CN115468710A - Air tightness testing device and air tightness testing method - Google Patents
Air tightness testing device and air tightness testing method Download PDFInfo
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- CN115468710A CN115468710A CN202211354856.XA CN202211354856A CN115468710A CN 115468710 A CN115468710 A CN 115468710A CN 202211354856 A CN202211354856 A CN 202211354856A CN 115468710 A CN115468710 A CN 115468710A
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Abstract
The invention relates to the technical field of air tightness testing, in particular to an air tightness testing device and an air tightness testing method, wherein the air tightness testing device comprises a base, the left side and the right side of the base are respectively provided with a fixed block and a movable block, the fixed block is fixedly arranged on the left side of the base, the base corresponding to the movable block is provided with a rectangular groove, the movable block is positioned in the rectangular groove and is in sliding connection with the rectangular groove, a first threaded rod is arranged in the rectangular groove, one end of the first threaded rod is rotatably connected with the inner wall of the rectangular groove, the other end of the first threaded rod penetrates through the base and is provided with a handle fixedly connected with the base, two sides of the first threaded rod are respectively provided with a guide rod fixedly connected with the inner wall of the rectangular groove, the movable block and the fixed block are provided with sealing components for fixedly sealing valves, and the outer sides of the two sealing components are provided with testing components for testing the air tightness of the valves.
Description
Technical Field
The invention relates to the technical field of air tightness testing, in particular to an air tightness testing device and an air tightness testing method.
Background
The valve is a control part in a fluid conveying system and has the functions of stopping, adjusting, guiding, preventing counter flow, stabilizing pressure, shunting or overflowing and relieving pressure and the like. Valves used in fluid control systems range in variety and size from the simplest shut-off valves to the most sophisticated valves used in autonomous systems. The working process of the detection method is to move a fixed valve into a submersible valve testing pool filled with liquid, then ventilate the interior of the valve through an air pipe, and effectively determine the air leakage point of the valve through the position of air bubbles.
To this end, chinese patent publication No. CN207937131U discloses an air tightness testing device for a valve, which includes an air injection pipe, a detecting curved pipe and a valve, wherein a valve clamping main sleeve is welded to both the left end of the air injection pipe and the right end of the detecting curved pipe, a valve clamping auxiliary sleeve is tightly attached to the front surface of the valve clamping main sleeve, fastening screw holes are respectively formed at the upper and lower ends of the outer side wall of the valve clamping main sleeve and the outer side wall of the valve clamping auxiliary sleeve, the valve clamping main sleeve and the valve clamping auxiliary sleeve are fixed by tightening fastening bolts, the two ends of the valve are clamped, one end of the valve is injected by repeatedly pressing a pressing plate, before the air injection, whether the valve is closed or not is detected, after the air injection, the device is placed still, if the position of the detecting float is changed, the air tightness problem of the valve is identified, if the position of detecting float after the repeated air injection is performed for many times, the air tightness of the valve is identified as being qualified, although the air tightness detection problem of the valve is solved, because the variety and the valve detecting device cannot detect the valves of different specifications, the valve, the sealing hidden danger of the sealing problem of the air tightness is identified, and the device is not relatively poor.
Therefore, it is desirable to design a device and a method for testing air tightness to solve the above problems.
Disclosure of Invention
The invention aims to provide an air tightness testing device and an air tightness testing method, so as to solve the problem that air tightness of valves with different specifications cannot be detected in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an air tightness testing device, includes the base, the left and right sides of base is equipped with fixed block and movable block respectively, fixed block fixed mounting is in the left side of base, be equipped with the rectangular channel on the base that the movable block corresponds, just the movable block is located the rectangular channel to rather than sliding connection, be equipped with first threaded rod in the rectangular channel, the one end and the rectangular channel inner wall of first threaded rod rotate to be connected, and the other end runs through the base to be equipped with rather than fixed connection's handle, just the both sides of first threaded rod all be equipped with rectangular channel inner wall fixed connection's guide bar, be equipped with on movable block and the fixed block and carry out fixed seal's seal assembly to the valve, and two seal assembly's the outside is equipped with the test component to valve gas tightness test.
Preferably, the moving block positioned in the rectangular groove is respectively provided with a slotted hole matched with the first threaded rod and the guide rod.
