CN220018861U

CN220018861U - Instrument gas tightness test fixture

Info

Publication number: CN220018861U
Application number: CN202321133178.4U
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Hangzhou Weijing Medical Robot Co ltd
Current assignee: Hangzhou Weijing Medical Robot Co ltd
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-11-14
Anticipated expiration: 2033-05-11

Abstract

The utility model relates to the technical field of air tightness detection, in particular to an instrument air tightness testing tool, which comprises a tool main body, wherein a first jack penetrating through the tool main body is arranged; the connecting end is arranged at the second end of the tool main body and is connected with the first jack; the elastic block is arranged at the first end of the tool main body, and is provided with a second jack penetrating through the elastic block, and the second jack is communicated with the first jack; the movable piece is used for fixing and compressing the elastic block on the first end of the tool main body; the utility model has simple structure, adopts the two parts of the tool main body and the extrusion part, not only can fix the elastic block, but also can fix and seal the instrument rod, and has rapid and efficient operation; the both ends of elastic block are round platform form, when compressing the elastic block, and the elastic block produces deformation for the diameter at second jack both ends reduces, produces extrusion cohesion to the apparatus pole, through the form of cohesion at second jack both ends, can ensure the gas tightness that the apparatus pole detected, improves detection accuracy.

Description

Instrument gas tightness test fixture

Technical Field

The utility model relates to the technical field of air tightness detection, in particular to an instrument air tightness testing tool.

Background

Minimally invasive surgery refers to a surgical mode for performing surgery in a human cavity by using modern medical instruments such as laparoscopes, thoracoscopes and related devices. Compared with the traditional operation mode, the minimally invasive operation has the advantages of small wound, light pain, quick recovery and the like. However, the minimally invasive instrument in the minimally invasive surgery is limited by the size of the incision, so that the operation difficulty is greatly increased, and actions such as fatigue, tremble and the like of a doctor in the long-time operation process can be amplified, which becomes a key factor for restricting the development of the minimally invasive surgery technology. With the development of robot technology, a new minimally invasive medical field technology, namely minimally invasive surgery robot technology, capable of overcoming the defects and inheriting the advantages, has been developed.

A common minimally invasive surgical robot consists of a physician console, a patient surgical platform, and a display device, where the surgeon operates an input device and passes the input to the patient surgical platform connected to a teleoperated surgical instrument. The patient operation platform comprises a surgical instrument which penetrates into the patient body, the end part of the surgical instrument is pulled by a steel wire rope, the steel wire rope penetrates through a small hole of a sealing cover at the end part of the surgical instrument, the small hole is not easy to be too small or too large, the driving of the steel wire rope is affected by too small, and the air tightness of the instrument is affected by too large.

The Chinese patent with the publication number of CN217560894U discloses a lower fixing seat, a rotating seat, a rubber ring and an upper fixing seat, wherein the rotating seat is detachably and fixedly connected with the upper fixing seat, the rotating seat is detachably, hermetically and fixedly connected with the lower fixing seat after being fixed with the upper fixing seat, the rubber ring is limited in a central hole of the upper fixing seat and limited by the rotating seat, a detection hole which is used for the surgical instrument to pass through and can be in sealing contact with the outer wall of the surgical instrument is formed in the center of the rubber ring, an air cavity is formed in the lower fixing seat and communicated with the detection hole, an interface which is used for being connected with a micro-pressure pump and a testing host machine in a gas phase is arranged outside the lower fixing seat, and the interface is communicated with the air cavity.

The scheme comprises a plurality of fixing structures of the lower fixing seat, the rotating seat and the upper fixing seat, and is complex in structure and long in installation time; in order to ensure the air tightness, the inner diameter of the rubber ring is smaller, the instrument is difficult to insert, and the instrument and the rubber ring are easy to damage; and if the inner diameter of the rubber ring is larger, after the instrument is inserted into the rubber ring for fixation, the instrument and the rubber ring are not tightly held due to insufficient holding force when the test inflation is carried out, so that the risk of air leakage exists.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides an instrument air tightness testing tool.

