An ultrasonic gas meter built-in valve air tightness detection device

Abstract

The present application relates to the technical field of air tightness detection, and provides an ultrasonic gas meter built-in valve air tightness detection device, including a mounting frame, a positioning seat, a pressure nozzle, a lifting assembly, and a gas supply detection assembly. The positioning seat is installed at the bottom of the mounting frame and is provided in plurality, and the top of each positioning seat has a convex portion for embedding into the shell; the pressure nozzle is slidably installed on the mounting frame and is provided in plurality, and the plurality of pressure nozzles are arranged corresponding to the plurality of positioning seats. When the shell is placed on the positioning seat and the convex portion is embedded in the shell, the pressure nozzle is directly opposite to the air inlet end of the shell on the corresponding positioning seat; the lifting assembly is arranged on the mounting frame to drive all the pressure nozzles to rise and fall synchronously, and the gas supply detection assembly is arranged on the pressure nozzle to fill the air inlet end of the shell with gas and detect the air pressure. The ultrasonic gas meter built-in valve air tightness detection device of the present application can improve the detection efficiency and detection accuracy of the air tightness of the valve body.

Description

Technical Field

[0001] The present application relates to the technical field of air tightness detection, and in particular to an air tightness detection device for a built-in valve of an ultrasonic gas meter. Background Art

[0002] With the acceleration of urbanization, natural gas is increasingly used as a clean energy source, and the requirements for gas metering equipment are becoming higher and higher. Ultrasonic gas meters are increasingly in demand in the market due to their high accuracy, long life, and strong adaptability. In order to ensure the safety and reliability of ultrasonic gas meters, it is particularly important to detect the air tightness of their internal components, especially the built-in valves.

[0003] Reference Figure 1 The built-in valve of the ultrasonic gas meter (hereinafter referred to as the valve body 53) is installed in the shell 5. The surface of the shell 5 is provided with an air inlet terminal 51, and the air inlet terminal 51 is connected with the input end of the valve body 53. During the air tightness test, a certain pressure of gas is introduced into the valve body 53 through the air inlet terminal 51 and maintained for a set time, and the air tightness of the valve body 53 is judged to be qualified according to the loss of air pressure.

[0004] However, most of the existing inspections on valve body air tightness are still at the manual inspection stage, which is inefficient and easily affected by human factors, reducing the inspection accuracy of valve body air tightness. Therefore, there is an urgent need for a detection equipment with high detection efficiency and high detection accuracy. Summary of the invention

[0005] In order to improve the detection efficiency and accuracy of valve body air tightness, the present application provides an ultrasonic gas meter built-in valve air tightness detection device.

[0006] The ultrasonic gas meter built-in valve air tightness detection device provided in this application adopts the following technical solution:

[0007] An ultrasonic gas meter built-in valve air tightness detection device comprises a mounting frame, a positioning seat, a pressure nozzle, a lifting assembly and a gas supply detection assembly, wherein the positioning seat is mounted on the bottom of the mounting frame and is provided in plurality, and the top of each positioning seat has a convex portion for embedding into a shell; the pressure nozzle is slidably mounted on the mounting frame and is provided in plurality, and the plurality of pressure nozzles are correspondingly arranged with the plurality of positioning seats, and when the shell is placed on the positioning seat and the convex portion is embedded in the shell, the pressure nozzle is directly opposite to the air inlet end of the shell on the corresponding positioning seat; the lifting assembly is arranged on the mounting frame to drive all the pressure nozzles to rise and fall synchronously, and the gas supply detection assembly is arranged on the pressure nozzle to fill the air inlet end of the shell with gas and detect the air pressure.

[0008] By adopting the above-mentioned technical scheme, the shell is placed on the convex part of the positioning seat through the arrangement of the positioning seat, the pressure nozzle, the lifting assembly and the air supply detection assembly. The convex part can position the shell so that the pressure nozzle is directly opposite to the air inlet end of the shell on the positioning seat. Then, the pressure nozzle is driven downward by the lifting assembly to make the pressure nozzle dock with the air inlet end. Then, in conjunction with the air supply detection assembly, the air tightness test of the valve body in the shell can be performed. The cooperation between the pressure nozzle and the convex part reduces the manual participation in the detection process and reduces the influence of human factors. By arranging multiple positioning seats and multiple pressure nozzles, it is possible to perform air tightness tests on multiple valve bodies at the same time, which greatly improves the detection efficiency and detection accuracy of the air tightness of the valve bodies.

[0009] Optionally, the air supply detection assembly includes an air source pipe, an inflation pipe and a U-tube manometer, and the air source pipe is provided with a pressure regulating valve and a set valuer in sequence along the air supply direction; the number of the inflation pipes is arranged corresponding to the number of the pressure nozzles, one end of each of the inflation pipes is connected to the air source pipe, and the other end is connected to the interior of the corresponding pressure nozzle, and the U-tube manometer is connected to the inflation pipe for detecting the air pressure.

[0010] By adopting the above-mentioned technical scheme, through the setting of the air source pipe, the inflation pipe and the U-tube pressure gauge, after the pressure nozzle is connected to the air inlet end, a certain pressure of gas is introduced into the valve body through the air source pipe, and the pressure is maintained for a certain period of time. The U-tube pressure gauge can detect the loss of air pressure and then determine whether the air tightness of the valve body is qualified.

[0011] Optionally, the top wall of the convex portion is provided with an installation groove, and the two opposite side walls of the convex portion are provided with rotating arc grooves connected to the installation groove, and a rotating arc rod is arranged in each rotating arc groove, and the rotating arc rod is installed in the rotating arc groove and can rotate around the virtual center axis of the rotating arc groove; the rotating arc rod forms a first positioning surface at the end away from the installation groove, and the outer wall of the convex portion has a second positioning surface, and the second positioning surface and the first positioning surfaces of the two rotating arc rods are arranged in a triangle for abutting against different inner walls of the shell; the convex portion is provided with a driving assembly, and the driving assembly is used to drive the first positioning surfaces of the two rotating arc rods to synchronously rotate out of the rotating arc groove or synchronously rotate into the rotating arc groove.

[0012] By adopting the above-mentioned technical scheme and setting the rotating arc rod, under normal conditions, the first positioning surfaces of the two rotating arc rods are rotated into the rotating arc groove to facilitate the placement of the shell; during inspection, the shell is placed on the positioning seat so that the convex portion is embedded in the shell and the second positioning surface abuts against the inner wall of the shell, and then the two rotating arc rods are driven to rotate synchronously through the driving assembly to drive the first positioning surfaces of the two rotating arc rods to rotate out of the rotating arc groove synchronously, and the second positioning surface and the first positioning surfaces of the two rotating arc rods are arranged in a triangle and abut against different inner walls of the shell, so as to quickly position the shell and align the air inlet end with the pressure nozzle, thereby improving the positioning accuracy.

