Joint sealing test machine

Abstract

The invention discloses a connector sealing performance testing machine, and relates to the field of connector production, and the connector sealing performance testing machine comprises a workbench, a sealing cabin is fixed on the workbench, a sealing cover is hinged to the sealing cabin, a connector seat is arranged in the sealing cabin, a sealing block is slidably connected in the sealing cabin, and a sealing seat is arranged at the bottom of the sealing cabin. A pressing rotary cleaning mechanism is arranged between the sealing seat and the sealing block in the sealing cabin, and an extrusion expansion sealing mechanism is arranged on the sealing seat. The pressing rotary cleaning mechanism is used for carrying out auxiliary cleaning on the connector end, and the extrusion expansion sealing mechanism is used for further sealing, so that the source of misjudgment caused by end face pollution and unreal single-end test conditions can be eliminated from the physical level, and a helium detection result can truly and accurately reflect the sealing performance of a connector body.

Description

Technical Field

[0001] This application relates to the field of connector manufacturing, and in particular to connector sealing testing machines. Background Technology

[0002] In industrial production, especially in the field of fluid transmission, various joints are key basic components connecting the various units of the system. The quality of their sealing performance directly affects the reliability, safety and working efficiency of the entire system. Therefore, after the joints are manufactured, their sealing performance must be strictly tested to eliminate unqualified products and ensure that the quality of the products leaving the factory meets the standards.

[0003] Currently, helium mass spectrometry leak detection technology is widely used for high-precision testing of joint sealing performance. This technology uses helium as a tracer gas to determine the sealing level of the joint by detecting trace amounts of helium leakage. It has the advantages of high sensitivity, good accuracy, and non-destructive nature, and has become the mainstream method for testing high-requirement sealing performance.

[0004] The existing helium testing workflow is usually as follows: the operator manually places the connector to be tested into the test fixture, seals one end of the connector and fills it with helium gas, then uses a vacuum system to evacuate the test chamber, and uses a helium mass spectrometer leak detector to monitor whether helium molecules appear in the test chamber, thereby determining whether there is a leak in the connector.

[0005] However, the sealing surface of the connector test end may be covered with dust, oil or fine particles before clamping. If it is not effectively cleaned, these contaminants will cause interface leakage when the seal is tightened. Helium gas will escape from the tightening surface and be detected by the leak detector, thus misjudging it as a leak in the connector body, resulting in qualified products being discarded and helium resources being wasted. Summary of the Invention

[0006] The purpose of this application is to address the problem mentioned in the background art that the sealing surface of the joint test end may be covered with dust, oil, or fine particles before clamping. If these contaminants are not effectively cleaned, they will cause interface leakage during compression sealing, and helium gas will escape from the compression surface. This leakage will be detected by the leak detector, leading to a misjudgment of the joint body as a leak, resulting in the rejection of qualified products and the waste of helium resources. This application provides a joint sealing performance testing machine.

[0007] To achieve the above objectives, this application specifically adopts the following technical solution: A joint sealing tester includes a workbench with a sealing chamber fixed on it. A sealing cover is hinged to the sealing chamber. A joint seat is located inside the sealing chamber, and a through hole corresponding to the joint is provided on the joint seat. A sealing block is slidably connected inside the sealing chamber. A sealing seat is located at the bottom of the sealing chamber. A linear drive is fixed to the top of the sealing chamber. A pressure tube is fixed to the telescopic end of the linear drive. The pressure tube passes through the sealing chamber and is slidably connected to it. One end of the pressure tube is fixedly connected to the sealing block. A through hole corresponding to the pressure tube is provided on the sealing block. A helium connector is fixed to the end of the pressure tube away from the sealing block. A helium mass spectrometer leak detector is mounted on the workbench. A vacuum pump is mounted on the side of the workbench near the helium mass spectrometer leak detector. The vacuum pump is connected to the helium mass spectrometer leak detector via a pipe. The helium mass spectrometer leak detector is connected to the sealing chamber via a pipe. A pressure-rotation cleaning mechanism is provided between the sealing seat and the sealing block inside the sealing chamber. A compression-expansion sealing mechanism is provided on the sealing seat.