In order to solve the technical problems, the utility model is solved by the following technical scheme:

an instrument air tightness test fixture comprises,

the tool body is provided with a first jack penetrating through the tool body;

the connecting end is arranged at the second end of the tool main body and is connected with the first jack to be used for connecting an air tightness detector;

the elastic block is arranged at the first end of the tool main body, a second jack penetrating through the elastic block is arranged on the elastic block, and the second jack is communicated with the first jack;

the movable piece is fixed and compresses the elastic block on the first end of the tool main body in a state that the first end of the tool rod connected with the tool head stretches into the first jack from the second jack, and the tool rod and the first end of the tool main body are compressed to form a seal.

Preferably, at least one end of the elastic block is in a shape of a truncated cone in an axial direction of the second insertion hole.

Preferably, the movable member includes a pressing portion, a connecting portion and a third insertion hole,

the first end of the connecting part is connected with the first end of the extruding part, and the second end of the connecting part is connected with the tool main body; the extrusion part can do reciprocating motion along the axial direction of the first jack through the connecting part;

the third jack penetrates through the extrusion part and is communicated with the first jack and the second jack;

the extrusion part moves towards the direction of the tool main body, so that the first end of the extrusion part and the first end of the tool main body extrude the elastic block, and the elastic block deforms to compress the instrument rod and the first end of the tool main body.

Preferably, a first conical cavity is arranged at the first end of the tool main body, and the first conical cavity is communicated with the first jack and is used for accommodating the elastic block; the cavity surface of the first conical cavity is matched with the elastic block;

the first conical cavity is used for guiding the deformation direction of the elastic block so as to compress the elastic block to the instrument rod.

Preferably, a second conical cavity is arranged on the first end of the extrusion part, and the second conical cavity is communicated with the third jack and is used for accommodating the elastic block; the cavity surface of the second conical cavity is matched with the elastic block;

the second conical cavity is used for guiding the deformation direction of the elastic block so as to compress the elastic block to the instrument rod.

Preferably, the connection mode of the tool main body and the movable piece comprises threaded connection, plug connection or clamping connection.

Preferably, the connecting part is a connecting sleeve; the connecting sleeve is in threaded connection with the first end of the tool main body and/or the first end of the extrusion part.

Preferably, the elastic block has a size smaller than an inner diameter of the connection sleeve in an axial direction perpendicular to the second insertion hole.

Preferably, a limiting protrusion is arranged at the first end of the tool main body and/or the first end of the extrusion part;

in the axial direction of the first jack, the limiting protrusion is used for limiting the connecting sleeve so as to limit the extrusion part to further compress the elastic block.

Preferably, the first receptacle, the second receptacle and the third receptacle are each in clearance fit with the instrument stem and the instrument head.

The utility model has at least the following beneficial effects:

1. the utility model has simple structure, adopts the two parts of the tool main body and the extrusion part, not only can fix the elastic block, but also can fix and seal the instrument rod, and has rapid and efficient operation.

2. The both ends of elastic block are round platform form, when compressing the elastic block, and the elastic block produces deformation for the diameter at second jack both ends reduces, produces extrusion cohesion to the apparatus pole, through the form of cohesion at second jack both ends, can ensure the gas tightness that the apparatus pole detected, improves detection accuracy.

Drawings

FIG. 1 is a schematic view of an instrument air tightness test tool, an instrument bar and an instrument head in the utility model;

FIG. 2 is a schematic diagram of an instrument air tightness test fixture according to the present utility model;

FIG. 3 is a cross-sectional view taken along the direction A-A in FIG. 2;

FIG. 4 is a cross-sectional view of the instrument air tightness test tool, the instrument bar and the instrument head of the utility model;

FIG. 5 is an exploded view of the tool for testing the air tightness of the instrument in the utility model;

FIG. 6 is a cross-sectional view of an instrument air tightness test fixture of the present utility model;

FIG. 7 is a first schematic view of an elastomeric block according to the present utility model;

FIG. 8 is a second schematic view of an elastomeric block according to the present utility model;

FIG. 9 is a schematic view of a tooling body according to the present utility model;

fig. 10 is a schematic view of an instrument head and an instrument stem of the present utility model.