Preferably, the sealing assembly comprises a cylinder, a rubber ring, a first moving ring, a second moving ring, a spring and a rotating ring, circular grooves matched with the cylinder are formed in the fixed block and the moving block, one end of the cylinder is located in the circular grooves and fixedly connected with the corresponding fixed block and the corresponding moving block respectively, annular grooves are formed in the surfaces of the cylinder, the rotating ring rotatably connected with the cylinder is sleeved on the annular grooves, the first moving ring is sleeved on the rotating ring, the spring is arranged on the first moving ring and the annular groove close to the circular grooves, one end of the spring is fixedly connected with the first moving ring, the other end of the spring is fixedly connected with the inner wall of the annular groove close to the circular grooves, the second moving ring is sleeved on one side, away from the circular grooves, of the first moving ring, the second moving ring is in contact with the surface, adjacent to the first moving ring, the rubber ring is arranged between one side, away from the first moving ring, of the second moving ring and the inner wall of the annular groove, one end of the rubber ring is fixedly connected with one side of the second moving ring, and the other end of the rotating ring is fixedly connected with the inner wall of the annular groove.
Preferably, the rotating ring is provided with a first driving groove and a second driving groove respectively, the number of the first driving groove and the number of the second driving groove are four, and the inner sides of the first moving ring and the second moving ring are provided with driving blocks corresponding to the first driving groove and the second driving groove respectively.
Preferably, the first driving groove and the second driving groove are spirally arranged, and the spiral shape of the first driving groove and the spiral shape of the second driving groove are reverse spiral.
Preferably, four bar-shaped rods are arranged in the annular groove on the rotating ring, two ends of each bar-shaped rod are fixedly connected with the inner wall of the annular groove, and the inner sides of the first moving ring and the second moving ring are provided with bar-shaped grooves corresponding to the bar-shaped rods.
Preferably, the interior of the cylinder is a hollow structure.
Preferably, the testing component comprises a first air cavity, a first piston, a second air cavity, a second threaded rod and a second piston, the first air cavity is located on one side of the fixed block and fixedly connected with a cylinder on one side of the fixed block, the second air cavity is located on one side of the moving block and fixedly connected with the cylinder on one side of the moving block, round holes communicated with the first air cavity and the second air cavity are formed in one side of the cylinder, two limiting strips are arranged in the first air cavity and the second air cavity from top to bottom, the horizontal positions of the two limiting strips in the first air cavity are the same as the horizontal positions of the two limiting strips in the second air cavity, the first piston is located on the limiting strip on the lower side of the first air cavity, the second piston is located below the limiting strip on the upper side of the second air cavity, the second threaded rod fixedly connected with the second piston is arranged at the upper end of the second air cavity, a baffle fixedly connected with the second air cavity is arranged at the upper end of the second air cavity, and a threaded hole matched with the second threaded rod is formed in the baffle.
Preferably, a sealing structure is arranged between the first air cavity and the first piston, a sealing structure is arranged between the second air cavity and the second piston, and the middle parts of the four sides of the first air cavity and the second air cavity are made of transparent materials.
A method of testing for hermeticity, the method comprising the steps of:
s1, firstly, placing an opening at one end of a valve on a sealing assembly on a fixed block by holding the valve by hand, and enabling the sealing assembly to be coated.
S2, then, the handle is held by one hand and rotated, the first threaded rod rotates along with the handle, the moving block is enabled to be close to the fixed block, the sealing assembly on the moving block enters into the other opening position of the valve along with the sealing assembly, the first threaded rod continues to rotate, the opening positions on the two sides of the valve are in contact with the first moving ring and extrude the first moving ring, the driving block fixed on the inner side of the first moving ring is matched with the first driving groove, the rotating ring rotates, the driving block on the inner side of the second moving ring is matched with the second driving groove along with the driving block, the rubber ring is moved in the direction far away from the first moving ring, the rubber ring is extruded to be protruded and attached to the inner wall of the opening of the valve, and sealing is achieved.
S3, holding the upper end of the second threaded rod by one hand, rotating, enabling the second threaded rod to move downwards in the second air cavity, enabling the second piston to leave the limiting strip on the upper side of the second threaded rod and move towards the limiting strip on the lower side of the second threaded rod, extruding air in the second air cavity and the valve into the first air cavity through the cylinder, enabling the first piston to leave the limiting strip on the lower side of the first piston and move towards the limiting strip on the upper side of the first piston.
