A valve core leakage detector

Abstract

This invention provides a valve core leakage detection tool, belonging to the technical field of valves. The valve core leakage detection tool includes a valve core grinding assembly and a pressure detection assembly. This invention installs the valve sleeve on a lifting platform within the valve core grinding assembly, places the valve core inside the valve sleeve, and connects the lifting platform to a lifting actuator. This allows the relative position of the valve core and valve sleeve to be adjusted when the lifting actuator moves the lifting platform up and down, ensuring that the sealing surfaces or sealing lines of the valve core and valve sleeve are completely aligned. The adjusted valve sleeve and valve core are then transferred as a whole to the pressure detection assembly for sealing and leakage testing. This eliminates false detections caused by non-product quality factors such as improper assembly of the sealing line or sealing surface before testing, thus ensuring the accuracy of the test results.

Description

Technical Field

[0001] This invention relates to the technical field of valves, and more specifically to a leakage detection tool for valve cores. Background Technology

[0002] Valves, as commonly used structural components in pipeline systems, enable the control of pipeline opening and closing, as well as the adjustment of the opening and closing cross-section. They typically consist of a valve sleeve and a valve core. The valve sleeve has a valve cavity with a sealing surface or sealing line. The valve core slides within the valve cavity and has a matching sealing surface or sealing line. When the valve core slides, the sealing surface or sealing line of the two contacts or separates to cut off or open the passage, thereby meeting the usage requirements. Therefore, the sealing performance of the valve core directly determines the performance of the valve. During manufacturing, the industry needs to test the valve core for leakage.

[0003] Currently, the industry typically uses pneumatic testing to detect valve core leakage. This involves setting up a base, mounting the valve sleeve and valve core to be tested on the base, moving the valve core to the closed position, inflating the valve core end with external equipment, and maintaining the pressure for a period of time. The pressure change before and after the pressure holding period is then measured using a pressure testing instrument. If there is no pressure change or the pressure change is within the allowable range, the valve core is considered to have good sealing performance, and its leakage meets design requirements. If the pressure change is significant and exceeds the allowable range, the valve core is considered to have poor sealing performance, with excessive leakage, and does not meet design requirements. While this method can meet the requirements for valve core leakage detection, there are situations where the valve core is not installed properly, resulting in the sealing surfaces or sealing lines of the valve core and valve sleeve not completely aligning. In such cases, pneumatic testing can easily detect leakage problems not caused by the valve core's structure itself, leading to false detections and affecting the accuracy of the test results. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention aims to provide a valve core leakage detection tool. This tool uses a valve core grinding assembly to adjust the valve core before pressure testing, ensuring complete overlap of the sealing surfaces or sealing lines of the valve sleeve and valve core. The adjusted valve core and valve sleeve are then transferred to a base for inflation testing. This allows for the assessment of valve core quality and detection of leakage, avoiding false detections due to improper valve core installation and improving the accuracy of the test results.

[0005] The specific technical solution is as follows: A leakage detector for a valve core, characterized by the following features: The valve core grinding assembly includes a lifting platform and a lifting driver. The lifting platform moves vertically and is connected to the lifting driver. The lifting platform is provided with several detection holes. The valve sleeve is placed in the detection holes and the valve core is installed in the valve sleeve. The air pressure detection assembly includes a base, an air inlet connector, and an air outlet connector. The base has a detection hole and an air outlet connector that communicates with the bottom of the detection hole. A valve sleeve is installed inside the detection hole. The air inlet connector is connected to the valve core and the air supply equipment. Both the air inlet connector and the air outlet connector are connected to the pressure gauge.

[0006] The aforementioned valve core leakage inspection tool includes a valve core grinding assembly that also includes a gland. The gland is disassembled and installed on a lifting platform. After the valve core and valve sleeve to be adjusted are installed on the lifting platform, the gland presses against the outer edge of the valve sleeve, and a gap is provided between the gland and the valve core.

[0007] In the aforementioned valve core leakage detector, a clamping member is provided on the base and next to the detection hole, with one end of the clamping member extending to the opening of the detection hole.

[0008] The aforementioned leakage detector for a valve core includes a lifting drive comprising a lifting bracket, a drive motor, a swing arm, a connecting rod, and a lifting seat. The lifting bracket comprises a base and a vertical frame. The vertical frame is arranged vertically and its bottom end is fixed to the base. The upper end of the vertical frame is equipped with a drive motor, and a swing arm is mounted on the drive shaft of the drive motor. One end of the connecting rod is hinged to the swing arm at a predetermined distance from the drive shaft of the drive motor. The lifting seat is slidably mounted on the vertical frame, and a lifting platform is mounted on the lifting seat. The end of the connecting rod facing away from the swing arm is hinged to the lifting seat.

