A rapid multi-point measurement system and method for acrylic sheet thickness

Abstract

The invention relates to the technical field of acrylic plate thickness measurement, and in particular to a system and method for measuring the thickness of an acrylic plate at multiple points. The system and method comprise a workbench, a controller, a detection mechanism, a cleaning mechanism and a positioning mechanism. The detection mechanism comprises a first laser distance measuring sensor, a lifting plate, an adjustment component, a driving component and three second laser distance measuring sensors. The cleaning mechanism comprises a slide plate, a sponge brush, two traction components and two swing components. The sponge brush is inserted at the bottom of the slide plate. The two swing components are symmetrically arranged at the top of the workbench. Each traction component is arranged between one end of the lifting plate and one swing component. The system and method for measuring the thickness of an acrylic plate at multiple points of the invention can reduce the measurement error, obtain the accurate thickness measurement value of the acrylic plate, and realize the multi-directional rapid measurement effect of the acrylic plate. There is no need for workers to hold tools to perform tests one by one, thereby improving the measurement efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of acrylic plate thickness measurement, and in particular to a system and method for rapid multi-point thickness measurement of acrylic plate. Background Art

[0002] Acrylic, also known as specially treated organic glass, is a replacement product of organic glass. Acrylic sheets made of acrylic materials have high hardness and weather resistance and are widely used in modern architecture, sanitary ware and handicrafts. In actual use, it is sometimes necessary to process acrylic sheets into shapes with different thicknesses in different places. Therefore, it is necessary to measure the thickness of the acrylic sheets in different places. The existing acrylic sheet thickness measurement mechanism takes a long time to measure acrylic sheets with complex shapes and different thicknesses in different places.

[0003] After acrylic sheets of different specifications are produced, the thickness of the sheets needs to be measured so that they can be better applied in the future.

[0004] There is no device specifically used to measure the thickness of acrylic sheets, so a ruler is generally used for measurement, which is inefficient and cannot comprehensively measure each area of ​​the acrylic sheet, and cannot guarantee that the thickness of each area of ​​the acrylic sheet is the same.

[0005] The prior art has the following deficiencies:

[0006] 1. Generally, the inspectors hold a ruler and measure multiple positions of the acrylic sheet one by one. It is impossible to measure multiple points of the acrylic sheet simultaneously, and the measurement efficiency needs to be improved.

[0007] 2. The factory environment is complex, and the surface of acrylic sheets is prone to dust and other impurities, making the surface rough and easily affecting the measurement accuracy. Summary of the invention

[0008] The object of the present invention is to provide a system and method for rapid multi-point measurement of the thickness of an acrylic sheet.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] A rapid multi-point measurement system for the thickness of acrylic sheets is provided, comprising a workbench, wherein two supporting legs are fixedly arranged at the bottom of the workbench.

[0011] It also includes a controller, a detection mechanism, a cleaning mechanism and a positioning mechanism;

[0012] The detection mechanism is arranged on the top of the workbench, and the detection mechanism includes a first laser ranging sensor, a lifting plate, an adjustment component, a driving component and three second laser ranging sensors. A support plate is fixedly arranged on the top of the workbench, two guide rails are fixedly arranged on the outer wall of the support plate, and a first slider is slidably arranged on the outer wall of each guide rail. The lifting plate is fixedly arranged between the two first sliders, the driving component is arranged on the support plate, the adjustment component is arranged on the lifting plate, the three second laser ranging sensors are respectively arranged on the bottom of the lifting plate and the adjustment component, and the first laser ranging sensor is arranged on the top of the lifting plate;

[0013] The cleaning mechanism is arranged on the top of the workbench, and the cleaning mechanism includes a slide plate, a sponge brush, two traction components and two swing components. Two guide plates are symmetrically arranged on the top of the workbench, and a guide groove is arranged on the outer wall of each guide plate. The slide plate is slidably arranged between the two guide grooves through two first insertion rods, and the sponge brush is inserted at the bottom of the slide plate. The two swing components are symmetrically arranged on the top of the workbench, and each traction component is arranged between one end of the lifting plate and a swing component.

[0014] The positioning mechanism is arranged on the top of the workbench, and the first laser distance measuring sensor, the adjustment component, the driving component and each second laser distance measuring sensor are electrically connected to the controller.

[0015] Furthermore, the driving assembly includes a double-axis cylinder and a push plate, the double-axis cylinder is fixed on the top of the support plate, the push plate is fixed between its output end and the lifting plate, and the double-axis cylinder is electrically connected to the controller.

[0016] Furthermore, the adjustment component includes a stepper motor, a turntable, two connecting rods, two push blocks and two second sliders. A U-shaped plate is fixedly provided on the top of the lifting plate, the stepper motor is inserted into the U-shaped plate, the turntable is fixed on its output end, four slide rails are symmetrically provided on the top of the lifting plate, each second slider is slidably provided on the top of a slide rail, each push block is fixed between the tops of two second sliders, each connecting rod is hingedly provided between the turntable and a push block, and two second laser ranging sensors away from the turntable are respectively fixedly provided at the bottom of the two push blocks, and the stepper motor is electrically connected to the controller.

[0017] Furthermore, an indicator rod is fixedly provided on the outer wall at one end of each push block, and two scale values ​​are symmetrically provided on the top of the lifting plate, and each indicator rod faces one scale value.

[0018] Furthermore, an electric push rod is fixedly provided on the top of the lifting plate, a mounting plate is fixedly provided on the output end thereof, the first laser ranging sensor is fixedly provided on the bottom of the mounting plate, and the electric push rod is electrically connected to the controller.

[0019] Furthermore, each traction assembly includes a lifting rod, a pull rope, a pull block, a second plug rod, a limiting wheel, a sliding rod and a reset spring. Two support rods are fixedly provided on the top of the workbench, and two limiting blocks are fixedly provided on the top of each support rod. The sliding rod is slidably arranged between the two limiting blocks, the pull block is fixedly arranged at one end of the sliding rod, the second plug rod is fixedly arranged on the outer wall of the pull block, the reset spring is sleeved on the outer wall of the sliding rod, the lifting rod is fixedly arranged at the bottom of the lifting plate, the pull rope is fixedly arranged between the end of the pull block away from the sliding rod and the end of the lifting rod away from the top of the lifting plate, the limiting wheel is rotatably arranged on the top of the support plate through the L-shaped rod, and the outer wall of the pull rope is fitted with the outer edge of the limiting wheel.

