Chalk writing detection device

Abstract

The invention discloses a chalk writing detection device, and relates to the technical field of chalk detection, the chalk writing detection device comprises a U plate, the inner wall of the bottom end of the U plate is provided with a first groove, the inner wall of the bottom end of the first groove is fixedly connected with a first electric slide rail, and the side wall of the top end of the first electric slide rail is slidably connected with a first slide plate. When the powdering degree of the chalk during writing needs to be detected, the powdering degree of the chalk during writing at different angles can be detected, meanwhile, the inclination state of the iron sheet blackboard on the inner wall of the sunken position can be simulated, and then the chalk with different inclination angles is made to write on the surface of the inclined writing board; the device can detect the powdering degree of the chalk when the chalk writes at the concave part of the iron sheet blackboard, can simulate the writing condition of the chalk at the bulge when the surface of the iron sheet blackboard bulges, and can detect the powdering degree of the chalk at different angles when the chalk writes at the bulge part of the iron sheet blackboard. And the detection effect and reliability of the device during detection of the chalk powdering degree are improved to a great extent.

Description

Technical Field

[0001] The invention belongs to the technical field of chalk detection, and in particular relates to a chalk writing detection device. Background Art

[0002] Chalk is a common writing tool, widely used in education, meetings, artistic creation, etc. It is usually made of calcium carbonate or gypsum powder and has white or other colors.

[0003] Before the manufactured chalk is shipped out of the factory, it is usually necessary to test the powdering degree of the chalk when writing. In the prior art, when testing the powdering degree of the chalk when writing, the chalk is directly used to write on the blackboard surface, and then the traces left by the chalk on the blackboard surface and the amount of chalk powder dropped during writing are observed to determine whether the powdering degree of the chalk when writing meets the requirements. However, when the user writes on the blackboard surface with the chalk, the position and angle of each person holding the chalk are different, which will cause the angle between the chalk and the blackboard to be different when writing. At this time, the powdering degree of the chalk will be different when writing on the blackboard surface with the chalk. When the powdering degree of the chalk is tested only at the same angle, the detection accuracy is low. In daily use, most teaching blackboards are iron blackboards. After long-term use, the iron blackboards are easily bumped and dented, and some iron blackboards will have bulges on the surface after use. The prior art cannot detect the powdering degree of the chalk when writing on the blackboard surface at the dented or bulged part, which greatly reduces the detection effect and accuracy of the chalk powdering degree detection.

[0004] Therefore, we propose a chalk writing detection device to solve the above problems. Summary of the invention

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A chalk writing detection device comprises a U-plate, wherein a first groove is provided on the inner wall of the bottom end of the U-plate, a first electric slide rail is fixedly connected to the inner wall of the bottom end of the first groove, a first slide rail is slidably connected to the top side wall of the first slide rail, a mounting plate is fixedly connected to the top side wall of the first slide rail, a chalk writing angle adjustment component is fixedly connected to the inner wall of the mounting plate, a second groove is provided on the inner wall of one end of the U-plate, a support spring is fixedly connected to the inner wall of the second groove, one end of the support spring is fixedly connected to a connecting plate, a chalk powder detection component is fixedly connected to the side wall of one end of the connecting plate, a first electric telescopic rod is fixedly connected to the inner wall of one end of the second groove, the telescopic end of the first electric telescopic rod is fixedly connected to a top plate, and a limit plate is fixedly connected to the inner wall of one end of the U-plate, and the side wall of the limit plate conflicts with the side wall of the connecting plate.

[0006] Preferably, the chalk writing angle adjustment assembly includes a second electric slide rail fixedly connected to the inner wall of the mounting plate, a second slide plate is slidably connected to the side wall of one end of the second electric slide rail, a first motor is fixedly connected to the side wall of one end of the second slide plate, an output end of the first motor is fixedly connected to a second electric telescopic rod, the telescopic end of the second electric telescopic rod is fixedly connected to a fixed plate, the inner wall of the fixed plate is rotatably connected to a round rod, the side wall of the fixed plate is fixedly connected to the second motor, and the output end of the second motor passes through the side wall of the fixed plate and is fixedly connected to one end of the round rod.

