Pressure sealing performance testing device for self-centering rubber sealing element

Abstract

The invention relates to the technical field of sealing performance testing, in particular to a self-centering rubber sealing element pressure sealing performance testing device which comprises a base and a pressing block, the top of the base is fixedly connected with a set of limiting rods, the pressing block is located at the top of the base and slidably connected with the limiting rods, and a clamping mechanism is arranged at the top of the base. The clamping mechanism comprises an operation table fixedly connected to the center of the top of the base, a movable bin is formed in the top of the operation table, an adjusting mechanism is arranged in the movable bin, and a detection mechanism is arranged at the top of the pressing block. A movable block higher than a connecting ring is extruded to move downwards through downward movement of a pressing block, so that a driving wheel drives a driven wheel to rotate, a steel wire rope is released, a sliding block is made to diffuse and move outwards with the movable block as the circle center, and therefore an adjusting block is driven to push a deviated rubber sealing element to be detected to the center position of an operation table; before the rubber sealing element is completely clamped and fixed, the rubber sealing element is adjusted to the central position of the operation table, so that the leakage risk possibly caused by position deviation is reduced, and the test accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of sealing test, in particular to a self-centering rubber sealing component pressure sealing test device. Background Art

[0002] Rubber seals are a type of universal basic components in sealing devices. They play an important role in preventing fluids or solid particles from leaking between adjacent mating surfaces and preventing external impurities such as dust and moisture from invading the interior of machinery and equipment. Modified rubber seals are sealing components that use modification technology to process traditional rubber to improve its performance, stability and service life. They have excellent properties such as high temperature resistance, oil resistance, corrosion resistance, and wear resistance, and can adapt to complex and changing working environments. The sealing test of rubber seals is an important link in ensuring their performance and quality, and is crucial to preventing liquid or gas leakage.

[0003] When testing the sealing performance of rubber seals, due to the design requirements of the sealing structure, if the sealing structure is symmetrically designed and the rubber rings as sealing elements need to be evenly distributed on the sealing surface, then centering the rubber rings is a key step to ensure the sealing effect. However, existing testing devices are often not smart and precise enough when centering the rubber seals, which is not conducive to achieving uniform force on the sealing surface and may also cause leakage risks due to position offset. Secondly, in some cases, some rubber seals have specific installation positions, and the sealing structure may require that the rubber ring must be installed in a specific position, such as the center position, to ensure the best sealing effect. Therefore, when testing, it is also necessary to install it in the center position as required for testing, so that the results obtained can be closer to the actual situation.

[0004] Similarly, due to the requirements of sealing performance, when testing the rubber ring under dynamic conditions, such as rotation, vibration or impact load, if it is not placed in the center, it will be difficult to maintain its stability on the sealing surface, and the sealing test results may not conform to the actual situation due to position changes.

[0005] Due to the requirements of testing standards or specifications, some industries or fields may have formulated specific testing standards or specifications, which clearly stipulate the position requirements of rubber rings during sealing tests. If the standards or specifications require that the rubber ring must be placed in the center, it should be strictly followed; and in some cases, customers may make clear requirements on the placement of the rubber ring based on their own usage needs or specific requirements. At this time, in order to meet the needs of customers, the rubber ring also needs to be placed in the center during sealing tests.

[0006] However, the prior art is unable to effectively solve or avoid the above problems during centering test. The test equipment does not have the effect of fast and non-deformable centering of the seal, and the use of purely mechanical centering can easily cause deformation of the seal and thus affect the authenticity of the test results.

[0007] Therefore, the present invention provides a self-centering rubber seal pressure tightness testing device capable of automatically, quickly and non-destructively centering a test object. Summary of the invention

[0008] In view of the problem in the prior art that when testing the sealing performance of a rubber seal, the position of the rubber seal may be offset, resulting in a series of inaccurate test results, the present invention provides a self-centering rubber seal pressure sealing performance testing device.

