阅读说明：本技术 用于密封性检测的轴向封堵装置 (Axial plugging device for sealing detection ) 是由 张永峰 蔡明元 于 2020-06-16 设计创作，主要内容包括：本申请涉及密封性检测领域,公开了一种用于密封性检测的轴向封堵装置,该轴向封堵装置沿轴向方向延伸并包括：第一封堵体,该第一封堵体包括用于操纵轴向封堵装置的操纵端和用于封堵孔结构的第一端面的第一封堵端；第二封堵体,该第二封堵体可轴向移动且同轴地安装于所述第一封堵体,所述第二封堵体的径向尺寸小于所述第一封堵体的径向尺寸,所述第二封堵体的端部形成为用于封堵所述孔结构的第二端面的第二封堵端。根据本申请的技术方案,通过第一封堵体的第一封堵端与第二封堵体的第二封堵端分别对孔结构的第一端面和第二端面进行封堵,从而提高了封堵时的密封效果,以提高密封性检测的准确率。(The application relates to the field of leakproofness detection, discloses an axial plugging device for leakproofness detection, and this axial plugging device extends and includes along axial direction: a first plugging body comprising an actuating end for actuating the axial plugging device and a first plugging end for plugging a first end face of the bore structure; a second occluding body axially movable and coaxially mounted to the first occluding body, the second occluding body having a radial dimension less than that of the first occluding body, the end of the second occluding body being formed as a second occluding end for occluding the second end face of the cell structure. According to the technical scheme of this application, the first terminal surface and the second terminal surface of pore structure are shutoff respectively through the first shutoff end of the first shutoff body and the second shutoff end of the second shutoff body to sealed effect when having improved the shutoff, with the rate of accuracy that improves the leakproofness and detect.)

1. Axial plugging device for leak tightness testing, characterized in that it extends in an axial direction and comprises:

a first occluding body (10), the first occluding body (10) comprising a handling end (11) for handling the axial occluding device and a first occluding end (12) for occluding a first end surface (M1) of the pore structure;

a second occluding body (13), the second occluding body (13) being axially movable and coaxially mounted to the first occluding body (10), the second occluding body (13) having a radial dimension smaller than that of the first occluding body (10), the end of the second occluding body (13) being formed as a second occluding end (121) for occluding the second end face (M2) of the cell structure;

a mounting center hole (14), the mounting center hole (14) being formed at the first plugging end (12) of the first plugging body (10);

wherein the first end face (M1) is the surface of a workpiece to be plugged where the hole structure is located, the second end face (M2) is the end face facing the inside of the hole structure outside the hole, the first end face (M1) and the second end face (M2) are plugged along the axial direction of the hole structure or close to the axial direction by utilizing the first plugging end (12) and the second plugging end (121),

the first occluding body (10) is provided with a plurality of guide holes (17) at a first occluding end (12), the guide holes (17) are circumferentially distributed around the installation center hole (14), the second occluding body (13) extends toward the first occluding body (10) with a plurality of guide shafts (18), each guide shaft (18) slidably extends into the corresponding guide hole (17), and a radial gap exists between the guide shafts (18) and the guide holes (17).

2. The axial plugging device for leak tightness test according to claim 1, wherein said first plugging body (10) and said second plugging body (13) are connected to each other by a floating mechanism so that at least one of an axial relative position, a radial relative position and a central axis relative included angle of said first plugging body (10) and said second plugging body (13) is adjustable.

3. The axial plugging device for leak tightness detection according to claim 1, wherein said axial plugging device comprises a mounting center shaft (15), said mounting center shaft (15) being formed in said second plugging body (13) and protruding into said mounting center hole (14), a radial gap (S1) being provided in a radial direction between said mounting center shaft (15) and said mounting center hole (14) and an elastic member (16) being provided in an axial direction.

4. The axial plugging device for tightness detection according to claim 3, wherein said mounting central hole (14) is a stepped hole, said mounting central shaft (15) has a stepped shaft, and a spring as said elastic member (16) is disposed between said stepped hole and a stepped structure of said stepped shaft and fitted over said mounting central shaft (15).

5. The axial plugging device for tightness detection according to claim 3, wherein said guide shaft (18) is provided with a step stop structure for limiting the maximum distance said guide shaft (18) protrudes into said guide hole (17).

6. The axial plugging device for leak tightness test according to claim 3, wherein an axial gap (S2) is provided between said first plugging body (10) and said second plugging body (13) in the axial direction, the axial gap (S2) and said radial gap (S1) communicating with each other.

