Internal expansion extrusion sealing mechanism

Abstract

The utility model provides an internal expansion extrusion sealing mechanism. The internal expansion extrusion sealing mechanism comprises a driving assembly, a core pulling mechanism and an internal expansion sealing ring, the core-pulling structure comprises a core-pulling cylinder barrel, a core-pulling shaft and an internal expansion sealing ring locking piece; the core pulling shaft is arranged in the core pulling cylinder barrel and can move in the core pulling cylinder barrel; the internal expansion sealing ring locking piece is fixedly connected with a measured object; the internal expansion sealing ring is arranged between the core-pulling cylinder barrel and the internal expansion sealing ring locking piece; the driving assembly is used for driving the core pulling shaft to move in the core pulling cylinder barrel, and the core pulling shaft can drive the core pulling cylinder barrel to extrude the inner expansion sealing ring. The shape of the sealing ring can be changed at will through the core pulling mechanism, so that the sealing ring expands inwards, the situation that the hole is scratched in the vertical distance direction when the sealing ring is placed in the hole is avoided, the internal expansion sealing ring and the internal expansion sealing ring tool are matched more tightly, and internal expansion and extrusion sealing are generated under the influence of external acting force.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing mechanisms, in particular to an internal expansion and extrusion sealing mechanism, in particular to a micro porous internal expansion and extrusion sealing mechanism, in particular to an internal expansion and extrusion nitrile rubber sealing mechanism. Background Art

[0002] Nitrile rubber sealing ring has a simple sealing structure, compact installation location, light weight, and self-sealing function. Often only one seal is needed to achieve the sealing effect, so it is widely used in various leak detection and sealing mechanisms.

[0003] The existing popular sealing rings and sealing ring tools on the market are either regular circles matched with circles, or regular squares matched with squares, which are easy to fall off when subjected to external forces. The popular sealing ring tools on the market are either over-pressurized, or the diameter of the sealing ring is close to the size of the leak detection workpiece, which causes the sealing ring to wear too quickly, resulting in a short life of the sealing ring, low production efficiency and other problems, which seriously affects product costs.

[0004] The internal expansion extrusion sealing mechanism of the utility model is not easy to fall off because the length of the sealing ring is limited by the internal expansion sealing ring locking piece and the core pulling cylinder. When the sealing ring expands internally, it will become longer, so that the sealing ring fits more tightly and is not easy to fall off. The internal expansion extrusion sealing mechanism of the utility model adopts the internal expansion method. The hole of the tested product is large and the diameter of the sealing ring is small. After reaching the test position, the sealing ring expands internally to meet the sealing requirements. The matching requirement is a clearance match. The single-sided amount is controlled to be above 0.5, which is equivalent to a 1mm smaller diameter of the hole and the sealing ring. The sealing ring contacts the product only when it is in effect. When it is not in effect, the sealing ring and the product are not in contact. Therefore, the utilization rate of the sealing ring is greatly improved, thereby increasing the service life of the sealing ring.

[0005] The patent document with publication number CN103528471A discloses a small hole center tensioning and positioning mechanism, including a tensioning head, a top shaft, a tensioning fixed seat, an adjustment washer, a measuring workbench, a floating joint and a cylinder; the tensioning head is pressed on the tensioning fixed seat and fixed by a first screw, the tensioning fixed seat is pressed on the measuring workbench and fixed by a second screw, an adjustment washer is installed between the tensioning fixed seat and the top shaft, and the tensioning amount of the tensioning head can be adjusted; the lower end of the top shaft is connected to the floating joint by a thread, the floating joint is connected to the cylinder, a first locking nut is installed between the top shaft and the floating joint; a second locking nut is installed between the floating joint and the cylinder. However, the above patent document still has the defect of being easy to fall off when subjected to external forces. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide an internal expansion extrusion sealing mechanism.

[0007] According to the utility model, an internal expansion extrusion sealing mechanism is provided, comprising: a driving component, a core pulling mechanism and an internal expansion sealing ring;

[0008] The core pulling structure comprises a core pulling cylinder, a core pulling shaft and an inner expansion sealing ring locking member; the core pulling shaft is arranged in the core pulling cylinder, and the core pulling shaft can move in the core pulling cylinder; the inner expansion sealing ring locking member is connected and fixed to the object to be measured;

[0009] The inner expansion sealing ring is arranged between the core pulling cylinder and the inner expansion sealing ring locking piece; the driving assembly is used to drive the core pulling shaft to move in the core pulling cylinder, and the core pulling shaft can drive the core pulling cylinder to squeeze the inner expansion sealing ring.

[0010] Preferably, the internal expansion and extrusion sealing mechanism further includes a core pulling mechanism mounting plate;

[0011] The core pulling structure is arranged on the core pulling mechanism mounting plate, and the core pulling shaft is connected to the core pulling mechanism mounting plate;

[0012] The driving assembly can drive the core pulling mechanism mounting plate to move.

[0013] Preferably, the core pulling structure further includes a self-centering spring base, a core pulling mechanism self-centering spring, a cylinder mounting base and a core pulling mechanism extension rod;

[0014] The cylinder mounting base is connected to the core-pulling cylinder, the self-centering spring base is arranged on the core-pulling mechanism mounting plate, and the core-pulling mechanism self-centering spring is arranged between the self-centering spring base and the cylinder mounting base;

[0015] One end of the core pulling mechanism extension rod passes through the core pulling mechanism self-centering spring and is connected to the self-centering spring base; the other end of the core pulling mechanism extension rod passes through the cylinder mounting base to drive the core pulling shaft to move.