[0013] Optionally, the driving assembly includes a sliding bar, a first pushing block, a second pushing block and a driving member, the sliding bar is slidably installed in the installation groove, the first pushing block and the second pushing block are both installed on the sliding bar, a pushing gap is formed between the first pushing block and the second pushing block, and one end of each rotating arc rod away from the first positioning surface extends into the pushing gap; the driving member is arranged between the sliding bar and the mounting frame, when the pressing nozzle is pressed down, the driving member drives the sliding bar to slide, and forces the first positioning surface of the rotating arc rod to rotate out of the rotating arc groove through the first pushing block; when the pressing nozzle is lifted, the driving member drives the sliding bar to slide in the opposite direction, and forces the first positioning surface of the rotating arc rod to rotate into the rotating arc groove through the second pushing block.

[0014] By adopting the above-mentioned technical scheme, through the setting of the sliding bar, the first pushing block, the second pushing block and the driving member, when the pressure nozzle is pressed down, the driving member drives the sliding bar to move, and simultaneously pushes the two rotating arc rods through the first pushing block, so that the first positioning surface of the rotating arc rod rotates out of the rotating arc groove and abuts against the inner wall of the shell, thereby correcting the positioning of the shell to facilitate the docking between the pressure nozzle and the air inlet end; after the detection is completed, the pressure nozzle is driven to rise, and at this time the driving member drives the sliding bar to move in the opposite direction, thereby pushing the two rotating arc rods under the action of the second pushing block, forcing the first positioning surface of the rotating arc rod to rotate into the rotating arc groove, so as to facilitate the removal of the shell after the detection and the placement of the next shell, which greatly improves the convenience of the shell positioning operation.

[0015] Optionally, the pressing nozzle has a docking groove for inserting an air inlet end head, a sealing sleeve is installed in the docking groove, and the sealing sleeve is elastically arranged to tighten the outer peripheral wall of the air inlet end head; the outer peripheral wall of the sealing sleeve is provided with a plurality of tightening strips, and the plurality of tightening strips are arranged at intervals around the outer peripheral wall of the sealing sleeve, each of the tightening strips is slidably installed in the docking groove and can be displaced radially along the pressing nozzle; the pressing nozzle is provided with a clamping assembly, and when the air inlet end head is inserted into the docking groove, the clamping assembly drives the tightening strip to displace toward the center of the docking groove.

[0016] By adopting the above-mentioned technical scheme, through the setting of the sealing sleeve, the tightening strip and the clamping component, the pressure nozzle is pressed down to force the air inlet end to be inserted into the docking groove. Under the action of the clamping component, multiple tightening strips are displaced toward the center of the docking groove to drive the elastically arranged sealing sleeve to clamp the outer peripheral wall of the air inlet end, thereby improving the air tightness between the pressure nozzle and the air inlet end, and then improving the detection accuracy of the air tightness of the valve body.

[0017] Optionally, the inner wall of the docking groove is provided with a plurality of movable grooves, and the plurality of movable grooves are arranged corresponding to the plurality of tightening strips, each of the tightening strips is slidably installed in the corresponding movable groove and can be displaced radially along the pressing nozzle; a return spring is provided between the tightening strip and the inner wall of the movable groove, and the return spring normally causes the tightening strip to move away from the center of the docking groove; the clamping assembly includes a first abutment ring, a first connecting column and a first abutment block, the first abutment ring is slidably installed at the bottom of the pressing nozzle, the lower end surface of the tightening strip is provided with a first plug-in groove, the first plug-in groove has a first guide surface, one end of the first connecting column is connected to the first abutment ring, and the other end is inserted into the first plug-in groove and connected to the first abutment block; a reinforcing ring for the first abutment ring to abut is installed at the connection between the air intake end and the shell, and when the air intake end is inserted into the docking groove, the first abutment ring drives the first abutment block to lift, and drives the tightening strip to move toward the center of the docking groove through the first guide surface.

[0018] By adopting the above-mentioned technical scheme, through the arrangement of the first abutment ring, the first connecting column and the first abutment block, under normal conditions (when the pressure nozzle is lifted), the tightening strip is displaced toward the center of the docking groove under the action of the return spring to expand the sealing sleeve for the insertion of the air intake end head; in the process of the pressure nozzle pressing down to force the air intake end head to be inserted into the docking groove, the first abutment ring abuts against the reinforcing ring and then stops moving downward, so that the first abutment block can be lifted relative to the pressure nozzle, and the tightening strip is driven to move toward the center of the docking groove through the first guide surface, so that the sealing sleeve can tighten the outer peripheral wall of the air intake end head, thereby improving the air tightness between the pressure nozzle and the air intake end head, and improving the operational convenience of the overall structure.

[0019] Optionally, a rotating plate is rotatably mounted on the top wall of the docking groove, a second abutment block is provided on the bottom wall of the rotating plate, a second insertion groove is provided on the upper end face of the tightening strip, and the second insertion groove has a second guide surface; the pressing nozzle is provided with a rotating component, and when the air inlet end is inserted into the docking groove, the rotating component forces the rotating plate to rotate, so that the second abutment block is transferred into the second insertion groove and the tightening strip is driven toward the center of the docking groove through the second guide surface.

[0020] By adopting the above-mentioned technical scheme, through the arrangement of the rotating plate, the second abutment block and the rotating assembly, during the pressing process of the pressing nozzle, the tightening strip is displaced toward the center of the docking groove under the action of the clamping assembly. At the same time, the rotating assembly can drive the rotating plate to rotate around its own central axis, forcing the second abutment block to rotate into the second plug-in groove and drive the tightening strip to displace toward the center of the docking groove through the second guide surface. The cooperation between the rotating plate and the clamping assembly greatly improves the pushing effect of the tightening strip, thereby improving the clamping effect of the sealing sleeve on the air inlet end, and further improving the air tightness between the pressing nozzle and the air inlet end.

[0021] Optionally, the rotating assembly includes a second abutment ring, a second connecting column and an inclined rod, the second abutment ring is slidably installed on the bottom of the pressure nozzle for abutting the surface of the shell, a third plug-in groove is opened on the surface of the rotating plate, one end of the second connecting column is connected to the second abutment ring, and the other end is inserted into the pressure nozzle, one end of the inclined rod is connected to the second connecting column, and the other end passes through the third plug-in groove, when the air intake end is inserted into the docking groove, the second abutment ring drives the inclined rod to lift, and forces the second abutment block of the rotating plate to rotate into the second plug-in groove through the third plug-in groove.

[0022] By adopting the above-mentioned technical scheme, through the arrangement of the second abutment ring, the second connecting column and the inclined rod, when the pressure nozzle presses down to force the air inlet end to be inserted into the docking groove, the second abutment ring abuts against the shell surface and then stops moving downward, so that the inclined rod can be lifted relative to the pressure nozzle, and the rotating plate is driven to rotate through the third plug-in groove, so that the second abutment block is transferred into the second plug-in groove and the tightening strip is driven to move toward the center of the docking groove through the second guide surface, so that the upper part of the sealing sleeve can tighten the outer peripheral wall of the air inlet end, thereby improving the operational convenience of the overall structure.