[0009] The technical solution adopted by the present invention to solve the technical problem is: a self-centering rubber seal pressure sealing test device, including a base and a pressure block, a group of limit rods are fixedly connected to the top of the base, the pressure block is located at the top of the base and is slidably connected to the limit rods, a clamping mechanism is arranged on the top of the base, the clamping mechanism includes an operating table fixedly connected to the center of the top of the base, a movable bin is opened on the top of the operating table, an adjustment mechanism is arranged in the movable bin, and a detection mechanism is arranged on the top of the pressure block; A clamping mechanism, which is equipped to clamp and fix the rubber seal placed on the operating table by moving the pressure block downward; The adjustment mechanism is assembled to make appropriate adjustments according to the different specifications of the rubber seal to be tested before testing, and the movable block slidably connected to the operating table is pressed by the downward-moving pressing block, so that the adjustment block slidably connected to the top of the operating table moves, and the rubber seal is brought to the center position of the operating table; The detection mechanism is assembled so that when the pressure block moves down and abuts against the adjustment mechanism, the auxiliary adjustment mechanism brings the rubber seal to be detected to the center position, and detects the sealing performance of the rubber seal according to the change of air pressure when the rubber seal is fully clamped.

[0010] Preferably, the clamping mechanism also includes a mold cavity opened at the bottom of the pressing block, a connecting ring is threadedly connected to the top of the operating table, a group of first through holes are opened on the upper side wall of the connecting ring, a group of mounting grooves are opened on the upper inner wall of the connecting ring, a movable block is slidably connected in the connecting ring, a fixed plate is fixedly connected to the outer wall of the movable block, a first spring is fixedly connected to the bottom of the fixed plate, one end of the first spring away from the fixed plate is fixedly connected to the bottom of the mounting groove, and a second through hole is opened on the upper side wall of the movable block.

[0011] Preferably, a rubber ring is fixedly connected to the bottom end of the connecting ring, and the rubber ring abuts against the inner wall of the operating table.

[0012] Preferably, the second through hole corresponds to the first through hole, and the height of the second through hole is greater than the height of the first through hole, and the top of the connecting ring is higher than the top of the operating table.

[0013] Preferably, the adjustment mechanism also includes a threaded rod fixedly connected to the bottom of the movable block, the bottom of the movable bin is rotatably connected to a driving wheel, a spiral groove is provided on the top of the driving wheel, the threaded rod is threadedly connected to the driving wheel, a group of sliding grooves are provided in the operating table, a slider is slidably connected in the sliding grooves, a second spring is fixedly connected to one side of the sliding groove close to the center of the operating table, and the second spring is fixedly connected to the slider at one end away from the center of the operating table.

[0014] Preferably, a group of movable shafts are rotatably connected in the movable warehouse, a driven wheel is fixedly connected to the lower end of the movable shaft, the driven wheel is meshed with the driving wheel, a pulley is fixedly connected to the upper end of the movable shaft, a steel wire rope is fixedly connected to the pulley, and the end of the steel wire rope away from the pulley passes through the inner wall of the operating table and is fixedly connected to the slider.

[0015] Preferably, an electromagnet is provided on the top of the sliding block, and the adjusting block cooperates with the electromagnet.

[0016] Preferably, the detection mechanism comprises an air pump installed on the top of the pressing block, an air inlet is opened at the center of the pressing block, the air inlet cooperates with the air pump, and an air pressure sensor is fixedly installed on the top of the pressing block.

[0017] Preferably, the mold cavity cooperates with an operating table, and the diameter of the mold cavity is larger than the diameter of the operating table.

[0018] Preferably, the thread on the outside of the connecting ring is located below the first through hole, and the length of the internal thread arranged on the inner wall of the operating table is smaller than the length of the thread on the outside of the connecting ring.

[0019] Beneficial effects of the present invention: (1) The self-centering rubber seal pressure sealing test device described in the present invention has a pressure block that moves downward so that the movable block higher than the connecting ring is squeezed and moved downward. The downward movement of the movable block causes the driving wheel to drive the driven wheel to rotate, thereby releasing the wire rope, causing the slider to move outward with the movable block as the center, thereby driving the adjustment block to push the offset rubber seal to be tested to the center position of the operating table. Before the rubber seal is completely clamped and fixed, it is adjusted to the center position of the operating table, thereby reducing the risk of leakage caused by position offset and improving the accuracy of the test.

