Sealing Performance Detection Device for Rubber Seals Applicable to Linear Guide Rails

Abstract

The present invention discloses a sealing performance detection device applicable to rubber seals for linear guides, which relates to the technical field of sealing performance detection and optimizes the process of the linear guide function test. Specifically, it is manifested as follows: Two workpieces to be tested are arranged on both sides of the action crankshaft. By setting a number of eccentric action positions on the action crankshaft, it is mainly used to limit the setting positions of the rotation point A and the connection point B, so that one end of the pneumatic connecting rod performs an eccentric rotation action through the action crankshaft. When maintaining the horizontal sliding of the workpiece to be tested, the application requirements of different force directions can be simulated, and when the action crankshaft completes a single complete rotation, it can promote the workpiece to be tested to perform two reciprocating motions, which is mainly used to shorten the test time. The key content lies in: Based on the current value of the drive motor assembly as a reference condition, and complementary analysis is carried out with the error ratio calculated from the pressure value, temperature value and vibration frequency, so as to judge the state of the sealing performance.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing performance detection, and particularly relates to a sealing performance detection device applicable to rubber seals of linear guides. Background Art

[0002] Seals in linear guides are usually made of materials such as rubber, nylon, polyurethane, etc. These materials have good wear resistance and sealing performance. The rubber seal in the linear guide plays a role in preventing dust and debris from entering the inside of the slider, thereby protecting the normal operation of the guide rail.

[0003] Factors affecting the operation effect of the linear guide include sealing resistance, frictional resistance, etc. Taking the sealing resistance as an example, specifically, the sealing performance of the seal in it is detected by a relevant functional testing machine. The relevant content in the publication number CN117367786A can be referred to. Its essence is that multiple reciprocating motions are required, and relevant motion data is collected synchronously. The sealing performance is analyzed and judged based on the motion data. The overall process takes a long time, and the experimental function is relatively single;

[0004] In addition, it should also be noted that although the linear guide can only move along its length direction, the direction of the force acting on it is not limited to its length direction, resulting in differences in the degree of force during the actual operation of the linear guide. The conventional experimental function machine is mainly based on a reciprocating motion structure. For this, the present application proposes a solution. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing performance detection device applicable to rubber seals of linear guides. For the detection process of the performance of the seal in the linear guide, the conventional experimental function machine is mainly based on the reciprocating motion of the linear guide. The overall process takes a long time, and because the motion form is relatively single, it cannot fully simulate the operating environment of the linear guide, and the experimental function is relatively single.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A sealing performance detection device applicable to rubber seals of linear guides, including a machine body shell and a workpiece to be tested. An action crankshaft and a driving motor assembly are arranged in the machine body shell, and both ends of the action crankshaft are installed on the output end of the driving motor assembly;

[0007] The workpiece to be tested is arranged at both ends of the action crankshaft in a manner perpendicular to the length direction of the action crankshaft. An air-operated connecting rod is arranged between the workpiece to be tested and the action crankshaft, and both ends of the air-operated connecting rod are rotatably connected to the action crankshaft and the workpiece to be tested;

[0008] A plurality of eccentric action positions are provided on the action crankshaft, the center points of the plurality of eccentric action positions are not on the same axis, and the center point of the eccentric action position and the center point position of the output end of the drive motor assembly are not on the same axis;

[0009] An integrated detection module related to a plurality of workpieces to be measured and a drive motor assembly is provided on the body shell, and the integrated detection module includes a temperature sensor applied to the workpiece to be measured, a vibration frequency sensor, a current detector applied to the drive motor assembly, and a pressure sensor applied to the pneumatic connecting rod.

[0010] It is further set that: the rotation point of the drive motor assembly and the action crankshaft is set as A, and the connection point between the eccentric action position in the action crankshaft and one end position of the pneumatic connecting rod is set as B.

