CN214274899U - Quick connector for hydrostatic test - Google Patents
Quick connector for hydrostatic test Download PDFInfo
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- CN214274899U CN214274899U CN202022547754.2U CN202022547754U CN214274899U CN 214274899 U CN214274899 U CN 214274899U CN 202022547754 U CN202022547754 U CN 202022547754U CN 214274899 U CN214274899 U CN 214274899U
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Abstract
The utility model discloses a hydrostatic test fast-assembling connects, it is including sealed lid, connect the base, the connecting rod and install a plurality of card foot in connecting the base, sealed lid and the equal cover of joint base are established on the connecting rod, sealed lid can be driven on the connecting rod be close to or keep away from and connect the base, a plurality of card foot is around the connecting rod setting in connecting the base, the position that corresponds every card foot on connecting the base all is equipped with the through-hole, the one end of card foot is located the through-hole, the one end of card foot can slide in the through-hole, wherein, when sealed lid is close to and connects the base, the one end of card foot can be driven stretches out outside connecting the base along the through-hole, when sealed lid was kept away from and is connected the base, the one end of card foot can be driven and is retrieved in connecting the base along the through-hole. The utility model provides a hydrostatic test quick-assembling joint, it has avoided the problem of revealing of thread sealing, can be applied to the coupling of different pipe diameters, and need not to increase the flange for the pressure testing, and it is convenient to dismantle, does not receive the restriction of test pressure.
Description
Technical Field
The utility model relates to a test fixture technical field especially relates to a hydrostatic test fast-assembling joint.
Background
The hydraulic test is one of the essential technologies for checking the product quality in the industrial pipeline manufacturing process, taking a boiler as an example, the hydraulic test is carried out on similar boiler elements such as a steam drum, a header, a desuperheater and the like when the manufacturing is finished so as to check whether the material and the pressure-bearing requirement of a welding opening meet the design requirement and the relevant regulations of national pressure vessel acceptance.
Finished boiler elements, to which pipe joints are often welded, are produced in a manufacturing plant and must be plugged when carrying out a hydraulic test. The traditional mode is a thread sealing mode or a flange sealing mode, the thread sealing mode is generally only suitable for small-diameter pipe joints and low-pressure test places, although flange sealing is widely used, the pressure testing cost is increased by the mode, and meanwhile, the two sealing modes are troublesome to install and time-consuming.
Therefore, in combination with the above-mentioned technical problems, a new technical solution is needed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a dismantle conveniently, not restricted by experimental pressure, applicable hydrostatic test fast-assembling joint in different pipe diameter coupling.
In order to realize the purpose of the utility model, the utility model provides a hydraulic test quick connector, which comprises a sealing cover, a connector base, a connecting rod and a plurality of clamping feet arranged in the connector base, the sealing cover and the joint base are sleeved on the connecting rod, the sealing cover can be driven on the connecting rod to be close to or far away from the joint base, a plurality of clamping feet are arranged around the connecting rod in the joint base, a through hole is arranged on the joint base corresponding to each clamping pin, one end of each clamping pin is positioned in the through hole, one end of each clamping pin can slide in the through hole, wherein when the sealing cover is close to the joint base, one end of the clamping pin can be driven to extend out of the joint base along the through hole, when the sealing cover is far away from the joint base, one end of the clamping pin can be driven to retract into the joint base along the through hole.
Furthermore, the connecting rod further comprises a top supporting rod, the top supporting rod is sleeved on the connecting rod and is located between the sealing cover and the joint base, and one end of the top supporting rod is connected with the sealing cover.
Furthermore, the top stay bar is in a hollow tubular shape, the axial direction of the top stay bar is consistent with the length direction of the connecting rod, the top stay bar is sequentially provided with a body part, a transition part and a working part along the axial direction, the body part is connected with the sealing cover, the outer diameter of the working part is smaller than that of the body part, and the body part and the working part are in transition through the transition part.