[0023] Optionally, an inflation chamber is provided in the pressing nozzle, the inflation chamber is located at the top of the docking groove, and the end of the inflation tube away from the air source tube is connected to the inflation chamber; a first air vent connected to the docking groove is provided on the bottom wall of the inflation chamber, and a second air vent connected to the first air vent is provided on the surface of the rotating plate; a third air vent is provided on the bottom wall of the inflation chamber, and a fourth air vent is provided on the surface of the rotating plate, an air bag is provided between two adjacent tightening strips, and a mounting plate is provided on the top wall of the air bag, and a fifth air vent connected to the inside of the air bag is provided on the surface of the mounting plate; when the air inlet end is inserted into the docking groove and forces the second abutment block of the rotating plate to abut against the second guide surface, the third air vent, the fourth air vent and the fifth air vent are connected to each other.

[0024] By adopting the above-mentioned technical solution and setting the inflatable bag, after the air inlet end completely enters the docking groove, the third air vent, the fourth air vent and the fifth air vent are interconnected, and part of the gas in the inflation cavity enters the inflatable bag through the third air vent, the fourth air vent and the fifth air vent in sequence, causing the inflatable bag to expand and press against the outer wall of the sealing sleeve, thereby improving the clamping effect of the sealing sleeve on the outer wall of the air inlet end, thereby improving the air tightness between the pressure nozzle and the air inlet end, and improving the detection accuracy of the air tightness of the valve body.

[0025] Optionally, a plurality of guide blades are installed in the second air vent, and the plurality of guide blades are arranged at intervals around the central axis of the rotating plate, and a ventilation flow channel for gas to pass through is formed between two adjacent guide blades; the ventilation flow channel is arranged at an angle, and when the air inlet end is inserted into the docking groove and inflated, the air flow passes through the guide blades to form a driving force on the rotating plate, forcing the second abutment block to press against the second guide surface.

[0026] By adopting the above-mentioned technical solution and setting the guide vanes, when the air inlet end enters the docking groove and is inflated, the gas in the inflation chamber enters the valve body through the first air vent, the second air vent and the air inlet end in sequence. When the gas passes through the second air vent, it can act on the rotating plate through the guide vanes, forcing the rotating plate to have a driving force for rotation. This driving force can improve the tightening effect of the second abutment block on the tightening strip, thereby improving the tightening effect of the sealing sleeve on the air inlet end.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Through the arrangement of the positioning seat, the pressure nozzle, the lifting assembly and the air supply detection assembly, the shell is placed on the convex part of the positioning seat. The convex part can position the shell so that the pressure nozzle is directly opposite to the air inlet end of the shell on the positioning seat. Then, the pressure nozzle is driven down by the lifting assembly so that the pressure nozzle is butted against the air inlet end. Then, in conjunction with the air supply detection assembly, the air tightness detection of the valve body in the shell can be performed. The cooperation of the pressure nozzle and the convex part reduces the manual participation in the detection process and reduces the influence of human factors. By arranging multiple positioning seats and multiple pressure nozzles, multiple valve bodies can be tested for air tightness at the same time, which greatly improves the detection efficiency and detection accuracy of the air tightness of the valve body.

[0029] 2. Through the arrangement of the sliding bar, the first pushing block, the second pushing block and the driving member, when the pressure nozzle is pressed down, the driving member drives the sliding bar to move, and simultaneously pushes the two rotating arc rods through the first pushing block, so that the first positioning surface of the rotating arc rod rotates out of the rotating arc groove and abuts against the inner wall of the shell, thereby correcting the deviation and positioning of the shell, so as to facilitate the docking between the pressure nozzle and the air inlet end; after the detection is completed, the pressure nozzle is driven to be lifted, and at this time, the driving member drives the sliding bar to move in the opposite direction, so that the two rotating arc rods are pushed under the action of the second pushing block, forcing the first positioning surface of the rotating arc rod to rotate into the rotating arc groove, so as to facilitate the removal of the shell after the detection and the placement of the next shell, which greatly improves the convenience of the shell positioning operation;

[0030] 3. Through the arrangement of the rotating plate, the second abutment block and the rotating assembly, during the pressing process of the pressing nozzle, the tightening strip is displaced toward the center of the docking groove under the action of the clamping assembly. At the same time, the rotating assembly can drive the rotating plate to rotate around its own central axis, forcing the second abutment block to rotate into the second plug-in groove and drive the tightening strip to displace toward the center of the docking groove through the second guide surface. The cooperation of the rotating plate and the clamping assembly greatly improves the pushing effect of the tightening strip, thereby improving the clamping effect of the sealing sleeve on the air inlet end, and further improving the air tightness between the pressing nozzle and the air inlet end. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a valve body and a housing in the background technology;

[0032] Figure 2 is a schematic diagram of the overall structure of Example 1;

[0033] Figure 3 This is a schematic diagram of the structure of the lifting assembly embodied in Example 1;

[0034] Figure 4 This is a schematic diagram of the structure of the positioning seat embodied in Example 1;

[0035] Figure 5 is a schematic diagram of the structure of the drive assembly embodied in Example 2;

[0036] Figure 6 is a partial cross-sectional view of a rotating arc rod embodying embodiment 2;

[0037] Figure 7 is a partial cross-sectional view of the clamping assembly of embodiment 3;

[0038] Figure 8 is a partial cross-sectional view of a tightening strip according to Embodiment 3;

[0039] Fig. 9 yes Figure 7 The enlarged view of point A in the middle;

[0040] Fig.10 is a partial cross-sectional view of a rotating plate according to Embodiment 4;

[0041] Fig.11 is a partial cross-sectional view of the second guide surface of embodiment 4;

[0042] Fig.12 is a partial cross-sectional view of a rotating assembly according to Embodiment 4;

[0043] Fig.13 This is a schematic diagram of the structure of the inclined rod in Example 4;

[0044] Fig.14 is a partial cross-sectional view of an inflatable bag according to Embodiment 5;

[0045] Fig.15 yes Fig.14 The enlarged view of point B in the middle;

[0046] Fig.16 It is a schematic diagram of the structure of the guide vane according to Example 6.

