Testing machine and method for quality detection and judgment of micro direct current motor

Abstract

The invention discloses a testing machine and method for quality detection and judgment of a micro direct current motor. The testing machine comprises at least one micro direct current motor detection device, a device base and a micro direct current motor conveying device. The micro direct current motor detection device comprises a clamping motor pneumatic claw, an electricity testing copper sheet and a condenser microphone; the micro direct current motor detection device is fixed on the device base; the micro direct current motor conveying device comprises a motor classification baffle and a conveying belt; the micro direct-current motor conveying device is positioned below the micro direct-current motor detection device; according to the invention, the sound signal and the current signal of the micro direct current motor can be automatically collected, the micro direct current motor is automatically put into the corresponding area of the micro direct current motor conveying device according to the collected instruction, and then the micro direct current motor is conveyed out by the conveying belt, so that the purpose of automatically classifying the micro direct current motor is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of production, manufacturing and testing of micro DC motors. More specifically, the present invention relates to a testing machine and method for quality detection and judgment of micro DC motors. Background Art

[0002] In the mass production of micro DC motors, factories often use manual listening to inspect motors for quality before they leave the factory to prevent defective products from entering the market. This method, which uses manual listening to determine if there are abnormal noises during motor operation and detect motor faults, is subject to subjective judgment by workers and lacks a unified, quantitative evaluation metric for diagnosing motor signals. Manual listening is costly, inefficient, and produces inconsistent results. Furthermore, single-sensor detection methods suffer from low accuracy and limited detection range. Therefore, it is essential to replace this method with multi-sensor automated testing equipment.

[0003] The existing research on the quality detection method and system of DC micro motor based on current signal (Huang Pufang. Research on the quality detection method and system of DC micro motor based on current signal [D]. Yanshan University, 2024.) explains that in the actual production of most small and medium-sized motor enterprises, the factory quality inspection of motors is basically completed by manual inspection, and the document only studies the algorithm and host computer software for judging the fault of micro DC motor products, and does not develop automated equipment for detecting product faults. Summary of the Invention

[0004] The purpose of the present invention is to provide a testing machine and method for detecting and judging the quality of a micro DC motor.

[0005] The present invention is achieved through at least one of the following technical solutions.

[0006] A testing machine for micro DC motor quality inspection and judgment includes at least one micro DC motor inspection device, a device base and a micro DC motor conveying device; the micro DC motor inspection device is fixed on the device base; the micro DC motor conveying device is located below the micro DC motor inspection device; when the motor product to be inspected passes the inspection of the micro DC motor inspection device, it is placed in the micro DC motor conveying device.

[0007] Furthermore, the micro DC motor detection device includes a stepper motor, sound insulation cotton, a motor clamping claw, a current measuring copper sheet, a proximity switch limiter, a proximity switch, a synchronous pulley, a synchronous belt, a synchronous belt connecting the claw device and a limit device;

[0008] The synchronous belt connecting air claw device includes a connecting shaft; the clamping motor air claw includes an upper clamping motor air claw and a lower clamping motor air claw;

[0009] The stepper motor is fixed in the motor fixing frame, and the sound insulation cotton is provided on the fixing plates on both sides of the motor fixing frame; the current measuring copper sheet is fixed on one side of the motor fixing frame, and is located in front of the stepper motor; the upper air gripper for clamping the motor and the lower air gripper for clamping the motor are fixed on one side of the motor fixing frame, and are located in front of the upper and lower sides of the current measuring copper sheet; the motor product to be tested is placed in the lower air gripper for clamping the motor;

[0010] The proximity switch is fixed on one side of the motor fixing frame and is located in front of the upper air gripper of the clamping motor; the proximity switch limit plate is fixed on one side of the proximity switch and is close to the upper air gripper of the clamping motor; the proximity switch limit plate and the proximity switch are aligned and arranged at a position where the openings of the upper air gripper of the clamping motor and the lower air gripper of the clamping motor are parallel to the horizontal line, which facilitates the installation work before the micro DC motor is tested;

[0011] The synchronous belt connecting air claw device is fixed on the outside of the motor fixing frame, and the limit device is fixed on the outside of the motor fixing frame and is located on the outside of the synchronous belt, thereby preventing the movement of the connected synchronous belt and achieving the limiting effect;

