Fiber board thickness detection device and use method thereof

Abstract

The invention discloses a fiber board thickness detection device and a use method thereof, and relates to the technical field of fiber board thickness detection.The fiber board thickness detection device comprises a workbench, a conveying belt used for horizontally conveying fiber boards is installed in the middle of the workbench, and a digital display controller is installed on one side of the workbench; the laser measuring mechanism is mounted at the top of the workbench, and the laser measuring mechanism measures the thickness of the surface of the plate in a corrugated multi-point trajectory manner; the marking mechanism is mounted at one end of the laser measuring mechanism; the closing mechanism is installed on one side of the laser measuring mechanism. According to the device, the laser measuring mechanism and the marking mechanism are arranged in a matched mode, the laser range finder can conveniently carry out corrugated track multi-point thickness measurement on a plate moving on the conveying belt, the phenomenon that the thickness of the plate is not uniform is reduced, the marking mechanism can mark unqualified products with the non-uniform thickness, and the production efficiency is improved. Qualified plates and unqualified plates can be quickly distinguished, and meanwhile, the plate thickness detection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fiber board thickness detection, and in particular to a fiber board thickness detection device and a use method thereof. Background Art

[0002] Fiberboard is a man-made board made by interweaving wood cellulose fibers and using their inherent adhesive. After absorbing moisture, the fiberboard will warp and deform due to the difference in expansion force. In the production process of extrusion molding of fiberboard, there will be uneven thickness of the board due to uneven extrusion pressure, excessive glue or excessive fibers in some areas.

[0003] The existing fiber board thickness detection is generally carried out through fixed-point detection. For example, a board thickness detection device is disclosed in application No. 202320185181.4, including: a base, a supporting structure, a downward pressure structure, a laser ranging assembly and a control box; the supporting structure, the downward pressure structure and the laser ranging assembly are all arranged on the top of the base; the supporting structure includes a fixed cylinder, an adjusting cylinder and a supporting seat, the fixed cylinder is arranged on the top of the base, the adjusting cylinder is sleeved on the outside of the fixed cylinder, and the supporting seat is arranged on the adjusting cylinder; the downward pressure structure includes a hydraulic rod, an extension frame and a downward pressure ring, the hydraulic rod is arranged on the top of the base, and the extension frame is arranged at the telescopic end of the hydraulic rod.

[0004] The above-mentioned detection device flattens the plate in the detection area through the cooperation of the supporting structure and the downward pressure structure to eliminate the influence of bending and warping on thickness detection. However, during detection, only the thickness of the local side area of ​​the plate can be detected, and the consistency of the thickness in a large range in the middle of the plate cannot be ensured. During detection, the plates need to be placed piece by piece between the supporting structure and the downward pressure structure. The detection efficiency is slow, and it is impossible to quickly distinguish between products with qualified thickness and unqualified products. Summary of the invention

[0005] The object of the present invention is to provide a fiber board thickness detection device and a method of using the same to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a fiber board thickness detection device, comprising: A workbench, wherein a conveyor belt for horizontally transporting fiberboard is installed in the middle of the workbench, and a digital display controller is installed on one side of the workbench; Also includes: A laser measuring mechanism, which is installed on the top of the workbench and measures the thickness of the plate surface in a corrugated multi-point trajectory; A marking mechanism, the marking mechanism is installed at one end of the laser measuring mechanism, and the laser measuring mechanism is used to mark an elliptical circle on the marking mechanism; The closing mechanism is installed on one side of the laser measuring mechanism and is used for stopping the marking mechanism.

[0007] Preferably, the laser measurement mechanism comprises: A fixing assembly, wherein the fixing assembly is fixed to one end of the top of the workbench; A translation assembly, the translation assembly is mounted on the fixed assembly, and the translation assembly is used for horizontally sliding a fixed distance above the conveyor belt; A laser rangefinder, wherein the laser rangefinder is fixed to the bottom of the translation assembly; A driving assembly is installed on one side of the translation assembly, and the marking mechanism and the closing mechanism are both installed on the driving assembly.

