Driving shaft pullout force measuring system

Abstract

The invention discloses a driving shaft pullout force measuring system, and relates to the field of sound production control and a detection machine shell, the top of the detection machine shell is provided with a hanging piece connected with hanging equipment, a plurality of supporting brackets are arranged in the detection machine shell in a sliding mode, and the detection machine shell is provided with a movement channel for the supporting brackets to move. A driving mechanism used for driving the supporting brackets on the two sides to move and detect is arranged in the detection machine shell. A supporting box body is fixedly installed at the bottom of the supporting bracket, and two replaceable clamping jaws are arranged in the supporting box body in a sliding mode. Through the arrangement of the detection machine shell, the supporting bracket, the driving mechanism, the replaceable clamping jaw and the distance adjusting mechanism, the supporting bracket can be driven by the driving mechanism to move, the replaceable clamping jaw is driven to move synchronously in the moving process of the supporting bracket, then force is applied to the driving shaft, the pull-out force detection work of the driving shaft is completed, manual detection is not needed, and the detection efficiency is improved. The labor intensity of operators is effectively reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle drive shaft pull-out force measurement, and more particularly to a drive shaft pull-out force measurement system. Background Technology

[0002] During vehicle operation, the drive shaft connects the gearbox reducer to the drive wheels and transmits torque, which directly affects the safety performance of the entire vehicle. Therefore, during the production process in the final assembly workshop, it is necessary to confirm whether the drive shaft is properly engaged in the gearbox spline slot.

[0003] Currently, the methods used are all manual inspection, which involves measuring the pull-out force of the drive shaft using wrenches and tooling. Since the wrenches and tooling are heavy, this increases the labor intensity of the operators and causes a significant decrease in production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a drive shaft pull-out force measurement system, which at least solves one of the technical problems of how to connect audio sources in a loop and how to support breakpoint playback to avoid delays, pop sounds, and other experiential issues.

[0005] This invention provides the following solution:

[0006] According to one aspect of the present invention, a drive shaft pull-out force measuring system is provided, including a detection housing, the top of the detection housing is provided with a hanging member connected to a suspension device, a plurality of support brackets are slidably arranged inside the detection housing, a movement channel for the support brackets to move is opened on the detection housing, and a drive mechanism for driving the support brackets on both sides to move and detect is provided inside the detection housing.

[0007] The bottom of the support bracket is fixedly installed with a support box. Two replaceable claws are slidably arranged inside the support box. The support box is provided with a spacing adjustment mechanism for driving the two replaceable claws to move closer or further apart.

[0008] By adopting the above technical solution, and by setting up a detection housing, support bracket, drive mechanism, replaceable jaws, and spacing adjustment mechanism, the spacing adjustment mechanism can drive the two replaceable jaws to move closer or further apart. When the replaceable jaws move closer together, they can clamp and fix the drive shaft to ensure the stability of subsequent detection work. The drive mechanism can drive the support bracket to move, and during the movement of the support bracket, the replaceable jaws will move synchronously, thereby applying a pull-out force to the drive shaft and completing the pull-out force detection work of the drive shaft. No manual inspection is required, which effectively reduces the labor intensity of operators, eliminates the risk of workpieces hitting hands when using wrenches manually, improves safety, and improves efficiency.

[0009] Furthermore, the drive mechanism includes a second bidirectional lead screw rotatably mounted inside the detection housing. A mounting box is mounted on the side of the detection housing via a connecting box. A servo motor is fixedly mounted inside the mounting box. The output shaft of the servo motor and the second bidirectional lead screw are both rotatably mounted on the connecting box, and the end of the second bidirectional lead screw is fixedly connected to the output shaft of the servo motor. The support bracket is threaded onto the outer surface of the second bidirectional lead screw.

[0010] Furthermore, several guide shafts are installed inside the detection housing around the second bidirectional lead screw, and the support bracket is slidably disposed on the outer surface of the several guide shafts.