[0020] (2) The present invention discloses a self-centering rubber seal pressure sealing test device. When the pressure block abuts against the top of the movable block, the air pump inflates the movable block through the air inlet, so that the airflow diffuses outward through the second through hole and the second through hole, impacting the offset rubber seal. This structure can not only use the wind-assisted adjustment block to push the seal to move so that it is quickly centered, but also inflate the positioned rubber seal to test its sealing performance. Compared with the pure mechanical thrust centering method in the prior art, this design is not easy to cause deformation of the seal and lead to test errors.

[0021] (3) The self-centering rubber seal pressure tightness testing device described in the present invention can drive the adjustment block to move by adjusting the height of the connecting ring to adapt to the testing of rubber seals of different specifications and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 A schematic diagram of the overall structure provided by the present invention; Figure 2 A schematic diagram of the structure of the base and the pressing block provided by the present invention; Figure 3 A cross-sectional view of the internal structure of the operating table provided by the present invention; Figure 4 for Figure 3 A magnified image of point A; Figure 5 A cross-sectional view of the operating table provided by the present invention; Figure 6 A schematic diagram of the connection between the clamping mechanism and the adjusting mechanism provided by the present invention; Figure 7 A schematic diagram of a connection ring provided by the present invention; Figure 8 A schematic diagram of the structure of the connecting ring and the movable block provided by the present invention; Fig. 9 A schematic diagram of the connection between the connecting ring and the movable block provided by the present invention; Fig.10 A schematic diagram of the adjustment mechanism provided by the present invention; Fig.11 This is a schematic diagram of the connection between the threaded rod and the driving wheel provided by the present invention.

[0024] In the figure: 1. base; 11. limit rod; 2. pressure block; 3. clamping mechanism; 31. operating table; 32. mold cavity; 33. connecting ring; 34. first through hole; 35. mounting groove; 36. rubber ring; 37. movable block; 38. fixing plate; 39. first spring; 310. second through hole; 4. adjusting mechanism; 41. movable bin; 42. slide groove; 43. threaded rod; 44. driving wheel; 45. driven wheel; 46. movable shaft; 47. pulley; 48. wire rope; 49. slider; 410. second spring; 411. adjusting block; 412. spiral groove; 5. detection mechanism; 51. air pump; 52. air inlet; 53. air pressure sensor. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0026] Example: Figure 1-Figure 11 As shown, a self-centering rubber seal pressure tightness testing device of the present invention comprises a base 1 and a pressure block 2, a group of limit rods 11 are fixedly connected to the top of the base 1, the pressure block 2 is located at the top of the base 1 and is slidably connected to the limit rods 11, a clamping mechanism 3 is arranged on the top of the base 1, the clamping mechanism 3 comprises an operating table 31 fixedly connected to the top center of the base 1, a movable bin 41 is opened on the top of the operating table 31, an adjusting mechanism 4 is arranged in the movable bin 41, and a detection mechanism 5 is arranged on the top of the pressure block 2; the clamping mechanism 3 is assembled to move the rubber placed on the operating table 31 downward by the pressure block 2. The rubber seal is clamped and fixed; the adjusting mechanism 4 is assembled to make appropriate adjustments according to the different specifications of the rubber seal to be inspected before inspection, and the movable block 37 slidably connected to the operating table 31 is squeezed by the downward-moving pressure block 2, so that the adjusting block 411 slidably connected to the top of the operating table 31 moves, and the rubber seal is brought to the center position of the operating table 31; the inspection mechanism 5 is assembled to assist the adjusting mechanism 4 to bring the rubber seal to be inspected to the center position when the pressure block 2 moves downward and abuts against the adjusting mechanism 4, and the sealing of the rubber seal is inspected according to the change of air pressure when the rubber seal is fully clamped.

