aramid paper. When scanning the junction of the aramid paper and the scale, the CCD automatically feeds back a signal to the second motor in the detection mechanism to stop running, and takes a picture of the indication on the scale, and then processes the information to calculate the bow degree of the aramid paper, thereby improving the detection efficiency of the bow degree of the aramid paper and the accuracy of the aramid paper detection. The invention is easy to use and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0045] Figure 2 It is a schematic diagram of the side planar structure of the present invention.

[0046] Figure 3 It is a rear view planar structure schematic diagram of the present invention.

[0047] Figure 4 It is a schematic diagram of the top plan structure of the present invention.

[0048] Figure 5 It is a schematic diagram of the top-cut structure of the present invention.

[0049] Figure 6 It is a structural schematic diagram of the pressing mechanism of the present invention.

[0050] Figure 7It is a schematic diagram of the connection structure of the moving mechanism and the adjusting mechanism of the present invention.

[0051] Figure 8 It is a schematic diagram of the three-dimensional structure of the detection mechanism of the present invention.

[0052] Fig. 9 It is a schematic diagram of the top plan structure of the detection mechanism of the present invention.

[0053] The accompanying drawings are marked as follows: 1. support platform; 2. mounting groove; 3. top plate; 4. pillar; 5. storage platform; 6. moving mechanism; 601. first motor; 602. first coupling; 603. first screw; 604. first slider; 605. first guide rod; 606. first bearing seat; 607. support plate; 7. adjustment mechanism; 701. lifting rod; 702. brush; 703. connecting block; 8. maintenance groove; 9. pressing mechanism; 901. hydraulic rod; 902. slide plate; 903. pressing plate; 10. detection mechanism; 1001. second motor; 1002. second coupling; 1003. second screw; 1004. second slider; 1005. second guide rod; 1006. second bearing seat; 1007. CCD; 1008. laser emitter. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] As attached Figure 1-9 The aramid paper bow detection and control device shown in the figure comprises a support platform 1, a mounting groove 2 is provided on one side of the support platform 1, a top plate 3 is supported and installed on the top of the support platform 1, two pillars 4 are installed on the bottom end of one side of the top plate 3, and a storage platform 5 is supported and installed between the two pillars 4 and the support platform 1;

[0056] The two sides of the storage platform 5 are equipped with moving mechanisms 6, and the moving mechanisms 6 are equipped with adjusting mechanisms 7;

[0057] A pressing mechanism 9 is provided in the installation groove 2, the bottom of the pressing mechanism 9 is supported by the installation groove 2, and the other end is pressed on one side of the storage table 5;

[0058] A maintenance slot 8 is provided at the top end of the top plate 3 , and a detection mechanism 10 is installed in the maintenance slot 8 . The detection mechanism 10 is located at the top end of the middle part of the storage platform 5 .

[0059] As attached Figure 1 , Figure 2, Figure 5 and Figure 7 As shown, the moving mechanism 6 includes a first motor 601, and the first motor 601 is fixedly installed in the installation slot 2;

[0060] A first coupling 602, one side of which is fixedly connected to the first motor 601;

[0061] A first screw 603, one end of which is fixedly connected to the other side of the first coupling 602;

[0062] A first slider 604, wherein the first slider 604 is spirally sleeved on the first screw rod 603;

[0063] Two first guide rods 605, each of which is disposed on both sides of the first screw rod 603, and is respectively slidably inserted on both sides of the first slider 604, and both ends are respectively fixed on the support platform 1 and the pillar 4;

[0064] A first bearing seat 606, one side of which is connected to the other end of the first screw rod 603, and the other side of which is fixedly mounted on the support column 4;

[0065] The support plate 607 is welded to one side of the first sliding block 604 .

[0066] As attached Figure 1 , Figure 5 and Figure 7 As shown, the adjustment mechanism 7 includes a lifting rod 701, and the top end of the lifting rod 701 is fixedly mounted on the support plate 607;

[0067] A brush 702, one side of which is fixedly connected to the bottom end of the lifting rod 701;

[0068] Two connecting blocks 703 , each of which is welded on both sides of the brush 702 and fixedly connected to the bottom end of the lifting rod 701 .