[0007] Preferably, the rod wall of the round rod is fixedly connected to a first pressure sensor, the detection end of the first pressure sensor is fixedly connected to a connecting column, one end of the connecting column is fixedly connected to a fixed cylinder, the inner wall of the fixed cylinder is fixedly connected to a plurality of third electric telescopic rods, the telescopic ends of the third electric telescopic rods are all fixedly connected to a first clamping plate, the outer wall of the fixed cylinder is symmetrically fixedly connected to two side panels, and the top side walls of the side panels are all fixedly connected to cameras.

[0008] Preferably, two fourth electric telescopic rods are symmetrically fixedly connected to the rod wall of the round rod, the telescopic ends of the fourth electric telescopic rods are fixedly connected to the third motor, the output ends of the third motors are fixedly connected to connecting blocks, the side walls of one end of the connecting blocks are fixedly connected to the fifth electric telescopic rods, and the telescopic ends of the fifth electric telescopic rods are fixedly connected to the second splint.

[0009] Preferably, the chalk powder detection assembly includes a sixth electric telescopic rod fixedly connected to the side wall at one end of the connecting plate, the telescopic end of the sixth electric telescopic rod is rotatably connected to the writing board, a third groove is provided on the side wall at one end of the writing board, a movable plate is movably connected to the inner wall of the third groove, and a support rod is rotatably connected to the side wall at one end of the movable plate, and one end of the support rod is fixedly connected to the side wall at one end of the connecting plate.

[0010] Preferably, the side walls of the writing board are symmetrically fixedly connected with two third electric slide rails, the side walls at one end of the third electric slide rails are slidably connected with a third slide plate, the side walls at one end of the two third slide plates are fixedly connected with the same eraser, the side walls of the eraser plate are in conflict with the side walls of the writing board, the bottom side wall of the writing board is fixedly connected with a detection shell, and the bottom inner wall of the detection shell is fixedly connected with a second pressure sensor.

[0011] Preferably, the detection end of the second pressure sensor is fixedly connected to a collecting plate, one end side wall of the detection shell is fixedly connected to a fourth electric slide rail, one end side wall of the fourth electric slide rail is slidably connected to a fourth slide plate, the side wall of the fourth slide plate is fixedly connected to a fixed block, the bottom end side wall of the fixed block is fixedly connected to a fourth motor, the top end side wall of the fixed block is fixedly connected to a collecting rod, and one end of the collecting rod is fixedly connected to a collecting shell.

[0012] Preferably, the output end of the fourth motor passes through the side wall of the fixed block and is fixedly connected to one end of the collecting rod, a plurality of through holes are provided on the side wall of the bottom end of the collecting shell, and collecting pipes are fixedly connected to the corresponding through holes, an air pump is fixedly connected to the side wall of one end of the collecting shell, the air inlet end of the air pump passes through the side wall of the collecting shell and extends inward, the air outlet end of the air pump is fixedly connected to a discharge pipe, and a collecting groove is provided inside the bottom end of the U-plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: By setting up the chalk powder degree detection component and the chalk writing angle adjustment component, when it is necessary to detect the chalk powder degree during writing, the first motor and the second motor can be controlled to adjust the angle of the chalk during writing, thereby simulating the angles of different people holding the chalk when writing, and then detecting the chalk powder degree when writing at different angles, thereby improving the detection accuracy, and at the same time, it can simulate the inclination state of the inner wall of the depression of the iron blackboard, and then make the chalks with different inclination angles write on the inclined writing board surface to detect the chalk powder degree when writing at the depression of the iron blackboard, and it can also simulate the situation of the chalk writing at the bulge when the iron blackboard surface bulges, and then adjust the angle of the chalk when writing to detect the chalk powder degree when writing at different angles on the bulge of the iron blackboard, thereby greatly improving the detection effect and reliability of the device for detecting chalk powder degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention from other angles; Figure 3 It is a schematic cross-sectional view of some structures of the present invention. Figure 1 ; Figure 4 For the present invention Figure 3 A magnified view of part A; Figure 5 It is a schematic diagram of the partial structure of the present invention Figure 1 ; Figure 6 It is a schematic diagram of the partial structure of the present invention Figure 2 ; Figure 7 It is a schematic diagram of the partial structure of the present invention Figure 3 ; Figure 8 It is a schematic cross-sectional view of some structures of the present invention. Figure 2 ; Fig. 9 It is a schematic diagram of the partial structure of the present invention Figure 4 ; Fig.10For the present invention Fig. 9 Enlarged view of part B.