[0047] Description of reference numerals: 1, mounting frame; 11, positioning seat; 111, convex portion; 1111, second positioning surface; 112, mounting groove; 113, rotating arc groove; 114, rotating arc rod; 1141, first positioning surface; 1142, reset block; 12, pressure nozzle; 121, docking groove; 122, moving groove; 123, reset spring; 124, inflation cavity; 125, first vent; 126, third vent; 127, expansion slot; 128, avoidance slot; 129, embedded slot; 13, lifting assembly; 131, pressure plate; 132, cylinder; 133, guide rod; 14, air supply detection assembly; 141, air source pipe; 142, inflation pipe; 143, U-tube pressure gauge; 144, pressure regulating valve; 145, set value; 2, drive assembly; 21, slide bar; 22, first push block; 23, second push block 1. first plug-in slot; 2. second plug-in slot; 3. second plug-in slot; 4. first plug-in slot; 5. second plug-in slot; 6. first plug-in slot; 7. second plug-in slot; 8. first plug-in slot; 9. second plug-in slot; 10. first plug-in slot; 11. second plug-in slot; 12. first plug-in slot; 13. first plug-in slot; 14. second plug-in slot; 15. first plug-in slot; 16. first plug-in slot; 17. first plug-in slot; 18. first plug-in slot; 19. second plug-in slot; 20. first plug-in slot; 21. first plug-in slot; 22. first plug-in slot; 23. first plug-in slot; 24. second plug-in slot; 25. pressure rod; 26. drive strip; 261. guide surface; 27. compression spring; 3. sealing sleeve; 31. tightening strip; 311. first plug-in slot; 312. first guide surface; 313. second plug-in slot; 314. second guide surface; 4. clamping assembly; 41. first abutment ring; 42. first connecting column; 43. first abutment block; 5. shell; 51. air inlet end; 52. reinforcement ring; 53. valve body; 6. rotating plate; 61. second abutment block; 62. third plug-in slot; 63. second vent; 64. fourth vent; 65. guide vane; 651. ventilation flow channel; 66. through hole; 67. guide block; 7. rotating assembly; 71. second abutment ring; 72. second connecting column; 73. inclined rod; 8. inflatable bag; 81. mounting plate; 811. fifth vent. DETAILED DESCRIPTION

[0048] The following is combined with Figure 2 -Attached Fig.16 This application is described in further detail.

[0049] Example 1

[0050] The embodiment of the present application discloses an ultrasonic gas meter built-in valve air tightness detection device.

[0051] Reference Figure 2 , Figure 3 , Figure 4, an ultrasonic gas meter built-in valve air tightness detection device, including a mounting frame 1, a positioning seat 11, a pressure nozzle 12, a lifting assembly 13 and a gas supply detection assembly 14, the positioning seat 11 is installed at the bottom of the mounting frame 1 and is provided with multiple, in this embodiment, the top wall of each positioning seat 11 is integrally formed with a convex portion 111, the convex portion 111 is used to be embedded in a shell body 5, and the side wall of the convex portion 111 is used to abut the inner wall of the shell body 5, when the shell body 5 is placed on the positioning seat 11 and the convex portion 111 is embedded in the shell body 5, the air inlet end 51 of the shell body 5 is arranged upward.

[0052] Reference Figure 2 , Figure 3 , a pressure nozzle 12 is slidably installed on the mounting frame 1 and is provided with a plurality of pressure nozzles 12, and the plurality of pressure nozzles 12 are correspondingly arranged with the plurality of positioning seats 11, and each pressure nozzle 12 is located above the corresponding positioning seat 11. When the shell 5 is placed on the positioning seat 11 and the protrusion 111 is embedded in the shell 5, the pressure nozzle 12 is directly opposite to the air inlet head 51 of the shell 5 on the corresponding positioning seat 11; in this embodiment, the pressure nozzle 12 is a cylindrical structure, and the lower end surface of the pressure nozzle 12 is provided with a docking groove 121 for inserting the air inlet head 51, and the inner wall of the docking groove 121 is embedded with a sealing ring (not shown in the figure), and when the air inlet head 51 is inserted into the docking groove 121, the sealing ring abuts against the outer peripheral wall of the air inlet head 51.

[0053] The lifting assembly 13 is arranged on the mounting frame 1 to drive all the pressure nozzles 12 to lift and lower synchronously. In this embodiment, the lifting assembly 13 includes a pressure plate 131 and a cylinder 132. The plate surface of the pressure plate 131 is arranged horizontally. A guide rod 133 is fixedly installed on the upper surface of the pressure plate 131. The guide rod 133 is slidably penetrated through the mounting frame 1, and the pressure plate 131 is slidably installed on the mounting frame 1 through the guide rod 133; multiple pressure nozzles 12 are fixedly installed on the lower surface of the pressure plate 131, and the pressure nozzles 12 and the pressure plate 131 can be detachably connected by bolt connection; the cylinder body of the cylinder 132 is fixedly installed on the mounting frame 1, and the piston rod of the cylinder 132 passes through the mounting frame 1 and is fixedly connected to the pressure plate 131.

[0054] Reference Figure 2, the air supply detection component 14 is arranged on the pressure nozzle 12 to fill the air into the air inlet end 51 of the shell 5 and detect the air pressure. The air supply detection component 14 includes an air source pipe 141, an air charging pipe 142 and a U-tube pressure gauge 143. One end of the air source pipe 141 is used for external air supply equipment (not shown in the figure), and the air source pipe 141 is sequentially installed with a pressure regulating valve 144 and a set valuer 145 along the air supply direction; the air charging pipe 142 is a hose, and the number of the air charging pipes 142 is arranged corresponding to the number of the pressure nozzles 12. One end of each air charging pipe 142 is connected to the air source pipe 141, and the other end is connected to the corresponding pressure nozzle 12 and connected to the docking groove 121 of the pressure nozzle 12; the U-tube pressure gauge 143 (the U-tube pressure gauge 143 is a prior art, and its structure is not described in detail here, and its structural features are not specifically expanded in the figure) is connected to the air charging pipe 142 to detect the air pressure loss condition of the air charging pipe 142.

[0055] The implementation principle of Example 1 of the present application is: the shell 5 is placed on the protrusion 111 of the positioning seat 11, and the protrusion 111 can position the shell 5 so that the pressure nozzle 12 is directly opposite to the air inlet end 51 of the shell 5 on the positioning seat 11, and then the pressure nozzle 12 is driven down by the lifting component 13 to make the pressure nozzle 12 dock with the air inlet end 51, and then cooperate with the air supply detection component 14 to perform an air tightness test on the valve body 53 in the shell 5; the cooperation between the pressure nozzle 12 and the protrusion 111 reduces the manual participation in the detection process and reduces the influence of human factors; by setting multiple positioning seats 11 and multiple pressure nozzles 12, it is possible to perform air tightness tests on multiple valve bodies 53 at the same time, which greatly improves the detection efficiency and detection accuracy of the air tightness of the valve body 53.

[0056] Example 2

[0057] The embodiment of the present application discloses an ultrasonic gas meter built-in valve air tightness detection device.