Furthermore, the axial direction of the sealing cover is consistent with the length direction of the connecting rod, the end face, facing the joint base, of the sealing cover is a sealing face, a threaded counter bore is formed in the sealing face inwards along the axial direction of the sealing cover, an external thread is arranged on the connecting rod, and the sealing cover is in threaded connection with one end of the connecting rod.
Further, the sealing cover is sequentially provided with an installation part and a sealing part along the axis direction of the sealing cover, the sealing part is close to the top support rod, and the outer diameter of the installation part is smaller than that of the sealing part.
Furthermore, a sealing counter bore is arranged on the sealing surface.
Furthermore, the joint base comprises a base wall and a bottom plate, the base wall is in a hollow tubular shape, the axis direction of the base wall is consistent with the length direction of the connecting rod, a plurality of notches are formed in one end of the base wall along the circumferential direction of the base wall, the bottom plate is fixedly installed at one end of the base wall, provided with the notches, an accommodating cavity is formed between the base wall and the bottom plate, the working part of the top supporting rod is inserted into the accommodating cavity, and the clamping foot is located between the base wall and the top supporting rod.
Furthermore, the device also comprises a transmission rod, and two ends of the transmission rod are respectively rotatably connected with the working part and the clamping pin.
Furthermore, the cross section of the clamping foot is in an L shape and comprises a protruding part and a driving part, the length direction of the protruding part is consistent with the radial direction of the seat wall, the length direction of the driving part is consistent with the axial direction of the seat wall, the protruding part is located in the notch, the driving part is abutted against the outer wall of the top support rod, the transmission rod is rotatably connected to the corner position of the clamping foot, and the length of the transmission rod is smaller than that of the driving part.
Furthermore, the other end of the connecting rod is fixedly connected with the bottom plate, or a shaft hole is formed in the axis position of the bottom plate, the other end of the connecting rod penetrates through the shaft hole, and an adjusting nut is connected to one side, far away from the seat wall, of the bottom plate on the connecting rod in a threaded mode.
Compared with the prior art, the hydraulic test quick coupler of the application has one or more of the following beneficial effects:
(1) the hydraulic test quick connector avoids the leakage problem of thread sealing, and can be applied to sealing of pipe joints with different pipe diameters;
(2) the quick connector for the hydrostatic test does not need to be additionally provided with a pressure test flange, is convenient to disassemble, reduces the pressure test cost, and is not limited by the test pressure;
(3) the utility model provides a hydrostatic test ready-packaged joint, it passes joint base part threaded connection at the connecting rod has adjusting nut, can realize the reservation distance between butt joint base and the sealed lid through the position of adjusting nut on the connecting rod to increase the suitability of this application quick-attach joint to different thickness coupling.
Drawings
FIG. 1 is a schematic axial cross-sectional view of a hydrostatic test quick coupler in an unscrewed state as provided in accordance with an embodiment of the present application;
FIG. 2 is a schematic view of the positions of the clamping legs of the hydraulic test quick coupler in an unscrewed state according to an embodiment of the present application;
FIG. 3 is a schematic axial cross-sectional view of a hydrostatic test quick coupler in a fastened condition as provided in accordance with an embodiment of the present application;
FIG. 4 is a schematic view of the positions of the clamping legs of the hydraulic test quick coupler in a fastened state according to an embodiment of the present disclosure;
fig. 5(a) -5 (d) are schematic views illustrating the hydraulic test quick coupler provided in the first embodiment of the present application in different positions inside the pipe joint.
The sealing structure comprises a sealing cover 1, a sealing surface 11, a sealing surface 12, a thread counter bore 13, a sealing counter bore 14, a mounting part 15, a sealing part 2, a joint base 21, a seat wall 22, a bottom plate 3, a clamping foot 31, an extending part 32, a driving part 32, a top supporting rod 4, a body part 41, a transition part 42, a working part 43, a connecting rod 5, a transmission rod 6, an adjusting nut 7 and a pipe joint 8.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the present invention, the following detailed description is given to the embodiments, structures, features and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1 to 5, fig. 1 is a schematic axial cross-sectional view of a quick coupler for a hydraulic test in an unscrewed state according to an embodiment of the present application; FIG. 2 is a schematic view of the positions of the clamping legs of the hydraulic test quick coupler in an unscrewed state according to an embodiment of the present application; FIG. 3 is a schematic axial cross-sectional view of a hydrostatic test quick coupler in a fastened condition as provided in accordance with an embodiment of the present application; FIG. 4 is a schematic view of the positions of the clamping legs of the hydraulic test quick coupler in a fastened state according to an embodiment of the present disclosure; fig. 5(a) -5 (d) are schematic views illustrating the hydraulic test quick coupler provided in the first embodiment of the present application in different positions inside the pipe joint.
