Multi-station differential pressure helium leak testing machine

Abstract

The utility model discloses a multi -position differential pressure helium detection testing machine belongs to precision nondestructive testing technical field, including frame, the inside middle one side of frame is provided with helium mass spectrum detection module, and one side of helium mass spectrum detection module is provided with differential pressure test module, and the inside upper end of frame is installed with work piece transplanting subassembly, and one side of frame is provided with the feeding support frame, and the upper end of feeding support frame is installed with the material return conveyor belt, and the drive end of material return conveyor belt is installed with drive motor no.

Description

Technical Field

[0001] This utility model belongs to the field of precision non-destructive testing technology, specifically relating to a multi-station differential pressure helium testing machine. Background Technology

[0002] In many high-end products, such as battery pack cooling plates in new energy vehicles, bipolar plates in fuel cells, certain valve bodies, or precision containers, the structure contains two or more cavities that require independent sealing. Traditional leak detection methods face significant challenges. 1. Low efficiency: If two independent devices (such as a differential pressure gauge and a helium detector) are used to test the two cavities respectively, the workpiece needs to be loaded and unloaded, clamped and transferred multiple times, which is extremely inefficient.

[0003] 2. High cost: Purchasing and maintaining multiple devices is costly and requires a large area.

[0004] 3. Inefficient process: The two chambers may have different importance or allowable leakage rates. For example, chamber A may have a higher allowable leakage rate, making it suitable for rapid and inexpensive differential pressure testing; chamber B requires extremely high sealing performance and must use a high-precision helium detection method. Existing equipment cannot intelligently combine these two methods in a single process.

[0005] 4. Interference risk: During separate testing, the pressurization or vacuuming process of one cavity may cause stress to another cavity that has already been tested, leading to misjudgment.

[0006] Therefore, there is an urgent need for a dedicated solution that can automatically perform sequential testing of different detection methods on a single device, taking into account the characteristics of multi-cavity workpieces. Utility Model Content

[0007] To address the problems mentioned in the background section, this invention provides a multi-station differential pressure helium detector, characterized by accurate, efficient, and highly reliable testing.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a multi-station differential pressure helium testing machine, including a frame, a helium mass spectrometry detection module is arranged on one side of the middle of the frame, a differential pressure testing module is arranged on one side of the helium mass spectrometry detection module, a workpiece transfer assembly is installed at the upper end of the frame, a feeding support frame is arranged on one side of the frame, a discharge conveyor belt is installed at the upper end of the feeding support frame, a drive motor is installed at the drive end of the discharge conveyor belt, a feeding conveyor belt is installed at the upper end of the discharge conveyor belt, a workpiece fixing groove is opened inside the feeding conveyor belt, a workpiece is placed at the upper end of the feeding conveyor belt, a discharging support frame is arranged on the side of the frame away from the feeding support frame, a discharging conveyor belt is installed at the upper end of the discharging support frame, and a drive motor is installed at the drive end of the discharging conveyor belt.

[0009] Preferably, the workpiece transfer assembly includes a lead screw module, which is installed through the upper part of the machine frame. A servo motor is installed at the output end of the lead screw module. A second transfer robot is installed on one side of the lead screw module, and a first transfer robot is installed on one side of the second transfer robot.

[0010] Preferably, the second transplanting robot includes a guiding device, which is installed on one side of the lead screw module. The guide device contains a motor lead screw module, and a motion drag chain is connected to one side of the motor lead screw module. A connecting joint is provided at the bottom end of the motor lead screw module, and an mounting plate is installed at the bottom end of the connecting joint. Wide-type finger cylinders are fixed on both sides of the bottom end of the mounting plate, and a finger clamp is fixed at the output end of the wide-type finger cylinder.

[0011] Preferably, the helium mass spectrometry detection module includes a base plate, which is fixed in the middle of the frame. A wide-type finger cylinder II is installed on one side of the upper end of the base plate. A mounting bracket is provided on one side of the wide-type finger cylinder II. A slide rail is installed at the bottom end of the mounting bracket. A slider is provided inside the slide rail. A thin-type cylinder is provided on the side of the mounting bracket away from the wide-type finger cylinder II. A lateral movable plate is fixed to the output end of the thin-type cylinder. A vent is provided at the clamping rod of the output end of the wide-type finger cylinder II.