[0058] Reference Figure 5 , Figure 6 The difference between the ultrasonic gas meter built-in valve air tightness detection device disclosed in the embodiment of the present application and the embodiment 1 is that:

[0059] In this embodiment, the top wall of the convex portion 111 is provided with a mounting groove 112, and the two opposite side walls of the convex portion 111 are provided with a rotating arc groove 113, the rotating arc groove 113 is connected to the mounting groove 112, and the rotating arc groove 113 is arc-shaped, and each rotating arc groove 113 is provided with a rotating arc rod 114, and the rotating arc rod 114 is installed in the rotating arc groove 113 and can rotate around the virtual central axis of the rotating arc groove 113; the end of the rotating arc rod 114 away from the mounting groove 112 forms a first positioning Surface 1141, the outer wall of the protrusion 111 has a second positioning surface 1111, and the second positioning surface 1111 and the first positioning surfaces 1141 of the two rotating arc rods 114 are arranged in a triangle for abutting against different inner walls of the shell 5; it should be noted that when the first positioning surface 1141 abuts against the inner wall of the shell 5, the rotating arc rod 114 has a thrust force on the shell 5, and this thrust force is used to force the inner wall of the shell 5 to press against the second positioning surface 1111 of the protrusion 111 to form a three-point positioning.

[0060] Reference Figure 5 , Figure 6 The convex portion 111 is provided with a driving assembly 2, and the driving assembly 2 is used to drive the first positioning surfaces 1141 of the two rotating arc rods 114 to synchronously rotate out of the rotating arc groove 113 or synchronously rotate into the rotating arc groove 113; the driving assembly 2 includes a sliding bar 21, a first pushing block 22, a second pushing block 23 and a driving member, the sliding bar 21 is slidably installed in the installation groove 112 and can approach or move away from the second positioning surface 1111; the first pushing block 22 and the second pushing block 23 are both fixedly installed on the upper surface of the sliding bar 21, the first pushing block 22 is located on the side of the second pushing block 23 away from the second positioning surface 1111, the first pushing block 22 and the second pushing block 23 are spaced and form a pushing gap 24, and the ends of the two rotating arc rods 114 away from the first positioning surface 1141 both extend into the pushing gap 24; the rotating arc rod 114 is installed with a reset block 1142, the reset block 1142 is located in the pushing gap 24, and the reset block 1142 is used for the second pushing block 23 to abut.

[0061] Reference Figure 5 , Figure 6 The driving member is arranged between the sliding bar 21 and the mounting frame 1. When the pressing nozzle 12 is pressed down, the driving member drives the sliding bar 21 to slide toward the second positioning surface 1111, and pushes the rotating arc rod 114 through the first pushing block 22 to force the first positioning surface 1141 of the rotating arc rod 114 to rotate out of the rotating arc groove 113 and abut against the inner wall of the shell 5; when the pressing nozzle 12 is lifted, the driving member drives the sliding bar 21 to slide in the opposite direction (that is, forces the sliding bar 21 to move away from the second positioning surface 1111), and pushes the reset block 1142 of the rotating arc rod 114 through the second pushing block 23 to force the first positioning surface 1141 of the rotating arc rod 114 to rotate into the rotating arc groove 113.

[0062] Reference Figure 5 , Figure 6 The driving member includes a pressure rod 25, a driving bar 26 and a compression spring 27. The pressure rod 25 is vertically arranged, and a pressure plate 131 is fixedly installed on the upper end of the pressure rod 25. One end of the driving bar 26 is fixedly connected to the bottom wall of the sliding bar 21, and the other end passes through the positioning seat 11. The end of the driving bar 26 away from the positioning seat 11 has a guide surface 261. When the pressure plate 131 is pressed down, the pressure rod 25 drives the driving bar 26 to move through the guide surface 261, and drives the sliding bar 21 to move toward the second positioning surface 1111; one end of the compression spring 27 is fixedly connected to the inner wall of the mounting groove 112, and the other end is fixedly connected to the sliding bar 21. The compression spring 27 normally forces the sliding bar 21 to move away from the second positioning surface 1111, so that the second pushing block 23 forces the first positioning surface 1141 of the rotating arc rod 114 to rotate into the rotating arc groove 113.

[0063] The implementation principle of Example 2 of the present application is as follows: under normal conditions (the pressure plate 131 is in the lifted state), the compression spring 27 forces the first positioning surfaces 1141 of the two rotating arc rods 114 to rotate into the rotating arc groove 113 to facilitate the placement of the shell 5; during detection, the shell 5 is placed on the positioning seat 11, so that the protrusion 111 is embedded in the shell 5 and the second positioning surface 1111 abuts against the inner wall of the shell 5; then the pressure plate 131 is driven to move downward, and during the downward movement of the pressure plate 131, the sliding bar 21 is driven to move toward the side close to the second positioning surface 1111 through the cooperation of the pressure rod 25 and the driving bar 26, so that the first pushing block 22 simultaneously pushes the two rotating arc rods 114, so that the first positioning surface 1141 of the rotating arc rod 114 rotates out of the rotating arc groove 113 and abuts against the inner wall of the shell 5, thereby correcting the deviation and positioning of the shell 5 to facilitate the docking between the pressure nozzle 12 and the air inlet end 51.

[0064] After the detection is completed, the pressing nozzle 12 is driven to rise, and the first positioning surfaces 1141 of the two rotating arc rods 114 automatically rotate into the rotating arc groove 113, so as to facilitate the removal of the shell 5 after the detection and the placement of the next shell 5, which greatly improves the convenience of the positioning operation of the shell 5.

[0065] Example 3

[0066] The embodiment of the present application discloses an ultrasonic gas meter built-in valve air tightness detection device.

[0067] Reference Figure 7 , Figure 8 The difference between the ultrasonic gas meter built-in valve air tightness detection device disclosed in the embodiment of the present application and the embodiment 1 is that:

[0068] In this embodiment, a sealing sleeve 3 is installed in the docking groove 121, and the sealing sleeve 3 and the pressure nozzle 12 are coaxially arranged. The sealing sleeve 3 is a rubber sleeve used to tighten the outer peripheral wall of the air inlet end head 51, and a plurality of tightening strips 31 are fixedly installed on the outer peripheral wall of the sealing sleeve 3. The plurality of tightening strips 31 are arranged at intervals around the outer peripheral wall of the sealing sleeve 3, and both ends of each tightening strip 31 are extended along the height direction; a plurality of movable grooves 122 are opened on the inner wall of the docking groove 121, and the plurality of movable grooves 122 are arranged corresponding to the plurality of tightening strips 31, and each of the tightening strips 31 is slidably installed in the corresponding movable groove 122 and can be displaced radially along the pressure nozzle 12.

[0069] A return spring 123 is installed between the tightening strip 31 and the inner wall of the movable groove 122. One end of the return spring 123 is fixedly connected to the inner wall of the movable groove 122, and the other end is fixedly connected to the tightening strip 31. The return spring 123 normally causes the tightening strip 31 to move away from the center of the docking groove 121 to expand the sealing sleeve 3 to facilitate the insertion of the air inlet end 51.

