A double-acting self-limiting internal expansion sealing mechanism

Abstract

The utility model discloses a double-acting self-limiting internal expansion sealing mechanism, which belongs to the technical field of sealing leakage detection, and includes an internal expansion and clamping rod and a guide rod sleeved on its outer circumference, the internal expansion and clamping rod includes an inner rod and a clamping portion arranged at the end of the inner rod, a sealing member is arranged between the clamping portion and the guide rod, and the internal expansion and clamping rod and the guide rod move toward or away from each other to squeeze and release the sealing member, thereby realizing the sealing and unsealing of the workpiece hole, and the internal expansion and clamping rod is provided with a structural combination of an elastic member and a limiting ring to drive the movement of the internal expansion and clamping rod, so that when the sealing head part in the sealing mechanism is extended into the workpiece hole or taken out of the workpiece hole, the sealing member can be squeezed or released accordingly. The utility model has a simple overall structure, can be installed in a detection platform, and can automatically realize the compression and release of the sealing member as the sealing head moves in the workpiece hole, greatly improving the leakage detection efficiency, and is suitable for large-scale application in the field of workpiece leakage detection.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing leakage detection, and particularly relates to a double-action self-limiting internal expansion sealing mechanism. Background Art

[0002] With the rapid development of the automotive industry, the demand for testing structural components such as cylinder blocks, cylinder heads, and transmissions is also increasing. This typically involves sealing the holes in these components before leak testing. However, currently, these holes are typically sealed using direct surface contact seals or cylinder compression internal expansion seals. This can result in scratches on the inner wall of the workpiece hole being tested, or the surface cannot be directly sealed, negatively impacting the sealing test results. This also results in a significant waste of manpower and resources during leak testing, impacting company profitability.

[0003] In order to solve this problem, an elastic sealing method is adopted to seal the hole to protect the inner wall of the workpiece hole. However, in the existing technology, after the sealing mechanism is extended into the hole, the elastic member is pressed and tightened to achieve sealing. After the leak detection operation is completed, the elastic member needs to be restored to contraction and then removed. Such operation efficiency is not high enough.

[0004] Therefore, there is an urgent need for a sealing mechanism that can control the expansion and contraction of the sealing member while the sealing mechanism moves. Utility Model Content

[0005] In response to one or more of the above-mentioned defects or improvement needs in the prior art, the utility model provides a double-acting self-limiting internal expansion sealing mechanism, in which the expansion and contraction of the seal are synchronously controlled while the sealing mechanism performs reciprocating motion in the workpiece hole, so as to improve the leakage detection efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides a double-acting self-limiting internal expansion sealing mechanism, comprising an inner rod and a guide rod sleeved on the outer periphery of the inner rod, wherein the outer peripheral wall surface of the inner rod is in contact with the inner peripheral wall surface of the guide rod, so that the inner rod can reciprocate along the axial direction.

[0007] A pressing portion is provided at one end of the inner rod, the outer diameter of the pressing portion is larger than the outer diameter of the inner rod, and a sealing member is provided between the pressing portion and the guide rod;

[0008] A guide hole is provided on the side wall surface of the guide rod, and a convex portion is provided on the outer peripheral wall surface of the inner rod. The convex portion is accommodated in the guide hole and can reciprocate within the range of the guide hole to drive the inner rod to reciprocate in the axial direction.

[0009] As a further improvement of the present invention, an elastic member is sleeved on the outer periphery of the guide rod, a limiting ring is provided at one end of the elastic member away from the sealing member, and the limiting ring is fixedly connected to the convex portion.

[0010] As a further improvement of the present invention, the protrusion is a pin, a first pin hole is provided on the side wall of the inner rod, a second pin hole is provided on the limiting ring that passes through the inner and outer walls thereof, and the pin passes through the second pin hole and the first pin hole, so that the limiting ring is fixedly connected to the inner rod.

[0011] As a further improvement of the present invention, the guide hole is a waist-shaped hole extending in the axial direction;

[0012] and / or

[0013] The guide holes are two respectively arranged on both sides of the guide rod.