[0016] Preferably, the core-pulling cylinder is provided with an air pipe joint;

[0017] A piston structure is provided on the core-pulling shaft, and a piston tensioning spring is provided between the core-pulling mechanism extension rod and the piston structure;

[0018] When the air pipe joint is connected to the air source, the piston structure drives the core-pulling shaft to generate a pulling force on the inner expansion sealing ring locking piece, so that the core-pulling cylinder and the inner expansion sealing ring locking piece generate an extrusion force on the inner expansion sealing ring.

[0019] Preferably, a first piston sealing ring is provided between the piston structure and the inner side wall of the core-pulling cylinder;

[0020] A second piston sealing ring is provided between the core-pulling shaft and the inner side wall of the core-pulling cylinder;

[0021] The air inlet position of the air pipe joint is located between the first piston sealing ring and the second piston sealing ring.

[0022] Preferably, the core-pulling mechanism further comprises a core-pulling mechanism supporting bottom plate;

[0023] The core pulling mechanism support bottom plate is provided with a linear guide rail, and the linear guide rail is provided with a guide rail slider;

[0024] The core pulling mechanism mounting plate is connected to the guide rail slider, and the core pulling mechanism mounting plate moves on the linear guide rail through the guide rail slider.

[0025] Preferably, the core pulling mechanism supporting bottom plate is provided with core pulling mechanism fastening screws and core pulling mechanism positioning pins.

[0026] Preferably, the drive assembly comprises a drive cylinder and a drive cylinder mounting plate;

[0027] The driving cylinder is arranged on the driving cylinder mounting plate, and the driving end of the driving cylinder can drive the core pulling mechanism mounting plate to move;

[0028] A floating joint is arranged on the driving shaft of the driving cylinder.

[0029] Preferably, a guide rod is provided between the driving cylinder mounting plate and the core pulling mechanism mounting plate;

[0030] One end of the guide rod is connected to the driving cylinder mounting plate through the linear bearing, and the other end of the guide rod is connected to the core pulling mechanism mounting plate;

[0031] The guide rod is used for guiding the core pulling mechanism mounting plate during its movement.

[0032] Preferably, the driving cylinder mounting plate is provided with cylinder mounting plate fastening screws.

[0033] Compared with the prior art, the utility model has the following beneficial effects:

[0034] 1. The utility model has a simple structure and is easy to operate. The shape of the inner expansion sealing ring can be changed at will through the core pulling mechanism, so that the sealing ring can be expanded inwardly, and the shape of the inner expansion sealing ring can be determined according to the product, avoiding scratches in the vertical distance direction of the hole. Under the influence of external forces, internal expansion and extrusion sealing are generated, so that the fit between the inner expansion sealing ring and the inner expansion sealing ring tooling becomes tighter with use; because the sealing ring and the hole of the utility model are clearance fit, there is no scratch in the vertical direction and the aperture direction. As the number of times the sealing ring expands inwardly increases, the axial direction will become longer, while the inner expansion sealing ring locking piece and the core pulling cylinder are fixed, so it will become tighter with use.

[0035] 2. The utility model fixes the sealing ring locking nut. When the driving cylinder moves forward, if the front end hole of the sealing ring locking nut is a blind hole, the inner expansion sealing ring can be squeezed to expand further, thereby achieving a better sealing effect.

[0036] 3. The utility model is provided with a piston tightening spring inside the core pulling cylinder, and two sealing rings are provided at both ends of the core pulling shaft inside the core pulling cylinder, and an air pipe joint is provided between the two sealing rings. The air pipe joint moves forward under the force of the external air source, and returns to its original position through the piston tightening spring behind the core pulling shaft when the force of the external air source is lost. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0038] Figure 1 It is a schematic diagram of the overall structure of the internal expansion and extrusion sealing mechanism of the utility model;

[0039] Figure 2 It is a cross-sectional view of the core pulling mechanism of the utility model;

[0040] Figure 3 It is a schematic diagram of the center and center isometric view of the internal expansion and extrusion sealing mechanism of the utility model.

[0041] The figure shows:

[0042] Drive cylinder mounting plate 1 Core pulling mechanism positioning pin 15

[0043] Floating joint 2 Core pulling mechanism support base plate 16

[0044] Core pulling mechanism mounting plate 3 Cylinder mounting plate fastening screw 17

[0045] Self-centering spring base 4 Drive cylinder 18

[0046] Core pulling mechanism self-centering spring 5 Guide rod 19

[0047] Cylinder mounting base 6 Linear bearing 20

[0048] Pull-out cylinder lock nut 7 Pull-out shaft 21

[0049] Core pulling cylinder 8 First piston seal ring 22

[0050] Air pipe joint 9 Second piston seal ring 23

[0051] Inner expansion seal ring 10 Core pulling mechanism extension rod 24

[0052] Inner expansion seal ring locking piece 11 Piston top spring 25

[0053] Linear guide 12 Floating joint lock nut 26

[0054] Guide rail slider 13 Piston structure 27

[0055] Core pulling mechanism fastening screw 14 DETAILED DESCRIPTION

[0056] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0057] Embodiment 1:

[0058] like Figures 1 to 3 As shown, this embodiment provides an internal expansion extrusion sealing mechanism, including: a driving assembly, a core pulling mechanism and an internal expansion sealing ring 10; the core pulling structure includes a core pulling cylinder 8, a core pulling shaft 21 and an internal expansion sealing ring locking piece 11; the core pulling shaft 21 is arranged in the core pulling cylinder 8, and the core pulling shaft 21 can move in the core pulling cylinder 8; the internal expansion sealing ring locking piece 11 is connected and fixed to the object to be tested; the internal expansion sealing ring 10 is arranged between the core pulling cylinder 8 and the internal expansion sealing ring locking piece 11; the driving assembly is used to drive the core pulling shaft 21 to move in the core pulling cylinder 8, and the core pulling shaft 21 can drive the core pulling cylinder 8 to squeeze the internal expansion sealing ring 10. The internal expansion sealing ring locking piece 11 is a locking nut. The mechanism of this embodiment is suitable for sealing tests of single holes, double holes, three holes and more than three holes, and is suitable for micro-porous tests.

[0059] The inner expansion and extrusion sealing mechanism also includes a core pulling mechanism mounting plate 3; the core pulling structure is arranged on the core pulling mechanism mounting plate 3, and the core pulling shaft 21 is connected to the core pulling mechanism mounting plate 3; the driving assembly can drive the core pulling mechanism mounting plate 3 to move. The core mechanism also includes a core pulling mechanism supporting base plate 16; a linear guide rail 12 is arranged on the core pulling mechanism supporting base plate 16, and a guide rail slider 13 is arranged on the linear guide rail 12; the core pulling mechanism mounting plate 3 is connected to the guide rail slider 13, and the core pulling mechanism mounting plate 3 moves on the linear guide rail 12 through the guide rail slider 13. The core pulling mechanism supporting base plate 16 is provided with a core pulling mechanism fastening screw 14 and a core pulling mechanism positioning pin 15.

[0060] The driving assembly includes a driving cylinder 18 and a driving cylinder mounting plate 1; the driving cylinder 18 is arranged on the driving cylinder mounting plate 1, and the driving end of the driving cylinder 18 can drive the core pulling mechanism mounting plate 3 to move; a floating joint 2 is arranged on the driving shaft of the driving cylinder 18. A guide rod 19 is arranged between the driving cylinder mounting plate 1 and the core pulling mechanism mounting plate 3; one end of the guide rod 19 is connected to the driving cylinder mounting plate 1 through a linear bearing 20, and the other end of the guide rod 19 is connected to the core pulling mechanism mounting plate 3; the guide rod 19 is used for guiding during the movement of the core pulling mechanism mounting plate 3. The driving cylinder mounting plate 1 is provided with a cylinder mounting plate fastening screw 17.

[0061] The core pulling structure also includes a self-centering spring base 4, a self-centering spring 5 of the core pulling mechanism, a cylinder mounting base 6 and a core pulling mechanism extension rod 24; the cylinder mounting base 6 is connected to the core pulling cylinder 8, the self-centering spring base 4 is arranged on the core pulling mechanism mounting plate 3, and the self-centering spring 5 of the core pulling mechanism is arranged between the self-centering spring base 4 and the cylinder mounting base 6; one end of the core pulling mechanism extension rod 24 passes through the self-centering spring 5 of the core pulling mechanism and is connected to the self-centering spring base 4; the other end of the core pulling mechanism extension rod 24 passes through the cylinder mounting base 6, and is used to drive the core pulling shaft 21 to move.

[0062] The core-pulling cylinder 8 is provided with an air pipe joint 9; the core-pulling shaft 21 is provided with a piston structure 27, and a piston tightening spring 25 is provided between the core-pulling mechanism extension rod 24 and the piston structure 27; when the air pipe joint 9 is connected to the air source, the piston structure 27 drives the core-pulling shaft 21 to generate a pulling force on the inner expansion seal ring locking member 11, so that the core-pulling cylinder 8 and the inner expansion seal ring locking member 11 generate an extrusion force on the inner expansion seal ring 10. A first piston seal ring 22 is provided between the piston structure 27 and the inner side wall of the core-pulling cylinder 8; a second piston seal ring 23 is provided between the core-pulling shaft 21 and the inner side wall of the core-pulling cylinder 8; the air inlet position of the air pipe joint 9 is located between the first piston seal ring 22 and the second piston seal ring 23. In this embodiment, the air pipe joint 9 is a micro air pipe joint.

[0063] The driving cylinder 18 drives the extrusion process: Figure 1 and Figure 2 As shown, the driving shaft of the driving cylinder 18 extends in the direction B, thereby driving the entire core-pulling mechanism to move in the direction B, so that the inner expansion seal ring 10 is located in the tested hole. If the tested hole is a blind hole, the inner expansion seal ring locking member 11 will abut against the bottom of the blind hole, and the driving shaft of the driving cylinder 18 continues to extend in the direction B. When the inner expansion seal ring locking member 11 does not move, the core-pulling cylinder 8 will generate an extrusion force in the direction B on the inner expansion seal ring 10, so that the inner expansion seal ring 10 expands inward. If the tested hole is not a blind hole, the relative fixation between the inner expansion seal ring locking member 11 and the tested product can be achieved through an internal contour positioning block.