[0008] Preferably, the fixing assembly comprises: A fixing rod, the fixing rod is fixedly inserted into the top of the workbench in a horizontal direction; A fixed block is fixed to the end of the top of the workbench, and one end of the fixed rod is fixedly inserted and connected with one side of the fixed block.

[0009] Preferably, the translation assembly comprises: A slider, wherein the slider is slidably connected to the outer wall of the fixing rod, and the laser rangefinder is fixed to the bottom of the slider by screws; A sector-shaped tooth block, wherein the sector-shaped tooth block is meshingly connected with one side of the slider; A positioning shaft, the bottom of which is fixedly inserted into the inner cavity of the sector-shaped gear block, and the top of which is rotatably connected to the top of the workbench through a bearing; The movable frame is fixedly inserted in the middle of the positioning shaft, and the driving component is arranged at one end of the movable frame.

[0010] Preferably, the driving assembly comprises: A support rod, wherein the support rod is fixed to the inner wall of the workbench; A rotating shaft, the rotating shaft is rotatably inserted into one end of the supporting rod through a bearing; A turntable, the turntable is fixedly inserted into the top of the rotating shaft, the bottom of the turntable is connected to the marking mechanism, and the outer wall of the turntable is extruded and connected to the closing mechanism; A positioning pin rod, the positioning pin rod is fixed to the outer side of the upper surface of the rotating disk, and the positioning pin rod is slidably connected with the inner cavity of the movable frame; A servo motor is fixed to the bottom of the support rod through a supporting frame.

[0011] Preferably, the output end of the servo motor is transmission-connected to the bottom of the rotating shaft, and the movable frame is located above the rotating disk in a swinging state through a positioning pin rod.

[0012] Preferably, the marking mechanism comprises: A support frame, wherein the support frame is fixed to the bottom of the turntable by screws; An electric telescopic rod, which is fixedly inserted into the middle of the support frame; A marking component is installed at the telescopic end of the electric telescopic rod.

[0013] Preferably, the marking assembly comprises: A support block, wherein the support block is mounted on the telescopic bottom end of the electric telescopic rod by means of bolts; A card slot, the card slot is provided at one end of the support block; A rubber pad, the rubber pad being fixed to the inner wall of the card slot; A locking bolt, wherein the thread of the locking bolt is inserted into one side of the slot; A first tension spring, wherein the first tension spring is fixed to the top of the support block; A marking pen, the top of which is clamped on the top of the first tension spring, and the marking pen is inserted into the inner cavity of the card slot.

[0014] Preferably, the closing mechanism comprises: A limit frame, wherein the limit frame is fixed to the top of the support rod; A push switch, the push switch is fixed to one end of the limit frame, and the push switch is used to reset and close the electric telescopic rod; A second tension spring, wherein the second tension spring is fixed to the other end of the inner wall of the limiting frame; A push rod is slidably inserted into the other end of the limit frame, one end of the push rod is fixed to one end of the second tension spring through a clamping plate, and the push rod presses the push switch to close through the squeezing of the rotating disk.

[0015] The present invention also provides a method for using the fiber board thickness detection device, comprising the following specific steps: Step 1: The fiberboard is slowly moved horizontally on the conveyor belt. The laser distance meter is started by the digital display controller so that the laser distance meter can measure the thickness of the board. The distance between the laser distance meter and the conveyor belt minus the distance between the laser distance meter and the board is the thickness of the board. At the same time, the servo motor drives the turntable to rotate, so that the positioning pin drives the movable frame to swing, and the fan-shaped tooth block drives the slider to move horizontally. In conjunction with the movement of the conveyor belt on the board, the laser distance meter can perform corrugated track multi-point measurement of the board thickness. Step 2: After the data measured by the laser rangefinder is transmitted to the digital display controller, if the error of the multi-point measurement result is within the specified range, the plate thickness is qualified. The plate continues to move to the other end of the conveyor belt. If the error of the measurement result is not within the specified range, the plate thickness is unqualified. At this time, the digital display controller sends a driving signal to the electric telescopic rod, and the electric telescopic rod drives the marker pen to move to the plate under the turntable and rotates with the turntable, so that the marker pen can mark the plate with an elliptical circle; Step 3: After the turntable drives the marker pen to rotate one circle, the protrusion on the outer wall of the turntable pushes the push rod, so that the push rod presses the push switch, so that the electric telescopic rod is reset and closed, and so on. The next plate can be tested for thickness.