7. The axial plugging device for leak tightness test according to claim 6, wherein in the condition that said first plugging end (12) is pressed against a first end face (M1) of said cell structure and said second plugging end (121) is pressed against a second end face (M2) of said cell structure, the cellular space (S3) of said cell structure between the first end face (M1) and the second end face (M2) constitutes a closed space together with said axial gap (S2) and said radial gap (S1).

8. Axial plugging device for leak tightness test according to claim 1, characterized in that the end face of the first plugging end (12) is protrusively provided with at least one first elastic sealing ring (19).

9. Axial plugging device for leak tightness test according to claim 1, characterized in that the end face of the second plugging end (121) is protrudingly provided with at least one second elastic sealing ring (20).

Technical Field

The application relates to the field of tightness detection, in particular to an axial plugging device for workpiece sealing element detection.

Background

For many shell parts, the sealing performance is a key index for judging whether the parts are qualified or not, and once a leakage point exists on the shell, the parts can be directly judged to be unqualified.

For example, for the block of an engine, reliable sealing is also required at certain spatial structural points. Therefore, in order to determine whether the cylinder block is acceptable or not in the manufacturing process of the cylinder block, the sealing performance of the cylinder block needs to be detected. Generally, a plugging device is used for plugging a space structure to be detected into a closed or partially closed space, and the sealing performance of the space structure is evaluated by a pressure difference method, a direct pressure method, a flow method, a medium method and the like.

Traditionally, when a shell part of a hole structure needing to be plugged on the hole wall of a workpiece is plugged, radial plugging is mostly performed. Specifically, the plugging device is used for expanding the hole walls of the plurality of holes in the radial direction, so that the hole structures are sealed, the space structures among the hole structures are sealed, and the closed space of the area is realized.

However, in operation practice, it is often found that such a conventional plugging method may not be able to uniformly force the sealing member, so that the sealing effect is not very ideal, and the detection accuracy of the tightness detection is reduced.

Therefore, how to improve the sealing effect during plugging so as to improve the accuracy of the sealing detection becomes a technical problem to be solved in the field.

Disclosure of Invention

In view of this, the present application provides an axial plugging device for detecting a workpiece sealing element, so as to improve a sealing effect during plugging, and further improve accuracy of sealing performance detection.

According to the present application, an axial plugging device for leak testing is proposed, which extends in an axial direction and comprises: a first plugging body comprising an actuating end for actuating the axial plugging device and a first plugging end for plugging a first end face of the bore structure; a second occluding body axially movable and coaxially mounted to the first occluding body, the second occluding body having a radial dimension less than that of the first occluding body, the end of the second occluding body being formed as a second occluding end for occluding the second end face of the cell structure.

Preferably, the first blocking body and the second blocking body are connected with each other through a floating mechanism, so that at least one of the axial relative position, the radial relative position and the central axis relative included angle of the first blocking body and the second blocking body can be adjusted.

Preferably, the axial occlusion device comprises: a mounting central bore formed at the first plugging end of the first plugging body; and the mounting central shaft is formed on the second plugging body and extends into the mounting central hole, a radial gap is arranged between the mounting central shaft and the mounting central hole in the radial direction, and an elastic part is arranged in the axial direction.

Preferably, the mounting center hole is a stepped hole, the mounting center shaft is provided with a stepped shaft, and a spring sleeved on the mounting center shaft and serving as the elastic part is arranged between the stepped hole and a stepped structure of the stepped shaft.

Preferably, the first occluding body is provided with a plurality of guide holes at the first occluding end, the guide holes being circumferentially distributed around the installation central hole, the second occluding body extends towards the first occluding body with a plurality of guide shafts, each guide shaft slidably extending into a corresponding guide hole, respectively, a radial gap being present between the guide shaft and the guide hole; the guide shaft is provided with a step stopping structure for limiting the maximum distance of the guide shaft extending into the guide hole.

Preferably, the first occluding body is provided at a first occluding end with a plurality of guide holes circumferentially distributed around the mounting central hole, the second occluding body is slidably provided towards the first occluding body with a plurality of guide shafts, each guide shaft being fixedly connected in a corresponding guide hole, respectively; the guiding hole is a threaded hole, the guiding shaft is a bolt, and a limiting flange is arranged at the tail end of the bolt.

Preferably, an axial gap is provided between the first block body and the second block body in the axial direction, and the axial gap and the radial gap communicate with each other.

