An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger

Abstract

The present invention relates to the technical field of fluid tightness detection, and specifically to an automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger, including a detection chamber and a hydraulic retarder heat exchanger body. Three working stations for detecting the hydraulic retarder heat exchanger body are provided inside the detection chamber. The device further includes a workpiece support plate for carrying the hydraulic retarder heat exchanger body, and a fixing component is arranged on the top thereof for fixing and sealing the hydraulic retarder heat exchanger body. A driving component is arranged inside the workpiece support plate for driving the fixing component to vibrate so as to improve the leak detection accuracy of the hydraulic retarder heat exchanger body. By simulating the external dynamic influences faced by the hydraulic retarder heat exchanger body during actual use through the driving component, tiny leakage points that may be caused by dynamic factors can be found, thereby improving the leak detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid sealing detection, and particularly to an automatic vacuum helium leak detection device for a heat exchanger of a hydraulic retarder. Background Art

[0002] A hydraulic retarder, commonly known as a "fluid retarder", is an important auxiliary braking device for vehicles. It converts the kinetic energy of the whole vehicle into heat energy and is taken away by the engine's circulating coolant, thereby improving vehicle driving safety, reducing the wear of the main brake, and extending the tire life. The working principle of the hydraulic retarder is based on components such as its internal working chamber, stator with blades, and rotor. Through the circulation and interaction of the oil, the conversion of kinetic energy is achieved. The heat exchanger is a key component in the hydraulic retarder, responsible for transferring the heat energy generated during the operation of the retarder to the coolant, and then dissipating it into the atmosphere through the engine's cooling system. The performance of the heat exchanger directly affects the heat dissipation effect and braking performance of the hydraulic retarder. Therefore, its quality and sealing performance are crucial. The vacuum helium leak detection technology is a high-precision and high-reliability leak detection technology, which is widely used in various industrial products with high sealing requirements. This technology determines the leak rate and leak location of the workpiece by filling helium gas into the workpiece to be inspected and then detecting the helium gas leaking from the workpiece in a vacuum environment using a helium mass spectrometer leak detector. With the development of the vehicle industry and the continuous progress of hydraulic retarder technology, the requirements for the quality and sealing performance of heat exchangers are getting higher and higher. Traditional leak detection methods, such as the gas pressure decay method and the water detection bubbling method, can no longer meet the leak detection requirements of the heat exchanger of the hydraulic retarder due to their low precision and poor stability. Therefore, more advanced leak detection means are needed to meet the high-precision and high-reliability leak detection requirements.

[0003] For example, in the patent document with the prior art publication number CN118857613A, this patent document discloses a static pressure airtightness testing machine for a heat exchanger used in a hydraulic retarder, including an electric push rod. The telescopic shaft of the electric push rod is fixedly provided with a connecting plate, so that the electric push rod drives the connecting plate to move vertically in the protective shell. The bottom of the connecting plate is fixedly provided with a connecting rod, and a replacement component is arranged at the bottom of the connecting rod. By setting a dry leak detector, it is convenient to perform static pressure airtightness testing on the heat exchanger used in the hydraulic retarder, with a relatively high degree of automation, improving the testing efficiency. Moreover, through the moving component, replacement component, clamping component, etc., it is convenient to automatically replace the connecting head connected to the heat exchanger, so as to facilitate the testing of heat exchangers of different specifications, further improving the testing efficiency without affecting the actual testing use, and can normally transport the liquids and gases used in the testing and ensure the sealing of the transportation.

[0004] Although existing technologies, such as dry leak detectors, etc., can effectively perform static pressure airtightness tests on the heat exchanger in the hydraulic retarder, ensuring its sealing performance in a static state, however, this testing method has limitations in practical applications. The hydraulic retarder and its heat exchanger will experience continuous vibration and dynamic stress during vehicle operation. This complex operating environment cannot be fully simulated by static pressure testing. Specifically, when the vehicle is in motion, the uneven road surface, engine vibration, and the vehicle's own dynamic response will cause the hydraulic retarder and its heat exchanger to experience multi-dimensional vibration and possible impacts. These dynamic factors may impose additional pressure on the sealing structure of the heat exchanger, thereby triggering potential leakage risks, which are often difficult to detect under static test conditions. Relying solely on static pressure airtightness testing to evaluate the sealing performance of the hydraulic retarder heat exchanger may not fully reveal its potential problems in the actual usage environment. Therefore, this application proposes an automated vacuum helium leak detection device for a hydraulic retarder heat exchanger. Summary of the Invention

[0005] The purpose of the present invention is to provide an automated vacuum helium leak detection device for a hydraulic retarder heat exchanger to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An automated vacuum helium leak detection device for a hydraulic retarder heat exchanger, including a detection chamber and a hydraulic retarder heat exchanger body, and three station chambers for detecting the hydraulic retarder heat exchanger body are provided inside the detection chamber. It also includes:

[0007] A workpiece support plate, which is used to carry the hydraulic retarder heat exchanger body, and a fixing component is provided on its top for fixing and sealing the hydraulic retarder heat exchanger body. A driving component is provided inside the workpiece support plate for driving the fixing component to vibrate to improve the leak detection accuracy of the hydraulic retarder heat exchanger body;

[0008] Three positioning frames are constructed and evenly installed inside the three station chambers. A flow splitter is provided on one side of the positioning frame, and an air injection component for introducing gas into the hydraulic retarder heat exchanger body for detection is provided on one side of the bottom of the flow splitter. A utilization component for recovering the used gas is provided on the other side of the flow splitter.

