Sensor airtightness detection system for new energy vehicle

Abstract

The invention relates to the technical field of sensor air tightness detection, and particularly discloses a sensor air tightness detection system for a new energy vehicle. A jig; the driving assembly comprises a pressing driving part, a sliding part and an air storage tank, the pressing driving part and the sliding part are both installed on the machine table, the pressing driving part is in transmission connection with the sliding part, the sliding part is provided with a first station, a second station and a third station, and a sliding base is arranged on the machine table and is in transmission connection with the sliding part. The sliding seat is arranged corresponding to one of the first station, the second station and the third station, helium is stored in the gas storage tank, and a gas pump is arranged on the gas storage tank; the re-checking assembly comprises a visual camera and a checking ring, the visual camera is mounted on the mounting frame, the checking ring can react with the helium and has color change along with the helium, and the visual camera can detect the color change on the checking ring. The method and the device have the effect of improving the detection accuracy and reliability.

Description

Technical Field

[0001] The present application relates to the technical field of sensor air tightness detection technology, and in particular to a sensor air tightness detection system for new energy vehicles. Background Art

[0002] With the rapid development of the new energy vehicle industry, on-board sensors, as core components for vehicle intelligence and safety control, are facing increasingly stringent performance and reliability requirements. Key components such as pressure sensors, temperature sensors, and gas concentration sensors are subject to long-term exposure to complex operating conditions (such as high and low temperatures, vibration, humidity, or corrosive environments). The airtightness of their sensor packaging structures directly affects signal acquisition accuracy and service life. This is particularly true in the battery management and thermal management systems of new energy vehicles. If sensor seal failure leads to moisture in the internal circuit or leakage of media, data drift or even system failure may occur. Therefore, sensors must undergo rigorous airtightness testing before leaving the factory to verify the reliability of their packaging process.

[0003] Currently, the industry generally uses customized sealing fixtures combined with airtightness testing equipment to complete testing. The specific process is as follows: the sensor to be tested is installed in the fixture's contoured cavity. A sealing ring or clamping mechanism is used to achieve physical contact between the cavity and the sensor's outer surface. The cavity is then filled with a test gas (such as helium or compressed air). The sensor is then leaked using the pressure drop method, flow method, or tracer gas method. The pressure drop method determines the amount of leakage by monitoring pressure changes within a sealed cavity; the gas flow method relies on a gas flow sensor to quantify the leak rate; and the helium mass spectrometry leak detection method uses helium as a tracer gas, detecting the helium concentration at the leak point with a mass spectrometer, offering high sensitivity. In addition, some equipment uses indirect testing methods such as full immersion in water or pressurization of a partially sealed cavity.

[0004] However, the sealing reliability of the fixture itself directly restricts the accuracy of the sensor detection results. Once the sealing mechanism on the fixture is easily worn or aged due to frequent assembly and disassembly, micro-leakage may occur between the test cavity and the sensor. However, it is difficult for operators to detect it in time, and they may mistakenly attribute the abnormal detection signal caused by fixture failure to sensor defects. Especially in large-scale, multi-model sensor mixed line detection scenarios, the false detection rate and rework costs remain high. Summary of the Invention

[0005] The present application provides an air tightness detection system for sensors for new energy vehicles. The monitoring system can perform air tightness detection on the sensors. By setting up pressure detection and visual detection, a dual judgment mechanism for the detection process is realized. That is, the pressure changes in the closed cavity inside the fixture are monitored by a built-in pressure sensor, and the air tightness of the detection fixture itself composed of a visual camera and a test ring is monitored. This can effectively reduce the false detection rate and missed detection rate, and improve the accuracy and reliability of air tightness detection of sensors for new energy vehicles.

[0006] In the first aspect, the present application provides a new energy vehicle sensor air tightness detection system that adopts the following technical solutions: A new energy vehicle sensor air tightness detection system, comprising: A machine platform, wherein a controller is provided on the machine platform; A fixture comprising a fixed mold and a movable mold, wherein the fixed mold is provided with a first receiving groove, a sealing ring is embedded on a surface of the fixed mold having the first receiving groove, and the movable mold is provided with a second receiving groove, wherein the first receiving groove and the second receiving groove can be combined to form a pressurized chamber for performing airtightness testing on a sensor, a pressure sensor is provided in the first receiving groove, and the pressure sensor is electrically connected to the controller; The driving assembly includes a pressing driving member, a sliding member and an air storage tank. A mounting seat is provided on the machine platform. The pressing driving member is fixed on the mounting seat. The sliding member is provided on the machine platform. The pressing driving member is transmission-connected to the sliding member. The sliding member is respectively provided with a first station, a second station and a third station. The first station is provided at one end of the sliding member, the third station is provided at the other end of the sliding member, and the second station is provided between the first station and the third station. A sliding seat is slidingly provided on the machine platform. The sliding seat is connected to the output end of the sliding member. The movable mold is fixedly mounted on the slide, and the movable mold is fixedly mounted on the output end of the pressing drive member. The gas storage tank is arranged on the machine platform, and helium is stored in the gas storage tank. An air pump is provided on the gas storage tank, and the air pump is electrically connected to the controller. The output end of the air pump is communicated with the pressurized chamber. When the pressing drive member drives the movable mold to approach the fixed mold, the slide is driven by the sliding member to approach the first station. A review component includes a visual camera and an inspection ring. An extension plate is fixed to one side of the mounting seat. The visual camera is arranged on the extension plate, and the visual camera is facing the second workstation. The visual camera is electrically connected to the controller. The inspection ring is arranged on the outer peripheral side of the sealing ring. The inspection ring is made of zeolite imidazolate framework material. The inspection ring can produce color changes under the action of helium, and the visual camera can detect the color change on the inspection ring.

[0007] By adopting the above technical solution, the coordinated structure of the fixed and movable molds in the fixture forms a pressurized chamber for airtightness testing. This, combined with the sealing ring and pressure sensor, forms a highly reliable airtight sealing and testing unit, ensuring a stable airtight testing environment and accurate testing. The clamping drive element controls the precise closing of the movable and fixed molds. Combined with the provision of a sliding element, automated translation between testing, review, and maintenance stations is achieved, significantly improving the overall automation level and testing efficiency. During the testing process, a built-in pressure sensor monitors pressure changes around the sensor in real time. A dual detection mechanism, consisting of a visual camera and a test ring, is employed. The test ring, made of a zeolite imidazolate framework material that reacts with trace amounts of helium with an accompanying color change, offers extremely high sensitivity and intuitive visual feedback. Combined with a high-resolution visual camera, this ring forms an intelligent image recognition and judgment system, ensuring that even minor leaks are detected promptly and enhancing the system's micro-leak detection capabilities. This collaborative judgment of air pressure monitoring and helium leak colorimetric feedback effectively reduces false detection and missed detection rates, improving the safety and reliability of testing.

[0008] Optionally, a replacement component is also included, which includes a transverse truss, a lifting arm, a replacement part and a first clamp. The transverse truss is arranged on the side of the third workstation away from the second workstation. A movable seat is slidingly arranged on the transverse truss. The lifting arm is lifted and lowered on the movable seat. A deflection part is provided at one end of the lifting arm close to the machine. A deflection plate is provided on the output end of the deflection part. The replacement part is arranged at one end of the deflection plate. The first clamp is arranged at the other end of the deflection plate. The second clamp is used to remove the sealing ring on the fixed mold. The replacement part is used to install a spare sealing ring for the fixed mold.

[0009] By adopting the above technical solution, the replacement component realizes the automatic replacement operation of the sealing ring through the coordinated cooperation of the transverse truss, lifting arm, deflection structure and clamping mechanism. By setting the sealing ring replacement process at the third workstation, the system can quickly complete the removal and replacement of the sealing ring after the visual camera detects the abnormality of the inspection ring, avoiding false detection or missed detection due to aging, damage or improper installation of the sealing ring. Compared with the traditional manual disassembly and assembly method, this structure can automatically identify the replacement position and accurately pick up and place the sealing ring, which significantly improves the replacement efficiency and operation accuracy, and greatly enhances the automation level, operation continuity and maintenance convenience of the detection system.

