An airtightness test equipment for electric motor assembly production

Abstract

The present invention discloses an air tightness test equipment for electric motor assembly production, the present invention relates to the technical field of electric motor detection equipment, the test equipment comprises a box body, a control panel, an air pump, a comparison mechanism, an air purification mechanism and a feeding mechanism, the box body is provided with a through hole and a sliding hole, the air pump is connected to the through hole through a pipeline, the comparison mechanism comprises a base, the air purification mechanism comprises an electric control slide and a three-pronged pipe, the control panel, the air pump, the base, the electric control slide and the feeding mechanism are all fixedly connected to the box body, the three-pronged pipe is slidably connected to the comparison mechanism and the sliding hole, the air pump is connected to the air purification mechanism through a hose, the comparison mechanism, the air purification mechanism and the feeding mechanism are all connected to the control panel through an electrical signal; the present invention automatically completes the air tightness test inspection of the entire motor after assembly, detects the air tightness by comparison using a differential pressure method, actively adjusts the internal capacity of the comparison reference cavity according to different models of motors, adjusts the leakage value of the reference cavity, and improves the detection accuracy of the differential pressure method.

Description

Technical Field

[0001] The invention relates to the technical field of motor detection equipment, in particular to airtightness testing equipment used in motor assembly production. Background Art

[0002] Electric motors are widely used in harsh environments such as new energy vehicles, household appliances, and industrial equipment. Their waterproof and dustproof properties have a decisive impact on product reliability and service life. Therefore, before electric motors are put into practical use, their airtightness must be rigorously tested. Currently, the core testing method is the differential pressure method, which is mainly used to test the sealing performance of the motor after assembly.

[0003] Existing differential pressure air tightness detection technologies, such as CN102141460A, have two significant limitations: first, the reference chamber capacity is fixed, making it difficult for the detection system to adapt to the air tightness detection requirements of motors of different models, resulting in poor versatility; second, the gas filled into the reference chamber during the detection process is not filtered or dried, and the judgment relies solely on the differential pressure signal, which cannot effectively eliminate interference factors such as ambient temperature fluctuations and pressure source fluctuations, thereby causing significant fluctuations in the accuracy of the test results, affecting the stability and reliability of the test data. Summary of the Invention

[0004] The object of the present invention is to provide an airtightness test device for electric motor assembly production to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an air tightness testing device for electric motor assembly production includes a box body, a control panel, an air pump, a comparison mechanism, an air purification mechanism and a feeding mechanism. The box body is provided with a through hole and a sliding hole. The air pump is connected to the through hole through a pipe. The comparison mechanism includes a base. The air purification mechanism includes an electric control slide and a three-pronged pipe. The control panel, the air pump, the base, the electric control slide and the feeding mechanism are all fixedly connected to the box body. The three-pronged pipe is slidably connected to the comparison mechanism and the sliding hole. The air pump is connected to the air purification mechanism through a hose. The comparison mechanism, the air purification mechanism and the feeding mechanism are all connected to the control panel through electrical signals.

[0006] The present invention is an air tightness test and detection equipment for an electric motor after assembly. The box of the present invention is coated with red primer, the control panel sends a control signal, the loading mechanism transports the assembled electric motor to the detection station, the vacuum pump draws air into the air purification mechanism, filters and dries the air, and the three-pronged pipe synchronously supplies the same capacity of clean gas to the comparison mechanism and the motor at a stable pressure. The comparison mechanism and the motor maintain the same pressure for a period of time to ensure that the leakage does not exceed the specified flow rate.

[0007] Furthermore, the comparison mechanism also includes an outer cylinder, a pressure regulating mechanism, a sealing mechanism, a one-way air valve and an air pressure sensor. The outer cylinder is provided with an internal thread section, a slide rail, an air inlet and an air outlet. The pressure regulating mechanism includes a slide plate and an I-shaped disk. The slide plate is slidably connected to the slide rail. The I-shaped disk is provided with an external thread. The internal thread section is connected to the external thread through a thread. The sealing mechanism is fixedly connected to the I-shaped disk. There are two groups of one-way air valves, one group of one-way air valves is fixedly connected to the air inlet, and the other group of one-way air valves is fixedly connected to the air outlet. The three-pronged pipe is slidably connected to the one-way air valve at one end near the air inlet, and the air pressure sensor is fixedly connected to the outer cylinder.