[0009] Preferably, the fixing component includes an auxiliary frame provided on the top of the workpiece support plate. Positioning plates are fixedly connected to both sides of the auxiliary frame. A screw rod is threadedly connected to the top of the auxiliary frame, and a pressing piece for pressing the hydraulic retarder heat exchanger body is fixedly connected to the bottom of the screw rod. A vent screw rod is threadedly connected to the top of the auxiliary frame, and a sealing piece adapted to the hydraulic retarder heat exchanger body to make it airtight is provided at the bottom of the vent screw rod.

[0010] Preferably, the driving assembly includes a motor fixedly connected inside the workpiece carrier plate. A circular groove is fixedly connected to the bottom of the auxiliary frame. The output end of the motor is fixedly connected to a straight plate, and the top of the straight plate is rotatably connected to a contact rod placed inside the circular groove. A plurality of inclined blocks are fixedly connected inside the circular groove. The auxiliary frame is connected to the workpiece carrier plate through an elastic pad to cause a small displacement of the auxiliary frame.

[0011] Preferably, the air injection assembly includes an extension plate fixedly connected to the flow dividing plate, and an air pump is fixedly connected to the top of the flow dividing plate. The air pump is internally connected to the extension plate through the flow dividing plate. A helium gas tank and a nitrogen gas tank are fixedly connected to the top of the detection chamber, and a mixing pipe for mixing gases is commonly connected between the helium gas tank and the nitrogen gas tank. The air pump is connected to the mixing pipe through an air delivery pipe. The bottom of the extension plate is connected to an air vent nozzle. The internal structure of the air vent screw is hollow and is connected to the hydraulic retarder heat exchanger body. An air delivery valve port adapted to the air vent nozzle is provided at the top of the air vent screw.

[0012] Preferably, the utilization assembly includes a straight cylinder fixedly connected to one side of the flow dividing plate. One end of the straight cylinder is connected to a recovery pipe that can be adapted to the air delivery valve port. An electromagnetic valve is fixedly connected inside the recovery pipe, and a filter cylinder is fixedly connected inside the straight cylinder.

[0013] Preferably, a high-frequency piezoelectric phased array system is fixedly connected to the bottom of the auxiliary frame, and the high-frequency piezoelectric phased array system is coupled to the bottom of the hydraulic retarder heat exchanger body.

[0014] Preferably, a vacuum pump is fixedly connected to the top of the detection chamber. The output end of the vacuum pump is connected to an air extraction pipe, and the bottom of the air extraction pipe penetrates through the extension plate and is connected to a connecting air pipe.

[0015] Preferably, a heating wire for heating the gas is fixedly connected inside the extension plate.

[0016] Preferably, it further includes a discharge conveyor belt for transporting the workpiece carrier plate. One end of the discharge conveyor belt is provided with a loading conveyor belt. One end of the loading conveyor belt is provided with a plurality of placement racks for temporarily placing the hydraulic retarder heat exchanger body. One side of the placement rack is provided with a predetermined rack for placing the hydraulic retarder heat exchanger body into the workpiece carrier plate for operation, and one side of the loading conveyor belt is provided with a feeding conveyor belt for transporting a plurality of hydraulic retarder heat exchanger bodies.

[0017] Preferably, an electric guide rail for transporting the workpiece carrier plate is arranged inside the detection chamber. Inside each of the three station chambers, a discharge conveyor belt for driving the movement of the workpiece carrier plate is arranged. A lifter is fixedly connected to the bottom of the electric guide rail, and a transfer belt for driving the workpiece carrier plate to move onto the discharge conveyor belt is arranged at the lifting end of the lifter.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. A motor drives the bar in circular motion. The contact rod, within its groove, continuously strikes the inclined block, pushing the auxiliary frame upward. The elastic pad stretches and rapidly vibrates, causing the hydraulic retarder heat exchanger body to vibrate. This design simulates the dynamic external influences that the hydraulic retarder heat exchanger body faces in actual use, enabling it to detect even small leaks caused by these dynamic factors, thereby improving leak detection accuracy. The high-frequency piezoelectric phased array system releases ultrasonic waves that penetrate the hydraulic retarder heat exchanger body, accelerating the flow of helium gas within it. The rapid flow of helium, the detection medium, more quickly brings helium gas from the leak to the detection area, enabling the detection equipment to more accurately and promptly detect leaks, further improving leak detection accuracy. The ultrasonic waves released by the high-frequency piezoelectric phased array system act on the interior of the hydraulic retarder heat exchanger body, accelerating the dispersion of the internal gas. This means that during the detection process, the helium gas is more evenly distributed within the heat exchanger, reducing blind spots caused by uneven gas distribution and making the detection process more efficient.

