CN219608332U - Air tightness test plugging mechanism and air tightness test device - Google Patents

Abstract

The utility model relates to an air tightness test plugging mechanism, which is characterized by comprising the following components: the inner expansion shaft is provided with a mounting groove in the radial direction, and the side wall of the inner expansion shaft is provided with a first limit part and a second limit part at intervals; the sleeve piece is sleeved outside the inner expansion shaft, and the sleeve piece and the inner expansion shaft can mutually and axially move; the force application assembly is movably connected with the inner expansion shaft and is in limit fit with the first limit part; the limiting piece is in limiting fit with the second limiting part when the inner expanding shaft moves; the sealing piece is sleeved on the mounting groove, two ends of the sealing piece are respectively in limit fit with one end face of the sleeve piece and the groove wall of the mounting groove, and the sealing piece can be elastically deformed. Only one direction of power source is needed to apply force, the reliability is strong, and the plugging efficiency is improved.

Description

Air tightness test plugging mechanism and air tightness test device

Technical Field

The utility model relates to the technical field of air tightness detection equipment, in particular to an air tightness test plugging mechanism and an air tightness test device.

Background

Along with the progress of industrialization, when the product is subjected to air tightness detection, a plurality of holes needing to be plugged exist in the detected product, and when the end face of the hole is subjected to finish machining and enough space is reserved for arranging plugs, the common practice is to plug the holes, for example, a rivet pulling mode and a sealant filling mode are adopted for plugging. The existing plugging process mostly adopts manual plugging or automatic plugging equipment for automatic plugging, the process efficiency of the manual plugging is lower, the plugging effect is difficult to ensure, and the improvement of productivity is not facilitated. The existing automatic plugging equipment is complex in operation, complex in structure, poor in reliability and stability and easy to fail due to the influence of positioning accuracy and different apertures, and is unfavorable for improving the working efficiency.

Disclosure of Invention

Based on the above, it is necessary to provide an air tightness test plugging mechanism and an air tightness test device for solving the problems of low plugging efficiency and poor reliability in the current air tightness test, so as to effectively improve the reliability and the working efficiency of the plugging process in the air tightness test.

The technical scheme is as follows: an air tightness test plugging mechanism, the air tightness test plugging mechanism comprising: the inner expansion shaft is provided with a mounting groove in the radial direction, and the side wall of the inner expansion shaft is provided with a first limit part and a second limit part at intervals; the sleeve piece is sleeved outside the inner expansion shaft, and the sleeve piece and the inner expansion shaft can mutually and axially move; the force application assembly is movably connected with the inner expansion shaft and is in limit fit with the first limit part, the first limit part is in limit fit with one end face of the sleeve piece, and the force application assembly is used for pushing the inner expansion shaft and the sleeve piece to move along the axial direction of the inner expansion shaft; the limiting piece is in limiting fit with the second limiting part when the inner expanding shaft moves; the sealing piece is sleeved on the mounting groove, two ends of the sealing piece are respectively in limit fit with one end face of the sleeve piece and the groove wall of the mounting groove, and the sealing piece can be elastically deformed.

According to the air tightness test plugging mechanism, in the working process, the inner expansion shaft is automatically stretched into a hole to be plugged in a manual or robot grabbing mode, then the external driving device is used for driving the force application assembly to move, the sleeve piece and the inner expansion shaft are driven to move, in the axial movement process, the second limiting part of the inner expansion shaft can form limiting fit with the limiting piece, the inner expansion shaft stops moving, the inner expansion shaft is movably connected with the force application assembly, the inner expansion shaft moves relative to the sleeve piece under the condition of continuously applying force, one end face of the sleeve piece is extruded and sleeved with the sealing piece on the mounting groove, the sealing piece is elastically deformed, the length is shortened, the diameter is enlarged, and accordingly sealing fit with the hole to be plugged is achieved. When the plugging is required to be removed, the external driving device removes the force applied to the force application assembly, and when the sealant returns to the original state, the sleeve member and the inner expansion shaft axially move in the opposite direction. Through the actions, the automatic plugging and releasing of the holes can be realized, only one direction of power source is needed for applying force, the reliability is high, and the plugging efficiency is improved.