[0070] Reference Figure 7 , Fig. 9 The pressing nozzle 12 is provided with a clamping assembly 4. When the air inlet end 51 is inserted into the docking groove 121, the clamping assembly 4 drives the tightening strip 31 to move toward the center of the docking groove 121. In this embodiment, the clamping assembly 4 includes a first abutment ring 41, a first connecting column 42 and a first abutment block 43. The first abutment ring 41 is annular and is coaxially arranged with the pressing nozzle 12. The first abutment ring 41 is slidably installed at the bottom of the pressing nozzle 12.

[0071] A first plug-in slot 311 is provided on the lower end face of each tightening strip 31, and the first plug-in slot 311 has a first guide surface 312. The number of first connecting columns 42 is arranged corresponding to the number of tightening strips 31. One end of the first connecting column 42 is fixedly connected to the first abutment ring 41, and the other end is inserted into the first plug-in slot 311 and fixedly connected to the first abutment block 43. A reinforcement ring 52 for abutting the first abutment ring 41 is integrally formed at the connection between the air intake end head 51 and the shell 5 (the reinforcement ring 52 is arranged to improve the connection strength between the air intake end head 51 and the shell 5). When the air intake end head 51 is inserted into the docking slot 121, the first abutment ring 41 drives the first abutment block 43 to rise, and drives the tightening strip 31 to move toward the center of the docking slot 121 through the first guide surface 312.

[0072] The implementation principle of Example 3 of the present application is as follows: under normal conditions (the pressure plate 131 is in the lifted state), the tightening strip 31 is displaced toward the center away from the docking groove 121 under the action of the return spring 123 to expand the sealing sleeve 3 to facilitate the insertion of the air inlet end head 51; in the process of the pressure nozzle 12 pressing down to force the air inlet end head 51 to be inserted into the docking groove 121, the first abutment ring 41 abuts against the reinforcement ring 52 and then stops moving downward, so that the first abutment block 43 can be lifted relative to the pressure nozzle 12, and the tightening strip 31 is driven to move toward the center of the docking groove 121 through the first guide surface 312, so that the sealing sleeve 3 can tighten the outer peripheral wall of the air inlet end head 51, thereby improving the air tightness between the pressure nozzle 12 and the air inlet end head 51, and improving the operational convenience of the overall structure.

[0073] Example 4

[0074] The embodiment of the present application discloses an ultrasonic gas meter built-in valve air tightness detection device.

[0075] Reference Fig.10 , Fig.11 The difference between the ultrasonic gas meter built-in valve air tightness detection device disclosed in the embodiment of the present application and the embodiment 3 is that:

[0076] In this embodiment, the peripheral wall of the docking groove 121 is provided with an expansion groove 127, and the expansion groove 127 is located at the top of the movable groove 122. Each movable groove 122 is connected to the expansion groove 127. A rotating plate 6 is adapted to be installed in the expansion groove 127. The rotating plate 6 and the pressure nozzle 12 are coaxially arranged. The rotating plate 6 is rotatably installed in the expansion groove 127. The plate surface of the rotating plate 6 is provided with a through hole 66 for the gas of the inflation tube 142 to enter the docking groove 121; a plurality of second abutment blocks 61 are fixedly installed on the bottom wall of the rotating plate 6. The number of the second abutment blocks 61 is arranged corresponding to the number of the tightening strips 31, and the upper end surface of each tightening strip 31 is provided with a second insertion groove 313, and the second insertion groove 313 has a second guide surface 314; the pressing nozzle 12 is provided with a rotating component 7, and when the air inlet end 51 is inserted into the docking groove 121, the rotating component 7 forces the rotating plate 6 to rotate around its own central axis, so that the second abutment block 61 is rotated into the second insertion groove 313 and drives the tightening strip 31 to move toward the center of the docking groove 121 through the second guide surface 314.

[0077] Reference Fig.10 , Fig.12 , Fig.13The rotating assembly 7 includes a second abutting ring 71, a second connecting column 72 and an inclined rod 73. The second abutting ring 71 is annular and is coaxially arranged with the pressure nozzle 12. The inner diameter of the second abutting ring 71 is larger than the outer diameter of the first abutting ring 41. The second abutting ring 71 is slidably installed at the bottom of the pressure nozzle 12 to abut the surface of the shell 5. A plurality of third plug-in grooves 62 are provided on the surface of the rotating plate 6. The plurality of third plug-in grooves 62 are arranged at intervals around the central axis of the rotating plate 6. The number of second connecting columns 72 The second connecting column 72 is arranged in a vertical position corresponding to the number of the third plug-in slots 62, one end of the second connecting column 72 is fixedly connected to the second abutting ring 71, and the other end is inserted into the press nozzle 12; one end of the inclined rod 73 is connected to the second connecting column 72, and the other end passes through the third plug-in slot 62. When the air inlet end 51 is inserted into the docking slot 121, the second abutting ring 71 drives the inclined rod 73 to rise, and forces the second abutting block 61 of the rotating plate 6 to rotate into the second plug-in slot 313 through the third plug-in slot 62. The press nozzle 12 is provided with an avoidance groove 128 for the second connecting column 72 and the inclined rod 73 to pass through.

[0078] It should be noted that, in the present embodiment, a first sealing ring (not shown in the figure) is bonded and fixed to the lower surface of the first abutting ring 41, and a second sealing ring (not shown in the figure) is bonded and fixed to the lower surface of the second abutting ring 71. Both the first sealing ring and the second sealing ring are made of rubber. When the pressure nozzle 12 is pressed downward, the first sealing ring is pressed against the reinforcing ring 52, and the second sealing ring is pressed against the surface of the shell 5, so as to further improve the air tightness between the pressure nozzle 12 and the air inlet end 51.

[0079] The implementation principle of the embodiment 4 of the present application is as follows: during the downward pressing process of the pressure nozzle 12, the tightening strip 31 is displaced toward the center of the docking groove 121 under the action of the clamping assembly 4. At the same time, the second abutting ring 71 stops moving downward after abutting against the surface of the shell 5, so that the inclined rod 73 can be lifted relative to the pressure nozzle 12, and the rotating plate 6 is driven to rotate through the third plug-in groove 62, so that the second abutting block 61 is transferred into the second plug-in groove 313 and the tightening strip 31 is driven to move toward the center of the docking groove 121 through the second guide surface 314. The cooperation between the rotating plate 6 and the clamping assembly 4 greatly improves the pushing effect of the tightening strip 31, thereby improving the clamping effect of the sealing sleeve 3 on the air inlet end 51, and further improving the air tightness between the pressure nozzle 12 and the air inlet end 51.

[0080] Example 5

[0081] The embodiment of the present application discloses an ultrasonic gas meter built-in valve air tightness detection device.

