A laser device for measuring the density of a sponge

Abstract

The application relates to the technical field of laser detection, and discloses a laser device for measuring the density of a sponge, which comprises a body, a laser for emitting detection light, a diffraction assembly for diffracting a single beam of light emitted by the laser into a plurality of beams of light, a detection table for placing the sponge, and a movement assembly for controlling the circular movement of the detection table, so that the sponge is subjected to movement detection by the light emitted by the laser. The laser device for measuring the density of a sponge can diffract a plurality of beams of light emitted by the laser through the diffraction assembly, the plurality of beams of light can act on the surface of the sponge to perform laser detection of the roughness of the surface, single irradiation can be directly realized, the detection of multiple surfaces of the sponge can be realized, the detection efficiency of the entire sponge is improved from the side, the sponge cannot be turned over multiple times, one laser source is used in the entire process, the input of light source elements is reduced, the cost input is reduced, the volume is reduced, and multiple detection directions can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser detection, in particular to a laser measuring device for sponge density. BACKGROUND

[0002] At present, after some hard sponge is produced, the roughness of its surface needs to be randomly sampled to avoid the roughness not meeting the standard. At present, the roughness detection method generally adopts physical detection and optical detection. The physical detection directly uses a probe to slide on the surface of the workpiece to detect the roughness of the sponge according to the fluctuation degree of the probe.

[0003] The optical detection uses a laser beam to irradiate the rough surface, and the light will be scattered to form a specific angle distribution. The rougher the surface, the wider the angle distribution of the scattered light; the smoother, the more concentrated, so by measuring the intensity distribution of the scattered light (such as the ratio of the specular reflection peak and the diffuse reflection component), the root mean square roughness (Rq) or the arithmetic average roughness (Ra) of the surface can be calculated.

[0004] However, the laser detection has certain defects. For example, the light is point-shaped, and the operator needs to continuously control the movement of the sponge to make the light move on the sponge, and then detect the transverse position of the sponge. Therefore, the operation process is too cumbersome, and the current laser detection is one-way light emission detection. If bidirectional or multi-directional detection is realized, multiple laser detection devices need to be used to emit multiple light beams, which causes the problem of high procurement cost of the equipment. Therefore, the laser measuring device for sponge density is proposed to solve the above problems. SUMMARY

[0005] (I) Technical problems solved

[0006] In view of the defects of the prior art, the present application provides a laser measuring device for sponge density, which solves the problems of the prior art that the roughness detection of the sponge is not flexible enough, the operation is too cumbersome, the detection efficiency is too low, and the dense detection cannot be realized accurately.

[0007] (II) Technical solutions

[0008] To achieve the above purpose, the present application provides the following technical solutions: a laser measuring device for sponge density, comprising a machine body; a laser for emitting detection light; a diffraction assembly for diffracting a single beam of light emitted by the laser into a bundle of light; a detection table for placing a sponge; a movement assembly for controlling the circular motion of the detection table, and then using the light emitted by the laser to detect the motion of the sponge; the diffraction assembly comprises a diffraction grating, a lens one, a lens two and a lens three, and the lens one, the lens two and the lens three are connected in series on the machine body by iron wires.

[0009] The light emitted by the laser passes through the diffraction grating and is dispersed into two beams of light, which are reflected by the first lens, the second lens and the third lens on the two side surfaces of the sponge.

[0010] Preferably, the detection table comprises a lifting table, a sliding column is fixedly connected to the lifting table, a horizontal moving table is slidably connected to the surface of the sliding column, and the horizontal moving table is connected with a movement assembly.

[0011] Preferably, the movement assembly comprises a horizontal moving assembly and a lifting assembly; the horizontal moving assembly comprises a driving motor, the driving motor is arranged in the body, a driving shaft is connected to the output shaft of the driving motor, a crank is fixedly connected to the driving shaft, a sliding pin is connected to the crank, a connecting frame is fixedly connected to the side surface of the horizontal moving table, a sliding groove is arranged in the connecting frame, the sliding pin is slidably connected in the sliding groove, a sliding tube is fixedly connected to the body, and the horizontal moving table is slidably connected with the sliding tube.