[0027] In this embodiment, the electromagnet is turned on before use. In the initial state, the top of the movable block 37 is higher than the top of the connecting ring 33. The rubber seal to be tested is placed on the operating table 31. The adjusting blocks 411 are all located inside the inner ring of the rubber seal. The driving device drives the pressing block 2 to move downward, and the pressing block 2 slides on the limiting rod 11. When the operating table 31 coincides with the mold cavity 32, the top of the mold cavity 32 abuts against the top of the movable block 37. The air pump 51 is started, and the gas filled into the movable block 37 by the air pump 51 is discharged outward from the second through hole 310. The movable block 37 is squeezed and moved downward, and the first spring 39 is compressed. When the block 37 moves downward, the driving wheel 44 starts to rotate under the action of the threaded rod 43, and drives the driven wheel 45 to rotate, so that the wire rope 48 is pulled, so that the electromagnet on the top of the slider 49 drives the adjustment block 411 to move, and pushes the rubber seal to the center position of the operating table 31. When the pressing block 2 cannot move further downward, it means that the rubber seal has been clamped, and its top and bottom are respectively against the top of the mold cavity 32 and the top of the operating table 31. The gas filled by the air pump 51 can only reach the hollow position in the middle of the seal. The sealing condition of the seal is judged according to the value change of the air pressure sensor 53.

[0028] like Figure 1-Figure 9 As shown, the clamping mechanism 3 also includes a mold cavity 32 opened at the bottom of the pressing block 2, a connecting ring 33 is threadedly connected to the top of the operating table 31, a group of first through holes 34 are opened on the upper side wall of the connecting ring 33, a group of mounting grooves 35 are opened on the upper inner wall of the connecting ring 33, a movable block 37 is slidably connected in the connecting ring 33, a fixed plate 38 is fixedly connected to the outer wall of the movable block 37, a first spring 39 is fixedly connected to the bottom of the fixed plate 38, and one end of the first spring 39 away from the fixed plate 38 is fixed to the bottom of the mounting groove 35 A second through hole 310 is formed on the upper side wall of the movable block 37; a rubber ring 36 is fixedly connected to the bottom end of the connecting ring 33, and the rubber ring 36 abuts against the inner wall of the operating table 31; the second through hole 310 corresponds to the first through hole 34, and the height of the second through hole 310 is greater than the height of the first through hole 34, and the top of the connecting ring 33 is higher than the top of the operating table 31; the thread on the outside of the connecting ring 33 is located below the first through hole 34, and the length of the internal thread set on the inner wall of the operating table 31 is less than the length of the thread on the outside of the connecting ring 33.

[0029] In this embodiment, when the pressing block 2 moves downward, the pressing block 2 slides on the limiting rod 11, the top of the mold cavity 32 abuts against the top of the movable block 37, the movable block 37 is pressed downward, and the fixed plate 38 slides downward in the mounting groove 35, so that the first spring 39 is compressed, and the height of the second through hole 310 on the movable block 37 is greater than the height of the first through hole 34 on the connecting ring 33. In the initial state, the bottom of the first through hole 34 is flush with the bottom of the second through hole 310. Therefore, when the movable block 37 moves downward, the first through hole 34 always overlaps with the second through hole 310. The minimum thickness of the rubber seal that can be clamped and fixed by the pressing block 2 and the operating table 31 depends on the height of the connecting ring 33 protruding from the top of the operating table 31. When the thickness of the rubber seal is greater than the height of the connecting ring 33 protruding from the top of the operating table 31, after the pressing block 2 presses and fixes the rubber seal, the pressing block 2 does not contact the connecting ring 33, and the top and bottom of the rubber seal are respectively against the top of the mold cavity 32 and the top of the operating table 31. The hollow position in the middle of the rubber seal is in a closed state, and the sealing test can be performed by observing the air pressure sensor 53.