[0010] Optionally, the replacement part includes a positioning cylinder, a feeding sleeve, a pressing tube, a pressing plate and a pressing drive part, the positioning cylinder is fixedly arranged at one end of the deflection plate away from the first clamping jaw, one end of the positioning cylinder is open, the feeding sleeve is coaxially arranged in the positioning cylinder, one end of the feeding sleeve is flush with the open end of the positioning cylinder, the other end of the feeding sleeve is detachably connected to the end of the positioning cylinder away from the open end, an installation cavity for installing a sealing ring is formed between the outer peripheral wall of the feeding sleeve and the inner peripheral wall of the positioning cylinder, a spare sealing ring is slidably sleeved on one end of the feeding sleeve, and the pressing tube is sleeved on the feeding sleeve. The other end of the sleeve and the end of the pressing tube away from the open end of the positioning cylinder are fixed with a connecting rod, and the connecting rod is slidably passed through the positioning cylinder. There are multiple groups of connecting rods, and the multiple groups of connecting rods are evenly spaced on the pressing tube. A supporting plate is fixed on the positioning cylinder, and the pressing drive member is fixed on the supporting plate. The pressing plate is fixed on the output end of the pressing drive member. The end of the connecting rod away from the pressing tube is fixedly connected to the pressing plate, and the pressing drive member drives the pressing tube to slide in the positioning cylinder through the connecting rod, thereby pressing the spare sealing ring out of the feeding sleeve.

[0011] By adopting the above technical solution, the replacement parts are set on the deflection plate, and the precise positioning of the lifting arm and the transverse truss is coordinated to realize the fully automatic operation from ring removal, alignment to pressing. The pressing tube is supported by multiple sets of evenly distributed connecting rods and connected to the pressing plate. It is pushed linearly by the pressing drive component and guided pressing is performed inside the positioning cylinder, which can effectively prevent pressing deviation, skewness or jamming, ensure that the sealing ring is accurately loaded into the fixed mold cavity, and ensure the sealing quality of air tightness testing; the feeding sleeve and the positioning cylinder constitute a closed installation cavity, which can be pre-installed with multiple sets of spare sealing rings, and has good sealing ring storage and sliding feeding functions, avoiding manual placement one by one, improving the efficiency of ring replacement, and ensuring that the feeding process is continuous and uninterrupted, and the feeding sleeve and the positioning cylinder are detachable connection structures, which are convenient for rapid replenishment of sealing rings during production maintenance, thereby improving system adaptability and on-site operation and maintenance efficiency.

[0012] Optionally, a mounting groove is provided on the surface of the fixed mold on which the first accommodating groove is provided, and a sealing ring is embedded in the mounting groove, and a lifting ring is provided in the mounting groove for sliding sealing, and the lifting ring divides the mounting groove into two independent chambers, and the two independent chambers are respectively set as the first chamber and the second chamber, the sealing ring is embedded in the first chamber, and a plurality of gas injection pipes are embedded in the fixed mold, one end of the gas injection pipe is connected to the output end of the air pump, and the other end of the gas injection pipe is connected to the second chamber, and when the air pump injects gas into the second chamber, the lifting ring can push the sealing ring out of the first chamber.

[0013] By adopting the above technical solution, a mounting groove is provided on one side of the first accommodating groove of the fixed mold, and a slidable lifting ring is added in the mounting groove to divide the mounting groove into a first chamber and a second chamber, and the air injection pipe is connected to the second chamber. When the sealing ring needs to be replaced, gas can be injected into the second chamber by an air pump, so that the lifting ring is lifted upward under the action of air pressure, thereby automatically ejecting the sealing ring embedded in the first chamber, thereby realizing automatic sealing ring detachment, reducing manual intervention, and greatly improving replacement efficiency; in addition, the lifting process is smooth and uniform, and will not cause mechanical damage to the mold cavity wall or the sealing ring, effectively protecting the mold and sealing surface, and ensuring the sealing accuracy and consistency of the fixture.

[0014] Optionally, the sliding member includes a screw rod, a gear and a rack, a slide rail is fixed on the machine platform, the slide seat is slidably arranged on the slide rail, the screw rod is rotatably arranged on the machine platform, a connecting block is fixed on the slide seat, the connecting block is threadedly connected to the screw rod, the gear is fixed on one end of the screw rod, and an extension portion is fixed on one end of the rack, the extension portion is connected to the output end of the clamping drive member, the rack is meshed with the gear, the first workstation is set at one end of the screw rod close to the mounting seat, and the third workstation is set at one end of the screw rod away from the mounting seat, when the clamping drive member drives the movable mold to approach the fixed mold, the screw rod drives the slide seat to approach the first workstation.

[0015] By adopting the above technical solution, the sliding part is composed of a screw, gear and rack transmission structure, which realizes high-precision reciprocating sliding of the slide between multiple stations. The gear and rack are meshed and connected, and the linear thrust of the clamping drive is converted into screw rotation, thereby indirectly driving the slide to move. The entire structure has good mechanical synchronization. It can not only accurately control the displacement switching of the fixed mold between the first station (pressurization inspection), the second station (visual review), and the third station (sealing ring replacement), greatly improving the inspection rhythm and production efficiency, but also provides additional auxiliary positioning capabilities for the clamping action, enhancing the mechanical stability during the docking process of the movable mold and the fixed mold, and avoiding false airtightness detection due to offset or improper position.

[0016] Optionally, the review component further includes an isolation member, the isolation member includes a sealing ring and an isolation cover, a relief groove is provided on the side of the fixed mold on which the first receiving groove is provided, the sealing ring is slidingly sealed and arranged in the relief groove, the sealing ring is located between the inspection ring and the sealing ring, the isolation cover is sleeved on the sealing ring, the isolation cover is made of a transparent material, and the isolation cover is provided on the inspection ring, the inner peripheral side of the isolation cover is set to an opening, the sealing ring can movably block the inner peripheral side of the isolation cover, and the sealing ring is close to An outer edge is fixedly provided at one end of the isolation cover, and a lifting spring is provided at the other end of the sealing ring. The outer edge is arranged on the inner circumference of the sealing ring, and an avoidance groove is provided on the surface of the movable mold on which the second accommodating groove is provided. The avoidance groove is arranged on the outer circumference of the second accommodating groove, and an annular extrusion portion is fixedly provided in the avoidance groove. A plurality of groups of vent holes are evenly provided on the extrusion portion, and the extrusion portion is movably abutted against the outer edge. One end of the lifting spring is fixedly connected to one end of the sealing ring, and the other end of the lifting spring is fixedly connected to the inner wall of the avoidance groove.

[0017] By adopting the above technical solution, an isolation structure composed of a blocking ring and an isolation cover is provided, which realizes effective physical isolation of the space between the inspection ring and the sealing ring during the visual inspection process. The blocking ring is arranged in the clearance groove and has sliding and sealing functions. One end of the blocking ring is pre-tightened by a lifting spring, and the other end cooperates with the annular extrusion part on the movable mold through the outer edge. When the movable mold is pressed against the fixed mold, the extrusion part presses the blocking ring into the clearance groove. Once helium overflows from the sealing ring, the helium will contact the inspection ring through the vent; when the movable mold is not pressed on the fixed mold, the lifting spring pushes the blocking ring into place. The blocking ring and the isolation cover are combined to form a complete isolation structure, and the blocking ring has an elastic reset function to cooperate with the extrusion part to form a dynamic seal, which can adapt to structural fatigue and displacement deviation under long-term operation and ensure the consistency of the system detection seal; the isolation cover is arranged on the outside of the inspection ring and is made of transparent material. Without affecting visual recognition, it effectively prevents interference caused by factors such as ambient light, dust, and leaked helium, thereby reducing false alarms and false rejections.

[0018] Optionally, a first pressurizing groove is provided on the inner wall of the first receiving groove, an extrusion plate is slidably arranged in the first pressurizing groove, an air supply pipe is embedded in the fixed mold, one end of the air supply pipe is connected to the output end of the air pump, and a bellows-shaped deformation part is provided at the other end of the air supply pipe, the deformation part is arranged in the first pressurizing groove, and the end of the deformation part away from the air pump is fixedly penetrated into the extrusion plate, the air pump is connected to the first receiving groove through the air supply pipe, and a first spring is sleeved on the deformation part, one end of the first spring is connected to the inner wall of the first pressurizing groove, and the other end of the first spring is connected to the extrusion plate.

