Air tightness detection device for three-way ball valve

Abstract

The utility model discloses an air tightness detection device for a three-way ball valve. The air tightness detection device comprises a workbench, a plug assembly, an air pipe connector, an angle driving assembly and an inert gas output pipe. When air tightness detection needs to be carried out on the three-way ball valve, the two plug assemblies respectively plug the main valve port and the auxiliary valve port of the three-way ball valve, then external vacuum equipment is started, the interior of the ball valve is vacuumized through the air pipe connector, a certain amount of inert gas is blown to the periphery of the ball valve through the air output pipe, and the air tightness of the three-way ball valve is detected. Whether the internal air tightness of the ball valve meets the requirement or not is judged by detecting whether gas pumped out by vacuum equipment contains inert gas or not, after the ball valve at the current angle is detected, the other plug assembly blocks a second auxiliary valve port of the three-way ball valve, then the rotating driving mechanism drives a ball body in the ball valve to rotate by a certain angle, and then the ball valve is closed. And the inert gas is purged again, and the ball valve at the current angle is detected, so that multi-angle detection of the ball valve can be quickly realized.

Description

Technical Field

[0001] The present application relates to the field of ball valve manufacturing, and in particular to an air tightness detection device for a three-way ball valve. Background Art

[0002] T-type three-way ball valve is a valve commonly used in pipeline systems, usually composed of a ball, a valve stem, a valve seat and a valve body. There is a hole inside the ball, which can be rotated to control the flow direction of the fluid, thereby achieving diversion or mixing flow. In a T-type three-way ball valve, the ball usually has a T-shaped hole that can connect three pipes, so that the fluid can flow from one pipe to the other two pipes, or from any of the two pipes to the third pipe.

[0003] During the manufacturing process of the three-way ball valve, the air tightness of the three-way ball valve needs to be tested. However, the existing testing devices basically perform fixed-angle testing (the angle of the ball is fixed), while some high-demand products require testing whether the air tightness of the ball valve meets the requirements when the ball is at different angles. Therefore, there is an urgent need for a device that can meet multi-angle testing. Utility Model Content

[0004] The embodiment of the present application provides an air tightness detection device for a three-way ball valve, which can realize multi-angle detection of the ball valve and improve work efficiency.

[0005] The present application provides an air tightness detection device for a three-way ball valve, comprising a workbench, a plug assembly, an air pipe joint, an angle drive assembly, and an inert gas output pipe;

[0006] The workbench is arranged on the work surface, and a positioning mechanism for fixing the three-way ball valve is arranged on the workbench;

[0007] The three plug assemblies are respectively arranged corresponding to the three valve ports of the three-way ball valve; the plug assembly includes a telescopic mechanism and a plug, the telescopic mechanism is arranged on a workbench, the plug is connected to the telescopic end of the telescopic mechanism, and the plug is driven by the telescopic mechanism to block the valve port of the three-way ball valve;

[0008] The air pipe joint is arranged on any one of the plugs, and one end of the air pipe joint is used to communicate with the inside of the three-way ball valve, and the other end is communicated with the external vacuum equipment;

[0009] The angle driving assembly includes a rotary driving mechanism and a rotating block; the rotary driving mechanism is installed on a workbench, the rotating block is connected to the output end of the rotary driving mechanism, and the rotary block is driven to rotate by the rotary driving mechanism; a lock hole is provided on the rotating block, and the valve stem of the three-way ball valve is inserted into the lock hole;

[0010] The inert gas output pipe is arranged on the workbench and is used for spraying the inert gas to the three-way ball valve on the workbench.