The names of the parts indicated by the numerical references in the drawings are as follows:

110. a tool main body; 111. a limit protrusion; 120. a connecting end; 130. an instrument bar; 131. an instrument head; 140. an extrusion part; 141. a third jack; 150. a connection part; 310. a first jack; 320. an elastic block; 321. a second jack; 330. a first conical cavity; 340. a second conical cavity.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples. It is to be understood that the examples are illustrative of the present utility model and are not intended to be limiting.

As shown in fig. 1-10, the present embodiment provides an instrument air tightness test fixture, which includes,

the tool body 110 is provided with a first jack 310 penetrating through the tool body 110;

the connecting end 120 is arranged at the second end of the tool main body 110, and is connected with the first jack 310 for connecting with an air tightness detector;

the elastic block 320 is arranged at the first end of the tool main body 110, and a second jack 321 penetrating through the elastic block 320 is arranged on the elastic block 320, and the second jack 321 is communicated with the first jack 310;

the movable member fixes and compresses the elastic block 320 on the first end of the tool main body 110 in a state that the first end of the tool rod 130 connected with the tool head 131 extends into the first jack 310 from the second jack 321, so as to compress the tool rod 130 and the first end of the tool main body 110 to form a seal.

With the configuration in this embodiment, in use, first, the first end of the instrument bar 130 to which the instrument head 131 is connected passes through the second insertion hole 321 and extends into the third insertion hole 141, and then the elastic block 320 is moved to approach the tool main body 110; connecting the connecting end 120 with the air tightness detector, and extruding the elastic block 320 through the extrusion of the movable piece to deform the first end of the tool main body 110 and the instrument rod 130 passing through the second jack 321, so that the inner side wall of the second jack 321 is tightly extruded on the instrument rod 130, and simultaneously, the elastic block 320 is tightly extruded on the first end of the tool main body 110, so that the sealing between the elastic block 320 and the instrument rod 130 and between the elastic block 320 and the tool main body 110 is realized; at this time, the first jack 310 is inflated through the air tightness detector, so that certain air pressure exists in the first jack 310, and after inflation is completed, the air pressure value in the first jack 310 is monitored by the air tightness detector, so that the air tightness of the monitoring instrument is achieved.

It can be known that since the first end of the first insertion hole 310 is sealed by the elastic block 320 and the second end of the first insertion hole 310 is connected to the air tightness detector, the air charged into the first insertion hole 310 is not leaked; at this time, gas can only escape through the wire hole on the instrument head 131 in the first insertion hole 310;

further, the air pressure in the first jack 310 is detected in real time by the air tightness detector, and the change of the air pressure value in the first jack 310 is obtained by the air tightness detector in a set detection time; if the variation of the air pressure value in the first jack 310 is within the variable range, the size of the wire hole at the instrument head 131 is up to standard, and if the variation of the air pressure value in the first jack 310 is beyond the variable range, the size of the wire hole at the instrument head 131 is not up to standard.

In this embodiment, the movable member includes a pressing portion 140, a connecting portion 150 and a third insertion hole 141,

the pressing part 140 is arranged at the first end of the tool main body 110;

the first end of the connecting portion 150 is connected to the first end of the extruding portion 140, and the second end is connected to the tool main body 110; the pressing part 140 may reciprocate along the axial direction of the first insertion hole 310 through the connection part 150;

the third jack 141 is disposed through the pressing part 140, and the third jack 141 communicates with the first jack 310 and the second jack 321;

the pressing portion 140 moves toward the tool main body 110, so that the first end of the pressing portion 140 and the first end of the tool main body 110 press the elastic block 320, and the elastic block 320 deforms to press the instrument bar 130 and the first end of the tool main body 110.