[0011] Furthermore, the spacing adjustment mechanism includes a bidirectional lead screw 1 rotatably mounted inside the support box. A bearing mounting seat is mounted on the side of the support box via a connecting seat, and a drive motor is fixed inside the bearing mounting seat. The output shaft of the drive motor and the bidirectional lead screw 1 are both rotatably mounted on the connecting seat, and the output shaft of the drive motor is fixedly connected to the end of the bidirectional lead screw 1. A strip-shaped channel for the movement of replaceable claws is opened on the support box, and the two replaceable claws are respectively threaded onto the outer surface of two sections of threads on the bidirectional lead screw 1.

[0012] Furthermore, a linear guide rail assembly is installed inside the detection housing, and both replaceable jaws are fixedly connected to the moving parts of the linear guide rail assembly.

[0013] Furthermore, the replaceable jaw consists of a clamping plate and a fixed base. The clamping plate is detachably mounted on the fixed base by bolts. The fixed base is threaded onto the outer surface of the bidirectional lead screw and is fixedly connected to the moving part of the linear guide assembly.

[0014] Furthermore, a laser displacement sensor for measuring the relative displacement value of the replaceable claw is installed on the support bracket, and a reflector for use in conjunction with the laser displacement sensor is provided on the support bracket.

[0015] Furthermore, a force sensor for measuring the applied tensile force is installed between the detection housing and the support bracket.

[0016] Furthermore, a claw origin sensing bracket that works in conjunction with the replaceable claw is fixedly installed at the bottom of the support box.

[0017] An operating method for measuring drive shaft pull-out force, used in the operating method of the drive shaft pull-out force measuring system according to any one of claims 1-9, includes:

[0018] S1. Placing the workpiece: The workpiece with the drive shaft enters the measuring station, and the pull-out force measuring system is automatically lowered to the pre-lowering height by external hoisting equipment.

[0019] S2. Manual placement inspection: The inspection housing is adjusted up and down by external suspension equipment, so that the inspection housing drives the replaceable claws to move up and down synchronously, and drives the replaceable claws to the position of the drive shaft inspection.

[0020] S3. Measurement system start-up: The drive motor is turned on by controlling the drive motor. The drive motor drives the bidirectional lead screw to rotate. The rotation of the bidirectional lead screw drives the two interchangeable jaws to move closer to each other. The two interchangeable jaws move closer to each other to clamp and fix the drive shaft.

[0021] S4. Pull-out test: When the two replaceable claws on both sides approach each other and the drive shaft is fixed and tightened, the servo motor is turned on. The servo motor will drive the two-way lead screw to rotate, which will drive the support brackets on both sides to move relative to the support box. The movement of the support box will cause the replaceable claws to move synchronously. A preset tension is applied to the replaceable claws, and then the relative displacement value of the two replaceable claws is measured.

[0022] S5. Data Judgment: The applied tension is measured by a force sensor and compared with the tension set by the PLC and the host computer to ensure the tension accuracy requirements. The displacement distance is judged by a laser displacement sensor. If the displacement value is less than the set standard value, it is judged as qualified (OK). If it is greater than these set values, it is judged as unqualified (NG).

[0023] The above solution achieves the following beneficial technical effects:

[0024] This application addresses the problem of high labor intensity in manually measuring drive shaft pull-out force. It employs hardware structures such as force sensors, laser displacement sensors, and replaceable jaws, and develops a system suitable for measuring drive shaft pull-out force by uploading and comparing sensor information through a PLC program. This system enables online detection of drive shaft pull-out force, using force sensors to measure the applied tension and comparing it with the tension set by the PLC and host computer to ensure tension accuracy. This reduces the labor intensity of workers, improves the overall production efficiency of the vehicle, and significantly reduces the assembly cost of the entire vehicle.

[0025] This application measures the relative displacement of the replaceable jaws using a laser displacement sensor with a measurement accuracy of ±0.01mm. It eliminates the need for manual testing of pull-out force using wrenches and tooling; pull-out force measurement can be achieved simply by pressing an operation button, greatly improving measurement efficiency. At the same time, it eliminates the risk of workpiece injury to the hand when using a wrench manually, thus improving safety.