[0020] 2. The gas injection assembly allows helium to be precisely injected into the interior of the hydraulic retarder heat exchanger. The air pump draws mixed gas from the helium tank and nitrogen tank through the gas pipe. The mixed gas then passes through the manifold, extension plate, and vent nozzle. After the vent nozzle is inserted into the gas valve port at the top of the vent screw, the gas is introduced into the interior of the hydraulic retarder heat exchanger. This design ensures the accuracy and reliability of gas injection and provides a stable gas environment for subsequent leak detection. The helium is heated by the heating wire to an appropriate amount, which increases its activity and flow rate. This helps the helium fill the interior of the hydraulic retarder heat exchanger more quickly, speeding up the detection process. A comprehensive test can be completed in a shorter time, improving detection efficiency. The helium tank and nitrogen tank are connected by a mixing pipe, which allows the helium and nitrogen mixing ratio to be flexibly adjusted according to actual needs. Different gas mixtures may provide better detection results in certain specific testing scenarios. This flexibility enables the equipment to adapt to a variety of testing requirements, improving its versatility and applicability. The recovery tube in the assembly can be adapted to the gas valve port, directing used helium into the straight cylinder for initial filtration through the filter cartridge before collection. This design effectively recovers helium, alleviates the shortage of helium resources, and reduces testing costs. It also meets environmental requirements and reduces resource waste. The recovered helium can be reused after processing and used again for leak detection in the hydraulic retarder heat exchanger. This not only improves helium utilization but also ensures a stable gas supply during the testing process, helping to maintain the continuity and stability of the testing work.

[0021] 3. The coordinated operation of the feeding conveyor belt, the loading conveyor belt, the discharging conveyor belt, the electric guide rail, the discharging conveyor belt, the elevator, and the material transfer belt realizes the full-process automated transfer of the hydraulic retarder heat exchanger body from feeding, loading, inspection to discharging. It reduces manual handling and operation links, lowers labor intensity, and improves production efficiency. The conveyor belts cooperate with each other and can flexibly transfer the workpiece pallet and the hydraulic retarder heat exchanger body according to the requirements of the inspection process. For example, the feeding conveyor belt transports the body to the loading conveyor belt, and the loading conveyor belt then transfers it to the placement rack. Finally, the body is placed on the workpiece pallet manually or mechanically. The whole process is smooth and efficient, ensuring the smooth connection between different links of the material. Through the cooperation of the electric guide rail, the elevator, and the material transfer belt, the workpiece pallet can be lifted and transported to the idle workstation for inspection. This design enables the full utilization of the three workstations, avoids workstation idleness, and further improves the efficiency of automated inspection. The setting of the placement rack and the reservation rack provides an operating space for the staff, facilitating them to accurately place the hydraulic retarder heat exchanger body on the workpiece pallet and perform the fixing operation. This helps improve the accuracy and stability of the operation and reduces the detection errors caused by improper manual operation. The discharging conveyor belt and the discharging conveyor belt are mutually adapted, and the precise cooperation between the material transfer belt and the elevator can ensure the accurate positioning and transportation of the workpiece pallet between different conveying links. This helps ensure the smooth progress of the inspection process and avoid affecting the inspection results due to position deviation. Description of the Drawings

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the inspection room and the reservation rack in the present invention;

[0024] Figure 3 It is a structural schematic diagram of the inspection room in the present invention;

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

[0026] Figure 5 It is a structural schematic diagram of the electric guide rail in the present invention;

[0027] Figure 6 It is a structural schematic diagram of the workpiece pallet and the positioning rack in the present invention;

[0028] Figure 7 It is a structural schematic diagram of the workpiece pallet in the present invention;

[0029] Figure 8 It is an exploded structural schematic diagram of the workpiece pallet and the hydraulic retarder heat exchanger body in the present invention;

[0030] Figure 9 Schematic cross-sectional structure diagram of the workpiece pallet in the present invention;

[0031] Figure 10 Schematic structure diagram of the circular groove in the present invention;

[0032] Figure 11 Schematic cross-sectional structure diagram of the straight cylinder in the present invention;

[0033] Figure 12 Schematic cross-sectional structure diagram of the flow splitter plate in the present invention.

[0034] In the figure: 100, detection chamber; 101, vacuum pump; 102, nitrogen gas tank; 103, helium gas tank; 104, maintenance ladder; 105, guardrail; 106, heat exchanger body of hydraulic retarder; 200, workpiece pallet; 201, auxiliary frame; 202, positioning plate; 203, elastic pad; 204, pressing piece; 205, screw; 206, sealing piece; 207, ventilation screw; 208, high-frequency piezoelectric phased array system; 209, gas transmission valve port; 210, motor; 211, circular groove; 212, straight plate; 213, contact rod; 214, inclined block; 300, positioning frame; 301, air pump; 302, flow splitter plate; 303, extension plate; 304, straight cylinder; 305, recovery pipe; 306, solenoid valve; 307, filter cartridge; 308, gas transmission pipe; 309, extraction pipe; 310, connecting gas pipe; 311, ventilation nozzle; 312, heating wire; 313, mass spectrometer probe; 314, working station chamber; 400, discharge conveyor belt; 401, feed conveyor belt; 402, loading conveyor belt; 403, placement rack; 404, reservation rack; 405, electric guide rail; 406, material transfer belt; 407, lifter; 408, discharging conveyor belt. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Embodiment 1: Please refer to Figure 1 , Figure 4 and Figure 6, the present invention provides a technical solution: an automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger, including a detection chamber 100 and a hydraulic retarder heat exchanger body 106. Three working stations 314 for detecting the hydraulic retarder heat exchanger body 106 are provided inside the detection chamber 100. By setting the three working stations 314, the waiting time for detecting the hydraulic retarder heat exchanger body 106 can be reduced, and the detection can be carried out in a staggered form, thereby improving the detection efficiency. A maintenance ladder 104 is fixedly connected to one side of the detection chamber 100, and a guardrail 105 is fixedly connected to one end of the detection chamber 100.