The setting of the connection portion 150 includes at least the following cases:

1) The first end of the connecting part 150 is fixedly connected with the first end of the extruding part 140, and the second end of the connecting part 150 is movably connected with the first end of the tool main body 110; the connecting part 150 can reciprocate along the axial direction of the first jack 310 relative to the tool main body 110;

2) The first end of the connecting part 150 is movably connected with the first end of the extruding part 140, and the second end of the connecting part 150 is fixedly connected with the first end of the tool main body 110; the connection part 150 is reciprocally movable with respect to the pressing part 140 in the axial direction of the third insertion hole 141;

3) The first end of the connecting part 150 is movably connected with the first end of the extruding part 140, and the second end of the connecting part 150 is movably connected with the first end of the tool main body 110; the connecting part 150 can reciprocate along the axial direction of the first insertion hole 310 or the third insertion hole 141 relative to the tool body 110 and the pressing part 140;

in this embodiment, the mode of 1) is adopted, that is, the first end of the connecting portion 150 is fixedly connected with the first end of the extruding portion 140, and the second end of the connecting portion 150 is movably connected with the first end of the tool main body 110; the connection part 150 may reciprocate in an axial direction of the first insertion hole 310 with respect to the tool body 110.

Through the configuration in this embodiment, when in use, the first end of the instrument rod 130 connected with the instrument head 131 passes through the third jack 141, passes through the second jack 321, and finally stretches into the first jack 310, the air tightness detector is mounted on the connection end 120, the extrusion part 140 is driven, so that the extrusion part 140 and the connection part 150 move towards the direction of the tool main body 110, in the process, the first end of the extrusion part 140 moves towards the direction of the elastic block 320, and pushes the elastic block 320 to move towards the direction of the tool main body 110 until the elastic block 320 contacts with the tool main body 110, at this time, the extrusion part 140 continues to move towards the direction of the tool main body 110, so that the extrusion part 140 and the tool main body 110 jointly form a clamping effect on the elastic block 320, and when the extrusion part 140 continues to move towards the direction of the tool main body 110, the extrusion part 140 and the tool main body 110 further extrude the elastic block 320, so that the elastic block 320 deforms, on one hand, a sealing effect is formed between the elastic block 320 and the first end of the tool main body 110, and on the other hand, the deformation of the elastic block 320 compresses the inner side wall of the second jack 321 against the instrument rod 130 to form a sealing effect; then, the air tightness detector fills air into the first jack 310, so that a certain air pressure value is achieved in the first jack 310, and then the air pressure in the first jack 310 is detected within a set detection time through the air tightness detector, so that detection is completed.

After the detection is completed, the pressing part 140 and the connecting part 150 are driven to move in a direction away from the tool main body 110, in the process, the deformation of the elastic block 320 is gradually reduced until the elastic block is restored, and at this time, the instrument rod 130 and the instrument head 131 can be taken out from the first jack 310, the second jack 321 and the third jack 141; the other instrument bar 130 and instrument head 131 may then be inspected.

It should be noted that, through the arrangement of the extrusion part 140, the elastic block 320 can be better matched with the tool main body 110 to achieve the purpose of extrusion, thereby driving the elastic block 320 to deform to achieve the sealing effect and facilitating the operation; through the arrangement of the connecting part 150, the moving direction of the extruding part 140 can be guided better, the detection stability is improved, and meanwhile, the connecting part 150 can play a certain role in protecting the elastic block 320;

further, when the elastic block 320 is damaged due to long-term use and is not satisfied, the elastic block 320 can be removed for repair or replacement by releasing the connection between the connection portion and the tool body 110.

In this embodiment, at least one end of the elastic block 320 is in a shape of a truncated cone in the axial direction of the second insertion hole 321.

It should be noted that, for the arrangement of the elastic block 320, at least the following cases are included:

i, one end of the elastic block 320 facing the extrusion part 140 is in a truncated cone shape;

II, one end of the elastic block 320 facing the tool main body 110 is in a round table shape;

III, the end part of the elastic block 320 facing the extrusion part 140 and the end part facing the tool main body 110 are in a round table shape;

in this embodiment, the above-mentioned mode iii is adopted, that is, the end of the elastic block 320 facing the pressing portion 140 and the end facing the tool main body 110 are both in a truncated cone shape.