[0012] Preferably, the lifting assembly comprises a double-toothed plate, a moving frame is fixedly connected to the bottom of the double-toothed plate, small gears are engaged on the two sides of the double-toothed plate, a first connecting rod is fixedly connected to the small gears, a second connecting rod is rotatably connected to the first connecting rod, a sliding shaft is slidably connected to the second connecting rod, one end of the sliding shaft is fixedly connected to the lifting table, the small gears are slidably connected with the horizontal moving table through the first and second connecting rods, and a pressing device and a clamping device are arranged on the moving frame.

[0013] Preferably, the pressing device comprises a pressing head, pressing frames are arranged on the two sides of the pressing head, pressing surfaces are formed in the two sides of the pressing frames, a limiting rod is slidably connected to the pressing frame, a fixing frame is connected to the bottom of the limiting rod, the fixing frame is mounted on the body, a pressing plate is slidably connected to the pressing frame, the pressing plate is elastically connected with the pressing frame through a clearance spring, and a ratchet is formed in the moving frame.

[0014] Preferably, the moving frame is slidably connected with the limiting rod through a connecting piece, a reset spring is arranged below the pressing frame, and the reset spring is sleeved on the limiting rod.

[0015] Preferably, the clamping device comprises a top head, the top head is slidably connected with the fixing frame through a connecting rod, the top head is elastically connected with the fixing frame through a pressing spring, a clamping groove is formed in the moving frame, and the top head abuts in the clamping groove.

[0016] Preferably, the clamping device comprises two groups, the two groups of clamping devices are symmetrically distributed with the center line of the moving frame as the axis of symmetry, and the end surface of the top head is triangular.

[0017] Preferably, a mark line is arranged on the detection table, a strip-shaped groove is formed in the surface of the detection table, and the detection table is in a horizontal state.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, the present invention provides a laser measurement device for sponge density, which has the following advantages:

[0020] 1. This laser measurement device for sponge density, through its diffraction component, can diffract the light emitted by the laser into two beams or multiple beams as needed, which then act on the surface of the sponge to perform laser roughness detection. It can directly achieve single-time irradiation and detect multiple sides of the sponge, thereby improving the overall detection efficiency of the sponge. It eliminates the need for multiple flipping, and the entire process uses a single laser source, which reduces the investment in light source components and costs. It also reduces the size while improving the detection in multiple directions.

[0021] 2. This laser measurement device for sponge density, through its motion components, enables lateral movement and intermittent lifting of the sponge, allowing the laser to move and detect the sponge, thus improving the accuracy of sponge detection. Furthermore, the entire process is automated with cyclic swinging and cyclic lifting, eliminating the need for operator intervention and enhancing the convenience of sponge detection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a laser measurement device for sponge density proposed in this invention;

[0023] Figure 2 This is a schematic diagram of a diffraction component structure for a laser measurement device for sponge density proposed in this invention;

[0024] Figure 3 This is a simplified schematic diagram of the light direction of a diffraction component for a laser measurement device for sponge density proposed in this invention.

[0025] Figure 4 This is a schematic diagram of the transverse displacement component structure for a laser measurement device for sponge density proposed in this invention;

[0026] Figure 5 This is a schematic diagram of the rising component structure of a laser measurement device for sponge density proposed in this invention;

[0027] Figure 6 This is a schematic diagram of the connection structure of a pressure frame for a laser measurement device for sponge density proposed in this invention;

[0028] Figure 7 This is a schematic diagram of a positioning device for a laser measurement device for sponge density proposed in this invention;

[0029] Figure 8 This is a schematic diagram of a movable frame structure for a laser measurement device for sponge density proposed in this invention;

[0030] Figure 9 This is a schematic diagram of the surface laser path of the sponge proposed in this invention.