[0020] Furthermore, each swing assembly includes a swing arm, a rotating shaft and a limit plate. The limit plate is fixed on the outer wall of one of the support rods, the rotating shaft is rotatably arranged on the limit plate, the swing arm is fixed at one end of the rotating shaft away from the limit plate, and two slots are provided at both ends of the swing arm, and the first plug rod and the second plug rod are respectively plugged into the two slots.

[0021] Furthermore, the positioning mechanism includes four slide grooves and four clamping components. The four slide grooves are symmetrically arranged on the top of the workbench. Each clamping component includes a clamping plate, a sliding bar and a telescopic spring. Each sliding bar is slidably arranged inside a slide groove, and each clamping plate is fixed on the top of a sliding bar. The inner wall of each slide groove and the outer wall of each sliding bar are respectively fixedly connected to the two ends of a telescopic spring.

[0022] Furthermore, two avoidance grooves are symmetrically arranged on the top of the workbench.

[0023] A method for measuring the thickness of an acrylic sheet material by a rapid multi-point measurement system, comprising the following steps:

[0024] S1: Positioning of acrylic sheet:

[0025] When performing rapid multi-point measurement of the thickness of acrylic sheets, first place the acrylic sheet on the top of the workbench, and use four clamps to position the acrylic sheet at four points to prevent the scraper from driving the sponge brush to move the acrylic sheet when cleaning it, thereby affecting the thickness measurement effect. The slide bar allows the clamp to slide longitudinally, and the telescopic spring can press against the edge of the acrylic sheet at the end of the clamp sliding, thereby meeting the positioning requirements of sheets of different sizes, thereby improving the flexibility of the system.

[0026] S2: Rapid multi-point detection of acrylic sheet thickness:

[0027] When the acrylic sheet is positioned, the dual-axis cylinder is started by the controller, so that its output end drops vertically. Since its output end is fixedly connected to the lifting plate through the push plate, the three second laser ranging sensors at the bottom of the lifting plate are driven to drop vertically, that is, move toward the acrylic sheet to the standard measurement distance.

[0028] When the three second laser ranging sensors move toward the acrylic sheet to the standard measurement distance, the first laser ranging sensor and the three second laser ranging sensors are started by the controller. The first laser ranging sensor directly emits laser to the workbench for distance measurement, and this distance is set to A. The three second laser ranging sensors directly send laser to the top of the acrylic sheet for distance measurement, and this distance is set to B. The thickness of the acrylic sheet is obtained by subtracting the distance B from the distance A. By designing three second laser ranging sensors, and the three second laser ranging sensors mainly measure the middle area of ​​the acrylic sheet, the average of the three measured thicknesses is taken to reduce the measurement error, and the accurate thickness measurement value of the acrylic sheet can be obtained, thereby achieving a multi-directional measurement effect of the acrylic sheet.

[0029] S3: Synchronous cleaning of acrylic sheet thickness measurement:

[0030] While the lifting plate drives the first laser ranging sensor and the three second ranging sensors to descend vertically, since the lifting plate and the pull rope are respectively fixedly connected to the two ends of the lifting rod, the end of the pull rope away from the lifting rod is fixedly connected to the sliding rod through the pull block, and the sliding rod is slidably connected to the two limit blocks. Under the limiting action of the limit wheel, the lifting rod drives the pull block to slide toward the end away from the limit block through the pull rope, thereby driving the sliding rod to slide between the two limit blocks toward the end close to the limit wheel through the pull block. In this process, the reset spring changes from the initial state to the tensioned state.

[0031] When the pulling block drives the sliding rod to slide between the two limit blocks toward one end close to the limit wheel, since the swing rod is rotatably connected to the limit plate through the rotating shaft, the limit plate is fixedly connected to the support rod, the second plug rod is plugged into one of the slots at the top of the swing rod, the first plug rod is plugged into another slot at the bottom of the swing rod, and the slide plate is slidably connected to the two guide grooves on the two guide plates through the two first plug rods, and then the slot at the top of the swing rod is pulled by the second plug rod to make the swing rod rotate, thereby driving one of the second plug rods to slide through the slot at the bottom of the swing rod, and then the top surface of the acrylic sheet to be inspected is cleaned by the sponge brush at the bottom of the slide plate, thereby achieving a cleaning effect, preventing impurities on the top surface of the acrylic sheet from affecting the laser irradiation effect and affecting the measurement effect.

[0032] The avoidance groove provides an avoidance space for the workbench to the swing arm when the swing arm rotates, so as to prevent the swing arm from colliding with the workbench when rotating.

[0033] S4: Thickness adjustment of acrylic sheets of different sizes:

[0034] When the size of the acrylic sheet to be measured changes, mainly when the length and width change, the stepper motor is started through the controller, so that its output end drives the turntable to rotate. Since the turntable and a push block are respectively connected to the two ends of each connecting rod, each push block is slidably connected to the two slide rails through two second sliders, and each second ranging sensor is fixedly connected to the bottom of a push block, thereby driving the two second laser ranging sensors on both sides to move away from each other, so as to adjust the spacing between the three second laser ranging sensors, meet the requirements of multi-point precise measurement of acrylic sheets of different sizes, and improve the flexibility of the measurement system.

[0035] While the two second laser ranging sensors on both sides slide, since each indicator rod is fixedly connected to a push block, the top of the drop plate is symmetrically designed with two scale values, and each indicator rod faces one scale value, so as to accurately adjust the sliding distance of the two second laser ranging sensors on both sides, that is, accurately adjust the spacing between the three second laser ranging sensors, thereby improving the accuracy of multi-point measurement of the thickness of the acrylic sheet.

[0036] When the length and width of the acrylic sheet changes, the controller starts the electric push rod, so that its output end drives the mounting plate to extend toward the end close to the guide plate, thereby driving the first laser ranging sensor on the mounting plate to extend toward the end close to the guide plate, ensuring that even if the size of the acrylic sheet to be measured changes, the first laser ranging sensor can always emit laser to the top of the workbench to achieve distance measurement.