When the extrusion part 140 pushes the elastic block 320 to move towards the tool main body 110 until the elastic block 320 contacts the tool main body 110, at this time, the extrusion part 140 continues to push the elastic block 320 to move; taking the end of the elastic block 320 close to the tool main body 110 as an example, under the continuous movement of the extrusion part 140, the extrusion part 140 and the tool main body 110 can extrude the elastic block 320, and because one end of the elastic block 320 is in a shape of a circular truncated cone, in this process, one end of the elastic block 320 can be extruded by the first end of the tool main body 110, so that one end of the elastic block 320 can have a trend of deforming towards the direction of the instrument rod 130, and because the instrument rod 130 is accommodated in the second jack 321, the deformation of the elastic block 320 can enable the inner side wall of the second jack 321 to hug the side wall of the instrument rod 130, thereby forming a seal between the inner side wall of the second jack 321 and the instrument rod 130.

It can be appreciated that, by the arrangement that the one end of the elastic block 320 is in the shape of a circular truncated cone, when the one end of the elastic block 320 is deformed by extrusion, a certain guiding effect is provided for the deformation direction of the one end of the elastic block 320, and the sealing effect between the inner sidewall of the second insertion hole 321 and the instrument rod 130 can be further improved.

Accordingly, the other end of the elastic block 320 has the above effect when pressing with the pressing portion 140.

In this embodiment, a first tapered cavity 330 is disposed at a first end of the tool main body 110, and the first tapered cavity 330 is communicated with the first jack 310 and is used for accommodating the elastic block 320; the cavity surface of the first conical cavity 330 is matched with the elastic block 320;

the first tapered cavity 330 is used to guide the deformation direction of the elastic block 320, so as to compress the elastic block 320 against the instrument bar 130.

It should be noted that, for the arrangement of the first conical cavity 330, at least the following cases are included:

A. in the axial direction of the first insertion hole 310, the size of the first tapered cavity 330 is smaller than the size of the elastic block 320;

B. in the axial direction of the first insertion hole 310, the size of the first tapered cavity 330 is not smaller than the size of the elastic block 320, that is, the size of the first tapered cavity 330 is equal to or larger than the size of the elastic block 320;

in this embodiment, the arrangement described in the above a is adopted, that is, the size of the first tapered cavity 330 is smaller than the size of the elastic block 320. Further, if the above-mentioned configuration B is adopted, a protruding structure is required to be disposed at the first end of the pressing portion 140, so that the elastic block 320 can be pressed in the first conical cavity 330 when the pressing portion 140 moves towards the tool main body 110, and meanwhile, a corresponding sealing effect is achieved.

Through the configuration in this embodiment, the first tapered cavity 330 is matched with the truncated cone shape at one end of the elastic block 320, when the extrusion part 140 extrudes the elastic block 320, one end of the elastic block 320 is attached to the first tapered cavity 330 and deforms along the extending direction of the side wall of the first tapered cavity 330, so that the deformation direction of the elastic block 320 is guided to the direction of the side wall of the instrument rod 130, and the effect that the elastic block 320 hugs the instrument rod 130 tightly is achieved.

In this embodiment, a second conical cavity 340 is disposed on the first end of the pressing portion 140, and the second conical cavity 340 is in communication with the third jack 141 and is configured to receive the elastic block 320; the cavity surface of the second conical cavity 340 is matched with the elastic block 320;

the second tapered cavity 340 is used for guiding the deformation direction of the elastic block 320, so as to compress the elastic block 320 to the instrument bar 130.

