Multi-point contact flatness testing device and testing method thereof

Abstract

The application discloses a multi-point contact flatness testing device and a testing method thereof, wherein the device comprises a support frame, a detection table, a detection module, a lifting mechanism and a control system; the detection module is located above the detection table and comprises a mounting plate and a plurality of contact displacement sensors; a plurality of mounting holes arranged in a matrix are arranged on the mounting plate; the contact displacement sensors are detachably connected to the mounting holes and are used for acquiring flatness data of a measured workpiece when contacting the workpiece; the control system is electrically connected with the lifting mechanism and the contact displacement sensors and is used for controlling the lifting mechanism to drive the mounting plate to move towards the direction close to the measured workpiece until the contact displacement sensors contact the surface of the measured workpiece. The application solves the problems of inconvenient sensor installation, complicated position adjustment and low detection efficiency by detachably connecting a plurality of contact displacement sensors to a plurality of mounting holes arranged in a matrix.

Description

Technical Field

[0001] This invention relates to the field of precision manufacturing, and in particular to a multi-point contact flatness testing device and its testing method. Background Technology

[0002] In the field of precision manufacturing, flatness is a key indicator for measuring the quality of workpiece processing. Even slight deviations can affect the assembly accuracy and reliability of products. It is widely used in industries such as semiconductors, 3C electronics, and precision machinery.

[0003] Currently, flatness inspection is mainly divided into two categories: contact and non-contact. Non-contact inspection equipment is expensive and has strict environmental requirements, making it difficult to widely apply. Although traditional contact inspection devices are cheaper and more widely used, existing sensors mostly use fixed bolt or welding connections. During installation, precise alignment of the mounting holes and repeated adjustments are required, which is cumbersome and time-consuming. Moreover, the detection points are different for different workpieces, requiring disassembly and repositioning of the fixing structure. This makes it impossible to quickly detect different detection points on different workpieces, resulting in low inspection efficiency and difficulty in continuous inspection of batches of workpieces, significantly reducing production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-point contact flatness testing device and its testing method, which aims to solve the problems of inconvenient installation, cumbersome position adjustment, and low detection efficiency of existing sensors.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: On one hand, the present invention provides a multi-point contact flatness testing device, comprising: a support frame, a testing platform, a testing module, a lifting mechanism, and a control system; the testing platform is disposed on the support frame and is used to place the workpiece to be tested; the testing module is located above the testing platform and includes a mounting plate and multiple contact displacement sensors, the mounting plate having multiple mounting holes arranged in a matrix, the contact displacement sensors being detachably connected to the mounting holes and used to acquire flatness data of the workpiece to be tested when in contact with it; the lower end of the lifting mechanism is connected to the support frame and located on one side of the testing platform, the upper end of the lifting mechanism being connected to the mounting plate; the control system is electrically connected to the lifting mechanism and the contact displacement sensors, and is used to control the lifting mechanism to move the mounting plate toward the workpiece to be tested until the contact displacement sensors contact the surface of the workpiece to be tested, and after receiving a contact signal from the contact displacement sensors, control the lifting mechanism to move the mounting plate away from the workpiece to be tested until it resets.

[0006] Furthermore, the control system includes a control switch, function buttons, and a display module. The control switch is used to turn the power supply on or off to the display module, the lifting mechanism, and the contact displacement sensor. The function buttons are used to control the movement of the lifting mechanism. The display module is used to receive and display the flatness data of the workpiece being measured.

[0007] Furthermore, the contact displacement sensor includes a connecting plate, a probe, a locking nut, and two pressing members. One end of each pressing member is connected through to both ends of the connecting plate and is detachably connected to the two mounting holes. One end of the probe is connected through to and movably connected to the connecting plate and is located between the two pressing members. The probe is threaded, and the locking nut is detachably connected to the thread to fix the probe.

[0008] Furthermore, the mounting hole includes an upper end and a lower end, the diameter of the lower end is larger than the diameter of the upper end, one end of the pressing member is provided with a plurality of retractable protrusions along the circumference, and the top of the pressing member is provided with a pressing part for controlling the extension and retraction of the protrusions, the protrusions being used to abut against the junction of the upper end and the lower end when extended.

[0009] Furthermore, a buffer spring is provided at one end of the probe.

[0010] Furthermore, the support frame is provided with a support plate and multiple positioning modules. The positioning modules are connected to the edge of the support plate. The support plate is used to support the detection stage, and the positioning modules are used to limit the position of the detection stage.