[0031] In the diagram: 1. Main body; 2. Laser; 3. Diffraction assembly; 31. Diffraction grating; 32. Lens 1; 33. Lens 2; 34. Lens 3; 4. Detection stage; 401. Lifting stage; 402. Transverse stage; 403. Sliding column; 5. Motion assembly; 501. Drive shaft; 502. Crank; 503. Sliding pin; 504. Connecting frame; 505. Pressure head; 506. Sliding tube; 507. Moving frame; 508. Double toothed plate; 509. Pinion; 510. Connecting rod 1; 511. Connecting rod 2; 512. Sliding shaft; 513. Slot; 514. Pressure frame; 515. Pressure contact surface; 516. Limiting rod; 517. Return spring; 518. Fixing frame; 519. Top head; 520. Compression spring; 521. Pressure plate; 522. Yield spring; 523. Ratchet. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-9 A laser density measurement device for sponges includes a body 1; a laser 2 for emitting detection light; a diffraction component 3 for diffracting the single beam of light emitted by the laser 2 into a beam of light; a detection stage 4 for placing the sponge; and a motion component 5 for controlling the cyclical movement of the detection stage 4, thereby using the light emitted by the laser 2 to detect the movement of the sponge. The detection stage 4 has marking lines and striped grooves on its surface, and is horizontal. The operator can center the sponge's position based on the marking lines on the detection stage 4, thus providing a positional reference.

[0034] In this embodiment, the diffraction assembly 3 includes a diffraction grating 31, a first lens 32, a second lens 33, and a third lens 34. The first lens 32, the second lens 33, and the third lens 34 are connected in series on the body 1 via wire. The light emitted by the laser 2 passes through the diffraction grating 31 and is dispersed into two beams. These beams are reflected by the first lens 32, the second lens 33, and the third lens 34 onto the two sides of the sponge. When the laser 2 emits laser light, it passes through the diffraction grating 31 and diffracts into two beams. One beam, after diffraction, illuminates the first lens 32, is reflected, and then illuminates the second lens 33, ultimately reflecting onto the right side of the sponge on the inspection stage 4. The other beam illuminates the third lens 34 and, through reflection, acts on the left side of the workpiece. Therefore, both sides of the sponge are autonomously irradiated by the laser, thus enabling simultaneous bilateral roughness detection of the sponge. This improves the overall detection efficiency of the sponge from the side, as it cannot be flipped multiple times. Furthermore, the entire process uses a single laser source, which reduces the investment in light source components and costs. It also reduces the size of the sponge while improving detection in multiple directions.

[0035] Furthermore, the testing platform 4 includes a rising platform 401, on which a sliding column 403 is fixedly connected. A transverse platform 402 is slidably connected to the surface of the sliding column 403, and the transverse platform 402 is connected to the motion component 5. By dividing the testing platform 4 into the rising platform 401 and the transverse platform 402, it is possible to control the split movement of the testing platform 4 in the future, with one moving laterally and the other rising, thereby performing motion roughness detection on the sponge placed on the testing platform 4.

[0036] Furthermore, the motion component 5 includes a lateral movement component and an upward movement component; the lateral movement component includes a drive motor, which is located inside the machine body 1. A drive shaft 501 is connected to the output shaft of the drive motor, a crank 502 is fixedly connected to the drive shaft 501, a sliding pin 503 is connected to the crank 502, a connecting frame 504 is fixedly connected to the side of the lateral movement stage 402, a sliding groove is provided inside the connecting frame 504, the sliding pin 503 is slidably connected inside the sliding groove, a sliding tube 506 is fixedly connected to the machine body 1, and the lateral movement stage 402 is slidably connected to the sliding tube 506. When the drive motor inside the machine body 1 rotates, it will drive the drive shaft 501 to rotate, which in turn drives the crank 502 to rotate. The crank 502 will then drive the sliding pin 503 to slide in the groove inside the connecting frame 504, thereby causing the connecting frame 504 to swing back and forth in a cycle. The connecting frame 504 will then synchronously drive the transverse stage 402 to move back and forth in a cycle. The transverse stage 402 will then drive the sponge on the rising stage 401 to move laterally through the plug-in connection of the sliding column 403. Therefore, the sponge moves back and forth in a cycle, realizing the "point to line" type of transverse movement detection, thereby automatically and cyclically detecting the linear area of ​​the sponge.