[0019] By adopting the above technical solution, a first pressurizing groove and a sliding extrusion plate are arranged in the first accommodating groove, providing sufficient space for the pressurizing chamber to ensure that it can withstand and maintain a high-pressure environment, effectively meeting the requirements of high-sensitivity airtightness detection for stable pressurization, and the bellows deformation portion cooperates with the first spring to achieve buffering and flexible adjustment of the pressure in the chamber, thereby ensuring the safety of the sensor during the detection process; at the same time, the extrusion plate has an active exhaust function. When the detection is completed and the pressure needs to be released, the extrusion plate can effectively push and discharge the residual helium in the pressurizing chamber to avoid misjudgment caused by residual gas retention; this structure not only improves the accuracy and repeatability of the detection, but also enhances the reliability and precision of the detection system.

[0020] Optionally, a second pressurizing groove is provided on the inner wall of the second receiving groove, an exhaust plate is slidably arranged in the second pressurizing groove, a second spring is provided between the exhaust plate and the inner wall of the second pressurizing groove, one end of the second spring is connected to the inner wall of the second pressurizing groove, and the other end of the second spring is connected to the exhaust plate, a first ventilation groove is provided on the inner wall of the first receiving groove, and a second ventilation groove is provided on the inner wall of the second receiving groove, when the movable mold is pressed against the fixed mold, the first receiving groove and the second receiving groove are combined to form a pressurizing chamber, and the first ventilation groove and the second ventilation groove are connected to each other.

[0021] By adopting the above technical solution, a second pressurizing groove and an exhaust plate are arranged in the second receiving groove. The structure and function of the second pressurizing groove and the extrusion plate arranged in the first receiving groove are symmetrical and identical, which can effectively adjust the pressure distribution in the pressurized chamber, ensure that the two parts in the chamber are evenly stressed, avoid local stress concentration or sealing failure, and improve the overall sealing effect; the first receiving groove and the second receiving groove are respectively provided with a first ventilation groove and a second ventilation groove, and the two ventilation grooves are connected to each other, ensuring that the gas can flow freely between the two chambers, achieving pressure balance and stability, effectively preventing detection errors caused by uneven pressure, improving the accuracy and repeatability of airtightness detection, and at the same time reducing misjudgment caused by abnormal chamber pressure, further enhancing the reliability and stability of the system, and adapting to the complex and changeable detection environment requirements.

[0022] Optionally, a pick-and-place assembly is further included, which includes a displacement drive, an extension and a second clamp. The displacement drive is arranged on the machine table, and the displacement drive is located on the side of the third workstation away from the first workstation. The extension is arranged on the output end of the displacement drive, and a mounting rod is arranged on the output end of the extension. The second clamp is arranged at one end of the mounting rod, and two groups of the second clamps are provided. The two groups of second clamps are symmetrically arranged along the length direction of the mounting rod.

[0023] By adopting the above technical solution, a displacement-driven pick-and-place component is set up to realize the automated connection between the detection station and the loading and unloading. The symmetrical arrangement of the two sets of second clamps facilitates the stable clamping of the sensor and prevents it from offset or falling, thereby improving the overall automation level and operating efficiency of the system.

[0024] On the other hand, the present application provides an application method for an air tightness detection system of a sensor for a new energy vehicle, which comprises the following steps: S1. The controller controls the displacement driver to drive the second gripper to place the sensor to be tested into the first receiving groove. The pressing driver drives the movable mold to press against the fixed mold. The air pump injects air into the fixture to increase the pressure. The controller monitors the pressure changes in the fixture in real time through the pressure sensor. S2. The pressing drive component drives the movable mold to lift upward, and the fixed mold moves to the second station. The visual camera detects whether the inspection ring has any color change; S3. If the inspection ring does not change color and the pressure sensor does not detect a pressure drop, the controller controls the displacement drive to move the second gripper, removes the inspected sensor and places it into the first discharge port, and simultaneously places the next sensor to be inspected on the fixed mold; S4. If the inspection ring does not change color, but the pressure sensor detects a decrease in pressure, the controller controls the displacement drive to move the second gripper, removes the inspected sensor and places it into the second discharge port, and simultaneously places the next sensor to be inspected on the fixed mold; S5. If red reflected light appears on the inspection ring, the pressing drive further drives the movable mold to lift upward, and the fixed mold moves to the third station. The controller controls the second solenoid valve to open, and the air pump injects air into the second chamber, and the sealing ring on the fixed mold is ejected. S6. The controller controls the lifting arm to move above the third station. The deflection member drives the deflection plate to rotate, causing the second clamping jaw to move above the fixed mold. The second clamping jaw picks up the sealing ring that has been ejected from the fixed mold. The deflection member then drives the deflection plate to deflect in the opposite direction, moving the positioning cylinder to just above the fixed mold. The pressing member is then driven to install the spare sealing ring into the first chamber. S7. The pressing drive component drives the movable mold to press on the fixed mold to re-inspect the sensor for new energy vehicles.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The coordinated structure of the fixed and movable molds in the fixture forms a pressurized chamber for airtightness testing. Together with the sealing ring and pressure sensor, they form a highly reliable airtight sealing and testing unit, ensuring a stable airtight testing environment and precise testing. The clamping drive controls the precise closing of the movable and fixed molds. Combined with the setting of the sliding parts, automated translational conversion between the testing, review, and maintenance stations is achieved, significantly improving the automation level and testing efficiency of the entire machine. During the testing process, the built-in pressure sensor monitors the pressure changes around the sensor in real time. The dual detection mechanism, consisting of a visual camera and a test ring, features extremely high sensitivity and intuitive visual feedback. Combined with a high-resolution visual camera, it forms an intelligent image recognition and judgment system, ensuring that even tiny leaks can be discovered promptly. This enhances the system's micro-leak detection capabilities and realizes the coordinated judgment of air pressure monitoring and helium leak color feedback, effectively reducing the false detection rate and missed detection rate, and improving the safety and reliability of testing. 2. The replacement component is achieved through the coordinated cooperation of the transverse truss, lifting arm, deflection structure and clamping claw mechanism. After completing the sensor air tightness test, the visual camera identifies the color change of the inspection ring. Combined with the abnormal pressure information fed back by the pressure sensor, it is comprehensively judged that there is a leak in the fixture sealing structure, thereby initiating the sealing ring replacement process. The replacement component quickly completes the removal and replacement of the sealing ring, avoiding false detection or missed detection due to aging, damage or improper installation of the sealing ring. Compared with traditional manual disassembly and assembly methods, this structure can automatically identify the replacement position and accurately remove and place the sealing ring, significantly improving replacement efficiency and operating accuracy, and greatly enhancing the automation level, operation continuity and maintenance convenience of the detection system; 3. A mounting groove is set on one side of the first accommodating groove of the fixed mold, and a slidable lifting ring is added in the mounting groove to divide the mounting groove into a first chamber and a second chamber. The air injection pipe is connected to the second chamber. When the sealing ring needs to be replaced, gas can be injected into the second chamber by an air pump to make the lifting ring lift upward under the action of air pressure, thereby automatically ejecting the sealing ring embedded in the first chamber, thereby realizing automatic sealing ring detachment, reducing manual intervention, and greatly improving replacement efficiency; in addition, the lifting process is smooth and uniform, and will not cause mechanical damage to the mold cavity wall or the sealing ring, effectively protecting the mold and sealing surface, and ensuring the sealing accuracy and consistency of the fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the detection system of the embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the overall structure of the drive component of an embodiment of the present application.

[0028] Figure 3 It is a schematic diagram of the half-section structure of the jig implemented in this application.

[0029] Figure 4 It is a structural diagram of the detection system of an embodiment of the present application.

[0030] Figure 5 It is a schematic diagram of the overall structure of the replacement component of the embodiment of the present application.

[0031] Figure 6 It is a schematic diagram of the overall structure of the replacement part of the embodiment of the present application.

[0032] Figure 7 It is a schematic diagram of the overall structure of the pick-and-place assembly of an embodiment of the present application.

