Automobile casting sealing performance detection device with pressure feedback function

Abstract

The invention discloses an automobile casting sealing performance detection device with a pressure feedback function, and relates to the technical field of sealing performance detection devices.The sealing performance detection device comprises a base assembly, a table assembly and a clamping assembly, the surface of the table assembly is provided with a detection assembly, and the detection assembly is provided with a pressure assembly; the pressure assembly is used for detecting water tightness and air tightness, a defect marking assembly is arranged in the pressure assembly and used for marking defect points, the table top assembly comprises a connecting flat plate, a connecting column is arranged on the upper surface of the connecting flat plate, the bottom end of the connecting column is fixedly connected with the connecting flat plate, and a top bin is arranged at the top end of the connecting column. The top of the connecting column is fixedly connected with the bottom of the top bin; the base assembly is used for supporting the device and providing a placing platform for the automobile casting, the table board assembly is used for placing the automobile casting, the clamping assembly is used for fixing the automobile casting and sealing through holes in the two ends of the automobile casting, and the defect marking assembly is used for marking the position where pressure changes, so that workers can observe the position conveniently.

Description

Technical Field

[0001] This invention relates to the field of sealing test device technology, specifically a sealing test device for automotive castings with pressure feedback function. Background Technology

[0002] With the continuous development of science and technology and the improvement of industrial production levels, the requirements for the sealing performance of automotive castings are becoming increasingly stringent. Traditional sealing testing procedures include gas sealing testing and water sealing testing. Gas sealing testing is usually based on the principles of gas pressure change, flow monitoring, or tracing gas leakage. It judges the sealing performance by detecting the pressure difference or gas leakage amount inside and outside the tested object. Water sealing testing mostly utilizes the fluidity and pressure of water. It evaluates the water sealing performance by observing whether the tested object shows leakage through water pressure testing, spraying, or immersion.

[0003] The sealing test device needs to perform gas sealing and water sealing tests separately. Because the leakage characteristics of gas and liquid are different, traditional tests need to be performed separately, which results in a long test time. In addition, the test process indirectly determines whether a leak has occurred by comparing the pressure changes in the internal space of the automotive casting. However, the staff cannot directly determine the leak point based on the internal pressure changes, and therefore cannot quickly make adjustments to the automotive casting. Summary of the Invention

[0004] The purpose of this invention is to provide a sealing performance testing device for automotive castings with pressure feedback function, so as to solve the problems mentioned in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The sealing performance testing device includes a base assembly, a platform assembly, and a clamping assembly. The platform assembly has a testing component on its surface, and the testing component has a pressure component. The pressure component is used to test water tightness and air tightness. The pressure component has a defect marking component inside, which is used to mark defect points. The platform assembly includes a connecting plate, and the upper surface of the connecting plate has a connecting column. The bottom end of the connecting column is fixedly connected to the connecting plate, and the top end of the connecting column has a top chamber. The top end of the connecting column is fixedly connected to the bottom end of the top chamber.

[0006] Furthermore, the sealing test device needs to perform gas tightness and water tightness tests separately. Because gas and liquid leakage characteristics are different, traditional tests need to be performed separately, which increases the test time. In addition, the test process indirectly determines whether a leak has occurred by comparing the pressure changes inside the automotive casting. However, the staff cannot directly determine the leak point based on the internal pressure changes, and therefore cannot quickly adjust the automotive casting. The base assembly is used to support the device and provide a platform for placing the automotive casting. The platform assembly is used to place the automotive casting. The clamping assembly is used to fix the automotive casting and seal the through holes at both ends of the automotive casting. The defect marking assembly is used to mark the locations of pressure changes for easy observation by the staff. The platform assembly is located on the upper surface of the base assembly. The connecting plate is fixed to the bottom of the top compartment through the connecting column, providing a placement platform.

[0007] The inspection assembly includes a horizontal plate and a bottom clamping block. The horizontal plate is located at the top of the connecting plate and is fixedly connected to the connecting plate. The bottom clamping block is located at the top of the horizontal plate and is fixedly connected to the bottom of the horizontal plate. The bottom clamping block is used to place the automotive casting. A through groove is opened on the upper surface of the horizontal plate. The through groove is used to cooperate with the through hole at one end of the automotive casting. The main inspection unit is located in the through groove.

