A pneumatically controlled threaded hole quick sealing device

Abstract

This invention discloses a pneumatically controlled rapid sealing device for threaded holes, comprising a high-pressure chamber assembly and a low-pressure chamber assembly connected front to back. The high-pressure chamber assembly includes a high-pressure chamber body with a front sliding hole through which an elastic clamp slides. The head of the elastic clamp has an external threaded sealing head that engages with the threaded hole of the workpiece when the clamp expands. The low-pressure chamber assembly includes a low-pressure chamber body, a low-pressure piston, and a push rod. The rear end of the push rod is connected to the piston rod of the low-pressure piston, and the front end is movably inserted into the inner hole of the elastic clamp. The low-pressure piston slides forward, sequentially driving the push rod forward and causing the elastic clamp to expand. Because the external threaded sealing head of the elastic clamp engages with the inner thread of the workpiece's threaded hole after expansion, rapid connection can be achieved without rotation.

Description

Technical Field

[0001] This invention belongs to the field of automatic testing of assembly sealing performance. Background Technology

[0002] The existing high-pressure test pipeline has an internally threaded connection port, which needs to be sealed during assembly sealing tests. The conventional method uses an externally threaded plug to connect with the internally threaded connection port. Rotating the externally threaded plug to complete the threaded connection and reliably seal the connection is time-consuming, labor-intensive, and inefficient. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a pneumatically controlled threaded hole quick sealing device to solve the problem of low efficiency in the process of testing the internal thread connection of high pressure pipeline.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A pneumatically controlled threaded hole quick sealing device includes a high-pressure chamber assembly and a low-pressure chamber assembly connected front and rear. The high-pressure chamber assembly includes a high-pressure chamber body, an elastic clamp, and an isolation piston. The high-pressure chamber body has a high-pressure air chamber in the middle, a high-pressure air inlet communicating with the high-pressure air chamber, a front sliding hole in the front of the high-pressure chamber body, and a rear sliding hole in the rear of the high-pressure chamber body. The elastic clamp slides through the front sliding hole, and the isolation piston is slidably connected to the rear sliding hole. The head of the elastic clamp is provided with an external threaded sealing head that engages with the threaded hole of the workpiece when the elastic clamp expands. The rear of the elastic clamp is connected to the isolation piston. A conical contraction drive structure is provided between the middle of the elastic clamp and the rear end of the front sliding hole. When the isolation piston pushes the elastic clamp forward, the conical contraction drive structure drives the elastic clamp to contract forcibly.

[0006] The low-pressure chamber assembly includes a low-pressure chamber body, a low-pressure piston, and a push rod. The low-pressure chamber body has a low-pressure piston chamber and a locking air inlet communicating with the low-pressure piston chamber. The low-pressure piston is located inside the low-pressure piston chamber. The rear end of the push rod is connected to the piston rod of the low-pressure piston. The middle part of the push rod moves through the isolation piston, and the front part of the push rod moves into the inner hole of the elastic expansion clamp. Air is introduced into the low-pressure piston chamber through the locking air inlet to push the low-pressure piston to slide forward, and in turn drive the push rod to move forward, and the push rod drives the elastic expansion clamp to expand.

[0007] Preferably, a limiting retainer is provided between the high-pressure chamber body and the low-pressure chamber body, and a central through hole is provided in the center of the limiting retainer, and the piston rod of the low-pressure piston is movably inserted into the central through hole.

[0008] Preferably, the low-pressure chamber assembly further includes a return spring disposed in the low-pressure piston chamber and located on the front side of the piston body of the low-pressure piston, the return spring being used to realize the retraction of the low-pressure piston.

[0009] Preferably, the limiting retainer has a rearwardly extending cylindrical protrusion, and the low-pressure chamber assembly further includes a return piston located on the front side of the low-pressure piston chamber, the return piston being movably sleeved on the cylindrical protrusion and elastically abutting against the front end of the return spring.

[0010] Preferably, the piston rod outer ring of the low-pressure piston is provided with a locking groove, the inner ring of the return piston is provided with a locking ball receiving groove corresponding to the locking groove, and the cylindrical protrusion is provided with a limiting retaining hole corresponding to the locking groove. The locking ball receiving groove and the limiting retaining hole cooperate to position the locking ball. When the push rod moves forward and the locking groove corresponds to the position of the limiting retaining hole, the elastic clamp expands, the locking ball disengages from the locking ball receiving groove and is positioned between the limiting retaining hole and the locking groove, thereby locking the piston rod of the low-pressure piston.