[0012] The stepper motor is connected to a synchronous pulley; the synchronous pulley is connected to a synchronous belt and moves together; at the same time, the synchronous belt is connected to a synchronous belt-connected air gripper device; the synchronous belt is connected to a connecting shaft in the air gripper device, and the connecting shaft is connected to the mounting plates of the upper air gripper of the clamping motor and the lower air gripper of the clamping motor; at the same time, the mounting plate is connected to a proximity switch limit plate;

[0013] The stepper motor drives the synchronous pulley to rotate, and the synchronous pulley drives the synchronous belt to move at the same time. At the same time, the movement of the synchronous belt drives the connecting shaft of the synchronous belt-connected air gripper device to rotate. The mounting plates of the upper air gripper of the clamping motor and the lower air gripper of the clamping motor connected to the connecting shaft of the synchronous belt-connected air gripper device also drive the clamping motor air gripper to rotate. At the same time, the proximity switch limit plate connected to the mounting plates of the upper air gripper of the clamping motor and the lower air gripper of the clamping motor also makes the same movement.

[0014] Since the proximity switch limit plate is limited by the proximity switch and the synchronous belt is limited by the limit device, the entire rotating mechanism or the stepper motor output shaft can only rotate within a certain range.

[0015] Furthermore, a condenser microphone is provided in the micro DC motor detection device. The condenser microphone is fixed on one side of the motor fixing frame and is located between the upper air claw of the clamping motor and the lower air claw of the clamping motor to collect sound signals when the micro DC motor is running.

[0016] Furthermore, there are two electrical measuring copper sheets, which are respectively connected to the positive and negative poles of the voltage-stabilized power supply, and a distance is set between the two copper sheets.

[0017] Furthermore, an arc groove is provided in the lower air gripper of the clamping motor, and the motor product to be tested is placed in the arc groove in the lower air gripper of the clamping motor.

[0018] Furthermore, the limiting device is a blocking limiting piece.

[0019] Furthermore, the micro DC motor transmission device includes a conveyor belt, a conveyor motor and a conveyor; the conveyor device includes a conveyor frame, the conveyor belt is located on the conveyor frame, and the conveyor motor is used to drive the conveyor belt to perform transmission movement.

[0020] Furthermore, a motor classification baffle is provided on the conveyor frame, and the motor classification baffle divides the conveyor belt into two areas, representing a good motor area and an unqualified motor area respectively.

[0021] Furthermore, a distance is left between the motor classification baffle and the rotation travel path of the clamping motor air claw.

[0022] The detection and judgment method of a testing machine for detecting and judging the quality of a micro DC motor includes the following steps:

[0023] Step S1: After the micro DC motor is placed in the clamping motor air gripper, the clamping motor air gripper clamps the motor. At this time, the end terminal of the micro DC motor is in contact with the measuring copper sheet, and the motor signal is ready to be measured;

[0024] Step S2: The voltage-stabilized power supply supplies power to the current measuring copper sheet, causing the micro DC motor to operate. The condenser microphone collects the sound signal of the motor while the current measuring copper sheet collects the current signal of the motor. Both signals are simultaneously uploaded to the host computer.

[0025] Step S3: The host computer software analyzes the collected motor sound signal and current signal, and gives a judgment result to the stepper motor in the micro DC motor detection device according to the signal situation. According to the result, the stepper motor drives the synchronous belt, thereby driving the clamping motor air gripper to rotate a corresponding angle;

[0026] Step S4: When the air gripper for the motor to be clamped rotates to a corresponding angle, the air gripper for the motor to be clamped opens and lowers the clamped micro DC motor, causing the motor to fall into the micro DC motor conveying device; wherein the air gripper for the motor to be clamped rotates at two angles, and stops at two ends of the motor classification baffle in the micro DC motor conveying device, respectively, to achieve the purpose of classifying the motors;

[0027] Step S5: the micro DC motor conveying device starts the conveyor belt to transport the placed and classified micro DC motors out, and at the same time, the motor clamping claws in the micro DC motor detection device return to their original positions.