[0037] Beneficial effects of the present invention:

[0038] 1. The present invention designs a detection mechanism, namely, a first laser ranging sensor, a lifting plate, an adjustment component, a driving component and three second laser ranging sensors. When the three second laser ranging sensors move toward the acrylic sheet to the standard measurement distance, the first laser ranging sensor and the three second laser ranging sensors are started by a controller. The first laser ranging sensor directly emits laser to the workbench to measure the distance, and this distance is set to A. The three second laser ranging sensors directly send laser to the top of the acrylic sheet to measure the distance, and this distance is set to B. The A distance minus the B distance is the thickness of the acrylic sheet. By designing three second laser ranging sensors, and the three second laser ranging sensors mainly measure the middle area of ​​the acrylic sheet, the average of the three measured thicknesses is taken to reduce the measurement error, and the accurate thickness measurement value of the acrylic sheet can be obtained, so as to achieve a multi-directional rapid measurement effect of the acrylic sheet, without the need for workers to hold tools to test one by one, thereby improving the measurement efficiency.

[0039] 2. The present invention designs a traction component. While the lifting plate drives the first laser ranging sensor and the three second ranging sensors to vertically descend, the sponge brush at the bottom of the slide board can simultaneously clean the top surface of the acrylic sheet to be detected, thereby achieving a cleaning effect and preventing impurities on the top surface of the acrylic sheet from affecting the laser irradiation effect and thus affecting the measurement effect.

[0040] 3. The present invention designs an electric push rod. When the length and width of the acrylic sheet change, the electric push rod is started by the controller, so that the output end drives the mounting plate to extend toward the end close to the guide plate, thereby driving the first laser ranging sensor on the mounting plate to extend toward the end close to the guide plate. This ensures that even if the size of the acrylic sheet to be measured changes, the first laser ranging sensor can always emit laser to the top of the workbench to achieve ranging.

[0041] The present invention designs a positioning mechanism, namely, four slide grooves and four pressing components. When performing rapid multi-point thickness measurement of an acrylic sheet, the acrylic sheet is first placed on the top of a workbench, and four clamps are used to perform four-point positioning of the acrylic sheet to prevent the scraper from driving the sponge brush to move the acrylic sheet when cleaning the acrylic sheet, thereby preventing the thickness measurement effect from being affected. The slide bar can make the clamp slide longitudinally, and the telescopic spring can press against the edge of the acrylic sheet when the clamp slides, thereby meeting the positioning requirements of sheets of different sizes, thereby improving the flexibility of the measurement system.

[0042] The present invention can realize the synchronous operation of the detection mechanism and the cleaning mechanism by designing the traction component, that is, when the lifting plate drives the first laser ranging sensor and the three second ranging sensors to vertically descend, the top surface of the acrylic plate to be detected can be cleaned synchronously by the sponge brush at the bottom of the slide plate, so as to achieve a cleaning effect, prevent impurities on the top surface of the acrylic plate from affecting the laser irradiation effect and thus affecting the measurement effect, and can reduce the number of driving sources used in the system, reduce the power consumption of the system, and help save measurement costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings in the embodiment of the present invention are briefly introduced below.

[0044] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0045] Figure 2 for Figure 1 A in the enlarged view;

[0046] Figure 3 for Figure 1 The enlarged view of point B in the figure;

[0047] Figure 4The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0048] Figure 5 for Figure 4 The enlarged view of point C in the figure;

[0049] Figure 6 for Figure 4 The enlarged view of point D in the figure;

[0050] Figure 7 for Figure 4 The enlarged view of point E in the figure;

[0051] Figure 8 It is a front view of the present invention;

[0052] Fig. 9 for Figure 8 The enlarged view of F in the figure;

[0053] Fig.10 is a side view of the present invention;

[0054] Fig.11 for Fig.10 The enlarged view of G in the figure;

[0055] In the figure: workbench 11, first laser ranging sensor 12, lifting plate 13, second laser ranging sensor 14, support plate 15, guide rail 16, first slider 17, slide plate 18, sponge brush 19, guide plate 20, guide groove 21, first plug rod 22, double-axis cylinder 23, push plate 24, stepper motor 25, turntable 26, connecting rod 27, push block 28, second slider 29, slide rail 30, indicator rod 31, scale value 32, electric push rod 33, mounting plate 34, lifting rod 35, pull rope 36, pull block 37, second plug rod 38, limit wheel 39, slide rod 40, return spring 41, limit block 42, rocker arm 43, rotating shaft 44, limit plate 45, slot 46, slide groove 47, splint 48, slide bar 49, telescopic spring 50, avoidance groove 51. DETAILED DESCRIPTION

[0056] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0057] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and they should not be understood as limitations of the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product.

[0058] A rapid multi-point measurement system for the thickness of an acrylic plate comprises a workbench 11, wherein two supporting legs are fixedly provided at the bottom of the workbench 11;

[0059] It also includes a controller, a detection mechanism, a cleaning mechanism and a positioning mechanism;

[0060] The detection mechanism is arranged on the top of the workbench 11, and the detection mechanism includes a first laser ranging sensor 12, a lifting plate 13, an adjustment component, a driving component and three second laser ranging sensors 14. A support plate 15 is fixedly arranged on the top of the workbench 11, two guide rails 16 are fixedly arranged on the outer wall of the support plate 15, and a first slider 17 is slidably arranged on the outer wall of each guide rail 16. The lifting plate 13 is fixedly arranged between the two first sliders 17, the driving component is arranged on the support plate 15, the adjustment component is arranged on the lifting plate 13, the three second laser ranging sensors 14 are respectively arranged on the bottom of the lifting plate 13 and the adjustment component, and the first laser ranging sensor 12 is arranged on the top of the lifting plate 13;

[0061] The cleaning mechanism is arranged on the top of the workbench 11, and the cleaning mechanism includes a slide plate 18, a sponge brush 19, two traction components and two swing components. Two guide plates 20 are symmetrically arranged on the top of the workbench 11, and a guide groove 21 is arranged on the outer wall of each guide plate 20. The slide plate 18 is slidably arranged between the two guide grooves 21 through two first insertion rods 22, and the sponge brush 19 is inserted at the bottom of the slide plate 18. The two swing components are symmetrically arranged on the top of the workbench 11, and each traction component is arranged between one end of the lifting plate 13 and a swing component.

[0062] The positioning mechanism is arranged on the top of the workbench 11 , and the first laser distance measuring sensor 12 , the adjustment component, the driving component and each second laser distance measuring sensor 14 are electrically connected to the controller.