Example one
The embodiment provides a hydraulic test quick coupler, which comprises a sealing cover 1, a top supporting rod 4, a connecting rod 5, a joint base 2 and a plurality of clamping feet 3 arranged in the joint base 2, and is shown in fig. 1. The axial direction of the top stay bar 4 and the axial direction of the connecting rod 5 are consistent with the axial direction of the joint base 2, the sealing cover 1, the top stay bar 4 and the joint base 2 are sequentially sleeved on the connecting rod 5, and one end of the top stay bar 4 is connected with the sealing cover 1.
As shown in fig. 3, the sealing cover 1 preferably has a structure shape with one end having a smaller outer diameter as the mounting portion 14 of the sealing cover 1 and the other end having a larger outer diameter as the sealing portion 15 of the sealing cover 1, that is, the sealing cover 1 has the mounting portion 14 and the sealing portion 15 in this order along the axial direction thereof. The sealing part 15 is close to the top stay 4, and the end face of the sealing part 15 facing the top stay 4 is a sealing face 11. When the hydraulic test quick connector is installed on the pipe joint 8, the sealing cover 1 is positioned outside the pipe joint 8, and when the quick connector is fastened, the sealing surface 11 of the sealing part 15 is tightly attached to the opening end of the pipe joint 8, so that the sealing of the pipe joint 8 is realized. In practical implementation, the radial cross section of the sealing portion 15 is preferably circular, but the shape of the sealing portion 15 may be triangular, quadrangular, or other shapes, as long as the sealing surface 11 can completely cover the opening of the pipe joint 8 when the sealing portion 15 is tightly attached to the opening end of the pipe joint 8. Similarly, the cross-sectional shape of the mounting portion 14 may be circular, triangular, quadrangular or other shapes, and the smaller outer diameter dimension and the corresponding cross-sectional shape design may enable a user to fasten the sealing cover 1 more conveniently and more easily through the mounting portion 14. As shown in fig. 3, the sealing cover 1 is provided with a threaded counter bore 12 inwardly from the sealing surface 11 along the axial direction thereof, the connecting rod 5 is provided with an external thread, and the sealing cover 1 is in threaded connection with one end of the connecting rod 5. The threaded counter bore 12 is formed to the inside of the mounting part 14, so that sufficient insertion space can be provided for the connecting rod 5 when the sealing cover 1 is fastened, and the fastening firmness of the sealing cover 1 is ensured.
In a further embodiment, the sealing surface 11 is provided with a sealing counterbore 13. In practical implementation, the shape of the sealing counter bore 13 is adapted to the opening end of the pipe joint 8 to be sealed. When the sealing cover 1 is fastened, the open end of the pipe joint 8 can be just inserted into the sealing counter bore 13, and the sealing effect of the sealing cover 1 is further ensured. Of course, in order to further improve the sealing effect of the sealing cover 1, a sealing element, such as a sealing ring or a sealing gasket, may be installed in the sealing counterbore 13.