In one embodiment, the air tightness test plugging mechanism further comprises a first reset piece, wherein the first reset piece is connected between the force application assembly and one side surface of the first limiting part, which is opposite to the sleeve piece, and the first reset piece is used for providing an axial reset force for the inner expansion shaft.

In one embodiment, the force application assembly comprises a supporting seat and a mounting seat, the sleeve member is connected with the mounting seat, a movable channel is formed between the supporting seat and one end face of the sleeve member, a through hole is formed in the supporting seat, the through hole is opposite to the sleeve member, the through hole is used for allowing the inner expanding shaft to pass through, the first limiting part moves in the movable channel, and two opposite ends of the first reset member are respectively in supporting fit with the outer wall of the through hole and the first limiting part.

In one embodiment, the air tightness test plugging mechanism further comprises a fixing seat, the limiting piece is movably connected with the fixing seat, and the fixing seat is used for installing and assembling the tested workpiece.

In one embodiment, the fixing seat is provided with an adjusting part, the limiting piece is movably connected with the adjusting part through a fastening piece, and the limiting piece can axially move on the adjusting part relative to the fixing seat.

In one embodiment, the adjusting part comprises a plurality of adjusting holes, the adjusting holes are arranged on the fixing seat at intervals along the axial direction of the inner expanding shaft, and the limiting piece is in fastening fit with the adjusting holes through a fastening piece.

In one embodiment, a blocking piece is arranged at one end of the inner expansion shaft, which is far away from the force application component, the blocking piece is detachably connected with the inner expansion shaft, and the sealing piece is arranged between the blocking piece and the groove wall of the mounting groove.

In one embodiment, the air tightness test plugging mechanism further comprises a second reset piece and a guide piece, the guide piece is connected with the fixed seat, the force application assembly is in guide fit with the guide piece, the second reset piece is arranged between the fixed seat and the force application assembly, the force application assembly is in reset fit with the second reset piece, and the second reset piece is used for providing reset force for the force application assembly, which is far away from the fixed seat.

In one embodiment, the number of the second resetting pieces and the number of the guiding pieces are at least two, the two guiding pieces are arranged on the fixing seat at intervals, the force application assembly is in guiding fit with the at least two guiding pieces, and the second resetting pieces and the guiding pieces are arranged in one-to-one correspondence.

The air tightness testing device comprises a driving piece and any one of the air tightness testing plugging mechanism, wherein the driving piece is in driving fit with the force application assembly, and the driving piece is used for driving the force application assembly to move along the axial direction of the inner expansion shaft.

According to the air tightness testing device, in the working process, the inner expansion shaft is automatically stretched into the hole to be plugged in a manual or robot grabbing mode, then the external driving device is used for driving the force application assembly to move, the sleeve piece and the inner expansion shaft are driven to move, in the axial movement process, the second limiting part of the inner expansion shaft can form limiting fit with the limiting piece, the inner expansion shaft stops moving, the inner expansion shaft is movably connected with the force application assembly, the inner expansion shaft moves relative to the sleeve piece under the condition of continuing to apply force, one end face of the sleeve piece is extruded and sleeved with the sealing piece on the mounting groove, the sealing piece is elastically deformed, the length is shortened, the diameter is enlarged, and accordingly sealing fit with the hole to be plugged is achieved. When the plugging is required to be removed, the external driving device removes the force applied to the force application assembly, and when the sealant returns to the original state, the sleeve member and the inner expansion shaft axially move in the opposite direction. Through the actions, the automatic plugging and releasing of the holes can be realized, only one direction of power source is needed for applying force, the reliability is high, and the plugging efficiency is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of the overall structure of an airtight test plugging mechanism according to an embodiment.

