A clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on absolute measurement method

Abstract

The present invention relates to the field of material testing equipment, and in particular to a clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on an absolute measurement method, comprising a workbench and a control mechanism, a rotating table provided on the control mechanism, a support frame provided on the rotating table, a height adjustment member provided on the support frame, a front and rear adjustment member provided on the height adjustment member, a connecting arm provided on the connecting arm, a mounting block provided on the mounting block, a rotating disk provided on the mounting block, a mounting groove provided at the front end of the rotating disk, a clamping assembly provided in the mounting groove, and a fine-tuning assembly provided between the clamping assembly and the rotating disk. When the present invention detects the retroreflection coefficient of flexible materials, even flexible materials of different thicknesses can quickly adjust the distance between the detection surface and the light source, thereby improving the detection accuracy and detection effect. The setting of the clamping assembly can not only unfold the wrinkles of the flexible material when it is fixed, but also avoid excessive stretching of the flexibility caused by excessive unfolding force, thereby improving the detection effect.

Description

Technical Field

[0001] The invention relates to the field of material detection equipment, in particular to a clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on an absolute measurement method. Background Art

[0002] Flexible materials are used as test samples. The absolute measurement method specified in GB 20653 "Protective clothing occupational high-visibility warning clothing" is used to test the retroreflection coefficient. The flexible materials need to be clamped and fixed to test the intensity of the retroreflected light received by the low-light illuminance meter after the standard A light source is projected onto the test sample under experimental conditions such as specific distance, specific observation angle and incident angle. The difficulty of using the above device is how to ensure that the light is vertically directed to the flexible material.

[0003] In order to solve the above problems, a high-precision turntable device has been provided in the existing equipment, which can adjust the height, front and back and three-dimensional angles. After adjustment, the light spot can be uniform and vertically hit the flexible material. However, the existing equipment still has shortcomings when used. Although the height, front and back and three-dimensional angles can be adjusted with high precision under the cooperation of sensors and control systems, the equipment is not designed for flexible materials. Therefore, there are still the following problems in the clamping of flexible materials. First, there will be an error in the distance between the detection surface of the flexible material and the projected light source. The main reason for this error is the different thickness of the flexible material itself. Although the range of this error is very small, it may be only about a few millimeters, but it will also have a certain impact on the detection result, resulting in inaccurate detection results. If the equipment needs to be readjusted because of this error, it is very cumbersome and affects the detection efficiency. Second, the clamping of the flexible material may cause wrinkles. For flexible materials with a harder texture, the clamping is very convenient. The detection can be carried out by directly clamping its edge, but for flexible materials with a softer texture, the above method cannot be used. In the prior art, when testing such flexible materials, glue is usually used to stick them on the back panel, but there is still a risk of wrinkles on the flexible material during the pasting process. In addition, if the glue on the back panel is not cleaned in time, it is easy to cause wrinkles on the flexible material, which will affect the detection of the retroreflection coefficient of the flexible material.

[0004] In order to solve the above problems, there is an urgent need for a clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on an absolute measurement method to improve the detection accuracy of the retroreflection coefficient of flexible materials. Summary of the invention

[0005] The technical problems to be solved by the present invention are: how to accurately measure the distance between the flexible material and the projection light source, how to ensure the fixed flatness of the flexible material and how to improve the repetitive accuracy of the detection of the retroreflection coefficient of the flexible material.

