Motor detection turnover clamp and control method thereof

Abstract

The multiple embodiments of the specification relate to the technical field of detection equipment, and particularly to a motor detection turnover clamp and a control method thereof. The motor detection turnover clamp comprises a hanging bracket, a clamping arm and a clamping driving device. The hanging bracket has a horizontal arm and a vertical blocking arm. The clamping arm is slidingly installed on the horizontal arm. The clamping driving device is installed on the horizontal arm. The clamping driving device drives the clamping arm to slide along the horizontal arm. The vertical blocking arm is installed with a rotatable passive rotary disc. The clamping arm is installed with a rotatable active rotary disc. The clamping arm is installed with a rotary motor for driving the active rotary disc. The active rotary disc and the passive rotary disc are both provided with a pair of clamping blocks arranged in a V shape. A control box is installed on the horizontal arm. A controller is arranged in the control box. The clamping driving device and the rotary motor are connected with the controller.

Description

Technical Field

[0001] Several embodiments of this specification relate to the field of testing equipment technology, specifically to a motor testing flipping fixture and its control method. Background Technology

[0002] In the manufacturing and testing of electric motors, motor inspection and rotation are critical steps that directly impact the quality and performance of the final product. Traditional motor inspection equipment often lacks flexibility and precision, particularly in clamping and rotation control. For example, some traditional fixtures cannot adequately accommodate motors of different sizes and shapes, leading to low assembly efficiency. Furthermore, in motor rotation testing, the lack of effective sensors and control systems makes it difficult to accurately measure the motor's operating status at various angles, limiting the accuracy of fault diagnosis. Therefore, there is a need for fixture devices that can assist in the more efficient execution of motor assembly and inspection. Summary of the Invention

[0003] This specification describes a motor detection flipping fixture and its control method through several embodiments.

[0004] Firstly, embodiments of this specification provide a motor detection flipping fixture, comprising:

[0005] The device includes a hanger, a clamping arm, and a clamping drive mechanism. The hanger has a horizontal arm and a vertical stop arm. The clamping arm is slidably mounted on the horizontal arm, and the clamping drive mechanism is mounted on the horizontal arm. The clamping drive mechanism drives the clamping arm to slide along the horizontal arm.

[0006] The vertical stop arm is equipped with a rotatable passive rotating disk, and the clamping arm is equipped with a rotatable active rotating disk. The clamping arm is also equipped with a rotary motor for driving the active rotating disk. Both the active and passive rotating disks are provided with a pair of clamping blocks arranged in a V-shape.

[0007] A control box is installed on the cross arm, and a controller is installed inside the control box. The clamping drive device and the rotary motor are both connected to the controller.

[0008] Secondly, the embodiments of this specification provide a control method for the motor detection flipping fixture as described above. The rotational angular displacement, rotational speed, and rotational direction of the active rotary disk are all controllable; the clamping force of the clamping block is measurable; the motor to be tested is placed on the workpiece table; the vertical stop arm can be fixed; and the controller establishes a communication connection with the host computer.

[0009] The control method is executed by the controller, and the control method includes the following steps:

[0010] When the vertical stop arm and clamping arm are located on both sides of the motor to be tested, the system receives the positioning signal sent by the host computer and then controls the clamping drive device to clamp the motor to be tested with the clamping arm until the clamping force of the clamping block reaches the preset value.

[0011] When the hanger is hoisted to the testing station, it receives a rotation angle control signal sent by the host computer. Based on the rotation angle control signal, it controls the rotary motor to rotate to the angle corresponding to the rotation angle control signal at a preset rotation speed and direction.

[0012] When the test is completed, a release signal is received from the host computer, and then the clamping drive device is controlled to release the clamping arm from the motor to be tested.

[0013] Thirdly, embodiments of this specification provide an electronic device, including a processor and a memory;

[0014] The processor is connected to the memory;

[0015] The memory is used to store executable program code;

[0016] The processor runs a program corresponding to the executable program code stored in the memory to perform the method described in any of the above aspects.

