Butterfly valve airtightness detection equipment

Abstract

The utility model discloses butterfly valve air tightness detection equipment, which relates to the technical field of butterfly valve production detection and comprises a frame body, a detection water tank is arranged in the frame body, and a first sealing clamping mechanism and a second sealing clamping mechanism are arranged in the detection water tank. A butterfly valve is clamped between the first sealing and clamping mechanism and the second sealing and clamping mechanism; the first sealing and clamping mechanism is fixedly connected to the turnover mechanism, and the turnover mechanism is movably connected into the detection water tank; the first sealing and clamping mechanism comprises a clamping tool and a clamping air cylinder provided with a plugging disc, one end of the butterfly valve is matched with the plugging disc in an abutting and sealing mode, and the other end of the butterfly valve is matched with the second sealing and clamping mechanism in an abutting and sealing mode. According to the utility model, the main seal of the butterfly valve and the shell of the butterfly valve can be independently subjected to air tightness testing, labor force is saved, tedious procedures are simplified, frequent tool replacement is not needed, and the butterfly valve air tightness testing device has the advantages of reasonable design, convenience in use, high quality and high efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to butterfly valve production detection technical field especially relates to a butterfly valve air tightness detection equipment. BACKGROUND

[0002] At present, butterfly valve carries out air tightness detection mainly to adopt self -made frock, seals butterfly valve, closes butterfly valve door, upper and lower cavities are in relative closed state, utilizes frock to clamp and seals one cavity of butterfly valve and immerses in water, makes another cavity of butterfly valve submerges in water, continuously supplies air to the cavity of butterfly valve clamped, observes whether the cavity immersed in water has the phenomenon of bubbling, this is main sealing air tightness test. Then, the frock and butterfly valve are taken out from the water, the valve is opened, the two cavities of the butterfly valve are connected, and the two ends of the two cavities are sealed and clamped by the frock and then immersed in water, air is continuously supplied into the cavity of the butterfly valve, and the bubbling phenomenon is observed again, which is the air tightness test of the butterfly valve shell. The whole test process needs to disassemble and assemble the sealing frock constantly, the manual work intensity is large, the assembly frequency is frequent, which leads to the cumbersome whole test process. SUMMARY

[0003] The utility model discloses a butterfly valve air tightness detection equipment, solve the problem that the air tightness detection technology of butterfly valve is constantly disassembled and assembled, the manual work intensity is large, the assembly frequency is frequent, which leads to the cumbersome whole test process mentioned in the background art.

[0004] The utility model discloses a butterfly valve air tightness detection equipment, solve the problem that the air tightness detection technology of butterfly valve is constantly disassembled and assembled, the manual work intensity is large, the assembly frequency is frequent, which leads to the cumbersome whole test process mentioned in the background art.

[0005] The utility model discloses a butterfly valve air tightness detection equipment, solve the problem that the air tightness detection technology of butterfly valve is constantly disassembled and assembled, the manual work intensity is large, the assembly frequency is frequent, which leads to the cumbersome whole test process mentioned in the background art.

[0006] The first sealing clamping mechanism is fixedly connected on the turnover mechanism, and the turnover mechanism is movably connected in the detection water tank.

[0007] The first sealing clamping mechanism includes a clamping frock and a clamping cylinder, the clamping frock and the clamping cylinder are fixedly connected on the turnover mechanism, a blocking disc is arranged on the piston end of the clamping cylinder, an air passage is arranged in the blocking disc, one end of the butterfly valve is sealingly pressed against the blocking disc, the other end of the butterfly valve is sealingly pressed against the second sealing clamping mechanism, and the butterfly valve is placed on the clamping frock.