[0008] Furthermore, the horizontal plate is fixedly connected to the connecting platform, and the upper surface of the horizontal plate is fixedly connected to the bottom clamping block, wherein the bottom clamping block is used to cooperate with the lower surface of the automotive casting. Then, the through groove on the horizontal plate cooperates with the through hole at the bottom of the automotive casting, and the main detection unit is used to provide a detection environment for the internal space of the automotive casting.

[0009] An annular groove is provided inside the through groove, and the annular groove is connected to the through groove. A capacitor block is provided inside the annular groove, and the capacitor block is fixedly connected to the inner wall of the annular groove.

[0010] Furthermore, because the automotive casting is in a liquid, during the gas tightness test, if a small leak is encountered, the leaking gas will generate bubbles in the liquid. Since the bubbles are inside the pressure component, they will not dissipate and will ultimately affect the pressure component. However, during the water tightness test, if a small leak occurs, the resulting liquid flow is very small. Although it will affect the pressure component, the impact is limited under the influence of the liquid environment. Nevertheless, the leaked liquid will form water droplets inside the automotive casting and eventually move to the through groove under the influence of gravity, where it will be collected by the annular groove. As a result, water molecules will appear in the annular groove. There are two capacitor blocks located in the annular groove. When water molecules appear between the two capacitor blocks, the capacitance value between the two capacitor blocks will change. The more water molecules there are, the smaller the capacitance value.

[0011] The clamping assembly includes a push motor, a push plate, a top clamping block, and a secondary detection unit. The fixed end of the push motor is located inside the top chamber, the output end of the push motor is equipped with a push plate, the top clamping block is located at the bottom of the push plate, the top of the top clamping block is fixedly connected to the push plate, and the bottom of the push plate is equipped with a secondary detection unit.

[0012] Furthermore, the clamping assembly is used to cooperate with the table assembly to fix the automotive casting and seal both ends of the automotive casting. The drive motor is used as a power source to control the movement of the push plate. The movement of the push plate drives the top clamping block to move. The top clamping block is used to cooperate with the upper surface of the automotive casting, so that the top clamping block and the bottom clamping block fix the two ends of the automotive casting. The push plate not only pushes the top clamping block to move, but also drives the secondary detection unit to move, so that the secondary detection unit cooperates with one end of the automotive casting. Thus, through the cooperation of the secondary detection unit and the main detection unit, the through holes at both ends of the automotive casting are sealed.

[0013] The pressure assembly includes a housing, a retaining ring, and a flip door. The housing is located in the main detection unit and is fixedly connected to the main detection unit. The retaining ring is located inside the housing on the side away from the main detection unit. A connecting rod is provided on the outer wall of the retaining ring. The bottom end of the connecting rod is fixedly connected to the retaining ring, and the top end of the connecting rod is fixedly connected to the inner wall of the housing. The flip door is located between the housing and the retaining ring.

[0014] Furthermore, the flip-up door is located between the connecting rod, the outer shell, and the retaining ring, forming multiple valves. These valves are affected by the liquid. The flip-up door is used to detect liquid flow, and the retaining ring is used to cooperate with the automotive casting to restrict it. During the testing process, the automotive casting is placed inside the water tank, in a liquid environment that is stable and therefore does not produce pressure changes. First, an airtightness test is performed, where the detection units at both ends of the automotive casting are vented. At this time, air pressure is generated inside the automotive casting. If the automotive casting being tested has a leakage defect, the air pressure inside the casting will move outward through the leak point. Since the casting is in liquid, the leaked gas will cause liquid flow. The connection of the casting is located inside the outer shell, and the liquid flow will cause the flip-up door to tilt or rotate. Then, a watertightness test is performed. If the automotive casting being tested has a leakage defect, the liquid will move inward through the leak point, and the liquid flow will cause the flip-up door to tilt or rotate.

[0015] The outer shell has a cavity, and the movable component is located inside the cavity. The movable component includes a main disc located at the top of the inner wall of the cavity. A rotating rod is located in the middle of the flip door, and a cylinder is located at the top of the rotating rod. The rotating rod is fixedly connected to the cylinder, and the top of the cylinder is rotatably connected to the main disc. The bottom of the rotating rod is rotatably connected to the outer wall of the retaining ring. A slidable sliding block is fitted on the rotating rod, and a secondary disc is located on the outer wall of the sliding block. The secondary disc is rotatably connected to the sliding block, and a limiting post is located at the top of the secondary disc. The bottom of the main disc is slidably connected to the limiting post, and a protrusion is located at the bottom of the secondary disc. A pressing block is located at the top of the rotating rod, and an elastic element is located between the main disc and the secondary disc.