[0037] Please refer to Figure 6 , Figure 7 and Figure 8 , and further includes a workpiece support plate 200, which is used to carry the hydraulic retarder heat exchanger body 106, and a fixing component is provided on its top for fixing and sealing the hydraulic retarder heat exchanger body 106. A driving component is provided inside the workpiece support plate 200 for driving the fixing component to vibrate to improve the leak detection accuracy of the hydraulic retarder heat exchanger body 106. The fixing component includes an auxiliary frame 201 provided on the top of the workpiece support plate 200. Positioning plates 202 are fixedly connected to both sides of the auxiliary frame 201. A screw rod 205 is threadedly connected to the top of the auxiliary frame 201, and a pressing piece 204 for pressing the hydraulic retarder heat exchanger body 106 is fixedly connected to the bottom of the screw rod 205. A vent screw rod 207 is threadedly connected to the top of the auxiliary frame 201, and a sealing piece 206 adapted to the hydraulic retarder heat exchanger body 106 to make it airtight is provided at the bottom of the vent screw rod 207. The fixing component can effectively fix the hydraulic retarder heat exchanger body 106 and block the pipeline at the top of the hydraulic retarder heat exchanger body 106 at the same time. A screwdriver can be used to drive the screw rod 205 and the vent screw rod 207 to rotate respectively to drive the pressing piece 204 and the sealing piece 206 downward, so as to realize the fixing and sealing of the hydraulic retarder heat exchanger body 106. The setting of the positioning plate 202 can effectively limit the horizontal displacement of the hydraulic retarder heat exchanger body 106 and improve the accuracy of workpiece positioning.

[0038] Please refer to Figure 8 , Figure 9and the image detection chamber 100. Further, the driving component includes a motor 210 fixedly connected inside the workpiece support plate 200. A circular groove 211 is fixedly connected to the bottom of the auxiliary frame 201. The output end of the motor 210 is fixedly connected with a straight plate 212, and the top of the straight plate 212 is rotatably connected with a contact rod 213 placed inside the circular groove 211. A plurality of inclined blocks 214 are fixedly connected inside the circular groove 211. The auxiliary frame 201 is connected to the workpiece support plate 200 through an elastic pad 203 to cause a small displacement of the auxiliary frame 201. A high-frequency piezoelectric phased array system 208 is fixedly connected to the bottom of the auxiliary frame 201, and the high-frequency piezoelectric phased array system 208 is coupled to the bottom of the hydraulic retarder heat exchanger body 106. The cooperation of the contact rod 213 and the inclined block 214 can drive the inclined block 214 to move upward when the straight plate 212 makes a circular motion, and then apply an upward force to the auxiliary frame 201 and release it after the contact rod 213 passes over the inclined block 214, so as to obtain mechanical kinetic energy and the elastic pad 203 is quickly stressed and vibrates, driving the hydraulic retarder heat exchanger body 106 to vibrate, so as to simulate the external dynamic influence faced by the hydraulic retarder heat exchanger body 106 in actual use. The ultrasonic wave released by the high-frequency piezoelectric phased array system 208 penetrates the hydraulic retarder heat exchanger body 106 and can accelerate the helium gas flow inside the hydraulic retarder heat exchanger body 106. Improving its flow efficiency can improve the detection efficiency. The mutual cooperation of the two can effectively improve the detection accuracy.

[0039] Specifically, turn on the high-frequency piezoelectric phased array system 208 to generate ultrasonic waves into the hydraulic retarder heat exchanger body 106 to accelerate the gas dispersion efficiency inside it. Turn on the motor 210 to drive the straight plate 212 to make a circular motion. At this time, the contact rod 213 is placed inside the circular groove 211 and continuously contacts the inclined block 214 to push the auxiliary frame 201 upward, causing the elastic pad 203 to stretch and vibrate, and making the hydraulic retarder heat exchanger body 106 vibrate.

