Vacuum helium leak detection automation equipment for hydraulic retarder heat exchanger

Abstract

The invention relates to the technical field of fluid sealing performance detection, in particular to vacuum helium leakage detection automation equipment for a hydraulic retarder heat exchanger, which comprises a detection chamber, a hydraulic retarder heat exchanger body, a workpiece supporting plate, a vacuum helium leakage detection device, a vacuum helium leakage detection device, a vacuum helium leakage detection device and a vacuum helium leakage detection device, and is characterized in that the detection chamber is internally provided with three station chambers for detecting the hydraulic retarder heat exchanger body; the workpiece supporting plate is used for bearing a hydraulic retarder heat exchanger body, a fixing assembly is arranged at the top of the workpiece supporting plate and used for fixing and sealing the hydraulic retarder heat exchanger body, and a driving assembly is arranged in the workpiece supporting plate and used for driving the fixing assembly to shake so as to improve the leak detection accuracy of the hydraulic retarder heat exchanger body. The external dynamic influence of the hydraulic retarder heat exchanger body in actual use is simulated through the driving assembly, and tiny leakage points possibly caused by dynamic factors can be found, so that the leak detection accuracy is improved.

Description

Technical Field

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

[0002] A hydrodynamic 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 carried away by the engine's circulating coolant, thereby improving vehicle driving safety, reducing wear of the main brake, and extending the life of tires. The working principle of a hydrodynamic 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 hydrodynamic 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 hydrodynamic retarder. Therefore, its quality and tightness are crucial. Vacuum helium leak detection technology is a high-precision and highly reliable leak detection technology, which is widely used in various industrial products with high tightness requirements. This technology fills helium gas into the workpiece to be inspected, and then uses a helium mass spectrometer leak detector to detect the helium gas leaking from the workpiece in a vacuum environment, so as to determine the leak rate and leak location of the workpiece. With the development of the vehicle industry and the continuous progress of hydrodynamic retarder technology, the requirements for the quality and tightness of heat exchangers are also 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 heat exchangers for hydrodynamic retarders due to their low precision and poor stability. Therefore, more advanced leak detection means are needed to meet the high-precision and highly reliable 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 hydrodynamic 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 hydrodynamic retarder. The degree of automation is relatively high, which improves the testing efficiency. Moreover, through the moving component, replacement component, clamping component, etc., it is convenient to automatically replace the connector connected to the heat exchanger, so as to facilitate the testing of heat exchangers of different specifications. While further improving the testing efficiency, it does not affect the actual testing use, and can normally transport the liquids and gases used in the testing, and ensure the tightness of the transportation.

[0004] Although existing technologies, such as dry leak detectors, can effectively perform static pressure airtightness tests on the heat exchanger in the hydraulic retarder, ensuring its sealing performance in a static state, 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. Such a complex operating environment cannot be fully simulated by static pressure testing. Specifically, when the vehicle is in motion, the unevenness of the road surface, the vibration of the engine, 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 use 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 working stations for detecting the hydraulic retarder heat exchanger body are opened inside the detection chamber. It also includes: A workpiece support plate, which is used to carry the hydraulic retarder heat exchanger body, and a fixing component is arranged on its top 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 to improve the leak detection accuracy of the hydraulic retarder heat exchanger body; Three positioning frames are uniformly installed inside the three working stations. A flow dividing plate is arranged 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 arranged on one side of the bottom of the flow dividing plate. A recycling component for recycling the used gas is arranged on the other side of the flow dividing plate.

[0007] Preferably, the fixing component includes an auxiliary frame arranged 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 for sealing is arranged at the bottom of the vent screw rod.

[0008] 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.

[0009] Preferably, the gas injection assembly includes an extension plate fixedly connected to the flow dividing plate. A gas pump is fixedly connected to the top of the flow dividing plate. The gas 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. A mixing pipe for mixing gases is commonly connected between the helium gas tank and the nitrogen gas tank. The gas 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 ventilation 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 ventilation screw.

[0010] 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. A filter cylinder is fixedly connected inside the straight cylinder.

[0011] 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.

[0012] 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. The bottom of the air extraction pipe penetrates the extension plate and is connected to a connecting air pipe.

[0013] Preferably, a heating wire for heating the gas is fixedly connected inside the extension plate.

[0014] 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.