[0037] In addition, the lifting assembly includes a double toothed plate 508, a movable frame 507 fixedly connected to the bottom of the double toothed plate 508, small gears 509 meshing on both sides of the double toothed plate 508, a connecting rod 510 fixedly connected to the small gear 509, a connecting rod 511 rotatably connected to the connecting rod 510, a sliding shaft 512 slidably connected to the connecting rod 511, one end of the sliding shaft 512 fixedly connected to the lifting platform 401, the axis of the small gear 509 slidably connected to the transverse platform 402 through the connecting rod, and a pressing device and a locking device are provided on the movable frame 507. When the connecting frame 504 moves to its left and right limit positions, it will cause the pressure head 505 to come into contact with the pressure contact surface 515 on the pressure frame 514. This contact will then cause the pressure frame 514 to move downwards a short distance. The pressure frame 514 will then simultaneously move the pressure plate 521 downwards. The pressure plate 521 and the ratchet 523 inside the moving frame 507 are in a one-way engagement. At this point, the pressure plate 521 presses against the ratchet 523, causing the moving frame 507 to move downwards a short distance. After the moving frame 507 moves downwards, it will simultaneously move the double-toothed plate 508 downwards. Then, by utilizing the meshing of gears, two small gears 509 are driven to rotate relative to each other. The rotation of small gears 509 will cause connecting rod 1 510 and connecting rod 2 511 to unfold. Connecting rod 2 511 will then drive the lifting platform 401 to rise a small distance through the connection of sliding shaft 512. At this time, the sponge will rise to a certain height, while the position of the light remains unchanged. Therefore, by controlling the lifting of the workpiece, roughness detection can be performed on the side of the workpiece under different height differences. No manual operation by the operator is required, and autonomous "S-shaped" linear path detection is directly realized.

[0038] In addition, the pressure contact device includes a pressure head 505, pressure frames 514 are provided on both sides of the pressure head 505, pressure contact surfaces 515 are provided on both sides of the pressure frame 514, a limit rod 516 is slidably connected on the pressure frame 514, a fixed frame 518 is connected to the bottom of the limit rod 516, the fixed frame 518 is installed on the machine body 1, a pressure plate 521 is slidably connected on the pressure frame 514, the pressure plate 521 is elastically connected to the pressure frame 514 through a relief spring 522, and a ratchet 523 is provided inside the movable frame 507. The ratchet 523, when the pressure plate 521 moves downward, engages to move the movable frame 507 downward. When the pressure plate 521 moves upward, it is aligned with the ratchet 523. At this time, the return spring 517 below synchronously pushes the pressure frame 514 upward to reset. The pressure plate 521 then compresses the relief spring 522, retracting and repositioning, thus restoring the entire pressure frame 514 to its initial height, preparing it for the downward movement of the pressure head 505 in the next cycle. The movable frame 507 is slidably connected to the limiting rod 516 via a connector. The return spring 517 is located below the pressure frame 514 and is sleeved on the limiting rod 516. By sliding the movable frame 507 against the limiting rod 516, the movement of the movable frame 507 is restricted to vertical movement, making the overall movement more stable and smooth.

[0039] It is worth noting that the positioning device includes a top head 519, which is slidably connected to the fixed frame 518 via a connecting rod. The top head 519 is elastically connected to the fixed frame 518 via a compression spring 520. A slot 513 is provided on the movable frame 507, and the top head 519 abuts against the slot 513. Two sets of positioning devices are provided, and the two sets of positioning devices are symmetrically distributed about the center line of the movable frame 507 as the axis of symmetry. The end face of the top head 519 is triangular. The positioning device can initially position the movable frame 507. By using the elastic force of the two compression springs 520, the top head 519 will be fixed in the slot 513 of the movable frame 507, preventing the movable frame 507 from sliding down due to gravity. Therefore, each time it moves down a certain distance, the top head 519, using its triangular inclined surface, slides into the slot 513 at different heights, thus achieving the initial positioning of the movable frame 507.