[0008] By adopting the above technical solution, the pressure-rotating cleaning mechanism and the extrusion-expansion sealing mechanism are integrated, and multiple processes such as joint clamping, end face cleaning, double-end sealing, and helium filling testing are integrated into an automated process. The pressure-rotating cleaning mechanism is used to assist in cleaning the joint end, and the extrusion-expansion sealing mechanism is used for further sealing. This reduces the influence of small amounts of helium in the air, significantly improves testing efficiency, and, more importantly, eliminates the root cause of misjudgment caused by end face contamination and unrealistic single-end testing conditions from a physical perspective. This ensures that the helium test results can truly and accurately reflect the sealing performance of the joint body.

[0009] Furthermore, the downward rotating cleaning mechanism includes a cleaning ring disposed on the side of the sealing block near the sealing seat. The cleaning ring is rotatably connected to the sealing block. Several circumferentially distributed cleaning rods are fixed on the inner wall of the cleaning ring. A cleaning pad is fixed to the end of the cleaning rod away from the cleaning ring. A rotating assembly is disposed between the cleaning ring and the sealing block.

[0010] By adopting the above technical solution, the rotating cleaning ring drives the flexible cleaning pad to automatically perform physical cleaning on the key sealing surfaces of the joint before the seal is tightened, thereby effectively removing contaminants such as dust and oil, and fundamentally avoiding the waste of expensive helium gas and false alarms caused by interface leakage.

[0011] Furthermore, the rotating assembly includes a fixing screw fixed on the connector seat, a nut sleeve threadedly connected to the fixing screw, the nut sleeve being rotatably connected to the bottom surface of the sealing block, a toothed ring one fixed on the nut sleeve, a toothed ring two meshing on the toothed ring one, and the inner wall of the toothed ring two being fixedly connected to the cleaning ring.

[0012] By adopting the above technical solution, when the linear drive component drives the sealing block to press down, since the fixed screw is stationary, the nut sleeve is forced to rotate downward along the thread, converting the linear motion into rotational motion, thereby driving the first gear ring to rotate. The first gear ring drives the second gear ring and the cleaning ring fixed thereto to rotate, thus realizing a true pure mechanical linkage, which allows the cleaning ring to rotate during the descent of the sealing block.

[0013] Furthermore, the compression expansion sealing mechanism includes a support base fixed inside the sealing chamber, the sealing base fixed on the support base, the connector base fixed on the support base, a sealing rod fixed on the sealing base, the sealing rod having a T-shaped cross-section, a positioning ring fixed on the sealing base, the positioning ring fitting the sealing rod in the middle, an annular rubber ring fitted on the sealing rod, sealing corrugated rings fixedly connected to both sides of the annular rubber ring and the sealing rod, and a pressure-applying component provided between the sealing rod and the sealing block.

[0014] By adopting the above technical solution, the pressurizing component inflates the sealed air chamber composed of the annular rubber ring and the sealing corrugated ring, allowing the annular rubber ring to abut against the inner wall of the joint to form a seal. This complements the end face seal of the joint, greatly expanding the types of joints and sealing forms that the testing machine can test.

[0015] Furthermore, the pressurizing assembly includes a pressurizing column disposed on one side of the connector seat. The pressurizing column is hollow with open ends. One end of the pressurizing column is fixedly connected to the support seat. A pressurizing channel is provided inside the support seat. The pressurizing channel connects the sealing rod and the pressurizing column. A piston component is disposed on the pressurizing column.

[0016] By adopting the above technical solution, the pressure column is a cylinder that is vertically fixed to the side of the connector seat. Its internal cavity is connected to the sealed air cavity at the front end of the sealing rod through a slender channel machined in the support seat. This makes the entire pressure system compact, without exposed pipelines, aesthetically pleasing and safe. At the same time, the closed channel ensures the cleanliness of the transmitted medium and improves the reliability and lifespan of the compression expansion sealing mechanism.

[0017] Furthermore, the piston component includes a piston block slidably connected within the pressure column, a piston rod fixed to the piston block, a lowering block fixed to the piston rod, an abutment block provided on the lowering block, and the abutment block being fixedly connected to the sealing block.

[0018] By adopting the above technical solution, when the sealing block is pressed down, the abutment block fixed on its side contacts and presses down the pressing block, thereby pushing the piston rod and piston block to move downward in the pressure column, thus ensuring the timeliness and consistency of seal establishment and further improving the sealing effect of the joint.