[0008] When the present invention detects the air tightness of the motor, the comparison mechanism actively adjusts the reference capacity of the comparison mechanism according to the different internal air tightness capacities of motors of different models to ensure that the comparison value is accurate, the pressure regulating mechanism adjusts the capacity of the space formed by the I-type disk close to the air pressure sensor side and the outer cylinder, the sealing mechanism relatively seals the I-type disk and the outer cylinder to ensure that the leakage of the I-type disk is close to the qualified leakage of the motor, the three-pronged pipe synchronously supplies clean gas of the same capacity into the outer cylinder and the motor at a stable pressure, the dry clean gas enters the outer cylinder at a stable pressure through the air outlet to maintain the pressure, part of the gas enters the outer cylinder close to the air outlet side through the gap between the I-type disk and the outer cylinder, and is discharged by the one-way air valve, the air pressure sensor records the gas leakage, and the air tightness of the reference motor is compared with the same reference gas leakage and the air pressure fed back from the motor.

[0009] Furthermore, the pressure regulating mechanism also includes a servo motor, which is fixedly connected to the slide, and the output end of the servo motor is fixedly connected to the I-type disk. The sealing mechanism includes a power supply, which is fixedly connected to the I-type disk. The servo motor, power supply, and air pressure sensor are all connected to the control panel through electrical signals.

[0010] The servo motor outputs fixed-axis torque to the I-type disk. Through the threaded connection between the internal thread section and the external thread, the I-type disk rotates around its axis. The slide fixed to the servo motor slides along the slide rail to adjust the capacity of the space formed by the I-type disk near the air pressure sensor and the outer cylinder.

[0011] Furthermore, the sealing mechanism also includes a strong magnetic ring and a magnetic oil sac. The strong magnetic ring is connected to the power supply through a line, and the strong magnetic ring is fixedly connected to the I-shaped disk and the magnetic oil sac.

[0012] The filling material inside the magnetic oil sac is hydraulic oil mixed with magnetic powder. The control panel sends a control signal to the power supply. The power supply energizes the strong magnetic ring to generate a magnetic field. The strong magnetic ring generates a repulsive force on the magnetic powder in the hydraulic oil, so that the magnetic powder in the hydraulic oil is away from the center of the strong magnetic ring, and the elastic stiffness of the magnetic oil sac away from the center of the strong magnetic ring is changed. The magnetic oil sac contacts the inside of the outer cylinder, and the gap between the magnetic oil sac and the outer cylinder is adjusted to ensure that the leakage of the I-type disk is close to the qualified leakage of the motor.

[0013] Furthermore, the one-way air valve includes a valve body, a spring, a ball core and an annular tube. The valve body is fixedly connected to the outer tube and the annular tube. The spring is fixedly connected to the valve body and the ball core. The ball core is slidingly connected to the valve body. The three-pronged tube is slidingly connected to the annular tube. The three-pronged tube is in contact with the ball core.

[0014] The electric control slide drives the three-pronged tube to move closer to the air outlet. The three-pronged tube contacts the ball core and compresses the spring. The valve body is no longer sealed by the ball core. The dry and clean gas enters the outer cylinder through the valve body and the air outlet to maintain pressure.

[0015] Furthermore, the air purification mechanism also includes a filtering mechanism, which includes a side plate, which is slidingly connected to the electric control slide, and the three-pronged tube is fixedly connected to the side plate. The three-pronged tube is provided with a side air hole, and the side air hole is provided on the three-pronged tube near the side of the ball core. The side air hole is in contact with the ring tube, and the electric control slide is connected to the control panel through an electrical signal.

[0016] The electrically controlled slide drives the three-pronged tube to move closer to the air outlet. The three-pronged tube contacts the ball core and compresses the spring. The valve body is no longer sealed by the ball core, and the side air holes are no longer blocked by the ring tube. Dry, clean, and stable pressure air flows through the side air holes, valve body, and air outlet into the outer tube, effectively eliminating the influence of ambient temperature fluctuations and pressure source fluctuations, and achieving higher test accuracy.