As shown in fig. 3, the top stay 4 is a hollow tube, and includes a main body 41, a transition portion 42, and an operating portion 43 in this order along the axial direction. The outer diameter of the working portion 43 is smaller than that of the body portion 41, and the body portion 41 and the working portion 43 are transited by the transition portion 42. The top supporting rod 4 is sleeved on the connecting rod 5, and in order to enable the top supporting rod 4 to better slide on the connecting rod 5, the position, where the top supporting rod 4 is sleeved on the connecting rod 5, preferably adopts a smooth outer wall surface design. Of course, the above is only a preferable solution, and the position where the connecting rod 5 is sleeved with the top stay 4 may also be provided with an external thread. The main body 41 is connected to the sealing surface 11, and when the sealing cover 1 is tightened, the top stay 4 can move toward the joint base 2 under the driving of the sealing cover 1. During specific implementation, because the sealing cover 1 is in threaded fit with the connecting rod 5 to rotate so as to drive the top supporting rod 4 to move on the connecting rod 5, and the top supporting rod 4 cannot rotate, a connecting structure is further arranged at the joint of the sealing cover 1 and the top supporting rod 4, through the connecting structure, the top supporting rod 4 can move on the connecting rod 5 along with the sealing cover 1 in a translation manner, and can also not rotate along with the sealing cover 1 when the sealing cover 1 rotates, and the connecting structure is common, so that the details are not repeated in the embodiment.
As shown in fig. 3, the joint base 2 preferably takes the form of a combination of a base wall 21 and a bottom plate 22. The base wall 21 is in a hollow tubular shape, a plurality of notches are formed in one end of the base wall 21 in the circumferential direction, the bottom plate 22 is fixedly mounted at the end, provided with the notches, of the base wall 21 through bolts, an accommodating cavity is formed between the base wall 21 and the bottom plate 22, and the notches are formed into through holes which are communicated with the accommodating cavity and have the axial direction consistent with the radial direction of the joint base 2. The working part 43 of the top stay 4 is inserted into the accommodating cavity, and the clamping foot 3 is installed between the seat wall 21 and the top stay 4. Due to the design of the split type joint base 2, the clamping pins 3 can be more conveniently installed in the joint base 2 when the quick connector is assembled. It should be noted that the joint base 2 may not be a split design, but is an integral structure, for example, the joint base 2 is a cylindrical structure with an opening at one end, the side wall of the structure is the position corresponding to the seat wall 21, and the bottom of the structure is the position corresponding to the bottom plate 22. The lateral wall of the joint base 2 is provided with a through hole corresponding to each clamping pin 3, and the axial direction of the through hole is consistent with the radial direction of the joint base 2.
As shown in fig. 2 to 4, the present embodiment preferably employs three clamping legs 3 which are distributed at equal angles along the circumferential direction of the joint base 2. Of course, the number of the clamping pins 3 is not limited, and may be other numbers. The section of the clamping foot 3 is in an L shape, and comprises a protruding part 31 and a driving part 32. The protruding portion 31 of the present embodiment is preferably perpendicular to the driving portion 32, but the protruding portion 31 may also have a set angle with the driving portion 32, but in practical implementation, the direction of the notch or through hole on the joint base 2 is also adjusted accordingly. The longitudinal direction of the extension portion 31 coincides with the radial direction of the joint base 2, and the longitudinal direction of the drive portion 32 coincides with the axial direction of the joint base 2. The protrusion 31 is located in the notch or in the through hole. The driving portion 32 interferes with the outer wall of the top stay 4. The clamping foot 3 is connected with the top supporting rod 4 through a transmission rod 6. Preferably, a connecting portion for rotatably connecting one end of the driving rod 6 is extended outward from the end of the working portion 43 of the driving rod 6, and the other end of the driving rod 6 is rotatably connected to a corner position of the chuck pin 3. It should be noted that, in practical implementation, the length of the transmission rod 6 is smaller than the length of the driving portion 32, so that it can be ensured that the driving portion 32 of the detent 3 can always abut against the outer wall of the top stay 4, so that the transmission rod 6 always forms an included angle with the moving direction of the top stay 4, and it can be prevented that if the transmission rod 6 is long, the transmission rod 6 can be parallel to the moving direction of the top stay 4, which causes a phenomenon that a quick connector cannot be fastened due to self-locking. Meanwhile, the connection part of the transmission rod 6 can be designed into a strip through hole and can be arranged at any connection position with the top support rod 4 or the clamping foot 3. Both can make card foot 3 when contradicting with the side inner wall that connects base 2 like this, sealed lid 1 can also continue the rotating certain distance, guarantees sealed lid 1's leakproofness, still slides on the 4 outer walls of top stay bar in order to make card foot 3 easier simultaneously, prevents that card foot 3 card from dying.