[0015] 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.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The motor drives the straight plate to move in a circle, and the contact rod continuously contacts the inclined block in the circular groove, pushing the auxiliary frame upward. The elastic pad is stretched and then shakes rapidly, causing the hydraulic retarder heat exchanger body to vibrate. This design simulates the external dynamic influences faced by the hydraulic retarder heat exchanger body in actual use, and can detect tiny leaks that may be caused by dynamic factors, thereby improving the accuracy of leak detection. The high-frequency piezoelectric phased array system releases ultrasonic waves to penetrate the hydraulic retarder heat exchanger body and accelerate the circulation of helium inside it. As a detection medium, the rapid flow of helium can bring the helium at the leak point to the detection area more quickly, so that the detection equipment can capture the leakage signal more timely and accurately, thereby improving the accuracy of leak detection. The ultrasonic waves released by the high-frequency piezoelectric phased array system act on the inside of the hydraulic retarder heat exchanger body, accelerating the dispersion efficiency of the internal gas. This means that during the detection process, the helium can be more evenly distributed inside the heat exchanger, reducing the detection blind area caused by uneven gas distribution, making the detection process more efficient.

[0017] 2. The setting of the gas injection assembly enables helium to be accurately injected into the hydraulic retarder heat exchanger body. The air pump draws mixed gas from the helium tank and the nitrogen tank through the gas pipe, and 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 hydraulic retarder heat exchanger body. This design ensures the accuracy and reliability of gas injection, provides a stable gas environment for subsequent leak detection work, and heats the helium appropriately through the heating wire to increase the activity of the helium and increase its flow rate. This helps the helium to fill the hydraulic retarder heat exchanger body faster, speeds up the detection process, and can complete comprehensive detection in a shorter time, improving the detection efficiency. The helium tank and the nitrogen tank are connected to the mixing pipe together, and the mixing ratio of helium and nitrogen can be flexibly adjusted according to actual needs. Different mixed gases may have better detection effects in certain specific detection scenarios. This flexibility enables the equipment to adapt to a variety of detection requirements and improves the versatility and applicability of the equipment. The recovery pipe in the component can be adapted to the gas valve port to guide the used helium into the straight cylinder and collect it after preliminary filtration by the filter cylinder. This design effectively recovers helium, alleviates the shortage of helium resources, and reduces the cost of detection. It also meets environmental protection requirements and reduces the waste of resources. The recovered helium can be reused after treatment and used again for leak detection of hydraulic retarder heat exchangers. This not only improves the utilization rate of helium, but also ensures a stable supply of gas during the detection process, which helps to maintain the continuity and stability of the detection work.

[0018] 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 automatic transfer of the hydraulic retarder heat exchanger body 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 and the hydraulic retarder heat exchanger body according to the requirements of the inspection process. For example, the feeding conveyor belt conveys 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 conveyed to the idle workstation room for inspection. This design enables the full utilization of the three workstation rooms, avoids the idleness of workstations, and further improves the efficiency of automatic 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 to improve the accuracy and stability of the operation and reduce 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 conveying of the workpiece pallet 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a structural schematic diagram of the inspection room and the reservation rack in the present invention; Figure 3 is a structural schematic diagram of the inspection room in the present invention; Figure 4 is a structural schematic diagram of the workstation room in the present invention; Figure 5 is a structural schematic diagram of the electric guide rail in the present invention; Figure 6 is a structural schematic diagram of the workpiece pallet and the positioning rack in the present invention; Figure 7 is a structural schematic diagram of the workpiece pallet in the present invention; Figure 8 is an exploded structural schematic diagram of the workpiece pallet and the hydraulic retarder heat exchanger body in the present invention; Figure 9 is a sectional structural schematic diagram of the workpiece pallet in the present invention; Figure 10 is a structural schematic diagram of the circular groove in the present invention; Figure 11Schematic cross-sectional structure diagram of the straight cylinder in the present invention; Figure 12 Schematic cross-sectional structure diagram of the flow splitter plate in the present invention.

