A flatness detection device with multi-point detection function

Abstract

The application discloses a flatness detection device with multi-point detection function and relates to the technical field of flatness detection devices. The flatness detection device comprises a shell, a driving motor is installed above the shell, a driving gear is installed on an output shaft of the driving motor, driven gears are installed on both sides of the driving gear, transmission shafts are installed in the middle of the driven gears on both sides, a dust collecting cover is installed below the left transmission shaft, a first cam is installed in the dust collecting cover, a plurality of brush plates are arranged on the lower side of the first cam, a detection plate is installed below the right transmission shaft, a second cam is installed on the detection plate, a plurality of sliding cylinders are installed on the outer side of the second cam, a plurality of marking cylinders are installed on the outer side of the plurality of sliding cylinders, and walking wheels are installed at the bottom of the shell. The application is characterized in that: the surface to be detected is cleaned by pressurized air, and the cleaning effect of the surface to be detected is improved by cooperation with the brush washing, so that the flatness detection is facilitated, and the detection efficiency and detection accuracy are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flatness detection devices, and specifically relates to a flatness detection device with multi-point detection function. BACKGROUND

[0002] ‌The flatness detection device plays a vital role in many industrial fields, especially in the construction material, road construction, mechanical manufacturing and other industries. With the continuous progress of technology and the intensification of market competition, enterprises have increasingly high requirements for product quality. As one of the key indicators for measuring product quality, the accuracy and efficiency of the detection technology of flatness are directly related to the market competitiveness of products and the economic benefits of enterprises.

[0003] The existing flatness detection device mainly has the following problems: (1) the surface to be detected is not cleaned, resulting in inaccurate detection results, (2) the surface with non-conforming flatness is not marked, which is not convenient for later processing. SUMMARY

[0004] The present application aims to provide a flatness detection device with multi-point detection function to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a flatness detection device with multi-point detection function, comprising a shell, a driving motor is installed above the shell, a driving gear is installed on the output shaft of the driving motor, a driven gear is installed on both sides of the driving gear, a transmission shaft is installed in the middle of both driven gears, a dust collecting hood is installed below the left transmission shaft, a first cam is installed in the dust collecting hood, a plurality of brush plates are arranged on the lower side of the first cam, a detection plate is installed below the right transmission shaft, a second cam is installed on the detection plate, a plurality of sliding cylinders are installed on the outer side of the second cam, a plurality of marking cylinders are installed on the outer side of the plurality of sliding cylinders, and a walking wheel is installed at the bottom of the shell.

[0006] The dust collecting hood is installed on the shell, the middle upper side of the left driven gear is installed on the shell through a first one-way bearing, the middle upper side of the right driven gear is installed on the shell through a second one-way bearing, the first one-way bearing and the second one-way bearing are mirror image arranged, and the two transmission shafts are respectively installed on the lower side of the middle of the two driven gears.

[0007] The left transmission shaft lower end penetrates the dust collecting cover and is connected with the first cam, the first cam is hollow, a tympanic membrane is arranged in the first cam, a reset tension spring and a heat conducting medium are arranged between the upper side of the tympanic membrane and the first cam, a filter screen is connected between the lower side of the tympanic membrane and the first cam, the tympanic membrane and the filter screen are both provided with a plurality of folds, the heat conducting medium is made of a material that expands when heated, the heat conducting medium is in contact with a metal plate, and the metal plate is arranged on the inner wall of the first cam.

[0008] A plurality of electromagnets are arranged on the dust collecting cover, the electromagnets are located outside the first cam, and the metal plate is located in the magnetic field of the electromagnets.

[0009] A plurality of suction ports are arranged on the first cam in the filter screen, the suction ports face the surface to be detected, an exhaust port is arranged on the first cam outside the filter screen, and a one-way valve is arranged in the exhaust port and the plurality of suction ports.

[0010] A plurality of protrusions are arranged outside the first cam, a pressurizing box is arranged on the dust collecting cover between the electromagnets, a pressurizing rod is slidably arranged in the pressurizing box, the pressurizing rod and the pressurizing box are in sliding sealing connection, the pressurizing rod is connected with the pressurizing box through a first spring, and the other end of the pressurizing rod penetrates the pressurizing box and abuts against the protrusion on the first cam.

[0011] An air inlet and a plurality of air injection ports are arranged on the pressurizing box, the air inlet is located on one side of the air injection ports, the air injection ports face the surface to be detected, and a one-way valve is arranged in the air inlet and the plurality of air injection ports.