[0028] Compared with the existing invention, the beneficial effects of the present invention are:

[0029] (1) There are multiple sets of micro DC motor detection devices, which can detect the quality of six micro DC motors at the same time with high efficiency.

[0030] (2) The micro DC motor detection device uses a stepper motor to rotate and clamp the motor air gripper to simply classify the micro DC motor with low cost and high speed.

[0031] (3) An integrated micro DC motor transmission device is used, and only one motor classification baffle is used to achieve regional classification of motors. The micro DC motors are transported using an integrated conveyor belt, which is highly efficient and low-cost.

[0032] (4) The micro DC motor detection device is equipped with a capacitor microphone and a current measuring copper sheet, which can simultaneously collect the sound signal and current signal of the micro DC motor. Multi-sensor signal collection makes the operating status of the micro DC motor clearer.

[0033] (5) The micro DC motor detection device is equipped with a proximity switch, which can effectively prevent errors when the motor clamping claw returns to its original position, thereby damaging the device and causing danger.

[0034] (6) The host computer can collect, process, display and store sound signals and current signals, and then give instructions to the stepper motor of the micro DC motor detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a testing machine for detecting and judging the quality of a micro DC motor according to an embodiment of the present invention.

[0036] Figure 2 The present invention is an overall front view of a testing machine for detecting and judging the quality of a micro DC motor according to an embodiment.

[0037] Figure 3 The figure is an overall top view of a testing machine for detecting and judging the quality of a micro DC motor according to an embodiment.

[0038] Figure 4 The figure is an overall side view of a testing machine for detecting and judging the quality of a micro DC motor according to an embodiment.

[0039] Figure 5 It is a schematic diagram of the three-dimensional structure of the micro DC motor detection device of the embodiment.

[0040] Figure 6 It is a front view of the micro DC motor detection device of the embodiment.

[0041] Figure 7 1. It is a top view of the micro DC motor detection device of the embodiment.

[0042] Figure 8 It is a side view of the micro DC motor detection device of the embodiment.

[0043] Figure 9 Schematic diagram of the rotation of the clamping motor air claw in the embodiment. DETAILED DESCRIPTION

[0044] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0045] like Figures 1 to 4 As shown, this embodiment provides a testing machine for micro DC motor quality detection and judgment, including at least one micro DC motor detection device 1, a device base 4 and a micro DC motor transmission device; the micro DC motor detection device 1 is fixed on the device base 4; the micro DC motor transmission device is located below the micro DC motor detection device 1.

[0046] The micro-DC motor conveyor device includes a conveyor belt 2, a motor sorting baffle 3, a conveyor motor 5, and a conveyor. The conveyor device includes a conveyor frame, on which the conveyor belt 2 is located. The conveyor motor 5 drives the conveyor belt 2 for transmission. The motor sorting baffle 3 is fixed to the conveyor frame and divides the conveyor belt 2 into two areas, representing a good motor area and a bad motor area.

[0047] For the micro DC motor detection device, the specific range of its internal rotational motion is the micro DC motor product installation starting position and the unqualified motor position in the micro DC motor classification detection area. The specific angle range is 0° (micro DC motor installation starting position) to 140° (unqualified motor position in the micro DC motor classification detection area). The upper computer software analyzes the collected micro DC motor signal and derives the micro DC motor quality result based on the signal characteristics. If the result is a good motor, the product is qualified; if it is an unqualified motor, the product is unqualified.

[0048] After the motor product passes the inspection of the micro DC motor detection device 1, the motor product will be placed on both sides of the motor classification baffle 3 according to the inspection results, and then the conveyor motor 5 drives the conveyor belt 2 to transport the inspected motor product out of the entire micro DC motor quality inspection and judgment test machine.

[0049] As an embodiment, this embodiment sets six micro DC motor detection devices 1 in parallel and fixed on the device base 4, such as Figure 2 、 Figure 3shown.