[0020] In the figure: 100, detection chamber; 101, vacuum pump; 102, nitrogen gas tank; 103, helium gas tank; 104, maintenance ladder; 105, guardrail; 106, liquid retarder heat exchanger body; 200, workpiece support plate; 201, auxiliary frame; 202, positioning plate; 203, elastic pad; 204, pressing piece; 205, screw; 206, sealing piece; 207, venting screw; 208, high-frequency piezoelectric phased array system; 209, gas transmission valve port; 210, motor; 211, round 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, venting 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, predetermined rack; 405, electric guide rail; 406, material transfer belt; 407, lifter; 408, discharge conveyor belt. Detailed implementation manners

[0021] 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 in 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.

[0022] 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 liquid retarder heat exchanger, including a detection chamber 100 and a liquid retarder heat exchanger body 106, and three working station chambers 314 for detecting the liquid retarder heat exchanger body 106 are provided inside the detection chamber 100. By setting three working station chambers 314, the waiting time for detecting the liquid 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.

[0023] Please refer to Figure 6 , Figure 7 and Figure 8, further comprising a workpiece pallet 200 for carrying the hydrodynamic retarder heat exchanger body 106, and a fixing assembly is provided at the top thereof for fixing and sealing the hydrodynamic retarder heat exchanger body 106. A driving assembly is provided inside the workpiece pallet 200 for driving the fixing assembly to vibrate so as to improve the leak detection accuracy of the hydrodynamic retarder heat exchanger body 106. The fixing assembly includes an auxiliary frame 201 provided at 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. While effectively fixing the hydrodynamic retarder heat exchanger body 106, the fixing assembly can block the pipeline at the top of the hydrodynamic retarder heat exchanger body 106. A screwdriver can be used to drive the screw rod 205 and the vent screw rod 207 to rotate, respectively driving the pressing piece 204 and the sealing piece 206 downward to achieve the fixing and sealing of the hydrodynamic retarder heat exchanger body 106. The setting of the positioning plates 202 can effectively limit the horizontal misalignment of the hydrodynamic retarder heat exchanger body 106 and improve the accuracy of workpiece positioning.

[0024] Please refer to Figure 8 , Figure 9 and the inspection chamber 100. Further, the driving assembly includes a motor 210 fixedly connected inside the workpiece pallet 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 a contact 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 inside 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. 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 hydrodynamic 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 then release it after the contact rod 213 passes over the inclined block 214, so as to obtain mechanical kinetic energy and be quickly stressed and vibrated by the elastic pad 203, driving the hydrodynamic retarder heat exchanger body 106 to vibrate, so as to simulate the external dynamic influence faced by the hydrodynamic retarder heat exchanger body 106 during actual use. The ultrasonic wave released by the high-frequency piezoelectric phased array system 208 penetrates the hydrodynamic retarder heat exchanger body 106 and can accelerate the helium gas flow inside the hydrodynamic 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.

[0025] Specifically, the high-frequency piezoelectric phased array system 208 is activated to generate ultrasonic waves into the hydraulic retarder heat exchanger body 106 to accelerate the gas dispersion efficiency inside it. The motor 210 is activated to drive the straight plate 212 to perform circular motion. At this time, the contact rod 213 is placed inside the circular groove 211 and continuously contacts the inclined block 214, thereby pushing the auxiliary frame 201 upward, causing the elastic pad 203 to stretch and vibrate, and making the hydraulic retarder heat exchanger body 106 vibrate.

[0026] 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 the elastic pad 203 stretches, it quickly vibrates, 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, and can detect 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 releases ultrasonic waves to penetrate the hydraulic retarder heat exchanger body 106, accelerating the circulation of helium gas inside it. Helium gas, as the detection medium, can more quickly bring the helium gas at the leakage point to the detection area during its rapid flow, enabling the detection equipment to capture the leakage signal more timely and accurately, and further improving the accuracy of leak detection. The ultrasonic waves released by the high-frequency piezoelectric phased array system 208 act on the inside of the hydraulic retarder heat exchanger body 106, accelerating the gas dispersion efficiency inside. 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 enabling a comprehensive detection to be completed 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 dislocation of the hydraulic retarder heat exchanger body 106 in the horizontal direction, improves the accuracy of workpiece positioning, ensures the stability of the workpiece position during the detection process, and avoids affecting the detection result due to workpiece shaking. The design of the ventilation screw 207 and the sealing piece 206, by driving the ventilation screw 207 to rotate with a screwdriver and driving the sealing piece 206 to move downward, can block the pipeline at the top of the hydraulic retarder heat exchanger body 106. The reliable seal ensures that helium gas will not leak from the pipeline during the detection process, ensuring the stability and accuracy of the detection environment, and providing a guarantee for accurate leak detection.