[0040] The working principle is as follows: First, the operator needs to center the sponge according to the scale line on the testing platform 4. Then, the laser 2 is turned on. The machine body 1 also contains several electrical components. In essence, the machine body 1, its internal parts, and the laser 2 constitute a laser roughness testing instrument. When the laser 2 emits laser light, it passes through the diffraction grating 31, which is a type of grating. Through its regular structure, it periodically spatially modulates the amplitude or phase, or both, of the incident light. The most important application of diffraction gratings in optics is as a beam splitter. Therefore, after the laser light passes through the diffraction grating 31, it will be dispersed into two beams. The specific number of beams to be split depends on the actual needs of selecting different types of diffraction gratings 31. This technical solution uses two diffraction beams. One beam, after diffraction, will illuminate the first lens 32, and after reflection, illuminate the second lens 33, and finally reflect onto the right side of the sponge on the inspection stage 4. The other beam will illuminate the third lens 34, and through the principle of reflection, act on the left side of the workpiece. Therefore, both sides of the sponge are autonomously illuminated by the laser, thereby performing simultaneous roughness detection on both sides of the sponge. Because the laser irradiation on the sponge is point-like, the roughness detection has limitations or the detection values ​​may be inaccurate. Therefore, a motion component 5 is set up. The motion component 5 can move the detection stage 4 horizontally and simultaneously perform an upward movement, thereby performing cyclic linear detection of the sponge. Specifically, when the drive motor inside the machine body 1 rotates, it will drive the drive shaft 501 to rotate, which in turn drives the crank 502 to rotate. The crank 502 will then drive the sliding pin 503 to slide in the groove inside the connecting frame 504, thereby causing the connecting frame 504 to swing back and forth in a cyclic manner. The connecting frame 504 will synchronously drive the transverse stage 402 to move back and forth in a cyclic manner. The transverse stage 402 will synchronously drive the sponge on the rising stage 401 to move laterally through the plug-in connection of the sliding column 403. Therefore, the sponge moves back and forth in a cyclic manner, realizing the "point-to-line" lateral movement detection, thereby automatically cyclically detecting the linear area of ​​the sponge.When the connecting frame 504 moves to its left and right limit positions, it will cause the pressure head 505 to come into contact with the pressure contact surface 515 on the pressure frame 514. This contact will then cause the pressure frame 514 to move downwards a short distance. The pressure frame 514 will then simultaneously cause the pressure plate 521 to move downwards. The pressure plate 521 and the ratchet 523 inside the moving frame 507 are in a one-way engagement. At this time, the pressure plate 521 presses against the ratchet 523, causing the moving frame 507 to move downwards a short distance. After the moving frame 507 moves downwards, it will simultaneously cause the double-toothed plate 508 to move downwards. Then, through the meshing of the gears, the two small gears 509 will rotate relative to each other. The rotation of the small gears 509... This will cause connecting rod 1 (510) and connecting rod 2 (511) to unfold. Connecting rod 2 (511) will then drive the lifting platform 401 to rise a small distance via the sliding shaft 512. The position of the transverse platform 402 remains relatively unchanged. Therefore, subsequent movement of the transverse platform 402 will still drive the transverse movement of the lifting platform 401 via the movement of the sliding column 403. When the transverse platform 402 and the lifting platform 401 move transversely simultaneously, they will be slidably connected to connecting rod 2 (511) via the sliding shaft 512, without interfering with the lifting process. The connecting rod connected to the pinion 509 is also slidably connected to the transverse platform 402. Therefore, the transverse movement of the transverse platform 402 will extend and retract into the interior of the transverse platform 402. After the lifting platform 401 has risen a certain distance, when it moves transversely again, it will control a certain distance difference between the sponge and the previous detection height, thereby realizing the "S-shaped" linear motion detection of the sponge. This achieves automation while simultaneously improving the accuracy of the sponge detection values. The positioning device allows for initial positioning of the movable frame 507. The two compression springs 520 push the top head 519 into the slot 513 of the movable frame 507, preventing it from sliding down due to gravity. Each time the frame moves a certain distance downwards, the top head 519, utilizing its triangular inclined surface, slides into the slots 513 at different heights, achieving initial positioning of the movable frame 507. The reset spring 517 automatically rises and resets when the pressure head 505 disengages from the pressure contact surface 515 of the pressure frame 514, preparing for the next downward movement.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A device for laser measurement of sponge density, characterized by, Include: Machine body (1); Laser (2) for emitting detection light; Diffractive component (3) for diffracting single beam of light emitted by laser (2) into beam of light; Detection platform (4) for placing sponge; Motion component (5) for controlling the cyclic motion of detection platform (4), so as to detect the motion of sponge by the light emitted by laser (2); The diffractive component (3) comprises a diffraction grating (31), a lens (32), a lens (33) and a lens (34), the lens (32), the lens (33) and the lens (34) are connected in series on the machine body (1) by iron wire; The light emitted by the laser (2) is dispersed into two beams of light through the diffraction grating (31), and is reflected on the two side surfaces of the sponge through the lens (32), the lens (33) and the lens (34); The detection platform (4) comprises a lifting platform (401), the lifting platform (401) is fixedly connected with a sliding column (403), the surface of the sliding column (403) is slidably connected with a horizontal moving platform (402), and the horizontal moving platform (402) is connected with the motion component (5); The motion component (5) comprises a horizontal moving component and a lifting component; the horizontal moving component comprises a driving motor, the driving motor is arranged in the machine body (1), a driving shaft (501) is connected to the output shaft of the driving motor, a crank (502) is fixedly connected to the driving shaft (501), a sliding pin (503) is connected to the crank (502), a connecting frame (504) is fixedly connected to the side surface of the horizontal moving platform (402), a sliding groove is arranged in the connecting frame (504), the sliding pin (503) is slidably connected in the sliding groove, a sliding pipe (506) is fixedly connected to the machine body (1), and the horizontal moving platform (402) is slidably connected with the sliding pipe (506).