[0040] In summary, the motor 210 drives the straight plate 212 to perform circular motion. The contact rod 213 continuously contacts the inclined block 214 in the circular groove 211, pushing the auxiliary frame 201 upward. After being stretched, the elastic pad 203 vibrates rapidly, causing the hydraulic retarder heat exchanger body 106 to vibrate. This design simulates the external dynamic influences faced by the hydraulic retarder heat exchanger body 106 during actual use, enabling the discovery of tiny leakage points that may be caused by dynamic factors, thereby improving the accuracy of leak detection. The high-frequency piezoelectric phased array system 208 emits ultrasonic waves that penetrate the hydraulic retarder heat exchanger body 106, accelerating the circulation of helium gas inside it. As the detection medium, the rapid flow of helium gas can more quickly bring the helium gas at the leakage point to the detection area, enabling the detection equipment to capture the leakage signal more timely and accurately, thereby improving the accuracy of leak detection. The ultrasonic waves emitted by the high-frequency piezoelectric phased array system 208 act on the inside of the hydraulic retarder heat exchanger body 106, accelerating the dispersion efficiency of the internal gas. This means that during the detection process, helium gas can be more evenly distributed inside the heat exchanger, reducing the detection blind spots caused by uneven gas distribution, making the detection process more efficient and capable of completing a comprehensive detection in a shorter time. There are three workstation chambers 314 inside the detection chamber 100, and the hydraulic retarder heat exchanger body 106 can be detected in the three workstation chambers 314 in a staggered form. This design greatly reduces the waiting time for detecting the hydraulic retarder heat exchanger body 106, realizes multi-station parallel detection, and thus significantly improves the overall detection efficiency. For the screw 205 and the pressing piece 204 in the fixing component, the screw 205 is driven to rotate by a screwdriver, driving the pressing piece 204 to move downward, which can effectively fix the hydraulic retarder heat exchanger body 106. The setting of the positioning plate 202 further restricts the horizontal misalignment of the hydraulic retarder heat exchanger body 106, improving the accuracy of workpiece positioning, ensuring the stable position of the workpiece during the detection process, and avoiding affecting the detection results due to workpiece shaking. The design of the ventilation screw 207 and the sealing piece 206 drives the ventilation screw 207 to rotate by a screwdriver, driving the sealing piece 206 to move downward, which can block the pipeline at the top of the hydraulic retarder heat exchanger body 106. The reliable seal ensures that helium gas does not leak from the pipeline during the detection process, ensuring the stability and accuracy of the detection environment and providing guarantee for accurate leak detection.

[0041] Please refer to Figure 6 、 Figure 11 and Figure 12, further comprising a positioning frame 300, which is configured in three and evenly installed inside the three working stations 314. A flow dividing plate 302 is arranged on one side of the positioning frame 300, and an air injection component for introducing gas into the hydraulic retarder heat exchanger body 106 for detection is arranged on one side of the bottom of the flow dividing plate 302. A utilization component for recovering the used gas is arranged on the other side of the flow dividing plate 302. By setting the air injection component, helium can be effectively filled into the internal of the ventilation screw 207 and enter the internal of the hydraulic retarder heat exchanger body 106, so that helium can be obtained under vacuum conditions. By setting the utilization component, helium can be recovered for reprocessing and reused, alleviating the shortage of helium resources.

[0042] Furthermore, the air injection component includes an extension plate 303 fixedly connected to the flow dividing plate 302, and an air pump 301 is fixedly connected to the top of the flow dividing plate 302. The air pump 301 is internally connected to the extension plate 303 through the flow dividing plate 302. A helium gas tank 103 and a nitrogen gas tank 102 are fixedly connected to the top of the detection chamber 100, and a mixing pipe for mixing gases is commonly connected between the helium gas tank 103 and the nitrogen gas tank 102. The air pump 301 is connected to the mixing pipe through an air delivery pipe 308. The bottom of the extension plate 303 is connected to an air vent nozzle 311. The internal structure of the ventilation screw 207 is hollow and is connected to the hydraulic retarder heat exchanger body 106. An air delivery valve port 209 adapted to the air vent nozzle 311 is opened at the top of the ventilation screw 207. A separate air path is formed and connected between the extension plate 303, the flow dividing plate 302, and the output end of the air pump 301. Among them, the air delivery valve port 209 is a closed port, and it is in a closed state when the air vent nozzle 311 is not inserted into the internal of the air delivery valve port 209. When the air vent nozzle 311 is inserted into the internal of the air delivery valve port 209, the two are connected to supply helium to be introduced into the internal of the hydraulic retarder heat exchanger body 106, realizing the air injection work.

[0043] Among them, the utilization component includes a straight cylinder 304 fixedly connected to one side of the flow dividing plate 302. One end of the straight cylinder 304 is connected to a recovery pipe 305 that can be adapted to the air delivery valve port 209. An electromagnetic valve 306 is fixedly connected to the internal of the recovery pipe 305. A filter cylinder 307 is fixedly connected to the internal of the straight cylinder 304. The recovery pipe 305 is also set to be adapted to the air delivery valve port 209, and it can introduce the used helium into the internal of the straight cylinder 304 for preliminary filtration by the filter cylinder 307 and then collect it, improving the utilization rate.

[0044] A vacuum pump 101 is fixedly connected to the top of the detection chamber 100, and the output end of the vacuum pump 101 is connected to an exhaust pipe 309. The bottom of the exhaust pipe 309 passes through the extension plate 303 and is connected to a connecting pipe 310. The connecting pipe 310 can be connected to the gas supply valve port 209 to evacuate the hydraulic retarder heat exchanger body 106 before gas injection. A heating wire 312 for heating the gas is fixedly connected to the inside of the extension plate 303. The heating wire 312 can heat the helium to an appropriate amount to increase its activity and increase the flow rate.