As shown in fig. 1 or fig. 3, an adjustable structural design is preferably adopted between the connecting rod 5 and the joint base 2 in this embodiment, that is, an axial hole is formed at an axial position of the bottom plate 22 or the bottom of the joint base 2, and the other end of the connecting rod 5 passes through the axial hole. Similarly, a thread structure is also arranged at one end of the connecting rod 5 penetrating through the shaft hole, and an adjusting nut 7 is connected to the connecting rod 5 through a thread at one side of the bottom plate 22 or the bottom far away from the base wall 21 or the side wall, that is, an adjusting nut 7 is connected to the part of the connecting rod 5 penetrating through the shaft hole through a thread. Through the adjustment adjusting nut 7 position on connecting rod 5 can realize the reservation distance between butt joint base 2 and the sealed lid 1 to increase this application quick connect to the suitability of different thickness coupling 8. It should be understood that the other end of the connecting rod 5 may also be directly and fixedly connected to the bottom plate 22 or the bottom of the joint base 2, for example, by welding, gluing, screwing, or integrally forming, but the applicability of this structure is not as good as that of the adjustable structure.
The working principle of the quick coupler for the hydraulic test specifically comprises the following steps:
Example two
The present embodiment is different from the first embodiment in that the sealing cover 1 is a split structure, that is, the mounting portion 14 and the sealing portion 15 of the sealing cover 1 are two separate structures, the threaded counter bore 12 in the mounting portion 14 of the sealing cover 1 is a portion with threads, and the threaded counter bore 12 in the sealing portion 15 is a portion without threads. Meanwhile, the top stay 4 and the sealing surface 11 of the sealing part 15 are fixedly connected by welding, gluing, bolts or other connection methods. In practical implementation, the sealing part 15 of the sealing cover 1 and the top support rod 4 are sleeved on the connecting rod 5 together, and when the quick-assembly joint is fastened, the sealing effect similar to that of the embodiment can be realized only by rotating the mounting part 14 of the sealing cover 1. Meanwhile, when the quick coupler is disassembled, the mounting part 14 of the sealing cover 1 is unscrewed, then the sealing part 15 of the sealing cover 1 is pulled to drive the top supporting rod 4 to move towards the direction far away from the coupler base 2, and then the clamping pin 3 is contracted towards the central shaft direction of the coupler base 2 under the pulling of the transmission rod 6. Except for the differences of the sealing cover 1, other structures and working principles of the first embodiment are applicable to the first embodiment, and therefore are not described herein again.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A hydraulic test quick connector is characterized by comprising a sealing cover (1), a connector base (2), a connecting rod (5) and a plurality of clamping feet (3) arranged in the connector base (2), wherein the sealing cover (1) and the connector base (2) are sleeved on the connecting rod (5), the sealing cover (1) can be driven on the connecting rod (5) to be close to or away from the connector base (2), the clamping feet (3) are arranged in the connector base (2) in a surrounding manner around the connecting rod (5), through holes are formed in the connector base (2) corresponding to the clamping feet (3), one ends of the clamping feet (3) are located in the through holes, one ends of the clamping feet (3) can slide in the through holes,
when the sealing cover (1) is close to the joint base (2), one end of the clamping pin (3) can be driven to extend out of the joint base (2) along the through hole, and when the sealing cover (1) is far away from the joint base (2), one end of the clamping pin (3) can be driven to retract into the joint base (2) along the through hole.
2. The hydraulic test quick coupler of claim 1, further comprising a top brace (4), wherein the top brace (4) is sleeved on the connecting rod (5), the top brace (4) is located between the sealing cover (1) and the coupler base (2), and one end of the top brace (4) is connected with the sealing cover (1).