[0011] Preferably, the low-pressure chamber body is provided with a release air intake passage, and the release air intake passage is provided with a release air inlet; when the detection is completed and the chamber retracts, the air inlet is locked to release pressure, the air inlet is released to allow air to enter, and the return piston and the low-pressure piston are pushed back through the release air intake passage.

[0012] Preferably, the threaded hole quick sealing device is further provided with a position sensor that detects the position of the low-pressure piston, and determines whether the thread is connected in place based on the position of the low-pressure piston.

[0013] Preferably, the position sensor includes a magnetic ring mounted on the low-pressure piston and a magnetic induction switch for sensing the magnetic ring, the magnetic induction switch being used to detect the position of the magnetic ring.

[0014] Preferably, the outer ring of the isolation piston is provided with an outer sealing groove, and a sealing ring is provided in the outer sealing groove to slide and seal with the rear sliding hole.

[0015] Preferably, the inner ring of the isolation piston is provided with a sealing ring that slides and seals with the push rod.

[0016] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0017] 1. Low-pressure gas is introduced into the low-pressure piston chamber through the locking air inlet to push the low-pressure piston forward and drive the push rod forward. The front part of the push rod slides forward along the inner hole of the elastic clamp and pushes open the elastic clamp. The external thread sealing head of the elastic clamp expands and engages with the internal thread of the workpiece thread hole, achieving the purpose of quick thread connection without rotation, thus improving the efficiency of pipeline connection in the automated testing process of high-pressure test pipelines.

[0018] 2. The two ends of the limiting retainer abut against the high-pressure chamber body and the low-pressure chamber body respectively, thereby achieving the limiting function of the entire sealing device, that is, the limiting between the high-pressure chamber assembly and the low-pressure chamber assembly.

[0019] 3. The return spring and return piston work together to retract the low-pressure piston when the detection is completed, until all parts have retracted, thus avoiding the situation where the retraction is incomplete.

[0020] 4. When the push rod moves forward and the locking groove corresponds to the position of the limiting retaining hole, the elastic clamp expands, the locking ball disengages from the locking ball receiving groove and is positioned between the limiting retaining hole and the locking groove, thereby locking the piston rod of the low-pressure piston, thus achieving the effect of axially locking the piston rod. It will remain locked in the locked state without applying return air pressure, ensuring that the push rod does not move backward under the action of high pressure air in the high-pressure chamber.

[0021] 5. When the test is completed and the device is returned, the pressure in the high-pressure chamber is released, the air inlet is locked to release pressure, the air inlet is loosened to build up pressure, the isolation piston is moved forward through the internal air passage, the elastic expansion clamp is forced to contract through the conical contraction drive structure, and then automatically returns to its original position with the assistance of the elastic contraction ring, releasing the lock with the threaded hole of the workpiece, and the return piston and low-pressure piston are pushed back by loosening the air inlet passage.

[0022] 6. A position sensor is used to detect the position of the low-pressure piston. The position of the low-pressure piston is used to determine whether the thread is properly connected, so as to prevent accidents during high-pressure charging due to improper thread connection.

[0023] 7. The main advantages of magnetic induction switches are strong anti-interference ability, good waterproof performance, long operating distance, and high temperature resistance. Therefore, position sensors use a combination of magnetic rings and magnetic induction switches.

[0024] 8. The high-pressure gas chamber and the low-pressure piston chamber are separated by an isolation piston. In order to ensure the sealing of the radial outer side of the isolation piston, the outer ring of the isolation piston is provided with an outer sealing groove, and a sealing ring is provided in the outer sealing groove. The sealing ring slides and seals with the rear sliding hole, thus having a good sealing effect.

[0025] Similarly, in order to ensure the sealing of the radial inner side of the isolating piston, the inner ring of the isolating piston and the push rod slide and seal together, so a sealing ring is used for sealing.

[0026] The specific technical solution of the present invention and its beneficial effects will be described in detail in the following specific embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0028] Figure 1This is a cross-sectional view of a pneumatically controlled threaded hole quick sealing device of the present invention in the elastically expanded clamp state.

[0029] Figure 2 This is a cross-sectional view of a pneumatically controlled threaded hole quick sealing device of the present invention in an elastic expansion and contraction state.