Preferably, in the case where the first plugging end is pressed against the first end face of the pore structure and the second plugging end is pressed against the second end face of the pore structure, the pore space of the pore structure between the first end face and the second end face constitutes a closed space together with the axial gap and the radial gap.

Preferably, the end face of the first plugging end is protrudingly provided with at least one first elastic sealing ring.

Preferably, the end face of the second plugging end is protrudingly provided with at least one second elastic sealing ring.

According to the technical scheme of this application, the first terminal surface and the second terminal surface of pore structure are shutoff respectively to the first shutoff end through the first shutoff end of the first shutoff body and the second shutoff end of the second shutoff body to compare in carrying out the traditional plugging device of shutoff to the inner peripheral surface of pore structure, the whole atress of the axial plugging device of this application is even when sealed, has improved the sealed effect when shutoff, and then has improved the rate of accuracy that the leakproofness detected.

Additional features and advantages of the present application will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate an embodiment of the invention and, together with the description, serve to explain the invention. In the drawings:

FIG. 1 is a schematic perspective view of an axial occlusion device, according to a preferred embodiment of the present application;

FIG. 2 is a cross-sectional view of the axial occlusion device of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the axial occlusion device of FIG. 1 in an occluded state;

fig. 4 is an exploded view of the axial occlusion device of fig. 1.

Detailed Description

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 and 3, the present application provides an axial occlusion device extending in an axial direction and comprising: a first occluding body 10, the first occluding body 10 comprising a handling end 11 for handling the axial occluding device and a first occluding end 12 for occluding the first end surface M1 of the pore structure; a second occluding body 13, the second occluding body 13 being axially movable and coaxially mounted to the first occluding body 10, the radial dimension of the second occluding body 13 being smaller than the radial dimension of the first occluding body 10, the end of the second occluding body 13 being formed as a second occluding end 121 for occluding the second end face M2 of the hole structure.

Conventionally, a plugging device for a pore structure is generally used for inserting a plug into the pore structure, and plugging the inner circumferential surface of the pore structure by using radial expansion of the plugging device, so as to seal the pore structure, and further seal a space structure between the pore structures. However, the inventor of the present application has found that the conventional plugging method may not have a good sealing effect due to the non-uniform stress of the plugging device in the expanded state, and thus the accuracy of the sealing detection is affected. Moreover, burrs may exist during the processing of the inner peripheral surface of the hole structure (such as the hole structure on the surface of the starting cylinder), so that the radial plugging effect is not ideal, and even the plugging device is worn, and the service life of the plugging device is influenced.

According to the technical scheme of this application, a plugging device that carries out axial shutoff to pore structure is provided. The axial plugging device plugs the first end surface M1 and the second end surface M2 of the hole structure shown in FIG. 3 along the axial direction of the hole structure or close to the axial direction through the first plugging end 12 of the first plugging body 10 and the second plugging end 121 at the end of the second plugging body 13, is particularly suitable for the hole structure of a box part (such as an engine cylinder), and avoids the defects in the traditional radial plugging. The first end face M1 is the surface of the workpiece to be plugged where the hole structure is located, and the second end face M2 is the end face facing the inside of the hole structure outside the hole. Preferably, the second plugging body 13 is axially movable and coaxially mounted on the first plugging body 10, so that the overall stress of the axial plugging device in a plugging state is more uniform, and the sealing effect during plugging is improved.

As shown in fig. 1, one end of the first blocking body 10 is a first blocking end 12 for pressing against the surface of the workpiece on which the hole structure is located to block a first end surface M1 of the hole structure, and the other end is a manipulating end 11. The diameter of the first plugging end 12 is not smaller than the aperture of the hole structure at the opening of the workpiece surface, and preferably, the diameter of the first plugging end 12 is larger than the aperture of the hole structure at the opening of the workpiece surface. The handling end 11 may be provided with a mounting hole or a clamping groove for being fixedly connected with a driving end of a driver such as a mechanical arm or an air cylinder, so that the axial plugging device completes plugging of the hole structure under the driving of the driver. The second occluding body 13 is coaxially mounted to the first occluding body 10 and is axially movable with the first occluding body 10 so as to actively or automatically adjust the axial relative position between the first and second occluding bodies 10 and 13 of the axial occluding device according to the distance of the first and second end surfaces M1 and M2 in the cell structure as shown in fig. 3. Preferably, the first blocking body 10 and the second blocking body 13 of the axial blocking device may be connected to each other through a floating mechanism, so that at least one of the axial relative position, the radial relative position and the central axis relative angle of the first blocking body 10 and the second blocking body 13 may be adjusted, thereby improving the flexibility of the axial blocking device in application to different hole structures through the floating mechanism that can adjust at least one of the axial relative position, the radial relative position and the central axis relative angle of the first blocking body 10 and the second blocking body 13. The floating mechanism can be an elastic axial floating mechanism such as a spring, rubber, a metal biasing member and the like, or the floating mechanism can realize non-axial floating for a structure such as a slide rail or a curved surface and the like, or the floating mechanism is a combination of the two schemes.