[0008] Further, the detection water tank is connected with a water level lifting assembly, the water level lifting assembly comprises an air storage tank, the air storage tank is fixedly connected in the frame body, an air path pipe is arranged on the air storage tank, a gas injection pipe is arranged on the air path pipe, the gas injection pipe communicates with a water level pressure box after penetrating through the detection water tank, and the pipe wall of the gas injection pipe is sealingly connected with the detection water tank and the water level pressure box;

[0009] The water level pressure box is arranged in the detection water tank below the first sealing clamping mechanism and the second sealing clamping mechanism, the water level pressure box is a box structure with a closed top and an open bottom, and a water passing channel is left between the bottom opening and the side wall of the water level pressure box and the detection water tank.

[0010] An adjusting valve, an exhaust valve and an air inlet valve are arranged on the air path pipe.

[0011] Further, the butterfly valve is clamped on the clamping tool, and a groove matched with the clamping of the butterfly valve is arranged on the clamping tool.

[0012] Further, the turnover mechanism comprises a turnover plate, a supporting plate is arranged on the turnover plate, the clamping cylinder is arranged on the turnover plate, and the clamping tool is arranged on the supporting plate.

[0013] A turnover cylinder is arranged below the supporting plate, the extension end of the turnover cylinder is rotationally connected with a first turnover shaft, and the first turnover shaft is arranged at the bottom of the turnover plate.

[0014] Dipper bars are arranged on both sides of the upper part of the turnover plate, one end of the dipper bar is rotationally connected with the turnover plate, and the other end of the dipper bar is rotationally connected with a fixed dipper bar seat, second turnover shafts are arranged on both sides of the lower part of the turnover plate, the second turnover shafts are rotationally connected with a sliding assembly, and the dipper bar seat and the sliding assembly are arranged in the detection water tank.

[0015] The shaft center of the first turnover shaft coincides with the shaft center of the second turnover shaft.

[0016] Further, the sliding assembly comprises a sliding block and a guide sliding rod, the sliding block is rotationally connected with the second turnover shaft, the sliding block is slidingly connected with the guide sliding rod, and the guide sliding rod is arranged in the detection water tank.

[0017] Two limiting blocks are arranged on the guide sliding rod, and the two limiting blocks are respectively located at the maximum stroke of the sliding block.

[0018] Further, a fixed seat is arranged, the fixed seat comprises a first fixed plate and a second fixed plate, the first fixed plate and the second fixed plate are fixedly connected with the inner side walls of the detection water tank respectively, and the first fixed plate and the second fixed plate are fixedly connected through a connecting rod.

[0019] The swing rod base is fixedly connected to the first fixed plate, and both ends of the guide sliding rod are fixedly connected to the first fixed plate and the second fixed plate.

[0020] Further, the telescopic end of the turnover cylinder is connected with a pull rod through a floating joint, and the pull rod is rotatably connected with the first turnover shaft through a fish eye joint bearing at an end away from the floating joint.

[0021] Still further, the second sealing clamping mechanism comprises a sealing cylinder, which is fixedly connected to the side wall of the detection water tank, and a sealing end cover is arranged at the piston end of the sealing cylinder, and the sealing end cover is in sealing abutting connection with the butterfly valve.

[0022] Compared with the prior art, the butterfly valve air tightness detection equipment has the beneficial technical effects that:

[0023] The butterfly valve air tightness detection equipment can separately test the air tightness of the main sealing of the butterfly valve and the butterfly valve shell, has high testing precision, saves labor, simplifies complicated procedures, and does not need to frequently replace tooling, and has the advantages of reasonable design, convenient use, high quality and high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model will be further described in connection with the drawings.

[0025] Figure 1 It is structure schematic diagram of butterfly valve air tightness detection equipment of the utility model;

[0026] Figure 2 It is cross section of butterfly valve air tightness detection equipment of the utility model Figure 1 ;

[0027] Figure 3 It is structure schematic diagram of water level lifting subassembly in butterfly valve air tightness detection equipment of the utility model Figure 1 ;

[0028] Figure 4 It is structure schematic diagram of water level lifting subassembly in butterfly valve air tightness detection equipment of the utility model Figure 2 ;

[0029] Figure 5 It is structure schematic diagram of butterfly valve in butterfly valve air tightness detection equipment of the utility model;

[0030] Figure 6 It is structure schematic diagram of clamping mechanism in butterfly valve air tightness detection equipment of the utility model;

[0031] Figure 7 It is structure schematic diagram of fixed seat and turnover mechanism in butterfly valve air tightness detection equipment of the utility model;

[0032] Figure 8 It is the turnover mechanism structural schematic view in the butterfly valve air tightness detection equipment of the utility model;

[0033] Figure 9 It is the working flow chart of the butterfly valve air tightness detection equipment of the utility model.