[0017] Fourthly, embodiments of this specification provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the methods described in any of the above aspects.

[0018] The beneficial effects of the technical solutions provided in some embodiments of this specification include at least the following:

[0019] In several embodiments of this specification, the entire inspection process of the provided motor inspection and flipping fixture, from clamping and rotation to release, is automatically executed by the controller, reducing the need for manual intervention, improving work efficiency, and lowering the possibility of human error. The use of movable clamping blocks allows it to accommodate motor housings of different diameters. Through in-depth analysis of vibration data, including time-domain curve similarity evaluation and frequency-domain feature comparison, the system can detect subtle abnormalities in motor assembly. After uploading the vibration data analysis results to a host computer, managers can monitor the motor quality status on the production line in real time and further explore potential quality improvement points using big data analysis tools.

[0020] Other features and advantages of various embodiments of this specification will be further revealed in the following detailed description and accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this specification, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the motor testing and flipping fixture provided in the embodiments of this specification.

[0023] Figure 2 This is a schematic diagram of the motor testing and flipping fixture provided in the embodiments of this specification.

[0024] Figure 3 This is a front view of the motor testing and flipping fixture provided in the embodiments of this specification.

[0025] Figure 4 This is a schematic flowchart of the motor detection and flipping fixture control method provided in the embodiments of this specification.

[0026] Figure 5 This is a schematic diagram of vibration detection using a motor testing and flipping fixture provided in the embodiments of this specification.

[0027] Figure 6 A schematic diagram of the reference frequency composition provided for embodiments of this specification.

[0028] Figure 7 A schematic diagram of an electronic device provided in an embodiment of this specification.

[0029] Among them: 11. Lifting lug, 12. Hanger, 13. Control box, 14. Handrail, 15. Clamping arm, 21. Clamping drive device, 31. Passive rotary disk, 32. Clamping block, 33. Rotary motor, 34. Active rotary disk, 41. Housing, 42. Workpiece stage, 50. Reference frequency component, 51. Frequency component, 1100. Electronic equipment, 1101. Processor, 1102. Communication bus, 1103. User interface, 1104. Network interface, 1105. Memory. Detailed Implementation

[0030] The technical solutions of the embodiments of this specification will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of this specification and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this specification.

[0031] The terms "first," "second," "third," etc., in the description, claims, and accompanying drawings are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0032] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to facilitate the description of the embodiments and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0033] All data involved in this application are information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0034] Before introducing the technical solutions described in this manual, the application scenarios and related technologies of the technical solutions will be introduced.

[0035] In the manufacturing of new energy vehicles, the quality of the motor directly affects the manufacturing efficiency, overall performance, energy efficiency, and safety of the vehicle. This places higher demands on motor testing during the manufacturing process. Traditional motor testing equipment and technologies often struggle to meet these growing needs, particularly in terms of accuracy, automation, and adaptability. For example, traditional fixtures may not effectively handle the testing requirements of different motor models and specifications, leading to low assembly efficiency. Furthermore, during motor rollover testing, the lack of high-precision sensors and intelligent control systems makes it difficult to achieve a comprehensive and accurate assessment of the motor's operating status.

[0036] Therefore, this specification provides a motor-controlled detection and flipping fixture and its control method, which can automate clamping, flipping, and releasing operations. Throughout the process, the fixture can adjust the rotation angle, speed, and direction according to preset parameters, and monitor the clamping force in real time.