Fig. 2 is a schematic view showing the internal structure of the inner expansion shaft and the sleeve member according to an embodiment.

Fig. 3 is a schematic structural diagram of another view of fig. 1.

Reference numerals illustrate:

100. the air tightness test plugging mechanism; 110. an inner expansion shaft; 111. a first limit part; 112. a second limit part; 113. a mounting groove; 114. a first reset member; 115. a baffle; 120. a sleeve member; 130. a force application assembly; 131. a supporting seat; 132. a mounting base; 133. perforating; 140. a limiting piece; 141. a fixing seat; 142. an adjusting section; 150. a seal; 160. a second reset member; 161. a guide.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1, fig. 2 and fig. 3, fig. 1 is a schematic diagram illustrating an overall structure of an airtight test plugging mechanism according to an embodiment of the utility model. Figure 2 shows a schematic view of the internal structure of the inner expansion shaft and sleeve member according to an embodiment of the present utility model. Fig. 3 shows a schematic structural diagram of another view of fig. 1. An embodiment of the present utility model provides an airtight test plugging mechanism 100, which includes: inner expansion shaft 110, sleeve member 120, force application assembly 130, stop member 140 and seal member 150. The radial direction of the inner expansion shaft 110 is provided with a mounting groove 113, and the side wall of the inner expansion shaft 110 is provided with a first limit part 111 and a second limit part 112 at intervals. The sleeve member 120 is sleeved outside the inner expansion shaft 110, and the sleeve member 120 and the inner expansion shaft 110 can move axially relative to each other. The inner expansion shaft 110 is movably connected with the force application assembly 130, the force application assembly 130 is in limit fit with the first limit part 111, the first limit part 111 is in limit fit with one end surface of the sleeve member 120, and the force application assembly 130 is used for pushing the inner expansion shaft 110 and the sleeve member 120 to move along the axial direction of the inner expansion shaft 110. When the inner expansion shaft 110 moves, the limiting piece 140 is in limiting fit with the second limiting part 112. The sealing member 150 is sleeved on the mounting groove 113, two ends of the sealing member 150 are respectively in limit fit with one end face of the sleeve member 120 and the groove wall of the mounting groove 113, and the sealing member 150 can be elastically deformed.

According to the air tightness test plugging mechanism 100, in the working process, the inner expansion shaft 110 is automatically stretched into a hole to be plugged in a manual or robot grabbing manner, then the external driving device is used for driving the force application assembly 130 to move to drive the sleeve member 120 and the inner expansion shaft 110 to move, in the axial movement process, the second limiting part 112 of the inner expansion shaft 110 can form limiting fit with the limiting part 140, so that the inner expansion shaft 110 stops moving, the inner expansion shaft 110 is movably connected with the force application assembly 130, the inner expansion shaft 110 continuously applies force to relatively move relative to the sleeve member 120, one end face of the sleeve member 120 presses the sealing member 150 sleeved on the mounting groove 113, the sealing member 150 is elastically deformed, the length is shortened, and the diameter is increased, and sealing fit with the hole to be plugged is achieved. When the plugging needs to be removed, the external driving device removes the force applied to the force application assembly 130, and when the sealant returns to the original state, the sleeve member 120 and the inner expansion shaft 110 axially move in the opposite direction. Through the actions, the automatic plugging and releasing of the holes can be realized, only one direction of power source is needed for applying force, the reliability is high, and the plugging efficiency is improved.

Alternatively, the seal 150 may be an elastomeric rubber, a sealant, a rubber of spring construction, or other sealing material.

Specifically, referring to fig. 1, the sealing member 150 is a sealant sleeve. The sealant sleeve is arranged on the mounting groove 113 and sleeved on the radial direction of the inner account shaft. Therefore, the sealing device is simple in structure, low in cost, high in reliability, capable of being repeatedly used and good in sealing effect. The present embodiment provides only one specific embodiment of the sealing member 150, but is not limited thereto.