[0011] It is further set that: one of the workpieces to be measured arranged on both sides of the eccentric action position in the action crankshaft is set as the single-direction part, and the other workpiece to be measured arranged on both sides of the eccentric action position in the action crankshaft is set as the complementary part, and the sliding directions of the workpieces to be measured in the single-direction part and the complementary part are opposite.

[0012] It is further set that: the integrated detection module performs complementary analysis actions on the pressure values, current values, temperature values, and vibration frequencies in the complementary part and the single-direction part, and respectively sets the pressure value, current value, temperature value, and vibration frequency as Ft, It, Tt, and Qt, and according to the single-direction part and the complementary part, Ft is split into: Ft z and Ft y 、Tt z and Tt y as well as Qt z and Qt y , and the constant current value Io in the drive motor assembly is set.

[0013] It is further set that: error ratio calculations are performed on Ft z and Ft y 、Tt z and Tt y 、Qt z and Qt y as well as Io and It, and are respectively represented by MF, MT, MQ, and MI, and according to the specific values of Ft z and Ft y 、Tt z and Tt y 、Qt z and Qt y as well as Io and It, it is restricted that MF, MT, MQ, and MI only take values greater than 1.

[0014] Further set as: Set the intermediate coefficient 1.09 based on the error ratio of MI, and set the following state analysis results according to the intermediate coefficient 1.09:

[0015] State 1: When 1 < MI < 1.09, it indicates that the sealing performance of the workpiece to be tested is in a better state;

[0016] State 2: When MI > 1.09, it indicates that the sealing performance of the workpiece to be tested is in a defective state, and simultaneously mark MF, MT, and MQ to determine the detailed state of the workpiece to be tested.

[0017] The present invention has the following beneficial effects:

[0018] 1. For the functional test process of the linear guide rail, convert the rotational movement of the action crankshaft into the linear movement of the workpiece to be tested. Specifically, use the pneumatic connecting rod as the connecting structure between the workpiece to be tested and the action crankshaft. By setting several eccentric action positions on the action crankshaft, mainly used to limit the setting positions of the rotation point A and the connection point B, the position of one end of the pneumatic connecting rod can perform eccentric rotational movement through the action crankshaft, which can simulate the application requirements of different force directions, and further optimize the eccentric action positions on the action crankshaft. The workpiece to be tested is symmetrically arranged along the action crankshaft. One complete rotational movement of the action crankshaft can promote the workpiece to be tested to perform two reciprocating movements, mainly used to shorten the test time;

[0019] 2. Based on the above content, in the overall experimental process, use the current value in the drive motor assembly as the reference condition, and then combine the pressure value, temperature value, and vibration frequency to perform the analysis and calculation process of multiple error ratios. Specifically, based on the error ratio of the current value and combined with the error ratios of the pressure value, temperature value, and vibration frequency for complementary analysis. On the basis of shortening the test cycle, on the basis of determining and analyzing the sealing performance of the linear guide rail, detailed state analysis can also be performed, and multiple groups of functional test processes can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a structural schematic diagram of a sealing performance detection device for a rubber seal of a linear guide rail proposed by the present invention;

[0022] Figure 2 For the sealing performance detection device for a rubber seal of a linear guide rail proposed by the present inventionFigure 1 Partial disassembly diagram;

[0023] Figure 3 Schematic structural diagram of the action crankshaft in the sealing performance detection device for the rubber seal of the linear guide rail proposed by the present invention;

[0024] Figure 4 In the sealing performance detection device for the rubber seal of the linear guide rail proposed by the present invention Figure 3 Top view;

[0025] Figure 5 Lateral schematic diagram of the corresponding rotation point A and connection point B in the action crankshaft of the sealing performance detection device for the rubber seal of the linear guide rail proposed by the present invention;

[0026] Figure 6 Schematic structural diagram of the pneumatic connecting rod in the sealing performance detection device for the rubber seal of the linear guide rail proposed by the present invention.