[0016] Technical effects and advantages of the present invention: The present invention utilizes a setting mode in which a laser measuring mechanism and a marking mechanism are matched, and through a digital display controller, the laser rangefinder on the laser measuring mechanism and the electric telescopic rod on the marking mechanism are driven conveniently, so that the laser rangefinder can measure the thickness of the plate moving on the conveyor belt at multiple points along a corrugated track, thereby reducing the uneven thickness of the plate, and the marking mechanism can mark unqualified products with uneven thickness, thereby facilitating the rapid distinction between qualified plates and unqualified plates, and improving the plate thickness detection efficiency at the same time; The present invention utilizes a configuration mode in which a driving component and a translation component are matched, and through the configuration of a positioning pin rod on a turntable and a movable frame, the sector-shaped tooth block can drive a slide block to translate with a positioning axis as the axis, so as to facilitate the horizontal movement of a laser rangefinder on a fixed component, so that the laser rangefinder can perform multi-point measurement on a plate, thereby reducing the phenomenon of inaccurate plate thickness in traditional local measurement; The present invention utilizes a setting mode in which a closing mechanism and a marking mechanism are coordinated, and utilizes a digital display controller to drive the electric telescopic rod. After the turntable drives the marking pen to draw a circle, the turntable pushes the push rod on the marking mechanism so that the push rod presses the push switch, which is convenient for the electric telescopic rod to reset, so that the marking pen will not mark the next plate at will, thereby improving the accuracy and stability of the marking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the overall front structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the top view of the movable frame of the present invention.

[0020] Figure 4 It is a schematic diagram of the side structure of the turntable of the present invention.

[0021] Figure 5 For the present invention Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0022] Figure 6 It is a schematic diagram of the overall structure of the support block of the present invention.

[0023] Figure 7 It is the working flow chart of the control box of the present invention.

[0024] Figure 8 It is a schematic diagram of the measuring points of the fiberboard of the present invention.

[0025] In the figure: 1. workbench; 2. conveyor belt; 3. digital display controller; 4. laser measuring mechanism; 41. fixing assembly; 411. fixing rod; 412. fixing block; 42. translation assembly; 421. slider; 422. sector gear block; 423. positioning shaft; 424. movable frame; 43. laser rangefinder; 44. driving assembly; 441. support rod; 442. rotating shaft; 443. turntable; 444. positioning pin rod; 445. servo motor; 5. marking mechanism; 51. supporting frame; 52. electric telescopic rod; 53. marking assembly; 531. supporting block; 532. card slot; 533. rubber pad; 534. locking bolt; 535. first tension spring; 536. marking pen; 6. closing mechanism; 61. limit frame; 62. push switch; 63. second tension spring; 64. ejector. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The present invention provides Figure 1-8 A fiber board thickness detection device shown in the figure comprises: a workbench 1, a conveyor belt 2 for horizontally transporting fiber boards is installed in the middle of the workbench 1, a digital display controller 3 is installed on one side of the workbench 1, and limit racks are installed on both sides of the conveyor belt 2 to facilitate moving the board on the conveyor belt 2 to the middle of the conveyor belt 2, so that the measurement of the board is more accurate; It also includes: a laser measuring mechanism 4, a marking mechanism 5 and a closing mechanism 6. The laser measuring mechanism 4, the marking mechanism 5 and the closing mechanism 6 are all installed above the conveyor belt 2. The laser measuring mechanism 4 is installed on the top of the workbench 1. The laser measuring mechanism 4 measures the thickness of the plate surface in a corrugated multi-point trajectory.