[0017] Furthermore, the filtering mechanism also includes an air filter and a pressure reducing valve. The air filter is fixedly connected to the side plate and the pressure reducing valve. The air filter is connected to the air pump through a hose, and the three-pronged pipe is connected to the pressure reducing valve.

[0018] The vacuum pump draws air into the air filter, filters and dries the air, and then passes it into the pressure reducing valve to stabilize the gas pressure. The three-pronged pipe synchronously supplies the same volume of clean gas to the comparison mechanism and the motor at a stable pressure.

[0019] Furthermore, the loading mechanism includes a loading conveyor belt, a transport clamp and a clamping platform. The loading conveyor belt, the transport clamp and the clamping platform are all fixedly connected to the box body. The loading conveyor belt, the transport clamp and the clamping platform are all connected to the control panel through electrical signals.

[0020] The loading conveyor transports the assembled motor, the handling claw carries the motor to the inspection station, and the clamping platform fixes the motor.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention designs a pressure regulating mechanism. Since the internal airtight capacity of motors of different models is different, in order to ensure the accuracy of the comparison value, the servo motor outputs a fixed-axis torque to the I-type disk. Through the threaded connection between the internal thread section and the external thread, the I-type disk rotates around its axis, and the slide fixedly assembled by the servo motor slides along the slide rail to adjust the capacity of the space formed by the I-type disk close to the air pressure sensor side and the outer cylinder; the present invention designs a sealing mechanism to ensure that the leakage of the I-type disk is close to the leakage when the motor is a qualified product. The filling material in the magnetic oil capsule is hydraulic oil mixed with magnetic powder. The control panel sends a control signal to the power supply. The power supply is a strong magnetic ring that generates a magnetic field. The strong magnetic ring generates a repulsive force on the magnetic powder in the hydraulic oil, so that the magnetic powder in the hydraulic oil is away from the center of the strong magnetic ring, and the elastic stiffness of the magnetic oil capsule away from the center of the strong magnetic ring is changed. The magnetic oil capsule contacts the inside of the outer cylinder to adjust the gap between the magnetic oil capsule and the outer cylinder; the present invention designs a comparison mechanism. When the present invention detects the airtightness of the motor, according to Different types of motors have different internal airtight capacities. The comparison mechanism actively adjusts the reference capacity of the comparison mechanism to ensure that the comparison value is accurate. The pressure regulating mechanism adjusts the capacity of the space formed by the I-type disk near the air pressure sensor and the outer cylinder. The sealing mechanism relatively seals the I-type disk and the outer cylinder to ensure that the leakage of the I-type disk is close to the qualified leakage of the motor. The three-pronged pipe synchronously supplies clean gas of the same capacity to the outer cylinder and the motor at a stable pressure. The dry clean gas enters the outer cylinder through the air outlet to maintain pressure. Part of the gas enters the outer cylinder near the air outlet through the gap between the I-type disk and the outer cylinder and is discharged by the one-way air valve. The air pressure sensor records the gas leakage and compares the airtightness of the reference motor with the same reference gas leakage and the air pressure fed back from the inside of the motor. The present invention automatically completes the airtightness test and detection of the motor after assembly, and detects the airtightness by differential pressure method. It actively adjusts the internal airtightness capacity of the reference cavity according to the different types of motors, adjusts the leakage value of the reference cavity, and improves the accuracy of the differential pressure detection value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is an isometric diagram of the overall structure of the present invention;

[0024] Figure 3 It is a partial cross-sectional view of the overall structure of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the comparison mechanism of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the sealing mechanism of the present invention;

[0027] Figure 6 for Figure 4 A magnified schematic diagram of a local area A;

[0028] Figure 7 This is a schematic structural diagram of the air purification mechanism of the present invention;

[0029] Figure 8 It is a schematic structural diagram of the feeding mechanism of the present invention.