[0015] In the figure: 1, U plate; 2, first groove; 3, first electric slide rail; 4, first slide plate; 5, mounting plate; 6, chalk writing angle adjustment assembly; 61, second electric slide rail; 62, second slide plate; 63, first motor; 64, second electric telescopic rod; 65, fixing plate; 66, round rod; 67, second motor; 68, first pressure sensor; 69, connecting column; 610, fixing cylinder; 611, third electric telescopic rod; 612, first clamping plate; 613, side plate; 614, camera; 615, fourth electric telescopic rod; 616, third motor; 617, connecting block; 618, fifth electric telescopic rod; 619, second clamping plate; 7, second groove; 8, support spring; 9, Connecting plate; 10. Chalk powder detection component; 101. Sixth electric telescopic rod; 102. Writing board; 103. Third groove; 104. Moving plate; 105. Support rod; 106. Third electric slide rail; 107. Third slide plate; 108. Eraser; 109. Detection shell; 1010. Second pressure sensor; 1011. Collecting plate; 1012. Fourth electric slide rail; 1013. Fourth slide plate; 1014. Fixed block; 1015. Fourth motor; 1016. Collecting rod; 1017. Collecting shell; 1018. Collecting tube; 1019. Air pump; 1020. Discharging tube; 1021. Collecting trough; 11. First electric telescopic rod; 12. Top plate; 13. Limiting plate. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] The following electrical components are all electrically connected to the peripheral PLC controller.

[0018] Reference Figure 1 - Fig.10A chalk writing detection device comprises a U-plate 1, a first groove 2 is provided on the inner wall of the bottom end of the U-plate 1, a first electric slide rail 3 is fixedly connected to the inner wall of the bottom end of the first groove 2, a first slide plate 4 is slidably connected to the top side wall of the first slide plate 4, a mounting plate 5 is fixedly connected to the top side wall of the first slide plate 4, a chalk writing angle adjustment component 6 is fixedly connected to the inner wall of the mounting plate 5, a second groove 7 is provided on the inner wall of one end of the U-plate 1, a support spring 8 is fixedly connected to the inner wall of the second groove 7, a connecting plate 9 is fixedly connected to one end of the support spring 8, a chalk powder detection component 10 is fixedly connected to the side wall of one end of the connecting plate 9, a first electric telescopic rod 11 is fixedly connected to the inner wall of one end of the second groove 7, a top plate 12 is fixedly connected to the telescopic end of the first electric telescopic rod 11, a limiting plate 13 is fixedly connected to the inner wall of one end of the U-plate 1, and the side wall of the limiting plate 13 conflicts with the side wall of the connecting plate 9.

[0019] Specifically, it can simulate the situation where a piece of chalk is writing on a bulge on the surface of a metal blackboard, and then adjust the angle of the chalk when writing to detect the degree of powder applied when the chalk is writing on the bulge on the metal blackboard at different angles, thereby greatly improving the detection effect and reliability of the device for detecting the degree of powder applied to the chalk.