[0011] The air tightness detection device for a three-way ball valve of the present application has at least the following beneficial effects:

[0012] The air tightness detection device of the present application includes a workbench, a plug assembly, an air pipe joint, an angle drive assembly and an inert gas output pipe; the plug assembly includes a telescopic mechanism and a plug, and the angle drive assembly includes a rotary drive mechanism and a rotating block. When the three-way ball valve needs to be tested for air tightness, the ball valve is positioned on the workbench through the positioning mechanism, and at the same time, the valve stem of the ball valve is aligned with the lock hole on the rotating block, and the lock hole and the valve stem fit each other. Then, the two plug assemblies respectively block the main valve port and the auxiliary valve port of the three-way ball valve, and the external vacuum equipment is started to evacuate the interior of the ball valve through the air pipe joint. Then, the inert gas output pipe sprays inert gas (such as helium) around the three-way ball valve. If the air tightness of the ball valve does not meet the requirements, the helium around the ball valve will be sucked into the interior of the ball valve, and due to the vacuum The equipment is directly connected to the inside of the ball valve through the air pipe joint, so the air pipe joint or vacuum equipment can be tested. If inert gas appears or the inert gas content exceeds the requirement, it is determined that the air tightness of the ball valve does not meet the requirement; after the ball valve detection at the current angle is completed, another plug assembly blocks the other auxiliary valve port of the three-way ball valve, and then the rotary drive mechanism drives the rotating block and the valve stem to rotate a certain angle, so that the ball inside the ball valve rotates a certain angle, and then the ball valve continues to be vacuumed and the inert gas is sprayed, so that multi-angle detection of the ball valve can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0014] Figure 1 is a schematic structural diagram of an airtightness detection device according to an embodiment of the present application;

[0015] Figure 2 yes Figure 1 A front view of

[0016] Figure 3 yes Figure 1 A partial schematic diagram of the air tightness detection device;

[0017] Figure 4 It is a schematic diagram of the ball valve installed on the air tightness detection device;

[0018] Figure 5 It is a partial structural schematic diagram of the plug assembly;

[0019] Figure 6 It is a schematic diagram of the structure of the angle drive component;

[0020] The description of the reference numerals is as follows: 10, workbench; 10a, mounting hole; 10b, center hole; 11, positioning mechanism; 111, positioning pin; 12, gantry;

[0021] 20, plug assembly; 20a, first plug assembly; 20b, second plug assembly; 20c, third plug assembly; 21, telescopic mechanism; 21a, telescopic end; 22, plug; 22a, annular sealing groove; 22b, sealing ring; 221, connecting sleeve;

[0022] 30. Trachea connector;

[0023] 40. Angle drive assembly; 41. Rotation drive mechanism; 42. Rotation block; 421. Connecting section; 422. Limiting section; 423. Matching section; 42a. Locking hole; 43. Limiting screw;

[0024] 50, ball valve; 51, connecting handle; 51a, positioning waist hole; 52, valve port; 52a, valve port end face;

[0025] 60. Inert gas output pipe. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0028] like Figure 1 and Figure 2 As shown, the present embodiment discloses an air tightness detection device for a three-way ball valve, the detection device comprises a workbench 10, a plug assembly 20, an air pipe joint 30, an angle drive assembly 40 and an inert gas output pipe 60, a positioning mechanism 11 for fixing the three-way ball valve 50 is arranged on the workbench 10; the three plug assemblies 20 are respectively arranged in one-to-one correspondence with the three valve ports 52 of the three-way ball valve 50; when the three-way ball valve 50 (T-type three-way ball valve) needs to be tested for air tightness, the positioning mechanism 11 fixes the ball valve 50, and then the three plug assemblies 20 block the three valve ports 52 of the ball valve 50, and the air pipe joint 30 is installed on the plug of any one of the plug assemblies 20 22 and connected to an external vacuum device (not shown), so as to evacuate the interior of the ball valve 50. Since the interior of the ball valve is in a vacuum or near-vacuum state, if the air tightness of the ball valve does not meet the requirements, the gas around the outside of the ball valve will be sucked into the interior of the ball valve. Therefore, during the test, a certain amount of inert gas is sprayed around the ball valve through the inert gas output pipe 60. Subsequently, the inert gas sensor and other structures can be used to detect whether the vacuum device has extracted the inert gas from the ball valve to determine the air tightness of the ball valve. The angle drive assembly 40 can drive the ball inside the ball valve 50 to rotate a certain angle to achieve multi-angle air tightness detection. The specific structure is described as follows:

[0029] like Figure 2 As shown, the workbench 10 is arranged on a work surface (such as the ground, etc.), and a positioning mechanism 11 for fixing the three-way ball valve 50 is provided on the workbench 10. The three-way ball valve 50 is fixed by the positioning mechanism 11 (specifically, the valve body is fixed), so that when the angle driving assembly 40 drives the ball inside the three-way ball valve 50 to rotate, the valve body of the ball valve 50 will not rotate along with it.