[0033] Reference numerals: 1, machine; 11, controller; 12, mounting base; 121, extension plate; 13, slide; 2. Fixture; 21. Fixed mold; 211. First accommodating groove; 212. Mounting groove; 213. Escape groove; 214. First pressurizing groove; 215. Extrusion plate; 216. First vent groove; 22. Moving mold; 221. Second accommodating groove; 222. Escape groove; 223. Extrusion portion; 2231. Vent hole; 224. Second pressurizing groove; 225. Exhaust plate; 226. Second vent groove; 23. Pressure sensor; 24. Lifting ring; 25. Gas injection pipe; 251. Second solenoid valve; 26. Gas delivery pipe; 261. Deformation portion; 262. First solenoid valve; 27. First spring; 28. Second spring 3. Drive assembly; 31. Compressing drive member; 32. Sliding member; 321. Screw; 322. Gear; 323. Rack; 3231. Extension; 33. Air tank; 34. Air pump; 4. Verification assembly; 41. Visual camera; 42. Inspection ring; 43. Isolation piece; 431. Blocking ring; 4311. Outer edge; 432. Isolation cover; 433. Lifting spring; 5. Replacement components; 51. Transverse truss; 511. Moving seat; 52. Lifting arm; 53. Replacement parts; 531. Positioning cylinder; 532. Feeding sleeve; 533. Pressing tube; 534. Pressing plate; 535. Pressing drive member; 536. Connecting rod; 537. Loading plate; 54. First clamping jaw; 55. Deflecting member; 56. Deflecting plate; 6. Pick-and-place assembly; 61. Displacement drive member; 62. Extension member; 63. Second clamping jaw; 64. Mounting rod; 65. Lifting member. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-7 This application is described in further detail.

[0035] The embodiments of the present application disclose an air tightness detection system for sensors used in new energy vehicles.

[0036] First of all, it should be noted that the new energy vehicle sensor involved in this application is a temperature and humidity sensor in the new energy battery pack.

[0037] Reference Figure 1 The air tightness detection system for sensors for new energy vehicles includes a machine 1, a fixture 2, a drive component 3, a review component 4, a replacement component 5, a loading component and a pick-and-place component 6. The drive component 3, the replacement component 5 and the pick-and-place component 6 are all installed on the machine 1. The replacement component 5 is located on one side of the drive component 3, and the pick-and-place component 6 is located on the side of the replacement component 5 away from the drive component 3. The loading component is installed on one side of the machine 1, the fixture 2 is installed on the drive component 3, and the review component 4 is installed on the detection component.

[0038] The machine 1 serves as the installation basis of the entire sensor air tightness detection system, and the fixture 2 can provide the closed environment required for the inspection of the new energy vehicle sensor, isolating it from the external environment; the driving component 3 is used to drive the fixture 2 to open and close, so that the new energy vehicle sensor to be tested can be placed in the fixture 2; the review component 4 verifies the sealing of the fixture 2 when an air tightness defect is detected in the new energy vehicle sensor; the replacement component 5 can actively replace the sealing mechanism provided on the fixture 2; the pick-and-place component 6 can automatically place the new energy vehicle sensor to be tested in the fixture 2, and take away the new energy vehicle sensor that has been tested; the loading component can automatically transport the new energy vehicle sensor to be tested to the position to be tested.

[0039] Reference Figure 2 and Figure 3 In the embodiment of the present application, a controller 11 is provided on the machine 1, and the fixture 2 includes a fixed mold 21, a movable mold 22, a lifting ring 24, a sealing ring, a pressure sensor 23, an air injection pipe 25, an air supply pipe 26, a first spring 27 and a second spring 28. A first accommodating groove 211 and a mounting groove 212 are provided on the outer wall of the fixed mold 21. The shape of the first accommodating groove 211 is adapted to the shape of the sensor for the new energy vehicle to be detected. The mounting groove 212 is set as an annular groove and is located on the outer peripheral side of the first accommodating groove 211. The lifting ring 24 is slidingly sealed and arranged in the mounting groove 212. The lifting ring 24 divides the mounting groove 212 into two independent chambers, and the two independent chambers are respectively set as the first chamber and the second chamber.

[0040] One end of the sealing ring is arranged in the first chamber, and the other end of the sealing ring extends out of the mounting groove 212. The sealing ring is embedded in the fixed mold 21 through the mounting groove 212. An air injection pipe 25 is embedded in the fixed mold 21. One end of the air injection pipe 25 is provided with multiple groups of branch pipes, which are connected to the second chamber, and the multiple groups of branch pipes are arranged at intervals along the circumference direction of the mounting groove 212. When the air injection pipe 25 injects air into the second chamber, the lifting ring 24 will slide upward, thereby pushing the sealing ring out of the first chamber.

[0041] A first pressurizing groove 214 is defined on the bottom wall of the first receiving tank 211. An extrusion plate 215 is slidably mounted within the first pressurizing groove 214. An air supply pipe 26 is embedded within the fixed mold 21. A bellows-shaped deformable portion 261 is disposed at one end of the air supply pipe 26. The deformable portion 261 is disposed within the first pressurizing groove 214, and the end of the deformable portion 261 distal from the pressurizing element is fixedly mounted on the extrusion plate 215. The air supply pipe 26 communicates with the first receiving tank 211 via the deformable portion 261. A first spring 27 is sleeved around the deformable portion 261. One end of the first spring 27 is fixedly connected to the inner wall of the first pressurizing groove 214, and the other end is fixedly connected to the extrusion plate 215. A pressure sensor 23 is fixedly mounted on the extrusion plate 215 and is electrically connected to the controller 11.

[0042] The movable mold 22 is provided with a second receiving groove 221. The shape of the second receiving groove 221 is also adapted to the shape of the new energy vehicle sensor to be tested. The first receiving groove 211 and the second receiving groove 221 can be combined to form a pressurized chamber for performing airtightness testing on the sensor. A second pressurized groove 224 is provided on the inner bottom wall of the second receiving groove 221. An exhaust plate 225 is slidably installed in the second pressurized groove 224. A second spring 28 is installed between the exhaust plate 225 and the inner wall of the second pressurized groove 224. One end of the second spring 28 is fixedly connected to the inner wall of the second pressurized groove 224, and the other end of the second spring 28 is fixedly connected to the exhaust plate 225.

[0043] A first vent groove 216 is provided on the inner wall of the first accommodating groove 211, and a second vent groove 226 is provided on the inner wall of the second accommodating groove 221. When the movable mold 22 is pressed against the fixed mold 21, the first accommodating groove 211 and the second accommodating groove 221 are combined to form a pressurized chamber, and the first vent groove 216 and the second vent groove 226 are connected to each other.

[0044] Reference Figure 2 、 Figure 3 and Figure 4 In the embodiment of the present application, the drive assembly 3 includes a clamping drive member 31, a slide 13, a sliding member 32, an air tank 33 and an air pump 34. A mounting seat 12 is provided on one side of the machine 1 in the length direction, and a first discharge port and a second discharge port are respectively provided on the other side of the machine 1. The first discharge port and the second discharge port are linearly arranged along the width direction of the machine 1. The mounting seat 12 is configured as a "door"-shaped frame. The clamping drive member 31 is fixed on the mounting seat 12. The clamping drive member 31 is configured as an electric push rod. The clamping drive member 31 is electrically connected to the controller 11. A connecting plate is fixed on the output end of the clamping drive member 31, and the side of the movable mold 22 facing away from the second accommodating groove 221 is fixedly connected to the connecting plate.

[0045] The sliding member 32 includes a screw rod 321, a gear 322 and a rack 323. Two sets of slide rails are fixed on the machine 1, and multiple sets of sliders are fixed on the slide 13. The sliders are slidably connected to the slide rails. The slide 13 is slidably set on the slide rails. Multiple sets of rotating seats are fixed on the machine 1. The screw rod 321 is rotatably connected to the rotating seat. The screw rod 321 is rotatably set on the machine 1 through the rotating seat. A connecting block is fixed on the slide 13, and the connecting block is threadedly connected to the screw rod 321. The gear 322 is fixed on one end of the screw rod 321, and an extension portion 3231 is fixed on one end of the rack 323. The extension portion 3231 is fixedly connected to the connecting plate, and the rack 323 meshes with the gear 322.