[0064] Air pipe joint 9 air intake extrusion process: Figure 2 As shown, after the air pipe joint 9 is connected to the air source, the gas medium enters the core-pulling cylinder 8, increasing the pressure in the core-pulling cylinder 8, and then pushing the piston structure 27 to move in the direction A, the piston structure 27 drives the core-pulling shaft 21 to move in the direction A, the core-pulling shaft 21 drives the inner expansion sealing ring locking piece 11 to move in the direction A, the inner expansion sealing ring locking piece 11 generates an extrusion force in the direction A on the inner expansion sealing ring 10, causing the inner expansion sealing ring 10 to expand inward.

[0065] The hole to be tested can be a blind hole or not. If it is not a blind hole, the product's internal contour positioning block can be used to fix the product and play a role in extruding the inner expansion seal ring. In the above two extrusion processes, the inner expansion seal ring locking piece is fixed on the core pulling shaft 21, and has a matching relationship with the product. It contacts the product when in action, and has no fixed relationship with the product. The workpiece to be tested is fixed under the action of the tooling. The length of the mechanism in the A and B directions of this embodiment is tailored and determined according to the position of the product. The driving cylinder 18, the guide rod 19, and the floating joint 2 push the core pulling mechanism mounting plate 3, the self-centering spring base 4, the core pulling mechanism self-centering spring 5, the cylinder mounting base 6, the core pulling cylinder locking nut 7, the core pulling cylinder 8, the inner expansion seal ring 10, the inner expansion seal ring locking piece 11, the core pulling shaft 21, the piston tensioning spring 25, and the piston structure 27 in the direction of the test product to perform leak detection and sealing. At the same time, it can realize the return of the above components to the original position along the A direction. Among them, the driving cylinder mounting plate 1 is used to The driving cylinder 18 is fixed, and the cylinder mounting plate fixing screw 17 is used to lock the driving cylinder mounting plate 1. The linear guide 12 and the guide slider 13 are used to push the core pulling mechanism mounting plate 3 to slide in the A direction or the B direction. The core pulling mechanism support base plate 16 is tailored according to the product height. The core pulling mechanism fastening screw 14 and the core pulling mechanism positioning pin 15 are used to fix the core pulling mechanism support base plate 16 to achieve support. The piston and the core pulling shaft are sealed sliding structures. The air pipe joint 9 is inlet, and the piston and the core pulling shaft are pulled backward. In the actual test, the sealing test is carried out from the side of the test product, and the B direction is perpendicular to the plane where the test hole is located.

[0066] Embodiment 2:

[0067] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0068] The present embodiment provides a micro porous internal expansion extrusion sealing mechanism, including: a driving cylinder, a floating joint, a core pulling mechanism mounting plate, a self-centering spring base, a core pulling mechanism self-centering spring, a cylinder mounting base, a core pulling cylinder locking nut, a core pulling cylinder, an air pipe joint, an internal expansion sealing ring, an internal expansion sealing ring locking nut, a linear guide rail, a guide rail slider, a core pulling mechanism fastening screw, a core pulling mechanism locating pin, a core pulling mechanism support plate, a cylinder mounting plate fastening screw, a driving cylinder, a guide rod, a linear bearing, a core pulling shaft, a first piston sealing ring, a second piston sealing ring, a core pulling mechanism extension rod, a piston tightening spring, and a floating joint locking nut.

[0069] The core pulling mechanism mounting plate is used to install the core pulling mechanism. The driving cylinder is connected to the cylinder mounting plate. Linear bearings and guide rods are provided on both sides of the plate to ensure that the cylinder and the core pulling mechanism move in a straight line. An air pipe joint is provided on the side of the core pulling mechanism. A floating joint is provided at the bottom of the core pulling mechanism. A tightening spring is provided inside the core pulling shaft. The core pulling shaft is provided with two sealing rings at both ends inside the cylinder barrel. The air pipe joint is located between the two sealing rings. The air pipe joint moves forward under the force of an external air source. When the force of an external air source is lost, the tightening spring behind the core pulling shaft returns to its original position. The utility model fixes the sealing ring locking nut. When the driving cylinder moves forward, if the front end hole of the sealing ring locking nut is a blind hole, the sealing ring can be squeezed to expand further inside the cylinder to achieve a better sealing effect.

[0070] The top of the floating joint 2 is used to install the core pulling mechanism mounting plate 3 to remove hard force. The bottom of the core pulling mechanism mounting plate 3 is provided with a self-centering spring base 4 for placing the self-centering spring 5 and the core pulling mechanism extension rod 24. A through hole is provided in the middle of the cylinder mounting plate 1 for the cylinder to extend and push the core pulling mechanism and the core pulling mechanism mounting plate in front.