[0011] Furthermore, the lifting mechanism includes a motor, a transmission belt, and two slide rails. The transmission belt is vertically arranged, and the motor is driven to the transmission belt. The two slide rails are respectively arranged on both sides of the transmission belt. The mounting plate has two sliding parts on the side near the transmission belt corresponding to the two slide rails, and a fixing plate is bent between the two sliding parts. The two sliding parts are slidably connected to the two slide rails, and the fixing plate is fixedly connected to the transmission belt.

[0012] Furthermore, the multi-point contact flatness testing device also includes a protective cover, which is detachably mounted on the testing module.

[0013] On the other hand, the present invention also provides a testing method for a multi-point contact flatness testing device, comprising: The position of the contact displacement sensor corresponding to the workpiece under test is simulated on 3D software and a position map is generated. Insert and fix the contact displacement sensor onto the mounting plate according to the position diagram, and configure and save the contact displacement sensor's serial number and position information to the display module. Place the workpiece to be tested on the testing table, press the control switch to turn on the power to the display module, lifting mechanism and contact displacement sensor; The control lifting mechanism moves the mounting plate toward the workpiece being measured until the probe of the contact displacement sensor contacts the surface of the workpiece. After the control system receives the contact signal from the contact displacement sensor, it moves the mounting plate away from the workpiece until it is reset. The flatness data of the workpiece being measured is received and displayed through the display module.

[0014] Furthermore, inserting the contact displacement sensor into the mounting plate according to the position diagram includes: Insert the probe of each contact displacement sensor into the corresponding mounting hole according to the position diagram, and press the two pressing parts into the two adjacent mounting holes of the corresponding mounting hole; According to the location diagram, move the probe to adjust the length of the probe protruding from the corresponding mounting hole, and then fix the probe by tightening the lock nut.

[0015] This invention provides a multi-point contact flatness testing device and method. The device includes a support frame, a testing platform, a testing module, a lifting mechanism, and a control system. The testing platform is mounted on the support frame and is used to place the workpiece to be tested. The testing module is located above the testing platform and includes a mounting plate and multiple contact displacement sensors. The mounting plate has multiple mounting holes arranged in a matrix. The contact displacement sensors are detachably connected to the mounting holes and are used to acquire the flatness data of the workpiece when they contact it. The lower end of the lifting mechanism is connected to the support frame and is located on one side of the testing platform. The upper end of the lifting mechanism is connected to the mounting plate. The control system is electrically connected to the lifting mechanism and the contact displacement sensors. The control system controls the lifting mechanism to move the mounting plate towards the workpiece until the contact displacement sensors contact the surface of the workpiece. After receiving the contact signal from the contact displacement sensors, the control system controls the lifting mechanism to move the mounting plate away from the workpiece until it resets. This invention utilizes a matrix arrangement of mounting holes with multiple detachable contact displacement sensors, allowing for flexible adjustment of the sensor's installation position and number to adapt to workpieces of different specifications and testing requirements, thus solving the problem of poor adaptability in traditional devices. The lifting mechanism is linked to the control system, enabling automatic lifting of the detection module without manual operation, and automatically resetting after contact, significantly improving testing efficiency. Multi-point contact detection can simultaneously collect flatness data from multiple points on the workpiece, improving detection accuracy and avoiding the limitations of single-point detection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the multi-point contact flatness testing device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a contact displacement sensor provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of the workpiece being measured in a specific workpiece flatness measurement provided by the present invention; Figure 4 A schematic diagram of the first view of the positioning module in a specific workpiece flatness measurement provided by the present invention; Figure 5 A schematic diagram of the second perspective of a positioning module in a specific workpiece flatness measurement provided by the present invention; Figure 6 A schematic diagram of the third-view structure of a positioning module in a specific workpiece flatness measurement provided by the present invention; Figure 7 A schematic flowchart of the testing method for the multi-point contact flatness testing device provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of a sub-process of the testing method for the multi-point contact flatness testing device provided in an embodiment of the present invention.