And S4, observing whether the second piston is in contact with the limiting strip on the lower side of the second piston or not, and if the first piston is in contact with the limiting strip on the upper side of the second piston, determining that the product is qualified, and if the first piston is not in contact with the limiting strip on the upper side of the second piston, determining that the product is unqualified.
S5, finally, holding the second threaded rod again to rotate towards the front opposite direction, moving the second piston upwards until contacting with the limiting strip on the upper side, resetting the testing assembly, holding the handle at the front end of the first threaded rod and rotating towards the front opposite direction, resetting the sealing assembly, taking down the tested valve, and classifying the qualified and unqualified valves.
Compared with the prior art, the invention has the beneficial effects that: the air tightness testing device and the air tightness testing method can be used for quickly fixing and sealing valves of different specifications and simultaneously testing the air tightness of the valves.
(1) The movable block is pushed to move towards the fixed block through the first threaded rod, the valve between the fixed block and the movable block extrudes the first movable ring in contact with the fixed block, the spring is compressed, the rotating ring rotates along with the spring, the second movable ring is driven to move towards the direction of the valve, and the rubber ring is extruded and protruded along with the second movable ring to seal the open position of the valve.
(2) The second threaded rod drives the second piston to move downwards in the second air cavity, air in the second air cavity can enter the valve along with the second threaded rod, the air in the valve is squeezed into the first air cavity, the first piston is pushed to move upwards, the second piston is made to move to the limiting strip at the lower end of the second piston, whether the first piston is in contact with the limiting strip at the upper end of the second piston or not is observed, and if the first piston is in contact with the limiting strip, the air tightness can be judged to be qualified.
Drawings
FIG. 1 is a schematic view of the entire structure of the present invention;
FIG. 2 is a schematic view of a mating structure of a base and a sealing assembly according to the present invention;
FIG. 3 is an exploded view of the seal assembly of the present invention;
FIG. 4 is a schematic cross-sectional view of the seal assembly of the present invention;
FIG. 5 is a schematic view of a test assembly according to the present invention.
In the figure: 1. a base; 2. a valve; 3. a fixed block; 4. a moving block; 5. a first threaded rod; 6. a handle; 7. a guide bar; 8. a cylinder; 9. a rubber ring; 10. a first moving ring; 11. a second moving ring; 12. a spring; 13. a rotating ring; 14. an annular groove; 15. a first drive slot; 16. a second driving groove; 17. a drive block; 18. a bar-shaped rod; 19. a strip-shaped groove; 20. a first air cavity; 21. a first piston; 22. a second air cavity; 23. a second threaded rod; 24. a second piston; 25. and (5) a limiting strip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, an embodiment of the present invention: the utility model provides an air tightness testing device, the on-line screen storage device comprises a base 1, the left and right sides of base 1 is equipped with fixed block 3 and movable block 4 respectively, 3 fixed mounting in the left side of base 1 of fixed block, be equipped with the rectangular channel on the base 1 that movable block 4 corresponds, and movable block 4 is located the rectangular channel, and rather than sliding connection, be equipped with first threaded rod 5 in the rectangular channel, the one end and the rectangular channel inner wall of first threaded rod 5 rotate to be connected, the other end runs through base 1, and be equipped with rather than fixed connection's handle 6, and the both sides of first threaded rod 5 all are equipped with the guide bar 7 with rectangular channel inner wall fixed connection, be equipped with on movable block 4 and the fixed block 3 and carry out the seal assembly of fixed seal to valve 2, and the outside of two seal assembly is equipped with the test component to the air tightness test of valve 2.
Further, be located on the movable block 4 of rectangular channel respectively be equipped with first threaded rod 5, the slotted hole of guide bar 7 looks adaptation, in operation, put into seal assembly with the uncovered department of valve 2 of required test leakproofness on, clockwise rotation handle 6 drives and rotates rather than fixed connection's first threaded rod 5, move towards fixed block 3 direction thereupon with movable block 4 of 5 looks adaptations of first threaded rod, seal assembly on movable block 4 and the fixed block 3 seals valve 2 thereupon, the leakproofness is tested to it to the rethread test assembly.