[0030] like Figure 3 and Figure 4 As shown, the positioning mechanism 11 includes a plurality of positioning pins 111 arranged on the workbench 10, the positioning pins 111 are vertically arranged on the workbench 10, and the positioning pins 111 protrude upward from the workbench 10, and a positioning waist hole 51a is arranged on the connecting handle 51 of the three-way ball valve 50, and the positioning pins 111 and the positioning waist hole 51a are arranged one by one ( Figure 4The positioning pin 111 is not shown in the figure, and the positioning pin 111 passes through the positioning waist hole 51a upwards, thereby realizing the positioning of the three-way ball valve 50. Among them, it is preferred that the two positioning pins 111 are arranged opposite to each other along the diagonal of the connecting handle 51. In this embodiment, the valve body of the three-way ball valve 50 cannot rotate in the horizontal direction through the cooperation of the positioning pin 111 and the positioning waist hole 51a, and the design of the positioning waist hole 51a can reduce the difficulty of aligning it with the positioning pin 111, thereby improving the efficiency of installation. In addition, the positioning mechanism 11 in this embodiment can also adopt other forms to realize the positioning of the ball valve body. For example, an electromagnet is installed on the workbench 10, and the electromagnet can adsorb the connecting handle 51 of the ball valve 50, thereby realizing the fixation of the valve body. When the electromagnet is powered off, the electromagnet and the connecting handle 51 of the ball valve 50 are disconnected from the adsorption.

[0031] like Figure 3 As shown, in some preferred embodiments, a plurality of mounting holes 10a are provided on the workbench 10, and the positioning pin 111 is threadedly connected in the mounting hole 10a. In this embodiment, according to the positioning requirements of different specifications of the ball valve 50, the positioning pin 111 can be selectively threadedly connected in any mounting hole 10a, which has good flexibility and is simple and quick.

[0032] like Figure 3 As shown, the inert gas output pipe 60 is an annular structure, and the inert gas output pipe 60 is connected to an external inert gas source (not shown), and the inert gas output pipe 60 is supplied with gas by the inert gas source, and the two are connected by a two-way valve, and the two-way valve can control the ejection of the gas source. Figure 4 As shown, from a top view, the projection of the three-way ball valve 50 in the height direction is surrounded by the inert gas output pipe 60, and the inert gas output pipe 60 is provided with a plurality of air holes (not shown) along its circumference, through which the inert gas is sprayed upward. The inert gas can be helium, argon, etc.

[0033] like Figure 4As shown, a gantry 12 is provided on the upper surface of the workbench 10. The gantry 12 has three sides, namely, two vertical sides and one horizontal side. Three plug assemblies 20 are respectively installed on the three sides of the gantry 12 in a one-to-one correspondence. Specifically, the three plug assemblies 20 are respectively called a first plug assembly 20a, a second plug assembly 20b and a third plug assembly 20c. The first plug assembly 20a and the second plug assembly 20b are respectively arranged on the two vertical sides of the gantry 12, and the third plug assembly 20c is respectively arranged on the two vertical sides of the gantry 12. Three plug assemblies 20c are arranged on the horizontal side of the gantry 12, and the three plug assemblies 20 correspond to the three valve ports 52 of the three-way ball valve 50 respectively, and are used to block the valve ports 52 of the three-way ball valve 50 to facilitate vacuuming inside the ball valve 50. Specifically, the three-way ball valve 50 includes a main valve port and two auxiliary valve ports, the third plug assembly 20c can be used to block the main valve port, and the first plug assembly 20a and the second plug assembly 20b are respectively used to block the two auxiliary valve ports.