[0063] Reference Figures 1 to 11 As shown, the driving assembly includes a double-axis cylinder 23 and a push plate 24. The double-axis cylinder 23 is fixed on the top of the support plate 15, and the push plate 24 is fixed between its output end and the lifting plate 13. The double-axis cylinder 23 is electrically connected to the controller. When the acrylic sheet is positioned, the double-axis cylinder 23 is started by the controller, so that its output end is vertically lowered. Since its output end is fixedly connected to the lifting plate 13 through the push plate 24, the three second laser ranging sensors 14 at the bottom of the lifting plate 13 are driven to vertically descend, that is, move toward the acrylic sheet to the standard measurement distance.

[0064] Reference Figures 1 to 11As shown, the adjustment component includes a stepper motor 25, a turntable 26, two connecting rods 27, two push blocks 28 and two second sliders 29. A U-shaped plate is fixedly arranged on the top of the lifting plate 13, and the stepper motor 25 is inserted on the U-shaped plate. The turntable 26 is fixed on its output end. Four slide rails 30 are symmetrically arranged on the top of the lifting plate 13. Each second slider 29 is slidably arranged on the top of a slide rail 30. Each push block 28 is fixed between the tops of two second sliders 29. Each connecting rod 27 is hingedly arranged between the turntable 26 and a push block 28. Two second laser ranging sensors 14 away from the turntable 26 are respectively fixed at the bottom of the two push blocks 28. The stepper motor 25 and the control The controller is electrically connected. When the size of the acrylic sheet to be measured changes, mainly when the length and width change, the stepper motor 25 is started by the controller, so that its output end drives the turntable 26 to rotate. Since the turntable 26 and a push block 28 are respectively connected to the two ends of each connecting rod 27, each push block 28 is slidably connected to the two slide rails 30 through two second sliders 29, and each second ranging sensor is fixedly connected to the bottom of a push block 28, thereby driving the two second laser ranging sensors 14 on both sides to move away from each other, so as to adjust the spacing between the three second laser ranging sensors 14, meet the multi-point accurate measurement requirements of acrylic sheets of different sizes, and improve the flexibility of the measurement system.

[0065] Reference Figures 1 to 11 As shown, an indicator rod 31 is fixed on the outer wall of one end of each push block 28, and two scale values ​​32 are symmetrically arranged on the top of the lifting plate 13, and each indicator rod 31 is oriented toward one scale value 32. When the two second laser ranging sensors 14 on both sides slide, since each indicator rod 31 is fixedly connected to a push block 28, the top of the lowering plate is symmetrically designed with two scale values ​​32, and each indicator rod 31 is oriented toward one scale value 32, so that the sliding distance of the two second laser ranging sensors 14 on both sides can be accurately adjusted, that is, the spacing between the three second laser ranging sensors 14 can be accurately adjusted, thereby improving the accuracy of multi-point measurement of the thickness of the acrylic sheet.

[0066] Reference Figures 1 to 11As shown, an electric push rod 33 is fixedly provided on the top of the lifting plate 13, and a mounting plate 34 is fixedly provided on the output end thereof. The first laser distance measuring sensor 12 is fixedly provided at the bottom of the mounting plate 34, and the electric push rod 33 is electrically connected to the controller. When the three second laser distance measuring sensors 14 move toward the acrylic sheet to the standard measuring distance, the first laser distance measuring sensor 12 and the three second laser distance measuring sensors 14 are started by the controller, and the first laser distance measuring sensor 12 directly emits a laser to the workbench 11 for distance measurement, and this distance is set to A, and the three second laser distance measuring sensors 14 directly send a laser to the top of the acrylic sheet for distance measurement, and this distance is set to B. The distance A minus the distance B is the thickness of the acrylic sheet. By designing the three second laser distance measuring sensors 14, the first laser distance measuring sensor 12 and the three second laser distance measuring sensors 14 are directly sent to the top of the acrylic sheet for distance measurement, and this distance is set to B. The optical ranging sensor 14 and the three second laser ranging sensors 14 mainly measure the middle area of ​​the acrylic sheet. The three measured thicknesses are averaged to reduce the measurement error, and the accurate thickness measurement value of the acrylic sheet can be obtained, so as to achieve the multi-directional measurement effect of the acrylic sheet. It should be noted that when the length and width of the acrylic sheet change, the electric push rod 33 is started by the controller, so that its output end drives the mounting plate 34 to extend toward the end close to the guide plate 20, thereby driving the first laser ranging sensor 12 on the mounting plate 34 to extend toward the end close to the guide plate 20, which can ensure that even if the size of the acrylic sheet to be measured changes, the first laser ranging sensor 12 can always emit laser to the top of the workbench 11 to achieve ranging.

[0067] Reference Figures 1 to 11As shown, each traction assembly includes a lifting rod 35, a pull rope 36, a pull block 37, a second plug rod 38, a limiting wheel 39, a slide bar 40 and a reset spring 41. Two support rods are fixedly provided on the top of the workbench 11. Two limiting blocks 42 are fixedly provided on the top of each support rod. The slide bar 40 is slidably arranged between the two limiting blocks 42. The pull block 37 is fixedly arranged at one end of the slide bar 40. The second plug rod 38 is fixedly arranged on the outer wall of the pull block 37. The reset spring 41 is sleeved on the outer wall of the slide bar 40. The lifting rod 35 is fixedly arranged at the bottom of the lifting plate 13. The pull rope 36 is fixedly arranged between the end of the pull block 37 away from the slide bar 40 and the end of the top of the lifting rod 35 away from the lifting plate 13. The limiting wheel 39 is rotatably arranged on the support plate 1 through the L-shaped rod. 5, the outer wall of the pull rope 36 is fitted with the outer edge of the limiting wheel 39. When the lifting plate 13 drives the first laser ranging sensor 12 and the three second ranging sensors to vertically descend, since the lifting plate 13 and the pull rope 36 are respectively fixedly connected to the two ends of the lifting rod 35, the end of the pull rope 36 away from the lifting rod 35 is fixedly connected to the slide bar 40 through the pull block 37, and the slide bar 40 is slidably connected to the two limiting blocks 42. Under the limiting action of the limiting wheel 39, the lifting rod 35 drives the pull block 37 to slide toward the end away from the limiting block 42 through the pull rope 36, thereby driving the slide bar 40 to slide between the two limiting blocks 42 toward the end close to the limiting wheel 39 through the pull block 37. In this process, the reset spring 41 changes from the initial state to the tensioned state.