[0030] In the diagram: 1. Elastic clamp; 2. High-pressure chamber body; 3. Push rod; 4. High-pressure air inlet; 5. Isolation piston; 6. Spacer; 7. Limiting retainer; 8. Locking steel ball; 9. Return piston; 10. Return spring; 11. Low-pressure piston; 12. Magnetic ring; 13. Low-pressure chamber body; 14. Release air inlet; 15. Lock air inlet; 16. Magnetic induction switch. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0033] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "front," "rear," "inner," and "outer," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] This invention addresses the problem of low efficiency in existing high-pressure pipeline connection processes. Based on this, it provides a pneumatically controlled threaded hole rapid sealing device, such as... Figure 1 and Figure 2 As shown, the assembly includes a high-pressure chamber assembly and a low-pressure chamber assembly connected front to back. The high-pressure chamber assembly includes a high-pressure chamber body 2, an elastic clamp 1, and an isolation piston 5. The high-pressure chamber body 2 has a high-pressure air chamber located in its center, a high-pressure air inlet 4 communicating with the high-pressure air chamber, a high-pressure release hole, a front sliding hole located at the front of the high-pressure chamber body, and a rear sliding hole located at the rear of the high-pressure chamber body. The front sliding hole, the high-pressure air chamber, and the rear sliding hole are sequentially connected. The elastic clamp 1 slides through the front sliding hole, and the isolation piston 5 is slidably connected to the rear sliding hole. The head of the elastic clamp 1 has an external threaded sealing head that engages with the threaded hole of the workpiece when the elastic clamp expands. The rear of the elastic clamp is connected to the isolation piston, and a tapered contraction structure is provided between the middle of the elastic clamp and the rear end of the front sliding hole.

[0037] The head of the elastic expansion clamp is equipped with an external threaded sealing head, which can engage with the internal thread of the workpiece when the elastic expansion clamp is opened.

[0038] The low-pressure chamber assembly includes a low-pressure chamber body 13, a low-pressure piston 11, and a push rod 3. The low-pressure chamber body 13 has a low-pressure piston cavity and a locking air inlet 15 communicating with the low-pressure piston cavity. The low-pressure piston 11 is located inside the low-pressure piston cavity. The rear end of the push rod 3 is connected to the piston rod of the low-pressure piston 11, specifically by a threaded connection. The middle part of the push rod moves through the isolation piston 5 and is sealed, while the front part of the push rod moves into the inner hole of the elastic expansion clamp. Air is introduced into the low-pressure piston cavity through the locking air inlet to push the low-pressure piston forward, which in turn drives the push rod forward and causes the elastic expansion clamp to expand.

[0039] The elastic expansion clamp can refer to existing elastic expansion clamp structures, consisting of multiple circumferentially distributed jaws forming a hollow structure in the middle. Elastic contraction rings, such as O-rings, are fitted around the jaws to maintain the elastic expansion clamp in a contracted state. The inner front side of the elastic expansion clamp has an inner conical surface, and the front of the push rod has an outer conical surface, which together form a conical contraction structure. When the push rod 3 moves forward, the outer conical surface engages with the inner conical surface, driving the elastic expansion clamp 1 to expand.

[0040] During testing, low-pressure gas is introduced into the low-pressure piston chamber through the locking air inlet to push the low-pressure piston forward and drive the push rod forward. The front part of the push rod slides forward along the inner hole of the elastic clamp and pushes open the elastic clamp. The external threaded sealing head of the elastic clamp expands and engages with the internal thread of the workpiece threaded hole, achieving the purpose of quick thread connection without rotation, thus improving the efficiency of pipeline connection in the automated testing process of high-pressure test pipelines.

[0041] When the test is completed and the device is returned, the pressure in the high-pressure chamber is released, the air inlet 15 is locked to release the pressure, and the isolation piston 5 is moved forward through the internal air passage. When the isolation piston pushes the elastic clamp 1 forward, the elastic clamp is forced to contract through the conical contraction structure, and then automatically returns to its original position with the assistance of the elastic contraction ring, releasing the thread lock with the workpiece thread hole.

[0042] like Figure 1 As shown, a limiting retainer 7 is provided between the high-pressure chamber body 2 and the low-pressure chamber body 13. The limiting retainer 7 has a central through hole, into which the piston rod of the low-pressure piston is movably inserted. The two ends of the limiting retainer abut against the high-pressure chamber body 2 and the low-pressure chamber body 13 respectively, thereby achieving the limiting function of the entire sealing device, i.e., limiting the distance between the high-pressure chamber assembly and the low-pressure chamber assembly. Specifically, the rear of the high-pressure chamber body has a threaded portion, and the front of the low-pressure chamber body has an internally threaded hole, with the threaded portion threaded into the internally threaded hole. The rear of the high-pressure chamber body has an outer stepped portion in front of the threaded portion, and the front end of the low-pressure chamber body abuts against the stepped portion, with a sealing ring between them. The front of the low-pressure chamber body has an inner stepped portion behind the internally threaded hole, and the limiting retainer is positioned on the inner stepped portion and abuts against the rear end of the high-pressure chamber body.