[0009] In the aforementioned valve core leakage detector, the lifting drive further includes a guide assembly, which is disposed between the upright and the lifting seat. The guide assembly includes a guide rail and a guide slider. The guide rail is fixed on the upright, the guide slider is slidably disposed on the guide rail, and the lifting seat is mounted on the guide slider.

[0010] In the aforementioned leakage detector for a valve core, the middle part of the swing arm is connected to the drive shaft of the drive motor, and the weight of the end of the swing arm away from the end connected to the connecting rod is greater than the weight of the end connected to the connecting rod.

[0011] The aforementioned leakage detector for valve core includes a slot on the lifting base and a locking foot on one side of the lifting platform. When the lifting platform is installed on the lifting base, the locking foot engages with the slot.

[0012] The aforementioned leakage detector for a valve core further includes a transfer fixing component, which is detachably installed outside the valve sleeve. The transfer fixing component includes a clamp, a clamping arm, a torsion spring, and a pressure block. The clamp is a "C"-shaped structure with an opening. An extended mounting seat is provided on the outer side of the clamp. A clamping arm is rotatably mounted on the mounting seat, and one end of the clamping arm extends to the inner side of the clamp. A pressure block is provided on the end of the clamping arm that extends to the inner side of the clamp. A torsion spring is provided between the clamping arm and the mounting seat.

[0013] In the aforementioned valve core leakage detection tool, the end of the clamping arm away from the clamp extends upward at an angle. A clearance hole is provided on the bottom surface of the pressure cover. When the valve sleeve is installed in the detection hole on the lifting platform, the upper end of the valve sleeve extends into the clearance hole. Furthermore, a step is provided in the clearance hole to press down on the upper end of the valve sleeve. A clearance groove is provided on the bottom surface of the pressure cover and communicates with the corresponding clearance hole. When the transfer fixing component is installed on the valve cover, the clamp of the transfer fixing component is located in the clearance hole. The clamping arm, torsion spring, and mounting seat are all located in the clearance groove. When the bottom surface of the pressure cover is not tightly attached to the lifting platform, the end of the clamping arm away from the clamp contacts the bottom of the clearance groove. When the pressure cover is pressed tightly against the lifting platform, the end of the clamping arm away from the clamp is pressed down, and the end of the clamping arm extending towards the inside of the clamp tilts upward. After the pressure cover is released, the end of the clamping arm extending to the inside of the clamp presses down to press down and hold the valve core in the valve sleeve.

[0014] The aforementioned leakage detector for a valve core includes an automatic retraction assembly further comprising a transfer fixing component. This assembly is disposed between the mounting base and the clamping arm. The automatic retraction assembly includes a slide, a push spring, a limit spring, and an unlocking push plate. The slide is slidably mounted on the mounting base and reciprocates in a direction moving away from or towards the clamp. The clamping arm is rotatably mounted on the slide, with one end of the clamping arm's torsion spring abutting against the slide. The mounting base has a placement groove along the radial direction of the clamp, and a push spring is disposed within the placement groove. One end of the push spring abuts against the slide, and the other end abuts against the placement groove. Near the end of the groove close to the clamp, a limiting spring is installed on the mounting base, with one end of the limiting spring protruding towards the slide. After the limiting spring protrudes, it locks the slide. A receiving hole is provided on the mounting base at the bottom of the limiting spring. When pressed, the end of the limiting spring protruding towards the slide retracts into the receiving hole. The slide passes over the limiting spring. An unlocking push plate is provided at the bottom of the end of the clamping arm that extends upward. After the end of the clamping arm with the unlocking push plate deflects downward to a predetermined angle, the unlocking push plate contacts the protruding end of the limiting spring. If the clamping arm is pressed down further, the unlocking push plate presses the limiting spring into the receiving hole.