[0016] Furthermore, the top of the cylinder is rotatably connected to the inner wall of the outer shell, and the bottom of the rotating rod is rotatably connected to the top of the retaining ring. When the tilting door rotates due to the influence of liquid flow, the rotation of the tilting door will drive the rotating rod to rotate, and the rotation of the rotating rod will drive the cylinder to rotate. The main disc is fixedly connected to the bottom of the outer shell and is used to connect to the top of the rotating rod. The auxiliary disc is located at the bottom of the main disc and is sleeved on the rotating rod through a sliding block. The main disc, auxiliary disc, and rotating rod are on the same central axis. Under normal conditions, the tilting door, connecting rod, outer shell, automotive casting, and retaining ring form a sealed space. When the automotive casting leaks, because the connecting end of the automotive casting is inside the outer shell, the resulting flow change will drive the liquid inside the outer shell to flow. This liquid flow will drive or push the tilting door to rotate, and the rotation of the tilting door will drive the cylinder to rotate. The rotating rod rotates, which in turn drives the squeezing block to rotate. As the squeezing block moves, it squeezes the protrusion structure at the bottom of the secondary disc, pushing the secondary disc to move. Because the secondary disc is slidably connected to the main disc through the limiting column, the secondary disc does not rotate but only moves upward. The larger the leak point, the greater the amount of liquid flow pulled, the greater the rotation amplitude of the tilting door, and the longer the movement distance of the secondary disc. Then, the top end of the elastic element is fixedly connected to the bottom end of the main disc, and the bottom end of the elastic element is fixedly connected to the top end of the secondary disc. The elastic element is also electrically connected to an external power source. When the secondary disc moves, it squeezes one end of the elastic element, causing the elastic element to deform and reducing its resistance value. In other words, the lower the resistance value, the larger the leak point.

[0017] The defect marking assembly includes a limiting block, a solenoid valve, and a spray head. A cavity is provided inside the retaining ring, and the bottom end of the rotating rod extends into the cavity. The spray head is located at the bottom end of the rotating rod. A limiting block is provided inside the output end of the spray head, and a spring is provided between the limiting block and the spray head. A solenoid valve is provided outside the output end of the spray head.

[0018] Furthermore, before entering the inspection process, the solenoid valve is in the closed state. Even if the spray head comes into contact with the automotive casting, it cannot be marked due to the restriction of the solenoid valve. When entering the inspection process, that is, when the automotive casting is completely covered by liquid, the solenoid valve is in the open state. The limiting block extends outward under the push of the spring, blocking the output end of the spray head. Then, during the inspection process, the rotating rod rotates, which drives the rotating rod to move downward, pushing the spray head to move. Finally, the limiting block in the spray head will come into contact with the outer wall of the automotive casting. Because the outer wall of the automotive casting is in contact with the limiting block, if the spray head continues to move under these circumstances, a gap will be created between the limiting block and the spray head, allowing the fluorescent paint in the spray head to come into contact with the automotive casting, thereby achieving its marking.

[0019] The base assembly includes a housing located on a horizontal ground. A drive motor is installed inside the housing. The fixed end of the drive motor is fixedly connected to the bottom of the inner wall of the housing. A water tank is installed at the output end of the drive motor, and the water tank is located at the bottom of the connecting plate.

[0020] Furthermore, the internal space of the enclosure is used to house the water tank, and the drive motor at the bottom of the water tank is used to move the water tank so that it wraps around the connecting plate and also wraps around the automotive casting, thus placing the automotive casting in a liquid environment.

[0021] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the automotive casting is placed inside the water tank. During the airtightness test, the detection units at both ends of the automotive casting are ventilated. At this time, air pressure is generated inside the automotive casting. If there is a defect, leakage will occur. The leaked gas will cause liquid flow. The liquid flow will cause the tilting door to tilt or rotate. Through the transmission of the auxiliary disc, the elastic element changes, and the resistance value decreases accordingly. The lower the resistance value of the elastic element, the larger the leakage point. The same applies to the watertightness test. The larger the leakage point, the greater the amount of liquid flow pulled, and the greater the rotation amplitude of the tilting door. Thus, two tests on the automotive casting can be performed under the same device.

[0022] 2. In the detection process of this invention, the solenoid valve is in the open state. Then, the limiting block extends outward under the push of the spring, blocking the output end of the spray head. If the rotating rod rotates, it will drive the rotating rod to move downward, pushing the spray head to move. Finally, the limiting block in the spray head will contact the outer wall of the automobile casting. Because the outer wall of the automobile casting is in contact with the limiting block, if the spray head continues to move under these circumstances, a gap will be generated between the limiting block and the spray head, allowing the fluorescent paint in the spray head to contact the automobile casting, thereby achieving its marking.