[0046] A first station, a second station and a third station are respectively arranged on the screw rod 321. The first station is arranged at the end of the screw rod 321 close to the mounting seat 12, the third station is arranged at the end of the screw rod 321 away from the mounting seat 12, and the second station is arranged between the first station and the third station. The first station is set as an air tightness detection station for sensors for new energy vehicles, the second station is set as a station for verifying the sealing of the jig 2, and the third station is set as a station for replacing the sealing ring.

[0047] The gas tank 33 is fixed on the machine 1, and helium is stored in the gas tank 33. The air pump 34 is fixed on the gas tank 33. The air pump 34 is electrically connected to the controller 11, and the controller 11 can control the air pump 34 to exhaust outward or draw air inward. The air pump 34 is provided with a suction end and an output end. The suction end of the air pump 34 is fixed with a connecting pipe, and the air pump 34 is connected to the gas tank 33 through the connecting pipe. The output end of the air pump 34 is fixed with an air supply pipe, and a three-way joint is provided at the end of the air supply pipe away from the air pump 34.

[0048] The end of the air supply pipe 26, remote from the deformable portion 261, is connected to the output of the air pump 34 via a three-way joint. A first solenoid valve 261 is provided on the air supply pipe 26 and is electrically connected to the controller 11. The end of the air injection pipe 25, remote from the branch pipe, is connected to the output of the air pump 34 via a three-way joint. A second solenoid valve 251 is provided on the air injection pipe 25 and is electrically connected to the controller 11. Initially, both the first and second solenoid valves 261 and 251 are closed.

[0049] When the pressing driving member 31 drives the movable mold 22 to move downward in the vertical direction, the slide 13 will be driven by the screw rod 321 to move from the third station to the first station. When the slide 13 arrives at the first station, the movable mold 22 has not yet pressed on the fixed mold 21, and the rack 323 just disengages the gear 322. When the pressing driving member 31 is at the limit position of the extension stroke and the movable mold 22 is completely pressed on the fixed mold 21, the first accommodating groove 211 and the second accommodating groove 221 can be combined to form a pressurized chamber for air tightness testing of sensors for new energy vehicles. Then the first solenoid valve 261 is opened, and the air pump 34 injects air into the pressurized chamber through the air supply pipe 26. The extrusion plate 215 gradually compresses the first spring 27 as the pressure value increases. At the same time, the exhaust plate 225 also compresses the second spring 28 until the pressure in the pressurized chamber reaches the preset pressure value, and then the air injection is stopped. The pressure sensor 23 continuously monitors the pressure change over a period of time. When the inspection is completed, the air pump 34 draws air outwards. As the pressure value decreases, the extrusion plate 215 and the exhaust plate 225 gradually reset. When the clamping drive 31 drives the movable mold 22 to move upward in the vertical direction, the slide 13 will stay at the first station for a period of time. After the extension part 3231 completes its stroke, the rack 323 engages with the gear 322, and the slide 13 slides from the first station to the second station. When the output end of the clamping drive 31 shrinks inward to two-thirds of the total stroke, the slide 13 is exactly in the second station; when the output end of the clamping drive 31 continues to shrink inward, the slide 13 will slide from the second station to the third station.

[0050] Of course, in other embodiments of the present application, the clamping drive member 31 can also be set as a hydraulic cylinder, and the sliding member 32 can also be set as a hydraulic telescopic member. The clamping drive member 31 and the sliding member 32 are connected through an infusion tube, and the output end of the sliding member 32 is fixedly connected to the connecting block. At this time, when the output end of the clamping drive member 31 extends outward, the output end of the sliding drive member contracts inward, so that the fixed mold 21 can switch back and forth between the first station, the second station, and the third station.

[0051] Reference Figure 2 、 Figure 3 and Figure 4 In the embodiment of the present application, the review component 4 includes a test ring 42, an isolator 43, a visual camera 41 and a light source. A support ring is fixed on the fixed mold 21, and the test ring 42 is fixed on the support ring. The test ring 42 is made of zeolite imidazolate skeleton material. The test ring 42 is fixed on the side of the fixed mold 21 where the mounting groove 212 is opened, and the test ring 42 is arranged on the outer peripheral side of the sealing ring. The test ring 42 can react with helium and produce color changes.

[0052] The specific mechanism of action is as follows: Zeolitic imidazolate framework (hereinafter referred to as ZIF-8) is a flexible metal-organic framework material. Its microporous structure efficiently adsorbs small molecules of helium. The helium molecules act on the imidazolate linkers through van der Waals forces, triggering a lattice "breathing effect" and causing the unit cell parameters to expand. The breathing effect refers to the reversible lattice expansion of flexible porous materials (especially metal-organic frameworks) when they adsorb guest molecules. This dynamic deformation is similar to the "breathing" of an organism.

[0053] When ZIF-8 is used as a building block of a photonic crystal, the structural color formed by its periodic arrangement is determined by the position of the photon bandgap, which satisfies the Bragg diffraction condition: the reflection wavelength λ = 2d η eff (d is the lattice constant, η eff is the effective refractive index).

[0054] Lattice expansion directly increases the period length d of the photonic crystal (e.g., the spacing between nanoparticles). According to the Bragg equation, λ is proportional to d, and an increase in d inevitably shifts the reflected wavelength toward longer wavelengths. Although helium adsorption slightly reduces the overall refractive index of the material, the effect of lattice expansion on wavelength dominates. For example, a 0.5% lattice expansion can redshift the 550nm green light reflection peak by approximately 2.75nm. At higher expansion rates (>1%), the reflection peak shifts significantly from the green band (550nm) to the red band (650nm), manifesting macroscopically as a shift in color from green to red. It is important to note that when helium is adsorbed on a ZIF-8 photonic crystal, the wavelength of its reflected light shifts from the green band to the red band. This shift in color from green to red is manifested macroscopically as a shift in the color reflected from the material's surface. This shift is not due to the color of the material itself, but rather to the color of the light reflected from the surface, similar to the rainbow colors seen on the surface of a CD.

[0055] The isolation member 43 includes a sealing ring 431, an isolation cover 432 and a lifting spring 433. The sealing ring 431 is configured as a tubular structure. The fixed mold 21 is provided with a mounting groove 212 on one side and also has a clearance groove 213. The sealing ring 431 is slidingly sealed and arranged in the clearance groove 213. The sealing ring 431 is located between the inspection ring 42 and the sealing ring. The isolation cover 432 is sleeved on the sealing ring 431. The isolation cover 432 is made of transparent material, and the isolation cover 432 is provided on the inspection ring 42. The inner peripheral side of the isolation cover 432 is configured as an opening. The lifting spring 433 is arranged in the clearance groove 213. One end of the lifting spring 433 is fixedly connected to the end of the sealing ring 431 away from the isolation cover 432, and the other end of the lifting spring 433 is fixedly connected to the inner bottom wall of the clearance groove 213.

[0056] In the initial state, the blocking ring 431 completely blocks the opening on the inner circumference of the isolation cover 432 under the action of the lifting spring 433, so that the isolation cover 432 and the blocking ring 431 form a sealing mechanism, and the blocking ring 431 is fixed with an outer edge 4311 on one end close to the isolation cover 432, and the outer edge 4311 is arranged on the inner circumference of the blocking ring 431, and the side of the movable mold 22 on which the second receiving groove 221 is opened is provided with an avoidance groove 222, and the avoidance groove 222 is arranged on the second receiving groove On the outer peripheral side of the groove 221, an extrusion portion 223 is fixed in the avoidance groove 222. The extrusion portion 223 is arranged in a ring shape, and a plurality of groups of ventilation holes 2231 are opened on the extrusion portion 223. The ventilation holes 2231 are evenly distributed on the extrusion portion 223. The end of the extrusion portion 223 away from the movable mold 22 can be movably abutted against the outer edge 4311. When the movable mold 22 is pressed on the fixed mold 21, the extrusion portion 223 will press the blocking portion into the avoidance groove 213. At this time, the extrusion portion 223 is located between the blocking ring 431 and the sealing ring.