2. A device for laser measurement of the density of a sponge according to claim 1, characterized in that: The lifting component comprises a double-toothed plate (508), the bottom of the double-toothed plate (508) is fixedly connected with a moving frame (507), small gears (509) are engaged on the two sides of the double-toothed plate (508), a connecting rod (510) is fixedly connected to the small gear (509), a connecting rod (511) is rotatably connected to the connecting rod (510), a sliding shaft (512) is slidably connected to the connecting rod (511), one end of the sliding shaft (512) is fixedly connected to the lifting platform (401), the shaft center of the small gear (509) is slidably connected with the horizontal moving platform (402) through a connecting rod, and the moving frame (507) is provided with a pressure contact device and a detent device.

3. A device for laser measurement of sponge density according to claim 2, characterized in that: The pressing device comprises a pressing head (505), both sides of the pressing head (505) are provided with a pressing frame (514), both sides of the pressing frame (514) are provided with a pressing surface (515), a limiting rod (516) is slidably connected to the pressing frame (514), the bottom of the limiting rod (516) is connected with a fixing frame (518), the fixing frame (518) is installed on the machine body (1), a pressing plate (521) is slidably connected to the pressing frame (514), the pressing plate (521) is elastically connected with the pressing frame (514) through a gap spring (522), and the inside of the moving frame (507) is provided with a ratchet (523).

4. A device for laser measurement of the density of a sponge according to claim 3, characterized in that: The moving frame (507) is slidably connected with the limiting rod (516) through a connecting piece, and the bottom of the pressing frame (514) is provided with a reset spring (517), which is sleeved on the limiting rod (516).

5. A device for laser measurement of the density of a sponge according to claim 4, characterized in that: The clamping device comprises a top head (519), the top head (519) is slidably connected with the fixing frame (518) through a connecting rod, the top head (519) is elastically connected with the fixing frame (518) through a pressing spring (520), the moving frame (507) is provided with a clamping groove (513), and the top head (519) abuts in the clamping groove (513).

6. A device for laser measurement of sponge density according to claim 5, characterized in that: The clamping device is provided with two groups, and the two groups of clamping devices are symmetrically distributed with the center line of the moving frame (507) as the axis of symmetry, and the end face of the top head (519) is triangular.

7. A device for laser measurement of density of a sponge according to claim 1, characterized in that: The detection table (4) is provided with a mark line, the surface of the detection table (4) is provided with a strip-shaped groove, and the detection table (4) is in a horizontal state.

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