[0027] In the figure: 1, body shell; 2, drive motor assembly; 3, action crankshaft; 301, eccentric action position; 4, pneumatic connecting rod; 5, workpiece to be tested. Specific embodiments

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1: For the detection process of the performance of the seal in the linear guide rail, the conventional experimental function machine is mainly based on the reciprocating motion of the linear guide rail. The overall process takes a long time, and because the motion form is relatively single, it cannot fully simulate the operating environment of the linear guide rail, and the experimental functionality is relatively single. Therefore, the following technical solutions are proposed:

[0030] Referring to Figures 1 - 6 , the sealing performance detection device for the rubber seal of the linear guide rail in this embodiment includes a body shell 1 and a workpiece 5 to be tested. An action crankshaft 3 and a drive motor assembly 2 are arranged in the body shell 1, and both ends of the action crankshaft 3 are installed on the output end of the drive motor assembly 2;

[0031] The workpiece 5 to be tested is arranged at both ends of the action crankshaft 3 in a manner perpendicular to the length direction of the action crankshaft 3. A pneumatic connecting rod 4 is arranged between the workpiece 5 to be tested and the action crankshaft 3, and both ends of the pneumatic connecting rod 4 are rotatably connected to the action crankshaft 3 and the workpiece 5 to be tested;

[0032] A plurality of eccentric action positions 301 are provided on the action crankshaft 3. The center points of the plurality of eccentric action positions 301 are not on the same axis, and the center point of the eccentric action position 301 and the center point position of the output end of the drive motor assembly 2 are not on the same axis;

[0033] An integrated detection module related to a plurality of workpieces 5 to be measured and the drive motor assembly 2 is provided on the body shell 1. The integrated detection module includes a temperature sensor applied to the workpiece 5 to be measured, a vibration frequency sensor, a current detector applied to the drive motor assembly 2, and a pressure sensor applied to the pneumatic connecting rod 4.

[0034] Basic principle: The operating principle of the linear guide is to achieve low-friction and high-precision linear motion through the rolling contact between the slider and the guide rail. The linear guide is mainly composed of a guide rail and a slider. The guide rail is usually long and has a high flatness and smoothness after precision machining; the slider is installed on the guide rail and contacts the guide rail surface through rolling elements (such as balls or rollers) to achieve low-friction linear motion. The main function of the seal in the linear guide is to prevent external impurities such as dust, oil, and water vapor from entering the inside of the guide rail, thereby protecting machine parts from damage, extending the service life of the machine, and ensuring the high precision and efficient operation of the machine. On the basis of maintaining the sealing performance, the seal will also generate a large resistance to the sliding process between the slider and the guide rail. This part is one of the key factors affecting the running stability of the linear guide. For this reason, the present invention proposes relevant content, specifically, actively forming a reciprocating motion mode of the linear guide and detecting relevant parameters for the linear guide in the reciprocating motion mode. Specifically, a temperature sensor and a vibration frequency sensor are used to detect the real-time temperature and vibration frequency during the operation of the linear guide respectively. Among them, the temperature parameter reflects the frictional resistance between the slider and the guide rail. When the slider and the guide rail perform multiple reciprocating motions, frictional heat is generated due to the frictional resistance; the vibration frequency is mainly used to feedback the stability when the slider and the guide rail perform reciprocating motions. If there is an obvious gap between the surfaces of the slider and the guide rail, or there are defects in the seal between them, it will cause an obvious vibration feeling between the slider and the guide rail. Therefore, the operating condition of the linear guide can be preliminarily judged by the two parameters of temperature and vibration frequency;

[0035] However, the present invention mainly focuses on the sealing performance of the seal in the linear guide. When improving the sealing performance between the slider and the guide rail, it will also increase the frictional resistance between the guide rail and the slider. For this reason, the present invention still takes the reciprocating motion between the slider and the guide rail as the basis;