[0006] The present invention provides a clamping and positioning device for measuring the retroreflection coefficient of a flexible material based on an absolute measurement method, comprising a workbench and a control mechanism arranged on the workbench, a rotating platform being arranged above the control mechanism, an L-shaped support frame being arranged above the rotating platform, a height adjustment member being arranged on the vertical portion of the support frame, a front and rear adjustment member being arranged on the height adjustment member, a connecting arm being arranged on the front end of the connecting arm, a mounting block being arranged rotatably connected thereto, a rotating disk being arranged rotatably connected thereto on the mounting block, a mounting groove being arranged at the front end of the rotating disk, a clamping assembly for fixing the flexible material being arranged in the mounting groove, a fine-tuning assembly being arranged between the clamping assembly and the rotating disk, the fine-tuning assembly comprising a plurality of sliding grooves arranged at the bottom of the mounting groove, each of the sliding grooves being arranged in a first piston slidably matched therewith, and a connecting portion and a buffer being arranged at the back of the rotating disk. The storage part, the communicating part and the cache part are respectively provided with a communicating cavity and a cache cavity, the communicating cavity and the cache cavity are connected by a pipeline, and a control valve is provided on the pipeline between the communicating cavity and the cache cavity, the bottom of the sliding groove is connected with the communicating cavity through the pipeline, the cache cavity is provided with a second piston slidingly matched with it, the cache cavity is provided with a return spring for compressing the second piston toward the communicating cavity, the mounting block is provided with a flattening disk, one side of the flattening disk is provided with a connecting part, and the connecting part is rotatably connected to the mounting block, before detection, the flattening disk can be rotated to the front of the rotating disk to compress the clamping assembly into the mounting groove, so that the detection surface of the flexible material on the clamping assembly is on the same plane as the front end surface of the rotating disk, the rear end of the rotating disk is provided with a protective shell for covering the back of the fine-tuning assembly, one side of the protective shell is provided with a rotating shaft, and the rotating shaft is rotatably connected to the mounting block.

[0007] Further, the clamping assembly includes a base plate, and the side wall of the base plate is provided with four guide strip groups distributed in a circle and four fixed plates distributed in a circle, the four fixed plates correspond to the four guide strip groups one by one, and the fixed plates and the guide strip groups are slidably matched, the back of each fixed plate is provided with an adjustment slide groove, and each adjustment slide groove is provided with an adjustment slider slidably matched therewith, the back of the base plate is provided with a rotating knob connected to the rotation thereof, and the side wall of the rotating knob is provided with four circumferentially distributed protrusions, the four protrusions correspond to the four adjustment sliders one by one, and there is a corresponding protrusion between the corresponding protrusion and the adjustment slider. A connecting rod, wherein both ends of the connecting rod are respectively hinged with the protruding portion and the adjusting slider, each of the adjusting slide grooves is provided with a second spring that pushes the adjusting slider toward the direction of the substrate, a shell is provided on the back of the substrate for covering the connecting rod and the adjusting slider, the shell is fixedly connected to the substrate and a through hole is provided in the middle of the shell for the rotating knob to pass through, a plurality of plug rods are provided on the shell, the plurality of plug rods correspond to the plurality of sliding grooves one by one and the plug rods are plugged in with the sliding grooves, a fixing piece and a matching part are provided at the front end of each of the fixing plates, and the fixing piece and the matching part cooperate to fix the edge of the flexible material between the two.

[0008] Furthermore, a magnetic block is provided at the end of each of the insertion rods, and an iron piece that cooperates with the magnet by magnetic attraction is provided inside each of the first pistons.

[0009] Furthermore, a scale for observing angles is provided at the edge of the rotating disk, a connecting block fixedly connected to the mounting block is provided at one end, one end of the connecting block extends to the side of the rotating disk, and a pointer for comparing with the scale is provided on the connecting block.

[0010] Furthermore, the size of the installation groove is larger than the size of the clamping assembly, so that the fixing plate can still be installed in the installation groove after moving in a direction away from the base plate.

[0011] Furthermore, the depth of the mounting groove is greater than the thickness of the fixed plate, so that the front end of the clamping assembly clamps the flexible material so that after the thickness increases, it can further shrink into the mounting groove, so that the front end surface of the flexible material and the front end surface of the rotating disk are located in the same plane.

[0012] Furthermore, the flattening plate is provided with four avoidance holes, and the avoidance holes correspond to the matching parts.

[0013] Furthermore, four height-adjustable feet are provided below the workbench.

[0014] The beneficial effects of the present invention are:

[0015] When the present invention detects the retroreflection coefficient of flexible materials, even flexible materials of different thicknesses can quickly adjust the distance between the detection surface and the light source, thereby avoiding deviation and improving detection accuracy and detection effect.