[0034] The drawing mark is explained: 1, frame body;2, operation panel;3, detection water tank;4, fixed seat;4-1, first fixed plate;4-2, second fixed plate;4-3, connecting rod;5, first sealing clamping mechanism;5-1, clamping tool;5-2, clamping cylinder;5-3, plugging disc;5-4, air passage;5-5, recess;6, turnover mechanism;6-1, turnover plate;6-2, turnover cylinder;6-3, swing rod;6-4, fish eye joint bearing;6-5, sliding assembly;6-6, pull rod;6-7, floating joint;6-8, limit block;6-9, supporting plate;6-10, first turnover shaft;6-11, second turnover shaft;6-12, swing rod seat;7, second sealing clamping mechanism;7-1, sealing cylinder;7-2, sealing end cover;8, butterfly valve;8-1, butterfly valve shell;8-2, main seal;8-3, handle;9, water level lifting assembly;9-1, gas storage tank;9-2, gas path pipe;9-3, regulating valve;9-4, exhaust valve;9-5, inlet valve;9-6, gas injection pipe;9-7, water level pressure box;9-8, water passage. DETAILED DESCRIPTION

[0035] In order to make the technical problem, technical scheme and beneficial effect to be solved in the utility model more clearly, the following is in combination with the drawings and examples, and the utility model is further explained in detail.

[0036] As Figures 1-2 The utility model discloses a butterfly valve air tightness detection equipment, including frame body 1, the frame body 1 is provided with the detection water tank 3 of elevatable water level, and the detection water tank 3 is connected with water level lifting assembly 9, and the detection water tank 3 is provided with the coaxial arrangement of first sealing clamping mechanism 5 and second sealing clamping mechanism 7, and the butterfly valve 8 is clamped between first sealing clamping mechanism 5 and second sealing clamping mechanism 7. First sealing clamping mechanism 5 is fixedly connected on turnover mechanism 6, and turnover mechanism 6 is movably connected in the detection water tank 3.

[0037] As Figures 3-4As shown, the water level lifting component 9 includes an air storage tank 9-1, which stores compressed gas. When the gas is insufficient, it can be replenished by connecting to an external air pumping device through an external pipe. The air storage tank 9-1 is fixedly connected inside the frame 1. An air passage pipe 9-2 is installed on the air storage tank 9-1, and an air injection pipe 9-6 is installed on the air passage pipe 9-2. The air injection pipe 9-6 passes through the detection water tank 3 and connects to the water level pressure tank 9-7. The wall of the air injection pipe 9-6 is sealed to the walls of the detection water tank 3 and the water level pressure tank 9-7. The gas in the air storage tank 9-1 can enter the water level pressure tank 9-7 through the air passage pipe 9-2 and the air injection pipe 9-6.

[0038] The water level pressure box 9-7 is located inside the detection water tank 3 below the first sealing clamping mechanism 5 and the second sealing clamping mechanism 7. The water level pressure box 9-7 is a box structure with a closed top and an open bottom. The bottom opening and side wall of the water level pressure box 9-7 form a water passage 9-8 with the detection water tank 3 to facilitate the outward flow of water in the water level pressure box 9-7. When the air tank 9-1 pumps air into the water level pressure box 9-7, the gas compresses the water, causing the water to flow from the water passage 9-8 into the outside of the water level pressure box 9-7 and causing the water level in the detection water tank 3 to rise.