[0015] The positive effects of the above technical solution are: The aforementioned valve core leakage detector, by setting up a valve core grinding assembly including a lifting platform and a lifting actuator, and a pneumatic testing assembly including a base, an inlet connector, and an outlet connector, allows for the installation of the valve core and valve sleeve onto the lifting platform before pneumatic testing. The lifting actuator then drives the lifting platform to move up and down, adjusting the valve core's position within the valve sleeve to ensure complete overlap of the sealing surfaces or sealing lines. The adjusted valve core and valve sleeve are then transferred to the pneumatic testing assembly for pneumatic testing, thereby enabling the detection of the valve core's sealing performance and leakage, meeting testing requirements, effectively eliminating false detections caused by improper assembly of the sealing surfaces or sealing lines, excluding the influence of non-product quality factors, and ensuring the accuracy of the test results. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the valve core grinding assembly of a valve core leakage detector according to the present invention; Figure 2 This is a schematic diagram of the structure of the valve core leakage detector of the present invention after the gland is flipped up and down; Figure 3 This is a structural diagram of a transfer fixing component for a valve core leakage detector according to the present invention; Figure 4 This is a schematic diagram of the installation of the clamp, mounting base, and limiting spring of the transfer fixing component of a valve core leakage detector according to the present invention; Figure 5 This is a schematic diagram of the installation of the slide, clamping arm, pressure block, and unlocking push plate of the transfer fixing component of a valve core leakage detector according to the present invention.

[0017] In the attached diagram: 1. Valve core grinding assembly; 11. Lifting platform; 12. Lifting driver; 13. Pressure cap; 111. Clamping foot; 121. Lifting bracket; 122. Drive motor; 123. Swing arm; 124. Connecting rod; 125. Lifting seat; 126. Guide assembly; 131. Clearance hole; 132. Clearance groove; 1211. Base; 1212. Stand; 1251. Slot; 1261. Guide slide rail; 1262. Guide slider; 2. Transfer fixing component; 21. Clamp; 22. Pressing arm; 23. Pressing block; 24. Mounting seat; 25. Automatic retraction assembly; 241. Placement groove; 242. Receiving hole; 251. Slide table; 252. Push spring; 253. Limiting spring; 254. Unlocking push plate. Detailed Implementation

[0018] To make the technical means, creative features, objectives, and effects of this invention easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 5 The technical solutions provided by this invention are described in detail, but the following content is not intended to limit this invention.

[0019] Figure 1 This is a structural diagram of the valve core grinding assembly of a valve core leakage detector according to the present invention; Figure 3 This is a structural diagram of a transfer fixing component for a valve core leakage detection tool according to the present invention. Figure 1 and Figure 3 As shown, the valve core leakage detection tool provided in this embodiment includes: valve core grinding assembly 1, air pressure detection assembly and transfer fixing component 2.

[0020] Specifically, the valve core grinding assembly 1 includes a lifting platform 11 and a lifting actuator 12. The lifting platform 11 moves vertically up and down, generating vibrations to allow the movable valve core to be continuously vibrated and adjusted within the valve sleeve. The lifting platform 11 is connected to the lifting actuator 12. The lifting platform 11 has several detection holes. The valve sleeve is placed in one of these holes, and the valve core is installed within the valve sleeve. The lifting actuator 12 provides power for the lifting platform 11's movement. After the valve sleeve is installed on the lifting platform 11, the valve core is installed within the valve sleeve. Then, the lifting actuator 12 is activated, causing the lifting platform 11 to move vertically up and down, vibrating and changing the position of the valve core within the valve sleeve. This ensures that the sealing surfaces or sealing lines of the valve sleeve and valve core completely overlap, reducing false detections due to improper installation during subsequent air pressure testing.

[0021] Specifically, the air pressure detection component includes a base, an inlet connector, and an outlet connector. The base has a detection hole, and the outlet connector is connected to the bottom of the detection hole, allowing gas in the detection hole to escape through the outlet connector, providing conditions for subsequent pressure testing. At this time, the valve sleeve is installed in the detection hole, the inlet connector is connected to the valve core, and the inlet connector is connected to the air supply equipment. Both the inlet and outlet connectors are connected to the pressure gauge. During testing, the valve sleeve with the valve core is installed in the detection hole, and then the inlet connector is connected to the valve core. The air supply equipment is then activated to supply air to the valve core. The pressure change on both sides of the valve core is observed through the pressure gauge to determine the sealing performance of the valve core, thus meeting the testing requirements. Preferably, a gas flow meter can also be installed in the pipeline of the inlet connector and the outlet structure to measure the flow rate, thereby detecting the leakage of the valve core and meeting the testing requirements of different indicators. It is worth noting that different instruments are required to detect different indicators. Therefore, this embodiment only lists two indicators: pressure change and leakage. However, it is not limited to other similar indicators, which will not be elaborated upon here. Furthermore, there are many devices on the market for testing the airtightness of the overall structure of the valve core and valve sleeve, and using pneumatic testing is a common industry practice. Therefore, the pneumatic testing component in this embodiment can also be a commercially available device. Thus, the specific structure of the pneumatic testing component includes, but is not limited to, the structure described above.