[0057] When performing air tightness testing on the new energy vehicle sensor, the movable mold 22 is pressed against the fixed mold 21, and the pressure sensor 23 arranged on the fixed mold 21 detects that the pressure in the pressurized chamber decreases. Generally, if there is a flaw in the air tightness setting of the new energy vehicle sensor, part of the helium injected into the pressurized chamber will enter the new energy vehicle sensor, thereby causing the pressure in the pressurized chamber to decrease; however, if the sealing ring between the movable mold 22 and the fixed mold 21 is worn or deformed, resulting in insufficient sealing of the jig 2, the helium in the pressurized chamber overflows, and the pressure in the pressurized chamber will also decrease. In this case, the accuracy of the air tightness testing of the new energy vehicle sensor will be seriously affected.

[0058] Therefore, the inspection ring 42 provided on the fixed mold 21 can perform a review test on the air tightness of the jig 2. Once helium overflows, the overflowed helium will come into contact with the inspection ring 42, causing the inspection medium on the inspection ring 42 to absorb the helium and causing the color of the reflected light on the surface of the inspection medium to change.

[0059] An extension plate 121 is fixedly mounted on the side of the mounting base 12 facing away from the first station. A visual camera 41 is mounted on the extension plate 121, facing the second station. The visual camera 41 is electrically connected to the controller 11. A light source is fixedly mounted on the side of the extension plate 121 facing away from the mounting base 12. The light source is configured as a light strip formed by a combination of multiple linearly arranged LED lamp beads, covered by a transparent lampshade. The light source is electrically connected to the controller 11, which can control the LED lamp beads on the light strip to light up in sequence, thereby forming a moving light source above the inspection ring 42, allowing the visual camera 41 to detect changes in its reflected light.

[0060] Reference Figure 5 and Figure 6 In the embodiment of the present application, the replacement component 5 includes a transverse truss 51, a lifting arm 52, a deflection member 55, a deflection plate 56, a replacement member 53 and a first clamp 54. The transverse truss 51 is arranged on the side of the third station away from the second station. A moving seat 511 is slidingly arranged on the transverse truss 51, and the lifting arm 52 is lifted and lowered on the moving seat 511. Two groups of servo motors are installed on the moving seat 511. One group of servo motors is used to drive the moving seat 511 to move back and forth on the transverse truss 51, and the other group of servo motors is used to drive the lifting arm 52 to move up and down and slide on the moving seat 511. Both groups of servo motors are electrically connected to the controller 11.

[0061] The deflection member 55 is arranged at one end of the lifting arm 52 close to the machine 1. In this embodiment, the deflection member 55 is arranged as a rotary cylinder, and a deflection plate 56 is fixedly provided on the output end of the rotary cylinder, and the center position of the deflection plate 56 is fixedly connected to the rotating output end of the deflection member 55. The replacement part 53 is arranged at one end of the deflection plate 56, and the first clamping jaw 54 is arranged at the other end of the deflection plate 56. The first clamping jaw 54 can be set as an electric clamping jaw.

[0062] Of course, in other embodiments of the present application, the deflection member 55 can also be set as other types of rotating mechanisms. For example, the deflection member 55 can be set as a motor gear set mechanism, that is, the motor is fixed at the end of the lifting arm 52 close to the machine 1, and the gear set includes a driving gear and a driven gear. The driving gear is fixed on the output end of the motor, and a rotating shaft is fixed on the deflection plate 56. The deflection plate 56 is rotated by the rotating shaft and is set on the end face of the lifting arm 52 close to the machine 1. The driven gear is coaxially fixed on the rotating shaft, the driving gear is engaged with the driven gear, and the motor is electrically connected to the controller 11, so that the switching between the replacement part 53 and the first clamp 54 can be realized.

[0063] Reference Figure 6In the embodiment of the present application, the replacement part 53 includes a positioning cylinder 531, a feeding sleeve 532, a pressing tube 533, a pressing plate 534 and a pressing drive member 535. The positioning cylinder 531 is fixed to the end of the deflection plate 56 away from the first clamping jaw 54. The positioning cylinder 531 is hollow and one end is open. The feeding sleeve 532 is coaxially arranged in the positioning cylinder 531. The end of the feeding sleeve 532 away from the deflection plate 56 is flush with the open end of the positioning cylinder 531. The other end of the feeding sleeve 532 is connected to one end of the open end of the positioning cylinder 531. The feeding sleeve 532 is detachably connected by bolts, and an installation cavity for installing a sealing ring is formed between the outer peripheral wall of the feeding sleeve 532 and the inner peripheral wall of the positioning cylinder 531. The spare sealing ring for replacement is sleeved on the feeding sleeve 532. At the same time, in order to ensure the stability of the spare sealing ring on the replacement part 53, the outer peripheral wall of the feeding sleeve 532 is provided with a certain taper, that is, the end of the feeding sleeve 532 away from the deflection plate 56 is closed toward the other end of the feeding sleeve 532, and the circumference of the end of the feeding sleeve 532 away from the deflection plate 56 is slightly larger than the circumference of the sealing ring in its natural state.

[0064] The pressing tube 533 is sleeved on the feeding sleeve 532, and a connecting rod 536 is fixed on the end of the pressing tube 533 away from the open end of the positioning cylinder 531. The connecting rod 536 is slidably passed through the positioning cylinder 531. There are multiple groups of connecting rods 536, and the multiple groups of connecting rods 536 are evenly spaced at one end of the pressing tube 533. A supporting plate 537 is fixed on the outer peripheral wall of the positioning cylinder 531. The supporting plate 537 is set as a "door" shaped plate, and the pressing drive member 535 is fixed on the supporting plate 537. The pressing drive member 535 can also be set as an electric push rod. The pressing drive member 535 is electrically connected to the controller 11. The pressing drive member 535 is mounted on the end of the positioning cylinder 531 away from the outlet through the supporting plate 537. The pressing plate 534 is fixed on the output end of the pressing drive member 535. The end of the connecting rod 536 away from the pressing tube 533 is fixedly connected to the pressing plate 534. The pressing drive member 535 drives the pressing tube 533 to slide in the positioning cylinder 531 through the connecting rod 536.

[0065] More specifically, when the visual camera 41 detects the color change on the inspection ring 42, the controller 11 controls the pressing drive 31 to retract to the stroke limit position, and the slide 13 slides from the second station to the third station. At the same time, the controller 11 controls the second solenoid valve 251 to open, and the air pump 34 injects air into the second chamber through the air injection pipe 25. The sealing ring on the fixed mold 21 is pushed out of the first chamber. At the same time, the lifting arm 52 moves to the top of the third station, and the deflection member 55 drives the deflection member 55 to rotate. The rotating plate 56 rotates, switching the first clamping jaw 54 to the top of the fixed mold 21, and then controlling the lifting arm 52 to rise and fall so that the first clamping jaw 54 clamps the sealing ring. The deflection member 55 deflects in the opposite direction, switching the positioning cylinder 531 to the top of the fixed film. The lifting arm 52 moves downward so that the open side of the positioning cylinder 531 presses on the fixed mold 21, and the installation cavity is connected to the installation cavity. The pressing driving member 535 drives the pressing tube 533 to move downward, pressing the spare sealing ring mounted on the feeding sleeve 532 into the installation groove 212. Then the lifting arm 52 is lifted upward and moved to one end of the transverse truss 51. The clamping drive 31 drives the movable mold 22 to move downward. At the same time, the fixed mold 21 is switched from the third station to the first station. The air tightness test of the new energy vehicle sensor is performed again. If the pressure in the pressurized chamber still decreases, it indicates that the air tightness of the new energy vehicle sensor is insufficient.

[0066] Reference Figure 7 In the embodiment of the present application, the feeding component is configured as a vibration plate, which is installed on one side of the machine 1. A feeding end is provided on the vibration plate, and the feeding end is located on one side of the second station. The pick-and-place assembly 6 includes a displacement drive 61, an extension 62, a lifting member 65, a mounting rod 64 and a second clamp 63. The displacement drive 61 is arranged on the machine table 1. The displacement drive 61 is arranged as a linear motor. The displacement drive 61 is electrically connected to the controller 11. The displacement drive 61 is located on the side of the transverse truss 51 away from the mounting frame. The extension 62 can also be set as an electric push rod. The extension 62 is arranged on the output end of the displacement drive 61. A lifting member 65 is arranged on the output end of the extension 62. The lifting member 65 is set as a short-stroke linear motor. The mounting rod 64 is fixed on the output end of the lifting member 65, and the middle position of the mounting rod 64 is connected to the output end of the lifting member 65. The second clamp 63 can also be set as an electric clamp. The second clamp 63 is arranged at one end of the mounting rod 64. There are two groups of second clamps 63, and the two groups of second clamps 63 are symmetrically arranged along the length direction of the mounting rod 64.