[0028] Furthermore, the laser measuring mechanism 4 comprises: a fixed component 41, a translation component 42, a laser rangefinder 43 and a driving component 44, wherein the fixed component 41 is fixed to one end of the top of the workbench 1, the translation component 42 is mounted on the fixed component 41, the translation component 42 is used for horizontal fixed distance sliding above the conveyor belt 2, the laser rangefinder 43 is fixed to the bottom of the translation component 42, and the driving component 44 is mounted on one side of the translation component 42. Through the driving component 44, it is convenient to drive the laser rangefinder 43 on the translation component 42 to move in the horizontal direction, so that the laser rangefinder 43 can perform multi-point distance measurement. The laser rangefinder 43 detects the thickness of the plate as the distance between the laser rangefinder 43 and the conveyor belt 2 minus the distance difference between the laser rangefinder 43 and the plate. The laser rangefinder 43 is data-connected with the digital display controller 3, so that the laser rangefinder 43 can be opened and closed by the digital display controller 3, and the data measured by the laser rangefinder 43 can be transmitted to the digital display controller 3 and calculated by the digital display controller 3; Specifically, the fixing assembly 41 includes: two fixing rods 411 and a fixing block 412, the two fixing rods 411 are fixedly inserted in the top of the workbench 1 in a horizontal direction, the fixing block 412 is fixed to the end of the top of the workbench 1, and one end of the fixing rod 411 is fixedly inserted and connected with one side of the fixing block 412; The translation assembly 42 includes: a slider 421, a sector tooth block 422, a positioning shaft 423 and a movable frame 424. The slider 421 is slidably connected to the outer walls of the two fixed rods 411. The fixed rods 411 are used to stabilize the sliding of the slider 421. The laser rangefinder 43 is fixed to the bottom of the slider 421 by screws, so that the laser rangefinder 43 can keep up with the horizontal movement of the slider 421. The sector tooth block 422 is meshed with one side of the slider 421. The bottom of the positioning shaft 423 is fixedly inserted into the sector tooth block 422. The inner cavity of the block 422, the top of the positioning shaft 423 is rotatably connected with the top of the workbench 1 through a bearing, and the movable frame 424 is fixedly inserted in the middle of the positioning shaft 423. Through the setting of the positioning shaft 423, it is convenient to position the sector-shaped tooth block 422 and the movable frame 424, so that the sector-shaped tooth block 422 can rotate with the positioning shaft 423 as the axis, so that the sector-shaped tooth block 422 can mesh and push the slider 421, so that the slider 421 can slide back and forth, and the laser rangefinder 43 can perform reciprocating measurement; In particular, the driving component 44 is arranged at one end of the movable frame 424, and the driving component 44 includes: a support rod 441, a rotating shaft 442, a turntable 443, a positioning pin rod 444 and a servo motor 445. The support rod 441 is fixed to the inner wall of the workbench 1, the rotating shaft 442 is rotatably inserted into one end of the support rod 441 through a bearing, the turntable 443 is fixedly inserted into the top of the rotating shaft 442, the bottom of the turntable 443 is connected to the marking mechanism 5, the outer wall of the turntable 443 is extruded and connected to the closing mechanism 6, the positioning pin rod 444 is fixed to the outer side of the upper surface of the turntable 443, the positioning pin rod 444 is slidably inserted into the inner cavity of the movable frame 424, the servo motor 445 is fixed to the bottom of the support rod 441 through a carrier, the output end of the servo motor 445 is transmission-connected to the bottom of the rotating shaft 442, and the movable frame 424 is located above the turntable 443 in a swinging state through the positioning pin rod 444.