[0019] In summary, this application includes at least one of the following beneficial effects; 1. In this application, a linear drive mechanism initiates the downward movement of the pressure tube and the sealing block fixed thereto. In the initial stage of pressure, the cleaning ring at the bottom of the sealing block first contacts the end face of the joint through the cleaning pad at the end of its flexible cleaning rod. As the sealing block continues to press down, the rotating assembly between the cleaning ring and the bottom surface of the sealing block begins to operate. The fixing screw, which is vertically fixed on the joint seat, remains stationary. Under axial pressure, the nut sleeve, which is rotatably connected to the bottom surface of the sealing block, is forced to rotate downward along the thread of the fixing screw. The rotation of the nut sleeve is transmitted through the toothed ring one on it to the toothed ring two fixed to the cleaning ring, thereby driving the entire cleaning ring and its cleaning rod and cleaning pad to rotate, completing the wiping and cleaning of the end face and sides of the joint. This achieves automatic physical cleaning of the key sealing surfaces of the joint before the seal is tightened, effectively removing contaminants such as dust and oil, and fundamentally avoiding the waste of expensive helium gas and false alarms caused by interface leakage.

[0020] 2. In this application, as the sealing block descends, the abutment block on the side of the sealing block contacts and presses down on the pressing block at the top of the piston rod during the descent, pushing the piston rod and piston block downward within the pressure column, compressing the air inside. The compressed air enters the sealed air chamber formed by the annular rubber ring at the front end of the sealing rod and the sealing corrugated rings on both sides through the pressure channel in the support seat. This forces the annular rubber ring to expand outward, tightly fitting the inner wall of the lower end of the joint, forming an auxiliary seal from the inside. This achieves radial sealing of the joint's interior, thus complementing the end face seal of the joint. This greatly expands the types of joints and sealing forms that the testing machine can test, further improving the sealing effect and reducing the impact of dust, oil, and other contaminants on the joint seal.

[0021] 3. In this application, the piston block and the inner wall of the pressure column are precisely slidably fitted together. The piston rod extends from the upper end of the pressure column, and an adjustable abutment block is installed on the lower pressure block at its top. When the sealing block is pressed down, the abutment block fixed on its side contacts and presses down the lower pressure block, thereby pushing the piston rod and piston block to move downward in the pressure column. This achieves the combination of the pressing action of the sealing block and the expansion of the annular rubber ring, thereby ensuring the timeliness and consistency of the seal establishment and further improving the sealing effect of the joint. Attached Figure Description

[0022] Figure 1 This is a first three-dimensional structural schematic diagram of the joint sealing tester in this application; Figure 2 This is a three-dimensional cross-sectional structural diagram of the joint sealing tester in this application; Figure 3 This application Figure 2 Enlarged view of point A in the middle; Figure 4This is a partial structural cross-sectional schematic diagram of the joint sealing state of the joint sealing tester in this application; Figure 5 This is a schematic diagram of the disassembled structure of the downward rotating cleaning mechanism in this application; Figure 6 This is a three-dimensional cross-sectional view of the auxiliary seal in this application; Figure 7 This application Figure 6 Enlarged diagram of point B in the middle.

[0023] Explanation of reference numerals in the attached figures: 1. Workbench; 2. Sealing chamber; 3. Sealing cover; 4. Sealing block; 5. Sealing seat; 6. Downward rotating cleaning mechanism; 61. Cleaning ring; 62. Cleaning rod; 63. Cleaning pad; 64. Rotating assembly; 641. Fixing screw; 642. Nut sleeve; 643. Toothed ring one; 644. Toothed ring two; 7. Expansion sealing mechanism; 71. Sealing rod; 72. Annular rubber ring; 73. Sealing corrugated ring; 74. Pressurizing assembly; 741. Pressurizing channel; 742. Pressurizing column; 743. Piston component; 7431. Piston block; 7432. Piston rod; 7433. Downward pressing block; 7434. Abutment block; 75. Positioning ring; 76. Support seat; 10. Vacuum pump; 11. Helium mass spectrometer leak detector; 12. Linear drive component; 15. Downward pressing tube; 16. Connector seat. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 —7 provides further details regarding this application.

[0025] This application discloses a joint sealing performance testing machine.