[0018] Explanation of the markings in the image: 1. Support frame; 11. Support plate; 12. Positioning module; 2. Testing station; 3. Detection module; 31. Contact displacement sensor; 311. Connecting plate; 312. Probe; 313. Pressing element; 3131. Protrusion; 3132. Pressing part; 314. Thread; 32. Mounting plate; 321. Sliding part; 322. Fixing plate; 33. Mounting hole; 331. Upper end; 332. Lower end; 4. Lifting mechanism; 41. Transmission belt; 42. Slide rail; 5. Control system; 51. Control switch; 52. Function button; 53. Display module; 6. Protective cover. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] Combination Figure 1-2 As shown, the present invention provides a multi-point contact flatness testing device, comprising: a support frame 1, a testing platform 2, a testing module 3, a lifting mechanism 4, and a control system 5; the testing platform 2 is disposed on the support frame 1 and is used to place the workpiece to be tested (not shown); the testing module 3 is located above the testing platform 2 and includes a mounting plate 32 and multiple contact displacement sensors 31. The mounting plate 32 is provided with multiple mounting holes 33 arranged in a matrix. The contact displacement sensors 31 are detachably connected to the mounting holes 33 and are used to acquire the flatness data of the workpiece to be tested when they contact it; the lower end of the lifting mechanism 4 is connected to the support frame 1 and is located on one side of the testing platform 2, and the upper end of the lifting mechanism 4 is connected to the mounting plate 32; the control system 5 is electrically connected to the lifting mechanism 4 and the contact displacement sensors 31, and is used to control the lifting mechanism 4 to move the mounting plate 32 toward the workpiece to be tested until the contact displacement sensors 31 contact the surface of the workpiece to be tested, and after receiving the contact signal fed back by the contact displacement sensors 31, control the lifting mechanism 4 to move the mounting plate 32 away from the workpiece to be tested until it is reset.

[0024] In this embodiment of the invention, multiple mounting holes 33 arranged in a matrix are detachably connected to contact displacement sensors 31, allowing for flexible adjustment of the installation position and number of contact displacement sensors 31 to adapt to workpieces of different specifications and with different testing requirements, thus solving the problem of poor adaptability of traditional devices. The lifting mechanism 4 is linked with the control system 5 to realize the automatic lifting of the detection module 3 without manual operation, and it automatically resets after contact, greatly improving the testing efficiency. Multi-point contact detection can simultaneously collect flatness data of multiple points on the workpiece, improving the testing accuracy and avoiding the limitations of single-point detection. The overall structure is simple and easy to install, reducing the difficulty of equipment debugging and the cost of use, taking into account both practicality and economy, and is suitable for batch precision testing scenarios.

[0025] Specifically, the spacing between adjacent mounting holes 33 is consistent, and the diameter of the mounting holes 33 is set to correspond to that of the contact displacement sensor 31, which enables the contact displacement sensor 31 to be quickly disassembled and repositioned.

[0026] In some embodiments, the control system 5 includes a control switch 51, a function button 52, and a display module 53. The control switch 51 is used to turn the power supply on or off to the display module 53, the lifting mechanism 4, and the contact displacement sensor 31. The function button 52 is used to control the movement of the lifting mechanism 4. The display module 53 is used to receive and display the flatness data of the workpiece being measured.

[0027] In this embodiment, the control switch 51 integrates the power supply to all core components, making operation convenient and avoiding the cumbersome process of individually switching each component, thus improving operational efficiency. The function button 52 individually controls the movement of the lifting mechanism 4, allowing operators to flexibly control the lifting speed and stroke of the detection module 3 according to actual testing needs, thereby improving operational flexibility. The display module 53 receives and displays flatness data in real time, making the test results intuitive and easy for operators to quickly read and record data, reducing manual recording errors, and providing convenience for subsequent data traceability and analysis.

[0028] In some embodiments, the contact displacement sensor 31 includes a connecting plate 311, a probe 312, a locking nut (not shown), and two pressing members 313. One end of each pressing member 313 is connected through to both ends of the connecting plate 311 and is detachably connected to two mounting holes 33. One end of the probe 312 is connected through to and movably connected to the connecting plate 311 and is located between the two pressing members 313. The probe 312 is provided with a thread 314, and the locking nut is detachably connected to the thread 314 to fix the probe 312.

[0029] In this embodiment, two pressing members 313 cooperate with the connecting plate 311 to achieve a stable and detachable connection between the contact displacement sensor 31 and the mounting plate 32. Installation and disassembly are convenient, facilitating the maintenance, replacement, and position adjustment of the contact displacement sensor 31. The probe 312 is movable and fixed by a locking nut, allowing for flexible adjustment of the probe 312's protrusion length to adapt to workpieces of different thicknesses. This also ensures the stability of the contact between the probe 312 and the workpiece during testing, improving the accuracy of the test data. The probe 312 is located between the two pressing members 313, which provides some protection for the probe 312, reducing collision damage during testing and extending the service life of the contact displacement sensor 31.