[0027] Please refer to Figure 6, Figure 11 as well as Figure 12 , and also includes a positioning frame 300, which has three structures and is evenly installed in the interior of the three workstation chambers 314. A diverter plate 302 is arranged on one side of the positioning frame 300, and a gas 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 diverter plate 302, and a utilization component for recovering the used gas is arranged on the other side of the diverter plate 302. By setting the gas injection component, helium can be effectively injected into the interior of the ventilation screw 207 and enter the interior of the hydraulic retarder heat exchanger body 106, so that helium can be obtained under vacuum conditions, and the utilization component can be set to recover the helium for reprocessing and secondary utilization, thereby alleviating the shortage of helium resources.

[0028] Furthermore, the gas injection assembly includes an extension plate 303 fixedly connected to the diverter plate 302, and the top of the diverter plate 302 is fixedly connected to an air pump 301, the air pump 301 is connected to the inside of the extension plate 303 through the diverter plate 302, the top of the detection chamber 100 is fixedly connected to a helium tank 103 and a nitrogen tank 102, and the helium tank 103 and the nitrogen tank 102 are commonly connected to a mixing pipe for mixing gas, the air pump 301 is connected to the mixing pipe through a gas delivery pipe 308, the bottom of the extension plate 303 is connected to a vent nozzle 311, and the internal structure of the vent screw 207 It is hollow and connected to the hydraulic retarder heat exchanger body 106. A gas valve port 209 adapted to the vent nozzle 311 is provided on the top of the vent screw 207. A separate gas path is formed and connected between the extension plate 303, the diverter plate 302 and the output end of the air pump 301. The gas valve port 209 is a closed port. When the vent nozzle 311 is not inserted into the gas valve port 209, it is in a closed state. When the vent nozzle 311 is inserted into the gas valve port 209, the two are connected to supply helium to the interior of the hydraulic retarder heat exchanger body 106, thereby realizing gas injection.

[0029] Among them, the utilization component includes a straight cylinder 304 fixedly connected to one side of the diverter plate 302, one end of the straight cylinder 304 is connected to a recovery pipe 305 that can be adapted to the gas valve port 209, the interior of the recovery pipe 305 is fixedly connected to a solenoid valve 306, the interior of the straight cylinder 304 is fixedly connected to a filter cartridge 307, and the recovery pipe 305 can also be adapted to the gas valve port 209, which can guide the used helium into the interior of the straight cylinder 304 and collect it after preliminary filtration by the filter cartridge 307, thereby improving the utilization rate.

[0030] A vacuum pump 101 is fixedly connected to the top of the detection chamber 100, and an 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 an air connecting pipe 310. The air connecting pipe 310 can be connected to the gas delivery 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 appropriately to increase its activity and increase the flow rate.

[0031] Specifically, the air connection pipe 310 is operated to connect with the air valve port 209 to evacuate the sealing plate 206, and then the extension plate 303 is operated to move downward so that the ventilation nozzle 311 enters and connects with the air valve port 209 inside the ventilation screw 207, and 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 to inject it into 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.

[0032] In summary, the setting of the gas injection assembly enables helium to be accurately injected into 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, and 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 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 increasing its flow rate. This helps helium to fill the inside of the hydraulic retarder heat exchanger body 106 faster, accelerates the detection process, can complete comprehensive detection in a shorter time, and improves detection efficiency. The helium tank 103 and the nitrogen tank 102 are connected to the mixing pipe together, and the mixing ratio of helium and nitrogen can be flexibly adjusted according to actual needs. Different mixed gases may have better detection effects in certain specific detection scenarios. This flexibility enables the equipment to adapt to a variety of detection requirements, improves the versatility and applicability of the equipment, and uses the recovery pipe 305 in the assembly to adapt to the gas delivery valve port 209, and introduces the used helium into the straight cylinder 304, and collects it after preliminary filtration by the filter cylinder 307. This design effectively recovers helium, alleviates the shortage of helium resources, reduces the detection cost, and also meets environmental protection requirements, reduces the waste of resources, and the recovered helium can be reused after treatment 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, which helps to maintain the continuity and stability of the detection work.