[0023] 3. In the process of gas tightness testing, if a small leak occurs, the leaked gas will generate bubbles in the liquid. Since the bubbles are inside the pressure component, they will not dissipate and will eventually affect the pressure component. However, in the process of water tightness testing, if a small leak occurs, the liquid flow amplitude is very small and the rotation amplitude of the rotating rod is limited. However, the leaked liquid will form water droplets inside the automotive casting and eventually move to the through groove under the influence of gravity and be collected by the annular groove. Thus, when water molecules appear between the two capacitor blocks, the capacitance value between the two capacitor blocks will change. The more water molecules there are, the smaller the capacitance value, thereby effectively preventing the inability to detect and judge due to the small leak point. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the clamping assembly of the present invention; Figure 3 This is a schematic diagram of the outer casing of the present invention; Figure 4 This is a schematic diagram of the clasp structure of the present invention; Figure 5 This is a schematic diagram of the structure of the flip door of the present invention; Figure 6 This is a schematic diagram of the structure of the main disk of the present invention; Figure 7 This is a schematic diagram of the extrusion block of the present invention; Figure 8 For the present invention Figure 5 Enlarged view of point A in the middle section; Figure 9 This is a schematic diagram of the structure of the bottom card block of the present invention; Figure 10 This is a schematic diagram of the annular groove of the present invention; Figure 11 This is a schematic diagram of the defect marking component of the present invention; Figure 12 This is a schematic diagram of the base assembly of the present invention.

[0025] In the diagram: 1. Base assembly; 11. Housing; 12. Drive motor; 13. Water tank; 2. Tabletop assembly; 21. Connecting plate; 22. Connecting column; 23. Top compartment; 3. Clamping assembly; 31. Push motor; 32. Push plate; 33. Top clamping block; 34. Secondary detection unit; 4. Detection assembly; 41. Horizontal plate; 411. Through groove; 412. Annular groove; 42. Bottom clamping block; 43. Main detection unit; 44. Capacitor block; 5. Pressure assembly; 51. Housing; 52. Snap ring; 53. Flip door; 54. Connecting rod; 6. Defect marking assembly; 61. Limiting block; 62. Solenoid valve; 63. Spray head; 64. Spring; 7. Movable assembly; 71. Main disc; 72. Secondary disc; 73. Rotating rod; 74. Cylinder; 75. Sliding block; 76. Limiting column; 77. Protrusion; 78. Extrusion block; 79. Elastic element. Detailed Implementation

[0026] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example: Figures 1-12 As shown, the present invention provides a sealing performance testing device for automotive castings with pressure feedback function. The sealing performance testing device includes a base assembly 1, a platform assembly 2, and a clamping assembly 3. A detection assembly 4 is provided on the surface of the platform assembly 2. The detection assembly 4 is provided with a pressure assembly 5. The pressure assembly 5 is used to detect water tightness and air tightness. A defect marking assembly 6 is provided inside the pressure assembly 5. The defect marking assembly 6 is used to mark defect points. The platform assembly 2 includes a connecting plate 21. A connecting column 22 is provided on the upper surface of the connecting plate 21. The bottom end of the connecting column 22 is fixedly connected to the connecting plate 21. A top chamber 23 is provided at the top end of the connecting column 22. The top end of the connecting column 22 is fixedly connected to the bottom end of the top chamber 23.

[0028] Specifically, the sealing test device needs to perform gas tightness and water tightness tests separately. Because the leakage characteristics of gas and liquid are different, traditional tests need to be performed separately, which increases the test time. In addition, the test process indirectly determines whether a leak has occurred by comparing the pressure changes in the internal space of the automotive casting. However, the staff cannot directly determine the leak point based on the internal pressure changes, and therefore cannot quickly adjust the automotive casting. The base assembly 1 is used to support the device and provide a platform for placing the automotive casting. The platform assembly 2 is used to place the automotive casting. The clamping assembly 3 is used to fix the automotive casting and seal the through holes at both ends of the automotive casting. The defect marking assembly 6 is used to mark the places where the pressure changes, so that the staff can observe them. The platform assembly 2 is located on the upper surface of the base assembly 1. The connecting plate 21 is fixed to the bottom of the top chamber 23 through the connecting column 22, providing a placement platform.