[0082] Reference Fig.14 , Fig.15 The difference between the ultrasonic gas meter built-in valve air tightness detection device disclosed in the embodiment of the present application and the embodiment 4 is that:

[0083] In the present embodiment, an inflation chamber 124 is provided in the pressure nozzle 12, and the inflation chamber 124 is located at the top of the docking groove 121. The end of the inflation tube 142 away from the air source tube 141 is connected to the inflation chamber 124; the bottom wall of the inflation chamber 124 is provided with a first air vent 125 connected to the docking groove 121, and the plate surface of the rotating plate 6 is provided with a second air vent 63 connected to the first air vent 125 (the second air vent 63 is equivalent to the through hole 66 in Example 4).

[0084] The inner wall of the docking groove 121 is provided with a plurality of embedding grooves 129, and the plurality of embedding grooves 129 are arranged at intervals around the central axis of the pressing nozzle 12, and the embedding grooves 129 are located between two adjacent movable grooves 122, and an inflatable bag 8 is bonded and fixed in each embedding groove 129, and a mounting piece 81 is fixedly mounted on the top wall of the inflatable bag 8, and the mounting piece 81 is fixedly connected to the inner wall of the embedding groove 129; a third air vent 126 is provided on the bottom wall of the inflatable cavity 124, a fourth air vent 64 is provided on the plate surface of the rotating plate 6, and a fifth air vent 811 connected to the inside of the inflatable bag 8 is provided on the surface of the mounting piece 81; when the air inlet end 51 is inserted into the docking groove 121 and forces the second abutting block 61 of the rotating plate 6 to abut against the second guide surface 314, the third air vent 126, the fourth air vent 64 and the fifth air vent 811 are connected to each other.

[0085] The implementation principle of Example 5 of the present application is as follows: after the air inlet end 51 completely enters the docking groove 121, the third air vent 126, the fourth air vent 64 and the fifth air vent 811 are interconnected, and part of the gas in the inflation chamber 124 enters the inflation bag 8 through the third air vent 126, the fourth air vent 64 and the fifth air vent 811 in sequence, causing the inflation bag 8 to expand and press against the outer wall of the sealing sleeve 3, thereby improving the clamping effect of the sealing sleeve 3 on the outer wall of the air inlet end 51, thereby improving the air tightness between the pressure nozzle 12 and the air inlet end 51, and improving the detection accuracy of the air tightness of the valve body 53.

[0086] Example 6

[0087] The embodiment of the present application discloses an ultrasonic gas meter built-in valve air tightness detection device.

[0088] Reference Fig.16 The difference between the ultrasonic gas meter built-in valve air tightness detection device disclosed in the embodiment of the present application and embodiment 5 is that:

[0089] In this embodiment, a guide block 67 is installed in the second air vent 63, and the guide block 67 is located at the center of the second air vent 63. A plurality of guide blades 65 are fixedly installed on the outer peripheral wall of the guide block 67. The plurality of guide blades 65 are arranged at intervals around the central axis of the rotating plate 6, and each guide blade 65 is fixedly installed on the inner peripheral wall of the second air vent 63 on the side away from the guide block 67.

[0090] Reference Fig.16 In the present embodiment, a flow passage 651 for gas to pass through is formed between two adjacent guide blades 65, and each guide blade 65 is arranged at an angle so that the flow passage 651 is inclined. When the air intake end 51 is inserted into the docking groove 121 and inflated, the air flow passes through the guide blades 65 to form a driving force on the rotating plate 6 to force the second abutment block 61 to press against the second guide surface 314; it should be noted that in the present embodiment, when the air intake end 51 is inserted into the docking groove 121 and the end surface of the air intake end 51 away from the shell 5 is not in abutment with the rotating plate 6, the docking groove 121 can be inflated through the inflation tube 142 to maximize the driving effect of the guide blades 65.

[0091] The implementation principle of the embodiment 6 of the present application is as follows: when the air inlet head 51 enters the docking groove 121 and is inflated, the gas in the inflation chamber 124 enters the valve body 53 from the first vent 125, the second vent 63, and the air inlet head 51 in sequence. When the gas passes through the second vent 63, it can act on the rotating plate 6 through the guide vane 65, forcing the rotating plate 6 to have a driving force for rotation. This driving force can improve the tightening effect of the second abutment block 61 on the tightening strip 31, thereby improving the tightening effect of the sealing sleeve 3 on the air inlet head 51. After the air inlet head 51 is fully inserted into the docking groove 121, the end face of the air inlet head 51 abuts against the rotating plate 6, reducing the possibility of the rotating plate 6 rotating.

[0092] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An ultrasonic gas meter built-in valve air tightness detection device, characterized in that: The invention comprises a mounting frame (1), a positioning seat (11), a pressure nozzle (12), a lifting assembly (13) and an air supply detection assembly (14); the positioning seat (11) is mounted on the bottom of the mounting frame (1) and is provided with a plurality of them, and the top of each positioning seat (11) has a convex portion (111) for embedding into a shell (5); the pressure nozzle (12) is slidably mounted on the mounting frame (1) and is provided with a plurality of them, and the plurality of pressure nozzles (12) are correspondingly arranged with the plurality of positioning seats (11); when the shell (5) is placed on the positioning seat (11) and the convex portion (111) is embedded in the shell (5), the pressure nozzle (12) is directly opposite to the air inlet end (51) of the shell (5) on the corresponding positioning seat (11); The lifting assembly (13) is arranged on the mounting frame (1) to drive all the pressure nozzles (12) to rise and fall synchronously, and the air supply detection assembly (14) is arranged on the pressure nozzle (12) to fill the air into the air inlet end (51) of the shell (5) and detect the air pressure; the air supply detection assembly (14) comprises an air source pipe (141), an air charging pipe (142) and a U-tube pressure gauge (143); the air source pipe (141) is provided with a pressure regulating valve (144) and a set valuer (145) in sequence along the air supply direction; the number of the air charging pipes (142) is arranged corresponding to the number of the pressure nozzles (12), one end of each of the air charging pipes (142) is connected to the air source pipe (141), and the other end is connected to the pressure regulating valve (144) and the set valuer (145). Corresponding to the interior of the pressure nozzle (12), the U-tube pressure gauge (143) is connected to the inflation tube (142) for detecting air pressure; the pressure nozzle (12) has a docking groove (121) for inserting the air inlet end head (51), a sealing sleeve (3) is installed in the docking groove (121), and the sealing sleeve (3) is elastically arranged to tighten the outer peripheral wall of the air inlet end head (51); the outer peripheral wall of the sealing sleeve (3) is provided with a plurality of tightening strips (31), and the plurality of tightening strips (31) are arranged at intervals around the outer peripheral wall of the sealing sleeve (3), and each of the tightening strips (31) is slidably installed in the docking groove (121) and can be displaced along the radial direction of the pressure nozzle (12); the pressure nozzle (12) is provided with A clamping assembly (4) is provided. When the air inlet end (51) is inserted into the docking groove (121), the clamping assembly (4) drives the tightening strip (31) to move toward the center of the docking groove (121); a plurality of movable grooves (122) are provided on the inner wall of the docking groove (121). The plurality of movable grooves (122) are arranged corresponding to the plurality of tightening strips (31). Each of the tightening strips (31) is slidably installed in the corresponding movable groove (122) and can move radially along the pressure nozzle (12); a return spring (123) is provided between the tightening strip (31) and the inner wall of the movable groove (122). The return spring (123) causes the tightening strip (31) to move away from the center of the docking groove (121);The clamping assembly (4) comprises a first abutment ring (41), a first connecting column (42) and a first abutment block (43); the first abutment ring (41) is slidably mounted on the bottom of the pressing nozzle (12); a first insertion groove (311) is provided on the lower end surface of the tightening strip (31); the first insertion groove (311) has a first guide surface (312); one end of the first connecting column (42) is connected to the first abutment ring (41), and the other end is inserted into the first abutment block (43); A plug-in slot (311) is connected to the first abutment block (43); a reinforcing ring (52) for abutment by the first abutment ring (41) is installed at the connection between the air inlet end head (51) and the housing (5); when the air inlet end head (51) is inserted into the docking slot (121), the first abutment ring (41) drives the first abutment block (43) to rise, and drives the tightening strip (31) to move toward the center of the docking slot (121) through the first guide surface (312).