[0033] 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 in that: an automatic vacuum helium leak detection device for a hydraulic retarder heat exchanger further includes a discharge conveyor belt 400, which is used to transfer the workpiece pallet 200, and one end of the discharge conveyor belt 400 is provided with a loading conveyor belt 402, and 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 conveying 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 transfer, 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.

[0034] Please refer to Figure 3 、 Figure 4 and Figure 5 , further, an electric guide rail 405 for conveying the workpiece pallet 200 is arranged inside the detection chamber 100, and a discharge conveyor belt 408 for driving the movement of the workpiece pallet 200 is arranged inside each of the three working chambers 314. The bottom of the electric guide rail 405 is fixedly connected with a lifter 407, and the lifting end of the lifter 407 is provided with a transfer belt 406 for driving the workpiece pallet 200 to move onto the discharge conveyor belt 408. By setting the cooperation of the transfer belt 406 and the lifter 407, the workpiece pallet 200 can be lifted and conveyed to an idle working 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.

[0035] Specifically, first, a plurality of hydrodynamic retarder heat exchanger bodies 106 are placed neatly above the feeding conveyor belt 401 in sequence. 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. The two ends at the top of the auxiliary frame 201 can be pulled to allow the hydrodynamic retarder heat exchanger body 106 to be placed inside. Then, the workpiece pallet 200 is placed on the top of the electric guide rail 405 and transported into the interior of the detection chamber 100. When facing the three working station chambers 314, the idle working station chambers 314 are rotated into place in sequence. 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 and thus convey it into the discharge conveyor belt 408, and then the workpiece pallet 200 is conveyed into the interior of the working station chamber 314 for positioning.

[0036] In summary, the coordinated operation of the feeding conveyor belt 401, the loading conveyor belt 402, the discharging 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, detection to discharging. It reduces the 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 detection process. For example, the feeding conveyor belt 401 conveys the body to the loading conveyor belt 402, and the loading conveyor belt 402 then transfers it to the placement rack 403. 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 working station chamber 314 for detection. This design enables the three working station chambers 314 to be fully utilized, avoids the idleness of the working stations, and further improves the efficiency of automatic detection. 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 discharging 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 conveying of the workpiece pallet 200 between different conveying links. This helps to ensure the smooth progress of the detection process and avoid affecting the detection results due to position deviation.

[0037] Working principle: First, multiple hydraulic retarder heat exchanger bodies 106 are placed on the top of the feed conveyor belt 401 in sequence and arranged neatly, and the feed conveyor belt 401 is turned on so that multiple hydraulic retarder heat exchanger bodies 106 are transported to the loading conveyor belt 402 and then transferred to the placement rack 403. The hydraulic retarder heat exchanger body 106 is manually placed on the top of the workpiece support plate 200, and then the screw 205 and the ventilation screw 207 are driven to rotate to fix the hydraulic retarder heat exchanger body 106. The two ends of the top of the auxiliary rack 201 can pull the hydraulic retarder heat exchanger body 106 to be placed inside it; 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 to lift it off the electric guide rail 405 and transport it to the discharge conveyor belt 408. Then, the workpiece pallet 200 is transported to the interior of the workstation room 314 and positioned. 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 delivery 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 delivery 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 delivery 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 at a slow speed to detect the sealing of the weld. At the same time, the high-frequency piezoelectric phased array system 208 is turned on to generate ultrasonic waves to the inside of the hydraulic retarder heat exchanger body 106 to accelerate the internal gas dispersion efficiency. The motor 210 is turned on to drive the straight plate 212 to perform circular motion. At this time, the resistance rod 213 is placed inside the circular groove 211 and continuously resists the inclined block 214, thereby pushing the auxiliary frame 201 to move upward, causing the elastic pad 203 to stretch and shake, causing the hydraulic retarder heat exchanger body 106 to vibrate.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] 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. A vacuum helium leak detection automated device for a hydraulic retarder heat exchanger, comprising a detection chamber (100) and a hydraulic retarder heat exchanger body (106), wherein the detection chamber (100) is provided with three workstation chambers (314) for detecting the hydraulic retarder heat exchanger body (106), characterized in that: Also includes: A workpiece support plate (200) is used to carry a hydraulic retarder heat exchanger body (106), and a fixing component is arranged on the top thereof for fixing and sealing the hydraulic retarder heat exchanger body (106); a driving component is arranged inside the workpiece support plate (200) for driving the fixing component to vibrate so as to improve the leak detection accuracy of the hydraulic retarder heat exchanger body (106); A positioning frame (300) having three components and evenly mounted inside three workstation chambers (314); a flow divider (302) is disposed on one side of the positioning frame (300); a gas injection component for introducing gas into a hydraulic retarder heat exchanger body (106) for detection is disposed on one side of the bottom of the flow divider (302); and a utilization component for recovering used gas is disposed on the other side of the flow divider (302); The gas injection assembly comprises an extension plate (303) fixedly connected to a diverter plate (302), and an air pump (301) is fixedly connected to the top of the diverter plate (302), the air pump (301) is connected to the inside of the extension plate (303) through the diverter plate (302), a helium tank (103) and a nitrogen tank (102) are fixedly connected to the top of the detection chamber (100), and a gas mixing pipe for mixing gas is connected between the helium tank (103) and the nitrogen tank (102), the air pump (301) is connected to the gas mixing pipe through a gas delivery pipe (308), the bottom of the extension plate (303) is connected to a vent nozzle (311), and the internal structure of the vent screw (207) is hollow and connected to the hydraulic retarder heat exchanger body (106).

2. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 1, characterized in that: The fixing assembly comprises an auxiliary frame (201) arranged 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 plate (204) for squeezing a hydraulic retarder heat exchanger body (106) is fixedly connected to the bottom of the screw rod (205), a venting screw rod (207) is threadedly connected to the top of the auxiliary frame (201), and a sealing plate (206) adapted to seal the hydraulic retarder heat exchanger body (106) is provided at the bottom of the venting screw rod (207).

3. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 2, characterized in that: The driving assembly comprises a motor (210) fixedly connected to the inside of the workpiece support plate (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 the top of the straight plate (212) is rotatably connected to a resisting rod (213) disposed inside the circular groove (211); a plurality of inclined blocks (214) are fixedly connected inside the circular groove (211); and the auxiliary frame (201) is connected to the workpiece support plate (200) via an elastic pad (203) so that the auxiliary frame (201) is slightly misaligned.

4. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 2, characterized in that: The top of the ventilation screw (207) is provided with a gas delivery valve port (209) adapted to the ventilation nozzle (311).

5. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 4, characterized in that: The utilization component comprises a straight cylinder (304) fixedly connected to one side of the diverter plate (302); one end of the straight cylinder (304) is connected to a recovery pipe (305) that can be matched with the gas delivery valve port (209); the interior of the recovery pipe (305) is fixedly connected to a solenoid valve (306); and the interior of the straight cylinder (304) is fixedly connected to a filter cartridge (307).

6. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 3, characterized in that: 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).

7. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 4, characterized in that: The top of the detection chamber (100) is fixedly connected to a vacuum pump (101), the output end of the vacuum pump (101) is connected to an exhaust pipe (309), and the bottom of the exhaust pipe (309) passes through the extension plate (303) and is connected to an air connection pipe (310).

8. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 4, characterized in that: A heating wire (312) for heating gas is fixedly connected inside the extension plate (303).

9. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 1, characterized in that: It also includes a discharge conveyor belt (400) for transferring the workpiece pallet (200), and a loading conveyor belt (402) is arranged at one end of the discharge conveyor belt (400), and a plurality of placement racks (403) for temporarily placing hydraulic retarder heat exchanger bodies (106) are arranged at one end of the loading conveyor belt (402), and a predetermined rack (404) for placing the hydraulic retarder heat exchanger bodies (106) in the workpiece pallet (200) for operation is arranged at one side of the placement rack (403), and a feeding conveyor belt (401) for conveying a plurality of hydraulic retarder heat exchanger bodies (106) is arranged at one side of the loading conveyor belt (402).

10. The vacuum helium leak detection automation equipment for a hydraulic retarder heat exchanger according to claim 8, characterized in that: The detection chamber (100) is provided with an electric guide rail (405) for conveying a workpiece pallet (200), and the three workstation chambers (314) are provided with a discharge conveyor belt (408) for driving the workpiece pallet (200) to move. A lifter (407) is fixedly connected to the bottom of the electric guide rail (405), and a conveyor belt (406) for driving the workpiece pallet (200) to move onto the discharge conveyor belt (408) is provided at the lifting end of the lifter (407).

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