[0029] like Figure 1 , Figure 2 , Figure 9 As shown, the detection component 4 includes a horizontal plate 41 and a bottom clamping block 42. The horizontal plate 41 is located at the top of the connecting plate 21 and is fixedly connected to the connecting plate 21. The bottom clamping block 42 is provided at the top of the horizontal plate 41 and is fixedly connected to the bottom of the horizontal plate 41. The bottom clamping block 42 is used to place the automotive casting. A through groove 411 is provided on the upper surface of the horizontal plate 41. The through groove 411 is used to cooperate with the through hole at one end of the automotive casting. The main detection unit 43 is provided in the through groove 411.

[0030] Specifically, the horizontal plate 41 is fixedly connected to the connecting platform, and the upper surface of the horizontal plate 41 is fixedly connected to the bottom clamping block 42, wherein the bottom clamping block 42 is used to cooperate with the lower surface of the automobile casting. Then, the through groove 411 on the horizontal plate 41 cooperates with the bottom through hole of the automobile casting, and the main detection unit 43 is used to provide a detection environment for the internal space of the automobile casting.

[0031] like Figure 10 As shown, an annular groove 412 is provided in the through groove 411. The annular groove 412 is connected to the through groove 411. A capacitor block 44 is provided in the annular groove 412. The capacitor block 44 is fixedly connected to the inner wall of the annular groove 412.

[0032] Specifically, because the automotive casting is in a liquid, during the gas tightness test, if a small leak is encountered, the leaked gas will generate bubbles in the liquid. Since the bubbles are inside the outer shell 51, they will not dissipate. Ultimately, the bubbles will affect the flip door 53. However, during the water tightness test, if a small leak occurs, the resulting liquid flow is very small. Although it will affect the flip door 53, the impact is limited under the influence of the liquid environment. However, the leaked liquid will form water droplets inside the automotive casting and eventually move to the through groove 411 under the influence of gravity. It will be collected by the annular groove 412 of the through groove 411, and water molecules will appear in the annular groove 412. There are two capacitor blocks 44 located in the annular groove 412. When water molecules appear between the two capacitor blocks 44, the capacitance value between the two capacitor blocks 44 will change. The more water molecules there are, the smaller the capacitance value.

[0033] like Figure 2 As shown, the clamping assembly 3 includes a push motor 31, a push plate 32, a top clamping block 33, and a secondary detection unit 34. The fixed end of the push motor 31 is located inside the top chamber 23. The output end of the push motor 31 is provided with the push plate 32. The top clamping block 33 is located at the bottom end of the push plate 32. The top end of the top clamping block 33 is fixedly connected to the push plate 32. The bottom end of the push plate 32 is provided with the secondary detection unit 34.

[0034] Specifically, the clamping component 3 is used to cooperate with the table component 2 to fix the automotive casting and seal both ends of the automotive casting. The drive motor 31 is used as a power source to control the movement of the push plate 32. The movement of the push plate 32 drives the top clamping block 33 to move. The top clamping block 33 is used to cooperate with the upper surface of the automotive casting, so that the top clamping block 33 and the bottom clamping block 42 fix both ends of the automotive casting. The push plate 32 not only pushes the top clamping block 33 to move, but also drives the secondary detection unit 34 to move, so that the secondary detection unit 34 cooperates with one end of the automotive casting. Thus, through the cooperation of the secondary detection unit 34 and the main detection unit 43, the sealing of the through holes at both ends of the automotive casting is achieved.

[0035] like Figures 3-5 As shown, the pressure assembly 5 includes a housing 51, a retaining ring 52, and a flip door 53. The housing 51 is located in the main detection unit 43 and is fixedly connected to the main detection unit 43. The retaining ring 52 is located inside the housing 51 on the side away from the main detection unit 43. A connecting rod 54 is provided on the outer wall of the retaining ring 52. The bottom end of the connecting rod 54 is fixedly connected to the retaining ring 52, and the top end of the connecting rod 54 is fixedly connected to the inner wall of the housing 51. The flip door 53 is located between the housing 51 and the retaining ring 52.