[0022] Figure 2 This is a schematic diagram of the structure of a valve core leakage detector according to the present invention after the gland is flipped up and down. Figure 1 and Figure 2 As shown, the valve core grinding assembly 1 also includes a pressure cap 13, which is detachably mounted on the lifting platform 11, allowing it to be removed for easy loading and unloading of the valve core and valve sleeve. Furthermore, after the valve core and valve sleeve to be adjusted are mounted on the lifting platform 11, the pressure cap 13 presses against the outer edge of the valve sleeve, with a gap between the pressure cap 13 and the valve core. This ensures that after the pressure cap 13 is mounted on the lifting platform 11, it stably limits the valve sleeve, while the valve core can move within the valve sleeve. This relative movement between the valve core and valve sleeve allows the sealing surfaces or sealing lines of the valve core and valve sleeve to be adjusted to a state of complete overlap during continuous movement, providing conditions for accurate subsequent leakage detection.

[0023] More specifically, a clamping element is installed on the base next to the detection hole. One end of the clamping element extends to the opening of the detection hole, allowing the outer edge of the valve sleeve to be pressed down by the end of the clamping element after the valve sleeve is placed in the detection hole, thus achieving positioning during detection and improving detection reliability. It is worth noting that the clamping element is a pressure foot, which slides radially on the base along the detection hole, allowing its end to extend into or retract from the detection hole, facilitating the loading and unloading of the valve sleeve. At this time, a strip-shaped sliding hole is opened at the end of the pressure foot away from the detection hole. A screw passes through the strip-shaped sliding hole and is fixed to the base, allowing the pressure foot to be fixed or released by tightening or loosening the screw, thus meeting the requirements for the pressure foot to move on the base and for the valve sleeve to be stably pressed down. In addition, each pressure foot has an extended pressure head at the top of the end near the detection hole, so that the bottom of the pressure head is a hollow structure, which provides space for the edge of the valve sleeve and the clamp 21 of the subsequent transfer fixing component 2.

[0024] More specifically, the lifting drive 12 includes a lifting bracket 121, a drive motor 122, a swing arm 123, a connecting rod 124, and a lifting seat 125. The lifting bracket 121 includes a base 1211 and a vertical frame 1212. The vertical frame 1212 is arranged vertically and its bottom end is fixed to the base 1211, which better accommodates the vertical lifting movement of the lifting platform 11. Furthermore, the drive motor 122 is installed at the upper end of the vertical frame 1212, and the swing arm 123 is installed on the drive shaft of the drive motor 122, so that the rotation of the drive motor 122 can drive the swing arm 123 to rotate. Furthermore, a connecting rod 124 is hinged to one end of the swing arm 123 at a predetermined distance from the drive shaft of the drive motor 122. This makes the connecting rod 124 eccentrically arranged relative to the rotation center of the swing arm 123. This allows the connecting rod 124 to swing when the swing arm 123 is driven by the drive motor 122, providing the conditions for subsequently raising and lowering the lifting platform 11. Additionally, the lifting base 125 is slidably mounted on the upright frame 1212 in the vertical direction, and the lifting platform 11 is mounted on the lifting base 125, thus providing the mounting foundation for the lifting platform 11. Furthermore, the end of the connecting rod 124 facing away from the swing arm 123 is hinged to the lifting seat 125. Since the lifting seat 125 is only allowed to move in the vertical direction, when the swing arm 123 is rotated by the drive motor 122, the connecting rod 124 can adapt by yaw and up-down movement, thereby pulling the lifting seat 125 to move up and down in the vertical direction to meet the relative position adjustment requirements of the valve core and valve sleeve. It is worth noting that during adjustment, the operator can control the number of times the lifting seat 125 rises and falls by setting the number of rotations of the drive motor 122, making control more convenient.

[0025] More specifically, the lifting drive 12 also includes a guide assembly 126. The guide assembly 126 is positioned between the upright 1212 and the lifting seat 125. As an intermediate structure for the sliding mounting of the lifting seat 125 onto the upright 1212, the guide assembly 126 ensures that the lifting seat 125 moves vertically. The guide assembly 126 includes a guide rail 1261 and a guide slider 1262. The guide rail 1261 is fixed to the upright 1212, and the guide slider 1262 is slidably mounted on the guide rail 1261. The lifting seat 125 is mounted on the guide slider 1262, providing a stable and reliable guide for the lifting of the lifting seat 125.