[0026] This application incorporates a testing housing, a support bracket, a drive mechanism, replaceable jaws, and a spacing adjustment mechanism. The spacing adjustment mechanism allows the two replaceable jaws to move closer or further apart. When the replaceable jaws move closer together, they clamp and fix the drive shaft, ensuring the stability of subsequent testing. The drive mechanism moves the support bracket, causing the replaceable jaws to move synchronously, thereby applying a pull-out force to the drive shaft and completing the pull-out force test. This eliminates the need for manual testing and effectively reduces the operator's workload.

[0027] This application sets up a drive motor and a bidirectional lead screw. The drive motor drives the bidirectional lead screw to rotate, and the rotation of the bidirectional lead screw causes the replaceable jaws on both sides to move closer or further apart, thereby adjusting the distance between the replaceable jaws. The replacement jaws on both sides moving closer together can stabilize the drive shaft. At the same time, adjusting the distance between the replaceable jaws on both sides can accommodate drive shafts of different specifications, thus improving the applicability.

[0028] This application sets the replaceable jaw as a fixed base and clamping plate. During use, the clamping plate on the replaceable jaw can be disassembled and replaced by bolts. This allows for the replacement of clamping plates of different specifications according to different usage requirements, in order to meet different clamping needs. At the same time, it also facilitates the disassembly and replacement of the clamping plate on the replaceable jaw when it is damaged, so as to avoid affecting the subsequent work. Attached Figure Description

[0029] Figure 1 This is a front view structural diagram of a drive shaft pull-out force measurement system provided by one or more embodiments of the present invention.

[0030] Figure 2 This is a test cross-sectional structural diagram of a drive shaft pull-out force measurement system provided in one or more embodiments of the present invention.

[0031] Figure 3 This is a top view of a drive shaft pull-out force measurement system provided in one or more embodiments of the present invention.

[0032] Figure 4 This is a front cross-sectional view of a drive shaft pull-out force measurement system provided in one or more embodiments of the present invention.

[0033] The components include: 1. Detector housing; 2. Hanging component; 3. Connecting housing; 4. Mounting housing; 5. Servo motor; 6. Support housing; 7. Claw origin sensing bracket; 8. Replaceable claw; 9. Bearing mounting base; 10. Connecting base; 11. Drive motor; 12. Bidirectional lead screw one; 13. Support bracket; 14. Linear guide rail assembly; 15. Fixing base; 16. Laser displacement sensor; 17. Bidirectional lead screw two; 18. Force sensor; 19. Guide shaft; 20. Reflector. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described 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.

[0035] Figures 1-4 This is a structural diagram of a drive shaft pull-out force measurement system provided in one or more embodiments of the present invention.

[0036] like Figures 1-4 The drive shaft pull-out force measurement system shown includes:

[0037] The testing housing 1 has a hanging component 2 on its top that is connected to the suspension equipment. Multiple support brackets 13 are slidably arranged inside the testing housing 1. The testing housing 1 has a movement channel for the support brackets 13 to move. The testing housing 1 also has a drive mechanism inside for driving the support brackets 13 on both sides to move and detect.

[0038] A support box 6 is fixedly installed at the bottom of the support bracket 13. Two replaceable claws 8 are slidably arranged inside the support box 6. The support box 6 is equipped with a spacing adjustment mechanism for driving the two replaceable claws 8 to move closer or further apart. A claw origin sensing bracket 7 that works with the replaceable claws 8 is fixedly installed at the bottom of the support box 6.

[0039] By setting up a testing housing 1, a support bracket 13, a drive mechanism, replaceable jaws 8, and a spacing adjustment mechanism, the spacing adjustment mechanism can drive the two replaceable jaws 8 to move closer or further apart. When the replaceable jaws 8 move closer together, they can clamp and fix the drive shaft to ensure the stability of subsequent testing work. The drive mechanism can drive the support bracket 13 to move. During the movement of the support bracket 13, the replaceable jaws 8 will move synchronously, thereby applying a pulling force to the drive shaft and completing the pull-out force testing of the drive shaft. No manual testing is required, which effectively reduces the labor intensity of the operator, eliminates the risk of the workpiece hitting the hand when using a wrench manually, improves safety, and improves efficiency.