[0034] like Figure 4 and Figure 5 As shown, the plug assembly 20 includes a telescopic mechanism 21 and a plug 22. The telescopic mechanism 21 can be a telescopic cylinder or an electric push rod, etc. The telescopic mechanism 21 is arranged on the vertical side or horizontal side of the gantry 12, wherein the telescopic mechanisms 21 of the first plug assembly 20a and the second plug assembly 20b are arranged relatively, and the telescopic directions of the telescopic mechanisms 21 of the two are on the same horizontal line, while the telescopic direction of the telescopic mechanism 21 of the third plug assembly 20c is the vertical direction. The plug 22 is connected to the telescopic end 21a of the telescopic mechanism 21, and the plug 22 is driven by the telescopic mechanism 21 to block the valve port 52 of the three-way ball valve 50, wherein the plug 22 is in the shape of a circular plate, and its outer diameter is larger than the inner diameter of the valve port 52, so that the valve port 52 can be completely blocked. When the valve port 52 needs to be blocked, the telescopic mechanism 21 drives the plug 22 to move toward the valve port 52, and the plug 22 fits and abuts against the end face 52a of the valve port, thereby achieving blocking.

[0035] like Figure 5 As shown, in some preferred embodiments, a side of the plug 22 facing the valve port 52 is provided with an annular sealing groove 22a, and the annular sealing groove 22a is coaxial with the valve port 52 corresponding to the plug 22; at least part of the sealing ring 22b (O-shaped elastic sealing ring) is provided in the annular sealing groove 22a, and when the plug 22 is pressed against the valve port end face 52a, the sealing ring 22b can be pressed between the plug 22 and the valve port end face 52a. In this embodiment, the gap between the valve port 52 and the plug 22 is sealed by using an elastically pressed sealing ring 22b, which can greatly improve the sealing performance and create a good foundation for the subsequent vacuuming of the ball valve 50.

[0036] like Figure 5As shown, in some preferred embodiments, the plug 22 is detachably connected to the telescopic end 21a of the telescopic mechanism 21, and the detachable connection method is, for example, magnetic connection or threaded connection. The preferred connection method is as follows: a connecting sleeve 221 is provided on the side of the plug 22 away from the valve port 52, and the connecting sleeve 221 is provided with an internal thread, and the telescopic end 21a of the telescopic mechanism 21 is provided with an external thread matching the internal thread, and the plug 22 is detachable through the threaded connection between the connecting sleeve 221 and the telescopic end 21a. Among them, the plug 22 is designed to be detachable, which can facilitate the replacement of the plug 22 according to the size of the valve port 52 of different specifications.

[0037] like Figure 4 and Figure 5 As shown, the trachea connector 30 is arranged on the plug 22 of any plug assembly 20, and the trachea connector 30 is penetrated on the plug 22, and when the plug 22 is sealed on the valve port 52, one end of the trachea connector 30 is connected to the inside of the three-way ball valve 50, and the other end of the trachea connector 30 is connected to the external vacuum equipment, and the external vacuum equipment can then realize vacuuming the inside of the ball valve 50. In this embodiment, it is preferred that the trachea connector 30 is arranged on the plug 22 of the third plug assembly 20c, and the outer circumference of the trachea connector 30 is sealed and connected with the plug 22 to avoid air leakage during vacuuming.

[0038] like Figure 3 and Figure 6 As shown, the angle driving assembly 40 includes a rotary driving mechanism 41 and a rotating block 42. The rotary driving mechanism 41 can be a motor or a rotary cylinder, etc. The rotary driving mechanism 41 is detachably arranged below the workbench 10 by bolts. The workbench 10 is provided with a center hole 10b coaxially corresponding to the third plug assembly 20c (specifically the telescopic mechanism 21), at least part of the rotating block 42 is coaxially inserted in the center hole 10b, and the lower end of the rotating block 42 is connected to the output end of the rotary driving mechanism 41, and the rotary block 42 can be driven to rotate by the rotary driving mechanism 41.

[0039] Among them, Figure 3 and Figure 6 As shown, the upper end surface of the rotating block 42 is coaxially provided with a lock hole 42a, and the valve stem of the three-way ball valve 50 is inserted downward into the lock hole 42a. When the rotating block 42 rotates, it can drive the valve stem of the three-way ball valve 50 to rotate, and the valve stem then drives the ball inside the three-way ball valve 50 to rotate a certain angle (the specific rotation angle is set according to actual needs). Preferably, the inner peripheral contour of the lock hole 42a is consistent with the outer peripheral contour of the valve stem. In this embodiment, the lock hole 42a is configured as a square hole, and the shape of the valve stem is configured as a rectangular body. When the valve stem is inserted into the lock hole 42a, the valve stem and the rotating block 42 cannot rotate relative to each other.