[0016] The arrangement of the clamping assembly in the present invention can not only unfold the wrinkles of the flexible material when it is fixed, but also avoid excessive stretching of the flexibility due to excessive unfolding force, thereby improving the effect of detecting the retroreflection coefficient of the flexible material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 It is a schematic diagram of a partial three-dimensional structure of the present invention when the pressing plate is not working;

[0020] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention when the pressing plate is working;

[0021] Figure 4 This is a structural diagram of the protective shell and the rotating disk when they are separated in the present invention;

[0022] Figure 5 It is a front view of the rotating disk in the present invention;

[0023] Figure 6 The cross-sectional view of the rotating disk in the present invention Figure 1 ;

[0024] Figure 7 for Figure 6 The enlarged view of point A in the middle;

[0025] Figure 8 The cross-sectional view of the rotating disk in the present invention Figure 2 ;

[0026] Fig. 9 A partial exploded view of the clamping assembly of the present invention;

[0027] Fig.10 for Fig. 9 Enlarged view of point B in the middle.

[0028] Reference numerals: 1, workbench; 2, control mechanism; 3, rotating table; 4, support frame; 5, height adjustment member; 6, front and rear adjustment member; 7, connecting arm; 8, mounting block; 9, rotating disk; 10, mounting groove; 11, clamping assembly; 111, base plate; 112, guide bar group; 113, fixing plate; 114, adjusting slide groove; 115, adjusting slider; 116, rotating knob; 117, protrusion; 118, connecting rod; 119, second spring; 12, Fine-tuning assembly; 121, sliding groove; 122, first piston; 123, connecting chamber; 124, buffer chamber; 125, control valve; 126, second piston; 127, return spring; 128, flattening disk; 129, connecting part; 13, protective shell; 14, outer shell; 15, through hole; 16, plug rod; 17, fixing piece; 18, matching part; 19, magnetic block; 20, scale; 21, connecting block; 22, pointer; 23, avoidance hole; 24, support foot. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] In this embodiment, if Figures 1 to 10 As shown, a clamping and positioning device for measuring the retroreflection coefficient of a flexible material based on an absolute measurement method comprises a workbench 1, a control mechanism 2 arranged on the workbench 1, a rotating table 3 is arranged above the control mechanism 2, the control mechanism 2 is a prior art, and can control the operation of the equipment, a motor is arranged in the controller to drive the rotating table 3 to rotate, so that the present invention drives the flexible material to rotate in the horizontal direction, an L-shaped support frame 4 is arranged above the rotating table 3, a height adjustment member 5 is arranged on the vertical portion of the support frame 4, a front and rear adjustment member 6 is arranged on the height adjustment member 5, the height adjustment member 5 and the front and rear adjustment member 6 are both prior art, and can be implemented by electric cylinder technology, which will not be described in detail here.

[0031] The front and rear adjusting member 6 is provided with a connecting arm 7, the end of the connecting arm 7 is provided with a mounting block 8 rotatably connected thereto, and the mounting block 8 is provided with a rotating disk 9 rotatably connected thereto, Figure 1 , the rotating table 3 can drive the test material to rotate in the left and right directions, as shown by the arrow on the upper side of the rotating table 3, the rotating connection between the mounting block 8 and the connecting arm 7 enables the mounting block 8 to drive the rotating disk 9 and the flexible material to rotate in the front and rear directions, as shown by the arrow on the upper side of the connecting arm 7, the connection between the rotating disk 9 and the mounting block 8 can rotate in the up and down directions, as shown by the arrow on the lower side of the rotating disk 9, through the above design, the rotating disk 9 can drive the flexible material fixed thereon to rotate in six directions. The rotation between the connecting arm 7 and the mounting block 8 can be driven by a motor, which is a prior art and will not be repeated here.