[0014] As a further improvement of the present invention, a driving portion is provided at one end of the guide rod away from the sealing member, the driving portion includes a seat body and a driving rod capable of axial reciprocating motion, and the driving rod is fixedly connected to the guide rod.

[0015] As a further improvement of the present invention, a fixing plate is provided at one end of the elastic member away from the driving portion. The fixing plate is sleeved on the outer periphery of the guide rod and fixedly connected to the base body of the driving portion.

[0016] As a further improvement of the present invention, the fixing plate and the base body are connected via connecting rods, and the connecting rods are two respectively arranged on both sides of the guide rod.

[0017] As a further improvement of the present invention, a guide sleeve is provided on the outer periphery of the guide rod, and the guide sleeve is fixedly connected to the fixing plate.

[0018] As a further improvement of the present invention, the sealing member is a sealing ring;

[0019] and / or

[0020] The sealing element is made of nitrile rubber.

[0021] As a further improvement of the present invention, an end of the pressing portion away from the guide rod is provided with an end head, and the end head is made of protective nylon.

[0022] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0023] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0024] (1) The double-action self-limiting internal expansion sealing mechanism of the present invention is provided with a guide hole on the guide rod and a convex portion on the outer peripheral wall of the inner rod, and the convex portion is located in the guide hole, so that the inner expansion and tightening rod and the guide rod sleeved on the inner expansion and tightening rod move toward or away from each other, thereby squeezing or loosening the seal;

[0025] (2) The double-action self-limiting internal expansion sealing mechanism of the present invention is provided with a limiting ring on the convex part and matched with an elastic member, so that during the advancement of the sealing head (i.e., the portion of the internal expansion and compression rod and the guide rod extending into the workpiece hole and the sealing member), the elastic member is compressed and provides elastic force to the limiting ring, thereby pushing the internal expansion and compression rod to the other side, thereby realizing the relative movement between the internal expansion and compression rod and the guide rod. When removing the sealing member, the elastic member no longer applies elastic force, and correspondingly, the sealing member is no longer squeezed, thereby making it easier to remove the sealing mechanism from the workpiece hole. The entire process moves with the extension or removal of the sealing head, greatly improving the leakage detection efficiency.

[0026] (3) The double-action self-limiting internal expansion sealing mechanism of the present invention fixes the inner rod and the limiting ring together by a latch, so that the limiting ring and the internal expansion and compression rod form a whole, and the elastic member drives the internal expansion and compression rod to move by pushing the limiting ring;

[0027] (4) The double-acting self-limiting internal expansion sealing mechanism of the present invention is provided with a waist-shaped hole through a guide hole, and the waist-shaped hole is provided to extend in the axial direction to determine the movement direction of the convex part, thereby causing it to move in the axial direction;

[0028] A guide sleeve is also provided on the outer periphery of the guide rod to limit the movement of the guide rod and ensure that it also moves axially;

[0029] (5) The double-acting self-limiting internal expansion sealing mechanism of the present invention can be installed on the detection platform by setting a mounting seat. A driving part can be installed on one side to drive the guide rod to move, and a mounting plate and a fixed plate are provided on the other side. The two plate structures are arranged at intervals along the axial direction and are connected by a connecting rod. A guide sleeve is also provided on the fixed plate, thereby realizing automatic control of the sealing mechanism and realizing automatic sealing or unsealing under the action of the elastic member. The overall structure is simple and suitable for large-scale application in the field of workpiece leakage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall structure of the double-action self-limiting internal expansion sealing mechanism in the embodiment of the utility model;

[0031] Figure 2 This is a side view of the double-action self-limiting internal expansion sealing mechanism in the embodiment of the utility model;

[0032] Figure 3 This is a cross-sectional view of a double-acting self-limiting internal expansion sealing mechanism in an embodiment of the present utility model;

[0033] Figure 4 It is a side view of the guide rod in the embodiment of the present utility model;

[0034] Figure 5 is a cross-sectional view of a guide rod in an embodiment of the present utility model;

[0035] In all the drawings, the same figure marks represent the same technical features, specifically: 1. guide rod; 2. internal tensioning rod; 3. seal; 4. elastic member; 5. limit ring; 6. latch; 7. end; 8. cylinder; 81. cylinder body; 82. piston rod; 9. fixing plate; 10. mounting plate; 11. mounting seat; 12. connecting rod. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0041] Example:

[0042] The double-action self-limiting internal expansion sealing mechanism in the preferred embodiment of the present utility model is as follows Figures 1 to 5 As shown in , it includes an inner tensioning and tightening rod and a guide rod sleeved on the outer periphery of the inner tensioning and tightening rod. The inner tensioning and tightening rod reciprocates along the axial direction under the limiting action of the guide rod, thereby tightening and loosening the seal to adjust the expansion and contraction of the seal in the workpiece hole.