[0012] Preferably, optical sensors are installed at the ends of both the unloading conveyor belt and the loading conveyor belt.

[0013] Preferably, one end of the vent is connected to a vacuum pumping system.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. Extremely high specialization efficiency: Designed specifically for dual-cavity workpieces, the testing process is seamlessly connected, improving efficiency several times compared to using multiple devices for step-by-step testing.

[0015] 2. Optimal combination of cost and performance: By using the low-cost differential pressure method for chambers with lower requirements and the high-cost helium detection method for chambers with extremely high requirements, the optimal combination of economy and technology of the detection scheme is achieved.

[0016] 3. Intelligent process control: Based on the test results of the first chamber, the system automatically decides whether to conduct a second chamber test, avoiding unnecessary helium consumption and time waste, and achieving true intelligent detection.

[0017] 4. Ensure test independence: Sequential testing and testing of different chambers completely avoid gas path or pressure interference between the two test processes, resulting in more reliable results.

[0018] 5. Integration and Automation: A single device completes all operations, has a small footprint, a high degree of automation, and can be easily integrated into automated production lines. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the workpiece transfer assembly structure of this utility model; Figure 3 This is a schematic diagram of the transplanting robot of this utility model; Figure 4 This is a schematic diagram of the helium mass spectrometry detection module of this utility model; Figure 5 This is a schematic diagram of the feeding conveyor belt structure of this utility model; Figure 6 This is a schematic diagram of the material feeding conveyor belt structure of this utility model.

[0020] In the diagram: 1. Unloading conveyor belt; 2. Workpiece transfer assembly; 21. Servo motor; 22. Screw module; 23. Transfer robot arm II; 231. Finger gripper; 232. Wide-type finger cylinder I; 233. Motion cable chain; 234. Motor screw module; 235. Guide device; 236. Mounting plate; 237. Connecting joint; 24. Transfer robot arm I; 3. Frame; 4. Loading conveyor belt; 5. Unloading conveyor belt; 6. Differential pressure testing module; 7. Helium mass spectrometry detection module; 71. Vent; 72. Wide-type finger cylinder II; 73. Slide rail; 74. Slider; 75. Mounting frame; 76. Thin cylinder; 77. Lateral movable plate; 78. Base plate; 8. Workpiece fixing groove; 9. Workpiece; 10. Drive motor I; 11. Loading support frame; 12. Unloading support frame; 13. Drive motor II. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-6This utility model provides the following technical solution: a multi-station differential pressure helium testing machine, including a frame 3, a helium mass spectrometry detection module 7 is arranged on one side of the middle of the frame 3, a differential pressure testing module 6 is arranged on one side of the helium mass spectrometry detection module 7, a workpiece transfer assembly 2 is installed at the upper end of the frame 3, a feeding support frame 11 is arranged on one side of the frame 3, a material unloading conveyor belt 5 is installed at the upper end of the feeding support frame 11, a drive motor 10 is installed at the drive end of the material unloading conveyor belt 5, a feeding conveyor belt 4 is installed at the upper end of the material unloading conveyor belt 5, a workpiece fixing groove 8 is opened inside the feeding conveyor belt 4, a workpiece 9 is placed at the upper end of the feeding conveyor belt 4, a material unloading support frame 12 is arranged on the side of the frame 3 away from the feeding support frame 11, a material unloading conveyor belt 1 is installed at the upper end of the material unloading support frame 12, and a drive motor 13 is installed at the drive end of the material unloading conveyor belt 1.

[0023] Specifically, the workpiece transfer assembly 2 includes a lead screw module 22, which is installed through the upper part of the machine frame 3. A servo motor 21 is installed at the output end of the lead screw module 22. A second transfer robot 23 is installed on one side of the lead screw module 22, and a first transfer robot 24 is provided on one side of the second transfer robot 23.