It should be noted that, for the arrangement of the second conical cavity 340, at least the following cases are included:

a. in the axial direction of the first insertion hole 310, the size of the second conical cavity 340 is smaller than the size of the elastic block 320;

b. the size of the second tapered cavity 340 is not smaller than the size of the elastic block 320 in the axial direction of the first insertion hole 310, that is, the size of the second tapered cavity 340 is equal to or larger than the size of the elastic block 320;

in this embodiment, the arrangement in the above-mentioned a is adopted, that is, the size of the second conical cavity 340 is smaller than the size of the elastic block 320 in the axial direction of the first insertion hole 310. Further, if the above-mentioned arrangement in the above-mentioned b is adopted, a protruding structure is required to be disposed on the first end of the tool main body 110, so that when the extruding portion 140 moves towards the tool main body 110, the elastic block 320 can be pressed in the second conical cavity 340, and meanwhile, a corresponding sealing effect is achieved.

Through the configuration in this embodiment, the second conical cavity 340 cooperates with the truncated cone shape at the other end of the elastic block 320, when the extrusion part 140 extrudes the elastic block 320, the other end of the elastic block 320 is attached to the second conical cavity 340 and deforms along the extending direction of the side wall of the second conical cavity 340, so that the deformation direction of the elastic block 320 is guided to the direction of the side wall of the instrument rod 130, and the effect that the elastic block 320 hugs the instrument rod 130 tightly to achieve sealing is achieved.

In this embodiment, the connection portion 150 is a connection sleeve.

Through the structure of the connecting portion 150 in this embodiment, the connecting portion 150 is sleeved on the first end of the tool main body 110 in a shape of a connecting sleeve, so that the elastic block 320 inside can be protected better, and meanwhile, a certain attractive effect can be achieved.

In this embodiment, the connecting portion 150 is screwed to the first end of the tool body 110 and/or the first end of the pressing portion 140.

In this embodiment, the connection manner between the tool main body 110 and the movable member includes a threaded connection, a plug connection, or a clamping connection.

It should be noted that, the arrangement of the connection portion 150 at least includes the arrangement modes of 1), 2) and 3), and in 1), the second end of the connection portion 150, that is, the second end of the connection sleeve is in threaded connection with the first end of the tool main body 110; in the above 2), the first end of the connection part 150, that is, the first end of the connection sleeve is screw-coupled with the first end of the pressing part 140; in 3), the first end of the connection sleeve is screwed with the first end of the pressing part 140, and the second end of the connection sleeve is screwed with the first end of the tool body 110;

since the arrangement of the above 1) is adopted in the present embodiment, the second end of the connecting portion 150, that is, the second end of the connecting sleeve is in threaded connection or plug connection or snap connection with the first end of the tool main body 110, and in the present embodiment, the second end of the connecting sleeve is in threaded connection with the first end of the tool main body 110; specifically, the inner side wall of the connecting sleeve is provided with an internal thread, and the first end of the tool main body 110 is provided with an external thread matched with the internal thread.

When testing is performed, the first end of the instrument rod 130 connected with the instrument head 131 passes through the third jack 141 and the second jack 321 until the first end of the instrument rod extends into the first jack 310, then the air tightness detector is installed on the connecting end 120, and then the extrusion part 140 is screwed, so that the extrusion part 140 moves towards the direction of the tool main body 110 through the threaded connection between the connecting part 150 and the first end of the tool main body 110 until the extrusion part 140 is matched with the tool main body 110 to extrude the elastic block 320, and a sealing effect is achieved; after the test is finished, the pressing part 140 is reversely screwed, so that the pressing part 140 moves in a direction away from the tool main body 110, the elastic block 320 is restored, and the instrument bar 130 and the instrument head 131 can be taken out.

Accordingly, by twisting the pressing part 140, the pressing part 140 moves toward a direction away from the tool main body 110, so that the connection between the connecting part 150 and the first end of the tool main body 110 can be released, the pressing part 140 and the tool main body 110 can be separated, the elastic block 320 can be taken out, and the elastic block 320 can be repaired or replaced.

In this embodiment, the dimension of the elastic block 320 is smaller than the inner diameter of the connecting sleeve in the axial direction perpendicular to the second insertion hole 321.