[0036] Specifically, the flip door 53 is located between the connecting rod 54, the outer shell 51, and the retaining ring 52, forming multiple valves. These valves are affected by the liquid. The flip door 53 is used to detect liquid flow, and the retaining ring 52 is used to cooperate with the automotive casting to restrict it. During the testing process, the automotive casting is placed inside the water tank 13, in a liquid environment that is stable and does not cause pressure changes. First, an air tightness test is performed, during which the detection units at both ends of the automotive casting are vented. At this time, air pressure is generated inside the automotive casting. If the automotive casting being tested has a leakage defect, the air pressure inside the casting will move outward through the leak point. Since the casting is in liquid, the leaked gas will cause the liquid to flow. The connection of the casting is located inside the outer shell 51, and the liquid flow will cause the flip door 53 to tilt or rotate. Then, a water tightness test is performed. If the automotive casting being tested has a leakage defect, the liquid will move inward through the leak point, and the liquid flow will cause the flip door 53 to tilt or rotate.

[0037] like Figures 5-8As shown, a cavity is provided inside the outer shell 51, and the movable component 7 is located inside the cavity of the outer shell 51. The movable component 7 includes a main disc 71, which is located at the top of the inner wall of the cavity. A rotating rod 73 is provided in the middle of the flip door 53, and a cylinder 74 is provided at the top of the rotating rod 73. The rotating rod 73 is fixedly connected to the cylinder 74, and the top of the cylinder 74 is rotatably connected to the main disc 71. The bottom of the rotating rod 73 is rotatably connected to the outer wall of the retaining ring 52. A slidable sliding block 75 is sleeved on the rotating rod 73. A secondary disc 72 is provided on the outer wall of the sliding block 75. The secondary disc 72 is rotatably connected to the sliding block 75. A limiting post 76 is provided at the top of the secondary disc 72. The bottom of the main disc 71 is slidably connected to the limiting post 76. A protrusion 77 is provided at the bottom of the secondary disc 72. A pressing block 78 is provided at the top of the rotating rod 73. An elastic element 79 is provided between the main disc 71 and the secondary disc 72.

[0038] Specifically, the top of cylinder 74 is rotatably connected to the inner wall of outer shell 51, and the bottom of rotating rod 73 is rotatably connected to the top of retaining ring 52. When the tilting door 53 rotates due to the flow of liquid, the rotation of the tilting door 53 will drive the rotation of rotating rod 73, which in turn will drive the rotation of cylinder 74. The main disc 71 is fixedly connected to the bottom of outer shell 51 and is used to connect to the top of rotating rod 73. The auxiliary disc 72 is located at the bottom of the main disc 71 and is sleeved on the rotating rod 73 through sliding block 75. The main disc 71, auxiliary disc 72, and rotating rod 73 are on the same central axis. Under normal conditions, the tilting door 53, connecting rod 54, outer shell 51, automotive casting, and retaining ring 52 form a sealed space. When the automotive casting leaks, because the connecting end of the automotive casting is inside outer shell 51, the resulting flow change will drive the liquid inside outer shell 51 to flow. This liquid flow will drive or push the tilting door 53 to rotate. The rotation will cause the rotating rod 73 to rotate, which in turn will cause the squeezing block 78 to rotate. During the movement, the squeezing block 78 will squeeze the protrusion 77 structure at the bottom of the sub-disc 72, which will push the sub-disc 72 to move. Since the sub-disc 72 is slidably connected to the main disc 71 through the limiting post 76, the sub-disc 72 will not rotate, but will only move upward. When the leakage point is larger, the amount of liquid flow pulled is greater, the rotation amplitude of the flip door 53 is greater, and the moving distance of the sub-disc 72 is longer. Then, the top end of the elastic element 79 is fixedly connected to the bottom end of the main disc 71, and the bottom end of the elastic element 79 is fixedly connected to the top end of the sub-disc 72. The elastic element 79 is also electrically connected to an external power source. When the sub-disc 72 moves, it will squeeze one end of the elastic element 79, causing the elastic element 79 to deform, resulting in a decrease in the resistance value of the elastic element 79. That is, the lower the resistance value, the larger the leakage point.

[0039] like Figure 11As shown, the defect marking assembly 6 includes a limiting block 61, a solenoid valve 62, and a spray head 63. A cavity is provided inside the retaining ring 52, and the bottom end of the rotating rod 73 extends into the cavity. The spray head 63 is located at the bottom end of the rotating rod 73. The limiting block 61 is provided inside the output end of the spray head 63, and a spring 64 is provided between the limiting block 61 and the spray head 63. The solenoid valve 62 is provided outside the output end of the spray head 63.

