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CN-121977102-A - Efficient sealing valve and airtight automatic detection process thereof

CN121977102ACN 121977102 ACN121977102 ACN 121977102ACN-121977102-A

Abstract

The invention discloses a high-efficiency sealing valve and an airtight automatic detection process thereof, and solves the problems of uneven lateral stress of a piston of a traditional pneumatic sealing valve, single-side eccentric wear of a sealing element and self-locking of transmission clamping stagnation. The sealing valve comprises an upper cover, a lower cover, a lock nut and a valve seat body, wherein an inner support plate divides an adjusting cavity into an upper pneumatic cavity and a lower transmission cavity, a guide limiting sliding block and a non-self-locking multi-head screw rod are arranged in the upper pneumatic cavity, the bottom end of the screw rod is connected with a bevel gear, the lower transmission cavity is provided with a gear support and a first piston, the gear support is assembled through a radial guide structure, the gear support is rigidly limited in the horizontal direction and can slightly displace in the vertical direction and deflect around the axis of the valve at a small angle, two eccentric gears with 180 DEG of eccentric phase difference are arranged on the support, so that the radial force self-balancing is realized, the abrasion of a sealing element is relieved, and the running stability of the valve is improved.

Inventors

  • FU ZHENGQIANG
  • Zhang Cibin
  • LIN HUA

Assignees

  • 福州景腾精工橡塑制品有限公司

Dates

Publication Date
20260505
Application Date
20260403

Claims (8)

  1. 1. The efficient sealing valve comprises an upper cover (10), a lower cover (11), a lock nut (12) and a valve seat body (13) which are sequentially and hermetically assembled from top to bottom, wherein an air inlet hole (14) penetrating axially is formed in the upper cover (10), and an air inlet channel (100), an air outlet channel (101) and a membrane (102) are arranged in the valve seat body (13), and the efficient sealing valve is characterized in that: The upper cover (10) is in sealing butt joint with the lower cover (11) to form an adjusting cavity (200), a support plate (23) is fixedly arranged in the adjusting cavity (200), and the support plate (23) divides the adjusting cavity (200) into an upper pneumatic cavity (201) and a lower transmission cavity (202) which are mutually independent; The upper pneumatic cavity (201) is internally provided with a screw rod (20) and a sliding block (21), the sliding block (21) is in sealing sliding fit with the inner wall of the lower cover (11), circumferential limit is realized through a guide rod (211) fixed between the upper cover (10) and the support plate (23), the screw rod can only linearly slide along the axial direction, the screw rod (20) is in threaded fit with the sliding block (21), the screw rod (20) is axially limited and can circumferentially rotate, the bottom end of the screw rod is fixedly connected with a bevel gear (40), and a plurality of groups of buffer springs (22) which are uniformly distributed in the circumferential direction are arranged between the sliding block (21) and the support plate (23); The lower transmission cavity (202) is internally provided with a first piston (30) and a gear bracket (41), the gear bracket (41) is assembled on the inner side of the bracket plate (23) through a radial guide structure (300), the radial guide structure (300) comprises a horizontal partition plate (301) and a limit spring (302) which are symmetrically arranged on two sides of a horizontal structure plate of the gear bracket (41), the gear bracket (41) is rigidly limited in the horizontal direction and can be compensated in the vertical direction and can deflect around a central axis of a valve, two eccentric gears (42) meshed with the bevel gear (40) are symmetrically arranged on the gear bracket (41), the eccentric phases of the two eccentric gears (42) are different by 180 degrees, and the top side of the first piston (30) is provided with a bulge (43); The upper pneumatic cavity (201) is ventilated and then drives the sliding block (21) to move downwards axially, the sliding block (21) is limited in the circumferential direction and cannot rotate, the screw rod (20) is driven to rotate through the screw thread pair, the screw rod (40) and the eccentric gear (42) are meshed for transmission, the eccentric gear (42) pushes the bulge (43) to drive the first piston (30) to do pure axial linear motion, valve on-off control is achieved, lateral unbalanced load is avoided, and eccentric wear of sealing elements is avoided.
  2. 2. The efficient sealing valve of claim 1, wherein the helical angle of the helical gear (40) is 8-20 degrees, the normal modulus of the helical gear (40) is consistent with that of the eccentric gear (42), the screw rod (20) is a non-self-locking transmission screw rod, a multi-head thread structure is adopted, and the thread lead is 12-18 mm.
  3. 3. The efficient sealing valve according to claim 1, wherein the first piston (30) comprises a piston rod (31) and a piston disc (32) which are integrally formed, the piston rod (31) is in sliding sealing fit with the support plate (23), and the piston disc (32) is in sliding sealing fit with the inner wall of the lower cover (11).
  4. 4. The efficient sealing valve as claimed in claim 3, wherein a second piston (33) is fixedly sleeved on the outer side of the piston rod (31), the second piston (33) is located between the support plate (23) and the piston disc (32), the second piston (33) is in sliding sealing fit with the inner wall of the lower cover (11), and a sealing detection cavity (50) is formed by enclosing between the second piston (33) and the piston disc (32).
  5. 5. The efficient sealing valve of claim 4, wherein the side wall of the lower cover (11) is provided with a detection hole (51) corresponding to the sealing detection cavity (50), one end of the detection hole (51) is communicated with the sealing detection cavity (50), and the other end extends to the outer wall of the lower cover (11) for externally connecting airtight detection equipment.
  6. 6. The efficient sealing valve according to claim 1, wherein a pneumatic buffer cavity (60) is formed by surrounding the sliding block (21) and the supporting plate (23), and the pneumatic buffer cavity (60) is communicated with the upper pneumatic cavity (201) through a throttling channel (61).
  7. 7. The efficient sealing valve of claim 6, wherein a plurality of concentric annular throttling ribs (62) are arranged at the lower end face of the sliding block (21) and the upper end of the supporting plate (23), and the plurality of concentric annular throttling ribs (62) are nested in a staggered manner to form a labyrinth throttling structure.
  8. 8. The high-efficiency sealing valve airtight automatic detection process is suitable for the high-efficiency sealing valve according to any one of claims 1-7, and is characterized by realizing full-flow automatic detection based on a multi-station rotary detection table (400) matched with a visual positioning system, and sequentially comprising the steps of feeding positioning, workpiece butt joint, equipment self-detection, airtight accurate detection and discharging sorting; After the valve to be detected is subjected to feeding, the valve to be detected is aligned by a visual positioning system (401), the detection manipulator drives the sealing joint to be in sealing butt joint with the detection hole (51), after the system completes self-detection, standard test gas is introduced into the sealing detection cavity (50) and is maintained, the pressure change of the cavity is monitored to judge the air tightness, and after detection is completed, workpieces are automatically sorted, so that batch automatic detection is realized.