[0040] In other embodiments, the rotary drive mechanism 41 (rotating cylinder) can be used in conjunction with a positioner (not shown), the output end of the rotary drive mechanism 41 is connected to the input end of the positioner, and the output end of the positioner is connected to the rotating block 42. By providing a positioner, the rotary drive mechanism 41 can drive the ball of the ball valve 50 to accurately rotate a preset angle, which can improve the stability and accuracy of the structure.

[0041] like Figure 6 As shown, in some preferred embodiments, the rotating block 42 includes a connecting section 421, a limiting section 422 and a matching section 423 along its axial direction (i.e., vertical direction), wherein the overall shape of the rotating block 42 is a stepped shaft shape with a thick middle and small ends. The connecting section 421 located at the bottom is connected to the output end of the rotary drive mechanism 41, the upper end surface of the limiting section 422 is fitted and abutted against the lower surface of the workbench 10, and the limiting section 422 plays the role of axial limiting, and the matching section 423 is coaxially inserted upward into the center hole 10b of the workbench 10, and the upper end surface of the matching section 423 is provided with the locking hole 42a.

[0042] like Figure 6 As shown, in some preferred embodiments, a sleeve hole is coaxially provided on the lower end face of the connecting section 421, and the sleeve hole is coaxially sleeved on the output end of the rotation drive mechanism 41. In order to realize the connection between the connecting section 421 and the output end of the rotation drive mechanism 41, corresponding limiting holes (radial holes) are provided on the connecting section 421 and the output end of the rotation drive mechanism 41. The limiting screw 43 passes through the limiting hole of the connecting section 421 and is threadedly connected with the limiting hole on the output end, thereby making the connecting section 421 and the output end of the rotation drive mechanism 41 detachable. When the rotating block 42 needs to be replaced or the device needs to be maintained, the connection between the rotating block 42 and the rotation drive mechanism 41 can be released by simply removing the limiting screw 43.

[0043] One working mode of the airtightness detection device in this embodiment is as follows:

[0044] Step S1: Align the valve stem of the three-way ball valve 50 with the lock hole 42a of the rotating block 42 and then insert the valve stem downward into the lock hole 42a. At the same time, the positioning waist hole 51a on the connecting handle 51 of the three-way ball valve 50 is also aligned and sleeved on the positioning pin 111, so that the valve body of the ball valve 50 cannot rotate;

[0045] Step S2: The telescopic mechanism 21 of the third plug assembly 20c and the first plug assembly 20a drives the plug 22 to move toward the main valve port and the auxiliary valve port of the three-way ball valve 50, and the plug 22 fits against the end surface of the valve port to achieve blocking of the main valve port and the auxiliary valve port;

[0046] Step S3: The external vacuum equipment evacuates the interior of the ball valve 50 through the air pipe joint 30, and then the inert gas output pipe 60 purges the inert gas around the three-way ball valve 50, and then detects whether the vacuum equipment can suck out the inert gas from the ball valve 50, and then determines whether the air tightness of the ball valve 50 can meet the requirements.

[0047] Step S4: Then the telescopic mechanism 21 of the second plug assembly 20b drives the plug 22 to move toward another auxiliary valve port and close the auxiliary valve port;

[0048] Step S5: Then the rotating drive mechanism 41 drives the rotating block 42 to rotate, and the rotating block 42 drives the valve stem of the three-way ball valve 50 to rotate, so that the valve stem drives the ball inside the ball valve 50 to rotate a certain angle (for example, 45 degrees or other degrees), and then continue to evacuate and purge the inert gas, so as to determine whether the air tightness of the ball valve in the current state meets the requirements. The ball valve 50 rotates angles multiple times according to this step, and finally realizes the detection of the ball valve at multiple angles;

[0049] Step S6: After the ball valve 50 completes multiple angle tests according to actual needs, each plug assembly 20 retracts, the ball valve 50 is removed, and the test is completed.