[0012] The right transmission shaft penetrates the detection plate and is connected with the second cam, the detection plate is arranged on the shell, a plurality of sliding grooves are arranged on the detection plate, a plurality of sliding cylinders are slidably arranged in the sliding grooves, a second spring is arranged between the sliding cylinder and the detection plate, and the second spring is located in the sliding groove.

[0013] A plurality of protrusions are arranged outside the second cam, the upper end of the sliding cylinder abuts against the protrusion on the second cam, and a longitudinal cylinder is arranged at the lower end of the sliding cylinder.

[0014] The longitudinal cylinder is hollow, a moving cylinder is slidably arranged outside the longitudinal cylinder, a telescopic spring is arranged between the longitudinal cylinder and the moving cylinder, the telescopic spring is electrically connected with the control system at both ends, and a contact ball is rotatably arranged on the moving cylinder.

[0015] The driven gears on both sides are engaged with a transmission belt, and the driving gear is engaged with the transmission belt.

[0016] A plurality of said marking barrels are installed on the detection plate, and the plurality of said marking barrels are arranged in a square shape, and said marking barrels are sequentially provided with air bags and air jet plates, said air jet plates are provided with marking liquid, said air jet plates are provided with a plurality of liquid injection holes, said air bags are connected with said air jet plates through pipelines at one end, and said air bags are connected with a pressurized box through pipelines at the other end, said pipelines connected with said air bags are provided with electromagnetic valves and flow meters, and said electromagnetic valves and flow meters are electrically connected with a control system.

[0017] Said brush plate is provided with brushes, said brushes are in contact with the surface to be detected, a control panel is installed on said shell, and said control panel is provided with a control system.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] 1. The surface to be detected is cleaned to improve the detection accuracy. The left transmission shaft simultaneously drives the first cam to rotate, the first cam drives the brush plate to rotate, and the brushes on the brush plate clean the surface to be detected, the air jet nozzles simultaneously spray air on the surface to be detected, the pressurized air cleans the surface to be detected, and the cleaning effect is improved by cooperating with the brushing to facilitate the flatness detection, improve the detection efficiency and detection accuracy.

[0020] 2. The unqualified position of the surface to be detected is marked for further processing. When the flatness data calculated by the control system is within the set tolerance, the control system determines that the flatness of the surface to be detected is qualified; when the flatness data of the surface to be detected calculated by the control system is outside the tolerance, the control system determines that the flatness of the surface to be detected is unqualified, at this time, the control system opens the electromagnetic valve in the pipeline between the air bag and the air jet plate, the gas in the air bag enters the air jet plate through the pipeline, the gas drives the marking liquid in the air jet plate to be sprayed on the surface to be detected through the liquid injection holes, and the marking liquid sprayed by a plurality of air jet plates forms a square frame to mark the unqualified position for further processing and improve the detection efficiency.

[0021] 3. Multi-point detection processing, further expanding the detection range. The control system controls the driving motor to reverse, the driving motor drives the driving gear to reverse, the driving gear drives the driven gear on the right side to rotate through the transmission belt, the driven gear on the right side drives the transmission shaft on the right side to reverse through the second one-way bearing, the transmission shaft on the right side drives the second cam to rotate, the protrusions on the second cam push the sliding cylinder to move away from the second cam, the sliding cylinder drives the contact ball to slide on the surface to be detected, and the displacement sensor feedbacks the displacement data to the control system in real time to realize the multi-point detection function and further expand the detection range. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the whole application;

[0023] Figure 2 is a bottom view of the whole application;

[0024] Figure 3 is a structural schematic diagram of the transmission belt in the application;

[0025] Figure 4 is a bottom view of Figure 3 ;

[0026] Figure 5 is a partial enlarged view of A area in Figure 4 ;

[0027] Figure 6 is a structural schematic diagram of the first cam in the application;

[0028] Figure 7 is a structural schematic diagram of the filter screen and the eardrum in the application;

[0029] Figure 8 is a longitudinal sectional view of Figure 7 ;