[0026] More specifically, the middle part of the swing arm 123 is connected to the drive shaft of the drive motor 122, so that both ends of the swing arm 123 can extend beyond the drive shaft of the drive motor 122, ensuring that the connecting rod 124 can be eccentrically connected. In addition, the weight of the end of the swing arm 123 away from the connecting rod 124 is greater than the weight of the end connected to the connecting rod 124, making the end of the swing arm 123 heavier than the end connected to the connecting rod 124. This results in greater inertia when the swing arm 123 rotates, thereby pulling the connecting rod 124 to move up and down smoothly, making the structural design more reasonable.

[0027] More specifically, a slot 1251 is provided on the lifting base 125, and a locking foot 111 is provided on one side of the lifting platform 11. When the lifting platform 11 is installed on the lifting base 125, the locking foot 111 is locked into the slot 1251, which realizes the disassembly and installation of the lifting platform 11 on the lifting base 125. This improves the structural flexibility, so that when different models of valve sleeves and valve cores need to be tested, only the corresponding lifting platform 11 needs to be replaced, without the need to replace the entire lifting drive 12, thus reducing costs.

[0028] Figure 3 This is a structural diagram of a transfer fixing component for a valve core leakage detection tool according to the present invention. Figure 1 and Figure 3As shown, it also includes a transfer fixing component 2. The transfer fixing component 2 is detached and installed outside the valve sleeve. That is, when transferring and adjusting the valve sleeve and valve core to the air pressure detection assembly, the transfer fixing component 2 can stabilize the valve core inside the valve sleeve, preventing relative movement between the valve sleeve and valve core, whose sealing surfaces or sealing lines are completely aligned after adjustment, during the transfer process, which could lead to adjustment failure and ensure the accuracy of the test results. At this time, the transfer fixing component 2 includes a clamp 21, a clamping arm 22, a torsion spring, and a pressure block 23. The clamp 21 is a "C"-shaped structure with an opening. Under the action of external force, the clamp 21 can be inserted into or removed from the outer sealing groove of the valve sleeve through the opening, thus realizing the installation of the transfer fixing component 2 on the valve sleeve. At this time, an extended mounting base 24 is provided on the outer side of the clamp 21. A clamping arm 22 is rotatably mounted on the mounting base 24, and one end of the clamping arm 22 extends into the inner side of the clamp 21. This allows the distance between the end of the clamping arm 22 extending into the inner side of the clamp 21 and the clamp 21 to be adjusted when the clamping arm 22 swings. That is, when the clamp 21 is installed on the valve sleeve, one end of the clamping arm 22 can extend into the inner side of the valve sleeve, thereby corresponding to the valve core inside the valve sleeve. This provides the conditions for the clamping arm 22 to press the valve core into the valve sleeve. In addition, a pressure block 23 is provided on the end of the clamping arm 22 extending into the inner side of the clamp 21. Preferably, the pressure block 23 is made of rubber, so that the clamping arm 22 can contact the valve core through the pressure block 23, preventing damage to the valve core and providing better protection. In addition, a torsion spring is provided between the clamping arm 22 and the mounting base 24. The two ends of the torsion spring are connected to the clamping arm 22 and the mounting base 24 respectively. The torsion spring provides pressure to the clamping arm 22 to ensure that the valve core can be pressed into the valve sleeve during the transfer process, maintain the stability of the adjusted valve core and valve sleeve position, and thus ensure the accuracy of the test results.