[0030] Figure: 1. Box; 11. Through hole; 12. Slide hole; 2. Control panel; 3. Vacuum pump; 4. Comparison mechanism; 41. Base; 42. Outer cylinder; 421. Internally threaded section; 422. Slide rail; 423. Air inlet; 424. Air outlet; 43. Pressure regulating mechanism; 431. Slide plate; 432. Servo motor; 433. I-type plate; 4331. External thread; 44. Sealing mechanism; 441. Power supply; 442. Strong magnetic ring ;443, magnetic oil bag; 45, one-way air valve; 451, valve body; 452, spring; 453, ball core; 454, ring cylinder; 46, air pressure sensor; 5, air purification mechanism; 51, electric control slide; 52, three-pronged pipe; 521, side air hole; 53, filtering mechanism; 54, side plate; 55, air filter; 56, pressure reducing valve; 6, feeding mechanism; 61, feeding conveyor belt; 62, carrying clamp; 63, clamping platform. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] like Figure 1 、 Figure 2 、 Figure 3 As shown, the present invention provides a technical solution of airtightness test equipment for electric motor assembly production, including a box body 1, a control panel 2, an air pump 3, a comparison mechanism 4, an air purification mechanism 5 and a feeding mechanism 6. The box body 1 is provided with a through hole 11 and a sliding hole 12. The air pump 3 is connected to the through hole 11 through a pipeline. The comparison mechanism 4 includes a base 41. The air purification mechanism 5 includes an electric control slide 51 and a three-pronged pipe 52. The control panel 2, the air pump 3, the base 41, the electric control slide 51 and the feeding mechanism 6 are all fixedly connected to the box body 1. The three-pronged pipe 52 is slidably connected to the comparison mechanism 4 and the sliding hole 12. The air pump 3 is connected to the air purification mechanism 5 through a hose. The comparison mechanism 4, the air purification mechanism 5 and the feeding mechanism 6 are all connected to the control panel 2 through electrical signals.

[0033] The present invention is an air tightness test and detection equipment for an electric motor after assembly. The box 1 of the present invention is coated with red primer, the control panel 2 sends a control signal, the loading mechanism 6 transports the assembled electric motor to the detection station, the vacuum pump 3 draws air into the air purification mechanism 5, filters and dries the air, and the three-pronged pipe 52 synchronously supplies the same capacity of clean gas to the comparison mechanism 4 and the motor at a stable pressure. The comparison mechanism 4 and the motor maintain the same pressure for a period of time to ensure that the leakage does not exceed the specified flow rate.

[0034] like Figure 4 As shown, the comparison mechanism 4 also includes an outer cylinder 42, a pressure regulating mechanism 43, a sealing mechanism 44, a one-way air valve 45 and an air pressure sensor 46. The outer cylinder 42 is provided with an internal thread section 421, a slide rail 422, an air inlet 423 and an air outlet 424. The pressure regulating mechanism 43 includes a slide plate 431 and an I-shaped disk 433. The slide plate 431 is slidably connected to the slide rail 422. The I-shaped disk 433 is provided with an external thread 4331. The internal thread section 421 is threadedly connected to the external thread 4331. The sealing mechanism 44 is fixedly connected to the I-shaped disk 433. There are two groups of one-way air valves 45, one group of one-way air valves 45 is fixedly connected to the air inlet 423, and the other group of one-way air valves 45 is fixedly connected to the air outlet 424. The three-pronged pipe 52 is slidably connected to the one-way air valve 45 at one end near the air inlet 423. The air pressure sensor 46 is fixedly connected to the outer cylinder 42.

[0035] When the present invention detects the air tightness of the motor, the comparison mechanism 4 actively adjusts the reference capacity of the comparison mechanism 4 according to the different internal airtight capacities of motors of different models to ensure that the comparison value is accurate. The pressure regulating mechanism 43 adjusts the capacity of the space formed by the I-type disk 433 and the outer cylinder 42 near the air pressure sensor 46. The sealing mechanism 44 relatively seals the I-type disk 433 and the outer cylinder 42 to ensure that the leakage of the I-type disk 433 is close to the qualified leakage of the motor. The three-pronged pipe 52 synchronously supplies the clean gas of the same capacity into the outer cylinder 42 and the motor at a stable pressure. The dry and clean gas enters the outer cylinder 42 at a stable pressure through the air outlet 424 to maintain the pressure. Part of the gas enters the outer cylinder 42 near the air outlet 424 side through the gap between the I-type disk 433 and the outer cylinder 42 and is discharged by the one-way air valve 45. The air pressure sensor 46 records the gas leakage. The air tightness of the reference motor is compared with the same reference gas leakage and the air pressure fed back from the motor.