[0029] Further, the marking mechanism 5 is installed at one end of the laser measuring mechanism 4, the marking mechanism 5 and the closing mechanism 6 are both installed on the driving assembly 44, the laser measuring mechanism 4 is used for marking the elliptical circle mark of the marking mechanism 5, and the marking mechanism 5 includes: a support frame 51, an electric telescopic rod 52 and a marking assembly 53, the support frame 51 is fixed to the bottom of the turntable 443 by screws, the electric telescopic rod 52 is fixedly inserted in the middle of the support frame 51, and the marking assembly 53 is installed at the telescopic end of the electric telescopic rod 52, and the opening signal end of the electric telescopic rod 52 is connected to the digital display controller 3, so that when the digital display controller 3 detects that the thickness of different parts of the plate exceeds the specified range, the digital display controller 3 can drive the electric telescopic rod 52 so that the electric telescopic rod 52 can drive the marking assembly 53 to move downward; Specifically, the marking assembly 53 includes: a support block 531, a slot 532, a rubber pad 533, a locking bolt 534, a first tension spring 535 and a marking pen 536. The support block 531 is installed on the telescopic bottom end of the electric telescopic rod 52 by bolts. The slot 532 is opened at one end of the support block 531. The rubber pad 533 is fixed to the inner wall of the slot 532. The locking bolt 534 is threadedly inserted into one side of the slot 532. The first tension spring 535 is fixed to the top of the support block 531. The top of the marking pen 536 is clamped to the top of the first tension spring 535. The marking pen 536 is inserted into the inner cavity of the slot 532. The first tension spring 535 It is sleeved on the top of the marker pen 536, and the locking bolt 534 is set to facilitate the control of the range of movement of the marker pen 536 in the slot 532. It is suitable for the use of marker pens 536 of different models, and the marker pen 536 can only slide in the vertical direction in the inner cavity of the slot 532. The elasticity of the first tension spring 535 can prevent the marker pen 536 and the plate from being excessively squeezed, thereby reducing the squeezing damage to the marker pen 536 and the plate, so that the marker pen 536 can keep up with the electric telescopic rod 52 to rotate in a circle under the turntable 443, and through the movement of the plate, the marker pen 536 can mark the plate with an elliptical circle.

[0030] Furthermore, a closing mechanism 6 is installed on one side of the laser measuring mechanism 4, and the closing mechanism 6 is used to stop the marking mechanism 5. The closing mechanism 6 includes: a limit frame 61, a push switch 62, a second tension spring 63 and a push rod 64. The limit frame 61 is fixed to the top of the support rod 441, and the push switch 62 is fixed to one end of the limit frame 61. The push switch 62 is used to reset and close the electric telescopic rod 52. The push switch 62 is connected to the closing signal end of the electric telescopic rod 52. The second tension spring 63 is fixed to the other end of the inner wall of the limit frame 61, and the push rod 64 slides through the limit frame 61. At the other end of the positioning frame 61, one end of the push rod 64 is fixed to one end of the second tension spring 63 through a clamping plate. The push rod 64 presses and closes the push switch 62 by squeezing the turntable 443. Through the protruding structure on the outer wall of the turntable 443, when the turntable 443 rotates clockwise, the turntable 443 rotates one circle to press the push switch 62, and the push switch 62 can only turn off the electric telescopic rod 52, that is, the push switch 62 can be pressed repeatedly, so that the extension and retraction of the electric telescopic rod 52 is stable, thereby improving the stability of marking defective products during plate thickness detection.