[0030] In some specific embodiments, the mounting hole 33 includes an upper end 331 and a lower end 332. The diameter of the lower end 332 is larger than that of the upper end 331. One end of the pressing member 313 is provided with a plurality of retractable protrusions 3131 along the circumferential direction. The top of the pressing member 313 is provided with a pressing part 3132 for controlling the extension and retraction of the protrusions 3131. The protrusions 3131 are used to abut against the junction of the upper end 331 and the lower end 332 when extended.

[0031] In this embodiment, the mounting hole 33 adopts an upper and lower stepped structure, with the lower end 332 having a larger diameter than the upper end 331. Combined with the retractable protrusion 3131 of the pressing member 313, pressing it allows the protrusion 3131 to retract and insert into the mounting hole 33. Releasing it allows the protrusion 3131 to abut against the junction of the hole wall, achieving quick and secure locking. This further simplifies the installation operation of the contact displacement sensor 31 and improves installation efficiency. The pressing part 3132 can directly control the extension and retraction of the protrusion 3131, making the operation simple and easy to understand, requiring no additional tools and reducing the difficulty of operation for operators. The abutment structure at the junction of the protrusion 3131 and the mounting hole 33 ensures the stability of the connection of the pressing member 313, preventing the contact displacement sensor 31 from loosening during detection and ensuring the stability and reliability of the detection data.

[0032] In some specific embodiments, a buffer spring (not shown) is provided at one end of the probe 312.

[0033] In this embodiment, a buffer spring is provided at one end of the probe 312 to buffer the impact force when the probe 312 contacts the workpiece being measured, so as to avoid scratching the surface of the workpiece and damaging the probe 312 due to excessive contact pressure. At the same time, it can reduce the impact of vibration at the moment of contact on the detection data and improve the detection accuracy.

[0034] In some embodiments, the support frame 1 is provided with a support plate 11 and a plurality of positioning modules 12. The positioning modules 12 are connected to the edge of the support plate 11. The support plate 11 is used to support the detection table 2, and the positioning modules 12 are used to limit the position of the detection table 2.

[0035] In this embodiment, the support plate 11 provides stable support for the inspection table 2, ensuring that the inspection table 2 remains horizontal and stable during the inspection process, thus providing a foundation for accurate inspection. Multiple positioning modules 12 are set at the edge of the support plate 11, which can effectively limit the horizontal displacement of the inspection table 2, prevent the inspection table 2 from shifting during the inspection process, ensure the accurate inspection position of the workpiece being tested, and reduce inspection errors. The positioning modules 12 can be adapted to inspection tables 2 of different sizes, which is highly flexible and facilitates the installation, positioning, and disassembly of the inspection table 2, thereby improving the ease of use of the equipment.

[0036] In some embodiments, the lifting mechanism 4 includes a motor (not shown), a transmission belt 41, and two slide rails 42. The transmission belt 41 is vertically arranged, and the motor is connected to the transmission belt 41. The two slide rails 42 are respectively arranged on both sides of the transmission belt 41. The mounting plate 32 is provided with two sliding parts 321 on the side of the mounting plate 32 near the transmission belt 41, corresponding to the two slide rails 42. A fixing plate 322 is bent between the two sliding parts 321. The two sliding parts 321 are slidably connected to the two slide rails 42, and the fixing plate 322 is fixedly connected to the transmission belt 41.

[0037] In this embodiment, the lifting mechanism 4 adopts a structure of motor, transmission belt 41 and double slide rail 42, which can realize the smooth and uniform lifting of the mounting plate 32, avoid tilting and shaking during the lifting process, ensure the precise movement of the detection module 3, and improve the detection accuracy. The double slide rail 42 is symmetrically arranged, and together with the connection structure between the sliding part 321 and the fixed plate 322, it can enhance the stability of the mounting plate 32, avoid the mounting plate 32 from shifting during the detection process, and ensure the consistency of synchronous detection by multiple contact displacement sensors 31. The transmission structure is simple, has a low failure rate, is easy to maintain, and can flexibly adjust the lifting speed to adapt to different detection scenario requirements.