[0067] It should be noted here that although the first clamp 54 and the second clamp 63 are both configured as electric clamps, they are different in size. The first clamp 54 is used to clamp the sealing ring on the fixed mold 21, while the second clamp 63 is used to clamp the sensor for new energy vehicles.

[0068] In more detail, after the air tightness test of the sensor for new energy vehicles is completed, the fixed mold 21 will move to the second workstation. At this time, the displacement driving member 61 drives the extension member 62 to move to one end of the displacement driving member 61, and the output end of the extension member 62 extends outward. The lifting member 65 lifts the mounting rod 64 upward, and the second clamping claws 63 installed at both ends of the mounting rod 64 will respectively clamp the sensor to be tested on the feeding end of the vibration plate and the sensor that has been tested on the fixed mold 21. The displacement driving member 61 drives the extension member 62 to move to the other end of the displacement driving member 61, and the lifting member 65 drives the mounting rod 64 to move downward, so that the sensor to be tested is placed on the fixed mold 21, and the sensor that has been tested is placed into the unloading port set on the machine 1.

[0069] The implementation principle of the air tightness testing system for new energy vehicle sensors of the embodiment of the present application is as follows: first, the new energy vehicle sensor to be tested is placed on the fixed mold 21, the pressing drive 31 presses the movable mold 22 against the fixed mold 21, and the air pump 34 injects helium into the pressurized chamber to pressurize it. The controller 11 continuously monitors the pressure changes in the pressurized chamber through the pressure sensor 23; When the pressure in the pressurized chamber is detected to be reduced, the clamping drive 31 drives the movable mold 22 to rise, and the fixed mold 21 moves to the second station to perform a sealing test on the jig 2. At this time, if the visual camera 41 detects that there is no color change on the inspection ring 42, the second clamping jaw 63 delivers the inspected sensor to the first discharge port, and simultaneously places the next sensor to be inspected on the fixed mold 21. When the visual camera 41 detects that a certain place or multiple places on the inspection ring 42 have changed in color, that is, red reflected light appears on the inspection ring 42, the pressing drive member 31 drives the movable mold 22 to continue to lift, and the fixed mold 21 moves to the third station. The controller 11 controls the lifting arm 52 to move above the third station. At the same time, the second solenoid valve 251 is opened, and the air pump 34 injects air into the second chamber through the air injection pipe 25 and the branch pipe. The sealing ring on the fixed mold 21 is pushed out of the first chamber, and the deflection member 55 drives the deflection plate 56 to rotate to move the second clamping jaw 63 to above the fixed mold 21. The second clamping jaw 63 clamps the sealing ring pushed out of the fixed mold 21, and then the deflection member 55 drives the deflection plate 56 to deflect in the opposite direction, moves the positioning cylinder 531 to just above the fixed mold 21, and drives the pressing drive member 535 to install the spare sealing ring into the first chamber; Then the pressing driving member 31 drives the movable mold 22 to move downward, the fixed mold 21 moves to the first working position, the movable mold 22 is pressed on the fixed mold 21, and the air pump 34 injects air into the pressurized chamber through the air pipe 26 to re-check the air tightness of the sensor.

[0070] The present application also discloses an application method of a new energy vehicle sensor air tightness detection system, which includes the following steps: S1. The controller 11 controls the displacement driver 61 to drive the second clamping jaw 63 to place the sensor to be tested into the first receiving groove 211. The pressing driver 31 drives the movable mold 22 to press against the fixed mold 21. The air pump 34 injects air into the fixture 2 to increase the pressure. The controller 11 monitors the pressure changes in the fixture 2 in real time through the pressure sensor 23. S2, the pressing drive member 31 drives the movable mold 22 to lift upward, the fixed mold 21 moves to the second station, and the visual camera 41 detects whether the inspection ring 42 has any color change; S3. If the inspection ring 42 does not change color and the pressure sensor 23 does not detect a pressure drop, the controller 11 controls the displacement driver 61 to move the second clamping jaw 63, removes the inspected sensor and places it into the first discharge port, and simultaneously places the next sensor to be inspected on the fixed mold 21. S4. If the inspection ring 42 does not change color, but the pressure sensor 23 detects a pressure drop, the controller 11 controls the displacement driver 61 to move the second clamping jaw 63, removes the inspected sensor, and places it into the second discharge port. Meanwhile, the next sensor to be inspected is placed on the fixed mold 21. S5. If red reflected light appears on the inspection ring 42, the pressing drive member 31 further drives the movable mold 22 to lift upward, and the fixed mold 21 moves to the third position. The controller 11 controls the second solenoid valve 251 to open, and the air pump 34 injects air into the second chamber, and the sealing ring on the fixed mold 21 is ejected. S6. The controller 11 controls the lifting arm 52 to move above the third station. The deflection member 55 drives the deflection plate 56 to rotate, causing the second clamping jaw 63 to move above the fixed mold 21. The second clamping jaw 63 clamps the sealing ring that is ejected from the fixed mold 21. Then, the deflection member 55 drives the deflection plate 56 to deflect in the opposite direction, moving the positioning cylinder 531 to just above the fixed mold 21, and driving the pressing driving member 535 to install the spare sealing ring into the first chamber. S7. The pressing driving member 31 drives the movable mold 22 to press against the fixed mold 21 to re-inspect the sensor for new energy vehicles.

[0071] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A new energy vehicle sensor air tightness detection system, characterized in that: include: A machine platform, wherein a controller is provided on the machine platform; A fixture comprising a fixed mold and a movable mold, wherein the fixed mold is provided with a first receiving groove, a sealing ring is embedded on a surface of the fixed mold having the first receiving groove, and the movable mold is provided with a second receiving groove, wherein the first receiving groove and the second receiving groove can be combined to form a pressurized chamber for performing airtightness testing on a sensor, a pressure sensor is provided in the first receiving groove, and the pressure sensor is electrically connected to the controller; The driving assembly includes a pressing driving member, a sliding member and an air storage tank. A mounting seat is provided on the machine platform. The pressing driving member is fixed on the mounting seat. The sliding member is provided on the machine platform. The pressing driving member is transmission-connected to the sliding member. The sliding member is respectively provided with a first station, a second station and a third station. The first station is provided at one end of the sliding member, the third station is provided at the other end of the sliding member, and the second station is provided between the first station and the third station. A sliding seat is slidingly provided on the machine platform. The sliding seat is connected to the output end of the sliding member. The movable mold is fixedly mounted on the slide, and the movable mold is fixedly mounted on the output end of the pressing drive member. The gas storage tank is arranged on the machine platform, and helium is stored in the gas storage tank. An air pump is provided on the gas storage tank, and the air pump is electrically connected to the controller. The output end of the air pump is communicated with the pressurized chamber. When the pressing drive member drives the movable mold to approach the fixed mold, the slide is driven by the sliding member to approach the first station. A review component includes a visual camera and an inspection ring. An extension plate is fixed to one side of the mounting seat. The visual camera is arranged on the extension plate, and the visual camera is facing the second workstation. The visual camera is electrically connected to the controller. The inspection ring is arranged on the outer peripheral side of the sealing ring. The inspection ring is made of zeolite imidazolate framework material. The inspection ring can produce color changes under the action of helium, and the visual camera can detect the color change on the inspection ring.

2. The air tightness detection system for a sensor for a new energy vehicle according to claim 1, characterized in that: It also includes a replacement component, which includes a transverse truss, a lifting arm, a replacement part and a first clamp. The transverse truss is arranged on the side of the third workstation away from the second workstation. A movable seat is slidingly arranged on the transverse truss. The lifting arm is lifted and lowered on the movable seat. A deflection part is provided at one end of the lifting arm close to the machine. A deflection plate is provided on the output end of the deflection part. The replacement part is arranged at one end of the deflection plate. The first clamp is arranged at the other end of the deflection plate. The second clamp is used to remove the sealing ring on the fixed mold. The replacement part is used to install a spare sealing ring for the fixed mold.