[0039] During operation, water is first injected into the detection water tank 3. The water flows into the water level pressure tank 9-7 through the water passage 9-8, ensuring that the water level does not exceed the opening of the air injection pipe 9-6. Water injection then stops, and the water levels on both the inside and outside of the water level pressure tank 9-7 remain consistent during this static state. When the air tank 9-1 pumps air into the water level pressure tank 9-7 through the air injection pipe 9-6, the gas compresses the water level downwards within the sealed space of the water level pressure tank 9-7. This causes the water level on the outside of the water level pressure tank 9-7 in the detection water tank 3 to rise until it submerges the butterfly valve 8.

[0040] The gas pipe 9-2 is also equipped with a regulating valve 9-3, an exhaust valve 9-4, and an intake valve 9-5. When the exhaust valve 9-4 is closed and the intake valve 9-5 is open, the gas entering the gas storage tank 9-1 flows through the gas pipe 9-2 and the injection pipe 9-6 into the water level pressure tank 9-7, causing the water level outside the pressure tank 9-7 to rise. When the intake valve 9-5 is closed and the exhaust valve 9-4 is open, the gas in the pressure tank 9-7 is exhausted to the outside through the injection pipe 9-6, the gas pipe 9-2, and the exhaust valve 9-4, causing the water level outside the pressure tank 9-7 to drop. The regulating valve 9-3 regulates the gas flow rate in the gas pipe 9-2 to control the rate at which the water level is raised.

[0041] like Figure 5 As shown, the butterfly valve 8 includes a butterfly valve housing 8-1, a main seal 8-2 is provided inside the butterfly valve housing 8-1, and a handle 8-3 is provided on the butterfly valve housing 8-1. By rotating the handle 8-3, the main seal 8-2 can be switched so that the internal cavity of the butterfly valve 8 can be connected or relatively closed.

[0042] As shown in Figure 6 , the first sealing clamping mechanism 5 includes a clamping tool 5-1 and a clamping cylinder 5-2, both of which are fixedly connected to the turnover mechanism 6. The piston end of the clamping cylinder 5-2 is provided with a blocking disc 5-3, and the blocking disc 5-3 is provided with an air passage 5-4. The air passage 5-4 is connected to an external inflator through a hose. One end of the butterfly valve 8 is in sealing contact with the blocking disc 5-3, and the air passage 5-4 is in communication with the cavity of the butterfly valve 8. The other end of the butterfly valve 8 is in sealing contact with the second sealing clamping mechanism 7. The butterfly valve 8 is clamped on the clamping tool 5-1. The clamping tool 5-1 is provided with a groove 5-5 for clamping the butterfly valve 8. The butterfly valve 8 is clamped between the clamping tool 5-1 and the blocking disc 5-3. When the air tightness is detected, the external inflator inflates through the hose, the air passage 5-4, and finally into the cavity of the butterfly valve 8.

[0043] As shown in Figure 7 and Figure 8 , the turnover mechanism 6 includes a turnover plate 6-1, and the turnover plate 6-1 is fixedly connected with a supporting plate 6-9. The clamping cylinder 5-2 is fixedly connected to the turnover plate 6-1. The turnover plate 6-1 is provided with a reserved hole for the extension end of the clamping cylinder 5-2 to move. The clamping tool 5-1 is fixedly connected to the supporting plate 6-9.

[0044] The supporting plate 6-9 is provided with a turnover cylinder 6-2 below. The extension end of the turnover cylinder 6-2 is rotatably connected to a first turnover shaft 6-10, which is arranged at the bottom of the turnover plate 6-1.

[0045] Both sides of the upper part of the turnover plate 6-1 are provided with swing rods 6-3. One end of each swing rod 6-3 is rotatably connected to the turnover plate 6-1, and the other end is rotatably connected to a fixed swing rod seat 6-12.

[0046] Both sides of the lower part of the turnover plate 6-1 are provided with second turnover shafts 6-11, which are rotatably connected to a sliding assembly 6-5. The axis of the first turnover shaft 6-10 coincides with the axis of the second turnover shaft 6-11. In this embodiment, the swing rod seat 6-12 and the sliding assembly 6-5 are arranged in the detection water tank 3.