[0029] Figure 4 This is a schematic diagram of the installation of the clamp, mounting base, and limiting spring of the transfer fixing component of a valve core leakage detector according to the present invention; Figure 5 This is a schematic diagram illustrating the installation of the slide, clamping arm, pressure block, and unlocking push plate of the transfer fixing component of a valve core leakage detector according to the present invention. Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the end of the clamping arm 22 facing away from the clamp 21 extends upward at an angle. This allows the end of the clamping arm 22 with the pressure block 23 to tilt upward when the clamping arm 22 is pressed down, thus moving away from the valve core. This ensures that the valve core can vibrate freely during the adjustment process, meeting the valve core position adjustment requirements. Additionally, a clearance hole 131 is provided on the bottom surface of the pressure cap 13. When the valve sleeve is installed in the detection hole on the lifting platform 11, the upper end of the valve sleeve extends into the clearance hole 131. Furthermore, a step is provided in the clearance hole 131 to press down on the upper end of the valve sleeve, fulfilling the requirement that the valve sleeve be pressed tightly by the pressure cap 13. In addition, a clearance groove 132 is provided on the bottom surface of the pressure cap 13 and communicates with the corresponding clearance hole 131. When the transfer fixing component 2 is installed on the valve cover, the clamp 21 of the transfer fixing component 2 is located in the clearance hole 131, and the clamping arm 22, torsion spring, and mounting base 24 are all located in the clearance groove 132, realizing the concealed installation of the transfer fixing component 2. Furthermore, when the bottom surface of the pressure cap 13 is not in close contact with the lifting platform 11, the end of the clamping arm 22 away from the clamp 21 contacts the bottom of the clearance groove 132. When the pressure cap 13 is pressed down and pressed against the lifting platform 11, the end of the clamping arm 22 away from the clamp 21 is pressed down, causing the end of the clamping arm 22 extending towards the inside of the clamp 21 to tilt upward, thereby causing the pressure block 23 to move away from the valve core inside the valve sleeve, allowing the valve core to vibrate freely and adjust its position to meet the adjustment requirements. After the position adjustment is completed, the external pressure of the pressure cap 13 on the clamping arm 22 is reduced after the pressure cap 13 is released. This causes the clamping arm 22 to automatically reset under the action of the torsion spring. As a result, the end of the clamping arm 22 extending to the inside of the clamp 21 presses down to hold the valve core inside the valve sleeve, thus temporarily positioning the valve core inside the valve sleeve. When the valve core and valve sleeve are subsequently transferred as a whole, they can be transferred synchronously with the transfer fixing part 2, maintaining the relative position stability of the valve sleeve and valve core during the transfer process, thereby ensuring the accuracy of the results during subsequent air pressure testing. It is worth noting that after the test is completed, the transfer fixing part 2 can be disassembled simply by pulling the clamp 21 in the opposite direction with external force to disengage it from the outer sealing groove of the valve sleeve, making it more convenient to use. It is worth noting that the pressure cap 13 and the lifting platform 11 are preferably connected by bolts, that is, the pressure cap 13 is provided with a locking hole, and the lifting platform 11 is provided with a threaded hole corresponding to the locking hole, so that the bolt can pass through the locking hole and be threadedly connected to the threaded hole. This allows the tester to disassemble and assemble the pressure cap 13 and tighten or loosen it after installation by turning the bolt, thus meeting the testing requirements.