[0045] Specifically, the air connection pipe 310 is operated to connect with the air supply valve port 209 to evacuate the sealing plate 206. Then, the extension plate 303 is operated to move downward so that the vent nozzle 311 enters and connects with the air supply valve port 209 inside the vent screw 207. Then, the air pump 301 is operated to draw a mixture of nitrogen and helium from the helium tank 103 and the maintenance ladder 104 through the air supply pipe 308 and inject it into the interior of the hydraulic retarder heat exchanger body 106. The mass spectrometer probe 313 can be attached to the surface of the hydraulic retarder heat exchanger body 106 to scan the weld at a slow speed to detect its sealing.

[0046] In summary, the configuration of the gas injection assembly enables helium to be accurately injected into the interior of the hydraulic retarder heat exchanger body 106. The air pump 301 draws mixed gas from the helium tank 103 and the nitrogen tank 102 through the gas pipe 308. The mixed gas then passes through the diverter plate 302, the extension plate 303, and the vent nozzle 311. After the vent nozzle 311 is inserted into the gas valve port 209 at the top of the vent screw 207, the gas is introduced into the interior of the hydraulic retarder heat exchanger body 106. This design ensures the accuracy and reliability of gas injection, provides a stable gas environment for subsequent leak detection work, and appropriately heats the helium through the heating wire 312, thereby increasing the activity of the helium and accelerating its flow rate. This helps helium fill the interior of the hydraulic retarder heat exchanger body 106 more quickly, accelerating the detection process, enabling comprehensive testing to be completed in a shorter time, and improving detection efficiency. The helium tank 103 and the nitrogen tank 102 are connected to a mixing pipe, which can flexibly adjust the mixing ratio of helium and nitrogen according to actual needs. Different mixed gases may have better detection results in certain specific detection scenarios. This flexibility enables the device to adapt to various detection requirements, improving the versatility and applicability of the device. The recovery pipe 305 in the assembly can be adapted to the gas valve port 209 to guide the used helium into the straight cylinder 304 and collect it after preliminary filtration by the filter cylinder 307. This design effectively recovers helium, alleviates the shortage of helium resources, reduces detection costs, and also meets environmental protection requirements and reduces resource waste. The recovered helium can be reused after processing and used again for leak detection of the hydraulic retarder heat exchanger. This not only improves the utilization rate of helium, but also ensures a stable supply of gas during the detection process, helping to maintain the continuity and stability of the detection work.

[0047] Embodiment 2: Please refer to Figure 1 , Figure 2 and Figure 3 , the present invention also provides a technical solution, which is different from the technical solution of Embodiment 1: An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger further includes a discharge conveyor belt 400 for transporting the workpiece pallet 200, and one end of the discharge conveyor belt 400 is provided with a loading conveyor belt 402. One end of the loading conveyor belt 402 is provided with a plurality of placement racks 403 for temporarily placing the hydraulic retarder heat exchanger body 106. One side of the placement rack 403 is provided with a predetermined rack 404 for placing the hydraulic retarder heat exchanger body 106 into the workpiece pallet 200 for operation. And one side of the loading conveyor belt 402 is provided with a feeding conveyor belt 401 for transporting a plurality of hydraulic retarder heat exchanger bodies 106. The mutual cooperation among the discharge conveyor belt 400, the feeding conveyor belt 401 and the loading conveyor belt 402 realizes flexible transportation, thereby improving the efficiency of automatic detection. At the same time, the placement rack 403 and the predetermined rack 404 are provided for the staff to operate to fix the hydraulic retarder heat exchanger body 106 inside the workpiece pallet 200 to complete subsequent detection.

[0048] Please refer to Figure 3 , Figure 4 and Figure 5 , further, an electric guide rail 405 for transporting the workpiece pallet 200 is arranged inside the detection chamber 100. A discharge conveyor belt 408 for driving the movement of the workpiece pallet 200 is arranged inside each of the three station chambers 314. The bottom of the electric guide rail 405 is fixedly connected with a lifter 407, and a transfer belt 406 for driving the workpiece pallet 200 to move onto the discharge conveyor belt 408 is arranged at the lifting end of the lifter 407. By setting the cooperation of the transfer belt 406 and the lifter 407, the workpiece pallet 200 can be lifted and transported to an idle station chamber 314 for detection at a suitable position, further improving the automatic detection process, and the discharge conveyor belt 408 and the discharge conveyor belt 400 are mutually adapted to realize the transfer and classification after detection.

[0049] Specifically, first, a plurality of hydrodynamic retarder heat exchanger bodies 106 are sequentially placed neatly above the feeding conveyor belt 401. The feeding conveyor belt 401 is started, so that the plurality of hydrodynamic retarder heat exchanger bodies 106 are transported to the loading conveyor belt 402 and then transferred to the placement rack 403. An operator manually places the hydrodynamic retarder heat exchanger body 106 on the top of the workpiece pallet 200. Subsequently, the driving screw 205 and the ventilation screw 207 are rotated to fix the hydrodynamic retarder heat exchanger body 106. Both ends of the top of the auxiliary frame 201 can be pulled to allow the hydrodynamic retarder heat exchanger body 106 to be placed inside. Thereafter, the workpiece pallet 200 is placed on the top of the electric guide rail 405 and transported into the interior of the inspection chamber 100. When facing the three station chambers 314, the idle station chambers 314 are sequentially rotated into position. By starting the lifter 407 to push the transfer belt 406 upward to abut against the workpiece pallet 200 to lift it off the electric guide rail 405, it is thus conveyed into the discharge conveyor belt 408, and then the workpiece pallet 200 is conveyed into the interior of the station chamber 314 for positioning.