[0043] Specifically, the inner tensioning and pressing rod 2 includes an inner rod and a pressing portion provided at the end of the inner rod. The inner circumferential wall of the guide rod 1 fits in contact with the outer circumferential wall of the inner rod, thereby guiding the movement of the inner rod. Furthermore, the outer diameter of the pressing portion is larger than the outer diameter of the inner rod, so that the seal 3 is provided on the outer circumferential wall of the inner rod and is located between the pressing portion and the guide rod 1. The inner rod moves axially, driving the pressing portion and the guide rod 1 to move toward or away from each other, thereby squeezing or loosening the seal 3, causing the outer diameter of the seal 3 to expand or contract, thereby achieving sealing or opening of the workpiece hole. To further illustrate, the length direction of the guide rod 1 is the axial direction of the present invention.

[0044] Furthermore, if Figure 4 、 5As shown, a guide hole is formed on the side wall of the guide rod 1, extending through its inner and outer walls. A protrusion is provided on the side wall of the inner rod. The protrusion is received in the guide hole, allowing the protrusion to reciprocate within the guide area of ​​the guide hole, thereby driving the inner tensioning and tightening rod 2 to reciprocate in the axial direction. Further preferably, the guide hole is a waist-shaped hole, extending in the axial direction.

[0045] In one embodiment, a drive portion is provided at one end of the guide rod 1 away from the seal 3, and a corresponding drive device is provided on the convex portion. Driven by the drive portion, the guide rod 1 moves into the workpiece hole, and the convex portion is also driven by the drive device to move in the opposite direction of the movement direction of the guide rod 1, thereby causing the inner tensioning rod 2 and the guide rod 1 to move toward each other, thereby squeezing and expanding the seal 3 and sealing the workpiece hole. When the guide rod 1 is removed from the workpiece hole, the drive device drives the convex portion to move in the other direction, causing the inner tensioning rod 2 and the guide rod 1 to move away from each other, thereby loosening and contracting the seal 3 and easily removing the sealing mechanism. Furthermore, the drive portion and the drive device are electrically connected, so that the drive portion and the drive device form a linkage, that is, the two move toward or away from each other simultaneously or within a set time / mileage, thereby causing the guide rod 1 and the inner tensioning rod 2 to move toward or away from each other, thereby achieving an automatic sealing or unsealing function.

[0046] like Figures 1 to 3 As shown in , in one embodiment, an elastic member 4 is further sleeved on the outer periphery of the guide rod 1, and a limiting ring 5 is further provided at the end of the elastic member 4 away from the sealing member 3, and the inner wall surface of the limiting ring 5 is fixedly connected to the protrusion. In actual application, as the entire sealing mechanism moves into the workpiece hole, the elastic member 4 located outside the guide rod 1 abuts against the outer wall of the workpiece, and the elastic member 4 provides elastic force to the limiting ring 5, so that the limiting ring 5 drives the protrusion to move in the opposite direction, and then the inner tensioning rod 2 and the guide rod 1 clamp the sealing member 3 to achieve sealing. When the workpiece hole is unsealed, the entire sealing mechanism moves outward, the elastic member 4 no longer provides elastic force, and the guide rod 1 and the inner tensioning rod 2 move apart in the axial direction, thereby achieving the loosening of the sealing member 3. Further preferably, the elastic member 4 is preferably a spring, and the spring compression amount is ≥12mm.