[0031] Method of use of the present invention: The fiber board moves slowly horizontally on the conveyor belt 2. The laser distance meter 43 is started by the digital display controller 3 so that the laser distance meter 43 can measure the thickness of the board. The distance between the laser distance meter 43 and the conveyor belt 2 minus the distance between the laser distance meter 43 and the board is the thickness of the board. At the same time, the servo motor 445 drives the turntable 443 to rotate, so that the positioning pin rod 444 drives the movable frame 424 to swing, so that the fan-shaped tooth block 422 drives the slider 421 to move horizontally, and cooperates with the conveyor belt 2 to move the board, so that the laser distance meter 43 can perform corrugated track multi-point measurement of the thickness of the board. After the data measured by the laser rangefinder 43 is transmitted to the digital display controller 3, if the error of the multi-point measurement result is within the specified range, the thickness of the plate is qualified. The plate continues to move to the other end of the conveyor belt. If the error of the measurement result is not within the specified range, the thickness of the plate is unqualified. At this time, the digital display controller 3 sends a driving signal to the electric telescopic rod 52, and the electric telescopic rod 52 drives the marking pen 536 to move to the plate under the turntable 443 and rotate with the turntable 443, so that the marking pen 536 can mark the plate with an elliptical circle. After the turntable 443 drives the marking pen 536 to rotate one circle, the protrusion on the outer wall of the turntable 443 pushes the push rod 64, so that the push rod 64 presses the push switch 62, so that the electric telescopic rod 52 is reset and closed, and so on, the next plate can be tested for thickness.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fiber board thickness detection device, comprising: A workbench (1), wherein a conveyor belt (2) for horizontally transporting fiberboard is installed in the middle of the workbench (1), and a digital display controller (3) is installed on one side of the workbench (1); It is characterized by further comprising: A laser measuring mechanism (4), the laser measuring mechanism (4) being mounted on the top of the workbench (1), and the laser measuring mechanism (4) measuring the thickness of the plate surface in a corrugated multi-point trajectory; A marking mechanism (5), the marking mechanism (5) being mounted on one end of the laser measuring mechanism (4), the laser measuring mechanism (4) being used to mark an elliptical circle of the marking mechanism (5); A closing mechanism (6) is installed on one side of the laser measuring mechanism (4), and the closing mechanism (6) is used to stop the marking mechanism (5).

2. A fiber board thickness detection device according to claim 1, characterized in that: The laser measurement mechanism (4) comprises: A fixing component (41), wherein the fixing component (41) is fixed to one end of the top of the workbench (1); A translation assembly (42), the translation assembly (42) being mounted on the fixed assembly (41), the translation assembly (42) being used for horizontally sliding a fixed distance above the conveyor belt (2); A laser rangefinder (43), wherein the laser rangefinder (43) is fixed to the bottom of the translation assembly (42); A driving assembly (44), wherein the driving assembly (44) is mounted on one side of the translation assembly (42), and the marking mechanism (5) and the closing mechanism (6) are both mounted on the driving assembly (44).

3. A fiberboard thickness detection device according to claim 2, characterized in that: The fixing assembly (41) comprises: A fixing rod (411), wherein the fixing rod (411) is fixedly inserted into the top of the workbench (1) in a horizontal direction; A fixed block (412) is fixed to the end of the top of the workbench (1), and one end of the fixed rod (411) is fixedly connected to one side of the fixed block (412).

4. A fiber board thickness detection device according to claim 3, characterized in that: The translation assembly (42) comprises: A slider (421), the slider (421) being slidably connected to the outer wall of the fixing rod (411), and the laser rangefinder (43) being fixed to the bottom of the slider (421) by means of screws; A sector-shaped tooth block (422), wherein the sector-shaped tooth block (422) is meshingly connected with one side of the slider (421); A positioning shaft (423), wherein the bottom of the positioning shaft (423) is fixedly inserted into the inner cavity of the sector-shaped gear block (422), and the top of the positioning shaft (423) is rotatably connected to the top of the workbench (1) via a bearing; A movable frame (424), the movable frame (424) is fixedly inserted into the middle of the positioning shaft (423), and the driving component (44) is arranged at one end of the movable frame (424).

5. A fiber board thickness detection device according to claim 4, characterized in that: The driving assembly (44) comprises: A support rod (441), wherein the support rod (441) is fixed to the inner wall of the workbench (1); A rotating shaft (442), the rotating shaft (442) being rotatably inserted into one end of the supporting rod (441) via a bearing; A rotating disk (443), the rotating disk (443) is fixedly inserted into the top of the rotating shaft (442), the bottom of the rotating disk (443) is connected to the marking mechanism (5), and the outer wall of the rotating disk (443) is extruded and connected to the closing mechanism (6); A positioning pin rod (444), the positioning pin rod (444) being fixed to the outer side of the upper surface of the rotating disk (443), the positioning pin rod (444) being slidably interlaced with the inner cavity of the movable frame (424); A servo motor (445) is fixed to the bottom of the support rod (441) via a supporting frame.