[0050] like Figure 5 and Figure 6 As shown, each micro DC motor detection device 1 includes a stepper motor 1-1, sound insulation cotton 1-2, a motor clamping air gripper, a current measuring copper sheet 1-5, a condenser microphone 1-6, a proximity switch limiter 1-7, a proximity switch 1-8, a synchronous pulley 1-9, a synchronous belt 1-10, a synchronous belt connecting air gripper device 1-11, and a limiter device 1-12. The synchronous belt connecting air gripper device 1-11 includes a connecting shaft. The motor clamping air gripper includes an upper motor clamping air gripper 1-3 and a lower motor clamping air gripper 1-4.

[0051] The stepper motor 1-1 is fixed in the motor fixing frame, and the sound insulation cotton 1-2 is provided on the fixing plates on both sides of the motor fixing frame. The current measuring copper sheet 1-5 is fixed to one side of the motor fixing frame, located in front of the stepper motor 1-1, and can collect the current signal of the micro DC motor when it is running. The upper air gripper 1-3 and the lower air gripper 1-4 of the clamping motor are fixed to one side of the motor fixing frame, located in front of the upper and lower sides of the current measuring copper sheet 1-5. There are two current measuring copper sheets 1-5, which are respectively connected to the positive and negative poles of the voltage-stabilized power supply, and there is a distance between the two copper sheets. The condenser microphone 1-6 is fixed to one side of the motor fixing frame, located between the upper air gripper 1-3 and the lower air gripper 1-4 of the clamping motor, and collects the sound signal of the micro DC motor when it is running. The motor product to be tested is placed in the arc groove in the lower air gripper 1-4 of the clamping motor.

[0052] The proximity switch 1-8 is fixed to one side of the motor mounting bracket, in front of the upper air gripper 1-3 of the clamping motor. The proximity switch limiter 1-7 is fixed to one side of the proximity switch 1-8, near the upper air gripper 1-3 of the clamping motor. The proximity switch limiter 1-7 and proximity switch 1-8 are aligned and positioned parallel to the horizontal line, so that the openings of the upper air gripper 1-3 and the lower air gripper 1-4 of the clamping motor are parallel to the horizontal line, facilitating the installation of the micro DC motor before testing. When the clamping motor air gripper returns to its original position, the proximity switch is triggered, causing the clamping motor air gripper to stop in the ready position, preventing the clamping motor air gripper from rotating too far and causing damage to the device.

[0053] like Figure 7 and Figure 8 As shown, the synchronous belt connecting air gripper device 1-11 is fixed on the outside of the motor fixing frame, and the limiting device 1-12 is fixed on the outside of the motor fixing frame and can be located at any position on the synchronous belt 1-10, thereby preventing the movement of the synchronous belt 1-10 and achieving the limiting effect. As an embodiment, the limiting device 1-12 is a blocking plate.

[0054] The stepper motor 1-1 is connected to the synchronous pulley 1-9; the synchronous pulley 1-9 is connected to the synchronous belt 1-10 and moves together; at the same time, the synchronous belt 1-10 is connected to the synchronous belt connecting air gripper device 1-11; the synchronous belt 1-10 is connected to the connecting shaft in the air gripper device 1-11, and the connecting shaft is also connected to the mounting plates of the upper air gripper 1-3 of the clamping motor and the lower air gripper 1-4 of the clamping motor; at the same time, the mounting plate is connected to the proximity switch limit plate 1-7.

[0055] The stepper motor 1-1 drives the synchronous pulley 1-9 to rotate, and the synchronous pulley 1-9 drives the synchronous belt 1-10 to move at the same time; at the same time, the movement of the synchronous belt 1-10 drives the connecting shaft in the synchronous belt connected air gripper device 1-11 to rotate, and the mounting plates of the clamping motor upper air gripper 1-3 and the clamping motor lower air gripper 1-4 connected to the connecting shaft in the synchronous belt connected air gripper device 1-11 drive the clamping motor air gripper to rotate at the same time; at the same time, the proximity switch limit plate 1-7 connected to the mounting plate connected to the clamping motor upper air gripper 1-3 and the clamping motor lower air gripper 1-4 also makes the same movement.

[0056] Since the proximity switch limit plate 1-7 is limited by the proximity switch 1-8 and the synchronous belt 1-10 is limited by the limit device 1-12, the entire rotating mechanism or the output shaft of the stepping motor 1-1 can only rotate within a certain range.