[0032] A mounting groove 10 is provided at the front end of the rotating disk 9, and a clamping assembly 11 for fixing the flexible material is provided in the mounting groove 10. A fine-tuning assembly 12 is also provided between the clamping assembly 11 and the rotating disk 9. The fine-tuning assembly 12 includes a plurality of sliding grooves 121 arranged at the bottom of the mounting groove 10, and each sliding groove 121 is provided with a first piston 122 that slidably cooperates with the first piston 122. A connecting portion and a buffer portion are provided at the back of the rotating disk 9, and a connecting cavity 123 and a buffer cavity 124 are respectively provided inside the connecting portion and the buffer portion. The connecting cavity 123 and the buffer cavity 124 are connected through a pipeline, and a control valve 125 is provided on the pipeline between the connecting cavity 123 and the buffer cavity 124. The bottom of the sliding groove 121 is connected to the connecting cavity 123 through a pipeline, and a second piston 126 that slidably cooperates with the first piston 122 is provided in the buffer cavity 124. A return spring 127 compresses the second piston 126 in the direction of the connecting chamber 123. A flattening disk 128 is provided on the mounting block 8. A connecting portion 129 is provided on one side of the flattening disk 128. The connecting portion 129 is rotatably connected to the mounting block 8. Before detection, the flattening disk 128 can be rotated to the front of the rotating disk 9 to compress the clamping assembly 11 into the mounting groove 10, so that the detection surface of the flexible material on the clamping assembly 11 and the front end surface of the rotating disk 9 are located on the same plane. A protective shell 13 for covering the back of the fine-tuning assembly 12 is provided at the rear end of the rotating disk 9. A rotating shaft is provided on one side of the protective shell 13, and the rotating shaft is rotatably connected to the mounting block 8. The cavity connected between the first piston 122 and the second piston 126 is filled with hydraulic oil, so that the first piston 122 and the second piston 126 can push each other through the pressure transmitted by the hydraulic oil.The clamping assembly 11 includes a base plate 111, and four circumferentially distributed guide strip groups 112 and four circumferentially distributed fixed plates 113 are provided on the side wall of the base plate 111. The four fixed plates 113 correspond to the four guide strip groups 112 one by one, and the fixed plates 113 and the guide strip groups 112 are slidably matched. The back of each fixed plate 113 is provided with an adjustment slot 114, and each adjustment slot 114 is provided with an adjustment slider 115 slidably matched therewith. The back of the base plate 111 is provided with a rotating knob 116 rotatably connected thereto, and four circumferentially distributed protrusions 117 are provided on the side wall of the rotating knob 116. The four protrusions 117 correspond to the four adjustment sliders 115 one by one, and a connecting rod 118 is provided between the corresponding protrusions 117 and the adjustment sliders 115. The two ends of the connecting rod 118 are respectively hinged to the protrusion 117 and the adjusting slider 115, and each adjusting slide groove 114 is provided with a second spring 119 that pushes the adjusting slider 115 toward the direction of the substrate 111. The back of the substrate 111 is provided with a shell 14 for covering the connecting rod 118 and the adjusting slider 115. The shell 14 is fixedly connected to the substrate 111 and a through hole 15 is provided in the middle of the shell 14 for the rotating button 116 to pass through. A plurality of plug rods 16 are provided on the shell 14, and the plurality of plug rods 16 correspond to the plurality of sliding grooves 121 one by one and the plug rods 16 and the sliding grooves 121 are plugged and matched. A fixing piece 17 and a matching portion 18 are provided at the front end of each fixed plate 113, and the fixing piece 17 and the matching portion 18 cooperate to fix the edge of the flexible material between the two. The fixing member 17 and the matching part 18 are both implemented by existing technologies. For example, the fixing member 17 is a magnet, and the matching part 18 is made of an iron block. The edge of the flexible material can be fixed between the fixing member 17 and the matching part 18 by magnetic attraction. For another example, the fixing member 17 is a needle plate, and the matching part 18 is made of a material with a lower hardness. The needle on the needle plate passes through the flexible material and is inserted into the matching part 18, thereby fixing the edge of the flexible material between the fixing member 17 and the matching part 18. The above solutions are all existing technologies and can be selected according to actual conditions.