[0040] Furthermore, such as Figure 4 As shown, the drive mechanism includes a bidirectional lead screw 17 rotatably mounted inside the detection housing 1. A mounting box 4 is mounted on the side of the detection housing 1 via a connecting box 3. A servo motor 5 is fixedly mounted inside the mounting box 4. The output shaft of the servo motor 5 and the bidirectional lead screw 17 are both rotatably mounted on the connecting box 3, and the end of the bidirectional lead screw 17 is fixedly connected to the output shaft of the servo motor 5. The support bracket 13 is threaded onto the outer surface of the bidirectional lead screw 17.

[0041] By setting a servo motor 5 and a bidirectional lead screw 17, the servo motor 5 drives the bidirectional lead screw 17 to rotate. The rotation of the bidirectional lead screw 17 can drive the support brackets 13 on both sides to move relative to the support box 6. The movement of the support box 6 causes the replaceable claws 8 to move synchronously. By measuring the relative displacement value between the two replaceable claws 8, if the displacement value is less than the set standard value, it is judged as qualified; if it is greater than these set values, it is judged as unqualified.

[0042] Furthermore, such as Figure 2 As shown, inside the housing 1 of the testing machine, several guide shafts 19 are installed around the bidirectional lead screw 17, and the support bracket 13 is slidably disposed on the outer surface of the several guide shafts 19.

[0043] By setting the guide shaft 19, the support bracket 13 is limited and guided by the guide shaft 19, which effectively avoids the problem of the support bracket 13 shaking and deviating during the detection process, thereby improving the stability of the support bracket 13 and further improving the stability of the movement of the replaceable claw 8. This effectively avoids the situation where the force causes tilting and deviation during the detection process, resulting in inaccurate detection.

[0044] Furthermore, such as Figure 2 As shown, the spacing adjustment mechanism includes a bidirectional lead screw 12 rotatably installed inside the support housing 6. A bearing mounting seat 9 is installed on the side of the support housing 6 via a connecting seat 10, and a drive motor 11 is fixed inside the bearing mounting seat 9. The output shaft of the drive motor 11 and the bidirectional lead screw 12 are both rotatably installed on the connecting seat 10, and the output shaft of the drive motor 11 is fixedly connected to the end of the bidirectional lead screw 12. A strip-shaped channel for the movement of replaceable claws 8 is provided on the support housing 6, and the two replaceable claws 8 are respectively threaded onto the outer surfaces of the two sections of threads on the bidirectional lead screw 12.

[0045] By setting up a drive motor 11 and a bidirectional lead screw 12, the drive motor 11 drives the bidirectional lead screw 12 to rotate. The rotation of the bidirectional lead screw 12 drives the replaceable jaws 8 on both sides to move closer or further apart, thereby adjusting the distance between the replaceable jaws 8. Driving the replaceable jaws 8 on both sides to move closer together can stabilize the drive shaft. At the same time, adjusting the distance between the replaceable jaws 8 on both sides can accommodate drive shafts of different specifications, thus improving the applicability.

[0046] Furthermore, such as Figure 2 As shown, a linear guide rail assembly 14 is installed inside the testing housing 1, and two replaceable jaws 8 are fixedly connected to the moving parts of the linear guide rail assembly 14.

[0047] By setting the linear guide rail assembly 14, the linear guide rail assembly 14 can position and guide the replaceable claw 8, so as to avoid the replaceable claw 8 from shaking or deviating during movement, ensuring the stability of its movement path and improving the accuracy of detection.

[0048] Furthermore, such as Figure 2 As shown. The replaceable jaw 8 consists of a clamping plate and a fixed base 15. The clamping plate is detachably mounted on the fixed base 15 by bolts. The fixed base 15 is threaded onto the outer surface of the bidirectional lead screw 12, and the fixed base 15 is fixedly connected to the moving part of the linear guide assembly 14.

[0049] By setting the replaceable jaw 8 as a fixed base 15 and a clamping plate, the clamping plate on the replaceable jaw 8 can be disassembled and replaced by bolts during use. This allows for the replacement of clamping plates of different specifications according to different usage requirements to meet different clamping needs. At the same time, it also facilitates the disassembly and replacement of the clamping plate on the replaceable jaw 8 when it is damaged, thus avoiding affecting subsequent work.