Description

Efficient sealing valve and airtight automatic detection process thereof Technical Field The invention relates to the technical field of sealing valves, in particular to a high-efficiency sealing valve and an airtight automatic detection process thereof. Background The sealing valve is a core execution component in the fluid conveying and controlling system, and the operation stability and the sealing durability directly determine the use safety of the pipeline system. The conventional pneumatic sealing valve mostly adopts a traditional direct-pushing structure, and the piston is directly driven to axially move by an air source, so that the internal diaphragm is pushed to complete the opening and closing of the valve. The traditional structure has obvious technical shortboards that due to lack of force balance transmission design, radial lateral force is easy to generate in the reciprocating motion process of a piston, so that a sealing piece on the periphery of the piston rod and the piston is stressed on one side for a long time, the problem of local excessive eccentric wear occurs, further, sealing leakage is caused, the service life of a valve is greatly shortened, the operation and maintenance and replacement cost of equipment are increased, and the use requirement of long-term stable operation of a high-end industrial scene is difficult to meet. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to solve the problems that the piston of the traditional direct-pushing pneumatic sealing valve is uneven in lateral stress and the sealing element is easy to be in unilateral eccentric wear failure, and provides the efficient sealing valve and the airtight automatic detection process thereof, so that the abrasion of the sealing element is relieved, the running stability of the valve is improved, and the dedicated airtight detection process is matched, thereby realizing the efficient quality control of the product batch. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The high-efficiency sealing valve comprises an upper cover, a lower cover, a lock nut and a valve seat body which are sequentially and hermetically assembled and connected from top to bottom, wherein an air inlet hole which axially penetrates through and is used for accessing compressed air is formed in the upper cover, an air inlet channel and an air outlet channel which are mutually matched are preset in the valve seat body, and a diaphragm used for sealing and stopping flow is embedded in the valve seat body corresponding to the opening and closing positions of the channels. The upper cover and the lower cover are in sealing butt joint through an end face sealing ring, a closed adjusting cavity is formed by surrounding the upper cover and the lower cover, a support plate is fixedly arranged in the adjusting cavity, the periphery of the support plate is in sealing fit with the inner wall of the lower cover, the adjusting cavity is strictly divided into an upper pneumatic cavity and a lower transmission cavity, and no gas leakage gap exists between the cavities; The inner wall of the sliding block is provided with an internal thread which is matched with the external thread of the screw rod in a precise thread way, the periphery of the sliding block is in sealed sliding fit with the inner wall of the lower cover through a sealing ring, two guide rods are symmetrically arranged on two sides of the sliding block, the two ends of the guide rods are respectively fixedly connected with the upper cover and a support plate, the circumferential limit of the sliding block is realized, the sliding block can only do linear reciprocating sliding along the axial direction of the valve, the rotation is stopped, a plurality of groups of buffer springs are uniformly distributed between the lower end surface of the sliding block and the upper end surface of the support plate in the circumferential direction, the two ends of each buffer spring are fixedly connected with the corresponding end surface respectively, and the sliding block is driven to quickly reset after the pressure of the pneumatic cavity is released; the lower transmission cavity is internally provided with a first piston and a gear bracket, the gear bracket is assembled on the inner side of a support plate through a radial guide structure, the radial guide structure comprises a horizontal partition plate and a limit spring which are symmetrically arranged on two sides of a horizontal structural plate of the gear bracket, the limit spring is arranged between the horizontal partition plate and the support plate, the gear bracket is rigidly limited in the horizontal direction and can generate displacement compensation in the vertical direction and can deflect around the central axis of a valve, the gear bracket is symmetrically provided with two eccentric gears which are engaged with a bevel gear for transmission, th