[0033] The present invention can further stretch and unfold the flexible material after being clamped through the structural design of the clamping assembly 11, thereby preventing wrinkles and improving the accuracy of the experiment. The specific working steps of the clamping assembly 11 are as follows: First, the edges of the flexible material are all fixed on the fixing plate 113 (such as Figure 2 As shown), then turn the rotary knob 116, refer to Fig. 9, turn the rotary knob 116 clockwise, and the connecting rod 118 will push the adjusting slider 115 away from the rotary knob 116. At this time, if the flexible material has wrinkles during the fixing process, the adjusting slider 115 will push the fixing plate 113 to slide along the guide bar group 112 under the elastic force of the second spring 119 when it moves, so as to unfold the wrinkles of the flexible material. If the flexible material has no wrinkles, since the edge of the flexible material is clamped on the fixing plate 113 by the fixing member 17 and the matching part 18, the flexible material will pull the fixing plate 113, making it unable to move, and the second spring 119 will be compressed, and the adjusting slider 115 will slide in the adjusting slot 114. The present invention can not only unfold the wrinkles of the flexible material when it is fixed, but also avoid excessive stretching of the flexibility caused by excessive unfolding force, and can improve the effect of detecting the retroreflection coefficient of the flexible material.

[0034] After the clamping assembly 11 completes the fixing and unfolding of the flexible material, the clamping assembly 11 needs to be fixed on the rotating disk 9. In addition, the position of the clamping assembly 11 needs to be adjusted so that the detection surface of the flexible material and the end surface of the rotating disk 9 are located on the same plane. Since the position of the equipment will be adjusted before use, that is, the distance between the center point of the end surface of the rotating disk 9 and the light source is fixed, and the light from the light source is perpendicular to the end surface of the rotating disk 9, when the flexible material and the clamping assembly 11 are fixed to the rotating disk 9, if fine-tuning is not performed, there will be a deviation in the distance between the detection surface of the flexible material and the light source. Although this deviation is small, it will also affect the detection result, so fine-tuning is required. The specific fine-tuning steps are: after the clamping assembly 11 completes the fixing and unfolding of the flexible material, insert the insertion rod 16 into the corresponding sliding groove 121 until the end of the insertion rod 16 contacts the first piston 122, refer to Figure 3At this time, the flattening plate 128 flips to the front end of the rotating plate 9 (the rotation of the flattening plate 128 can be manually operated or driven by a motor. The above methods are all prior art and will not be described in detail here). The flattening plate 128 will compress the clamping assembly 11 and the flexible material into the installation groove 10 until the detection surface of the flexible material and the end surface of the rotating plate 9 are located on the same plane. At this time, the insertion rod 16 will further move into the sliding groove 121, and will also push the first piston 122 to move into the sliding groove 121, thereby squeezing the hydraulic oil. At this time, the control valve 125 The hydraulic oil enters the buffer chamber 124, pushes the second piston 126 upward, and compresses the reset spring 127. When the detection surface of the flexible material and the end surface of the rotating disk 9 are located on the same plane and are stable, the positions of the first piston 122 and the second piston 126 are stable and no longer move, and the control valve 125 is closed. At this time, the position of the first piston 122 in the sliding groove 121 is locked, that is, the detection surface of the flexible material and the end surface of the rotating disk 9 are located on the same plane. This state is fixed. At this time, the flattening disk 128 is rotated away and the detection can be started. Through the above steps, when the present invention detects the retroreflection coefficient of flexible materials, even flexible materials of different thicknesses can quickly adjust the distance between the detection surface and the light source to avoid deviations and improve detection accuracy and detection effect.

[0035] It should be emphasized here that since the flexible material is manually fixed between the fixing part 17 and the matching part 18, there will definitely not be a large number of large wrinkles. Only slight wrinkles or bulges may occur during operation, and the size of the test sample itself is very small. Therefore, the clamping component 11 does not need to expand the flexible material to a large extent. It only needs to expand slightly within the range of 1-3 mm to flatten the flexible material so that it has no wrinkles or bulges.