[0037] This manual first provides a motor testing and flipping fixture; please refer to the appendix. Figure 1 and appendix Figure 2The motor detection and tilting fixture includes a hanger 12, a clamping arm 15, and a clamping drive device 21. The hanger 12 has a horizontal arm and a vertical stop arm. The clamping arm 15 is slidably mounted on the horizontal arm, and the clamping drive device 21 is mounted on the horizontal arm, driving the clamping arm 15 to slide along the horizontal arm. The vertical stop arm is equipped with a rotatable passive rotating disk 31, and the clamping arm 15 is equipped with a rotatable active rotating disk 34. The clamping arm 15 is equipped with a rotary motor 33 for driving the active rotating disk 34. Both the active rotating disk 34 and the passive rotating disk 31 are provided with a pair of clamping blocks 32 arranged in a V-shape. A control box 13 is mounted on the horizontal arm, and a controller is provided inside the control box 13. The clamping drive device 21 and the rotary motor 33 are both connected to the controller. The horizontal arm is provided with lifting lugs 11 and handrails 14. The lifting lugs 11 are used for being lifted and transported by other equipment. If manual intervention is required during the transfer process, the handrail 14 facilitates manual operation.

[0038] The clamping block 32 has a built-in pressure sensor, and the active rotary disk 34 has an angular displacement sensor. Both the pressure sensor and the angular displacement sensor are connected to the controller. The pressure sensor detects the clamping force. The clamping drive device 21 can be a bidirectional cylinder, a servo linear motor, or a servo motor combined with a ball screw mechanism. A dovetail groove structure is recommended for the connection between the clamping arm 15 and the cross arm, ensuring sufficient connection strength, high precision, and easy lubrication. The controller does not need to obtain the precise position of the current clamping arm 15, but it does need to obtain the position of the stroke stop of the clamping arm 15. This can be achieved by setting a photoelectric gate or a micro switch at the stroke stop of the clamping arm 15.

[0039] Please see the appendix Figure 3 The clamping block 32 is rotatably mounted on the active rotating disk 34 and the passive rotating disk 31. The working surface of the clamping block 32 is covered with an anti-slip layer. An angular displacement sensor detects the angular displacement of the active rotating disk 34. As a recommended implementation, an absolute angular displacement sensor is used, which can obtain the angular displacement immediately after a power failure and restart, without the need to start counting from zero or perform additional calibration steps.

[0040] One method of using the motor testing flipping fixture provided in this embodiment includes:

[0041] The motor to be tested is placed on the workpiece table 42. The motor testing and tilting fixture is hoisted above the motor and its descent height is controlled so that the clamping block 32 is approximately positioned in the middle of the outer casing 41 of the motor, with the motor shaft vertically positioned. The clamping block 32 on the vertical stop arm contacts the outer casing 41 of the motor. Then, the clamping drive device 21 is controlled to bring the clamping arm 15 closer to the vertical stop arm, thus finally clamping the motor with the clamping block 32. The motor testing and tilting fixture is then lifted by a hoist, and the motor to be tested is raised.

[0042] The host computer communicates with the controller via a preset program or by receiving instructions from an interactive device. The controller then controls the rotation of the rotary motor 33, rotating the motor under test to different angles. This allows for manual inspection and observation of the motor's assembly at each angle, thus enabling the inspection of the motor's assembly quality.

[0043] On the other hand, this specification provides a control method for a motor detection flipping fixture as described above, wherein the rotational angular displacement, rotational speed and rotational direction of the active rotating disk 34 are controllable, the clamping force of the clamping block 32 is measurable, the motor to be tested is placed on the workpiece table 42, the vertical stop arm can be fixed, and the controller establishes a communication connection with the host computer.

[0044] The control method is executed by the controller; please refer to the appendix. Figure 4 The control method includes the following steps:

[0045] Step S1) When the vertical stop arm and clamping arm 15 are located on both sides of the motor to be tested, the system receives a positioning signal sent by the host computer, and then controls the clamping drive device 21 to clamp the motor to be tested with the clamping arm 15 until the clamping force of the clamping block 32 reaches a preset value. By continuously reading the clamping force of the clamping block 32, the system determines whether the preset value has been reached and can promptly trigger the stop clamping drive device 21.