[0024] By adopting the above technical solution, the transfer robot 23 and the transfer robot 24 work together to ensure that the workpiece 9 is transported in an orderly manner during differential pressure testing and helium mass spectrometry testing, thereby improving the testing efficiency.

[0025] Specifically, the transplanting robot 23 includes a guide device 235, which is installed on one side of the lead screw module 22. Inside the guide device 235, there is a motor lead screw module 234. A motion drag chain 233 is connected to one side of the motor lead screw module 234. A connecting joint 237 is provided at the bottom end of the motor lead screw module 234. An mounting plate 236 is installed at the bottom end of the connecting joint 237. Wide-type finger cylinders 232 are fixed on both sides of the bottom end of the mounting plate 236. A finger clamp 231 is fixed at the output end of the wide-type finger cylinder 232.

[0026] By adopting the above technical solution, the motor screw module 234 is connected to the mounting plate 236 through the connecting joint 237. The operation of the motor screw module 234 drives the mounting plate 236 to move vertically, and the wide-type finger cylinder 232 works to realize the clamping function of the workpiece 9. The guide device 235 provides guidance for the motor screw module 234 to move vertically.

[0027] Specifically, the helium mass spectrometry detection module 7 includes a base plate 78. The base plate 78 is fixed in the middle of the frame 3. A wide-type finger cylinder 72 is installed on one side of the upper end of the base plate 78. A mounting bracket 75 is provided on one side of the wide-type finger cylinder 72. A slide rail 73 is installed at the bottom of the mounting bracket 75. A slider 74 is provided inside the slide rail 73. A thin cylinder 76 is provided on the side of the mounting bracket 75 away from the wide-type finger cylinder 72. A lateral movable plate 77 is fixed at the output end of the thin cylinder 76. A vent 71 is opened at the clamping rod of the output end of the wide-type finger cylinder 72.

[0028] By adopting the above technical solution, the lateral movable plate 77 is fixed on the mounting frame 75, and the mounting frame 75 is installed on the base plate 78 through the slider 74 and the slide rail 73. The base plate 78 is installed in the frame 3. The transfer robot 23 clamps the workpiece 9 and places it on one side of the lateral movable plate 77. The thin cylinder 76 pushes the lateral movable plate 77 to clamp the workpiece 9. Wide finger cylinders 22 are set on both sides and installed on the base plate 78. Two air ports 71 are installed on the two clamping rods. The air pipe is connected to the air ports 71. After the workpiece 9 is clamped, the wide finger cylinders 22 drive the two air ports 71 to close the air ports on the workpiece 9 to carry out gas exchange and meet the detection conditions.

[0029] Specifically, optical sensors are installed at the ends of both the unloading conveyor belt 1 and the loading conveyor belt 4.

[0030] By adopting the above technical solution, it is convenient to monitor the position of the conveyed workpiece 9.

[0031] Specifically, one end of the vent 71 is connected to a vacuum pumping system.

[0032] By adopting the above technical solution, the stability of the air supply during the inspection of workpiece 9 is guaranteed.

[0033] The working principle and usage process of this utility model: When using this utility model... S1. Workpiece fixing and conveying: The workpiece fixing groove 8 inside the feeding conveyor belt 4 has a groove size that is perfectly matched with the shape of the workpiece 9. After the workpiece 9 is placed in, its lateral and longitudinal displacement during the conveying process can be restricted to avoid subsequent transfer robot 23 and transfer robot 1 24 from making mistakes due to vibration or displacement. The transfer robot 24 grips and positions the workpiece: A photoelectric sensor is installed at the end of the feeding conveyor belt 4. When the sensor detects that the workpiece 9 has reached the designated position, it sends a signal to the control system. The control system then instructs the transfer robot 24 to move. The wide-fin cylinder 232 at the end of the robot will preset the gripping force according to the size of the workpiece 9. After accurately gripping the workpiece 9, the motor screw module 234 and the screw module 22 work together to transfer the workpiece to the tooling fixture of the differential pressure test module 6. This ensures that the two cavity interfaces of the workpiece 9 are fully aligned with the sealing joint inside the differential pressure test module 6. This step is a preliminary screening to quickly determine whether there is obvious leakage in the workpiece 9, reducing the load of subsequent high-precision testing.