[0068] Reference Figures 1 to 11 As shown, each swing assembly includes a swing rod 43, a rotating shaft 44 and a limiting plate 45. The limiting plate 45 is fixedly arranged on the outer wall of one of the support rods, and the rotating shaft 44 is rotatably arranged on the limiting plate 45. The swing rod 43 is fixedly arranged at one end of the rotating shaft 44 away from the limiting plate 45. Two slots 46 are provided at both ends of the swing rod 43. The first plug rod 22 and the second plug rod 38 are respectively plugged into the two slots 46. When the pull block 37 drives the sliding rod 40 to slide between the two limiting blocks 42 toward the end close to the limiting wheel 39, since the swing rod 43 is rotatably connected to the limiting plate 45 through the rotating shaft 44, the limiting plate 45 is fixedly connected to the support rod, and the second plug rod 38 is connected to the limiting wheel 39. One of the slots 46 at the top of the pendulum rod 43 is plugged in, the first plug rod 22 is plugged in with the other slot 46 at the bottom of the pendulum rod 43, and the slide plate 18 is slidably connected with the two guide grooves 21 on the two guide plates 20 through the two first plug rods 22, and then the slot 46 at the top of the pendulum rod 43 is pulled by the second plug rod 38, so that the pendulum rod 43 rotates, thereby driving one of the second plug rods 38 to slide through the slot 46 at the bottom of the pendulum rod 43, and then the top surface of the acrylic sheet to be inspected is cleaned by the sponge brush 19 at the bottom of the slide plate 18, which has a cleaning effect and prevents impurities on the top surface of the acrylic sheet from affecting the laser irradiation effect and affecting the measurement effect.

[0069] Reference Figures 1 to 11As shown, the positioning mechanism includes four slide grooves 47 and four clamping components. The four slide grooves 47 are symmetrically arranged on the top of the workbench 11. Each clamping component includes a clamping plate 48, a slide bar 49 and a telescopic spring 50. Each slide bar 49 is slidably arranged inside a slide groove 47, and each clamping plate 48 is fixedly arranged on the top of a slide bar 49. The inner wall of each slide groove 47 and the outer wall of each slide bar 49 are respectively fixedly connected to the two ends of a telescopic spring 50. When performing rapid multi-point measurement of the thickness of the acrylic sheet, the acrylic sheet is first placed on the top of the workbench 11, and the four clamping plates 48 are used to perform four-point positioning of the acrylic sheet to prevent the scraper from driving the sponge brush 19 to move the acrylic sheet when cleaning the acrylic sheet and affecting the thickness measurement effect. The slide bar 49 can make the clamping plate 48 slide longitudinally, and the telescopic spring 50 can clamp the edge of the acrylic sheet after the clamping plate 48 slides, thereby meeting the positioning requirements of sheets of different sizes, thereby improving the flexibility of the system.

[0070] Reference Figures 1 to 11 As shown, two avoidance grooves 51 are symmetrically arranged on the top of the workbench 11. The avoidance grooves 51 provide avoidance space for the workbench 11 and the swing rod 43 when the swing rod 43 rotates, thereby preventing the swing rod 43 from colliding with the workbench 11 when rotating.

[0071] A method for measuring the thickness of an acrylic sheet material by a rapid multi-point measurement system, comprising the following steps:

[0072] S1: Positioning of acrylic sheet:

[0073] When performing rapid multi-point measurement of the thickness of an acrylic sheet, first place the acrylic sheet on the top of the workbench 11, and use four clamps 48 to perform four-point positioning on the acrylic sheet to prevent the scraper from driving the sponge brush 19 to move the acrylic sheet when cleaning the acrylic sheet and affecting the thickness measurement effect. The slide bar 49 can make the clamp 48 slide longitudinally, and the telescopic spring 50 can press against the edge of the acrylic sheet when the clamp 48 finishes sliding, thereby meeting the positioning requirements of sheets of different sizes, thereby improving the flexibility of the system.

[0074] S2: Rapid multi-point detection of acrylic sheet thickness:

[0075] When the acrylic sheet is positioned, the dual-axis cylinder 23 is started by the controller, so that its output end drops vertically. Since its output end is fixedly connected to the lifting plate 13 through the push plate 24, the three second laser ranging sensors 14 at the bottom of the lifting plate 13 are driven to drop vertically, that is, move toward the acrylic sheet to the standard measurement distance.

[0076] When the three second laser ranging sensors 14 move toward the acrylic sheet to the standard measurement distance, the first laser ranging sensor 12 and the three second laser ranging sensors 14 are started by the controller, the first laser ranging sensor 12 directly emits laser to the workbench 11 for distance measurement, and this distance is set to A, while the three second laser ranging sensors 14 directly send laser to the top of the acrylic sheet for distance measurement, and this distance is set to B, and the thickness of the acrylic sheet is obtained by subtracting the distance B from the distance A. By designing three second laser ranging sensors 14, and the three second laser ranging sensors 14 mainly measure the middle area of ​​the acrylic sheet, the three measured thicknesses are averaged to reduce the measurement error, and the accurate thickness measurement value of the acrylic sheet can be obtained, thereby achieving a multi-directional measurement effect of the acrylic sheet.

[0077] S3: Synchronous cleaning of acrylic sheet thickness measurement:

[0078] While the lifting plate 13 drives the first laser ranging sensor 12 and the three second ranging sensors to descend vertically, since the lifting plate 13 and the pull rope 36 are respectively fixedly connected to the two ends of the lifting rod 35, the end of the pull rope 36 away from the lifting rod 35 is fixedly connected to the slide bar 40 through the pull block 37, and the slide bar 40 is slidably connected to the two limit blocks 42. Under the limiting action of the limit wheel 39, the lifting rod 35 drives the pull block 37 to slide toward the end away from the limit block 42 through the pull rope 36, thereby driving the slide bar 40 to slide between the two limit blocks 42 toward the end close to the limit wheel 39 through the pull block 37. In this process, the reset spring 41 changes from the initial state to the tensioned state.