[0030] In the figure: 1, control panel; 11, shell; 12, traveling wheel; 13, transmission shaft; 14, transmission belt; 2, driving motor; 21, driving gear; 22, driven gear; 23, dust collecting cover; 231, electromagnet; 232, pressurizing box; 233, air inlet; 234, air outlet; 235, metal plate; 236, pressurizing rod; 24, first cam; 241, brush plate; 242, eardrum; 243, filter screen; 3, detection plate; 31, second cam; 32, sliding cylinder; 33, longitudinal cylinder; 34, telescopic spring; 35, contact ball; 36, moving cylinder; 4, marker cylinder; 41, air bag; 42, air jet plate. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0032] Embodiment: as Figures 1-8As shown, the present application provides a flatness detection device with multi-point detection function, which comprises a shell 11, a driving motor 2 is installed above the shell 11, a driving gear 21 is installed on the output shaft of the driving motor 2, driven gears 22 are installed on both sides of the driving gear 21, transmission shafts 13 are installed in the middle of both sides of the driven gears 22, both sides of the driven gears 22 are engaged with a transmission belt 14, the driving gear 21 is engaged with the transmission belt 14, a dust collecting cover 23 is installed below the left transmission shaft 13, a first cam 24 is installed in the dust collecting cover 23, a plurality of brush plates 241 are arranged on the lower side of the first cam 24, brushes are arranged on the brush plates 241 and contact the surface to be detected, a detection plate 3 is installed below the right transmission shaft 13, a second cam 31 is installed on the detection plate 3, a plurality of sliding cylinders 32 are installed on the outer side of the second cam 31, a plurality of marking cylinders 4 are installed on the outer side of the sliding cylinders 32, walking wheels 12 are installed at the bottom of the shell 11, a control panel 1 is installed on the shell 11, and a control system is arranged in the control panel 1.

[0033] The dust collecting cover 23 is installed on the shell 11, the middle upper side of the left driven gear 22 is installed on the shell 11 through a first one-way bearing, the middle upper side of the right driven gear 22 is installed on the shell 11 through a second one-way bearing, the first one-way bearing and the second one-way bearing are mirror image arranged, and the two transmission shafts 13 are respectively installed on the lower sides of the middle of the two driven gears 22; the lower end of the left transmission shaft 13 passes through the dust collecting cover 23 and is connected with the first cam 24, the first cam 24 is hollow, a tympanic membrane 242 is arranged in the first cam 24, a reset tension spring and a heat conducting medium are arranged between the upper side of the tympanic membrane 242 and the first cam 24, a filter screen 243 is connected between the lower side of the tympanic membrane 242 and the first cam 24, the tympanic membrane 242 and the filter screen 243 are both provided with a plurality of wrinkles, the heat conducting medium is made of a material that expands when heated, the heat conducting medium contacts a metal plate 235, and the metal plate 235 is arranged on the inner wall of the first cam 24.

[0034] The dust collecting cover 23 is provided with a plurality of electromagnets 231, the plurality of electromagnets 231 are located outside the first cam 24, and the metal plate 235 is located in the magnetic field of the electromagnets 231; the first cam 24 located in the filter screen 243 is provided with a plurality of suction ports, the plurality of suction ports are opposite to the surface to be detected, the first cam 24 located outside the filter screen 243 is provided with an exhaust port, and the exhaust port and the plurality of suction ports are all provided with a one-way valve; the first cam 24 is provided with a plurality of protrusions outside, the dust collecting cover 23 between the plurality of electromagnets 231 is provided with a pressurizing box 232, the pressurizing box 232 is internally and slidably provided with a pressurizing rod 236, the pressurizing rod 236 and the pressurizing box 232 form a sliding sealing connection, the pressurizing rod 236 is connected with the pressurizing box 232 through a first spring at one end, and the other end of the pressurizing rod 236 penetrates through the pressurizing box 232 and abuts against the protrusion on the first cam 24; the pressurizing box 232 is provided with an air inlet 233 and a plurality of air injection ports 234, the air inlet 233 is located on one side of the air injection ports 234, the air injection ports 234 are opposite to the surface to be detected, and the air inlet 233 and the plurality of air injection ports 234 are all provided with a one-way valve.

[0035] The right transmission shaft 13 penetrates through the detection plate 3 and is connected with the second cam 31, the detection plate 3 is installed on the shell 11, the detection plate 3 is provided with a plurality of sliding grooves, a plurality of sliding cylinders 32 are slidably installed in the plurality of sliding grooves respectively, the second spring is connected between the sliding cylinder 32 and the detection plate 3, and the second spring is located in the sliding groove; the second cam 31 is provided with a plurality of protrusions outside, the upper end of the sliding cylinder 32 abuts against the protrusion on the second cam 31, and the lower end of the sliding cylinder 32 is provided with a longitudinal cylinder 33.