[0020] In the embodiment, the chalk writing angle adjustment assembly 6 includes a second electric slide rail 61 fixedly connected to the inner wall of the mounting plate 5, a second slide plate 62 is slidably connected to the side wall of one end of the second electric slide rail 61, a first motor 63 is fixedly connected to the side wall of one end of the second slide plate 62, an output end of the first motor 63 is fixedly connected to a second electric telescopic rod 64, a telescopic end of the second electric telescopic rod 64 is fixedly connected to a fixed plate 65, a round rod 66 is rotatably connected to the inner wall of the fixed plate 65, a second motor 67 is fixedly connected to the side wall of the fixed plate 65, and an output end of the second motor 67 passes through the side wall of the fixed plate 65 and is fixedly connected to one end of the round rod 66; The rod wall of the round rod 66 is fixedly connected to a first pressure sensor 68, the detection end of the first pressure sensor 68 is fixedly connected to a connecting column 69, one end of the connecting column 69 is fixedly connected to a fixing cylinder 610, the inner wall of the fixing cylinder 610 is fixedly connected to a plurality of third electric telescopic rods 611, the telescopic ends of the third electric telescopic rods 611 are all fixedly connected to a first clamping plate 612, the outer wall of the fixing cylinder 610 is symmetrically fixedly connected to two side plates 613, and the top side walls of the side plates 613 are all fixedly connected to cameras 614; Two fourth electric telescopic rods 615 are symmetrically fixedly connected to the rod wall of the round rod 66, the telescopic ends of the fourth electric telescopic rods 615 are fixedly connected to the third motor 616, the output ends of the third motors 616 are fixedly connected to the connecting blocks 617, one end side walls of the connecting blocks 617 are fixedly connected to the fifth electric telescopic rods 618, and the telescopic ends of the fifth electric telescopic rods 618 are fixedly connected to the second clamping plates 619.

[0021] Specifically, when it is necessary to detect the degree of chalk applied when writing, the angle of the chalk when writing can be adjusted by controlling the first motor 63 and the second motor 67, thereby simulating the angles of different people holding the chalk when writing, and then the degree of chalk applied when writing at different angles can be detected to improve the accuracy of the detection.

[0022] In the embodiment, the chalk powder detection assembly 10 includes a sixth electric telescopic rod 101 fixedly connected to the side wall of one end of the connecting plate 9, the telescopic end of the sixth electric telescopic rod 101 is rotatably connected to the writing board 102, the side wall of one end of the writing board 102 is provided with a third groove 103, the inner wall of the third groove 103 is movably connected to the moving plate 104, the side wall of one end of the moving plate 104 is rotatably connected to the support rod 105, and one end of the support rod 105 is fixedly connected to the side wall of one end of the connecting plate 9; Two third electric slide rails 106 are symmetrically fixedly connected to the side wall of the writing board 102, and a third slide plate 107 is slidably connected to the side wall of one end of each of the third electric slide rails 106. The side walls of one end of the two third slide plates 107 are fixedly connected to the same eraser 108, and the side wall of the eraser 108 is in conflict with the side wall of the writing board 102. A detection shell 109 is fixedly connected to the bottom side wall of the writing board 102, and a second pressure sensor 1010 is fixedly connected to the bottom inner wall of the detection shell 109; The detection end of the second pressure sensor 1010 is fixedly connected with a collecting plate 1011, one end side wall of the detection shell 109 is fixedly connected with a fourth electric slide rail 1012, one end side wall of the fourth electric slide rail 1012 is slidably connected with a fourth slide plate 1013, the side wall of the fourth slide plate 1013 is fixedly connected with a fixing block 1014, the bottom end side wall of the fixing block 1014 is fixedly connected with a fourth motor 1015, the top end side wall of the fixing block 1014 is fixedly connected with a collecting rod 1016, and one end of the collecting rod 1016 is fixedly connected with a collecting shell 1017; The output end of the fourth motor 1015 passes through the side wall of the fixed block 1014 and is fixedly connected to one end of the collecting rod 1016. A plurality of through holes are provided on the side wall of the bottom end of the collecting shell 1017, and a collecting tube 1018 is fixedly connected to the corresponding through holes. An air pump 1019 is fixedly connected to the side wall of one end of the collecting shell 1017. The air inlet end of the air pump 1019 passes through the side wall of the collecting shell 1017 and extends inward. The air outlet end of the air pump 1019 is fixedly connected to a discharge pipe 1020. A collecting groove 1021 is provided inside the bottom end of the U-plate 1.

[0023] Specifically, the tilted state of the inner wall of the iron blackboard in the depression can be simulated, and then chalks with different tilt angles are made to write on the inclined writing board 102 surface to detect the degree of chalk application when writing on the depression of the iron blackboard.