Further, considering that when the valve 2 is tested for air tightness, the valve 2 needs to be sealed, a sealing assembly needs to be arranged to seal the valve 2, and because the variety and specification of the valve 2 are quite various, when the valve 2 is tested for air tightness, the valve 2 of different specifications needs to be sealed, the sealing assembly comprises a cylinder 8, a rubber ring 9, a first moving ring 10, a second moving ring 11, a spring 12 and a rotating ring 13, circular grooves adapted to the cylinder 8 are arranged on the fixed block 3 and the moving block 4, one end of the cylinder 8 is located in the circular grooves and respectively fixedly connected with the corresponding fixed block 3 and the moving block 4, a circular groove 14 is arranged on the surface of the cylinder 8, a rotating ring 13 rotatably connected with the cylinder 8 is sleeved on the circular groove 14, the first moving ring 10 is sleeved on the rotating ring 13, in order to enable the sealing assembly to seal the valve 2, the sealing assembly can reset, the sealing assembly can be reset, so that a spring 12 is arranged on the circular grooves 14 close to the circular grooves, the first moving ring 10 and the circular groove 14, a restoring force is driven by the spring 12, one end of the sealing assembly is reset, and the other end of the spring 12 is connected with the fixed rubber ring 10, when the inner wall of the first moving ring 9 is connected with the inner wall of the second moving ring 11, and the rubber ring 11, one side of the second moving ring 9, the rubber ring 11, the rubber ring is connected with the rubber ring 11, and the rubber ring 9, one side of the rubber ring 9, the rubber ring 14, the rubber ring is conveniently connected with the rubber ring 11, one side of the second moving ring 9, and the rubber ring 9, the other end is fixedly connected with the inner wall of the annular groove 14.
Further, in order to move the second moving ring 11 in the opposite direction when the first moving ring 10 moves in the circular groove direction, the rotating ring 13 is provided with a first driving groove 15 and a second driving groove 16, four driving grooves 15 and 16 are provided, and driving blocks 17 corresponding to the first driving groove 15 and the second driving groove 16 are provided inside the first moving ring 10 and the second moving ring 11, respectively.
Further, the first driving groove 15 and the second driving groove 16 are spirally arranged, and the spiral shape of the first driving groove 15 and the second driving groove 16 is reverse spiral, when the moving block 4 moves towards the fixed block 3, the valve 2 is pushed on the sealing assembly along with the spiral shape, the opening of the valve 2 is contacted with the first moving ring 10 and is extruded, the first moving ring 10 is pushed to move towards the circular groove, the spring 12 is compressed along with the first moving ring 10, the driving block 17 fixedly connected with the inner side of the first moving ring 10 is matched with the first driving groove 15 in the rotating ring 13, the rotating ring 13 is driven to rotate in the annular groove 14, the driving block 17 fixedly connected with the inner side of the second moving ring 11 is matched with the second driving groove 16, the second moving ring 11 moves towards the opposite direction of the first moving ring 10, the rubber ring 9 is extruded along with the second moving ring 9, the rubber ring 9 is extruded and is attached to the opening of the valve 2 and is sealed, after the test is finished, the valve 2 is taken away, the restoring force of the rubber ring 12 and the moving ring 9 is reset along with the rotating ring 13, and the rotating of the rotating ring 13 is reset.
Further, in order to ensure that the first moving ring 10 and the second moving ring 11 do not rotate and the rotating ring 13 can rotate when the first moving ring 10 moves towards the circular groove, four bar-shaped rods 18 are arranged in the annular groove 14 on the rotating ring 13, both ends of each bar-shaped rod 18 are fixedly connected with the inner wall of the annular groove 14, strip-shaped grooves 19 corresponding to the bar-shaped rods 18 are arranged on the inner sides of the first moving ring 10 and the second moving ring 11, and the first moving ring 10 and the second moving ring 11 are limited and can only move through the matching between the bar-shaped rods 18 and the strip-shaped grooves 19.
Further, in order to communicate the valve 2 with the testing assembly through the sealing assembly, the inside of the cylinder 8 is a hollow structure.