[0036] The longitudinal cylinder 33 is hollow inside, the moving cylinder 36 is slidably installed outside the longitudinal cylinder 33, the telescopic spring 34 is connected between the longitudinal cylinder 33 and the moving cylinder 36, the two ends of the telescopic spring 34 are electrically connected with the control system, and the contact ball 35 is rotationally arranged on the moving cylinder 36; the displacement sensor and the pressure sensor are installed on the longitudinal cylinder 33, the displacement sensor and the pressure sensor are electrically connected with the control system, and the displacement sensor is used for detecting the displacement of the contact ball 35.

[0037] A plurality of marking cylinders 4 are installed on the detection plate 3, the plurality of marking cylinders 4 are arranged in a square shape, the marking cylinder 4 is sequentially provided with an air bag 41 and a gas injection plate 42, the gas injection plate 42 is provided with a marking liquid, the gas injection plate 42 is provided with a plurality of liquid injection holes, the air bag 41 is connected with the gas injection plate 42 through a pipeline at one end, the other end of the air bag 41 is connected with the pressurizing box 232 through a pipeline, the pipeline connected with the air bag 41 is provided with an electromagnetic valve and a flowmeter, and the electromagnetic valve and the flowmeter are electrically connected with the control system.

[0038] Working principle: press the start button on the control panel 1, the device starts, the detection device is placed on the surface to be detected, the brush on the brush plate 241 is in contact with the surface to be detected, the control system drives the motor 2 to rotate the driving gear 21, the driving gear 21 drives the two driven gears 22 on both sides through the transmission belt 14, since the first one-way bearing and the second one-way bearing are mirror image, the left driven gear 22 drives the left transmission shaft 13 to rotate, while the right driven gear 22 cannot drive the right transmission shaft 13 to rotate, the left transmission shaft 13 drives the first cam 24 to rotate, the first cam 24 drives the brush plate 241 to rotate, and the brush on the brush plate 241 is used to clean the surface to be detected;

[0039] When the protrusion on the first cam 24 approaches the pressure rod 236, the encoder in the driving motor 2 feeds back the rotation data of the first cam 24 to the control system, the control system opens the electromagnetic valve in the pipeline between the air bag 41 and the pressure tank 232, the protrusion on the first cam 24 pushes the pressure rod 236 to move into the pressure tank 232, the pressure rod 236 stretches the first spring at the same time, the pressure rod 236 pushes the air in the pressure tank 232 to be sprayed out of the air jet 234 and delivered into the air bag 41 through the pipeline, the flowmeter in the pipeline detects the air flow of the air bag 41 in real time, when the gas in the air bag 41 reaches the set requirement, the electromagnetic valve in the pipeline is closed; the air jet 234 sprays air on the surface to be detected, which cleans the surface to be detected by pressurized air, and cooperates with the brush to improve the cleaning effect; the control system simultaneously connects the electromagnet 231 into the circuit, so that the electromagnet 231 generates a magnetic field, and the metal plate 235 cuts the magnetic induction lines in the magnetic field of the electromagnet 231, generates current in the metal plate 235 and heats up, the metal plate 235 conducts heat to the heat conducting medium, the heat conducting medium absorbs heat and expands rapidly, the heat conducting medium pushes the eardrum 242 to protrude downward, the eardrum 242 stretches the reset tension spring at the same time, and the eardrum 242 protrudes downward while the wrinkles gradually unfold, the eardrum 242 extrudes the air on the lower side of the first cam 24 through the exhaust port;

[0040] With the first cam 24 continues to rotate, the first cam 24 on the convex away from the pressurized rod 236, the encoder in the drive motor 2 will be the first cam 24 rotation data feedback to the control system, the control system will be closed between the air bag 41 and the pressurized tank 232 pipe solenoid valve, the first spring is released, the first spring pull pressurized rod 236 to the pressurized tank 232 outside the movement, at this time the external air through the pipeline and the air inlet 233 into the pressurized tank 232, realize air supplement, in order to again to the surface to be detected cleaning processing; the control system will be de-energized simultaneously electromagnet 231, electromagnet 231 does not produce magnetic field, the metal plate 235 no longer cut magnetic induction line, the metal plate 235 does not produce current at the same time heat reduction, reset spring pull eardrum 242 protrude upwards, eardrum 242 from the unfolded state to the state of crumpling, eardrum 242 protrude upwards make the first cam 24 lower side of the chamber gradually larger, make the dust produced by the brush and the air jet into the first cam 24 through the adsorption port, realize the adsorption of dust, dust is filtered by the filter screen 243 deposited in the first cam 24, while the air next time through the exhaust port discharge.