[0026] Reference Figure 1 , Figure 2 and Figure 3A joint sealing tester includes a workbench 1, a sealing chamber 2 fixed on the workbench 1, a sealing cover 3 hinged to the sealing chamber 2, a joint seat 16 disposed inside the sealing chamber 2, a through hole corresponding to the joint being provided on the joint seat 16, a sealing block 4 slidably connected inside the sealing chamber 2, a sealing seat 5 disposed at the bottom of the sealing chamber 2, a linear drive component 12 fixed at the top of the sealing chamber 2, a pressure tube 15 fixed to the telescopic end of the linear drive component 12, the pressure tube 15 penetrating the sealing chamber 2 and slidably connected to the sealing chamber 2, and one end of the pressure tube 15 near the sealing block 4 being connected to the sealing block. 4. Fixed connection: A through hole 2 corresponding to the pressure tube 15 is opened on the sealing block 4. A helium gas connector is fixed at the end of the pressure tube 15 away from the sealing block 4. A helium mass spectrometer leak detector 11 is installed on the workbench 1. A vacuum pump 10 is installed on the side of the workbench 1 near the helium mass spectrometer leak detector 11. The vacuum pump 10 is connected to the helium mass spectrometer leak detector 11 by a pipe. The helium mass spectrometer leak detector 11 is connected to the sealing chamber 2 by a pipe. A pressure rotation cleaning mechanism 6 is set between the sealing seat 5 and the sealing block 4 in the sealing chamber 2. A compression expansion sealing mechanism 7 is set on the sealing seat 5.

[0027] The operator inserts the connector to be tested into the through hole 1 of the connector seat 16, ensuring its lower end rests on the sealing seat 5. The sealing cover 3 is closed and locked, and the start button is pressed. The system operates according to the preset program. The vacuum pump 10 starts, and the helium mass spectrometer leak detector 11 evacuates the sealing chamber 2 to the detection vacuum level. The linear drive component 12 actuates, driving the pressure tube 15 and the sealing block 4 downwards. A sealing rubber ring is fixed inside the sealing block 4, forming an upper seal. Simultaneously, the bottom of the connector abuts against the sealing seat 5, which is a rubber pad that seals the bottom of the connector. Helium gas is injected into the sealed cavity of the connector through the channels in the pressure tube 15 and the sealing block 4. The helium mass spectrometer leak detector 11 detects whether there is helium molecule leakage inside the sealing chamber 2, thus determining the connector's sealing performance. At the same time, the sealing... The downward rotating cleaning mechanism 6 below block 4 automatically cleans the end face of the joint during the downward pressing of the sealing block 4. The compression expansion sealing mechanism 7 set on the sealing seat 5 operates synchronously to seal or press the joint from the bottom, forming a double-end seal. Helium is replenished and leak is detected in the vacuum sealing chamber 2. Then, the downward rotating cleaning mechanism 6 and the compression expansion sealing mechanism 7 are integrated to integrate multiple processes such as joint clamping, end face cleaning, double-end sealing, and helium filling detection into an automated process. This reduces the influence of a small amount of helium in the air and greatly improves the detection efficiency. More importantly, it eliminates the root cause of misjudgment caused by end face contamination and unrealistic single-end test conditions from a physical perspective, so that the helium test results can truly and accurately reflect the sealing performance of the joint body.

[0028] Reference Figure 3 , Figure 4 and Figure 5The downward rotating cleaning mechanism 6 includes a cleaning ring 61 disposed on the side of the sealing block 4 near the sealing seat 5. The cleaning ring 61 is rotatably connected to the sealing block 4. Several circumferentially distributed cleaning rods 62 are fixed on the inner wall of the cleaning ring 61. A cleaning pad 63 is fixed at the end of the cleaning rod 62 away from the cleaning ring 61. A rotating component 64 is disposed between the cleaning ring 61 and the sealing block 4.

[0029] The cleaning ring 61 is mounted on the bottom of the sealing block 4 via a bearing. Four to eight flexible cleaning rods 62 are evenly installed circumferentially on the inner wall of the cleaning ring 61. A soft polyurethane cleaning pad 63 is attached to the end of each cleaning rod 62. When the sealing block 4 is pressed down, the cleaning pad 63 first contacts the end face of the joint. Simultaneously, the pressing down of the sealing block 4 drives the rotating component 64, which in turn drives the cleaning ring 61 to rotate at the bottom of the sealing block 4. The rotation of the cleaning ring 61 drives the cleaning rods 62, which use the cleaning pad 63 to clean the end face of the joint. During continued pressing, the cleaning pad 63 is compressed and, supported by the cleaning rods 62, presses against the side of the joint, cleaning the side of the joint. Through the relatively rotatable cleaning ring 61 and the flexible cleaning pad 63, the key sealing surfaces of the joint are automatically physically cleaned before the seal is tightened, effectively removing dust, oil, and other contaminants. This fundamentally avoids the waste of expensive helium gas and false alarms caused by interface leakage.