In one embodiment, referring to fig. 1 and 2, the sleeve member 120 is provided with a guiding groove, and the second limiting portion 112 extends out of the guiding groove and is in guiding engagement with the guiding groove, and the length direction of the guiding groove is parallel to the axial direction of the sleeve member 120. Therefore, during the movement of the inner expansion shaft 110, the second limiting part 112 can form a limit with the limiting member 140 to prevent the inner expansion shaft 110 from moving forward, and can form a guiding fit with the guiding groove, so that the stability of the inner expansion shaft 110 and the sleeve member 120 during the relative movement is improved.

In one embodiment, referring to fig. 1, 2 and 3, the airtight test plugging mechanism 100 further includes a first reset element 114. The first restoring member 114 is connected between the force application assembly 130 and a side surface of the first limiting portion 111 facing away from the sleeve member 120, and the first restoring member 114 is configured to provide an axial restoring force to the inner expanding shaft 110. Thus, upon unblocking, the force application assembly 130 is not acted upon by a force, and the first restoring member 114 is capable of providing a restoring force to the inner shaft 110 such that the inner shaft 110 returns to its original position on the sleeve member 120.

Alternatively, the first restoring member 114 may be a spring, a dome, an elastic rubber, an elastic foam, a balloon, or other elastic material or structure.

Specifically, the first restoring member 114 is a spring. Thus, the air tightness test plugging mechanism 100 has the advantages of simple structure, good resetting effect and long service life, and is beneficial to improving the working reliability of the air tightness test plugging mechanism 100. The embodiment provides only a specific structure of the first reset element 114, but is not limited thereto.

In one embodiment, referring to fig. 1, 2 and 3, the force application assembly 130 includes a contact base 131 and a mounting base 132. The sleeve member 120 is connected to the mounting base 132, and a movable channel is formed between the abutting base 131 and an end surface of the sleeve member 120. The abutting seat 131 is provided with a through hole 133, the through hole 133 is opposite to the sleeve member 120, the through hole 133 is used for allowing the inner expansion shaft 110 to pass through, the first limiting portion 111 moves in the moving channel, and opposite ends of the first reset member 114 are in abutting fit with the outer wall of the through hole 133 and the first limiting portion 111 respectively. Therefore, during the force application process, the abutting seat 131 and the mounting seat 132 move synchronously to drive the inner expansion shaft 110 and the sleeve member 120 to move, when the second limiting portion 112 of the inner expansion shaft 110 and the limiting member 140 form a limit, the inner expansion shaft 110 does not move forward any more, the abutting seat 131 and the mounting seat 132 move forward continuously to drive the sleeve member 120 to move forward, the first limiting portion 111 moves axially in the movable channel towards the wall of the through hole 133, and at this time, the first limiting portion 111 compresses the first reset member 114, so that the end surface of the sleeve member 120 presses the sealing member 150 on the inner expansion shaft 110, so that the sealing member 150 deforms to realize the blocking effect.

In one embodiment, referring to fig. 1, the airtight test plugging mechanism 100 further includes a fixing base 141, the limiting member 140 is movably connected with the fixing base 141, and the fixing base 141 is used for installing and assembling the tested workpiece. In this way, the fixing seat 141 can fix the whole air tightness test plugging mechanism 100 on the plugged workpiece, so that force application is convenient, and the limiting piece 140 can be installed conveniently.

Further, referring to fig. 2, the fixing base 141 is provided with an adjusting portion 142, the limiting member 140 is movably connected with the adjusting portion 142 by a fastener, and the limiting member 140 can axially move on the adjusting portion 142 relative to the fixing base 141. Therefore, the position of the limiting member 140 on the fixing seat 141 can be adjusted by the adjusting portion 142, so that the positioning position of the inner expansion shaft 110 can be adjusted, and the deformation degree of the sealing member 150 can be adjusted, so that the sealing member is suitable for plugging with different apertures.