[0038] In some embodiments, the multi-point contact flatness testing device further includes a protective cover 6, which is detachably mounted on the testing module 3.

[0039] In this embodiment, the protective cover 6 is detachably installed on the detection module 3, which can effectively prevent dust, debris, water stains and other contaminants from entering the detection module 3, avoid contamination and damage to core components such as the contact displacement sensor 31 and the mounting plate 32, and extend the service life of the equipment; at the same time, it can prevent foreign objects from interfering with the detection of the contact displacement sensor 31 during the detection process, and ensure the accuracy of the detection data; the detachable design facilitates the maintenance, debugging and replacement of the contact displacement sensor 31 of the detection module 3, and takes into account both protection and ease of use.

[0040] Combination Figure 3-6 As shown, in a specific workpiece flatness measurement, according to Figure 3 The shape of the workpiece under test is simulated in 3D software to determine the position of the corresponding contact displacement sensor 31 and generate a position map. Figure 4 Each mounting hole 33 on the mounting plate 32 is marked with a number. According to the position diagram, insert each contact displacement sensor 31 into the corresponding mounting hole 33. Figure 5 and Figure 6 It is understood how the probe 312 of the contact displacement sensor 31 contacts the workpiece being measured, and after contact, obtains the flatness data of the workpiece being measured at the corresponding position of each contact displacement sensor 31.

[0041] Combination Figure 7 As shown, the present invention also provides a testing method for a multi-point contact flatness testing device, including steps S10 to S50: S10. Simulate the position of the contact displacement sensor 31 corresponding to the workpiece being measured on 3D software and generate a position map. S20. Insert and fix the contact displacement sensor 31 onto the mounting plate 32 according to the position diagram, and configure and save the numbering information and position information of the contact displacement sensor 31 to the display module 53. S30. Place the workpiece to be tested on the testing table 2, press the control switch 51 to turn on the power supply of the display module 53, the lifting mechanism 4 and the contact displacement sensor 31; S40. Control the lifting mechanism 4 to move the mounting plate 32 toward the workpiece being measured until the probe 312 of the contact displacement sensor 31 contacts the surface of the workpiece being measured. After the control system 5 receives the contact signal fed back by the contact displacement sensor 31, control the lifting mechanism 4 to move the mounting plate 32 toward the workpiece being measured until it is reset. S50. Receive and display the flatness data of the workpiece being measured through the display module 53.

[0042] In this embodiment of the invention, the sensor position is first simulated using 3D software to generate a position map, which can accurately plan the installation points of the contact displacement sensor 31, avoiding errors caused by manual planning, ensuring that the detection points cover the key areas of the workpiece, and improving detection accuracy. The contact displacement sensor 31's number and position information are configured and saved, facilitating subsequent data traceability and maintenance and replacement of the contact displacement sensor 31. At the same time, the detection parameters of different workpieces can be quickly called up, improving batch detection efficiency. The degree of automation is high, from power-on and lifting control to data display, no complex manual operation is required, reducing the labor intensity and operation difficulty of operators. After the detection is completed, it automatically resets, which can quickly enter the next detection, adapting to the continuous detection needs of batch workpieces and greatly improving production detection efficiency.

[0043] Combination Figure 8 As shown, in some embodiments, inserting the contact displacement sensor 31 onto the mounting plate 32 according to the position diagram includes steps S201~S202: S201. Insert the probe 312 of each contact displacement sensor 31 into the corresponding mounting hole 33 according to the position diagram, and press the two pressing parts 313 into the two adjacent mounting holes 33 of the corresponding mounting hole 33. S202. Adjust the length of the probe 312 protruding from the corresponding mounting hole 33 according to the position diagram, and fix the probe 312 by tightening the nut.