[0069] As attached Figure 1 , Figure 2 and Figure 6 As shown, the pressing mechanism 9 includes two hydraulic rods 901, and each of the hydraulic rods 901 is fixedly arranged on both sides of the installation groove 2;

[0070] A slide plate 902, one end of which is fixedly mounted on the top of the hydraulic rod 901 and is perpendicular to the hydraulic rod 901;

[0071] The pressing plate 903 has two ends which are welded to the slide plates 902 on both sides and are perpendicular to the slide plates 902 .

[0072] As attached Figure 1 , Figure 3 , Figure 4 , Figure 8 and Fig. 9 As shown, the detection mechanism 10 includes a second motor 1001, and the second motor 1001 is installed on one side of the maintenance slot 8 at the top of the support platform 1;

[0073] A second coupling 1002, one side of which is fixedly connected to the second motor 1001;

[0074] A second screw 1003, one end of which is connected to the other side of the second coupling 1002;

[0075] A second slider 1004, wherein the second slider 1004 is spirally sleeved on the second screw rod 1003;

[0076] Two second guide rods 1005, each of which is disposed on both sides of the second screw rod 1003 and is slidably inserted on both sides of the second sliding block 1004;

[0077] A second bearing seat 1006, wherein one side of the second bearing seat 1006 is connected to the other end of the second screw rod 1003, and the other side is fixedly connected to the inner wall of the maintenance groove 8;

[0078] CCD1007, the CCD1007 is installed in the middle of the bottom end of the second slider 1004;

[0079] The laser emitter 1008 is installed on one side of the CCD 1007 and is located on the center line of the second slider 1004 .

[0080] As attached Figure 1 and Figure 5 As shown, two slide grooves are provided on the support platform 1 on one side of the installation groove 2 , a slide plate 902 is inserted into each of the slide grooves, and the bottom of the slide groove is flush with the top of the storage platform 5 .

[0081] As attached Figure 1 and Figure 5 As shown, a scale is provided in the middle of the storage platform 5, the measuring range of the scale is 10M, and the scale starts from the connection between the support platform 1 and the storage platform 5, and the marking on the scale is yellow.

[0082] As attached Figure 2 and Figure 5 As shown, the center of the image captured by CCD1007 on the storage table 5 is the same as the emission end point of the laser emitter 1008, and CCD1007 is connected to a controller. The color recognized by CCD1007 is the same as the color of the aramid paper.

[0083] A bow detection method using a control device for detecting the bow of aramid paper, the specific steps of use are as follows:

[0084] S1: First, lay a 10M wide aramid paper flat on the storage platform 5, and connect one inner end with the inner wall of the support platform 1;

[0085] S2: After the aramid paper is laid flat on the storage table 5, the pressing mechanism 9 provided in the installation slot 2 is operated to press and fix the edge of the aramid paper;

[0086] S3: After the edge of the aramid paper is set, the adjusting mechanism 7 operates to adjust the height of the brush 702 so that the brush 702 is pressed against the aramid paper;

[0087] S4: After the brush 702 is pressed against the aramid paper, the moving mechanisms 6 on both sides operate, so that the brush 702 moves from one end of the aramid paper to the other end, and the air between the aramid paper and the placement table 5 is discharged, so that the aramid paper is attached to the placement table 5;

[0088] S5: After the aramid paper is attached to the storage table 5, the detection mechanism 10 at the top is operated, and the CCD1007 moves one end of the aramid paper to the other end to identify the length. When the CCD1007 moves to the junction of the aramid paper and the scale at the other end, the laser emitted by the laser transmitter 1008 just irradiates the junction, and the CCD1007 takes pictures for evidence collection;

[0089] S6: The controller automatically processes the information of the photos taken by CCD1007, calculates the length of the aramid paper, and then feeds back the bow degree of the aramid paper according to the formula.