[0034] S2. Sealing and inflation: After the workpiece 9 is placed in the differential pressure test module 6, the cylinder of the tooling drives the sealing head to press down, sealing the two cavity interfaces of the workpiece 9 to the two independent air circuits of the test module respectively. The control system commands the inflation valve to open, and simultaneously fills the two cavities with dry compressed air or nitrogen at a preset pressure. During the inflation process, the pressure sensor monitors the pressure inside the cavity in real time. After the set value is reached, the inflation valve is closed. Pressure holding and differential pressure monitoring: During the pressure holding stage, the holding time is preset according to the volume of workpiece 9 to stabilize the pressure inside the cavity. After the pressure holding is completed, the high-precision differential pressure sensor starts to detect the pressure difference between the two cavities. If there is no leakage in either cavity of workpiece 9, the pressure in the two cavities is consistent and the differential pressure value is 0. If there is a leak in one cavity, its pressure will gradually decrease with the leakage, resulting in a pressure difference between the two cavities. The differential pressure sensor will collect this difference value in real time and transmit it to the control system. Initial inspection result determination: The control system compares the detected differential pressure value with the preset qualified threshold. If the differential pressure value is within the threshold, it is determined as "differential pressure test qualified" and waits to enter the next stage; if it exceeds the threshold, it is determined as "differential pressure test unqualified" and marked as unqualified product to be sorted. This stage performs high-precision leakage detection on the initially qualified workpieces and completes the separation of qualified and unqualified workpieces. S3. Transfer of Qualified Workpiece and Helium Mass Spectrometry Testing: The control system instructs the transfer robot 23 to move, pick up the workpiece 9 that has passed the differential pressure test, and transfer it to the vacuum chamber of the helium mass spectrometry detection module 7. After the vacuum chamber is closed, the built-in vacuum pump group starts to evacuate the vacuum, so that the vacuum level in the chamber reaches the background vacuum required for helium mass spectrometry leak detection. Subsequently, the helium filling system fills the dual chambers of workpiece 9 with helium at a preset pressure. If there is a tiny leak in workpiece 9, helium will permeate into the vacuum chamber through the leak. Leakage signal acquisition and precise detection: The ion source of the helium mass spectrometry detection module 7 ionizes the gas in the cavity. When the generated ions pass through the magnetic field analyzer, only helium ions with a mass-to-charge ratio of 4 are accurately separated and captured by the ion collector, forming an electrical signal. The control system converts the intensity of this electrical signal into the leakage rate unit: Pa・m³ / s, and compares it with the preset qualified leakage rate threshold. If it is lower than the threshold, it is judged as "finally qualified", otherwise it is judged as "finally unqualified".

[0035] S4. Workpiece sorting and conveying: After the inspection is completed, the vacuum chamber is depressurized, and the transfer robot 23 picks up the workpiece 9. If it is a qualified workpiece, the transfer robot 23 will transfer it to the unloading conveyor belt 1, which will then transport it to the next process. If it is a non-qualified workpiece, the transfer robot 23 will place it at the transfer station. Then, after the transfer robot 1 24 completes the differential pressure test of the previous cycle, it will pick up the non-qualified workpiece 9 and transfer it to the return conveyor belt 5, which will then transport it to the non-qualified product collection area.

[0036] Real-time monitoring and signal feedback: The feedback system includes multiple sensors, such as photoelectric sensors on the conveyor belt to monitor the workpiece position, pressure / vacuum sensors on the test module to monitor the test status, and position sensors on the robot to monitor motion accuracy. The sensors convert real-time data into electrical signals and continuously transmit them to the main control system.

[0037] Data processing and command output: After receiving feedback data, the control system compares it with the preset program parameters. If the data is normal, it continues to execute the next process command; if an abnormality occurs, such as the workpiece not being in place or the vacuum level not meeting the standard, it immediately issues an alarm signal, such as an audible and visual alarm, and simultaneously suspends equipment operation, displaying the fault cause on the operation interface, such as "Helium mass spectrometer vacuum chamber sealing abnormality," awaiting personnel to investigate.