[0024] The operating principle of the present invention is now described as follows:In the present invention, when it is necessary to detect the powder content of chalk writing, the staff first puts the chalk to be detected into the fixed tube 610, and then controls the third electric telescopic rod 611 to start, driving the first clamping plate 612 to move toward the chalk, and fixes the chalk by the first clamping plate 612, and then controls the second motor 67 to start, driving the round rod 66 to rotate, thereby driving the chalk to rotate, so that one end of the chalk corresponds to the side wall of the writing board 102, and then controls the rotation of the first motor 63 and the second motor 67 to adjust the angle of the chalk after it contacts the side wall of the writing board 102, and then controls the second electric telescopic rod 64 to start, driving the chalk to move toward the writing board 102, and after one end of the chalk contacts the side wall of the writing board 102, At this time, the first pressure sensor 68 records the value of the pressure applied to the chalk at this time, and then controls the first electric slide rail 3 and the second electric slide rail 61 to start, driving the first slide plate 4 and the second slide plate 62 to move, driving the chalk to move, so that the chalk is written on the surface of the writing board 102. During the chalk writing process, one end of the chalk will be continuously rubbed off. When the first pressure sensor 68 detects that the value of the pressure applied to the chalk becomes smaller, it will control the second electric telescopic rod 64 to continue to start, so that one end of the chalk can always be in contact with the side wall of the writing board 102 during the writing process. When one end of the chalk is about to be rubbed off to the outside of the fixed tube 610, the second electric telescopic rod 64 is controlled to shrink a distance, and then the third motor 616 is controlled to start, driving the connecting block 61 7 stops after rotating 180 degrees, and then controls the fifth electric telescopic rod 618 to start, and uses the second clamping plate 619 to clamp the chalk. At this time, controls the third electric telescopic rod 611 to shrink, so that the first clamping plate 612 does not fix the chalk, and then controls the two fourth electric telescopic rods 615 to start, driving the chalk to move upward for a distance inside the fixing tube 610, so that one end of the chalk can continue to write on the surface of the writing board 102, and then uses the first clamping plate 612 to fix the chalk again, and then controls the second clamping plate 619 to restore the original position, and then controls the second electric telescopic rod 64 to start, so that the chalk contacts the surface of the writing board 102 again, and continues to write on the surface of the writing board 102, and the whole chalk is all on the surface of the writing board 102 at the same angle. After the writing is completed, the two cameras 614 on one side of the fixed tube 610 are used to observe the powdering degree of the chalk at this angle when writing. During the writing process, the part of the chalk that is not powdered will fall onto the collecting plate 1011 in the detection shell 109. At this time, the second pressure sensor 1010 will detect the pressure of the falling powder on the collecting plate 1011, analyze the amount of powder falling, and thus detect the powdering degree of the chalk when writing at this angle. Then, the third electric slide rail 106 is controlled to start, driving the third slide plate 107 to move, so that the erasing plate 108 erases the writing marks on the surface of the writing board 102. At this time, the powder will fall into the detection shell 109, and then the fourth motor 1015 is controlled to start, driving the collecting rod 1016 to rotate 180 degrees and then stop.The collecting shell 1017 is positioned above the detecting shell 109, and at this time, the lower end of the discharging pipe 1020 is positioned above the collecting tank 1021. Then, the air pump 1019 is controlled to start, and the air in the collecting shell 1017 is extracted, so that the collecting pipe 1018 absorbs the powder on the surface of the collecting plate 1011, and discharges it into the collecting tank 1021 through the discharging pipe 1020. In this process, the fourth electric slide rail 1012 is controlled to start, and the fourth slide plate 1013 is driven to move, so that the collecting shell 1017 moves above the detecting shell 109, and all the powder above the detecting plate is absorbed, so as to facilitate the subsequent detection of the powder content on the chalk. After that, the staff replaces the remaining chalk in the fixed cylinder 610 with a brand new chalk, and controls the