[0036] However, the difference is that: Refer to Figure 5 and Figure 3, specifically, the pneumatic link 4 is used as the connection structure between the action crankshaft 3 and the workpiece to be measured 5, and the guide rail in the workpiece to be measured 5 is installed at the corresponding position. The driving motor assembly 2 drives the action crankshaft 3 to rotate at a constant speed. There are multiple action eccentric positions 301 on the action crankshaft 3, and one end of the pneumatic link 4 is connected to the action eccentric position 301 on the action crankshaft 3 and maintains a rotational connection. Thus, it can be understood that the position of one end of the pneumatic link 4 rotates along the position of the transmission shaft of the driving motor assembly 2. Taking Figure 5 as an example, the position of the other end of the pneumatic link 4 pulls the slider in the workpiece to be measured 5 to reciprocate on the guide rail. For the reciprocating motion of the workpiece to be measured 5 in the present invention, the force direction of the slider is not limited to the horizontal direction. Instead, the force angle of the pneumatic link 4 is further set by the eccentricity when the action eccentric position 301 rotates relative to the action crankshaft 3, so that the application requirements under different conditions can be simulated. However, the overall process can still drive the workpiece to be measured 5 to perform a small reciprocating motion;

[0037] And further explanation for the pneumatic link 4: The essence of the pneumatic link 4 can refer to the oil cylinder structure. Taking Figure 6 as an example, there are two air nozzle ports arranged at the lower side position of the pneumatic link 4, and the pneumatic link 4 is composed of a sliding sleeve and a sliding rod. Air chambers corresponding to the two air nozzle ports are opened inside the sliding sleeve and the sliding rod. When the pneumatic link 4 undergoes relative displacement under the eccentric rotation of the action crankshaft 3, the gas in one of the air chambers is compressed, so the pressure in this air chamber increases. It should be further explained that: if the friction resistance generated between the slider and the guide rail by the seal in the workpiece to be measured 5 is relatively large, the compression degree of this air chamber further increases, so the pressure in this air chamber further increases. Thus, the sealing performance in the workpiece to be measured 5 can also be feedback according to the pressure change in the pneumatic link 4;

[0038] Combined with the above content, it is further explained that: The overall action crankshaft 3 is provided with kinetic energy by the motor drive assembly 2. Presupposing the situation of "the best sealing performance, and the friction resistance between the seal and the slider and the guide rail is negligible or even non-existent", the rotation process of the action crankshaft 3 will not bear the resistance from the workpiece to be measured 5. Therefore, it can be further understood that: On the basis of not considering motor aging, unstable voltage, and heat dissipation effect, when the load changes, it causes an obvious fluctuation in the current value. Combining with the relevant content in the present invention, it can be understood and explained that: When the friction resistance caused by the seal in the workpiece to be measured 5 is relatively large, it causes an increase in the load of the driving motor assembly 2, so the current value in the driving motor assembly 2 changes significantly. Combining with the pressure change, temperature value, and vibration frequency in the above pneumatic linkage 4, the sealing performance of the workpiece to be measured 5 is judged.

[0039] Embodiment 2: Supplementary description of the installation position of the workpiece to be measured 5 in combination with the technical content in Embodiment 1:

[0040] The installation position of the workpiece 5 to be measured is directly related to the eccentric action position 301. Two workpieces 5 to be measured are connected to one eccentric action position 301. Under the action of the same action crankshaft 3, the two workpieces 5 to be measured can perform synchronous actions. For specific manifestations, refer to Figure 5 the following description: When the action crankshaft 3 rotates clockwise, the rotation point of the action crankshaft 3 is A, and the connection point of the pneumatic connecting rod 4 and the action crankshaft 3 is B. The workpiece 5 to be measured at the left position is driven by the action crankshaft 3. It can be indirectly understood that the connection point B of the workpiece 5 to be measured at the left position rotates counterclockwise along the rotation point A. Therefore, the slider in the workpiece 5 to be measured at the left position moves linearly along the direction from left to right on the guide rail. During this process, the connection point B of the workpiece 5 to be measured at the right position rotates clockwise along the rotation point A. Therefore, the slider in the workpiece 5 to be measured at the right position moves linearly along the direction from right to left on the guide rail. Thus, the connection points B in the two pneumatic connecting rods 4 jointly complete a 360° rotation action. When the action crankshaft 3 rotates 180°, the two workpieces 5 to be measured jointly complete a reciprocating motion, specifically corresponding to the single-direction part and the complementary part. After the two workpieces 5 to be measured perform a single-direction movement, complementary analysis actions are performed based on the pressure value in the pneumatic connecting rod 4, the current value in the drive motor assembly 2, the temperature value in the workpiece 5 to be measured, and the vibration frequency.