[0050] Furthermore, such as Figure 2 and Figure 3 As shown, a laser displacement sensor 16 for measuring the relative displacement value of the replaceable claw 8 is installed on the support bracket 13, and a reflector 20 for cooperating with the laser displacement sensor 16 is provided on the support bracket 13.

[0051] By setting up a laser displacement sensor 16 and a reflector 20, the laser displacement sensor 16 measures the relative displacement value of the replaceable claw 8, so that the measurement accuracy can be controlled within ±0.01mm, further ensuring the accuracy of the detection. The reflector 20 can enhance the reflection intensity of the laser signal. The laser displacement sensor 16 judges the displacement distance. If the displacement value is less than the set standard value, it is judged as qualified (OK). If it is greater than these set values, it is judged as unqualified (NG).

[0052] Meanwhile, the reflector 20 can provide a uniform and predictable reflective surface, reducing the impact of ambient light interference and surface material differences on the measurement, thereby further improving the accuracy and stability of the laser displacement sensor 16 measurement.

[0053] Furthermore, such as Figure 4 As shown, a force sensor 18 for measuring the applied tension is installed between the detection housing 1 and the support bracket 13.

[0054] By setting a force sensor 18, the applied tensile force is measured and compared with the tensile force set by the PLC and the host computer, ensuring the tensile force accuracy requirements. Compared with manual detection, the overall accuracy of the detection can be greatly improved.

[0055] like Figures 1-4 The method for measuring the pull-out force of a drive shaft, as shown, includes:

[0056] S1. Placing the workpiece: The workpiece with the drive shaft enters the measuring station, and the pull-out force measuring system is automatically lowered to the pre-lowering height by external hoisting equipment.

[0057] S2, Manual placement inspection: The inspection housing 1 is adjusted up and down by external suspension equipment, so that the inspection housing 1 drives the replaceable claw 8 to move up and down synchronously, and drives the replaceable claw 8 to the position of the drive shaft inspection.

[0058] S3. Measurement system start: The drive motor 11 is turned on by controlling the drive motor 11. The drive motor 11 drives the bidirectional lead screw 12 to rotate. The rotation of the bidirectional lead screw 12 drives the two interchangeable jaws 8 to move closer to each other. The two interchangeable jaws 8 move closer to each other to clamp and fix the drive shaft.

[0059] S4. After the interchangeable jaws 8 approach each other and the drive shaft is fixed and tightened, the servo motor 5 is turned on. The servo motor 5 will drive the bidirectional lead screw 17 to rotate, which will drive the support brackets 13 on both sides to move the support box 6 relative to each other. The movement of the support box 6 will cause the interchangeable jaws 8 to move synchronously, apply a preset tension to the interchangeable jaws 8, and then measure the relative displacement value of the two interchangeable jaws 8.

[0060] S5. Data Judgment: The applied tension is measured by the force sensor 18 and compared with the tension set by the PLC and the host computer to ensure the tension accuracy requirements. The displacement distance is judged by the laser displacement sensor 16. If the displacement value is less than the set standard value, it is judged as qualified (OK). If it is greater than these set values, it is judged as unqualified (NG).

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drive shaft pull out force measurement system characterized by, The utility model provides a detection machine, including detection machine shell (1), the top of detection machine shell (1) is equipped with the hanger (2) connected with suspension equipment, the inside of detection machine shell (1) is equipped with a plurality of support bracket (13) sliding, the upper of detection machine shell (1) is equipped with the movement passageway for the movement of support bracket (13), and the inside of detection machine shell (1) is equipped with the drive mechanism for driving both sides support bracket (13) to move detection, The bottom of support bracket (13) is fixedly installed with support box (6), the inside of support box (6) is equipped with two replaceable clamping claws (8) sliding, and the inside of support box (6) is equipped with spacing adjustment mechanism for driving two replaceable clamping claws (8) to be close to each other or away from each other.

2. The drive shaft pull out force measurement system of claim 1, wherein, The drive mechanism includes two-way screw No. 2 (17) rotatably installed in the inside of detection machine shell (1), the side of detection machine shell (1) is installed with mounting box (4) through connecting box (3), the inside of mounting box (4) is fixedly installed with servo motor (5), the output shaft of servo motor (5) and two-way screw No. 2 (17) are rotatably installed on connecting box (3), and the end of two-way screw No. 2 (17) is fixedly connected with the output shaft of servo motor (5), and support bracket (13) is threadedly installed on the outer surface of two-way screw No. 2 (17).