first motor 63 and the second motor 64 to complete the detection of the powder on the chalk. The machine 67 continues to adjust the angle of the chalk when writing, and then detects the powdering degree of the chalk when writing at different angles according to the above method to ensure that the chalk shipped from the factory meets the powdering requirements when writing, and then controls the sixth electric telescopic rod 101 to start, driving the writing board 102 to move. Since the third groove 103 provided on the side wall of the writing board 102 is internally connected with a movable plate 104, and the movable plate 104 is rotatably connected to the support rod 105, at this time, as the sixth electric telescopic rod 101 drives the writing board 102 to move, the writing board 102 will rotate around the position where the support rod 105 is rotatably connected to the movable plate 104, and the movable plate 104 will move in the first groove 2 as the writing board 102 rotates, and the writing surface of the writing board 102 is tilted. , simulate the tilt state of the inner wall of the iron blackboard in the depression, then make chalks with different tilt angles write on the surface of the tilted writing board 102, according to the above method, to detect the degree of chalk applied when writing in the depression of the iron blackboard, and simulate the depression of different depths of the iron blackboard by adjusting the angle of the writing board 102, then control the writing board 102 to return to its original position, and then control the first electric telescopic rod 11 to shrink, so that the top plate 12 does not support the limit plate 13, and then adjust the angle of the writing board 102 again. At this time, when the chalk is writing on the surface of the writing board 102, the writing board 102 will shrink inward under the elastic force of the supporting spring 8 when it is under pressure. At this time, the degree of chalk applied will be reduced when writing with chalk, and the writing board 102 at this time has The angle of the chalk can be adjusted to simulate the specific situation of writing with chalk at the bulge when the surface of the iron blackboard is bulged. Then, the angle of the chalk can be adjusted to detect the degree of chalk applied at different angles when writing at the bulge of the iron blackboard. When it is necessary to detect the degree of chalk applied when writing, the angle of the chalk can be adjusted by controlling the first motor 63 and the second motor 67 to simulate the angle of different people holding the chalk to write. Then, the degree of chalk applied when writing at different angles can be detected to improve the accuracy of the detection. At the same time, the tilt state of the inner wall of the iron blackboard at the concave part can be simulated. Then, chalks with different tilt angles can be written on the inclined writing board 102 surface to detect the degree of chalk applied when writing at the concave part of the iron blackboard.It can also simulate the situation of writing with chalk on the bulge when the surface of the iron blackboard is bulged. Then, by adjusting the angle of the chalk when writing, the powder degree when writing with chalk at different angles on the bulge of the iron blackboard can be detected, which greatly improves the detection effect and reliability of the device in detecting the powder degree of chalk.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A chalk writing detection device, comprising a U-plate (1), characterized in that: The bottom inner wall of the U plate (1) is provided with a first groove (2), the bottom inner wall of the first groove (2) is fixedly connected to a first electric slide rail (3), the top side wall of the first electric slide rail (3) is slidably connected to a first slide plate (4), the top side wall of the first slide plate (4) is fixedly connected to a mounting plate (5), the inner wall of the mounting plate (5) is fixedly connected to a chalk writing angle adjustment component (6), and the inner wall of one end of the U plate (1) is provided with a second groove (7), the inner wall of the second groove (7) is fixedly connected to A support spring (8) is provided, one end of the support spring (8) is fixedly connected to a connecting plate (9), one end side wall of the connecting plate (9) is fixedly connected to a chalk powder detection component (10), one end inner wall of the second groove (7) is fixedly connected to a first electric telescopic rod (11), the telescopic end of the first electric telescopic rod (11) is fixedly connected to a top plate (12), one end inner wall of the U plate (1) is fixedly connected to a limiting plate (13), and the side wall of the limiting plate (13) is in conflict with the side wall of the connecting plate (9).