As shown in fig. 2 and 4, the axial occlusion device may include: a mounting center hole 14, the mounting center hole 14 being formed at the first plugging end 12 of the first plugging body 10; a mounting center shaft 15, the mounting center shaft 15 being formed in the second blocking body 13 and protruding into the mounting center hole 14, a radial gap S1 being provided between the mounting center shaft 15 and the mounting center hole 14 in the radial direction and an elastic member 16 being provided in the axial direction. The elastic member 16 provides an elastic force for axially floating between the mounting center shaft 15 and the mounting center hole 14, and also elastically floats the mounting center shaft 15 radially within the range of the radial gap S1. In the non-operating state, the elastic member 16 provides an elastic force for returning the mounting center shaft 15, and when plugging is performed, the elastic member 16 provides a force for pressing the second plugging end 121 toward the second end face M2. The resilient member 16 may be a spring, rubber, metal bias, or the like. The elastic member 16 may be fixedly connected to an end of the mounting center shaft 15 facing the mounting center hole 14, or as shown in fig. 2, the mounting center hole 14 is a stepped hole, the mounting center shaft 15 has a stepped shaft, and a spring as the elastic member 16 fitted around the mounting center shaft 15 is provided between the stepped hole and the stepped structure of the stepped shaft. The mounting center shaft 15 and the mounting center hole 14 are elastically floated by a spring provided between the stepped hole and the stepped structure of the stepped shaft.

In order to enable the first blocking body 10 and the second blocking body 13 to accurately block the holes located at the first end surface M1 and the second end surface M2 of the hole structure during the blocking process, an axial guide mechanism may be preferably disposed between the first blocking body 10 and the second blocking body 13.

According to a preferred embodiment, the first occluding body 10 of the axial occluding device is provided with a plurality of guide holes 17 at the first occluding end 12, the guide holes 17 being circumferentially distributed around the mounting central hole 14, the second occluding body 13 extending towards the first occluding body 10 with a plurality of guide shafts 18, each guide shaft 18 slidably protruding into a corresponding guide hole 17, a radial gap being present between the guide shafts 18 and the guide holes 17. Wherein the plurality of guide shafts 18 may be integrated with the second occluding body 13, or the plurality of guide shafts 18 are fixedly mounted to the first occluding body 10. By each guide shaft 18 slidably extending into the corresponding guide hole 17, the extending direction of the guide hole 17 and the guide shaft 18 is parallel to the axial direction of the axial occluding device, so that when the second occluding body 13 is displaced relative to the first occluding body 10, the slidable engagement of the guide hole 17 and the guide shaft 18 serves as a guide, so that the second occluding body 13 is restrained to be floatable in the axial direction. In order to limit the floating range of the second occluding body 13 with respect to the axial direction of the first occluding body 10, the guide shaft 18 may be preferably provided with a step stopper structure for limiting the maximum distance that the guide shaft 18 protrudes into the guide hole 17. Further, the length of the guide shaft 18 extending out of the second occluding body 13 may be adjustable, so that the second occluding body 13 can be adjusted to limit the size of the floatable range toward the first occluding body 10 in the axial direction. The length of the guide shaft 18 extending out of the second blocking body 13 is adjusted according to the hole structures of the first end surface M1 and the second end surface M2, which have different distances, so that the floatable range of the axial blocking device is adjusted to the range most suitable for the hole structures.