3. The air tightness detection system for a sensor for a new energy vehicle according to claim 2, characterized in that: The replacement part includes a positioning cylinder, a feeding sleeve, a pressing tube, a pressing plate and a pressing drive part, the positioning cylinder is fixedly arranged at the end of the deflection plate away from the first clamping claw, the one end of the positioning cylinder is open, the feeding sleeve is coaxially arranged in the positioning cylinder, one end of the feeding sleeve is flush with the open end of the positioning cylinder, the other end of the feeding sleeve is detachably connected to the end of the positioning cylinder away from the open end, an installation cavity for installing a sealing ring is formed between the outer peripheral wall of the feeding sleeve and the inner peripheral wall of the positioning cylinder, a spare sealing ring is slidably sleeved on one end of the feeding sleeve, the pressing tube is sleeved on the feeding sleeve The other end, and the end of the pressing tube away from the open end of the positioning tube is fixed with a connecting rod, the connecting rod is slidably passed through the positioning tube, and there are multiple groups of connecting rods, and the multiple groups of connecting rods are evenly spaced on the pressing tube, a supporting plate is fixed on the positioning tube, the pressing drive member is fixed on the supporting plate, and the pressing plate is fixed on the output end of the pressing drive member, the end of the connecting rod away from the pressing tube is fixedly connected to the pressing plate, and the pressing drive member drives the pressing tube to slide in the positioning tube through the connecting rod, thereby pressing the spare sealing ring out of the feeding sleeve.

4. The air tightness detection system for a sensor for a new energy vehicle according to claim 3, characterized in that: The fixed mold has a mounting groove on one side where the first accommodating groove is provided, and a sealing ring is embedded in the mounting groove. A lifting ring is provided in the mounting groove for sliding sealing. The lifting ring divides the mounting groove into two independent chambers, and the two independent chambers are respectively set as a first chamber and a second chamber. The sealing ring is embedded in the first chamber, and a plurality of gas injection pipes are embedded in the fixed mold. One end of the gas injection pipe is connected to the output end of the air pump, and the other end of the gas injection pipe is connected to the second chamber. When the air pump injects gas into the second chamber, the lifting ring can push the sealing ring out of the first chamber.

5. The air tightness detection system for a sensor for a new energy vehicle according to claim 1, characterized in that: The sliding member includes a screw rod, a gear and a rack, a slide rail is fixed on the machine platform, the slide seat is slidably arranged on the slide rail, the screw rod is rotatably arranged on the machine platform, a connecting block is fixed on the slide, the connecting block is threadedly connected to the screw rod, the gear is fixed on one end of the screw rod, and an extension portion is fixed on one end of the rack, the extension portion is connected to the output end of the clamping drive member, the rack is meshed with the gear, the first station is set at one end of the screw rod close to the mounting seat, and the third station is set at one end of the screw rod away from the mounting seat, when the clamping drive member drives the movable mold to approach the fixed mold, the screw rod drives the slide seat to approach the first station.

6. The air tightness detection system for a sensor for a new energy vehicle according to claim 1, characterized in that: The review component also includes an isolation member, which includes a sealing ring and an isolation cover. A clearance groove is provided on the side of the fixed mold where the first receiving groove is provided. The sealing ring is slidingly sealed in the clearance groove. The sealing ring is located between the inspection ring and the sealing ring. The isolation cover is sleeved on the sealing ring. The isolation cover is made of a transparent material and is provided on the inspection ring. The inner peripheral side of the isolation cover is set as an opening. The sealing ring can movably block the inner peripheral side of the isolation cover. The sealing ring is close to the An outer edge is fixedly provided at one end of the isolation cover, and a lifting spring is provided at the other end of the sealing ring. The outer edge is arranged on the inner circumference of the sealing ring, and an avoidance groove is provided on the surface of the movable mold on which the second accommodating groove is provided. The avoidance groove is arranged on the outer circumference of the second accommodating groove, and an annular extrusion portion is fixed in the avoidance groove. A plurality of groups of vent holes are evenly provided on the extrusion portion, and the extrusion portion is movably abutted against the outer edge. One end of the lifting spring is fixedly connected to one end of the sealing ring, and the other end of the lifting spring is fixedly connected to the inner wall of the avoidance groove.

7. The air tightness detection system for a sensor for a new energy vehicle according to claim 1, characterized in that: A first pressurizing groove is provided on the inner wall of the first accommodating groove, an extrusion plate is slidably arranged in the first pressurizing groove, an air supply pipe is embedded in the fixed mold, one end of the air supply pipe is connected with the output end of the air pump, and a bellows-shaped deformation part is provided at the other end of the air supply pipe, the deformation part is arranged in the first pressurizing groove, and the end of the deformation part away from the air pump is fixedly penetrated on the extrusion plate, the air pump is connected with the first accommodating groove through the air supply pipe, and a first spring is sleeved on the deformation part, one end of the first spring is connected to the inner wall of the first pressurizing groove, and the other end of the first spring is connected to the extrusion plate.

8. The air tightness detection system for a sensor for a new energy vehicle according to claim 7, characterized in that: A second pressurizing groove is provided on the inner wall of the second receiving groove, an exhaust plate is slidably arranged in the second pressurizing groove, a second spring is provided between the exhaust plate and the inner wall of the second pressurizing groove, one end of the second spring is connected to the inner wall of the second pressurizing groove, and the other end of the second spring is connected to the exhaust plate, a first vent groove is provided on the inner wall of the first receiving groove, and a second vent groove is provided on the inner wall of the second receiving groove, when the movable mold is pressed against the fixed mold, the first receiving groove and the second receiving groove are combined to form a pressurizing chamber, and the first vent groove and the second vent groove are connected to each other.

9. The air tightness detection system for a sensor for a new energy vehicle according to claim 1, characterized in that: It also includes a pick-and-place assembly, which includes a displacement drive, an extension piece and a second clamp. The displacement drive is arranged on the machine table, and the displacement drive is located on the side of the third station away from the first station. The extension piece is arranged on the output end of the displacement drive, and a mounting rod is arranged on the output end of the extension piece. The second clamp is arranged at one end of the mounting rod, and two groups of the second clamps are provided. The two groups of the second clamps are symmetrically arranged along the length direction of the mounting rod.

10. An application method for the air tightness detection system of a sensor for a new energy vehicle according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. The controller controls the displacement driver to drive the second gripper to place the sensor to be tested into the first receiving groove. The pressing driver drives the movable mold to press against the fixed mold. The air pump injects air into the fixture to increase the pressure. The controller monitors the pressure changes in the fixture in real time through the pressure sensor. S2. The pressing drive component drives the movable mold to lift upward, and the fixed mold moves to the second station. The visual camera detects whether the inspection ring has any color change; S3. If the inspection ring does not change color and the pressure sensor does not detect a pressure drop, the controller controls the displacement drive to move the second gripper, removes the inspected sensor and places it into the first discharge port, and simultaneously places the next sensor to be inspected on the fixed mold; S4. If the inspection ring does not change color, but the pressure sensor detects a decrease in pressure, the controller controls the displacement drive to move the second gripper, removes the inspected sensor and places it into the second discharge port, and simultaneously places the next sensor to be inspected on the fixed mold; S5. If red reflected light appears on the inspection ring, the pressing drive further drives the movable mold to lift upward, and the fixed mold moves to the third station. The controller controls the second solenoid valve to open, and the air pump injects air into the second chamber, and the sealing ring on the fixed mold is ejected. S6. The controller controls the lifting arm to move above the third station. The deflection member drives the deflection plate to rotate, causing the second clamping jaw to move above the fixed mold. The second clamping jaw picks up the sealing ring that has been ejected from the fixed mold. The deflection member then drives the deflection plate to deflect in the opposite direction, moving the positioning cylinder to just above the fixed mold. The pressing member is then driven to install the spare sealing ring into the first chamber. S7. The pressing drive component drives the movable mold to press on the fixed mold to re-inspect the sensor for new energy vehicles.

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