[0050] In summary, the coordinated operation of the feeding conveyor belt 401, the loading conveyor belt 402, the discharge conveyor belt 400, the electric guide rail 405, the discharge conveyor belt 408, the lifter 407, and the transfer belt 406 realizes the full-process automatic transfer of the hydrodynamic retarder heat exchanger body 106 from feeding, loading, inspection to discharging. It reduces manual handling and operation links, lowers the labor intensity, and improves the production efficiency. The conveyor belts cooperate with each other and can flexibly transfer the workpiece pallet 200 and the hydrodynamic retarder heat exchanger body 106 according to the requirements of the inspection process. For example, the feeding conveyor belt 401 conveys the body to the loading conveyor belt 402, the loading conveyor belt 402 then transfers it to the placement rack 403, and finally the body is placed on the workpiece pallet 200 manually or mechanically. The whole process is smooth and efficient, ensuring the smooth connection between different links of the material. Through the cooperation of the electric guide rail 405, the lifter 407, and the transfer belt 406, the workpiece pallet 200 can be lifted and conveyed into the idle station chamber 314 for inspection. This design enables the three station chambers 314 to be fully utilized, avoiding idle stations and further improving the efficiency of automatic inspection. The setting of the placement rack 403 and the predetermined rack 404 provides an operating space for the staff, facilitating them to accurately place the hydrodynamic retarder heat exchanger body 106 on the workpiece pallet 200 and perform the fixing operation. This helps to improve the accuracy and stability of the operation and reduce the detection errors caused by improper manual operation. The discharge conveyor belt 408 and the discharge conveyor belt 400 are mutually adapted, and the precise cooperation between the transfer belt 406 and the lifter 407 can ensure the accurate positioning and conveyance of the workpiece pallet 200 between different conveying links. This helps to ensure the smooth progress of the inspection process and avoid affecting the inspection results due to position deviation.

[0051] Working principle: First, multiple hydraulic retarder heat exchanger bodies 106 are placed in sequence above the feed conveyor belt 401 and arranged neatly. The feed conveyor belt 401 is turned on to allow multiple hydraulic retarder heat exchanger bodies 106 to be transported to the loading conveyor belt 402 and then transferred to the placement rack 403. The hydraulic retarder heat exchanger bodies 106 are manually placed on the top of the workpiece support plate 200. Then, the screw rod 205 and the ventilation screw rod 207 are driven to rotate to fix the hydraulic retarder heat exchanger bodies 106. The two ends of the top of the auxiliary rack 201 can pull the hydraulic retarder heat exchanger bodies 106 to be placed inside it.

[0052] Then, the workpiece pallet 200 is placed on the top of the electric guide rail 405 and transported into the interior of the inspection room 100. When facing the three workstation rooms 314, the idle workstation rooms 314 are rotated in turn to rotate into the inspection room 100. The lifting device 407 is opened to push the conveyor belt 406 upward to contact the workpiece pallet 200, so that it is lifted and separated from the electric guide rail 405 and transported to the discharge conveyor belt 408. The workpiece pallet 200 is then transported to the interior of the workstation room 314 and positioned.

[0053] At this time, the workpiece support plate 200 is placed directly below the positioning frame 300, and the air connection pipe 310 is operated to connect with the air valve port 209 to evacuate the sealing plate 206. Then, the extension plate 303 is operated to move downward so that the vent nozzle 311 enters the air valve port 209 inside the vent screw 207 and connects. Then, the air pump 301 is operated to draw a mixed gas of nitrogen and helium from the helium tank 103 and the maintenance ladder 104 through the air pipe 308 and inject it into the interior of the hydraulic retarder heat exchanger body 106. The mass spectrometer probe 313 can fit the hydraulic retarder. The surface of the retarder heat exchanger body 106 is scanned slowly for weld tightness. Simultaneously, the high-frequency piezoelectric phased array system 208 is activated to generate ultrasonic waves into the interior of the hydraulic retarder heat exchanger body 106, thereby accelerating the internal gas dispersion efficiency. The motor 210 is activated to drive the straight plate 212 to perform circular motion. At this time, the abutment rod 213 is placed inside the circular groove 211 and continuously abuts the inclined block 214, thereby pushing the auxiliary frame 201 upward, causing the elastic pad 203 to stretch and vibrate, thereby causing the hydraulic retarder heat exchanger body 106 to vibrate.