[0046] Step S2) When the hanger 12 is hoisted to the inspection station, it receives a rotation angle control signal sent by the host computer. Based on the rotation angle control signal, it controls the rotary motor 33 to rotate to the angle corresponding to the preset rotation speed and direction. By rotating to different angles, multiple angle inspections are achieved, ensuring the quality of motor assembly.

[0047] Step S3) When the test is completed, receive the release signal sent by the host computer, and then control the clamping drive device 21 to release the clamping arm 15 from the motor to be tested.

[0048] On the other hand, in another embodiment, a vibration sensor is mounted on the cross arm and the vibration sensor is connected to the controller.

[0049] The control method further includes the following steps:

[0050] When the vertical arm is fixed, it receives a detection command sent by the host computer, and then controls the rotary motor 33 to drive the motor to be tested to rotate until the motor shaft is in a horizontal position.

[0051] The rotary motor 33 is controlled to drive the motor under test to oscillate back and forth at a set rotational speed within a predetermined angular displacement range for a preset duration. During this process, the detection data of the vibration sensor is collected and recorded as vibration data.

[0052] The rotary motor 33 is controlled to drive the motor under test to rotate until the motor shaft is vertical, and the vibration data is uploaded to the host computer.

[0053] Once the vertical stop arm is fixed, the fixture receives a detection command from the host computer. The control system starts the rotary motor 33, driving the motor under test to rotate until the motor shaft is in a horizontal position. Subsequently, the rotary motor 33 is controlled to reciprocate within a preset angular displacement range at a set rotational speed for a certain duration (e.g., 30 seconds or 1 minute), as shown in the attached diagram. Figure 5 As shown in the diagram. During this process, vibration data of the motor is collected in real time using vibration sensors, and the collected data is recorded as a vibration dataset. Spectral analysis of the vibration signals can effectively identify potential defects inside the motor, such as bearing wear, rotor imbalance, and assembly misalignment.

[0054] Especially when the assembly is not tight and there is looseness, the reciprocating vibration can clearly detect the abnormalities reflected in the vibration spectrum. This allows for the detection of assembly defects that are not visible on the surface or difficult to detect through measurement, ensuring the quality of the final motor product.

[0055] An alarm device is installed on the cross arm, and the control method further includes the following steps:

[0056] The similarity between the time-domain curve of the vibration data and a pre-stored reference curve is calculated. When the similarity is lower than a preset threshold, the alarm device is controlled to sound an alarm.

[0057] Extract the frequency domain features of the vibration data to obtain the frequency and amplitude of frequency component 51;

[0058] The frequency and amplitude of the frequency group 51 are compared with the preset reference frequency group 50;

[0059] When the difference between the amplitude of a certain frequency in the frequency composition 51 and the amplitude of the same frequency in the reference frequency composition 50 is less than a preset percentage, the comparison is determined to be consistent; when the difference between the amplitude of a certain frequency in the frequency composition 51 and the amplitude of the same frequency in the reference frequency composition 50 is not less than a preset percentage, the comparison is determined to be inconsistent.

[0060] When a discrepancy is found, the alarm device is activated.

[0061] The reference curve pre-stored in the system represents the curve corresponding to the vibration data collected when a rigorously tested and normal motor performs the same reciprocating oscillation. Please refer to the appendix. Figure 6 If the similarity between the calculated vibration data time-domain curve and the pre-stored reference curve is lower than a preset threshold (e.g., 70%), it indicates that the motor under test may have an assembly defect, triggering the alarm device to issue an alarm and prompting technicians to conduct further inspection.