[0030] In this embodiment, if Figure 3-Figure 5 As shown, generally, the larger the inner diameter and outer diameter of the rubber seal, the greater its thickness. For the sealing test of such rubber seals, after testing a rubber seal of one specification, when it is necessary to test rubber seals of other specifications and sizes, the connecting ring 33 is rotated to adjust its height so that the height of the connecting ring 33 extending from the top of the operating table 31 changes. When the connecting ring 33 rotates, the movable block 37 is driven to rotate. At the same time, the height of the movable block 37 changes when it rotates, so that the state of the threaded rod 43 fixedly connected to the movable block 37 changes, driving the driving wheel 44 to rotate, thereby pulling the wire rope 48. While adjusting the height of the connecting ring 33, the model and position of the adjusting block 411 are adjusted (in this embodiment, the height of the adjusting block 411 is set to multiple models) to adapt to the change in the height of the adjusting connecting ring 33 and cooperate with the testing of rubber seals of different specifications and sizes. In the process of adjusting the connecting ring 33, the rubber ring 36 at the lower end of the connecting ring 33 always abuts against the inner wall of the operating table 31 to ensure its sealing and prevent the gas from entering the movable chamber 41 when the air pump 51 is inflated.

[0031] like Figure 3-Figure 11As shown, the adjusting mechanism 4 also includes a threaded rod 43 fixedly connected to the bottom of the movable block 37, a driving wheel 44 is rotatably connected to the bottom of the movable bin 41, a spiral groove 412 is provided on the top of the driving wheel 44, the threaded rod 43 is threadedly connected to the driving wheel 44, a group of slide grooves 42 are provided in the operating table 31, a slider 49 is slidably connected in the slide groove 42, a second spring 410 is fixedly connected to the side of the slide groove 42 close to the center of the operating table 31, and the end of the second spring 410 away from the center of the operating table 31 is fixedly connected to the slider 49; a group of movable shafts 46 are rotatably connected in the movable bin 41, a driven wheel 45 is fixedly connected to the lower end of the movable shaft 46, the driven wheel 45 is meshed with the driving wheel 44, a pulley 47 is fixedly connected to the upper end of the movable shaft 46, a wire rope 48 is fixedly connected to the pulley 47, and the end of the wire rope 48 away from the pulley 47 passes through the inner wall of the operating table 31 and is fixedly connected to the slider 49; an electromagnet is provided on the top of the slider 49, and the adjusting block 411 cooperates with the electromagnet.

[0032] In this embodiment, the movable block 37 moves downward vertically after being squeezed, driving the threaded rod 43 fixedly connected to the bottom of the movable block 37 to move downward. At this time, there is a certain distance between the bottom of the threaded rod 43 and the bottom of the spiral groove 412. Therefore, when the threaded rod 43 moves downward vertically, the driving wheel 44 threadedly connected to the threaded rod 43 and rotatably connected to the operating table 31 will rotate, thereby driving the driven wheel 45 meshing with the driving wheel 44 to rotate, and the movable shaft 46 also rotates under the drive of the driven wheel 45, so that the wire rope 48 wound on the pulley 47 is released. The originally compressed second spring 410 pushes the slider 49 to move to a position away from the center of the operating table 31 after the wire rope 48 is relaxed. Therefore, the electromagnet at the top of the slider 49 drives the adjusting block 411 at the top of the operating table 31 to move. The adjusting blocks 411 all spread outward with the connecting ring 33 as the center. The height of the adjustment block 411 used during the test is always less than the height of the connecting ring 33 protruding from the operating table 31. The space for the movable block 37 to move downward indicates that the pressure block 2 has not yet completely compressed the rubber seal, and there are still conditions for adjustment of the seal. For example, if the rubber seal placed on the operating table 31 is offset, then when the adjustment block 411 spreads outward, part of the adjustment block 411 will first abut against the inner ring of the rubber seal, pushing the seal to the center position of the operating table 31 to facilitate subsequent testing work. After the test, the pressure block 2 moves up, and the first spring 39 drives the movable block 37 to move up and reset. At the same time, the wire rope 48 is reeled up again, so that the slider 49 and the adjustment block 411 are reset. In order to save energy, the device will turn off the electromagnet when not in use and turn it on when in use. During use, the position of the adjustment block 411 can also be adjusted according to usage requirements.