[0079] When the pull block 37 drives the sliding rod 40 to slide between the two limit blocks 42 toward one end close to the limit wheel 39, since the swing rod 43 is rotatably connected to the limit plate 45 through the rotating shaft 44, the limit plate 45 is fixedly connected to the support rod, the second plug rod 38 is plugged into one of the slots 46 at the top of the swing rod 43, the first plug rod 22 is plugged into the other slot 46 at the bottom of the swing rod 43, and the slide plate 18 is slidably connected to the two guide grooves 21 on the two guide plates 20 through the two first plug rods 22, and then the second plug rod 38 pulls the slot 46 at the top of the swing rod 43, so that the swing rod 43 rotates, thereby driving one of the second plug rods 38 to slide through the slot 46 at the bottom of the swing rod 43, and then the sponge brush 19 at the bottom of the slide plate 18 cleans the top surface of the acrylic sheet to be inspected, thereby achieving a cleaning effect, preventing impurities on the top surface of the acrylic sheet from affecting the laser irradiation effect and affecting the measurement effect.

[0080] The avoidance groove 51 provides an avoidance space for the workbench 11 and the swing rod 43 when the swing rod 43 rotates, so as to prevent the swing rod 43 from colliding with the workbench 11 when rotating.

[0081] S4: Thickness adjustment of acrylic sheets of different sizes:

[0082] When the size of the acrylic sheet to be measured changes, mainly when the length and width change, the stepper motor 25 is started by the controller, so that its output end drives the turntable 26 to rotate. Since the turntable 26 and a push block 28 are respectively connected to the two ends of each connecting rod 27, each push block 28 is slidably connected to the two slide rails 30 through two second sliders 29, and each second ranging sensor is fixedly connected to the bottom of a push block 28, thereby driving the two second laser ranging sensors 14 on both sides to move away from each other, so as to adjust the spacing between the three second laser ranging sensors 14, meet the multi-point accurate measurement requirements of acrylic sheets of different sizes, and improve the flexibility of the measurement system.

[0083] While the two second laser ranging sensors 14 on both sides slide, since each indicator rod 31 is fixedly connected to a push block 28, the top of the drop plate is symmetrically designed with two scale values ​​32, and each indicator rod 31 faces a scale value 32, so that the sliding distance of the two second laser ranging sensors 14 on both sides can be accurately adjusted, that is, the spacing between the three second laser ranging sensors 14 can be accurately adjusted, thereby improving the accuracy of multi-point measurement of the thickness of the acrylic sheet.

[0084] When the length and width of the acrylic sheet changes, the controller starts the electric push rod 33, so that its output end drives the mounting plate 34 to extend toward the end close to the guide plate 20, thereby driving the first laser ranging sensor 12 on the mounting plate 34 to extend toward the end close to the guide plate 20, thereby ensuring that even if the size of the acrylic sheet to be measured changes, the first laser ranging sensor 12 can always emit laser to the top of the workbench 11 to achieve distance measurement.

[0085] The working principle of the present invention is as follows: when performing rapid multi-point measurement of the thickness of an acrylic sheet, firstly, the acrylic sheet is placed on the top of the workbench 11, and the four clamping plates 48 are used to perform four-point positioning of the acrylic sheet to prevent the scraper from driving the sponge brush 19 to move the acrylic sheet when cleaning the acrylic sheet and thus affecting the thickness measurement effect. The sliding bar 49 can make the clamping plate 48 slide longitudinally, and the telescopic spring 50 can press against the edge of the acrylic sheet when the clamping plate 48 finishes sliding, thereby meeting the positioning requirements of sheets of different sizes, thereby improving the flexibility of the system.

[0086] When the acrylic sheet is positioned, the dual-axis cylinder 23 is started by the controller, so that its output end drops vertically. Since its output end is fixedly connected to the lifting plate 13 through the push plate 24, the three second laser ranging sensors 14 at the bottom of the lifting plate 13 are driven to drop vertically, that is, move toward the acrylic sheet to the standard measurement distance.

[0087] When the three second laser distance measuring sensors 14 move toward the acrylic sheet to the standard measuring distance, the first laser distance measuring sensor 12 and the three second laser distance measuring sensors 14 are started by the controller. The first laser distance measuring sensor 12 directly emits laser to the workbench 11 to measure the distance, and this distance is set as A. The three second laser distance measuring sensors 14 directly send laser to the top of the acrylic sheet to measure the distance, and this distance is set as B. The distance A minus the distance B is the thickness of the acrylic sheet. By designing three second laser distance measuring sensors 14, and the three second laser distance measuring sensors 14 mainly measure the middle area of ​​the acrylic sheet The three measured thicknesses are averaged to reduce the measurement error, and the accurate thickness measurement value of the acrylic sheet can be obtained, so as to achieve the multi-directional measurement effect of the acrylic sheet. It should be noted that when the length and width of the acrylic sheet change, the electric push rod 33 is started by the controller, so that its output end drives the mounting plate 34 to extend toward the end close to the guide plate 20, thereby driving the first laser ranging sensor 12 on the mounting plate 34 to extend toward the end close to the guide plate 20, which can ensure that even if the size of the acrylic sheet to be measured changes, the first laser ranging sensor 12 can always emit laser to the top of the workbench 11 to achieve ranging.

[0088] While the lifting plate 13 drives the first laser ranging sensor 12 and the three second ranging sensors to descend vertically, since the lifting plate 13 and the pull rope 36 are respectively fixedly connected to the two ends of the lifting rod 35, the end of the pull rope 36 away from the lifting rod 35 is fixedly connected to the slide bar 40 through the pull block 37, and the slide bar 40 is slidably connected to the two limit blocks 42. Under the limiting action of the limit wheel 39, the lifting rod 35 drives the pull block 37 to slide toward the end away from the limit block 42 through the pull rope 36, thereby driving the slide bar 40 to slide between the two limit blocks 42 toward the end close to the limit wheel 39 through the pull block 37. In this process, the reset spring 41 changes from the initial state to the tensioned state.

[0089] When the pull block 37 drives the sliding rod 40 to slide between the two limit blocks 42 toward one end close to the limit wheel 39, since the swing rod 43 is rotatably connected to the limit plate 45 through the rotating shaft 44, the limit plate 45 is fixedly connected to the support rod, the second plug rod 38 is plugged into one of the slots 46 at the top of the swing rod 43, the first plug rod 22 is plugged into the other slot 46 at the bottom of the swing rod 43, and the slide plate 18 is slidably connected to the two guide grooves 21 on the two guide plates 20 through the two first plug rods 22, and then the second plug rod 38 pulls the slot 46 at the top of the swing rod 43, so that the swing rod 43 rotates, thereby driving one of the second plug rods 38 to slide through the slot 46 at the bottom of the swing rod 43, and then the sponge brush 19 at the bottom of the slide plate 18 cleans the top surface of the acrylic sheet to be inspected, thereby achieving a cleaning effect, preventing impurities on the top surface of the acrylic sheet from affecting the laser irradiation effect and affecting the measurement effect.