6. A fiberboard thickness detection device according to claim 5, characterized in that: The output end of the servo motor (445) is drivingly connected to the bottom of the rotating shaft (442), and the movable frame (424) is located above the rotating disk (443) in a swinging state via a positioning pin rod (444).

7. A fiber board thickness detection device according to claim 5, characterized in that: The marking mechanism (5) comprises: A support frame (51), wherein the support frame (51) is fixed to the bottom of the rotating disk (443) by screws; An electric telescopic rod (52), wherein the electric telescopic rod (52) is fixedly inserted into the middle portion of the support frame (51); A marking component (53), wherein the marking component (53) is mounted on the telescopic end of the electric telescopic rod (52).

8. A fiberboard thickness detection device according to claim 7, characterized in that: The marking component (53) comprises: A support block (531), wherein the support block (531) is mounted on the telescopic bottom end of the electric telescopic rod (52) by means of bolts; A card slot (532), wherein the card slot (532) is provided at one end of the support block (531); A rubber pad (533), wherein the rubber pad (533) is fixed to the inner wall of the slot (532); A locking bolt (534), wherein the locking bolt (534) is threadedly inserted into one side of the slot (532); a first tension spring (535), wherein the first tension spring (535) is fixed to the top of the support block (531); A marking pen (536), wherein the top of the marking pen (536) is clamped to the top of the first tension spring (535), and the marking pen (536) is inserted into the inner cavity of the clamping slot (532).

9. A fiber board thickness detection device according to claim 5, characterized in that: The closing mechanism (6) comprises: A limiting frame (61), wherein the limiting frame (61) is fixed to the top of the support rod (441); A push switch (62), the push switch (62) being fixed to one end of the limit frame (61), the push switch (62) being used to reset and close the electric telescopic rod (52); a second tension spring (63), the second tension spring (63) being fixed to the other end of the inner wall of the limiting frame (61); A push rod (64), the push rod (64) is slidably inserted into the other end of the limit frame (61), one end of the push rod (64) is fixed to one end of the second tension spring (63) through a clamping plate, and the push rod (64) presses the push switch (62) to close by squeezing the rotating disk (443).

10. The method for using the fiber board thickness detection device according to any one of claims 1 to 9, characterized in that: The specific usage steps are as follows: Step 1: The fiber sheet is slowly moved horizontally on the conveyor belt (2), and the laser distance meter (43) is started by the digital display controller (3) so that the laser distance meter (43) can measure the thickness of the sheet. The distance between the laser distance meter (43) and the conveyor belt (2) minus the distance between the laser distance meter (43) and the sheet is the thickness of the sheet. At the same time, the servo motor (445) drives the turntable (443) to rotate, so that the positioning pin rod (444) drives the movable frame (424) to swing, so that the fan-shaped tooth block (422) drives the slider (421) to move horizontally, and cooperates with the conveyor belt (2) to move the sheet, so that the laser distance meter (43) can perform corrugated track multi-point measurement of the thickness of the sheet; Step 2: After the data measured by the laser rangefinder (43) is transmitted to the digital display controller (3), if the error of the multi-point measurement result is within the specified range, the thickness of the plate is qualified. The plate continues to move to the other end of the conveyor belt. If the error of the measurement result is not within the specified range, the thickness of the plate is unqualified. At this time, the digital display controller (3) sends a driving signal to the electric telescopic rod (52), and the electric telescopic rod (52) drives the marking pen (536) to move to the plate below the turntable (443) and rotate with the turntable (443), so that the marking pen (536) can mark the plate with an elliptical circle; Step 3: After the turntable (443) drives the marking pen (536) to rotate one circle, the protrusion on the outer wall of the turntable (443) pushes the push rod (64), so that the push rod (64) presses the push switch (62), so that the electric telescopic rod (52) is reset and closed, and so on and so forth, and the thickness of the next plate can be detected.

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