2. The ultrasonic gas meter built-in valve air tightness detection device according to claim 1, characterized in that: The top wall of the convex portion (111) is provided with a mounting groove (112), and the two opposite side walls of the convex portion (111) are provided with a rotation arc groove (113) connected to the mounting groove (112), and each of the rotation arc grooves (113) is provided with a rotation arc rod (114), and the rotation arc rod (114) is installed in the rotation arc groove (113) and can rotate around the virtual center axis of the rotation arc groove (113); the end of the rotation arc rod (114) away from the mounting groove (112) forms a first positioning surface (11 41), the outer wall of the convex portion (111) has a second positioning surface (1111), and the second positioning surface (1111) and the first positioning surfaces (1141) of the two rotating arc rods (114) are arranged in a triangle so as to abut against different inner walls of the housing (5); the convex portion (111) is provided with a driving component (2), and the driving component (2) is used to drive the first positioning surfaces (1141) of the two rotating arc rods (114) to synchronously rotate out of the rotating arc groove (113) or synchronously rotate into the rotating arc groove (113).

3. The ultrasonic gas meter built-in valve air tightness detection device according to claim 2, characterized in that: The driving assembly (2) comprises a sliding bar (21), a first pushing block (22), a second pushing block (23) and a driving member, wherein the sliding bar (21) is slidably installed in the installation groove (112), the first pushing block (22) and the second pushing block (23) are both installed on the sliding bar (21), a pushing gap (24) is formed between the first pushing block (22) and the second pushing block (23), and one end of each rotating arc rod (114) away from the first positioning surface (1141) extends into the pushing gap (24); The driving member is arranged between the sliding bar (21) and the mounting frame (1); when the pressing nozzle (12) is pressed down, the driving member drives the sliding bar (21) to slide, and forces the first positioning surface (1141) of the rotating arc rod (114) to rotate out of the rotating arc groove (113) through the first pushing block (22); when the pressing nozzle (12) is lifted, the driving member drives the sliding bar (21) to slide in the opposite direction, and forces the first positioning surface (1141) of the rotating arc rod (114) to rotate into the rotating arc groove (113) through the second pushing block (23).

4. The ultrasonic gas meter built-in valve air tightness detection device according to claim 1, characterized in that: A rotating plate (6) is rotatably mounted on the top wall of the docking groove (121), a second abutment block (61) is disposed on the bottom wall of the rotating plate (6), a second insertion groove (313) is provided on the upper end surface of the tightening strip (31), and the second insertion groove (313) has a second guide surface (314); the pressing nozzle (12) is provided with a rotating assembly (7), and when the air inlet end (51) is inserted into the docking groove (121), the rotating assembly (7) forces the rotating plate (6) to rotate, so that the second abutment block (61) is rotated into the second insertion groove (313) and drives the tightening strip (31) to move toward the center of the docking groove (121) through the second guide surface (314).

5. The ultrasonic gas meter built-in valve air tightness detection device according to claim 4, characterized in that: The rotating assembly (7) comprises a second abutment ring (71), a second connecting column (72) and an inclined rod (73). The second abutment ring (71) is slidably mounted on the bottom of the pressure nozzle (12) for abutting the surface of the shell (5). A third plug-in slot (62) is provided on the surface of the rotating plate (6). One end of the second connecting column (72) is connected to the second abutment ring (71), and the other end is inserted into the pressure nozzle (12). One end of the inclined rod (73) is connected to the second connecting column (72), and the other end is inserted into the third plug-in slot (62). When the air inlet end (51) is inserted into the docking slot (121), the second abutment ring (71) drives the inclined rod (73) to rise, and forces the second abutment block (61) of the rotating plate (6) to rotate into the second plug-in slot (313) through the third plug-in slot (62).

6. The ultrasonic gas meter built-in valve air tightness detection device according to claim 4, characterized in that: An air-filling cavity (124) is provided in the pressure nozzle (12), and the air-filling cavity (124) is located at the top of the docking groove (121); the end of the air-filling tube (142) away from the air source tube (141) is connected to the air-filling cavity (124); a first air vent (125) connected to the docking groove (121) is provided on the bottom wall of the air-filling cavity (124); a second air vent (63) connected to the first air vent (125) is provided on the plate surface of the rotating plate (6); a third air vent (126) is provided on the bottom wall of the air-filling cavity (124); A fourth vent (64) is provided, an inflatable bag (8) is provided between two adjacent tightening strips (31), a mounting plate (81) is provided on the top wall of the inflatable bag (8), and a fifth vent (811) connected to the interior of the inflatable bag (8) is provided on the surface of the mounting plate (81); when the air inlet end (51) is inserted into the docking groove (121) and forces the second abutting block (61) of the rotating plate (6) to abut against the second guide surface (314), the third vent (126), the fourth vent (64) and the fifth vent (811) are connected to each other.

7. The ultrasonic gas meter built-in valve air tightness detection device according to claim 6, characterized in that: A plurality of guide blades (65) are installed in the second vent (63). The plurality of guide blades (65) are arranged at intervals around the central axis of the rotating plate (6), and a ventilation flow channel (651) for gas to pass through is formed between two adjacent guide blades (65); the ventilation flow channel (651) is arranged at an angle, and when the air inlet end (51) is inserted into the docking groove (121) and inflated, the air flow passes through the guide blades (65) to form a driving force on the rotating plate (6) that forces the second abutment block (61) to abut against the second guide surface (314).

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