[0040] Specifically, before entering the inspection process, the solenoid valve 62 is in the closed state. Even if the spray head 63 comes into contact with the automotive casting, it cannot be marked due to the restriction of the solenoid valve 62. When entering the inspection process, that is, when the automotive casting is completely covered by liquid, the solenoid valve 62 is in the open state. The limiting block 61 extends outward under the push of the spring 64, blocking the output end of the spray head 63. Then, during the inspection process, the rotating rod 73 rotates, which drives the rotating rod 73 to move downward, pushing the spray head 63 to move. Finally, the limiting block 61 in the spray head 63 will come into contact with the outer wall of the automotive casting. Because the outer wall of the automotive casting is in contact with the limiting block 61, if the spray head 63 continues to move under these circumstances, a gap will be generated between the limiting block 61 and the spray head 63, allowing the fluorescent paint in the spray head 63 to come into contact with the automotive casting, thereby achieving marking.

[0041] like Figure 12 As shown, the base assembly 1 includes a housing 11, which is located on a horizontal ground. A drive motor 12 is provided inside the housing 11. The fixed end of the drive motor 12 is fixedly connected to the bottom of the inner wall of the housing 11. A water tank 13 is provided at the output end of the drive motor 12, and the water tank 13 is located at the bottom of the connecting plate 21.

[0042] Specifically, the internal space of the housing 11 is used to place the water tank 13, and the drive motor 12 at the bottom of the water tank 13 is used to push the water tank 13 to move, so that the water tank 13 wraps around the connecting plate 21, and also wraps around the automobile casting, so that the automobile casting is in a liquid environment.

[0043] Working principle: Before testing, the operator places the car casting on the bottom clamping block 42, and then moves the push plate 32 by the drive motor 31, so that the top clamping block 33 cooperates with the bottom clamping block 42 to fix the car casting, and the pressure component 5 seals both ends of the car casting. Then, the water tank 13 is moved by the drive motor 12, so that the water tank 13 wraps around the connecting plate 21 and also wraps around the car casting, so that the car casting is in a liquid environment. Next, the air tightness test is performed, in which the detection units at both ends of the car casting are vented. At this time, air pressure is generated inside the car casting. If the tested car casting has a leakage defect, In automotive castings, the air pressure inside the casting will move outward through the leak point. Since the casting is submerged in liquid, the leaking gas will cause the liquid to flow. The connection point of the casting is located inside the outer casing 51. The liquid flow will cause the tilting door 53 to tilt or rotate. After the airtightness test is completed, the watertightness test is performed. If the tested automotive casting has a leakage defect, the liquid will move inward through the leak point. The liquid flow will cause the tilting door 53 to tilt or rotate. During this process, if a small leak point is encountered, the detection units at both ends of the casting will pump air, creating a negative pressure state inside the casting. The casting is a defective automotive casting with leakage. External liquid, under pressure, will enter the casting through the leak point. The leaked gas will generate bubbles within the liquid. Because these bubbles are inside the outer shell 51, they will not dissipate. Ultimately, these bubbles will affect the tilting door 53. However, during water tightness testing, even a small leak will cause a very small liquid flow. Although it will affect the tilting door 53, the impact is limited under the influence of the liquid environment. Nevertheless, the leaked liquid will form water droplets inside the automotive casting, which will eventually move to the channel 411 under gravity and be collected by the annular groove 412 of the channel 411. Water molecules appear in the annular groove 412, causing a change in the capacitance value between the two capacitor blocks 44. The more water molecules there are, the smaller the capacitance value, thus detecting even small leakage values ​​and ensuring accuracy. Finally, during the detection process, the rotating rod 73 rotates, causing it to move downwards and pushing the spray head 63. Eventually, the limiting block 61 in the spray head 63 comes into contact with the outer wall of the automotive casting. Because the outer wall of the automotive casting is in contact with the limiting block 61, if the spray head 63 continues to move, a gap will be created between the limiting block 61 and the spray head 63, allowing the fluorescent paint in the spray head 63 to come into contact with the automotive casting, thereby marking it.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing performance testing device for automotive castings with pressure feedback function, characterized in that: The sealing test device includes a base assembly (1), a platform assembly (2) and a clamping assembly (3). The surface of the platform assembly (2) is provided with a test assembly (4). The test assembly (4) is provided with a pressure assembly (5). The pressure assembly (5) is used to test water tightness and air tightness. The pressure assembly (5) is provided with a defect marking assembly (6). The defect marking assembly (6) is used to mark defect points. The platform assembly (2) includes a connecting plate (21). The upper surface of the connecting plate (21) is provided with a connecting column (22). The bottom end of the connecting column (22) is fixedly connected to the connecting plate (21). The top end of the connecting column (22) is provided with a top chamber (23). The top end of the connecting column (22) is fixedly connected to the bottom end of the top chamber (23).