In one embodiment, referring to fig. 1 and 2, the adjusting portion 142 includes a plurality of adjusting holes, the adjusting holes are disposed on the fixing base 141 at intervals along the axial direction of the inner expanding shaft 110, and the limiting member 140 is fastened and engaged with the adjusting holes by a fastener. For example, the adjustment portion 142 includes four adjustment holes, and the stopper 140 is fastened to be engaged with two of the adjustment holes by two bolts. Therefore, the adjusting mode is high in reliability, difficult to loosen and beneficial to ensuring the stability and reliability of work.

In one embodiment, referring to fig. 1 and 2, a stop 115 is disposed at an end of the inner expansion shaft 110 away from the force application assembly 130. The baffle 115 is detachably connected to the inner expansion shaft 110, and the sealing member 150 is disposed between the baffle 115 and the groove wall of the mounting groove 113. Therefore, the detachable form of the blocking piece 115 is advantageous in that the installation and replacement of the sealing member 150 are facilitated, and the operational convenience is improved.

In one embodiment, referring to fig. 1 and 3, the airtight test plugging mechanism 100 further includes a second reset element 160 and a guide element 161. The guide member 161 is connected with the fixing seat 141, the force application assembly 130 is in guiding fit with the guide member 161, the second reset member 160 is arranged between the fixing seat 141 and the force application assembly 130, the force application assembly 130 is in resetting fit with the second reset member 160, and the second reset member 160 is used for providing reset force for the force application assembly 130 far away from the fixing seat 141. In this manner, second return member 160 facilitates return of force assembly 130, and the guiding action provided by guide 161 facilitates an improved return accuracy of force assembly 130.

Specifically, referring to fig. 1 and 2, the guide member 161 is a guide post, the second return member 160 is a return spring, the return spring is sleeved on the guide post, the mounting seat 132 is provided with a guide hole, and the guide post is in guide fit with the guide hole on the mounting seat 132. Therefore, it is advantageous to ensure the stability and reliability of the reset of the force application assembly 130.

Further, referring to fig. 1 and 3, the number of the second restoring members 160 and the number of the guiding members 161 are at least two, the two guiding members 161 are disposed on the fixing base 141 at intervals, the force application assembly 130 is in guiding fit with the at least two guiding members 161, and the second restoring members 160 and the guiding members 161 are disposed in one-to-one correspondence. Therefore, the reset effect and the overall structural stability are further improved.

In one embodiment, an air tightness testing device (not shown in the drawings) includes a driving member and the air tightness testing plugging mechanism 100 of any of the above, wherein the driving member is in driving engagement with the force application assembly 130, and the driving member is used for driving the force application assembly 130 to move along the axial direction of the inner expansion shaft 110.

According to the air tightness testing device, in the working process, the inner expansion shaft 110 is automatically stretched into a hole to be plugged in a manual or robot grabbing manner, then the external driving device is used for driving the force application assembly 130 to move, the sleeve member 120 and the inner expansion shaft 110 are driven to move, in the axial movement process, the second limiting part 112 of the inner expansion shaft 110 can form limiting fit with the limiting part 140, so that the inner expansion shaft 110 stops moving, the inner expansion shaft 110 is movably connected with the force application assembly 130, the inner expansion shaft 110 moves relatively to the sleeve member 120 under the continuous force application, one end face of the sleeve member 120 presses the sealing member 150 sleeved on the mounting groove 113, the sealing member 150 is elastically deformed, the length is shortened, and the diameter is enlarged, so that the sealing fit with the hole to be plugged is realized. When the plugging needs to be removed, the external driving device removes the force applied to the force application assembly 130, and when the sealant returns to the original state, the sleeve member 120 and the inner expansion shaft 110 axially move in the opposite direction. Through the actions, the automatic plugging and releasing of the holes can be realized, only one direction of power source is needed for applying force, the reliability is high, and the plugging efficiency is improved.