[0043] To ensure the low-pressure piston returns to its original position, the low-pressure chamber assembly also includes a return spring 10 disposed in the low-pressure piston chamber and located on the front side of the piston body of the low-pressure piston. The return spring is used to realize the retraction of the low-pressure piston.

[0044] Furthermore, the limiting retainer 7 has a rearwardly extending cylindrical protrusion, and the low-pressure chamber assembly also includes a return piston 9 located on the front side of the low-pressure piston chamber. The return piston 9 is movably sleeved on the cylindrical protrusion and elastically abuts against the front end of the return spring. The rear part of the return piston has a spring mounting stepped hole, which cooperates with the front part of the return spring, and the rear end of the return spring abuts against the front end of the piston body of the low-pressure piston. The return spring and the return piston cooperate to realize the retraction of the low-pressure piston when the detection is completed and the piston retracts, until all components are retracted, avoiding the situation where the retraction is not in place.

[0045] To overcome the high-pressure reaction force and prevent the low-pressure piston rod from retracting during testing, the low-pressure chamber assembly is also equipped with a locking mechanism. Specifically, such as... Figure 1 and Figure 2 As shown, the outer ring of the piston rod of the low-pressure piston is provided with a locking groove, and the inner ring of the return piston is provided with a locking ball receiving groove corresponding to the locking groove. The cylindrical protrusion is provided with a limiting retaining hole corresponding to the locking groove. The locking ball receiving groove and the limiting retaining hole cooperate to position the locking ball. When the push rod moves forward and the locking groove corresponds to the position of the limiting retaining hole, the elastic clamp expands, and the locking ball disengages from the locking ball receiving groove and is positioned between the limiting retaining hole and the locking groove, thereby locking the piston rod of the low-pressure piston. The return piston 9 moves forward under the reaction of the return spring 10. The locking ball can be a locking steel ball 8. In this way, during testing, the locking mechanism locks the piston rod of the low-pressure piston, thereby achieving the effect of axially locking the piston rod. It will remain locked in the locked state without applying return air pressure, ensuring that the push rod does not retract under the action of high-pressure air in the high-pressure chamber.

[0046] Furthermore, the low-pressure chamber body 13 is provided with a release air intake passage, which has a release air inlet 14. When the detection is completed and the chamber retracts, the locking air inlet 15 is depressurized, the release air inlet 14 is opened to allow air in, and the release air intake passage pushes the return piston and the low-pressure piston back. Specifically, the return piston 9 returns to its original position, moves backward 2.5 mm, and then passes through the external vent groove, simultaneously pushing the low-pressure piston 11 backward until all components have retracted.

[0047] Furthermore, the threaded hole quick-sealing device is also equipped with a position sensor that detects the position of the low-pressure piston, determining whether the thread is properly connected based on the low-pressure piston's position. This prevents accidents during high-pressure charging due to improper thread connection. Specifically, the position sensor includes a magnetic ring 12 and a magnetic induction switch 16 mounted on the low-pressure piston. The magnetic induction switch detects the position of the magnetic ring to detect the position of the low-pressure piston rod, thereby determining whether the thread is properly connected. The main advantages of the magnetic induction switch are strong anti-interference capability, good waterproof performance, long operating distance, and high temperature resistance.