[0071] The driving cylinder 18 passes through the through hole in the middle of the floating joint 2 and is connected to the middle of the core-pulling mechanism mounting plate 3 through the cylinder mounting plate 1. There are guide rods 19 and linear bearings 20 on both sides to ensure the linear movement of the cylinder. A linear guide rail 12 and a guide rail slider 13 are installed under the core-pulling mechanism mounting plate 3 to ensure smooth movement up, down, left, and right under the action of the cylinder, reducing friction and ensuring the accuracy of the mechanism. The internal expansion sealing ring 10 of the core-pulling mechanism installed in front of the core-pulling mounting plate is connected by the core-pulling shaft 21, the cylinder barrel 8, and the front nut 11. When the micro joint 9 is supplied with air source, it pulls backward. Because there are two piston sealing rings in the middle of the micro joint 9, the first piston sealing ring 23 and the second piston sealing ring 22, under the action of the force of the front internal expansion sealing ring 10, it makes an internal expansion movement, which is equivalent to a self-made non-standard single-control cylinder. In the case of no air source, the piston behind the core-pulling shaft presses the spring 25 forward to make the internal expansion sealing ring 10 return to its original shape and position. The sealing ring is installed on the core-pulling shaft 24, and there is a sealing ring locking nut 11 in front of the sealing ring. The core-pulling shaft 24 can slide along the length direction of the core-pulling mechanism. The piston pressing spring 25 plays a role in returning the internal expansion sealing ring to its original state. When the air pipe joint 9 cuts off the air, after the mechanism test, it needs to return to the original state. Because the internal expansion of the sealing ring is larger than the hole, if it does not return to the original state, it cannot be retracted. The core-pulling mechanism is provided with a cylinder barrel mounting base 6 with a core-pulling mechanism extension rod 24 inside, which is mainly used for multi-hole, small hole openings, and relatively compact spaces; there is a self-centering spring base and a core-pulling mechanism self-centering spring at the rear end, and the acting forces of the two ensure that the extended position is vertically forward and can also perform 360° slight guiding.

[0072] The head of the core-pulling mechanism is provided with an internal expansion sealing ring and a sealing ring locking nut. The top of the internal expansion sealing ring 10 is provided with an internal expansion sealing ring locking nut, and a core-pulling shaft is arranged inside the sealing ring. In the axial projection, they are distributed in a product shape on the core-pulling mechanism mounting plate. The core-pulling mechanism is distributed in a product shape, that is, it is applicable to multi-hole manufacturing. The vertical distance from the outer edge of the core-pulling cylinder barrel 8 at the bottom of the internal expansion sealing ring 10 to the axis is equivalent to that of the internal expansion sealing ring. When the core-pulling cylinder barrel is fixed, when the compressed air of the medium enters the air pipe joint 9 and is greater than the force of the piston pressing spring 25, the core-pulling shaft 21 moves backward, so that the internal expansion sealing ring 10 is compressed and deformed, and its volume becomes larger because the sealing ring locking nut 11 is fixed on the core-pulling shaft.

[0073] In front of the internal expansion sealing ring core-pulling mechanism is the test position. When performing leak detection work, the component to be leak-tested is set in the test position.

[0074] The sealing ring installation is provided with a linear guide rail 12 and a guide rail slider 13. The core-pulling mechanism mounting plate is arranged on the core-pulling mechanism support bottom plate 16 through the linear guide rail 12.

[0075] It also includes a driving cylinder 18, which is arranged on the cylinder mounting plate 1 and is connected to the cylinder mounting plate 1.

[0076] The core pulling mechanism, i.e. the sealing ring tooling, is fixedly mounted on the core pulling mechanism mounting plate 3 by means of fastening screws. The bottom of the core pulling mechanism supporting base plate 16 is provided with fastening screws 14 and positioning pins 15. The core pulling mechanism is coaxially arranged with the cylinder floating joint 2 of the driving cylinder 18.

[0077] The guide rod 19 is axially arranged on the side surface of the driving cylinder mounting plate 1 , and the driving cylinder mounting plate 1 , the core pulling mechanism mounting plate and the sealing ring locking nut 11 are arranged in parallel.

[0078] The driving cylinder mounting plate 1 is rectangular, the sealing ring mounting shaft is circular, and there are two guide rods 19 , which are respectively mounted on the end surfaces on both sides of the cylinder mounting plate 1 .

[0079] The inner expansion sealing ring 10 is provided with a threaded hole, and three inner expansion sealing rings 10 are respectively installed on the core-pulling shaft.

[0080] The bottom of the driving cylinder mounting plate 1 is provided with a cylinder mounting plate fastening screw 17 .

[0081] The floating joints 2 are arranged on both sides of the driving cylinder mounting plate 1 and are perpendicular to the guide rods 19. The length of the guide rods 19 matches the length of the component to be tested for leakage.

[0082] The outer edge of the top of the annular sealing ring is in close contact with the bottom of the sealing ring locking nut.

[0083] A spring device is provided at the bottom. Once the blind hole is sealed by the leak detection, the front sealing ring locking nut 11 is stressed, and the force of the rear piston pressing spring can squeeze the sealing ring 10, thereby achieving better sealing.

[0084] Embodiment 3:

[0085] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0086] In view of the defects in the prior art, this embodiment provides a micro porous internal expansion extrusion sealing mechanism.

[0087] The micro porous internal expansion extrusion sealing mechanism provided in this embodiment includes a cylinder body, a sealing ring tooling, a sealing ring mounting block and a cylinder mounting plate. The top of the cylinder mounting plate is used to install the cylinder body, the bottom of the cylinder mounting plate is provided with a support rod, and the middle of the cylinder mounting plate is provided with a through hole.