The driving member may be a cylinder, a hydraulic cylinder, a motor or other driving device.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The utility model provides a gas tightness test shutoff mechanism which characterized in that, gas tightness test shutoff mechanism includes:

the inner expansion shaft is provided with a mounting groove in the radial direction, and the side wall of the inner expansion shaft is provided with a first limit part and a second limit part at intervals;

the sleeve piece is sleeved outside the inner expansion shaft, and the sleeve piece and the inner expansion shaft can mutually and axially move;

the force application assembly is movably connected with the inner expansion shaft and is in limit fit with the first limit part, the first limit part is in limit fit with one end face of the sleeve piece, and the force application assembly is used for pushing the inner expansion shaft and the sleeve piece to move along the axial direction of the inner expansion shaft;

the limiting piece is in limiting fit with the second limiting part when the inner expanding shaft moves;

the sealing piece is sleeved on the mounting groove, two ends of the sealing piece are respectively in limit fit with one end face of the sleeve piece and the groove wall of the mounting groove, and the sealing piece can be elastically deformed.

2. The air tightness testing and plugging mechanism according to claim 1, further comprising a first restoring member connected between said force application assembly and a side of said first limiting portion facing away from said sleeve member, said first restoring member being adapted to provide an axial restoring force to said inner expanding shaft.

3. The air tightness test plugging mechanism according to claim 2, wherein the force application assembly comprises an abutting seat and a mounting seat, the sleeve member is connected with the mounting seat, a movable channel is formed between the abutting seat and one end face of the sleeve member, the abutting seat is provided with a through hole, the through hole is opposite to the sleeve member, the through hole is used for allowing the inner expanding shaft to pass through, the first limiting part moves in the movable channel, and two opposite ends of the first reset member are in abutting fit with the outer wall of the through hole and the first limiting part respectively.

4. The air tightness test plugging mechanism according to claim 1, further comprising a fixing base, wherein the limiting member is movably connected with the fixing base, and the fixing base is used for installing and assembling a tested workpiece.

5. The airtight test plugging mechanism according to claim 4, wherein the fixing base is provided with an adjusting portion, the limiting piece is movably connected with the adjusting portion through a fastening piece, and the limiting piece can axially move on the adjusting portion relative to the fixing base.

6. The air tightness test plugging mechanism according to claim 5, wherein the adjusting portion comprises a plurality of adjusting holes, the adjusting holes are arranged on the fixing base at intervals along the axial direction of the inner expanding shaft, and the limiting piece is in fastening fit with the adjusting holes through a fastening piece.

7. The air tightness testing and plugging mechanism according to claim 4, wherein a blocking piece is arranged at one end of the inner expansion shaft far away from the force application assembly, the blocking piece is detachably connected with the inner expansion shaft, and the sealing piece is arranged between the blocking piece and the groove wall of the mounting groove.

8. The air tightness testing and plugging mechanism according to claim 4, further comprising a second reset member and a guide member, wherein the guide member is connected with the fixing base, the force application assembly is in guide fit with the guide member, the second reset member is disposed between the fixing base and the force application assembly, the force application assembly is in reset fit with the second reset member, and the second reset member is used for providing a reset force for the force application assembly, which is far away from the fixing base.

9. The air tightness test plugging mechanism according to claim 8, wherein the number of the second reset pieces and the number of the guide pieces are at least two, the two guide pieces are arranged on the fixing seat at intervals, the force application assembly is in guide fit with the at least two guide pieces, and the second reset pieces and the guide pieces are arranged in one-to-one correspondence.

10. The air tightness testing device is characterized by comprising a driving piece and the air tightness testing blocking mechanism according to any one of claims 1-9, wherein the driving piece is in driving fit with the force application assembly, and the driving piece is used for driving the force application assembly to move along the axial direction of the inner expansion shaft.