Through the setting that the size of elastic piece 320 is less than the inner diameter of connecting sleeve in this embodiment for when extrusion portion 140 and frock main part 110 extrude elastic piece 320, the space of elastic piece 320 certain deformation can be provided to the connecting sleeve inside, thereby makes elastic piece 320 can reach the deformation effect of preferred, further improves sealed effect.

In this embodiment, a first end of the tool main body 110 and/or a first end of the pressing portion 140 is provided with a limiting protrusion 111;

in the axial direction of the first insertion hole 310, the limiting protrusion 111 is configured to limit the connection sleeve, so as to limit the pressing portion 140 to further compress the elastic block 320.

Through the setting of spacing protruding 111 in this embodiment, when twisting extrusion portion 140 through connecting sleeve threaded connection frock main part 110 and towards the direction of frock main part 110, extrusion portion 140 can make elastic block 320 produce deformation with frock main part 110 extrusion jointly, after extrusion portion 140 moves to certain distance towards the direction of frock main part 110, connecting sleeve's second end and spacing protruding 111 contact, spacing protruding 111 forms spacing effect to connecting sleeve's removal this moment, make connecting sleeve can't continue to drive extrusion portion 140 and extrude elastic block 320 again, thereby can further protect elastic block 320, avoid excessive extrusion to make elastic block 320 damage.

Correspondingly, the position of the limiting protrusion 111 on the tool main body 110 can be set, so that the extrusion part 140 can extrude the elastic block 320 to enable the elastic block 320 to achieve a better deformation degree, and the elastic block 320 is not excessively extruded.

In this embodiment, the first receptacle 310, the second receptacle 321, and the third receptacle 141 are each in clearance fit with the instrument bar 130 and the instrument head 131.

By the configuration in the present embodiment, the first insertion hole 310, the second insertion hole 321, and the third insertion hole 141 are enabled to have sufficient space for the insertion of the instrument head 131 and the instrument bar 130, facilitating the operation.

In summary, the foregoing description is only of the preferred embodiments of the present utility model, and all equivalent changes and modifications made in accordance with the claims should be construed to fall within the scope of the utility model.

Claims

1. The utility model provides an apparatus gas tightness test fixture which characterized in that: comprising the steps of (a) a step of,

the tool body is provided with a first jack penetrating through the tool body;

2. The instrument air tightness test fixture of claim 1, wherein: in the axial direction of the second jack, at least one end of the elastic block is in a truncated cone shape.

3. The instrument air tightness test fixture according to claim 1 or 2, wherein: the movable piece comprises an extrusion part, a connecting part and a third jack,

4. The instrument air tightness test fixture of claim 2, wherein: a first conical cavity is formed in the first end of the tool main body, and the first conical cavity is communicated with the first jack and is used for accommodating the elastic block; the cavity surface of the first conical cavity is matched with the elastic block;

5. The instrument air tightness test fixture of claim 3, wherein: a second conical cavity is arranged at the first end of the extrusion part, and the second conical cavity is communicated with the third jack and is used for accommodating the elastic block; the cavity surface of the second conical cavity is matched with the elastic block;

6. The instrument air tightness test fixture of claim 1, wherein: the connection mode of the tool main body and the movable piece comprises threaded connection, plug connection or clamping connection.

7. The instrument air tightness test fixture of claim 3, wherein: the connecting part is a connecting sleeve; the connecting sleeve is in threaded connection with the first end of the tool main body and/or the first end of the extrusion part.

8. The instrument air tightness test fixture of claim 7, wherein: in the axial direction perpendicular to the second insertion hole, the size of the elastic block is smaller than the inner diameter of the connecting sleeve.

9. The instrument air tightness test fixture of claim 7, wherein: a limiting protrusion is arranged at the first end of the tool main body and/or the first end of the extrusion part;

10. The instrument air tightness test fixture of claim 3, wherein: the first receptacle, the second receptacle, and the third receptacle are each in clearance fit with the instrument stem and the instrument head.