[0088] The cylinder floating joint of the cylinder body passes through the through hole in the middle of the cylinder mounting plate and is connected to the core pulling mounting plate of the core pulling mechanism. The inner expansion sealing ring is installed on the core pulling shaft (commonly known as the piston shaft). The bottom of the sealing ring is connected to the cylinder barrel, and the upper part is connected to the sealing ring locking nut. A guide rail is arranged under the sealing ring mounting block so that it can slide along the length direction of the cylinder. A sealing ring and an air pipe joint are arranged in the middle and inside of the sealing ring tooling (core pulling mechanism).

[0089] The core-pulling mechanism of the sealing ring tooling is a piston-type sealing ring that is sleeved on the shaft. A locking nut is provided on the top of the sealing ring. The sealing ring locking nut and the core-pulling shaft are connected by a fastening screw. In the axial projection, the inner expansion sealing ring is circular and sleeved on the core-pulling shaft. The bottom of the inner expansion sealing ring is connected to the cylinder barrel, and the upper part of the inner expansion sealing ring is connected to the locking nut. When the sealing ring is pulled backward on the axis, the sealing ring is deformed and enlarged by internal expansion to achieve a sealing effect.

[0090] The front of the sealing ring tooling (core pulling mechanism) is a test position. When performing leak detection, the component to be leak-tested is arranged in the test position.

[0091] The inner expansion sealing ring is installed on the rear of the core pulling mechanism and a linear bearing is arranged thereon. The inner expansion sealing ring is installed on a support rod arranged thereon via the linear bearing.

[0092] It also includes an air pipe joint, which is arranged on the cylinder of the core pulling mechanism and connected to the core pulling mechanism.

[0093] The inner expansion seal ring fixture (core pulling mechanism) is fixedly installed on the lower part of the inner expansion seal ring (core pulling mechanism) through guide rail fastening screws, and the inner expansion seal ring fixture is coaxially arranged with the cylinder floating joint of the driving cylinder.

[0094] The guide rods are arranged in parallel on both sides of the cylinder, and the cylinder mounting plate, the inner expansion sealing ring mounting block (core pulling mechanism) and the sealing ring tooling are arranged vertically.

[0095] The cylinder mounting plate and the inner expansion seal ring core pulling mechanism mounting block are both rectangular, and there are two guide rods, which are respectively mounted on the edges of both sides of the cylinder mounting plate;

[0096] The sealing ring fixtures, i.e., the core pulling mechanisms, can be three or more depending on the product. The core pulling mechanisms, i.e., the inner expansion sealing ring fixtures, are distributed in a herringbone shape on the core pulling mechanism mounting plate.

[0097] The bottom of the cylinder mounting plate is provided with fastening screws to facilitate the positioning of the tooling.

[0098] The guide rods are arranged in pairs on both sides of the cylinder mounting plate and are perpendicular to the cylinder mounting plate. The length of the guide rods matches the height of the component to be tested for leakage.

[0099] The internal expanding sealing ring matching with the leak detection inner hole can also implement an open-mode specified sealing ring.

[0100] The thickness of the internal expanding sealing ring is less than the depth of the inner hole of the product to be leak-detected.

[0101] The structure of this embodiment is simple and easy to operate. By means of a self-made core-pulling mechanism, the shape can be changed arbitrarily according to the product, so that the internal expansion of the sealing ring is generated to avoid scratching in the vertical distance direction of the hole. The cooperation between the internal expanding sealing ring and the internal expanding sealing ring tooling becomes tighter with use, and internal expansion and extrusion sealing are generated under the influence of external forces.

[0102] Embodiment 4:

[0103] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0104] This embodiment provides a micro-porous internal expanding extrusion sealing mechanism. By means of a core-pulling shaft and a sealing ring locking nut on the sealing ring, the backward pulling force during use will cause the sealing ring to expand internally, so that the cooperation between the sealing ring and the sealing ring tooling can arbitrarily adjust the length of the shaft, and extrusion sealing can be achieved under the influence of external forces.

[0105] According to the micro-porous internal expanding extrusion sealing mechanism provided by this embodiment, as Figures 1 to 3 shown, it includes a driving cylinder mounting plate 1, a driving cylinder 18. The driving cylinder 18 is installed on the end face of the driving cylinder mounting plate 1. Linear bearings 20 and guide rods 19 are installed on both side faces of the driving cylinder mounting plate 1. A floating joint 2 and a floating joint locking nut 26 are arranged at the tail of the cylinder. A threaded hole is provided at the tail of the guide rod 19 for connecting the core-pulling mechanism mounting plate 3; the core-pulling mechanism mounting plate 3 is provided with through holes and is connected with the core-pulling mechanism arranged in a product shape on the core-pulling mechanism mounting plate 3. The internal expanding sealing ring nut 11, internal expanding sealing ring 10, air pipe joint 9, core-pulling cylinder barrel 8, core-pulling cylinder barrel locking nut 7, cylinder barrel mounting base 6, core-pulling mechanism self-centering spring 5, self-centering spring base 4, and core-pulling shaft 21 of the internal expanding sealing ring tooling core-pulling mechanism are connected. The formed core-pulling mechanism is arranged on the core-pulling mechanism mounting plate 3 and slides in the upper and lower right linear guide rails 12 and guide rail sliders 13 in the length direction. The core-pulling mechanism is provided with an internal expanding sealing ring; the tail of the core-pulling mechanism is a test position. When performing leak detection work, the component to be leak-detected is arranged in the test position.