3. A hydraulic test quick coupler according to claim 2, characterized in that the top stay (4) is hollow tubular, the axial direction of the top stay (4) is consistent with the length direction of the connecting rod (5), the top stay (4) is provided with a main body part (41), a transition part (42) and a working part (43) along the axial direction thereof in sequence, the main body part (41) is connected with the sealing cover (1), the outer diameter of the working part (43) is smaller than that of the main body part (41), and the transition part (42) is arranged between the main body part (41) and the working part (43).
4. The quick coupler for the hydrostatic test according to claim 2, characterized in that the axial direction of the sealing cover (1) is consistent with the length direction of the connecting rod (5), the end surface of the sealing cover (1) facing the coupler base (2) is a sealing surface (11), the sealing cover (1) is provided with a threaded counter bore (12) inwards from the sealing surface (11) along the axial direction of the sealing cover, the connecting rod (5) is provided with an external thread, and the sealing cover (1) is in threaded connection with one end of the connecting rod (5).
5. The hydraulic test quick coupler of claim 4, characterized in that the sealing cover (1) is provided with a mounting portion (14) and a sealing portion (15) in sequence along the axial direction of the sealing cover, the sealing portion (15) is close to the top stay (4), and the outer diameter of the mounting portion (14) is smaller than that of the sealing portion (15).
6. A hydrostatic test quick coupler as set forth in claim 4 wherein the sealing face (11) is provided with a sealing counterbore (13).
7. The quick connector for the hydrostatic test according to claim 3, characterized in that the connector base (2) includes a base wall (21) and a bottom plate (22), the base wall (21) is hollow and tubular, an axial direction of the base wall (21) is consistent with a length direction of the connecting rod (5), one end of the base wall (21) is provided with a plurality of notches along a circumferential direction thereof, the bottom plate (22) is fixedly installed at the end of the base wall (21) provided with the notches, an accommodating cavity is formed between the base wall (21) and the bottom plate (22), the working portion (43) of the top brace (4) is inserted into the accommodating cavity, and the clamping leg (3) is located between the base wall (21) and the top brace (4).
8. The hydraulic test quick coupler of claim 7, further comprising a transmission rod (6), wherein both ends of the transmission rod (6) are rotatably connected with the working portion (43) and the clamping leg (3), respectively.
9. A hydraulic test quick coupler according to claim 8, characterized in that the cross-section of the locking pin (3) is shaped as an "L", and comprises a protrusion (31) and a driving portion (32), the length direction of the protrusion (31) is consistent with the radial direction of the seat wall (21), the length direction of the driving portion (32) is consistent with the axial direction of the seat wall (21), the protrusion (31) is located in the notch, the driving portion (32) is abutted against the outer wall of the top stay (4), the transmission rod (6) is rotatably connected at the corner position of the locking pin (3), and the length of the transmission rod (6) is smaller than the length of the driving portion (32).
10. The hydrostatic test quick coupler of claim 7, characterized in that the other end of the connecting rod (5) is fixedly connected with the bottom plate (22), or an axial hole is formed in the axial position of the bottom plate (22), the other end of the connecting rod (5) passes through the axial hole, and an adjusting nut (7) is connected to the connecting rod (5) through a thread on one side of the bottom plate (22) far away from the seat wall (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022547754.2U CN214274899U (en) | 2020-11-06 | 2020-11-06 | Quick connector for hydrostatic test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022547754.2U CN214274899U (en) | 2020-11-06 | 2020-11-06 | Quick connector for hydrostatic test |
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| Publication Number | Publication Date |
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| CN214274899U true CN214274899U (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022547754.2U Active CN214274899U (en) | 2020-11-06 | 2020-11-06 | Quick connector for hydrostatic test |
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| CN (1) | CN214274899U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114923051A (en) * | 2022-05-27 | 2022-08-19 | 冰山松洋生物科技(大连)有限公司 | Joint structure, incubator sterilization system and use method |
-
2020
- 2020-11-06 CN CN202022547754.2U patent/CN214274899U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114923051A (en) * | 2022-05-27 | 2022-08-19 | 冰山松洋生物科技(大连)有限公司 | Joint structure, incubator sterilization system and use method |
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