[0057] The upper air gripper 1-3 of the clamping motor and the lower air gripper 1-4 of the clamping motor are set as follows: the upper air gripper 1-3 of the clamping motor moves up and down; the lower air gripper 1-4 of the clamping motor does not move.

[0058] Regarding the clamping action of the clamping motor's air grippers, the micro DC motor is placed in the arc groove in the clamping motor's lower air grippers 1-4 during installation before inspection. At this point, the micro DC motor terminals are in contact with the current measuring copper sheet 1-5. If the clamping motor's lower air grippers 1-4 were to move at this time, friction would occur between the micro DC motor terminals and the current measuring copper sheet 1-5, potentially damaging the micro DC motor terminals. Therefore, to prevent damage to the micro DC motor terminals, the clamping motor's upper air grippers 1-3 are used to move up and down, while the clamping motor's lower air grippers 1-4 are stationary.

[0059] The material used for the current measuring copper sheet 1-5 is brass, which has excellent conductivity. When testing the micro DC motor, the voltage-stabilized power supply connected to the current measuring copper sheet 1-5 provides a stable voltage, giving a DC voltage to the terminals of the micro DC motor, so that the micro DC motor can work. At this time, the current signal of the micro DC motor is output to the acquisition card through the current measuring copper sheet 1-5 and then enters the host computer for analysis and judgment.

[0060] As for the condenser microphone 1-6, when the micro DC motor is operating, it collects the sound signal of the operating operation, and sends the digital level information of the sound signal to the host computer through the USB interface for analysis and judgment.

[0061] The stepper motor 1-1 is connected to the PLC managed by the host computer. When the host computer obtains the quality inspection result of the micro DC motor at this position, the host computer gives the PLC corresponding instructions, and the PLC then gives the stepper motor 1-1 the corresponding rotation degree, so that the stepper motor 1-1 drives the entire rotating mechanism to move.

[0062] The application of the test machine for micro DC motor quality detection and judgment includes the following steps:

[0063] Step S1: Place the micro DC motor in the arc groove of the lower air gripper 1-4 of the clamping motor, so that the micro DC motor terminals are in contact with the current measuring copper sheet 1-5. Then, move the upper air gripper 1-3 of the clamping motor downward so that the micro DC motor is clamped by the air gripper of the clamping motor, and then prepare to measure the signal of the micro DC motor.

[0064] Step S2: The voltage-stabilized power supply supplies a DC voltage to the current measuring copper sheet 1-5, and a DC current is supplied to the terminals of the micro DC motor in contact with the current measuring copper sheet 1-5, causing the micro DC motor to operate at no load. At this time, the condenser microphone 1-6 collects the sound signal of the micro DC motor when it is running and imports it into the host computer through the USB interface; at the same time, the current measuring copper sheet 1-5 collects the current signal of the micro DC motor when it is running and imports it into the host computer through the PCI acquisition board;

[0065] Step S3: The host computer software analyzes the collected sound signal and current signal of the micro DC motor, extracts the characteristics of the sound signal and current signal, and obtains the quality result of the micro DC motor based on the characteristics of the signal. Based on the quality result, the host computer software gives the PLC controller corresponding instructions, and the PLC controller gives the stepper motor 1-1 in the micro DC motor detection device 1 a corresponding rotation angle according to the instructions. The stepper motor 1-1 drives the synchronous pulley 1-9 to rotate, and the synchronous pulley 1-9 simultaneously drives the synchronous belt 1-10 to move; at the same time, the movement of the synchronous belt 1-10 drives the connecting shaft in the synchronous belt connecting air gripper device 1-11 to rotate, and the mounting plates of the clamping motor upper air gripper 1-3 and the clamping motor lower air gripper 1-4 connected to the connecting shaft in the synchronous belt connecting air gripper device 1-11 also drive the clamping motor air gripper to rotate, and the micro DC motor clamped by the clamping motor air gripper is located directly above the corresponding classification area along with the entire rotating device.