[0047] In this embodiment, the sliding assembly 6-5 includes a sliding block 6-5-1 and a guide sliding rod 6-5-2. The sliding block 6-5-1 is rotatably connected to the second turnover shaft 6-11, and the sliding block 6-5-1 is slidably connected to the guide sliding rod 6-5-2. The guide sliding rod 6-5-2 is arranged in the detection water tank 3. Two limiting blocks 6-8 are arranged on the guide sliding rod 6-5-2, and each limiting block 6-8 is located at the maximum stroke of the sliding block 6-5-1 to limit the movement of the sliding block 6-5-1.

[0048] As an embodiment that the swing rod seat 6-12 and the sliding assembly 6-5 are arranged in the detection water tank 3, in the embodiment, a fixed seat 4 is further arranged in the detection water tank 3, the fixed seat 4 comprises a first fixed plate 4-1 and a second fixed plate 4-2, the first fixed plate 4-1 and the second fixed plate 4-2 are respectively fixedly connected to the inner side wall of the detection water tank 3, and the first fixed plate 4-1 and the second fixed plate 4-2 are fixedly connected through a connecting rod 4-3. The swing rod seat 6-12 is fixedly connected to the first fixed plate 4-1, and the two ends of the guide sliding rod 6-5-2 are respectively fixedly connected to the first fixed plate 4-1 and the second fixed plate 4-2.

[0049] As an embodiment that the swing rod seat 6-12 and the sliding assembly 6-5 are arranged in the detection water tank 3, in the embodiment, a fixed seat 4 is further arranged in the detection water tank 3, the fixed seat 4 comprises a first fixed plate 4-1 and a second fixed plate 4-2, the first fixed plate 4-1 and the second fixed plate 4-2 are respectively fixedly connected to the inner side wall of the detection water tank 3, and the first fixed plate 4-1 and the second fixed plate 4-2 are fixedly connected through a connecting rod 4-3. The swing rod seat 6-12 is fixedly connected to the first fixed plate 4-1, and the two ends of the guide sliding rod 6-5-2 are respectively fixedly connected to the first fixed plate 4-1 and the second fixed plate 4-2.

[0050] When the turnover cylinder 6-2 is started, the piston rod of the turnover cylinder 6-2 is recovered to drive the pull rod 6-6 to move towards the side of the turnover cylinder 6-2, thereby pulling the lower end of the turnover plate 6-1 to move. Since the turnover plate 6-1 is rotationally connected to the first fixed plate 4-1 through the swing rod 6-3, the whole turnover plate 6-1 will be turned up by 90 degrees under the action of the swing rod 6-3.

[0051] The second sealing clamping mechanism 7 comprises a sealing cylinder 7-1, the sealing cylinder 7-1 is fixedly connected to the side wall of the detection water tank 3 opposite to the first sealing clamping mechanism 5, and the piston end of the sealing cylinder 7-1 is movably arranged through the side wall of the detection water tank 3. The piston end of the sealing cylinder 7-1 is provided with a sealing end cover 7-2, and the sealing end cover 7-2 is in sealing abutting connection with the cavity port of the butterfly valve 8.

[0052] In the embodiment, the frame body 1 is provided with an operation panel 2, the operation panel 2 is provided with a pressure gauge, a pressure regulating valve, an indicator lamp and a control switch, the pressure gauge is connected with the pressure regulating valve and is used for displaying pressure; the pressure regulating valve is used for controlling the pressure adjustment of the air inflation device to the cavity of the butterfly valve 8 through the air passage 5-4.