[0090] Working principle of the present invention: When working, first, a 10M long aramid paper is laid flat on the storage table 5 and aligned with the support table 1, and then the pressing mechanism 9 fixes one end of the aramid paper. Specifically, the hydraulic rods 901 at both ends are contracted, so that the slide plate 902 moves down in the slide groove, so that the pressing plate 903 is pressed on the top of the aramid paper, and one end of the aramid paper is fixed on the storage table 5;

[0091] After one end of the aramid paper is fixed, the adjustment mechanism 7 adjusts the height of the brush 702, and the lifting rod 701 is extended, so that the connecting blocks 703 at both ends of the brush 702 move downward, so that the brush 702 is pressed against the aramid paper;

[0092] After the brush 702 is pressed onto the aramid paper, the moving mechanism 6 operates, dragging the brush 702 from one end of the aramid paper to the other end, and exhausting the air between the aramid paper and the storage table 5. Specifically, the first motors 601 at both ends operate, and under the action of the first coupling 602, the first screw 603 rotates, so that the first slider 604 moves with the assistance of the first guide rods 605 on both sides. The first slider 604 moves, so that the brush 702 on the adjustment mechanism 7 connected to the first slider 604 moves, so that the brush 702 exhausts the air at the bottom of the aramid paper, so that the aramid paper is attached to the storage table 5.

[0093] After the aramid paper is attached to the storage table 5, the detection mechanism 10 is operated to measure the middle length of the aramid paper. Specifically, the second motor 1001 is operated, and the second screw 1003 is rotated under the action of the second coupling 1002, so that the second slider 1004 sleeved on the second screw 1003 moves under the action of the second guide rods 1005 on both sides, so that the CCD1007 installed at the bottom end of the second slider 1004 scans the middle of the aramid paper, and at the same time, the laser transmitter 1008 follows the CCD1007 to synchronously emit laser to illuminate the shooting center of the CCD1007. When the CCD1007 captures the junction of the aramid paper and the scale, the CCD1007 feeds back a signal to the controller, so that the second motor 1001 stops running, and then takes photos for evidence collection, and feeds back the data on the scale, and calculates the bow degree of the aramid paper through the feedback data.

[0094] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0095] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0096] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting and controlling the bow of aramid paper, comprising a support platform (1), characterized in that: A mounting groove (2) is provided on one side of the support platform (1); a top plate (3) is supported and mounted on the top of the support platform (1); two pillars (4) are mounted on the bottom of one side of the top plate (3); a storage platform (5) is supported and mounted between the two pillars (4) and the support platform (1); Moving mechanisms (6) are installed on both sides of the storage platform (5), and an adjustment mechanism (7) is installed on the moving mechanism (6); A pressing mechanism (9) is arranged in the installation groove (2), the bottom of the pressing mechanism (9) is supported by the installation groove (2), and the other end is pressed onto one side of the storage platform (5); A maintenance groove (8) is provided at the top end of the top plate (3), a detection mechanism (10) is installed in the maintenance groove (8), and the detection mechanism (10) is located at the top end of the middle part of the storage platform (5); The moving mechanism (6) comprises a first motor (601), wherein the first motor (601) is fixedly mounted in the mounting groove (2); A first coupling (602), one side of the first coupling (602) being fixedly connected to the first motor (601); A first screw rod (603), one end of the first screw rod (603) being fixedly connected to the other side of the first coupling (602); A first sliding block (604), the first sliding block (604) being spirally sleeved on the first screw rod (603); Two first guide rods (605), each of the first guide rods (605) is arranged on both sides of the first screw rod (603), and is respectively slidably plugged into both sides of the first sliding block (604), and has two ends respectively fixed on the support platform (1) and the support column (4); A first bearing seat (606), one side of the first bearing seat (606) being connected to the other end of the first screw rod (603), and the other side of the first bearing seat (606) being fixedly mounted on the support pillar (4); A support plate (607), wherein the support plate (607) is welded to one side of the first sliding block (604); The adjusting mechanism (7) comprises a lifting rod (701), the top end of the lifting rod (701) being fixedly mounted on a supporting plate (607); A brush (702), one side of the brush (702) being fixedly connected to the bottom end of the lifting rod (701); Two connecting blocks (703), each of the connecting blocks (703) is welded to two sides of the brush (702) and fixedly connected to the bottom end of the lifting rod (701); The pressing mechanism (9) comprises two hydraulic rods (901), each of the hydraulic rods (901) being fixedly arranged on two sides of the installation groove (2); A slide plate (902), one end of which is fixedly mounted on the top of the hydraulic rod (901) and is perpendicular to the hydraulic rod (901); A pressing plate (903), both ends of which are welded to the slide plates (902) on both sides, and are perpendicular to the slide plates (902); The detection mechanism (10) comprises a second motor (1001), and the second motor (1001) is mounted on one side of the maintenance slot (8) at the top of the support platform (1); A second coupling (1002), one side of the second coupling (1002) being fixedly connected to the second motor (1001); a second screw rod (1003), one end of the second screw rod (1003) being connected to the other side of the second coupling (1002); A second sliding block (1004), the second sliding block (1004) being spirally sleeved on the second screw rod (1003); Two second guide rods (1005), each of the second guide rods (1005) is arranged on both sides of the second screw rod (1003) and is slidably plugged on both sides of the second sliding block (1004); A second bearing seat (1006), one side of the second bearing seat (1006) being connected to the other end of the second screw rod (1003), and the other side of the second bearing seat (1006) being fixedly connected to the inner wall of the maintenance groove (8); CCD (1007), the CCD (1007) being mounted at the middle of the bottom end of the second slider (1004); A laser emitter (1008), wherein the laser emitter (1008) is installed on one side of the CCD (1007) and is located on the center line of the second slider (1004).