According to another preferred embodiment of the axial occluding device, as shown in fig. 2, the first occluding body 10 is provided with a plurality of guide holes 17 at the first occluding end 12, the guide holes 17 being circumferentially distributed around the installation central hole 14, and the second occluding body 13 is slidably provided with a plurality of guide shafts 18 toward the first occluding body 10, each guide shaft 18 being fixedly connected in a corresponding guide hole 17, respectively. The second occluding body 13 is provided with a plurality of holes to be slidably engaged with the plurality of guide shafts 18 so that the guide shafts 18 fixedly coupled to the guide holes 17 guide the second occluding body 13 when the position of the second occluding body 13 with respect to the first occluding body 10 is changed. Preferably, the extending direction of the guide shaft 18 and the guide hole 17 is parallel to the axial direction of the axial plugging device, the guide shaft 18 and the guide hole 17 may be in a fixed installation mode of interference fit, or the guide hole 17 is a threaded hole, the guide shaft 18 is a bolt, and the guide shaft 18 and the guide hole 17 are fixedly connected through threads. In order to limit the floatable range between the first occluding body 10 and the second occluding body 13, it is preferable that the bolt tip is provided with a stopper flange, as shown in fig. 2, by which the stopper flange acts on the outside of the hole where the second occluding body 13 is slidably engaged with the guide shaft 18, thereby limiting the maximum distance between the first occluding body 10 and the second occluding body 13. Further, by changing the depth to which the guide shaft 18 is screwed into the guide hole 17 (i.e., the threaded hole), the magnitude of the maximum distance between the above-described first and second occluding bodies 10 and 13 can be changed to be suitable for the hole structure in which the distances of the first and second end surfaces M1 and M2 are different.

According to the axial plugging device of the preferred embodiment, during the plugging operation, the axial plugging device moves in the axial direction of the cell structure, so that a part of the second plugging body 13 extends into the hole between the first end surface M1 and the second end surface M2 of the cell structure, and the second plugging end 121 of the second plugging body 13 is first pressed against the second end surface M2 of the cell structure. The force is continuously applied to press the first occluding body 12 of the first occluding body 10 against the first end surface M1 of the hole structure (i.e., the outer surface of the workpiece on which the hole structure is located), while the second occluding body 13 approaches the first occluding body 10 in the guiding direction of the guide shaft 18 against the elastic force of the elastic member 16. The first plugging end 12 plugs the first end surface M1 of the hole structure by an external force applied to the axial plugging device, and the second plugging end 121 plugs the second end surface M2 by an elastic force of the elastic member 16, thereby achieving axial plugging of the hole structure. In the tightness detection process, the axial plugging device plugs the hole structure of the workpiece to be detected, and then the workpiece to be detected is subjected to vacuum pumping measurement, so that a relatively accurate workpiece tightness detection result is obtained.

Preferably, as shown in fig. 2, an axial gap S2 is provided between the first occluding body 10 and the second occluding body 13 in the axial direction, and the axial gap S2 and the radial gap S1 communicate with each other, so as to provide more floatable space when the first occluding body 10 and the second occluding body 13 approach each other. When the axial plugging device plugs a hole structure such as the surface of an engine cylinder body, as shown in fig. 3, under the condition that the first plugging end 12 is pressed against the first end surface M1 of the hole structure and the second plugging end 121 is pressed against the second end surface M2 of the hole structure, the cavity space S3 of the hole structure between the first end surface M1 and the second end surface M2 forms a closed space together with the axial gap S2 and the radial gap S1, so that the plugging and sealing effects are achieved.

In order to further improve the sealing, it is preferred that, as shown in fig. 3 and 4, the end face of the first plugging end 12 of the axial plugging device is protrudingly provided with at least one first elastic sealing ring 19; and/or the end face of the second plugging end 121 is protrudingly provided with at least one second elastic sealing ring 20. The first elastic seal ring 19 and the second elastic seal ring 20 may be made of an elastic material such as rubber or elastic metal. Therefore, the axial plugging device is in flexible contact with the hole structure through the first elastic sealing ring 19 and the second elastic sealing ring 20, so that the workpiece is prevented from being scratched, and the sealing performance is further improved.

In the process of detecting the sealing performance, the axial plugging device of the preferred embodiment of the application can realize axial plugging of a pore structure, and can realize uniformly distributed axial pressing force more easily, and the contact area of plugging pressing is relatively larger. Compare in traditional radial plugging device, this axial plugging device is more even in whole atress under the shutoff state, sealed effect when having improved the shutoff, and then makes the result that the leakproofness detected more accurate.

The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present application within the technical idea of the present application, and these simple modifications all belong to the protection scope of the present application.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in the present application.

In addition, any combination of the various embodiments of the present application is also possible, and the same should be considered as disclosed in the present application as long as it does not depart from the idea of the present application.