[0036] Specifically, a magnetic block 19 is provided at the end of each insertion rod 16, and an iron piece that cooperates with the magnet is provided inside each first piston 122. Through the adsorption and cooperation between the magnetic block 19 and the iron piece, during the installation of the clamping assembly 11, the insertion rod 16 can better fit together with the first piston 122.

[0037] Specifically, a scale 20 for observing the angle is provided at the edge of the rotating disk 9, a connecting block 21 fixedly connected to the mounting block 8 is provided at one end, one end of the connecting block 21 extends to the side of the rotating disk 9, and a pointer 22 for comparing with the scale 20 is provided on the connecting block 21.

[0038] The size of the installation groove 10 is larger than that of the clamping assembly 11, so that the fixing plate 113 can still be installed in the installation groove 10 after moving away from the base plate 111. The depth of the installation groove 10 is greater than the thickness of the fixing plate 113, so that the front end of the clamping assembly 11 clamps the flexible material so that after the thickness increases, it can further shrink into the installation groove 10, so that the front end surface of the flexible material and the front end surface of the rotating disk 9 are located in the same plane.

[0039] In order to prevent the flexible material from being excessively pressed into the mounting groove 10 due to the arrangement of the matching portion 18 and the fixing member 17, which will cause the detection surface of the flexible material to contact the flattening disk 128 before the detection surface of the flexible material, four avoidance holes 23 are provided on the flattening disk 128, and the avoidance holes 23 correspond to the matching portion 18. When the flattening disk 128 is pressed toward the flexible material and the clamping assembly 11, it can avoid the matching portion 18 and the fixing member 17.

[0040] Specifically, four height-adjustable feet 24 are provided below the workbench 1 . The feet 24 are prior art and are mainly used to adjust the height of the workbench 1 on an unbalanced ground so that the upper end surface of the workbench 1 is in a horizontal state.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clamping and positioning device for measuring the retroreflection coefficient of a flexible material based on an absolute measurement method, comprising a workbench (1), a control mechanism (2) arranged on the workbench (1), a rotating table (3) arranged above the control mechanism (2), an L-shaped support frame (4) arranged above the rotating table (3), a height adjustment member (5) arranged on the vertical portion of the support frame (4), a front and rear adjustment member (6) arranged on the height adjustment member (5), a connecting arm (7) arranged on the front and rear adjustment member (6), and a mounting block (8) rotatably connected to the connecting arm (7) arranged at the end of the connecting arm (7), characterized in that: The mounting block (8) is provided with a rotating disk (9) rotatably connected thereto, a mounting groove (10) is provided at the front end of the rotating disk (9), a clamping assembly (11) for fixing the flexible material is provided in the mounting groove (10), a fine adjustment assembly (12) is provided between the clamping assembly (11) and the rotating disk (9), the fine adjustment assembly (12) comprises a plurality of sliding grooves (121) arranged at the bottom of the mounting groove (10), each of the sliding grooves (121) being provided with a first piston (122) slidably matched therewith, a connecting portion and a buffer portion are provided at the back of the rotating disk (9), a connecting cavity (123) and a buffer cavity (124) are respectively provided inside the connecting portion and the buffer portion, the connecting cavity (123) and the buffer cavity (124) are connected to each other via a pipeline, and a control valve (125) is provided on the pipeline between the connecting cavity (123) and the buffer cavity (124), the bottom of each of the sliding grooves (121) is connected to the connecting cavity (123) via a pipeline. The through cavity (123) is connected to the through cavity (123), the buffer cavity (124) is provided with a second piston (126) which is slidably matched with the buffer cavity (124), the buffer cavity (124) is provided with a return spring (127) for compressing the second piston (126) in the direction of the connecting cavity (123), the mounting block (8) is provided with a flattening disk (128), one side of the flattening disk (128) is provided with a connecting portion (129), the connecting portion (129) is rotatably connected to the mounting block (8), before detection, the flattening disk (128) can be rotated to the front of the rotating disk (9) to compress the clamping assembly (11) into the mounting groove (10), so that the detection surface of the flexible material on the clamping assembly (11) and the front end surface of the rotating disk (9) are located on the same plane, the rear end of the rotating disk (9) is provided with a protective shell (13) for covering the back of the fine adjustment assembly (12), one side of the protective shell (13) is provided with a rotating shaft, and the rotating shaft is rotatably connected to the mounting block (8).