[0048] A high-pressure gas chamber and a low-pressure piston chamber are separated by an isolation piston. To ensure the sealing of the radially outer side of the isolation piston, the outer ring of the isolation piston is provided with an outer sealing groove. O-rings and rectangular sealing rings are arranged axially side-by-side within the outer sealing groove, slidingly sealing with the rear sliding hole, thus achieving a good sealing effect. Similarly, to ensure the sealing of the radially inner side of the isolation piston, the inner ring of the isolation piston slides and seals with the push rod, so an O-ring seal is used. For ease of processing, an inner spacer 6 and an inner retaining spring are used to fix the O-rings. Specifically, the inner ring of the isolation piston has a positioning step, on which an O-ring is placed. The inner ring of the isolation piston has an inner retaining spring spaced apart from the positioning step, and an inner spacer 6 is provided between the O-ring and the inner retaining spring.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A pneumatically controlled rapid sealing device for threaded holes, characterized in that, The system includes a high-pressure chamber assembly and a low-pressure chamber assembly connected front to back. The high-pressure chamber assembly includes a high-pressure chamber body, an elastic clamp, and an isolation piston. The high-pressure chamber body has a high-pressure air chamber in the middle, a high-pressure air inlet communicating with the high-pressure air chamber, a front sliding hole at the front of the high-pressure chamber body, and a rear sliding hole at the rear of the high-pressure chamber body. The elastic clamp slides through the front sliding hole, and the isolation piston is slidably connected to the rear sliding hole. The head of the elastic clamp is provided with an external threaded sealing head that engages with the threaded hole of the workpiece when the elastic clamp expands. The rear of the elastic clamp is connected to the isolation piston. A conical contraction drive structure is provided between the middle of the elastic clamp and the rear end of the front sliding hole. When the isolation piston pushes the elastic clamp forward, the conical contraction drive structure drives the elastic clamp to contract forcibly. The low-pressure chamber assembly includes a low-pressure chamber body, a low-pressure piston, and a push rod. The low-pressure chamber body has a low-pressure piston chamber and a locking air inlet communicating with the low-pressure piston chamber. The low-pressure piston is located inside the low-pressure piston chamber. The rear end of the push rod is connected to the piston rod of the low-pressure piston. The middle part of the push rod moves through the isolation piston, and the front part of the push rod moves into the inner hole of the elastic expansion clamp. Air is introduced into the low-pressure piston chamber through the locking air inlet to push the low-pressure piston to slide forward, which in turn drives the push rod to move forward and drives the elastic expansion clamp to expand. A limiting retainer is provided between the high-pressure chamber body and the low-pressure chamber body. The limiting retainer has a central through hole. The piston rod of the low-pressure piston is movably inserted into the central through hole. The low-pressure chamber assembly also includes a return spring located in the low-pressure piston cavity and in front of the piston body of the low-pressure piston. The return spring is used to realize the retraction of the low-pressure piston. The limiting retainer has a rearwardly extending cylindrical protrusion. The low-pressure chamber assembly also includes a return piston located in front of the low-pressure piston cavity. The return piston is movably sleeved on the cylindrical protrusion and elastically abuts against the front end of the return spring.

2. The pneumatically controlled threaded hole quick-sealing device according to claim 1, characterized in that, The piston rod outer ring of the low-pressure piston is provided with a locking groove, and the inner ring of the return piston is provided with a locking ball receiving groove corresponding to the locking groove. The cylindrical protrusion is provided with a limiting retaining hole corresponding to the locking groove. The locking ball receiving groove and the limiting retaining hole cooperate to position the locking ball. When the push rod moves forward and the locking groove corresponds to the position of the limiting retaining hole, the elastic clamp expands, and the locking ball is disengaged from the locking ball receiving groove and positioned between the limiting retaining hole and the locking groove, thereby locking the piston rod of the low-pressure piston.

3. The pneumatically controlled threaded hole quick-sealing device according to claim 2, characterized in that, The low-pressure chamber body is provided with a release air intake passage, and the release air intake passage is provided with a release air inlet; when the detection is completed and the chamber is retracted, the air inlet is locked to release pressure, the air inlet is released to allow air to enter, and the release air intake passage pushes the return piston and the low-pressure piston to retract.

4. The pneumatically controlled threaded hole quick-sealing device according to claim 1, characterized in that, The threaded hole quick sealing device is also equipped with a position sensor that detects the position of the low-pressure piston, and determines whether the thread is connected in place based on the position of the low-pressure piston.

5. A pneumatically controlled threaded hole quick-sealing device according to claim 4, characterized in that, The position sensor includes a magnetic ring mounted on a low-pressure piston and a magnetic induction switch for sensing the magnetic ring, the magnetic induction switch being used to detect the position of the magnetic ring.

6. A pneumatically controlled threaded hole quick-sealing device according to claim 1, characterized in that, The outer ring of the isolation piston is provided with an outer sealing groove, and a sealing ring that slides and seals with the rear sliding hole is provided in the outer sealing groove.

7. A pneumatically controlled threaded hole quick-sealing device according to claim 1, characterized in that, The inner ring of the isolation piston is provided with a sealing ring that slides and seals with the push rod.

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