[0030] Reference Figure 3 , Figure 4 and Figure 5 The rotating assembly 64 includes a fixing screw 641 fixed on the connector seat 16, a nut sleeve 642 threadedly connected to the fixing screw 641, the nut sleeve 642 being rotatably connected to the bottom surface of the sealing block 4, a toothed ring 643 fixed on the nut sleeve 642, a toothed ring 644 meshing with the toothed ring 643, and the inner wall of the toothed ring 644 being fixedly connected to the cleaning ring 61.

[0031] A fixed screw 641 with a trapezoidal thread is vertically fixed to the connector seat 16, and a matching nut sleeve 642 is screwed into it. The upper end of the nut sleeve 642 is rotatably connected to the bottom surface of the sealing block 4 through a bearing. The nut sleeve 642 has a gear machined on its outside as a gear ring 643, and the cleaning ring 61 has an internal gear ring machined on its inner wall as a gear ring 644. The two mesh. When the linear drive 12 drives the sealing block 4 to press down, the sealing block 4 applies a downward axial force to the nut sleeve 642 through the plane bearing. Since the fixed screw 641 is stationary, the nut sleeve 642... 42 is forced to rotate downward along the thread, converting linear motion into rotational motion, thereby driving the gear ring 643 to rotate. The gear ring 643 drives the gear ring 644 and the cleaning ring 61 fixed thereto to rotate, realizing the wiping action. By using the classic mechanical pair of fixing screw 641-nut sleeve 642, the single linear downward driving force of the sealing block 4 is deterministically converted into the rotational cleaning force of the cleaning ring 61 without the need for an additional power source, thus realizing a truly pure mechanical linkage, which allows the cleaning ring 61 to rotate during the descent of the sealing block 4.

[0032] Reference Figure 4 , Figure 6 and Figure 7 The compression expansion sealing mechanism 7 includes a support seat 76 fixed inside the sealing chamber 2, a sealing seat 5 fixed on the support seat 76, a connector seat 16 fixed on the support seat 76, a sealing rod 71 fixed on the sealing seat 5, the sealing rod 71 having a T-shaped cross section, a positioning ring 75 fixed on the sealing seat 5, the positioning ring 75 fitting the sealing rod 71 in the middle, an annular rubber ring 72 fitted on the sealing rod 71, sealing corrugated rings 73 fixedly connected to both sides of the annular rubber ring 72 and the sealing rod 71, and a pressure assembly 74 provided between the sealing rod 71 and the sealing block 4.

[0033] The sealing rod 71 is fixed on the support base 76, and its front end extends into the through hole in the center of the sealing base 5. The front end of the sealing rod 71 is fitted with an annular rubber ring 72. The T-shaped structure of the sealing rod 71 limits the position of the annular rubber ring 72. The two sides of the annular rubber ring 72 are fixed and sealed with the sealing rod 71 by a flexible sealing corrugated ring 73, forming an expandable sealed air chamber. During the placement of the joint, the end of the joint that abuts against the sealing base 5 is positioned between the annular rubber ring 72 and the positioning ring 75. During the pressing down of the sealing block 4, the sealing block 4 squeezes the pressurizing component 74, which inflates the sealed air chamber formed by the annular rubber ring 72 and the sealing corrugated ring 73, allowing the annular rubber ring 72 to abut against the inner wall of the joint to form a seal. By setting an expandable sealed air chamber composed of the annular rubber ring 72 and the sealing corrugated ring 73, radial sealing is achieved from the inside of the joint, which can complement the end face sealing of the joint, greatly expanding the types of joints and sealing forms that the testing machine can test.

[0034] Reference Figure 4 , Figure 6 and Figure 7 The pressurizing assembly 74 includes a pressurizing column 742 disposed on one side of the connector seat 16. The pressurizing column 742 is hollow with open ends. One end of the pressurizing column 742 is fixedly connected to the support seat 76. A pressurizing channel 741 is provided in the support seat 76. The pressurizing channel 741 connects the sealing rod 71 and the pressurizing column 742. A piston component 743 is disposed on the pressurizing column 742.