[0090] The avoidance groove 51 provides an avoidance space for the workbench 11 and the swing rod 43 when the swing rod 43 rotates, so as to prevent the swing rod 43 from colliding with the workbench 11 when rotating.

[0091] When the size of the acrylic sheet to be measured changes, mainly when the length and width change, the stepper motor 25 is started by the controller, so that its output end drives the turntable 26 to rotate. Since the turntable 26 and a push block 28 are respectively connected to the two ends of each connecting rod 27, each push block 28 is slidably connected to the two slide rails 30 through two second sliders 29, and each second ranging sensor is fixedly connected to the bottom of a push block 28, thereby driving the two second laser ranging sensors 14 on both sides to move away from each other, so as to adjust the spacing between the three second laser ranging sensors 14, meet the multi-point accurate measurement requirements of acrylic sheets of different sizes, and improve the flexibility of the measurement system.

[0092] While the two second laser ranging sensors 14 on both sides slide, since each indicator rod 31 is fixedly connected to a push block 28, the top of the drop plate is symmetrically designed with two scale values ​​32, and each indicator rod 31 faces a scale value 32, so that the sliding distance of the two second laser ranging sensors 14 on both sides can be accurately adjusted, that is, the spacing between the three second laser ranging sensors 14 can be accurately adjusted, thereby improving the accuracy of multi-point measurement of the thickness of the acrylic sheet.

Claims

1. A rapid multi-point measurement system for the thickness of an acrylic sheet, comprising a workbench (11), wherein two supporting legs are fixedly provided at the bottom of the workbench (11), characterized in that: It also includes a controller, a detection mechanism, a cleaning mechanism and a positioning mechanism; The detection mechanism is arranged on the top of the workbench (11), and comprises a first laser distance measuring sensor (12), a lifting plate (13), an adjustment component, a drive component and three second laser distance measuring sensors (14); a support plate (15) is fixedly arranged on the top of the workbench (11); two guide rails (16) are fixedly arranged on the outer wall of the support plate (15); a first slider (17) is slidably arranged on the outer wall of each guide rail (16); the lifting plate (13) is fixedly arranged between the two first sliders (17); the drive component is arranged on the support plate (15); the adjustment component is arranged on the lifting plate (13); the three second laser distance measuring sensors (14) are respectively arranged on the bottom of the lifting plate (13) and on the adjustment component; and the first laser distance measuring sensor (12) is arranged on the top of the lifting plate (13); The cleaning mechanism is arranged on the top of the workbench (11), and comprises a slide plate (18), a sponge brush (19), two traction assemblies and two swing assemblies. Two guide plates (20) are symmetrically arranged on the top of the workbench (11), and a guide groove (21) is arranged on the outer wall of each guide plate (20). The slide plate (18) is slidably arranged between the two guide grooves (21) through two first insertion rods (22). The sponge brush (19) is inserted at the bottom of the slide plate (18). The two swing assemblies are symmetrically arranged on the top of the workbench (11), and each traction assembly is arranged between one end of the lifting plate (13) and a swing assembly. The positioning mechanism is arranged on the top of the workbench (11), and the first laser distance measuring sensor (12), the adjustment component, the drive component and each second laser distance measuring sensor (14) are all electrically connected to the controller; The driving assembly comprises a double-axis cylinder (23) and a push plate (24); the double-axis cylinder (23) is fixedly arranged on the top of the support plate (15); the push plate (24) is fixedly arranged between its output end and the lifting plate (13); and the double-axis cylinder (23) is electrically connected to the controller; The adjustment component comprises a stepper motor (25), a rotating disk (26), two connecting rods (27), two push blocks (28) and two second sliders (29); a U-shaped plate is fixedly provided on the top of the lifting plate (13); the stepper motor (25) is inserted into the U-shaped plate; the rotating disk (26) is fixedly provided on the output end thereof; four slide rails (30) are symmetrically provided on the top of the lifting plate (13); each second slider (29) is slidably provided on the top of a slide rail (30); each push block (28) is fixedly provided between the tops of two second sliders (29); each connecting rod (27) is hingedly provided between the rotating disk (26) and a push block (28); two second laser distance measuring sensors (14) away from the rotating disk (26) are respectively fixedly provided at the bottoms of the two push blocks (28); and the stepper motor (25) is electrically connected to a controller.

2. The acrylic sheet thickness rapid multi-point measurement system according to claim 1, characterized in that: An indicator rod (31) is fixedly provided on the outer wall of one end of each push block (28), and two scale values ​​(32) are symmetrically provided on the top of the lifting plate (13), and each indicator rod (31) faces one scale value (32).

3. The acrylic sheet thickness rapid multi-point measurement system according to claim 2, characterized in that: An electric push rod (33) is fixedly provided on the top of the lifting plate (13), a mounting plate (34) is fixedly provided on the output end thereof, a first laser distance measuring sensor (12) is fixedly provided on the bottom of the mounting plate (34), and the electric push rod (33) is electrically connected to a controller.

4. The acrylic sheet thickness rapid multi-point measurement system according to claim 3, characterized in that: Each traction assembly comprises a lifting rod (35), a pull rope (36), a pull block (37), a second insertion rod (38), a limiting wheel (39), a sliding rod (40) and a return spring (41); two support rods are fixedly provided on the top of the workbench (11); two limiting blocks (42) are fixedly provided on the top of each support rod; the sliding rod (40) is slidably arranged between the two limiting blocks (42); the pull block (37) is fixedly arranged at one end of the sliding rod (40); and the second insertion rod (38) is fixedly arranged at the top of the workbench (11). The pull rope (36) is fixed between an end of the pull block (37) away from the slide bar (40) and an end of the lift bar (35) away from the top of the lift plate (13). The limit wheel (39) is rotatably arranged on the top of the support plate (15) through an L-shaped rod, and the outer wall of the pull rope (36) is in contact with the outer edge of the limit wheel (39).