[0062] The vibration data is subjected to a Fast Fourier Transform (FFT) to extract its frequency domain features, namely the frequencies and amplitudes of the 51 frequency components. If the vibration amplitude at a specific frequency (e.g., 60Hz) in the frequency domain features of the motor under test is significantly higher than the normal range, i.e., the amplitude difference exceeds a preset percentage (e.g., ±20%), the motor is considered to have a potential problem, such as bearing wear, rotor imbalance, or loose assembly, which will also trigger the alarm device. This helps to detect defects in the manufacturing process in a timely manner and can effectively prevent safety hazards caused by motor failures.

[0063] Please see Figure 7 The diagram shown is a structural schematic of an electronic device provided in an embodiment of this specification.

[0064] like Figure 7As shown, the electronic device 1100 may include: at least one processor 1101, at least one network interface 1104, a user interface 1103, a memory 1105, and at least one communication bus 1102. The communication bus 1102 can be used to connect and communicate with the various components mentioned above. The user interface 1103 may include buttons, and optionally may include standard wired or wireless interfaces. The network interface 1104 may include, but is not limited to, a Bluetooth module, an NFC module, or a Wi-Fi module. The processor 1101 may include one or more processing cores. The processor 1101 connects to various parts within the electronic device 1100 using various interfaces and lines, and performs various functions of the routing device and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 1105, and by calling data stored in the memory 1105. Optionally, the processor 1101 may be implemented using at least one hardware form of DSP, FPGA, or PLA. The processor 1101 may integrate one or more combinations of CPU, GPU, and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the content that the display screen needs to show; and the modem is used for wireless communication.

[0065] It is understandable that the aforementioned modem may not be integrated into the processor 1101, but may be implemented using a separate chip.

[0066] The memory 1105 may include RAM or ROM. Optionally, the memory 1105 may include a non-transitory computer-readable medium. The memory 1105 may be used to store instructions, programs, code, code sets, or instruction sets. The memory 1105 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-described method embodiments, etc.; the data storage area may store data involved in the above-described method embodiments, etc. Optionally, the memory 1105 may also be at least one storage device located remotely from the aforementioned processor 1101. As a computer storage medium, the memory 1105 may include an operating system, a network communication module, a user interface module, and application programs. The processor 1101 may be used to call the application programs stored in the memory 1105 and execute the methods in the above-described embodiments.

[0067] This specification also provides a computer-readable storage medium storing instructions that, when executed on a computer or processor, cause the computer or processor to perform multiple steps as described in the above embodiments. If the constituent modules of the above-described electronic device are implemented as software functional units and sold or used as independent products, they can be stored in the computer-readable storage medium.

[0068] This specification also provides a computer program product, including a computer program that, when executed by a processor, implements the multiple steps described in the above embodiments.

[0069] Where there is no conflict, the technical features in this embodiment and implementation scheme can be combined arbitrarily.

[0070] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes multiple computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this specification are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center integrating multiple available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital versatile discs (DVDs)), or semiconductor media (e.g., solid-state drives (SSDs)).

[0071] When implemented through hardware or firmware, the aforementioned method flow is programmed into the hardware circuit to obtain the corresponding hardware circuit structure and achieve the corresponding function. For example, a Programmable Logic Device (PLD) (such as a Field Programmable Gate Array (FPGA)) is such an integrated circuit, whose logic function is determined by the user programming the device. Designers can program a digital system onto a PLD themselves, eliminating the need for chip manufacturers to design and fabricate dedicated integrated circuit chips. Furthermore, nowadays, instead of manually fabricating integrated circuit chips, this programming is mostly implemented using "logic compiler" software, similar to the software compiler used in program development. The original code before compilation must also be written in a specific programming language, called a Hardware Description Language (HDL). There is not just one HDL, but many. Those skilled in the art should understand that by simply performing some logic programming on the method flow using one of the aforementioned hardware description languages ​​and programming it into an integrated circuit, the hardware circuit implementing the logic method flow can be easily obtained.

[0072] The embodiments described above are merely preferred embodiments of this specification and are not intended to limit the scope of this specification. Any modifications and improvements made by those skilled in the art to the technical solutions of this specification without departing from the spirit of this specification should fall within the protection scope defined by the claims of this specification.