[0038] Data Recording and Traceability: The control system also automatically records the detection data for each workpiece 9, including workpiece 9 number (if a barcode scanning function is available), differential pressure test value, helium mass spectrometry leakage rate, detection time, operator information, etc., and stores this data in the database. Users can query historical data through the user interface to achieve product quality traceability and statistical analysis of equipment operating efficiency.

[0039] Material unloading and completion processing: After the final qualified workpiece 9 is transferred to the unloading conveyor belt 1, the conveyor belt 1 transports it to the workpiece collection area at the end. If the equipment is equipped with an automatic barcode scanning function, it will scan the QR code or barcode of workpiece 9 before unloading, and complete the information binding after associating it with the detection data. When the last workpiece 9 leaves the unloading conveyor belt 1, the photoelectric sensor sends a "material unloading completed" signal to the control system. The control system records the total number of inspections, pass rate, and other data for this inspection operation, thus completing the entire airtightness inspection process.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-station differential pressure helium testing machine, comprising a frame (3), characterized in that: A helium mass spectrometry detection module (7) is provided on one side of the middle of the frame (3). A differential pressure testing module (6) is provided on one side of the helium mass spectrometry detection module (7). A workpiece transfer assembly (2) is installed at the upper end of the frame (3). A feeding support frame (11) is provided on one side of the frame (3). A material return conveyor belt (5) is installed at the upper end of the feeding support frame (11). A drive motor (10) is installed at the drive end of the material return conveyor belt (5). A feeding conveyor belt (4) is installed at the upper end of the material return conveyor belt (5). A workpiece fixing groove (8) is opened inside the feeding conveyor belt (4). A workpiece (9) is placed at the upper end of the feeding conveyor belt (4). A material discharge support frame (12) is provided on the side of the frame (3) away from the feeding support frame (11). A material discharge conveyor belt (1) is installed at the upper end of the material discharge support frame (12). A drive motor (13) is installed at the drive end of the material discharge conveyor belt (1).

2. The multi-station differential pressure helium testing machine according to claim 1, characterized in that: The workpiece transfer assembly (2) includes a lead screw module (22), which is installed through the upper part of the frame (3). A servo motor (21) is installed at the output end of the lead screw module (22). A second transfer robot (23) is installed on one side of the lead screw module (22), and a first transfer robot (24) is installed on one side of the second transfer robot (23).

3. The multi-station differential pressure helium testing machine according to claim 2, characterized in that: The transplanting robot (23) includes a guide device (235), which is installed on one side of the lead screw module (22). The guide device (235) is equipped with a motor lead screw module (234). A motion drag chain (233) is connected to one side of the motor lead screw module (234). A connecting joint (237) is provided at the bottom of the motor lead screw module (234). An mounting plate (236) is installed at the bottom of the connecting joint (237). Wide-type finger cylinders (232) are fixed on both sides of the bottom of the mounting plate (236). A finger clamp (231) is fixed at the output end of the wide-type finger cylinder (232).

4. The multi-station differential pressure helium testing machine according to claim 1, characterized in that: The helium mass spectrometry detection module (7) includes a base plate (78). The base plate (78) is fixed in the middle of the frame (3). Wide finger cylinders (72) are installed on both sides of the upper end of the base plate (78). A mounting bracket (75) is provided on one side of the wide finger cylinder (72). A slide rail (73) is installed at the bottom of the mounting bracket (75). A slider (74) is provided inside the slide rail (73). A thin cylinder (76) is provided on the side of the mounting bracket (75) away from the wide finger cylinder (72). A lateral movable plate (77) is fixed at the output end of the thin cylinder (76). A vent (71) is opened at the clamping rod of the output end of the wide finger cylinder (72).

5. The multi-station differential pressure helium testing machine according to claim 1, characterized in that: Optical sensors are installed at the ends of both the unloading conveyor belt (1) and the loading conveyor belt (4).

6. The multi-station differential pressure helium testing machine according to claim 4, characterized in that: A vacuum pumping system is connected to one end of the vent (71).

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