[0030] More specifically, the transfer fixing component 2 also includes an automatic retraction assembly 25, which is disposed between the mounting base 24 and the clamping arm 22. This allows the end of the clamping arm 22 that presses against the valve core to automatically move away from the valve core during air pressure testing, facilitating the connection between the air inlet connector and the valve core. The automatic retraction assembly 25 includes a slide 251, a push spring 252, a limiting spring 253, and an unlocking push plate 254. The slide 251 is slidably disposed on the mounting base 24 and reciprocates in the direction of moving away from or towards the clamp 21. The clamping arm 22 is rotatably mounted on the slide 251, and one end of the torsion spring of the clamping arm 22 abuts against the slide 251. This allows the clamping arm 22 to meet its own deflection requirements while also moving closer to or away from the clamp 21 along with the slide 251, thereby fulfilling the requirement for the pressure block 23 to extend into or move out of the clamp 21. In addition, the mounting base 24 has a placement groove 241 along the radial direction of the clamp 21. A push spring 252 is provided in the placement groove 241, with one end of the push spring 252 abutting against the slide table 251 and the other end of the push spring 252 abutting against the end of the placement groove 241 near the clamp 21. This allows the push spring 252 to push the slide table 251 away from the clamp 21 when the slide table 251 is not restricted, thus providing a condition for the slide table 251 to drive the pressure block 23 to automatically move out from the inside of the clamp 21. In addition, a limiting spring 253 is installed on the mounting base 24, with one end of the limiting spring 253 protruding towards the slide table 251. This allows the limiting spring 253 to protrude and lock the slide table 251 when the slide table 251 slides to the end of the limiting spring 253 that is close to the clamp 21. This prevents the slide table 251 from moving away from the clamp 21 under the action of the push spring 252, thus maintaining the use state of the pressure block 23 inside the clamp 21. Meanwhile, a receiving hole 242 is provided on the mounting base 24 and at the bottom of the limiting spring 253, so that the end of the limiting spring 253 protruding toward the slide 251 can be retracted into the receiving hole 242 when pressed, thereby allowing the slide 251 to pass over the limiting spring 253, so that the limiting spring 253 releases the restriction on the slide 251, so that the slide 251 can be pushed away from the clamp 21 by the push spring 252, so that the pressure block 23 moves out from the inside of the clamp 21, thereby ensuring that the connection between the air inlet connector and the valve core is not affected by the clamping arm 22 and the pressure block 23.Additionally, an unlocking push plate 254 is provided at the bottom of the upward-sloping end of the clamping arm 22. This allows the unlocking push plate 254 to contact the protruding end of the limiting spring 253 after the end of the clamping arm 22 with the unlocking push plate 254 is deflected downward to a predetermined angle. If the clamping arm 22 is pressed down further, the limiting spring 253 can be pressed into the receiving hole 242 by the unlocking push plate 254. This allows the slider to automatically move away from the clamp 21. That is, when the clamping block 23 is released from the valve core by pressing the clamping arm 22, if the clamping arm 22 is pressed down further, the limiting spring 253 will be lowered by the unlocking push plate 254. This releases the limiting spring 253 from the slide 251, allowing the slide 251 to slide automatically away from the clamp 21 under the action of the push spring 252. This allows the clamping block 23 to automatically move away from the inside of the clamp 21, thus facilitating the connection between the air intake connector and the valve core. It is worth noting that when the slide 251 slides away from the clamp 21, the bottom of the slide 251 continuously presses against the limiting spring 253, preventing the slide 251 from completely passing over the limiting spring 253 and thus blocking its movement towards the clamp 21. This provides conditions for the reuse of the transfer fixing part 2. Furthermore, it is worth noting that when the end of the clamping arm 22 is initially pressed down a predetermined distance at its upward-sloping extension, the unlocking push plate 254 does not contact the limiting spring 253. At this time, only the pressure block 23 releases the valve core, while the slide 251 does not move away from the clamp 21. This satisfies the requirement for automatic valve core position adjustment and provides conditions for pressing the valve core into the valve sleeve during subsequent overall transfer of the valve core and valve sleeve. In this state, only by continuing to press down the clamping arm 22 can the unlocking push plate 254 contact the limiting spring 253. Only after the unlocking push plate 254 presses down the limiting spring 253 during the process of continuing to press down the clamping arm 22 can the restriction on the slide table 251 be released, thus providing conditions for subsequent air pressure detection of the valve core.

[0031] The valve core leakage detection tool provided in this embodiment includes a valve core grinding assembly 1, a pneumatic pressure detection assembly, and a transfer fixing component 2. By installing the valve sleeve on the lifting platform 11 in the valve core grinding assembly 1 and placing the valve core inside the valve sleeve, and connecting the lifting platform 11 to the lifting driver 12, the relative position of the valve core and the valve sleeve can be adjusted when the lifting driver 12 drives the lifting platform 11 to rise and fall. This ensures that the sealing surface or sealing line of the valve core and the valve sleeve can be completely overlapped. After the adjustment, the valve sleeve and the valve core are transferred as a whole to the pneumatic pressure detection assembly for sealing and leakage detection. This eliminates the problem of false detection caused by non-product quality factors such as the sealing line or sealing surface not being assembled properly before the test, thereby ensuring the accuracy of the test results.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A leakage detector for a valve core, characterized in that, include: A valve core grinding assembly includes a lifting platform and a lifting driver. The lifting platform moves vertically and is connected to the lifting driver. The lifting platform is provided with several detection holes. A valve sleeve is placed in the detection holes, and a valve core is installed inside the valve sleeve. A pressure detection assembly includes a base, an air inlet connector, and an air outlet connector. The base has a detection hole, and the air outlet connector is provided on the base and communicates with the bottom of the detection hole. A valve sleeve is installed in the detection hole. The air inlet connector is connected to the valve core and to an air supply device. Both the air inlet connector and the air outlet connector are connected to a pressure gauge.

2. The leakage detector for the valve core according to claim 1, characterized in that, The valve core grinding assembly also includes a pressure cap, which is detachably installed on the lifting platform. After the valve core to be adjusted and the valve sleeve are installed on the lifting platform, the pressure cap presses against the outer edge of the valve sleeve, and a gap is provided between the pressure cap and the valve core.

3. The leakage detector for the valve core according to claim 1, characterized in that, A clamping member is provided on the base and next to the detection hole, with one end of the clamping member extending to the opening of the detection hole.