2. A chalk writing detection device according to claim 1, characterized in that: The chalk writing angle adjustment assembly (6) comprises a second electric slide rail (61) fixedly connected to the inner wall of the mounting plate (5); a second slide plate (62) is slidably connected to the side wall of one end of the second electric slide rail (61); a first motor (63) is fixedly connected to the side wall of one end of the second slide plate (62); an output end of the first motor (63) is fixedly connected to a second electric telescopic rod (64); the telescopic end of the second electric telescopic rod (64) is fixedly connected to a fixing plate (65); a round rod (66) is rotatably connected to the inner wall of the fixing plate (65); a second motor (67) is fixedly connected to the side wall of the fixing plate (65); and an output end of the second motor (67) passes through the side wall of the fixing plate (65) and is fixedly connected to one end of the round rod (66).

3. A chalk writing detection device according to claim 2, characterized in that: A first pressure sensor (68) is fixedly connected to the rod wall of the round rod (66); a detection end of the first pressure sensor (68) is fixedly connected to a connecting column (69); one end of the connecting column (69) is fixedly connected to a fixing cylinder (610); a plurality of third electric telescopic rods (611) are fixedly connected to the inner wall of the fixing cylinder (610); the telescopic ends of the third electric telescopic rods (611) are all fixedly connected to a first clamping plate (612); two side plates (613) are symmetrically fixedly connected to the outer wall of the fixing cylinder (610); and the top side walls of the side plates (613) are all fixedly connected to cameras (614).

4. A chalk writing detection device according to claim 3, characterized in that: Two fourth electric telescopic rods (615) are symmetrically fixedly connected to the rod wall of the round rod (66); the telescopic ends of the fourth electric telescopic rods (615) are fixedly connected to the third motor (616); the output ends of the third motors (616) are fixedly connected to the connecting blocks (617); the side walls of one end of the connecting blocks (617) are fixedly connected to the fifth electric telescopic rods (618); and the telescopic ends of the fifth electric telescopic rods (618) are fixedly connected to the second clamping plate (619).

5. A chalk writing detection device according to claim 1, characterized in that: The chalk powder detection assembly (10) comprises a sixth electric telescopic rod (101) fixedly connected to a side wall at one end of a connecting plate (9); the telescopic end of the sixth electric telescopic rod (101) is rotatably connected to a writing board (102); a third groove (103) is provided on a side wall at one end of the writing board (102); a movable plate (104) is movably connected to an inner wall of the third groove (103); a support rod (105) is rotatably connected to a side wall at one end of the movable plate (104); one end of the support rod (105) is fixedly connected to a side wall at one end of the connecting plate (9).

6. A chalk writing detection device according to claim 5, characterized in that: The side walls of the writing board (102) are symmetrically fixedly connected to two third electric slide rails (106), one end side walls of the third electric slide rails (106) are slidably connected to third slide plates (107), one end side walls of the two third slide plates (107) are fixedly connected to the same eraser (108), the side walls of the eraser (108) are in contact with the side walls of the writing board (102), the bottom side wall of the writing board (102) is fixedly connected to a detection shell (109), and the bottom inner wall of the detection shell (109) is fixedly connected to a second pressure sensor (1010).

7. A chalk writing detection device according to claim 6, characterized in that: The detection end of the second pressure sensor (1010) is fixedly connected to a collection plate (1011), one end side wall of the detection shell (109) is fixedly connected to a fourth electric slide rail (1012), one end side wall of the fourth electric slide rail (1012) is slidably connected to a fourth slide plate (1013), the side wall of the fourth slide plate (1013) is fixedly connected to a fixed block (1014), the bottom end side wall of the fixed block (1014) is fixedly connected to a fourth motor (1015), the top end side wall of the fixed block (1014) is fixedly connected to a collection rod (1016), and one end of the collection rod (1016) is fixedly connected to a collection shell (1017).

8. A chalk writing detection device according to claim 7, characterized in that: The output end of the fourth motor (1015) passes through the side wall of the fixed block (1014) and is fixedly connected to one end of the collecting rod (1016); a plurality of through holes are provided on the side wall of the bottom end of the collecting shell (1017), and collecting tubes (1018) are fixedly connected to the corresponding through holes; an air pump (1019) is fixedly connected to the side wall of one end of the collecting shell (1017); an air inlet end of the air pump (1019) passes through the side wall of the collecting shell (1017) and extends inward; an air outlet end of the air pump (1019) is fixedly connected to a discharge tube (1020); and a collecting groove (1021) is provided inside the bottom end of the U plate (1).

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