[0106] As Figure 2As shown, the single core-pulling mechanism includes a core-pulling shaft 21, an internal expansion seal locking nut, an internal expansion seal 10, a core-pulling cylinder barrel 8, an air pipe joint 9, a cylinder barrel mounting base 6, a self-centering spring 5 of the core-pulling mechanism, a self-centering spring mounting base 4, a core-pulling mechanism extension rod 24, a piston pressing spring 25, a first piston seal 22, and a second piston seal 23. In the axial projection, the core-pulling mechanisms are arranged in a product shape on the core-pulling mechanism mounting plate 3, and the axial internal expansion seals are distributed in a product shape. The vertical distance from the outer edge of the bottom of the internal expansion seal 10 to the axis is equal to that of the ring-shaped internal expansion seal locking nut. Specifically, when the driving cylinder applies forward pressure to the core-pulling mechanism, through the floating joint 2 connected to the cylinder, during use, the internal expansion seal 10 will generate a squeezing component force with the forward pressure, so that the internal expansion seal is squeezed twice to achieve better sealing.

[0107] Inside the core-pulling cylinder barrel 8 of the core-pulling mechanism, there is a piston pressing spring 25 which is compressed when the air pipe joint 9 is ventilated and automatically resets when the air is cut off. In this way, the single-phase automatic reset mechanism saves mechanical space, improves production efficiency, and ensures positioning accuracy. The outer diameter of the internal expansion seal is smaller than the inner hole diameter of the product to be measured, which improves the leak detection time, ensures the smoothness of the hole, avoids scratching the hole, and improves the product qualification rate. Figure 2 As can be seen, the internal expansion seal 10 is axially installed, which improves the installation efficiency and ensures the consistency of installation.

[0108] A linear bearing 20 is provided on the driving cylinder mounting plate 1, and the internal expansion seal is arranged on the guide rod 19 through the linear bearing 20. It also includes a core-pulling mechanism mounting plate 3, which is arranged on the guide rod 19 and connected to the driving cylinder mounting plate 1 and the driving cylinder 18. The internal expansion seal 10 is coaxially arranged through the internal expansion seal locking nut, the core-pulling shaft 21, the core-pulling cylinder barrel 8, the cylinder barrel mounting base 6, the piston pressing spring 25, the self-centering spring 5 of the core-pulling mechanism, the core-pulling mechanism extension rod 24, and the self-centering spring mounting base 4, and the floating of the spring makes the product to be measured受力均匀 (the force is evenly distributed), the force-bearing surface is flat. In addition, the flatness of the driving cylinder mounting plate 1 is ensured by the linear bearings 20 and the guide rod 19 on both sides around the perimeter and the cylinder mounting plate fastening screws 17.

[0109] The driving cylinder mounting plate 1 and the core pulling mechanism mounting plate 3 are both rectangular, and there are two guide rods, which are respectively mounted on both sides of the driving cylinder mounting plate 1; the linear guide rail 12 and the guide rail slider 13 are mounted at the bottom of the core pulling mechanism mounting plate 3 to ensure the flatness and verticality of the micro porous internal expansion and extrusion sealing mechanism and the telescopic length. The core pulling mechanism support plate 16 is mounted at the bottom of the linear guide rail 12 to ensure the height of the workpiece to be measured, and the height of the core pulling mechanism support plate 16 can be adjusted. The core pulling mechanism support plate 16 is parallel to the linear guide rail 20 in pairs and perpendicular to the driving cylinder 18. The height of the core pulling mechanism support plate matches the height of the leaking part to be measured.

[0110] Embodiment 5:

[0111] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0112] In this embodiment, an inner expansion sealing ring locking nut is provided in front of the inner expansion sealing ring 10 for fastening the inner expansion sealing ring 10 and the core pulling shaft 21. The parallelism of the core pulling mechanism mounting plate 3 connected to the inner expansion sealing ring behind the inner expansion sealing ring 10 is ensured by the linear guide 12 and the guide rail slider 13. The compression amount of the inner expansion sealing ring 10 depends on the air intake amount of the air pipe joint 9 (to adjust the constant pressure) and the extension length of the driving cylinder 18.

[0113] The extended position of the inner expansion seal ring 10 is guaranteed by the length of the floating joint 2 and the two-way magnetic switch, and the front and rear positions can be adjusted. The floating joint 3 is a threaded flange, which can be fine-tuned to ensure that the test product does not deform and thus meet the leak detection requirements. The air pipe joint 9 can maintain consistent pressure, so that the force on the inner expansion seal ring 10 is consistent at different times, which can extend the service life of the inner expansion seal ring 10. Two linear bearings 20 and two guide rods 19 are fixedly installed on the drive cylinder mounting plate 1, and the guide rods 19 are connected to the core pulling mechanism mounting plate 3 to ensure that they are perpendicular to each other, and can also be connected through the drive cylinder mounting plate 1 to ensure that they are perpendicular to each other.

[0114] The use process of the utility model is as follows: when in use, the floating joint 2 is pushed forward by driving the cylinder 18 to output pressure, and the linear guide 12 moves under the push of the floating joint 2, thereby driving the core pulling mechanism mounting plate 3 to move, thereby driving Figure 2 The core pulling mechanism moves as a whole to the leak detection position. If the leak detection position and the blind hole are in contact, the sealing ring locking nut on the end face of the hole will be expanded and squeezed twice under the push of the rear force, thereby achieving a better sealing effect.