[0041] When the surface to be detected is cleaned to the set time, the control system will be energized telescopic spring 34, telescopic spring 34 every turn produces the magnetic field of mutual attraction, the magnetic field compression telescopic spring 34, make telescopic spring 34 overall shortening, telescopic spring 34 pull the moving cylinder 36 moves upwards, moving cylinder 36 drive contact ball 35 upwards, make contact ball 35 away from the surface to be detected, prevent contact ball 35 and the surface to be detected friction caused by abrasion; after that, the control system through the walking wheel 12 drive shell 11 moves forward, shell 11 drive detection plate 3 and contact ball 35 move to the top of the surface to be detected, the encoder inside walking wheel 12 real time feedback position data to the control system, the control system will be de-energized telescopic spring 34, telescopic spring 34 in the action of its own spring force gradually lengthening, telescopic spring 34 push the moving cylinder 36 moves downwards, moving cylinder 36 drive contact ball 35 and the surface to be detected contact, at this time, the displacement sensor on the longitudinal cylinder 33 real time detection of the displacement of contact ball 35, and feedback data to the control system, because there are multiple groups of contact ball 35 and displacement sensor, so the control system can calculate the flatness of the surface to be detected;

[0042] When the need for multi-point detection, the control system control drive motor 2 reverse, drive motor 2 drive driving gear 21 reverse, driving gear 21 through the transmission belt 14 drive right side driven gear 22 rotation, right side driven gear 22 through the second one way bearing drive right side transmission shaft 13 reverse, right side transmission shaft 13 drive second cam 31 rotation, the second cam 31 on the convex push the sliding cylinder 32 to the side away from the second cam 31 movement, sliding cylinder 32 drive contact ball 35 on the surface to be detected sliding, displacement sensor real time feedback displacement data to the control system, to realize the function of multi-point detection.

[0043] After the flatness detection of the surface to be detected is completed, when the flatness data calculated by the control system is within the set tolerance, the control system determines that the flatness of the surface to be detected is qualified; when the flatness data of the surface to be detected calculated by the control system is outside the tolerance, the control system determines that the flatness of the surface to be detected is unqualified, at this time, the control system opens the electromagnetic valve in the pipeline between the air bag 41 and the air jet plate 42, so that the gas in the air bag 41 enters the air jet plate 42 through the pipeline, the gas drives the marking liquid in the air jet plate 42 to be sprayed on the surface to be detected through the liquid spraying hole, and the marking liquids sprayed by multiple groups of air jet plates 42 form a square frame, so as to mark the unqualified position for further processing.

[0044] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than that of the above description, and it is intended to include all changes that come within the meaning and range of equivalents of the claims. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

Claims

1. A flatness detection device with multi-point detection function, characterized in that: The device includes a housing (11), a drive motor (2) is mounted on the top of the housing (11), a drive gear (21) is mounted on the output shaft of the drive motor (2), driven gears (22) are mounted on both sides of the drive gear (21), a transmission shaft (13) is mounted in the middle of the driven gears (22) on both sides, a dust collection hood (23) is mounted below the transmission shaft (13) on the left side, a first cam (24) is mounted inside the dust collection hood (23), a plurality of brush plates (241) are provided on the lower side of the first cam (24), a detection plate (3) is mounted below the transmission shaft (13) on the right side, a second cam (31) is mounted on the detection plate (3), a plurality of sliding cylinders (32) are mounted on the outer side of the second cam (31), a plurality of marking cylinders (4) are mounted on the outer side of the plurality of sliding cylinders (32), and a traveling wheel (12) is mounted at the bottom of the housing (11). The detection plate (3) is provided with multiple sets of sliding grooves, and multiple sets of sliding cylinders (32) are slidably installed in the multiple sets of sliding grooves respectively. A second spring is connected between the sliding cylinder (32) and the detection plate (3). The second spring is located in the sliding groove. A longitudinal cylinder (33) is provided at the lower end of the sliding cylinder (32). The longitudinal cylinder (33) is hollow inside, and a movable cylinder (36) is slidably installed on the outside of the longitudinal cylinder (33). A telescopic spring (34) is connected between the longitudinal cylinder (33) and the movable cylinder (36). A contact ball (35) is rotatably installed on the movable cylinder (36). A displacement sensor and a pressure sensor are installed on the longitudinal cylinder (33). The marking cylinder (4) is provided with an airbag (41) and a jet plate (42) in sequence. The jet plate (42) is filled with marking liquid and has a number of spray holes.