[0041] Embodiment 3: Combining the relevant content in Embodiment 1 and Embodiment 2, the operation process of the integrated detection module is described as follows:

[0042] S1: Let Ft, It, Tt, and Qt represent the pressure value, current value, temperature value, and vibration frequency respectively. First, the pressure value Ft is described: As shown in Embodiment 1, the pressure values in the two air chambers of the pneumatic connecting rod 4 are equal in the initial state. When the workpieces 5 to be measured in the single-direction part and the complementary part move synchronously, the gas in one of the air chambers of the pneumatic connecting rod 4 is compressed, so the pressure value Ft therein increases. Thus, the pressure value, temperature value, and vibration frequency can be further split into: Ft z and Ft y , Tt z and Tt y as well as Qt z and Qt y . And Ft z and Ft y are used for description. They represent the pressure values in the single-direction part and the complementary part respectively, and so on;

[0043] S2: Since the moving directions of the workpieces 5 to be measured in the single-direction part and the complementary part are opposite but the moving strokes are equal, if the overall workpiece 5 to be measured is in the best state, the Ftz and Ft y 、Tt z and Tt y and Qt z and Qt y The error is very small or even non - existent. For this complementary analysis operation, it is also necessary to further set the constant current value Io in the drive motor assembly 2. When the action crankshaft 3 rotates at a constant speed, synchronously obtain the error ratios of the associated pressure value, temperature value, vibration frequency, and current value. Specifically, it is expressed as MF = Ft z / Ft y 、MT = Tt z / Tt y 、MQ = Qt z and Qt y and MI = Io / It, and it is necessary to limit MF, MT, MQ, and MI to only take values greater than 1 according to the specific values of Ft z and Ft y 、Tt z and Tt y 、Qt z and Qt y and Io and It;

[0044] S3: Based on the technology in S2, conduct a judgment operation on the complementary analysis operation again, specifically as follows:

[0045] S3 - 1: Set the intermediate coefficient 1.09 based on the error ratio of MI. A simple explanation of 1.09 is that since there must be frictional resistance between the slider and the guide rail in the workpiece 5 to be measured, the drive motor assembly 2 is always in a loaded state, so Io in the drive motor assembly 2 is less than It. Therefore, take 0.09 as the error value. When 1 < MI < 1.09, it indicates that the sealing performance of the workpiece 5 to be measured is in a better state;

[0046] When MI > 1.09, synchronously record MF, MT, MQ. First, determine that the sealing performance of the workpiece 5 to be measured is in a defective state, and then conduct a detailed state judgment on the workpiece 5 according to the specific values of MF, MT, MQ.

[0047] S4: Combined with the relevant content in S3, it is explained that: Synchronously record the number of rotations of the action crankshaft 3 when a better state or a defective state appears. The more the number of rotations of the action crankshaft 3 when a better state or a defective state appears, the further it indicates that the sealing performance of the workpiece 5 to be measured is better.

[0048] In summary, the optimization of the linear guide function test process is specifically manifested as follows: Two workpieces to be tested are arranged on both sides of the action crankshaft. By setting a number of eccentric action positions on the action crankshaft, which are mainly used to limit the setting positions of the rotation point A and the connection point B, one end position of the pneumatic connecting rod performs an eccentric rotation action through the action crankshaft. When maintaining the horizontal sliding of the workpiece to be tested, the application requirements of different force directions can be simulated. And when the action crankshaft completes a single full rotation, it can promote the workpiece to be tested to perform two reciprocating motions, which is mainly used to shorten the test time. The key content lies in: taking the current value of the drive motor assembly as the basis for reference, and performing complementary analysis on the error ratio calculated from the pressure value, temperature value, and vibration frequency, so as to determine the state of the sealing performance.