[0044] In this embodiment, the protrusion 3131 of the pressing component 313 enables the rapid and accurate installation and fixation of the contact displacement sensor 31, avoiding installation deviations and ensuring the accuracy of the detection position. The protrusion length of the probe 312 is adjusted according to the position diagram and the preset detection height of the workpiece, which can adapt to workpieces of different thicknesses and different detection requirements, improving the flexibility and adaptability of the detection. The probe 312 is fixed by tightening the nut to ensure that the position of the probe 312 is stable during the detection process, avoiding the distortion of detection data due to the loosening of the probe 312, and further improving the detection accuracy and reliability.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A multi-point contact flatness testing device, characterized in that, include: Supporting framework; A testing table, which is mounted on the support frame, is used to place the workpiece to be tested; The detection module is located above the detection table and includes a mounting plate and multiple contact displacement sensors. The mounting plate is provided with multiple mounting holes arranged in a matrix. The contact displacement sensors are detachably connected to the mounting holes and are used to acquire the flatness data of the workpiece being tested when they come into contact with the workpiece being tested. A lifting mechanism, the lower end of which is connected to the support frame and located on one side of the testing platform, and the upper end of which is connected to the mounting plate; The control system is electrically connected to the lifting mechanism and the contact displacement sensor. It is used to control the lifting mechanism to move the mounting plate toward the workpiece being measured until the contact displacement sensor contacts the surface of the workpiece being measured. After receiving the contact signal fed back by the contact displacement sensor, the control system controls the lifting mechanism to move the mounting plate away from the workpiece being measured until it is reset.

2. The multi-point contact flatness testing device according to claim 1, characterized in that, The control system includes a control switch, function buttons, and a display module. The control switch is used to turn the power supply on or off to the display module, the lifting mechanism, and the contact displacement sensor. The function buttons are used to control the movement of the lifting mechanism. The display module is used to receive and display the flatness data of the workpiece being measured.

3. The multi-point contact flatness testing device according to claim 1, characterized in that, The contact displacement sensor includes a connecting plate, a probe, a locking nut, and two pressing parts. One end of each pressing part is connected through to both ends of the connecting plate and is detachably connected to the two mounting holes. One end of the probe is connected through to and movably connected to the connecting plate and is located between the two pressing parts. The probe has threads, and the locking nut is detachably connected to the threads to fix the probe.

4. The multi-point contact flatness testing device according to claim 3, characterized in that, The mounting hole includes an upper end and a lower end. The diameter of the lower end is larger than that of the upper end. One end of the pressing member is provided with a plurality of retractable protrusions along the circumference. The top of the pressing member is provided with a pressing part for controlling the extension and retraction of the protrusions. The protrusions are used to abut against the junction of the upper end and the lower end when extended.

5. The multi-point contact flatness testing device according to claim 3, characterized in that, A buffer spring is provided at one end of the probe.

6. The multi-point contact flatness testing device according to claim 1, characterized in that, The support frame is provided with a support plate and multiple positioning modules. The positioning modules are connected to the edge of the support plate. The support plate is used to support the detection stage, and the positioning modules are used to limit the position of the detection stage.

7. The multi-point contact flatness testing device according to claim 1, characterized in that, The lifting mechanism includes a motor, a transmission belt, and two slide rails. The transmission belt is vertically arranged, and the motor is connected to the transmission belt. The two slide rails are respectively arranged on both sides of the transmission belt. The mounting plate has two sliding parts on the side of the mounting plate closest to the transmission belt, corresponding to the two slide rails. A fixing plate is bent between the two sliding parts. The two sliding parts are slidably connected to the two slide rails, and the fixing plate is fixedly connected to the transmission belt.

8. The multi-point contact flatness testing device according to claim 1, characterized in that, It also includes a protective cover, which is detachably mounted on the detection module.

9. A testing method for a multi-point contact flatness testing device, characterized in that, include: The position of the contact displacement sensor corresponding to the workpiece under test is simulated on 3D software and a position map is generated. Insert and fix the contact displacement sensor onto the mounting plate according to the position diagram, and configure and save the contact displacement sensor's serial number and position information to the display module. Place the workpiece to be tested on the testing table, press the control switch to turn on the power to the display module, lifting mechanism and contact displacement sensor; The control lifting mechanism moves the mounting plate toward the workpiece being measured until the probe of the contact displacement sensor contacts the surface of the workpiece. After the control system receives the contact signal from the contact displacement sensor, it moves the mounting plate away from the workpiece until it is reset. The flatness data of the workpiece being measured is received and displayed through the display module.

10. The testing method of the multi-point contact flatness testing device according to claim 9, characterized in that, The step of inserting the contact displacement sensor into the mounting plate according to the position diagram includes: Insert the probe of each contact displacement sensor into the corresponding mounting hole according to the position diagram, and press the two pressing parts into the two adjacent mounting holes of the corresponding mounting hole; According to the location diagram, move the probe to adjust the length of the probe protruding from the corresponding mounting hole, and then fix the probe by tightening the lock nut.

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