Further, considering that when the valve 2 is delivered from a factory, the air tightness test needs to be carried out on the valve, and the quality of the valve is ensured, a test component is arranged, the test component comprises a first air cavity 20, a first piston 21, a second air cavity 22, a second threaded rod 23 and a second piston 24, the first air cavity 20 is positioned on one side of the fixed block 3 and is fixedly connected with the cylinder 8 on one side of the fixed block 3, the second air cavity 22 is positioned on one side of the moving block 4 and is fixedly connected with the cylinder 8 on one side of the moving block 4, round holes communicated with the first air cavity 20 and the second air cavity 22 are respectively arranged on one side of the cylinder 8, two limiting strips 25 are respectively arranged in the first air cavity 20 and the second air cavity 22 from top to bottom, in order to judge whether the air tightness of the valve 2 is qualified, and therefore, the horizontal positions of the two limiting strips 25 in the first air cavity 20 are the same as the horizontal positions of the two limiting strips 25 in the second air cavity 22, the first piston 21 is positioned on a limit strip 25 at the lower side of the first air cavity 20, the second piston 24 is positioned below the limit strip 25 at the upper side of the second air cavity 22, a second threaded rod 23 fixedly connected with the second piston 24 is arranged at the upper end of the second piston 24, a baffle fixedly connected with the second piston is arranged at the upper end of the second air cavity 22, a threaded hole matched with the second threaded rod 23 is arranged in the baffle, after the valve 2 is sealed through a sealing component, the second threaded rod 23 is rotated to drive the second piston 24 to be separated from the limit strip 25 at the upper side in the second air cavity 22, the second piston moves towards the limit strip 25 at the lower side in the second air cavity 22, the gas in the second air cavity 22 is compressed into the valve 2 through the cylinder 8, the gas in the valve 2 is compressed into the first air cavity 20 through the cylinder 8, the first piston 21 in the first air cavity 20 leaves the limit strip 25 at the lower side in the first air cavity 20 along with the first piston, move towards the direction of the upper limit strip 25 in the first air cavity 20, when the second piston 24 contacts with the lower limit strip 25, it can be observed whether the first piston 21 contacts with the upper limit strip 25, if so, it can be judged that the air tightness of the valve 2 is qualified.
Furthermore, a sealing structure is arranged between the first air cavity 20 and the first piston 21, and a sealing structure is arranged between the second air cavity 22 and the second piston 24, so that the observation of people is facilitated, and the middle parts of four sides of the first air cavity 20 and the second air cavity 22 are made of transparent materials.
A test method for air tightness comprises the following steps:
s1, firstly, according to the figures 1 and 2, an opening at one end of a valve 2 is placed on a sealing assembly on a fixed block 3 through holding the valve by hand, so that the sealing assembly is coated.
S2, according to the figures 1 and 2, the handle 6 is held by a single hand and rotated, the first threaded rod 5 rotates, the moving block 4 is enabled to be close to the fixed block 3, the sealing assembly on the moving block 4 enters into the other open position of the valve 2, the first threaded rod 5 continues to rotate, the open positions on two sides of the valve 2 are in contact with the first moving ring 10 and extrude the first moving ring, the driving block 17 fixed on the inner side of the first moving ring 10 is matched with the first driving groove 15, the rotating ring 13 rotates, the driving block 17 fixed on the inner side of the second moving ring 11 is matched with the second driving groove 16, the rubber ring 9 is extruded to be protruded and attached to the inner wall of the opening of the valve, sealing is achieved, the moving block 4 is driven by the first threaded rod 5 to move towards the fixed block 3 and is linked with the sealing assembly, the sealing assembly is matched with the first threaded rod 5 to seal the two open positions of the valve, the sealing assembly can seal the valves 2 with different specifications, and the practicability of the valve is improved.
And S3, according to the figures 1 to 4, the upper end of the second threaded rod 23 is held by one hand to rotate, the second threaded rod 23 moves downwards in the second air cavity 22 along with the second threaded rod, the second piston 24 moves away from the limit strip 25 on the upper side of the second threaded rod and moves towards the limit strip 25 on the lower side of the second threaded rod, air in the second air cavity 22 and the valve 2 can be extruded into the first air cavity 20 through the cylinder 8, the first piston 21 moves away from the limit strip 25 on the lower side of the first piston and moves towards the limit strip 25 on the upper side of the first piston, and through the arrangement of the first air cavity 20, the second air cavity 22 and the inner limit strip 25, the first piston 21 and the second piston 24 can move for the same distance in the two identical first air cavity 20 and second air cavity 22 respectively, so that people can conveniently observe the pistons in the two air cavities, and judge whether the air tightness of the valve 2 is qualified or not.