[0047] Furthermore, to achieve a fixed connection between the retaining ring 5 and the inner rod, its protrusion is preferably a latch 6, and correspondingly, a first pin hole is provided on the side wall of the inner rod, and a second pin hole is provided on the retaining ring 5 that penetrates its inner and outer walls. The first pin hole and the second pin hole are aligned, and the latch 6 passes through the second pin hole and is inserted into the first pin hole, thereby achieving a fixed connection between the retaining ring 5 and the inner rod, and the latch 6 can reciprocate in the guide hole. Further preferably, the retaining ring 5 and the inner rod can also be connected by a bolt, and its protrusion is also correspondingly configured as a screw, which moves in the guide hole.

[0048] Furthermore, if there are two guide holes on both sides of the guide rod 1, then the first pin holes can be two on both sides of the inner rod, and the second pin holes are also two on both sides of the limiting ring 5, then there are also two corresponding pins 6 to achieve a stable connection between the inner rod and the limiting ring 5.

[0049] In another preferred embodiment, the first pin hole is a through hole extending through the inner rod's two side walls, and the two second pin holes are aligned with the first pin hole. The latch 6 then passes through the second pin hole, the first pin hole, and the other second pin hole in sequence, thereby securing the retaining ring 5 to the inner rod. Furthermore, the inner rod and latch 6 have an H7 / g6 fit.

[0050] Furthermore, a drive unit is provided at the end of the guide rod 1 away from the seal 3. The drive unit includes a base and a drive rod capable of axial reciprocating motion. The drive rod is fixedly connected to the guide rod 1, with the drive unit serving as the power unit of the sealing mechanism. Further preferably, the drive unit is a cylinder 8, the base is a cylinder body 81, and the drive rod is a piston rod 82. The outer peripheral wall surface of the piston rod 82 at the end away from the cylinder body 81 is provided with an external thread structure. The guide rod 1 is a hollow structure, and its inner peripheral wall surface at the end away from the seal 3 is provided with an internal thread structure to form a threaded connection with the piston rod 82, thereby forming a stable connection between the two.

[0051] Furthermore, a fixing plate 9 is provided at the end of the elastic member 4 away from the driving unit. The fixing plate 9 is sleeved around the outer periphery of the guide rod 1 and is fixedly connected to the base of the driving unit. When the driving unit drives the guide rod 1 to move, the elastic member 4 does not need to contact the outer wall of the workpiece to apply elastic force to the limit ring 5. Instead, it contacts the fixing plate 9 to provide elastic force to the limit ring 5. Further preferably, the fixing plate 9 and the base are connected by connecting rods 12, and two connecting rods 12 are provided on both sides of the guide rod 1.

[0052] It is further explained that the base body of the driving part maintains a certain relative position with the workpiece, so that the fixing plate 9 also maintains a certain relative position during the entire sealing process, so that when the driving part drives the guide rod 1 to move, the inner tensioning rod 2, the sealing member 3 and the guide rod 1 move as a whole into the hole, but the limiting ring 5 gradually presses the elastic member 4 during the movement, so that the elastic member 4 provides elastic force to the limiting ring 5 to drive the inner tensioning rod 2 to move in the opposite direction (i.e. outside the hole), thereby clamping the sealing member 3, and during the removal process, the elastic member 4 returns to the non-working state and no longer applies elastic force to the limiting ring 5, and during the movement of the guide rod 1, the hole wall of its guide hole close to the sealing member 3 side abuts against the convex portion to bring out the inner tensioning rod 2, and at this time the sealing member 3 is in a contracted state.

[0053] Furthermore, the sealing mechanism includes a mounting base 11, which is fixed to the detection platform via the mounting base 11 for leak detection. Further preferably, the mounting base 11 is an L-shaped plate structure, with a through-hole formed in the vertical plate portion to allow the drive rod in the drive unit to pass through. The seat in the drive unit is fixedly connected to the vertical plate, and a mounting plate 10 is mounted on the other side of the vertical plate. The mounting plate 10 is fixedly connected to the vertical plate on one side and to the fixed plate 9 on the other side via a connecting rod 12.

[0054] Furthermore, a guide sleeve is provided on the outer periphery of the guide rod 1 to limit the movement of the guide rod 1 and ensure its axial movement.