[0049] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them. As long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should fall within the protection scope of the present invention.

[0050] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0051] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art of this technology can understand and utilize the present invention well. The present invention is only limited by the claim book and its full scope and equivalents.

Claims

1. A sealing performance testing device for a linear guide rail rubber seal, comprising a housing (1) and a workpiece to be tested (5), characterized in that: An operating crankshaft (3) and a drive motor assembly (2) are arranged in the machine body shell (1), and both ends of the operating crankshaft (3) are mounted on the output ends of the drive motor assembly (2); The workpiece (5) to be measured is arranged at two end positions of the working crankshaft (3) in a manner perpendicular to the length direction of the working crankshaft (3); a pneumatic connecting rod (4) is arranged between the workpiece (5) to be measured and the working crankshaft (3); and the two end positions of the pneumatic connecting rod (4) are rotatably connected to the working crankshaft (3) and the workpiece (5) to be measured; The action crankshaft (3) is provided with a plurality of eccentric action positions (301), the center points of the plurality of eccentric action positions (301) are not on the same axis, and the center point of the eccentric action position (301) and the center point of the output end of the drive motor assembly (2) are not on the same axis; An integrated detection module associated with a plurality of workpieces to be tested (5) and a drive motor assembly (2) is provided on the body shell (1), wherein the integrated detection module comprises a temperature sensor applied on the workpieces to be tested (5), a vibration frequency sensor, a current detector applied on the drive motor assembly (2), and a pressure sensor applied on the pneumatic connecting rod (4).

2. The sealing performance detection device for a linear guide rail rubber seal according to claim 1, characterized in that: The rotation point of the driving motor assembly (2) and the action crankshaft (3) is set to A, and the connection point between the eccentric action position (301) in the action crankshaft (3) and one end of the pneumatic connecting rod (4) is set to B.

3. The sealing performance detection device for a linear guide rail rubber seal according to claim 2, characterized in that: One of the workpieces to be measured (5) disposed at both sides of the eccentric action position (301) in the action crankshaft (3) is set as a one-way portion, and the other workpiece to be measured (5) disposed at both sides of the eccentric action position (301) in the action crankshaft (3) is set as a complementary portion, and the sliding directions of the workpieces to be measured (5) in the one-way portion and the complementary portion are opposite.

4. The sealing performance detection device for a linear guide rail rubber seal according to claim 3, characterized in that: The integrated detection module performs complementary analysis on the pressure value, current value, temperature value and vibration frequency in the complementary part and the unidirectional part, and sets the pressure value, current value, temperature value and vibration frequency to Ft, It, Tt and Qt respectively, and splits Ft, Tt and Qt into: Ft according to the unidirectional part and the complementary part. z and Ft. y , Tt z and Tt y and Qt z and Qt y , and set the constant current value Io in the drive motor assembly (2).

5. The sealing performance detection device for a linear guide rail rubber seal according to claim 4, characterized in that: Ft z and Ft. y , Tt z and Tt y , Qt z and Qt y The error ratios of Io and It are calculated and expressed as MF, MT, MQ and MI respectively, and the error ratios of Io and It are calculated according to Ft z and Ft. y , Tt z and Tt y , Qt z and Qt y As well as the specific values ​​of Io and It, limit MF, MT, MQ and MI to values ​​greater than 1.

6. The sealing performance detection device for linear guide rail rubber seals according to claim 5, characterized in that: The intermediate coefficient is set to 1.09 based on the error ratio of MI, and the following state analysis results are set according to the intermediate coefficient 1.09: State 1: When 1<MI<1.09, it indicates that the sealing performance of the workpiece (5) to be tested is in a better state; State 2: When MI>1.09, it indicates that the sealing performance of the workpiece (5) to be tested is in a defective state, and MF, MT, and MQ are synchronously marked to determine the detailed state of the workpiece (5) to be tested.

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