[0036] like Figure 4 、 Figure 5 As shown, the pressure regulating mechanism 43 also includes a servo motor 432, which is fixedly connected to the slide 431, and the output end of the servo motor 432 is fixedly connected to the I-type disk 433. The sealing mechanism 44 includes a power supply 441, which is fixedly connected to the I-type disk 433. The servo motor 432, the power supply 441, and the air pressure sensor 46 are all connected to the control panel 2 through electrical signals.

[0037] The servo motor 432 outputs a fixed-axis torque to the I-type disk 433. Through the threaded connection between the internal thread section 421 and the external thread 4331, the I-type disk 433 rotates around its axis. The slide 431 fixedly assembled with the servo motor 432 slides along the slide rail 422 to adjust the capacity of the space formed by the I-type disk 433 and the outer cylinder 42 near the air pressure sensor 46.

[0038] like Figure 4 、 Figure 5 As shown, the sealing mechanism 44 further includes a strong magnetic ring 442 and a magnetic oil sac 443 . The strong magnetic ring 442 is connected to the power supply 441 via a line, and the strong magnetic ring 442 is fixedly connected to the I-shaped disk 433 and the magnetic oil sac 443 .

[0039] The filling material inside the magnetic oil capsule 443 is hydraulic oil mixed with magnetic powder. The control panel 2 sends a control signal to the power supply 441. The power supply 441 energizes the strong magnetic ring 442 to generate a magnetic field. The strong magnetic ring 442 generates a repulsive force on the magnetic powder in the hydraulic oil, so that the magnetic powder in the hydraulic oil is away from the center of the strong magnetic ring 442, and the elastic stiffness of the magnetic oil capsule 443 away from the center of the strong magnetic ring 442 is changed. The magnetic oil capsule 443 contacts the inside of the outer cylinder 42, and the gap between the magnetic oil capsule 443 and the outer cylinder 42 is adjusted to ensure that the leakage amount of the I-type disk 433 is close to the qualified leakage amount of the motor.

[0040] like Figure 6 As shown, the one-way air valve 45 includes a valve body 451, a spring 452, a ball core 453 and an annular tube 454. The valve body 451 is fixedly connected to the outer tube 42 and the annular tube 454. The spring 452 is fixedly connected to the valve body 451 and the ball core 453. The ball core 453 is slidably connected to the valve body 451. The three-pronged tube 52 is slidably connected to the annular tube 454, and the three-pronged tube 52 is in contact with the ball core 453.

[0041] The electrically controlled slide 51 drives the three-pronged tube 52 to move toward the air outlet 424. The three-pronged tube 52 contacts the ball core 453, compressing the spring 452. The valve body 451 is no longer sealed by the ball core 453. The dry and clean gas enters the outer tube 42 through the valve body 451 and the air outlet 424 to maintain the pressure, effectively eliminating the influence of the ambient temperature fluctuation and the pressure source fluctuation, and improving the test accuracy.

[0042] like Figure 7 As shown, the air purification mechanism 5 also includes a filtering mechanism 53, which includes a side plate 54. The side plate 54 is slidably connected to the electric control slide 51, and the three-pronged tube 52 is fixedly connected to the side plate 54. The three-pronged tube 52 is provided with a side air hole 521. The side air hole 521 is provided on the three-pronged tube 52 on the side close to the ball core 453. The side air hole 521 is in contact with the ring tube 454, and the electric control slide 51 is connected to the control panel 2 through an electrical signal.

[0043] The electrically controlled slide 51 drives the three-pronged tube 52 to move closer to the air outlet 424. The three-pronged tube 52 contacts the ball core 453, compresses the spring 452, and the valve body 451 is no longer sealed by the ball core 453. The side air hole 521 is no longer blocked by the ring tube 454. Dry, clean, and stable pressure air flows through the side air hole 521, the valve body 451, and the air outlet 424 into the outer tube 42.