5. The acrylic sheet thickness rapid multi-point measurement system according to claim 4, characterized in that: Each swing assembly comprises a swing rod (43), a rotating shaft (44) and a limiting plate (45); the limiting plate (45) is fixedly arranged on the outer wall of one of the support rods; the rotating shaft (44) is rotatably arranged on the limiting plate (45); the swing rod (43) is fixedly arranged at one end of the rotating shaft (44) away from the limiting plate (45); two slots (46) are provided at both ends of the swing rod (43); the first plug rod (22) and the second plug rod (38) are respectively plugged into the two slots (46).

6. The acrylic sheet thickness rapid multi-point measurement system according to claim 5, characterized in that: The positioning mechanism comprises four slide grooves (47) and four abutting components. The four slide grooves (47) are symmetrically arranged on the top of the workbench (11). Each abutting component comprises a clamping plate (48), a slide bar (49) and a telescopic spring (50). Each slide bar (49) is slidably arranged inside a slide groove (47). Each clamping plate (48) is fixedly arranged on the top of a slide bar (49). The inner wall of each slide groove (47) and the outer wall of each slide bar (49) are respectively fixedly connected to the two ends of a telescopic spring (50).

7. The acrylic sheet thickness rapid multi-point measurement system according to claim 6, characterized in that: Two avoidance grooves (51) are symmetrically arranged on the top of the workbench (11).

8. A method for measuring the thickness of acrylic sheet by a rapid multi-point measurement system, comprising the following steps: S1: Positioning of acrylic sheet: The acrylic sheet is placed on the top of the workbench (11), and the acrylic sheet is positioned at four points by four clamping plates (48) to prevent the scraper from driving the sponge brush (19) to move the acrylic sheet when cleaning the acrylic sheet, thereby affecting the thickness measurement effect. The slide bar (49) can make the clamping plate (48) slide longitudinally, and the telescopic spring (50) can press the edge of the acrylic sheet tightly when the clamping plate (48) slides. S2: Rapid multi-point detection of acrylic sheet thickness: After the acrylic sheet is positioned, the controller starts the dual-axis cylinder (23), so that its output end is vertically lowered. Since its output end is fixedly connected to the lifting plate (13) through the push plate (24), the three second laser distance measuring sensors (14) at the bottom of the lifting plate (13) are driven to vertically lower, that is, move toward the acrylic sheet to the standard measurement distance. When the three second laser distance measuring sensors (14) move toward the acrylic plate to a standard measurement distance, the first laser distance measuring sensor (12) and the three second laser distance measuring sensors (14) are started by the controller, the first laser distance measuring sensor (12) directly emits laser light to the workbench (11) to measure the distance, the distance being set as A, and the three second laser distance measuring sensors (14) directly emit laser light to the top of the acrylic plate to measure the distance, the distance being set as B, and the thickness of the acrylic plate is obtained by subtracting the distance B from the distance A. By designing the three second laser distance measuring sensors (14), and the three second laser distance measuring sensors (14) mainly measure the middle area of ​​the acrylic plate, the three measured thicknesses are averaged, the measurement error is reduced, and an accurate thickness measurement value of the acrylic plate can be obtained. S3: Synchronous cleaning of acrylic sheet thickness measurement: While the lifting plate (13) drives the first laser distance measuring sensor (12) and the three second distance measuring sensors to descend vertically, the lifting plate (13) and the pull rope (36) are respectively fixedly connected to the two ends of the lifting rod (35), and the end of the pull rope (36) away from the lifting rod (35) is fixedly connected to the slide bar (40) through the pull block (37), and the slide bar (40) is slidably connected to the two limit blocks (42). Under the limiting action of the limit wheel (39), the lifting rod (35) drives the pull block (37) to slide toward the end away from the limit block (42) through the pull rope (36), thereby driving the slide bar (40) to slide between the two limit blocks (42) toward the end close to the limit wheel (39) through the pull block (37). During this process, the return spring (41) changes from an initial state to a tensioned state. When the pull block (37) drives the slide bar (40) to slide between the two limit blocks (42) toward one end close to the limit wheel (39), the swing bar (43) is rotatably connected to the limit plate (45) through the rotating shaft (44), the limit plate (45) is fixedly connected to the support bar, the second plug rod (38) is plugged into one of the slots (46) at the top of the swing bar (43), the first plug rod (22) is plugged into the other slot (46) at the bottom of the swing bar (43), and the slide plate (18) is connected to the two guide wheels through the two first plug rods (22). The slide plate (20) is slidably connected to the two guide grooves (21) on the slide plate (20), and then the slot (46) at the top of the swing rod (43) is pulled by the second insertion rod (38), so that the swing rod (43) rotates, thereby driving one of the second insertion rods (38) to slide through the slot (46) at the bottom of the swing rod (43), and then the sponge brush (19) at the bottom of the slide plate (18) cleans the top surface of the acrylic plate to be tested, thereby achieving a cleaning effect, preventing impurities on the top surface of the acrylic plate from affecting the laser irradiation effect and thus affecting the measurement effect. S4: Thickness adjustment of acrylic sheets of different sizes: When the size of the acrylic sheet to be measured changes, mainly when the length and width change, the stepper motor (25) is started by the controller, so that its output end drives the turntable (26) to rotate. Since the turntable (26) and a push block (28) are respectively connected to the two ends of each connecting rod (27), each push block (28) is slidably connected to two slide rails (30) through two second sliding blocks (29), and each second distance measuring sensor is fixedly connected to the bottom of a push block (28), thereby driving the two second laser distance measuring sensors (14) located on both sides to move away from each other, so as to adjust the spacing between the three second laser distance measuring sensors (14) to meet the multi-point accurate measurement requirements of acrylic sheets of different sizes. While the two second laser distance measuring sensors (14) located on both sides slide, since each indicator rod (31) is fixedly connected to a push block (28), the top of the drop plate is symmetrically designed with two scale values ​​(32), and each indicator rod (31) faces a scale value (32), thereby accurately adjusting the sliding distance of the two second laser distance measuring sensors (14) located on both sides, that is, accurately adjusting the spacing between the three second laser distance measuring sensors (14). When the length and width of the acrylic sheet changes, the controller activates the electric push rod (33), so that its output end drives the mounting plate (34) to extend toward the end close to the guide plate (20), thereby driving the first laser distance measuring sensor (12) on the mounting plate (34) to extend toward the end close to the guide plate (20), thereby ensuring that even if the size of the acrylic sheet to be measured changes, the first laser distance measuring sensor (12) can always emit laser light toward the top of the workbench (11) to achieve distance measurement.

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