And S4, observing whether the second piston 24 is contacted with the limiting strip 25 on the lower side of the second piston according to the graph of FIG. 5, and then judging whether the first piston 21 is contacted with the limiting strip 25 on the upper side of the second piston, wherein if the first piston is contacted with the limiting strip 25 on the upper side of the second piston, the product is qualified, and if the first piston is not contacted with the limiting strip, the product is unqualified.
And S5, according to the figures 1 and 2, holding the second threaded rod 23 again to rotate towards the front opposite direction, moving the second piston 24 upwards until the second piston contacts with the limiting strip 25 on the upper side to reset the testing assembly, holding the handle 6 at the front end of the first threaded rod 5 to rotate towards the front opposite direction, resetting the sealing assembly, taking down the tested valve 2, and classifying the qualified and unqualified valves 2.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. An air tightness testing device comprises a base (1), and is characterized in that: the left and right sides of base (1) is equipped with fixed block (3) and movable block (4) respectively, fixed block (3) fixed mounting is in the left side of base (1), be equipped with the rectangular channel on base (1) that movable block (4) correspond, just movable block (4) are located the rectangular channel to rather than sliding connection, be equipped with first threaded rod (5) in the rectangular channel, the one end and the rectangular channel inner wall of first threaded rod (5) rotate to be connected, and the other end runs through base (1) to be equipped with rather than fixed connection's handle (6), just the both sides of first threaded rod (5) all are equipped with guide bar (7) with rectangular channel inner wall fixed connection, be equipped with on movable block (4) and fixed block (3) and carry out the seal's seal assembly to valve (2), and two seal assembly's the outside is equipped with the test component to valve (2) gas tightness test.
2. The airtightness testing apparatus according to claim 1, wherein: and slotted holes matched with the first threaded rod (5) and the guide rod (7) are respectively formed in the moving block (4) positioned in the rectangular groove.
3. The airtightness testing apparatus according to claim 1, wherein: the sealing component comprises a cylinder (8), a rubber ring (9), a first moving ring (10), a second moving ring (11), a spring (12) and a rotating ring (13), wherein circular grooves matched with the cylinder (8) are formed in the fixed block (3) and the moving block (4), one end of the cylinder (8) is positioned in the circular grooves and fixedly connected with the corresponding fixed block (3) and the corresponding moving block (4) respectively, a circular groove (14) is formed in the surface of the cylinder (8), the rotating ring (13) rotatably connected with the cylinder (8) is sleeved on the circular groove (14), the first moving ring (10) is sleeved on the rotating ring (13), the spring (12) is arranged on the first moving ring (10) and the circular groove (14) close to the circular groove, one end of the spring (12) is fixedly connected with the first moving ring (10), the other end of the spring is fixedly connected with the inner wall of the circular groove (14) close to the circular groove, the rotating ring (13) on one side, far away from the circular groove, of the first moving ring (10), the second moving ring (11) is sleeved on the rotating ring (13), the side, the second moving ring (11) is in contact with the inner wall of the rubber ring (9), and the inner wall (14) of the second moving ring (10) is arranged on one side, and the side, the second moving ring (11) far away from the first moving ring (10), and one end of the rubber ring (9) is fixedly connected with one side of the second movable ring (11), and the other end of the rubber ring is fixedly connected with the inner wall of the annular groove (14).
4. A tightness testing device according to claim 3, wherein: the rotating ring (13) is provided with a first driving groove (15) and a second driving groove (16) respectively, the number of the first driving groove (15) and the number of the second driving groove (16) are four, and the inner sides of the first moving ring (10) and the second moving ring (11) are provided with driving blocks (17) corresponding to the first driving groove (15) and the second driving groove (16) respectively.
5. The airtightness testing apparatus according to claim 4, wherein: the first driving groove (15) and the second driving groove (16) are spirally arranged, and the spirals of the first driving groove (15) and the second driving groove (16) are reverse spirals.