[0050] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application.

Claims

1. An air tightness detection device for a three-way ball valve, characterized in that: It comprises a workbench (10), a plug assembly (20), a gas pipe joint (30), an angle drive assembly (40) and an inert gas output pipe (60); The workbench (10) is arranged on a work surface, and a positioning mechanism (11) for fixing the three-way ball valve (50) is arranged on the workbench (10); The three plug assemblies (20) are respectively arranged in one-to-one correspondence with the three valve ports (52) of the three-way ball valve (50); the plug assembly (20) comprises a telescopic mechanism (21) and a plug (22); the telescopic mechanism (21) is arranged on a workbench (10); the plug (22) is connected to a telescopic end (21a) of the telescopic mechanism (21); the plug (22) is driven by the telescopic mechanism (21) to block the valve port (52) of the three-way ball valve (50); The air pipe joint (30) is arranged on any one of the plugs (22), and one end of the air pipe joint (30) is used to communicate with the inside of the three-way ball valve (50), and the other end is communicated with an external vacuum device; The angle driving assembly (40) comprises a rotary driving mechanism (41) and a rotating block (42); the rotary driving mechanism (41) is installed on the workbench (10), the rotating block (42) is connected to the output end of the rotary driving mechanism (41), and the rotary block (42) is driven to rotate by the rotary driving mechanism (41); a locking hole (42a) is provided on the rotating block (42), and the valve stem of the three-way ball valve (50) is inserted into the locking hole (42a); The inert gas output pipe (60) is arranged on the workbench (10) and is used for spraying the inert gas toward the three-way ball valve (50) on the workbench (10).

2. The airtightness detection device according to claim 1, characterized in that: The positioning mechanism (11) comprises a plurality of positioning pins (111) arranged on a workbench (10); a positioning waist hole (51a) is arranged on the connecting handle (51) of the three-way ball valve (50); and the positioning pins (111) pass through the positioning waist hole (51a).

3. The airtightness detection device according to claim 2, characterized in that: The workbench (10) is provided with a plurality of mounting holes (10a), and the positioning pins (111) are threadedly connected in the mounting holes (10a).

4. The airtightness detection device according to claim 1, characterized in that: The workbench (10) is provided with a gantry (12), and three plug assemblies (20) are respectively arranged on three sides of the gantry (12).

5. The airtightness detection device according to claim 1, characterized in that: An annular sealing groove (22a) is provided on the side of the plug (22) facing the three-way ball valve (50), at least a portion of the sealing ring (22b) is provided in the annular sealing groove (22a), and the sealing ring (22b) can abut against the valve port end face (52a) of the three-way ball valve (50).

6. The airtightness detection device according to any one of claims 1 to 5, characterized in that: The plug (22) is detachably connected to the telescopic end (21a) of the telescopic mechanism (21).

7. The airtightness detection device according to claim 6, characterized in that: The telescopic mechanism (21) is configured as a telescopic cylinder or an electric push rod.

8. The airtightness detection device according to claim 1, characterized in that: The rotating block (42) includes a connecting section (421), a limiting section (422) and a matching section (423) along its axial direction; the connecting section (421) is connected to the output end of the rotating drive mechanism (41), and the upper end surface of the limiting section (422) is abutted against the lower surface of the workbench (10); the matching section (423) is inserted into the central hole (10b) of the workbench (10), and the upper surface of the matching section (423) is provided with the locking hole (42a), and the inner peripheral contour of the locking hole (42a) is consistent with the outer peripheral contour of the valve stem.

9. The airtightness detection device according to claim 8, characterized in that: The connecting section (421) is provided with a sleeve hole, and the sleeve hole is coaxially sleeved on the output end of the rotary drive mechanism (41), and the connecting section (421) and the output end of the rotary drive mechanism (41) are both provided with corresponding limiting holes, and the limiting screw (43) is connected in the limiting hole to achieve the fixation between the connecting section (421) and the rotary drive mechanism (41).

10. The airtightness detection device according to claim 8 or 9, characterized in that: The rotary drive mechanism (41) is configured as a rotary cylinder.

Images