[0033] like Figure 1 and Figure 2As shown, the detection mechanism 5 includes an air pump 51 installed on the top of the pressing block 2, an air inlet 52 is opened at the center of the pressing block 2, the air inlet 52 cooperates with the air pump 51, and an air pressure sensor 53 is fixedly installed on the top of the pressing block 2; the mold cavity 32 cooperates with the operating table 31, and the diameter of the mold cavity 32 is larger than the diameter of the operating table 31.

[0034] In this embodiment, when the top of the mold cavity 32 abuts against the top of the movable block 37, the air pump 51 is turned on to inflate the movable block 37 through the air inlet 52, the second through hole 310 coincides with the first through hole 34, and the gas diffuses to the surroundings through the first through hole 34 and the second through hole 310, impacting the rubber seal, and the auxiliary adjustment mechanism 4 adjusts the position of the rubber seal to make it centered. When the top of the mold cavity 32 abuts against the rubber seal and the pressure block 2 cannot move further downward, the pressure block 2 is controlled to stop moving. At this time, the rubber seal is fixed at the center position of the operating table 31, and the gas exists in the middle hollow position of the seal. The changes in the air pressure sensor 53 are observed. If continuous inflation is required to keep the air pressure value stable, it means that the rubber seal is leaking and the sealing effect is poor.

[0035] Working principle: When in use, place the rubber seal to be tested on the operating table 31, turn on the electromagnet, and when the driving device drives the pressure block 2 to move downward, the top of the mold cavity 32 first contacts the top of the movable block 37, squeezing the movable block 37 downward, so that the driving wheel 44 starts to rotate under the action of the threaded rod 43, and drives the driven wheel 45 engaged with it to rotate, thereby causing the movable shaft 46 to rotate to release the wound wire rope 48, and the compressed second spring 410 pushes the slider 49 to move away from the center of the operating table 31, thereby driving the movement of the adjustment block 411 under the adsorption of the electromagnet. If the rubber seal placed on the operating table 31 is offset, the part closer to the center of the operating table 31 will first contact the adjustment block 411, and each adjustment block 411 moves outward the same distance. The adjustment block 411 that contacts the seal first will push the seal to move, adjust the seal position, and move the seal to the center of the operating table 31. During this process, the air pump 51 Continuously inflate through the air inlet 52, so that the gas diffuses outward from the first through hole 34 and impacts the inner ring of the seal. If the position of the seal is offset, the impact force on the inner ring of the gas seal closer to the connecting ring 33 is greater than the impact force on the seal farther from the connecting ring 33, and the adjusting block 411 is assisted in pushing the seal. When the movable block 37 cannot move further downward, it means that the rubber seal has been clamped and the adjusting block 411 cannot move further. In this state, the middle hollow position of the seal should be in a closed state, and the air pump 51 continues to inflate the interior and observes the air pressure sensor 53. If continuous inflation is required to keep the internal air pressure value in a stable state, it means that the rubber seal is leaking and the sealing is poor. After the test of the rubber seal of this specification and size is completed, if it is necessary to test rubber seals of different specifications and sizes, rotate the connecting ring 33 to adjust its height, and at the same time drive the adjusting block 411 to move its position to adapt to the size of the seal to be tested.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A self-centering rubber seal pressure tightness testing device, comprising a base (1) and a pressure block (2), wherein a set of limit rods (11) are fixedly connected to the top of the base (1), and the pressure block (2) is located on the top of the base (1) and is slidably connected to the limit rods (11), characterized in that: A clamping mechanism (3) is provided on the top of the base (1), the clamping mechanism (3) comprising an operating table (31) fixedly connected to the center of the top of the base (1), a movable bin (41) is provided on the top of the operating table (31), an adjustment mechanism (4) is provided in the movable bin (41), and a detection mechanism (5) is provided on the top of the pressing block (2); A clamping mechanism (3) is configured to clamp and fix a rubber seal placed on an operating table (31) by moving the pressing block (2) downward; The adjusting mechanism (4) is assembled so as to be appropriately adjusted according to the different specifications of the rubber seal to be tested before testing, and the movable block (37) slidably connected to the operating table (31) is pressed by the downwardly moving pressing block (2), so that the adjusting block (411) slidably connected to the top of the operating table (31) moves, thereby bringing the rubber seal to the center position of the operating table (31); The detection mechanism (5) is arranged so that when the pressure block (2) moves downward and abuts against the adjustment mechanism (4), the auxiliary adjustment mechanism (4) brings the rubber seal to be detected to a central position, and performs a sealing test on the rubber seal according to the change in air pressure when the rubber seal is fully clamped.