[0053] As shown in Figures 1-9 The working principle of the utility model is as follows:

[0054] First, the butterfly valve shell 8-1 is tested for air tightness, the butterfly valve 8 is clamped on the clamping tool 5-1, and the handle 8-3 is turned to keep the cavity in the butterfly valve 8 in communication, the clamping cylinder 5-2 starts to clamp one side of the butterfly valve 8, and then the sealing cylinder 7-1 is actuated, the sealing end cover 7-2 clamps the other side of the butterfly valve 8, so that it becomes a completely sealed state. Subsequently, the external inflator device inflates through the air passage 5-4 and finally into the cavity of the butterfly valve 8 to pressurize, at the same time, the inlet valve 9-5 is opened, the exhaust valve 9-4 is closed, the gas injection pipe 9-6 is used to pressurize the water level pressure box 9-7, so that the water level outside the water level pressure box 9-7 is lifted upwards until it exceeds the butterfly valve 8. At this time, the butterfly valve 8 has been immersed in water, and since the cavity of the butterfly valve 8 is pressurized, whether there is air bubble near the butterfly valve 8 can be judged to determine whether the butterfly valve shell 8-1 leaks.

[0055] After the butterfly valve shell 8-1 test is completed, the inlet valve 9-5 is closed, the exhaust valve 9-4 is opened, the gas in the water level pressure box 9-7 is discharged through the gas injection pipe 9-6 and the air passage 9-2, at this time, the water level outside the water level pressure box 9-7 in the water tank 3 is detected to be lowered and reset, the pressurization of the cavity of the butterfly valve 8 through the air passage 5-4 is stopped, and the handle 8-3 is slowly turned to switch the main seal 8-2 so that the cavity in the butterfly valve 8 is relatively closed. The piston end of the sealing cylinder 7-1 is retracted, and the turnover cylinder 6-2 is actuated to turn over the butterfly valve 8 by 90°, at this time, one cavity of the butterfly valve 8 is vertically upward, at this time, the pressurization of the cavity of the butterfly valve 8 through the air passage 5-4 is continued, and water is poured into the upward cavity to observe whether air bubbles are generated, which can determine whether the main seal 8-2 leaks. After the test is completed, the turnover mechanism 6 is reset, the clamping cylinder 5-2 is retracted, and the butterfly valve 8 is removed, and the above is the overall test process.

[0056] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A butterfly valve air tightness detection device, comprising a frame body (1), characterized in that: The frame body (1) is provided with a detection water tank (3) capable of lifting water level, the detection water tank (3) is provided with a first sealing clamping mechanism (5) and a second sealing clamping mechanism (7) arranged on the same axis line, and a butterfly valve (8) is clamped between the first sealing clamping mechanism (5) and the second sealing clamping mechanism (7); The first sealing clamping mechanism (5) is fixedly connected to a turnover mechanism (6), and the turnover mechanism (6) is movably connected in the detection water tank (3); The first sealing clamping mechanism (5) comprises a clamping tool (5-1) and a clamping cylinder (5-2), both of which are fixedly connected to the turnover mechanism (6), a piston end of the clamping cylinder (5-2) is provided with a blocking disc (5-3), the blocking disc (5-3) is provided with an air passage (5-4), one end of the butterfly valve (8) is in abutting and sealing cooperation with the blocking disc (5-3), the other end of the butterfly valve (8) is in abutting and sealing cooperation with the second sealing clamping mechanism (7), and the butterfly valve (8) is placed on the clamping tool (5-1).

2. The butterfly valve air tightness detection apparatus according to claim 1, wherein: The detection water tank (3) is connected with a water level lifting assembly (9), the water level lifting assembly (9) comprises a gas storage tank (9-1), the gas storage tank (9-1) is fixedly connected in the frame body (1), the gas storage tank (9-1) is provided with a gas path pipe (9-2), the gas path pipe (9-2) is provided with a gas injection pipe (9-6), the gas injection pipe (9-6) is communicated with a water level pressure box (9-7) after penetrating through the detection water tank (3), and the pipe wall of the gas injection pipe (9-6) is sealingly connected with the detection water tank (3) and the water level pressure box (9-7); The water level pressure box (9-7) is arranged in the detection water tank (3) below the first sealing clamping mechanism (5) and the second sealing clamping mechanism (7), the water level pressure box (9-7) is a box structure with a closed top and an open bottom, and a water passing channel (9-8) is left between the bottom opening and the side wall of the water level pressure box (9-7) and the detection water tank (3); The gas path pipe (9-2) is provided with an adjusting valve (9-3), an exhaust valve (9-4) and an air inlet valve (9-5).