[0055] Furthermore, the seal 3 is a sealing ring, which is sleeved on the inner rod and abuts against the end face of the pressing portion, and is made of nitrile rubber. Further preferably, the pressing portion is provided with a terminal 7 at one end away from the guide rod 1, and the terminal 7 is made of protective nylon.

[0056] The double-action self-limiting internal expansion sealing mechanism of the present invention includes an internal expansion and compression rod and a guide rod sleeved on its outer circumference. The internal expansion and compression rod includes an inner rod and a compression portion provided at the end of the inner rod. A sealing member is provided between the compression portion and the guide rod. A guide hole is provided on the side wall of the guide rod, and a protrusion is provided on the side wall of the inner rod. The protrusion is located in the guide hole and moves within the guide interval of the guide hole through the protrusion, thereby realizing the movement toward or away from each other between the internal expansion and compression rod and the guide rod to squeeze and release the sealing member, thereby sealing and unsealing the workpiece hole. Furthermore, a structural combination of an elastic member and a limiting ring is configured, so that when the sealing head portion in the sealing mechanism is inserted into or removed from the workpiece hole, the sealing member can be squeezed or released accordingly, thereby greatly improving the leak detection efficiency while avoiding damage to the workpiece hole.

[0057] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A double-acting self-limiting internal expansion sealing mechanism, characterized in that: The invention comprises an inner rod and a guide rod sleeved on the outer circumference of the inner rod, wherein the outer circumferential wall surface of the inner rod is in contact with the inner circumferential wall surface of the guide rod, so that the inner rod can reciprocate along the axial direction. A pressing portion is provided at one end of the inner rod, the outer diameter of the pressing portion is larger than the outer diameter of the inner rod, and a sealing member is provided between the pressing portion and the guide rod; A guide hole is provided on the side wall surface of the guide rod, and a convex portion is provided on the outer peripheral wall surface of the inner rod. The convex portion is accommodated in the guide hole and can reciprocate within the range of the guide hole to drive the inner rod to reciprocate in the axial direction.

2. The double-acting self-limiting internal expansion sealing mechanism according to claim 1, wherein: An elastic member is sleeved on the outer periphery of the guide rod, a limiting ring is arranged at one end of the elastic member away from the sealing member, and the limiting ring is fixedly connected to the convex portion.

3. The double-acting self-limiting internal expansion sealing mechanism according to claim 2, wherein: The protrusion is a latch pin, a first pin hole is formed on the side wall of the inner rod, a second pin hole is formed on the limiting ring and passes through the inner and outer walls thereof, and the latch pin passes through the second pin hole and the first pin hole, so that the limiting ring is fixedly connected to the inner rod.

4. The double-acting self-limiting internal expansion sealing mechanism according to any one of claims 1 to 3, wherein: The guide hole is a waist-shaped hole extending in the axial direction; and / or The guide holes are two respectively arranged on both sides of the guide rod.

5. The double-acting self-limiting internal expansion sealing mechanism according to claim 2 or 3, wherein: A driving part is arranged at one end of the guide rod away from the sealing member. The driving part comprises a seat body and a driving rod capable of axial reciprocating movement. The driving rod is fixedly connected to the guide rod.

6. The double-acting self-limiting internal expansion sealing mechanism according to claim 5, wherein: A fixing plate is disposed at one end of the elastic member away from the driving part. The fixing plate is sleeved on the outer periphery of the guide rod and fixedly connected to the seat body of the driving part.

7. The double-acting self-limiting internal expansion sealing mechanism according to claim 6, wherein: The fixing plate is connected to the seat body via a connecting rod, and the connecting rod is two and is arranged on both sides of the guide rod.

8. The double-acting self-limiting internal expansion sealing mechanism according to claim 6 or 7, wherein: A guide sleeve is sleeved on the outer periphery of the guide rod, and the guide sleeve is fixedly connected to the fixing plate.

9. The double-acting self-limiting internal expansion sealing mechanism according to any one of claims 1 to 3, wherein: The sealing member is a sealing ring; and / or The sealing element is made of nitrile rubber.

10. The double-acting self-limiting internal expansion sealing mechanism according to any one of claims 1 to 3, wherein: An end of the pressing portion away from the guide rod is provided with a terminal head, and the terminal head is made of protective nylon.

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