[0054] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger, comprising a detection chamber (100) and a hydraulic retarder heat exchanger body (106), and three station chambers (314) for detecting the hydraulic retarder heat exchanger body (106) are arranged inside the detection chamber (100), characterized in that, Further included are: A workpiece pallet (200) for carrying the hydrodynamic retarder heat exchanger body (106), and a fixing component is provided at the top thereof for fixing and sealing the hydrodynamic retarder heat exchanger body (106). A driving component is provided inside the workpiece pallet (200) for driving the fixing component to vibrate so as to improve the leak detection accuracy of the hydrodynamic retarder heat exchanger body (106); Three positioning frames (300) which are evenly installed inside three working stations (314). A flow dividing plate (302) is provided on one side of the positioning frame (300), and an air injection component for introducing gas into the hydrodynamic retarder heat exchanger body (106) for detection is provided at one side of the bottom of the flow dividing plate (302). A utilization component for recovering the used gas is provided on the other side of the flow dividing plate (302); The air injection component includes an extension plate (303) fixedly connected to the flow dividing plate (302), and an air pump (301) is fixedly connected to the top of the flow dividing plate (302). The air pump (301) is internally connected to the extension plate (303) through the flow dividing plate (302). A helium gas tank (103) and a nitrogen gas tank (102) are fixedly connected to the top of the detection chamber (100), and a mixing pipe for mixing gases is commonly connected between the helium gas tank (103) and the nitrogen gas tank (102). The air pump (301) is connected to the mixing pipe through an air delivery pipe (308). The bottom of the extension plate (303) is connected to an air vent nozzle (311); The fixing component includes an auxiliary frame (201) provided on the top of the workpiece pallet (200). Positioning plates (202) are fixedly connected to both sides of the auxiliary frame (201). A screw rod (205) is threadedly connected to the top of the auxiliary frame (201), and a pressing piece (204) for pressing the hydrodynamic retarder heat exchanger body (106) is fixedly connected to the bottom of the screw rod (205). A vent screw rod (207) is threadedly connected to the top of the auxiliary frame (201), and a sealing piece (206) adapted to the hydrodynamic retarder heat exchanger body (106) for sealing is provided at the bottom of the vent screw rod (207). The inside of the vent screw rod (207) is hollow and is connected to the hydrodynamic retarder heat exchanger body (106).

2. The automatic equipment for vacuum helium leak detection of the hydraulic retarder heat exchanger according to claim 1, characterized in that: The driving component includes a motor (210) fixedly connected to the inside of the workpiece pallet (200). A circular groove (211) is fixedly connected to the bottom of the auxiliary frame (201). A straight plate (212) is fixedly connected to the output end of the motor (210), and a resisting rod (213) placed inside the circular groove (211) is rotatably connected to the top of the straight plate (212). A plurality of inclined blocks (214) are fixedly connected to the inside of the circular groove (211). The auxiliary frame (201) is connected to the workpiece pallet (200) through an elastic pad (203) to cause a small displacement of the auxiliary frame (201).

3. An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger according to claim 1, characterized in that: An air transmission valve port (209) adapted to the air vent nozzle (311) is provided at the top of the vent screw rod (207).

4. An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger according to claim 3, characterized in that: The utilization component includes a straight cylinder (304) fixedly connected to one side of the flow splitter plate (302). One end of the straight cylinder (304) is communicated with a recovery pipe (305) that can be adapted to the gas transmission valve port (209). An electromagnetic valve (306) is fixedly connected inside the recovery pipe (305), and a filter cylinder (307) is fixedly connected inside the straight cylinder (304).

5. An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger according to claim 2, characterized in that: The bottom of the auxiliary frame (201) is fixedly connected with a high-frequency piezoelectric phased array system (208), and the high-frequency piezoelectric phased array system (208) is coupled to the bottom of the hydrodynamic retarder heat exchanger body (106).

6. An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger according to claim 3, characterized in that: A vacuum pump (101) is fixedly connected to the top of the detection chamber (100). The output end of the vacuum pump (101) is communicated with an air extraction pipe (309). The bottom of the air extraction pipe (309) penetrates through the extension plate (303) and is connected with a connecting air pipe (310).

7. An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger according to claim 3, characterized in that: A heating wire (312) for heating gas is fixedly connected inside the extension plate (303).

8. An automated device for vacuum helium leak detection of a hydraulic retarder heat exchanger according to claim 1, characterized in that: It further includes a discharge conveyor belt (400) for transporting the workpiece pallet (200). One end of the discharge conveyor belt (400) is provided with a loading conveyor belt (402). One end of the loading conveyor belt (402) is provided with a plurality of placement racks (403) for temporarily placing the hydrodynamic retarder heat exchanger body (106). One side of the placement rack (403) is provided with a predetermined rack (404) for placing the hydrodynamic retarder heat exchanger body (106) into the workpiece pallet (200) for operation. One side of the loading conveyor belt (402) is provided with a feeding conveyor belt (401) for transporting a plurality of hydrodynamic retarder heat exchanger bodies (106).

9. An automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger according to claim 7, characterized in that: An electric guide rail (405) for transporting the workpiece pallet (200) is arranged inside the detection chamber (100). A discharge conveyor belt (408) for driving the movement of the workpiece pallet (200) is arranged inside each of the three working stations (314). A lifter (407) is fixedly connected to the bottom of the electric guide rail (405), and a transfer belt (406) for driving the movement of the workpiece pallet (200) onto the discharge conveyor belt (408) is arranged at the lifting end of the lifter (407).

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