6. The airtightness testing apparatus according to claim 4, wherein: four strip-shaped rods (18) are arranged in the annular groove (14) on the rotating ring (13), two ends of each strip-shaped rod (18) are fixedly connected with the inner wall of the annular groove (14), and strip-shaped grooves (19) corresponding to the strip-shaped rods (18) are formed in the inner sides of the first moving ring (10) and the second moving ring (11).
7. The airtightness testing apparatus according to claim 4, wherein: the interior of the cylinder (8) is of a hollow structure.
8. The airtightness testing apparatus according to claim 1, wherein: the testing component comprises a first air cavity (20), a first piston (21), a second air cavity (22), a second threaded rod (23) and a second piston (24), the first air cavity (20) is positioned on one side of the fixing block (3), and is fixedly connected with a cylinder (8) at one side of the fixed block (3), the second air cavity (22) is positioned at one side of the moving block (4), and is fixedly connected with a cylinder (8) at one side of the moving block (4), round holes communicated with the first air cavity (20) and the second air cavity (22) are arranged on the sides contacted with the cylinder (8), two limiting strips (25) are respectively arranged in the first air cavity (20) and the second air cavity (22) from top to bottom, and the horizontal positions of the two limiting strips (25) in the first air cavity (20) are the same as the horizontal positions of the two limiting strips (25) in the second air cavity (22), the first piston (21) is positioned on a limit strip (25) at the lower side of the first air cavity (20), the second piston (24) is positioned under a limit strip (25) at the upper side of the second air cavity (22), and the upper end of the second piston (24) is provided with a second threaded rod (23) fixedly connected with the second piston, and the upper end of the second air cavity (22) is provided with a baffle fixedly connected with the second air cavity, and a threaded hole matched with the second threaded rod (23) is formed in the baffle.
9. The airtightness testing apparatus according to claim 8, wherein: a sealing structure is arranged between the first air cavity (20) and the first piston (21), a sealing structure is arranged between the second air cavity (22) and the second piston (24), and the middle parts of four surfaces of the first air cavity (20) and the second air cavity (22) are made of transparent materials.
10. A airtightness testing method comprising the airtightness testing apparatus according to claim 9, wherein: the testing method comprises the following steps:
s1, firstly, placing an opening at one end of a valve (2) on a sealing component on a fixed block (3) by holding the valve by hand, and coating the sealing component;
s2, a handle (6) is held by a single hand and rotated, the first threaded rod (5) rotates along with the handle, the moving block (4) approaches to the fixed block (3), the sealing component on the moving block (4) enters the other open position of the valve (2) along with the handle, the first threaded rod (5) continues to rotate, the open positions on the two sides of the valve (2) are in contact with the first moving ring (10) and extrude the first moving ring, the rotating ring (13) rotates through the matching between the driving block (17) fixed on the inner side of the first moving ring (10) and the first driving groove (15), the driving block (17) on the inner side of the second moving ring (11) is matched with the second driving groove (16) along with the first moving ring, the rubber ring (9) is extruded to be protruded and attached to the inner wall of the open position of the valve, and sealing is achieved;
s3, holding the upper end of the second threaded rod (23) by one hand, rotating, enabling the second threaded rod (23) to move downwards in the second air cavity (22) along with the second threaded rod, enabling the second piston (24) to leave the limiting strip (25) on the upper side of the second threaded rod and move towards the limiting strip (25) on the lower side of the second threaded rod, extruding air in the second air cavity (22) and the valve (2) into the first air cavity (20) through the cylinder (8), enabling the first piston (21) to leave the limiting strip (25) on the lower side of the first piston and move towards the limiting strip (25) on the upper side of the first piston;
s4, observing whether the second piston (24) is in contact with the limiting strip (25) on the lower side of the second piston, and whether the first piston (21) is in contact with the limiting strip (25) on the upper side of the first piston, wherein if the first piston is in contact with the limiting strip, the product is qualified, and if the first piston is not in contact with the limiting strip, the product is unqualified;
s5, finally, holding the second threaded rod (23) again to rotate in the forward and reverse directions, moving the second piston (24) upwards until the second piston is contacted with the limit strip (25) on the upper side to reset the testing assembly, holding the handle (6) at the front end of the first threaded rod (5) by hand and rotating in the forward and reverse directions to reset the sealing assembly, taking down the tested valve (2), and classifying the qualified and unqualified valves (2).
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