[0066] In step S4, when the air gripper for the motor to be clamped rotates to the corresponding angle, the micro-DC motor is located directly above the conveyor belt 2, and the conveyor belt 2 is divided into two areas by the motor classification baffle 3. At this time, the micro-DC motor is located directly above the area corresponding to the upper computer's judgment result in step S3. When the air gripper for the motor to be clamped rotates to the corresponding angle, the motor clamping upper air gripper 1-3 moves upward, causing the air gripper for clamping the motor to open and release the clamped micro-DC motor, allowing the motor to fall onto the conveyor belt 2 of the micro-DC motor conveyor 1. The air gripper for clamping the motor can rotate at two angles, and will stop at the two ends of the motor classification baffle 3 in the micro-DC motor conveyor 1 to achieve the purpose of motor classification.

[0067] As an embodiment, the rotation angle of the clamping motor air gripper is determined by the result of the analysis of the host computer software in step S3. The host computer software gives the PLC controller an instruction to rotate the stepper motor, thereby driving the clamping motor air gripper to rotate. For example, if it is determined to be a good motor, the rotation angle is about 45 degrees. At this time, the opening of the clamping motor air gripper is facing the right side of the motor classification baffle 3 (with Figure 4 If it is judged as an unqualified motor, the rotation angle is about 135 degrees, and the opening of the motor clamping claw is facing the left side of the motor classification baffle 3. Figure 9 As shown, Figure 9 (a) is the case of a good motor. Figure 9 (b) is a schematic diagram of an unqualified motor.

[0068] In step S5, the micro DC motor conveying device starts the conveying device motor 5, thereby driving the conveyor belt 2 to transport the placed and classified micro DC motors. At the same time, the stepper motor 1-1 in the micro DC motor detection device returns the clamping motor air gripper to its original position according to the opposite action in step S3. Here, when the proximity switch limit plate 1-7 is aligned with the proximity switch 1-8, the stepper motor 1-1 is given a corresponding instruction, so that the clamping motor air gripper will not exceed the original position, thereby avoiding damage to the device and danger.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A testing machine for micro DC motor quality detection and judgment, characterized in that: The invention comprises at least one micro DC motor detection device, a device base and a micro DC motor transmission device; the micro DC motor detection device is fixed on the device base; the micro DC motor transmission device is located below the micro DC motor detection device; when the motor product to be tested passes the inspection of the micro DC motor detection device, it is placed in the micro DC motor transmission device.

2. A testing machine for micro DC motor quality detection and judgment according to claim 1, characterized in that: The micro DC motor detection device includes a stepper motor, sound insulation cotton, a motor clamping claw, a current measuring copper sheet, a proximity switch limit plate, a proximity switch, a synchronous pulley, a synchronous belt, a synchronous belt connecting the claw device and a limit device; The synchronous belt connecting air claw device includes a connecting shaft; the clamping motor air claw includes an upper clamping motor air claw and a lower clamping motor air claw; The stepper motor is fixed in the motor fixing frame, and the sound insulation cotton is provided on the fixing plates on both sides of the motor fixing frame; the current measuring copper sheet is fixed on one side of the motor fixing frame, and is located in front of the stepper motor; the upper air gripper for clamping the motor and the lower air gripper for clamping the motor are fixed on one side of the motor fixing frame, and are located in front of the upper and lower sides of the current measuring copper sheet; the motor product to be tested is placed in the lower air gripper for clamping the motor; The proximity switch is fixed on one side of the motor fixing frame and is located in front of the air gripper on the clamping motor; The proximity switch limit plate is fixed to one side of the proximity switch, close to the upper air gripper of the clamping motor; the proximity switch limit plate and the proximity switch are aligned and arranged at a position where the openings of the upper air gripper of the clamping motor and the lower air gripper of the clamping motor are parallel to the horizontal line, which facilitates the installation work before the micro DC motor is tested; The synchronous belt connecting air claw device is fixed on the outside of the motor fixing frame, and the limit device is fixed on the outside of the motor fixing frame and is located on the outside of the synchronous belt, thereby preventing the movement of the connected synchronous belt and achieving the limiting effect; The stepper motor is connected to a synchronous pulley; the synchronous pulley is connected to a synchronous belt and moves together; at the same time, the synchronous belt is connected to a synchronous belt-connected air gripper device; the synchronous belt is connected to a connecting shaft in the air gripper device, and the connecting shaft is connected to the mounting plates of the upper air gripper of the clamping motor and the lower air gripper of the clamping motor; at the same time, the mounting plate is connected to a proximity switch limit plate; The stepper motor drives the synchronous pulley to rotate, and the synchronous pulley drives the synchronous belt to move at the same time. At the same time, the movement of the synchronous belt drives the connecting shaft of the synchronous belt-connected air gripper device to rotate. The mounting plates of the upper air gripper of the clamping motor and the lower air gripper of the clamping motor connected to the connecting shaft of the synchronous belt-connected air gripper device also drive the clamping motor air gripper to rotate. At the same time, the proximity switch limit plate connected to the mounting plates of the upper air gripper of the clamping motor and the lower air gripper of the clamping motor also makes the same movement. Since the proximity switch limit plate is limited by the proximity switch and the synchronous belt is limited by the limit device, the entire rotating mechanism or the stepper motor output shaft can only rotate within a certain range.