3. The butterfly valve air tightness detection apparatus according to claim 1, wherein: The butterfly valve (8) is clamped on the clamping tool (5-1), and the clamping tool (5-1) is provided with a groove (5-5) matched with the clamping of the butterfly valve (8).

4. The butterfly valve air tightness detection apparatus of claim 1, wherein: The turnover mechanism (6) comprises a turnover plate (6-1), the turnover plate (6-1) is provided with a supporting plate (6-9), the clamping cylinder (5-2) is arranged on the turnover plate (6-1), and the clamping tool (5-1) is arranged on the supporting plate (6-9); A turnover cylinder (6-2) is arranged below the supporting plate (6-9), a first turnover shaft (6-10) is rotatably connected to the extension end of the turnover cylinder (6-2), and the first turnover shaft (6-10) is arranged at the bottom of the turnover plate (6-1). Both sides of the upper part of the turnover plate (6-1) are provided with a swing rod (6-3), one end of the swing rod (6-3) is rotatably connected with the turnover plate (6-1), and the other end of the swing rod (6-3) is rotatably connected with a fixed swing rod seat (6-12); Both sides of the lower part of the turnover plate (6-1) are provided with a second turnover shaft (6-11), the second turnover shaft (6-11) is rotatably connected with a sliding assembly (6-5), and the swing rod seat (6-12) and the sliding assembly (6-5) are arranged in the detection water tank (3). The shaft center of the first turnover shaft (6-10) coincides with the shaft center of the second turnover shaft (6-11).

5. The butterfly valve air tightness detection apparatus of claim 4, wherein: The sliding assembly (6-5) comprises a sliding block (6-5-1) and a guide sliding rod (6-5-2), the sliding block (6-5-1) is rotatably connected with the second turnover shaft (6-11), the sliding block (6-5-1) is slidably connected with the guide sliding rod (6-5-2), and the guide sliding rod (6-5-2) is arranged in the detection water tank (3). Two limiting blocks (6-8) are arranged on the guide sliding rod (6-5-2), and the two limiting blocks (6-8) are located at the maximum stroke positions of the sliding block (6-5-1) respectively.

6. The butterfly valve air tightness detection apparatus of claim 5, wherein: A fixed seat (4) is further arranged, the fixed seat (4) comprises a first fixed plate (4-1) and a second fixed plate (4-2), the first fixed plate (4-1) and the second fixed plate (4-2) are fixedly connected to the inner side walls of the detection water tank (3) respectively, and the first fixed plate (4-1) and the second fixed plate (4-2) are fixedly connected through a connecting rod (4-3); The swing rod seat (6-12) is fixedly connected to the first fixed plate (4-1), and the two ends of the guide sliding rod (6-5-2) are fixedly connected to the first fixed plate (4-1) and the second fixed plate (4-2) respectively.

7. The butterfly valve air tightness detection apparatus of claim 4, wherein: The telescopic end of the turnover cylinder (6-2) is connected with a pull rod (6-6) through a floating joint (6-7), one end of the pull rod (6-6) away from the floating joint (6-7) is rotatably connected with the first turnover shaft (6-10) through a fisheye joint bearing (6-4).

8. The butterfly valve air tightness testing apparatus of claim 1, wherein: The second sealing clamping mechanism (7) comprises a sealing cylinder (7-1), the sealing cylinder (7-1) is fixedly connected to the side wall of the detection water tank (3), a sealing end cover (7-2) is arranged at the piston end of the sealing cylinder (7-1), and the sealing end cover (7-2) is in abutting and sealing cooperation with the butterfly valve (8).

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