2. The flatness detection device with multi-point detection function according to claim 1, characterized in that: The dust collection hood (23) is installed on the housing (11). The upper middle part of the driven gear (22) on the left is installed on the housing (11) through the first one-way bearing. The upper middle part of the driven gear (22) on the right is installed on the housing (11) through the second one-way bearing. The first one-way bearing and the second one-way bearing are mirror images of each other. The two sets of transmission shafts (13) are respectively installed on the lower middle part of the driven gears (22) on both sides.

3. A flatness detection device with multi-point detection function according to claim 2, characterized in that: The lower end of the drive shaft (13) on the left passes through the dust collection cover (23) and is connected to the first cam (24). The first cam (24) is hollow inside and a diaphragm (242) is provided inside the first cam (24). A reset spring and a heat-conducting medium are provided between the upper side of the diaphragm (242) and the first cam (24). A filter screen (243) is connected between the lower side of the diaphragm (242) and the first cam (24). Both the diaphragm (242) and the filter screen (243) are provided with several folds. The heat-conducting medium is a material that expands when heated. The heat-conducting medium is in contact with a metal plate (235). The metal plate (235) is provided on the inner wall of the first cam (24).

4. A flatness detection device with multi-point detection function according to claim 3, characterized in that: The dust collection hood (23) is provided with a number of electromagnets (231), the number of electromagnets (231) are located outside the first cam (24), and the metal plate (235) is located in the magnetic field of the electromagnets (231); The first cam (24) located inside the filter screen (243) is provided with a plurality of adsorption ports, and the first cam (24) located outside the filter screen (243) is provided with an exhaust port. One-way valves are installed in both the exhaust port and the plurality of adsorption ports.

5. A flatness detection device with multi-point detection function according to claim 4, characterized in that: The first cam (24) has several protrusions on its outer side. A pressure box (232) is provided on the dust collection cover (23) between several electromagnets (231). A pressure rod (236) is slidably installed inside the pressure box (232). The pressure rod (236) and the pressure box (232) form a sliding seal connection. One end of the pressure rod (236) is connected to the pressure box (232) by a first spring. The other end of the pressure rod (236) passes through the pressure box (232) and abuts against the protrusions on the first cam (24). The pressurization chamber (232) is provided with an air inlet (233) and several air jets (234). The air inlet (233) is located on one side of the air jets (234). One-way valves are installed in both the air inlet (233) and the several air jets (234).

6. A flatness detection device with multi-point detection function according to claim 5, characterized in that: The drive shaft (13) on the right side passes through the detection plate (3) and is connected to the second cam (31). The detection plate (3) is mounted on the housing (11). The second cam (31) has several protrusions on its outer side, and the upper end of the sliding cylinder (32) abuts against the protrusions on the second cam (31).

7. A flatness detection device with multi-point detection function according to claim 6, characterized in that: The two ends of the telescopic spring (34) are electrically connected to the control system, and the displacement sensor and pressure sensor are electrically connected to the control system.

8. A flatness detection device with multi-point detection function according to claim 7, characterized in that: The driven gears (22) on both sides are simultaneously engaged with the transmission belt (14), and the driving gear (21) is engaged with the transmission belt (14).

9. A flatness detection device with multi-point detection function according to claim 8, characterized in that: Multiple sets of the marking cylinders (4) are installed on the detection plate (3). The multiple sets of marking cylinders (4) are arranged in a square. One end of the airbag (41) is connected to the jet plate (42) through a pipe. The other end of the airbag (41) is connected to the pressurization box (232) through a pipe. A solenoid valve and a flow meter are installed in the pipe connected to the airbag (41). The solenoid valve and the flow meter are electrically connected to the control system.

10. A flatness detection device with multi-point detection function according to claim 9, characterized in that: The brush plate (241) is provided with a brush, which is in contact with the surface to be tested. The housing (11) is equipped with a control panel (1), which is provided with a control system.

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