3. A testing machine for micro DC motor quality detection and judgment according to claim 2, characterized in that: The micro DC motor detection device is provided with a condenser microphone, which is fixed on one side of the motor fixing frame and located between the upper air claw of the clamping motor and the lower air claw of the clamping motor to collect sound signals when the micro DC motor is running.

4. A testing machine for micro DC motor quality detection and judgment according to claim 2, characterized in that: There are two copper sheets for measuring electricity, which are respectively connected to the positive and negative poles of the voltage-stabilized power supply, and a distance is set between the two copper sheets.

5. A testing machine for micro DC motor quality detection and judgment according to claim 2, characterized in that: An arc groove is provided in the lower air claw of the clamping motor, and the motor product to be tested is placed in the arc groove in the lower air claw of the clamping motor.

6. A testing machine for micro DC motor quality detection and judgment according to claim 2, characterized in that: The limiting device is a blocking limiting piece.

7. A testing machine for micro DC motor quality detection and judgment according to any one of claims 1 to 6, characterized in that: The micro DC motor transmission device includes a conveyor belt, a conveyor motor and a conveyor; the conveyor device includes a conveyor frame, the conveyor belt is located on the conveyor frame, and the conveyor motor is used to drive the conveyor belt to perform transmission movement.

8. A testing machine for micro DC motor quality detection and judgment according to claim 7, characterized in that: The conveyor frame is provided with a motor classification baffle, which divides the conveyor belt into two areas, representing a good motor area and a bad motor area respectively.

9. A testing machine for micro DC motor quality detection and judgment according to claim 8, characterized in that: There is a distance between the motor classification baffle and the rotation travel path of the clamping motor air gripper.

10. A detection and judgment method using a testing machine for detecting and judging the quality of a micro DC motor according to claim 9, characterized in that: The following steps are involved: Step S1: After the micro DC motor is placed in the clamping motor air gripper, the clamping motor air gripper clamps the motor. At this time, the end terminal of the micro DC motor is in contact with the measuring copper sheet, and the motor signal is ready to be measured; Step S2: The voltage-stabilized power supply supplies power to the current measuring copper sheet, causing the micro DC motor to operate. The condenser microphone collects the sound signal of the motor while the current measuring copper sheet collects the current signal of the motor. Both signals are simultaneously uploaded to the host computer. Step S3: The host computer software analyzes the collected motor sound signal and current signal, and gives a judgment result to the stepper motor in the micro DC motor detection device according to the signal situation. According to the result, the stepper motor drives the synchronous belt, thereby driving the clamping motor air gripper to rotate a corresponding angle; Step S4: When the air gripper of the motor to be clamped rotates to a corresponding angle, the air gripper of the motor to be clamped opens and lowers the clamped micro DC motor, so that the motor falls into the micro DC motor conveying device; The motor clamping claw has two rotation angles, which will stop at the two ends of the motor classification baffle in the micro DC motor conveying device to achieve the purpose of motor classification; Step S5: the micro DC motor conveying device starts the conveyor belt to transport the placed and classified micro DC motors out, and at the same time, the motor clamping claws in the micro DC motor detection device return to their original positions.

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