[0115] The utility model adopts the method of internal expansion and arranges a locking nut at the front end of the internal expansion sealing ring, thereby solving the risk of the internal expansion sealing ring being easily separated from the tooling, greatly reducing the risk of scratching the product, ensuring the smoothness, and greatly improving the speed of replacing the sealing ring, thereby improving production efficiency, and having the characteristics of long service life and cost saving.

[0116] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0117] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. An internal expansion and extrusion sealing mechanism, characterized in that: include: A driving assembly, a core pulling mechanism and an inner expansion sealing ring (10); The core pulling mechanism comprises a core pulling cylinder (8), a core pulling shaft (21) and an inner expansion sealing ring locking member (11); the core pulling shaft (21) is arranged in the core pulling cylinder (8), and the core pulling shaft (21) can move in the core pulling cylinder (8); the inner expansion sealing ring locking member (11) is connected and fixed to the object to be measured; The inner expansion sealing ring (10) is arranged between the core pulling cylinder (8) and the inner expansion sealing ring locking member (11); the driving assembly is used to drive the core pulling shaft (21) to move in the core pulling cylinder (8), and the core pulling shaft (21) can drive the core pulling cylinder (8) to squeeze the inner expansion sealing ring (10).

2. The internal expansion and extrusion sealing mechanism according to claim 1, characterized in that: The internal expansion and extrusion sealing mechanism also includes a core pulling mechanism mounting plate (3); The core pulling mechanism is arranged on the core pulling mechanism mounting plate (3), and the core pulling shaft (21) is connected to the core pulling mechanism mounting plate (3); The driving assembly is capable of driving the core pulling mechanism mounting plate (3) to move.

3. The internal expansion and extrusion sealing mechanism according to claim 2, characterized in that: The core pulling mechanism further comprises a self-centering spring base (4), a core pulling mechanism self-centering spring (5), a cylinder mounting base (6) and a core pulling mechanism extension rod (24); The cylinder mounting base (6) is connected to the core-pulling cylinder (8), the self-centering spring base (4) is arranged on the core-pulling mechanism mounting plate (3), and the core-pulling mechanism self-centering spring (5) is arranged between the self-centering spring base (4) and the cylinder mounting base (6); One end of the core pulling mechanism extension rod (24) passes through the core pulling mechanism self-centering spring (5) and is connected to the self-centering spring base (4); the other end of the core pulling mechanism extension rod (24) passes through the cylinder mounting base (6) and is used to drive the core pulling shaft (21) to move.

4. The internal expansion and extrusion sealing mechanism according to claim 3, characterized in that: The core-pulling cylinder (8) is provided with an air pipe joint (9); The core-pulling shaft (21) is provided with a piston structure (27), and a piston tensioning spring (25) is provided between the core-pulling mechanism extension rod (24) and the piston structure (27); When the air pipe joint (9) is connected to the air source, the piston structure (27) drives the core-pulling shaft (21) to generate a pulling force on the inner expansion seal ring locking piece (11), so that the core-pulling cylinder (8) and the inner expansion seal ring locking piece (11) generate a squeezing force on the inner expansion seal ring (10).

5. The internal expansion and extrusion sealing mechanism according to claim 4, characterized in that: A first piston sealing ring (22) is provided between the piston structure (27) and the inner wall of the core-pulling cylinder (8); A second piston sealing ring (23) is provided between the core-pulling shaft (21) and the inner wall of the core-pulling cylinder (8); The air inlet position of the air pipe joint (9) is located between the first piston sealing ring (22) and the second piston sealing ring (23).

6. The internal expansion and extrusion sealing mechanism according to claim 2, characterized in that: The core pulling mechanism also includes a core pulling mechanism supporting bottom plate (16); A linear guide rail (12) is arranged on the core-pulling mechanism support bottom plate (16), and a guide rail slider (13) is arranged on the linear guide rail (12); The core-pulling mechanism mounting plate (3) is connected to the guide rail slider (13), and the core-pulling mechanism mounting plate (3) moves on the linear guide rail (12) via the guide rail slider (13).

7. The internal expansion and extrusion sealing mechanism according to claim 6, characterized in that: The core pulling mechanism supporting bottom plate (16) is provided with a core pulling mechanism fastening screw (14) and a core pulling mechanism positioning pin (15).

8. The internal expansion and extrusion sealing mechanism according to claim 2, characterized in that: The driving assembly comprises a driving cylinder (18) and a driving cylinder mounting plate (1); The driving cylinder (18) is arranged on the driving cylinder mounting plate (1), and the driving end of the driving cylinder (18) can drive the core pulling mechanism mounting plate (3) to move; A floating joint (2) is arranged on the driving shaft of the driving cylinder (18).

9. The internal expansion and extrusion sealing mechanism according to claim 8, characterized in that: A guide rod (19) is provided between the driving cylinder mounting plate (1) and the core pulling mechanism mounting plate (3); One end of the guide rod (19) is connected to the drive cylinder mounting plate (1) via a linear bearing (20), and the other end of the guide rod (19) is connected to the core pulling mechanism mounting plate (3); The guide rod (19) is used for guiding the core pulling mechanism mounting plate (3) during its movement.

10. The internal expansion and extrusion sealing mechanism according to claim 8, characterized in that: The driving cylinder mounting plate (1) is provided with a cylinder mounting plate fastening screw (17).

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