[0044] like Figure 7 As shown, the filtering mechanism 53 also includes an air filter 55 and a pressure reducing valve 56. The air filter 55 is fixedly connected to the side plate 54 and the pressure reducing valve 56. The air filter 55 is connected to the air pump 3 through a hose, and the three-pronged pipe 52 is connected to the pressure reducing valve 56.

[0045] The vacuum pump 3 draws air into the air filter 55, filters and dries the air, and then passes it into the pressure reducing valve 56 to stabilize the gas pressure. The three-pronged pipe 52 synchronously supplies the same volume of clean gas to the comparison mechanism 4 and the motor at a stable pressure.

[0046] like Figure 8 As shown, the loading mechanism 6 includes a loading conveyor belt 61, a transport clamp 62 and a clamping platform 63. The loading conveyor belt 61, the transport clamp 62 and the clamping platform 63 are all fixedly connected to the box body 1. The loading conveyor belt 61, the transport clamp 62 and the clamping platform 63 are all connected to the control panel 2 through electrical signals.

[0047] The loading conveyor belt 61 transports the assembled motor, the transport clamp 62 transports the motor to the inspection station, and the clamping platform 63 fixes and clamps the motor.

[0048] The working principle of the present invention is as follows: the control panel 2 sends a control signal, the feeding mechanism 6 transports the assembled motor to the inspection station, the vacuum pump 3 draws air into the air filter 55, filters and dries the air, and then passes it into the pressure reducing valve 56 to stabilize the gas pressure. The three-pronged pipe 52 synchronizes the pressure-stabilizing electric control slide 51 with the same volume of clean gas and drives the three-pronged pipe 52 to move closer to the air outlet 424. The three-pronged pipe 52 contacts the ball core 453, compresses the spring 452, and the valve body 451 is no longer sealed by the ball core 453. The side air hole 5 21 is no longer blocked by the ring tube 454, and the dry, clean, and stable pressure air flows through the side air hole 521, the valve body 451, and the air outlet 424 into the outer tube 42 and the motor. According to the different airtight capacities of different types of motors, the servo motor 432 outputs a fixed axis torque to the I-type disk 433. Through the threaded connection between the internal thread section 421 and the external thread 4331, the I-type disk 433 rotates around its axis. The slide plate 431 fixedly assembled with the servo motor 432 slides along the slide rail 422, and the I-type disk 433 is adjusted to be close to the air pressure sensor 46. The capacity of the space formed by the side and the outer cylinder 42 ensures that the comparison value is accurate. The filling material in the magnetic oil capsule 443 is hydraulic oil mixed with magnetic powder. The control panel 2 sends a control signal to the power supply 441. The power supply 441 energizes the strong magnetic ring 442 to generate a magnetic field. The strong magnetic ring 442 generates a repulsive force on the magnetic powder in the hydraulic oil, so that the magnetic powder in the hydraulic oil is away from the center of the strong magnetic ring 442, and the elastic stiffness of the magnetic oil capsule 443 away from the center of the strong magnetic ring 442 is changed to ensure that the leakage of the I-type disk 433 is close to the qualified leakage of the motor, The leakage of the protective disc 433 is close to the qualified leakage of the motor. The three-pronged pipe 52 supplies the same volume of clean gas to the outer cylinder 42 and the motor synchronously and stably. The dry clean gas enters the outer cylinder 42 through the outlet hole 424 to maintain the pressure. Part of the gas enters the outer cylinder 42 near the outlet hole 424 through the gap between the protective disc 433 and the outer cylinder 42 and is discharged by the one-way air valve 45. The air pressure sensor 46 records the gas leakage. The air tightness of the reference motor is compared with the same reference gas leakage and the air pressure feedback from the motor.