Claims

1. A motor testing and flipping fixture, characterized in that, include: The device includes a hanger, a clamping arm, and a clamping drive mechanism. The hanger has a horizontal arm and a vertical stop arm. The clamping arm is slidably mounted on the horizontal arm, and the clamping drive mechanism is mounted on the horizontal arm. The clamping drive mechanism drives the clamping arm to slide along the horizontal arm. The vertical stop arm is equipped with a rotatable passive rotating disk, and the clamping arm is equipped with a rotatable active rotating disk. The clamping arm is also equipped with a rotary motor for driving the active rotating disk. Both the active and passive rotating disks are provided with a pair of clamping blocks arranged in a V-shape. A control box is installed on the cross arm, and a controller is installed inside the control box. The clamping drive device and the rotary motor are both connected to the controller. The rotational angular displacement, rotational speed, and rotational direction of the active rotary disk are all controllable; the clamping force of the clamping block is measurable; the motor to be tested is placed on the workpiece table; the vertical stop arm can be fixed; and the controller establishes a communication connection with the host computer. The controller executes a control method, which includes the following steps: When the vertical stop arm and clamping arm are located on both sides of the motor to be tested, the system receives the positioning signal sent by the host computer and then controls the clamping drive device to clamp the motor to be tested with the clamping arm until the clamping force of the clamping block reaches the preset value. When the hanger is hoisted to the testing station, it receives a rotation angle control signal sent by the host computer. Based on the rotation angle control signal, it controls the rotary motor to rotate to the angle corresponding to the rotation angle control signal at a preset rotation speed and direction. When the test is completed, a release signal is received from the host computer, and then the clamping drive device is controlled to release the clamping arm from the motor to be tested. A vibration sensor is mounted on the cross arm, and the vibration sensor is connected to the controller. The control method further includes the following steps: When the vertical stop arm is fixed, it receives a detection command sent by the host computer, and then controls the rotary motor to drive the motor to be tested to rotate until the motor shaft is in a horizontal position. The rotary motor is controlled to drive the motor under test to oscillate back and forth at a set rotational speed within a predetermined angular displacement range for a preset duration. During this process, the detection data of the vibration sensor is collected and recorded as vibration data. The rotary motor is controlled to drive the motor under test to rotate until the motor shaft is vertical, and the vibration data is uploaded to the host computer.

2. The motor testing and flipping fixture according to claim 1, characterized in that, The clamping block has a built-in pressure sensor, and the active rotating disk is equipped with an angular displacement sensor.

3. A motor testing and flipping fixture according to claim 1 or 2, characterized in that, The clamping block is rotatably mounted on the active rotating disk and the passive rotating disk.

4. The motor testing and flipping fixture according to claim 3, characterized in that, The working surface of the clamping block is covered with an anti-slip layer.

5. A motor testing and flipping fixture according to claim 1 or 2, characterized in that, The cross arm is equipped with lugs and handrails.

6. A motor testing and flipping fixture according to claim 1, characterized in that, An alarm device is installed on the cross arm, and the control method further includes the following steps: The similarity between the time-domain curve of the vibration data and a pre-stored reference curve is calculated. When the similarity is lower than a preset threshold, the alarm device is controlled to sound an alarm. Extract the frequency domain composition of the vibration data to obtain the frequency and amplitude of the frequency composition; The frequency and amplitude of the frequency composition are compared with a preset reference frequency composition; When the difference between the amplitude of a certain frequency in the frequency composition and the amplitude of the same frequency in the reference frequency composition is less than a preset percentage, the comparison is determined to be consistent; when the difference between the amplitude of a certain frequency in the frequency composition and the amplitude of the same frequency in the reference frequency composition is not less than a preset percentage, the comparison is determined to be inconsistent. When a discrepancy is found, the alarm device is activated.

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