2. The self-centering rubber seal pressure tightness testing device according to claim 1, characterized in that: The clamping mechanism (3) further comprises a mold cavity (32) formed at the bottom of the pressing block (2); a connecting ring (33) is threadedly connected to the top of the operating table (31); a group of first through holes (34) are formed on the upper side wall of the connecting ring (33); a group of mounting grooves (35) are formed on the upper inner wall of the connecting ring (33); a movable block (37) is slidably connected inside the connecting ring (33); a fixed plate (38) is fixedly connected to the outer wall of the movable block (37); a first spring (39) is fixedly connected to the bottom of the fixed plate (38); an end of the first spring (39) away from the fixed plate (38) is fixedly connected to the bottom of the mounting groove (35); and a second through hole (310) is formed on the upper side wall of the movable block (37).

3. The self-centering rubber seal pressure tightness testing device according to claim 2, characterized in that: A rubber ring (36) is fixedly connected to the bottom end of the connecting ring (33), and the rubber ring (36) abuts against the inner wall of the operating table (31).

4. The self-centering rubber seal pressure tightness testing device according to claim 3, characterized in that: The second through hole (310) corresponds to the first through hole (34), and the height of the second through hole (310) is greater than the height of the first through hole (34), and the top of the connecting ring (33) is higher than the top of the operating table (31).

5. The self-centering rubber seal pressure tightness testing device according to claim 2, characterized in that: The adjusting mechanism (4) further comprises a threaded rod (43) fixedly connected to the bottom of the movable block (37); a driving wheel (44) is rotatably connected to the bottom of the movable bin (41); a spiral groove (412) is formed on the top of the driving wheel (44); the threaded rod (43) is threadedly connected to the driving wheel (44); a group of slide grooves (42) are formed in the operating table (31); a slider (49) is slidably connected to the slide grooves (42); a second spring (410) is fixedly connected to one side of the slide groove (42) close to the center of the operating table (31); and an end of the second spring (410) away from the center of the operating table (31) is fixedly connected to the slider (49).

6. The self-centering rubber seal pressure tightness testing device according to claim 5, characterized in that: A group of movable shafts (46) are rotatably connected in the movable bin (41); a driven wheel (45) is fixedly connected to the lower end of the movable shaft (46); the driven wheel (45) is meshed with the driving wheel (44); a pulley (47) is fixedly connected to the upper end of the movable shaft (46); a steel wire rope (48) is fixedly connected to the pulley (47); an end of the steel wire rope (48) away from the pulley (47) passes through the inner wall of the operating table (31) and is fixedly connected to the slider (49).

7. The self-centering rubber seal pressure tightness testing device according to claim 6, characterized in that: An electromagnet is arranged on the top of the sliding block (49), and the adjusting block (411) cooperates with the electromagnet.

8. The self-centering rubber seal pressure tightness testing device according to claim 1, characterized in that: The detection mechanism (5) comprises an air pump (51) mounted on the top of the pressing block (2); an air inlet (52) is provided at the center of the pressing block (2); the air inlet (52) cooperates with the air pump (51); and an air pressure sensor (53) is fixedly mounted on the top of the pressing block (2).

9. The self-centering rubber seal pressure tightness testing device according to claim 2, characterized in that: The mold cavity (32) matches the operating table (31), and the diameter of the mold cavity (32) is greater than the diameter of the operating table (31).

10. The self-centering rubber seal pressure tightness testing device according to claim 2, characterized in that: The thread on the outside of the connecting ring (33) is located below the first through hole (34), and the length of the internal thread arranged on the inner wall of the operating table (31) is smaller than the length of the thread on the outside of the connecting ring (33).

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