[0049] 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, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An airtightness test device for electric motor assembly production, characterized by: The test equipment comprises a box (1), a control panel (2), an air pump (3), a comparison mechanism (4), an air purification mechanism (5) and a feeding mechanism (6); the box (1) is provided with a through hole (11) and a sliding hole (12); the air pump (3) is connected to the through hole (11) via a pipe; the comparison mechanism (4) comprises a base (41); the air purification mechanism (5) comprises an electric control slide (51) and a three-pronged tube (52); the control panel (2), the air pump (3), the base (41), the electric control slide (51) and the feeding mechanism (6) are all fixedly connected to the box (1); the three-pronged tube (52) is slidably connected to the comparison mechanism (4) and the sliding hole (12); the air pump (3) is connected to the air purification mechanism (5) via a hose; the comparison mechanism (4), the air purification mechanism (5) and the feeding mechanism (6) are all connected to the control panel (2) via an electrical signal; The comparison mechanism (4) further comprises an outer cylinder (42), a pressure regulating mechanism (43), a sealing mechanism (44), a one-way air valve (45) and an air pressure sensor (46); the outer cylinder (42) is provided with an internal thread section (421), a slide rail (422), an air inlet (423) and an air outlet (424); the pressure regulating mechanism (43) comprises a slide plate (431) and an I-shaped disc (433); the slide plate (431) is slidably connected to the slide rail (422); the I-shaped disc (433) is provided with an external thread (4331); The internal thread section (421) is connected to the external thread (4331) by a threaded connection. The sealing mechanism (44) is fixedly connected to the I-type disc (433). Two groups of one-way air valves (45) are provided. One group of one-way air valves (45) is fixedly connected to the air inlet (423), and the other group of one-way air valves (45) is fixedly connected to the air outlet (424). The three-pronged pipe (52) is slidably connected to the one-way air valve (45) at one end close to the air inlet (423). The air pressure sensor (46) is fixedly connected to the outer cylinder (42).

2. The airtightness test equipment for electric motor assembly production according to claim 1, characterized in that: The pressure regulating mechanism (43) further comprises a servo motor (432), the servo motor (432) being fixedly connected to the slide plate (431), and an output end of the servo motor (432) being fixedly connected to the I-shaped disk (433). The sealing mechanism (44) comprises a power supply (441), the power supply (441) being fixedly connected to the I-shaped disk (433). The servo motor (432), the power supply (441), and the air pressure sensor (46) are all connected to the control panel (2) via electrical signals.

3. The airtightness test equipment for electric motor assembly production according to claim 2, characterized in that: The sealing mechanism (44) further comprises a strong magnetic ring (442) and a magnetic oil sac (443). The strong magnetic ring (442) is connected to the power supply (441) via a line. The strong magnetic ring (442) is fixedly connected to the I-shaped disk (433) and the magnetic oil sac (443).

4. The airtightness test equipment for electric motor assembly production according to claim 1, characterized in that: The one-way air valve (45) comprises a valve body (451), a spring (452), a ball core (453) and an annular tube (454). The valve body (451) is fixedly connected to the outer tube (42) and the annular tube (454). The spring (452) is fixedly connected to the valve body (451) and the ball core (453). The ball core (453) is slidably connected to the valve body (451). The three-pronged tube (52) is slidably connected to the annular tube (454). The three-pronged tube (52) is in contact with the ball core (453).

5. The airtightness test equipment for electric motor assembly production according to claim 4, characterized in that: The air purification mechanism (5) further includes a filtering mechanism (53), the filtering mechanism (53) including a side plate (54), the side plate (54) being slidably connected to the electric control slide (51), the three-pronged tube (52) being fixedly connected to the side plate (54), the three-pronged tube (52) being provided with a side air hole (521), the side air hole (521) being provided on the three-pronged tube (52) on a side close to the ball core (453), the side air hole (521) being in contact with the ring tube (454), and the electric control slide (51) being connected to the control panel (2) via an electrical signal.

6. The airtightness test equipment for electric motor assembly production according to claim 5, characterized in that: The filtering mechanism (53) further comprises an air filter (55) and a pressure reducing valve (56). The air filter (55) is fixedly connected to the side plate (54) and the pressure reducing valve (56). The air filter (55) is connected to the air pump (3) via a hose, and the three-pronged pipe (52) is in communication with the pressure reducing valve (56).

7. The airtightness test equipment for electric motor assembly production according to claim 1, characterized in that: The feeding mechanism (6) comprises a feeding conveyor belt (61), a carrying clamp (62) and a clamping platform (63); the feeding conveyor belt (61), the carrying clamp (62) and the clamping platform (63) are all fixedly connected to the box body (1); and the feeding conveyor belt (61), the carrying clamp (62) and the clamping platform (63) are all connected to the control panel (2) via electrical signals.

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