2. A clamping and positioning device for measuring retroreflection coefficient of flexible materials based on absolute measurement method according to claim 1, characterized in that: The clamping assembly (11) comprises a base plate (111), and four circumferentially distributed guide strip groups (112) and four circumferentially distributed fixing plates (113) are provided on the side wall of the base plate (111), the four fixing plates (113) and the four guide strip groups (112) correspond one to one, and the fixing plates (113) and the guide strip groups (112) are slidably matched, and the back of each fixing plate (113) is provided with an adjustment slot (114), and each adjustment slot (114) is provided with a plurality of guide strip groups (112). An adjusting slider (115) is provided in the slide groove (114) and is slidably matched therewith. A rotating knob (116) is provided on the back of the base plate (111) and is rotatably connected therewith. Four circumferentially distributed protrusions (117) are provided on the side wall of the rotating knob (116). The four protrusions (117) correspond to the four adjusting sliders (115) one by one, and a connecting rod (118) is provided between the corresponding protrusions (117) and the adjusting sliders (115). The two ends of the connecting rod (118) are respectively hinged to the protruding portion (117) and the adjusting slider (115), each of the adjusting slide grooves (114) is provided with a second spring (119) for pushing the adjusting slider (115) toward the base plate (111), and the back of the base plate (111) is provided with a shell (14) for covering the connecting rod (118) and the adjusting slider (115), the shell (14) is fixedly connected to the base plate (111), and the middle of the shell (14) is provided with A through hole (15) is provided for the rotation button (116) to pass through, and a plurality of insertion rods (16) are provided on the housing (14). The plurality of insertion rods (16) correspond to the plurality of sliding grooves (121) one by one, and the insertion rods (16) and the sliding grooves (121) are plugged and matched. A fixing piece (17) and a matching portion (18) are provided at the front end of each fixing plate (113), and the fixing piece (17) and the matching portion (18) cooperate to fix the edge of the flexible material between the two.

3. A clamping and positioning device for measuring retroreflection coefficient of flexible materials based on absolute measurement method according to claim 2, characterized in that: A magnetic block (19) is provided at the end of each of the insertion rods (16), and an iron piece that cooperates with the magnet by magnetic attraction is provided inside each of the first pistons (122).

4. The clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on the absolute measurement method according to claim 1, characterized in that: A scale (20) for observing angles is provided at the edge of the rotating disk (9); a connecting block (21) fixedly connected to the mounting block (8) is provided at one end; one end of the connecting block (21) extends to the side of the rotating disk (9); and a pointer (22) for comparison with the scale (20) is provided on the connecting block (21).

5. The clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on the absolute measurement method according to claim 1, characterized in that: The size of the installation groove (10) is larger than the size of the clamping assembly (11), so that the fixing plate (113) can still be installed in the installation groove (10) after moving in a direction away from the base plate (111).

6. The clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on the absolute measurement method according to claim 1, characterized in that: The depth of the installation groove (10) is greater than the thickness of the fixed plate (113), so that the front end of the clamping assembly (11) clamps the flexible material so that after the thickness increases, it can further shrink into the installation groove (10), so that the front end surface of the flexible material and the front end surface of the rotating disk (9) are located in the same plane.

7. The clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on the absolute measurement method according to claim 1, characterized in that: The flattening disc (128) is provided with four avoidance holes (23), and the avoidance holes (23) correspond to the matching portions (18).

8. The clamping and positioning device for measuring the retroreflection coefficient of flexible materials based on the absolute measurement method according to claim 1, characterized in that: Four height-adjustable supporting feet (24) are provided below the workbench (1).

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