[0035] The pressure column 742 is a cylinder that is vertically fixed to the side of the connector seat 16. Its internal cavity is connected to the sealed air cavity at the front end of the sealing rod 71 through the slender channel machined in the support seat 76, forming a connected pneumatic system. By integrating the pressure transmission path inside the machine support structure, the entire pressure system is compact, has no exposed pipelines, is aesthetically pleasing and safe. At the same time, the closed channel ensures the cleanliness of the transmitted medium and improves the reliability and lifespan of the extrusion expansion sealing mechanism 7.

[0036] Reference Figure 4 , Figure 6 and Figure 7 The piston component 743 includes a piston block 7431 that is slidably connected within the pressure column 742. A piston rod 7432 is fixed on the piston block 7431. A lower pressure block 7433 is fixed on the piston rod 7432. An abutment block 7434 is provided on the lower pressure block 7433. The abutment block 7434 is fixedly connected to the sealing block 4.

[0037] The piston block 7431 is precisely slidably fitted with the inner wall of the pressure column 742. The piston rod 7432 extends from the upper end of the pressure column 742, and an adjustable abutment block 7434 is installed on the lower pressure block 7433 at its top. When the sealing block 4 is pressed down, the abutment block 7434 fixed on its side contacts and presses down the lower pressure block 7433, thereby pushing the piston rod 7432 and the piston block 7431 to move downward in the pressure column 742, squeezing the air inside. The squeezed medium enters the sealed air chamber at the front end of the sealing rod 71 through the pressurization channel 741, pushing the annular rubber ring 72 to expand outward and tightly fit against the inner wall of the joint to achieve a seal. Through the direct mechanical contact between the abutment block 7434 and the lower pressure block 7433, the pressing action of the sealing block 4 is combined with the expansion of the annular rubber ring 72, thereby ensuring the timeliness and consistency of the seal establishment and further improving the sealing effect of the joint.

[0038] Working principle: The operator inserts the connector to be tested into the through hole 1 of the connector seat 16, so that its lower end rests on the rubber sealing seat 5. Then, the sealing cover 3 is closed and the sealing cover 3 is tightly locked to the sealing chamber 2. After pressing the start button, the vacuum pump 10 is started, and the entire sealing chamber 2 is evacuated to the vacuum level required for testing by the helium mass spectrometer leak detector 11.

[0039] Next, the linear drive 12 starts to move, driving the pressure tube 15 and the sealing block 4 fixed thereto to move downward. In the initial stage of pressing down, the cleaning ring 61 at the bottom of the sealing block 4 first contacts the end face of the connector through the cleaning pad 63 at the end of its flexible cleaning rod 62. As the sealing block 4 continues to press down, the rotating component 64 between the cleaning ring 61 and the bottom surface of the sealing block 4 starts to work. The fixing screw 641, which is vertically fixed on the connector seat 16, remains stationary. The nut sleeve 642, which is rotatably connected to the bottom surface of the sealing block 4, is forced to rotate downward along the thread of the fixing screw 641 under axial pressure. The rotation of the nut sleeve 642 is transmitted to the toothed ring 644 fixed to the cleaning ring 61 through the toothed ring 643 on it, thereby driving the entire cleaning ring 61 and its cleaning rod 62 and cleaning pad 63 to rotate, completing the wiping and cleaning of the end face and sides of the connector.

[0040] After the cleaning ring 61 completes cleaning and is pressed down to its limit position along with the sealing block 4, the sealing ring inside the sealing block 4 tightly presses against the top of the joint, forming a reliable upper seal. At the same time, the abutment block 7434 on the side of the sealing block 4 contacts and presses down the pressing block 7433 on the top of the piston rod 7432 during the descent, pushing the piston rod 7432 and piston block 7431 downward within the pressure column 742, compressing the air inside. The compressed air enters through the pressure channel 741 in the support seat 76 and passes through the annular rubber ring 72 at the front end of the sealing rod 71 and the sealing corrugated rings 73 on both sides. The enclosed air chamber forces the annular rubber ring 72 to expand outward and tightly fit the inner wall of the lower end of the joint, forming an auxiliary seal from the inside. At this time, the joint is completely sealed in the sealed test chamber formed by the upper end face of the sealing block 4, the lower end face of the sealing seat 5 and the internally expanded annular rubber ring 72. Helium gas is then injected into the internal cavity of the joint through the pressure pipe 15 and the channel in the sealing block 4. The helium mass spectrometer leak detector 11 continuously monitors the gas composition in the sealed chamber 2. If there is a leak in the joint, helium molecules will penetrate into the sealed chamber 2 and be accurately detected by the leak detector, thereby determining whether the joint is qualified for sealing.