2. The aramid paper bow detection and control device according to claim 1, characterized in that: Two slide grooves are provided on the support platform (1) on one side of the installation groove (2), a slide plate (902) is inserted into each of the slide grooves, and the bottom of the slide groove is flush with the top of the storage platform (5).

3. The aramid paper bow detection and control device according to claim 1, characterized in that: A scale is provided in the middle of the storage platform (5), the scale has a measuring range of 10M, and the scale starts at the connection between the support platform (1) and the storage platform (5), and the marking on the scale is yellow.

4. The aramid paper bow detection and control device according to claim 1, characterized in that: The center of the CCD (1007) photographed on the storage table (5) is the same point as the emission end point of the laser emitter (1008), and the CCD (1007) is connected to a controller, and the color recognized by the CCD (1007) is the same as the color of the aramid paper.

5. A bow detection method using the aramid paper bow detection control device according to any one of claims 1 to 4, characterized in that: The specific steps are as follows: S1: First, lay a 10M wide aramid paper flat on the storage table (5), with one inner end connected to the inner wall of the support table (1); S2: After the aramid paper is laid flat on the storage table (5), the pressing mechanism (9) arranged in the installation groove (2) is operated to press and fix the edge of the aramid paper; S3: After the edge of the aramid paper is regulated, the adjusting mechanism (7) operates to adjust the height of the brush (702) so that the brush (702) is pressed against the aramid paper; S4: After the brush (702) is pressed against the aramid paper, the moving mechanisms (6) on both sides are operated, so that the brush (702) moves from one end of the aramid paper to the other end, thereby exhausting the air between the aramid paper and the storage table (5), so that the aramid paper is attached to the storage table (5); S5: After the aramid paper is attached to the storage table (5), the detection mechanism (10) at the top is operated, and the length of the aramid paper is identified by moving one end to the other end through the CCD (1007). When the CCD (1007) moves to the junction of the aramid paper and the scale at the other end, the laser emitted by the laser transmitter (1008) just irradiates the junction, and the CCD (1007) takes a picture to collect evidence; S6: The controller automatically processes the information of the photo taken by the CCD (1007), calculates the length of the aramid paper, and then feeds back the bow degree of the aramid paper according to the formula.

Images