3. The drive shaft pull out force measurement system of claim 2, wherein, The inside of detection machine shell (1) is installed with a plurality of guide shafts (19) around two-way screw No. 2 (17), and support bracket (13) is slidably arranged on the outer surface of a plurality of guide shafts (19).

4. The drive shaft pull out force measurement system of claim 1, wherein, The spacing adjustment mechanism includes two-way screw No. 1 (12) rotatably installed in the inside of support box (6), the side of support box (6) is installed with bearing mounting seat (9) through connecting seat (10), and the inside of bearing mounting seat (9) is fixedly provided with drive motor (11), the output shaft of drive motor (11) and two-way screw No. 1 (12) are rotatably installed on connecting seat (10), and the output shaft of drive motor (11) is fixedly connected with the end of two-way screw No. 1 (12), and support box (6) is provided with strip-shaped passageway for the movement of replaceable clamping claw (8), and two replaceable clamping claws (8) are threadedly installed on the outer surfaces of two sections of threads of two-way screw No. 1 (12) respectively.

5. The drive shaft pull out force measurement system of claim 4, wherein, The inside of detection machine shell (1) is installed with linear guide rail assembly (14), and two replaceable clamping claws (8) are fixedly connected with the moving parts of linear guide rail assembly (14).

6. The drive shaft pull out force measurement system of claim 5, wherein, The replaceable clamping claw (8) is composed of a clamping plate and a fixed seat (15), the clamping plate is detachably installed on the fixed seat (15) by bolts, the fixed seat (15) is threadedly installed on the outer surface of two-way screw No. 1 (12), and the fixed seat (15) is fixedly connected with the moving part of linear guide rail assembly (14).

7. The drive shaft pull out force measurement system of claim 2, wherein, The support bracket (13) is installed with a laser displacement sensor (16) for measuring the relative displacement value of the replaceable clamping claw (8), and the support bracket (13) is provided with a reflecting plate (20) used in cooperation with the laser displacement sensor (16).

8. The drive shaft pull out force measurement system of claim 2, wherein, The force sensor (18) for measuring the applied tension is installed between the detection housing (1) and the support bracket (13).

9. The drive shaft pull out force measurement system of claim 5, wherein, The bottom of the support box body (6) is fixedly installed with a jaw origin sensing support (7) used in cooperation with the replaceable jaw (8).

10. A method of operating a drive shaft pull out force measurement, characterized by, The operation method of the drive shaft pull-out force measuring system according to any one of claims 1-9, comprising: S1, placing a workpiece: the workpiece with a drive shaft enters the measuring station, and the pull-out force measuring system is automatically lowered to a predetermined height by an external hoisting device; S2, manual placement detection: the detection housing (1) is adjusted to move up and down as a whole by an external suspension device, so that the detection housing (1) drives the replaceable jaw (8) to move up and down synchronously, and the replaceable jaw (8) is placed at the drive shaft detection position; S3, start the measuring system: start the drive motor (11), rotate the bidirectional lead screw (12) by the drive motor (11), and drive the two replaceable jaws (8) to approach each other to clamp and fix the drive shaft; S4, pull test: after the two replaceable jaws (8) approach each other to fix and tighten the drive shaft, the servo motor (5) is controlled to start, the bidirectional lead screw (17) is rotated by the servo motor (5), the two support brackets (13) drive the support box body (6) to move relatively, the support box body (6) moves to drive the replaceable jaw (6) to displace synchronously, a preset tension is applied to the replaceable jaw (8), and then the displacement values of the two replaceable jaws (8) are measured; S5, data judgment: the tension applied is measured by the force sensor (18) and compared with the tension set by the PLC and the upper computer to ensure the tension accuracy requirement, the displacement distance is judged by the laser displacement sensor (16), and if the displacement value is less than the set standard value, it is determined to be qualified, and if it is greater than the set value, it is determined to be unqualified.

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