Claims

1. A joint sealing performance testing machine, comprising a workbench (1), characterized in that: A sealing chamber (2) is fixed on the workbench (1). A sealing cover (3) is hinged to the sealing chamber (2). A connector seat (16) is provided inside the sealing chamber (2). A through hole corresponding to the connector is opened on the connector seat (16). A sealing block (4) is slidably connected inside the sealing chamber (2). A sealing seat (5) is provided at the bottom of the sealing chamber (2). A linear drive component (12) is fixed to the top of the sealing chamber (2). A pressure tube (15) is fixed to the telescopic end of the linear drive component (12). The pressure tube (15) penetrates the sealing chamber (2) and is slidably connected to the sealing chamber (2). One end of the pressure tube (15) is fixedly connected to the sealing block (4). The sealing block (4) has a through hole 2 corresponding to the pressure tube (15). The end of the pressure tube (15) away from the sealing block (4) is fixed with a helium connector. A helium mass spectrometer leak detector (11) is installed on the workbench (1). A vacuum pump (10) is installed on the side of the workbench (1) close to the helium mass spectrometer leak detector (11). The vacuum pump (10) is connected to the helium mass spectrometer leak detector (11) by a pipe. The helium mass spectrometer leak detector (11) is connected to the sealing chamber (2) by a pipe. A pressure rotation cleaning mechanism (6) is provided between the sealing seat (5) and the sealing block (4) in the sealing chamber (2). A compression expansion sealing mechanism (7) is provided on the sealing seat (5).

2. The joint sealing performance testing machine according to claim 1, characterized in that: The downward rotating cleaning mechanism (6) includes a cleaning ring (61) disposed on the side of the sealing block (4) near the sealing seat (5). The cleaning ring (61) is rotatably connected to the sealing block (4). A number of circumferentially distributed cleaning rods (62) are fixed on the inner wall of the cleaning ring (61). A cleaning pad (63) is fixed at the end of the cleaning rod (62) away from the cleaning ring (61). A rotating assembly (64) is disposed between the cleaning ring (61) and the sealing block (4).

3. The joint sealing performance testing machine according to claim 2, characterized in that: The rotating assembly (64) includes a fixing screw (641) fixed on the connector seat (16), a nut sleeve (642) threadedly connected to the fixing screw (641), the nut sleeve (642) being rotatably connected to the bottom surface of the sealing block (4), a toothed ring one (643) fixed on the nut sleeve (642), a toothed ring two (644) meshing on the toothed ring one (643), and the inner wall of the toothed ring two (644) being fixedly connected to the cleaning ring (61).

4. The joint sealing performance testing machine according to claim 1, characterized in that: The compression expansion sealing mechanism (7) includes a support seat (76) fixed inside the sealing chamber (2), a sealing seat (5) fixed on the support seat (76), a connector seat (16) fixed on the support seat (76), a sealing rod (71) fixed on the sealing seat (5), the sealing rod (71) having a T-shaped cross section, a positioning ring (75) fixed on the sealing seat (5), the positioning ring (75) fitting the sealing rod (71) in the middle, an annular rubber ring (72) fitted on the sealing rod (71), a sealing corrugated ring (73) fixedly connected to both sides of the annular rubber ring (72) and the sealing rod (71), and a pressure assembly (74) provided between the sealing rod (71) and the sealing block (4).

5. The joint sealing performance testing machine according to claim 4, characterized in that: The pressurizing assembly (74) includes a pressurizing column (742) disposed on one side of the connector seat (16). The pressurizing column (742) is hollow with open ends. One end of the pressurizing column (742) is fixedly connected to the support seat (76). A pressurizing channel (741) is provided in the support seat (76). The pressurizing channel (741) connects the sealing rod (71) and the pressurizing column (742). A piston component (743) is provided on the pressurizing column (742).

6. The joint sealing performance testing machine according to claim 5, characterized in that: The piston component (743) includes a piston block (7431) slidably connected within the pressure column (742), a piston rod (7432) fixed on the piston block (7431), a lower pressure block (7433) fixed on the piston rod (7432), an abutment block (7434) provided on the lower pressure block (7433), and the abutment block (7434) fixedly connected to the sealing block (4).

Images