4. The leakage detector for the valve core according to claim 1, characterized in that, The lifting drive includes a lifting bracket, a drive motor, a swing arm, a connecting rod, and a lifting seat. The lifting bracket includes a base and a vertical frame. The vertical frame is arranged vertically and its bottom end is fixed to the base. The drive motor is installed at the upper end of the vertical frame, and the swing arm is installed on the drive shaft of the drive motor. One end of the connecting rod is hinged to the swing arm at a predetermined distance from the drive shaft of the drive motor. The lifting seat is slidably disposed on the vertical frame, and the lifting platform is installed on the lifting seat. The end of the connecting rod opposite to the swing arm is hinged to the lifting seat.

5. The leakage detector for the valve core according to claim 4, characterized in that, The lifting drive also includes a guide assembly, which is disposed between the upright and the lifting seat. The guide assembly includes a guide rail and a guide slider. The guide rail is fixed to the upright, the guide slider is slidably disposed on the guide rail, and the lifting seat is mounted on the guide slider.

6. The leakage detector for the valve core according to claim 4, characterized in that, The middle part of the swing arm is connected to the drive shaft of the drive motor, and the weight of the end of the swing arm away from the end connected to the connecting rod is greater than the weight of the end connected to the connecting rod.

7. The leakage detector for the valve core according to claim 4, characterized in that, The lifting base has a slot, and the lifting platform has a locking foot on one side. When the lifting platform is installed on the lifting base, the locking foot is engaged in the slot.

8. The leakage detector for the valve core according to claim 2, characterized in that, It also includes a transfer fixing component, which is detachably installed outside the valve sleeve. The transfer fixing component includes a clamp, a clamping arm, a torsion spring, and a pressure block. The clamp is a "C"-shaped structure with an opening. An extended mounting seat is provided on the outer side of the clamp. The clamping arm is rotatably mounted on the mounting seat, and one end of the clamping arm extends to the inner side of the clamp. The pressure block is provided on the end of the clamping arm that extends to the inner side of the clamp. The torsion spring is provided between the clamping arm and the mounting seat.

9. The leakage detector for the valve core according to claim 8, characterized in that, The clamping arm extends upward at the end opposite to the clamp, and a clearance hole is provided on the bottom surface of the pressure cover. When the valve sleeve is installed in the detection hole on the lifting platform, the upper end of the valve sleeve extends into the clearance hole. Furthermore, a step is provided in the clearance hole to press down on the upper end of the valve sleeve. A clearance groove is provided on the bottom surface of the pressure cover and communicates with the corresponding clearance hole. When the transfer fixing component is installed on the valve cover, the clamp of the transfer fixing component is located in the clearance hole. The clamping arm, the torsion spring, and the mounting base are all located within the clearance groove. When the bottom surface of the pressure cover is not tightly attached to the lifting platform, the end of the clamping arm away from the clamp contacts the bottom of the clearance groove. When the pressure cover is pressed tightly against the lifting platform, the end of the clamping arm away from the clamp is pressed down, and the end of the clamping arm extending towards the inside of the clamp tilts upward. After the pressure cover is released, the end of the clamping arm extending to the inside of the clamp is pressed down to press the valve core inside the valve sleeve.

10. The leakage detector for the valve core according to claim 9, characterized in that, The transfer fixing component further includes an automatic retraction assembly, which is disposed between the mounting base and the clamping arm. The automatic retraction assembly includes a slide, a push spring, a limiting spring, and an unlocking push plate. The slide is slidably disposed on the mounting base and reciprocates in a direction moving away from or towards the clamp. The clamping arm is rotatably mounted on the slide, and one end of the torsion spring of the clamping arm abuts against the slide. The mounting base has a placement groove along the radial direction of the clamp, and the push spring is disposed in the placement groove. One end of the push spring abuts against the slide, and the other end of the push spring abuts against the end of the placement groove near the clamp. The mounting base is equipped with the limiting spring, and one end of the limiting spring protrudes towards the slide. After protruding, the limiting spring locks the slide. The mounting base is provided with a receiving hole at the bottom of the limiting spring. When pressed, the end of the limiting spring protruding towards the slide retracts into the receiving hole. The slide passes over the limiting spring. The bottom of the end of the clamping arm that extends upward is provided with the unlocking push plate. After the end of the clamping arm with the unlocking push plate deflects downward to a predetermined angle, the unlocking push plate contacts the protruding end of the limiting spring. The clamping arm is pressed down further, and the unlocking push plate presses the limiting spring into the receiving hole.

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