2. The sealing performance testing device for automotive castings with pressure feedback function according to claim 1, characterized in that: The detection component (4) includes a horizontal plate (41) and a bottom clamping block (42). The horizontal plate (41) is located at the top of the connecting plate (21). The horizontal plate (41) is fixedly connected to the connecting plate (21). The bottom clamping block (42) is provided at the top of the horizontal plate (41). The bottom end of the bottom clamping block (42) is fixedly connected to the horizontal plate (41). The bottom clamping block (42) is used to place the automobile casting. A through groove (411) is provided on the upper surface of the horizontal plate (41). The through groove (411) is used to cooperate with the through hole at one end of the automobile casting. The main detection unit (43) is provided in the through groove (411).

3. The sealing performance testing device for automotive castings with pressure feedback function according to claim 2, characterized in that: An annular groove (412) is provided in the through groove (411), the annular groove (412) is connected to the through groove (411), and a capacitor block (44) is provided in the annular groove (412), the capacitor block (44) is fixedly connected to the inner wall of the annular groove (412).

4. The sealing performance testing device for automotive castings with pressure feedback function according to claim 3, characterized in that: The clamping assembly (3) includes a push motor (31), a push plate (32), a top clamping block (33), and a secondary detection unit (34). The fixed end of the push motor (31) is located inside the top chamber (23). The output end of the push motor (31) is provided with the push plate (32). The top clamping block (33) is located at the bottom end of the push plate (32). The top end of the top clamping block (33) is fixedly connected to the push plate (32). The bottom end of the push plate (32) is provided with the secondary detection unit (34).

5. A sealing performance testing device for automotive castings with pressure feedback function according to claim 4, characterized in that: The pressure assembly (5) includes a housing (51), a retaining ring (52), and a flip door (53). The housing (51) is located in the main detection unit (43) and is fixedly connected to the main detection unit (43). The retaining ring (52) is located inside the housing (51) on the side away from the main detection unit (43). A connecting rod (54) is provided on the outer wall of the retaining ring (52). The bottom end of the connecting rod (54) is fixedly connected to the retaining ring (52), and the top end of the connecting rod (54) is fixedly connected to the inner wall of the housing (51). The flip door (53) is located between the housing (51) and the retaining ring (52).

6. A sealing performance testing device for automotive castings with pressure feedback function according to claim 5, characterized in that: The outer shell (51) has a cavity inside, and the movable component (7) is located inside the cavity of the outer shell (51). The movable component (7) includes a main disc (71), which is located at the top of the inner wall of the cavity. The flip door (53) has a rotating rod (73) in the middle, and a cylinder (74) is provided at the top of the rotating rod (73). The rotating rod (73) and the cylinder (74) are fixedly connected. The top of the cylinder (74) is rotatably connected to the main disc (71), and the bottom of the rotating rod (73) is rotatably connected to the outer wall of the retaining ring (52). A sliding block (75) is fitted on the rotating rod (73). A secondary disc (72) is provided on the outer wall of the sliding block (75). The secondary disc (72) is rotatably connected to the sliding block (75). A limiting post (76) is provided at the top of the secondary disc (72). The bottom end of the main disc (71) is slidably connected to the limiting post (76). A protrusion (77) is provided at the bottom of the secondary disc (72). A pressing block (78) is provided at the top of the rotating rod (73). An elastic element (79) is provided between the main disc (71) and the secondary disc (72).

7. A sealing performance testing device for automotive castings with pressure feedback function according to claim 6, characterized in that: The defect marking assembly (6) includes a limiting block (61), a solenoid valve (62), and a spray head (63). A cavity is provided in the retaining ring (52), and the bottom end of the rotating rod (73) extends into the cavity. The spray head (63) is located at the bottom end of the rotating rod (73). A limiting block (61) is provided in the output end of the spray head (63), and a spring (64) is provided between the limiting block (61) and the spray head (63). A solenoid valve (62) is provided on the outside of the output end of the spray head (63).

8. A sealing performance testing device for automotive castings with pressure feedback function according to claim 7, characterized in that: The base assembly (1) includes a box (11) located on a horizontal ground. A drive motor (12) is provided inside the box (11). The fixed end of the drive motor (12) is fixedly connected to the bottom of the inner wall of the box (11). A water tank (13) is provided at the output end of the drive motor (12). The water tank (13) is located at the bottom of the connecting plate (21).

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