An exhaust valve detection method based on an exhaust valve detection device

Abstract

The application provides an exhaust valve detection method based on an exhaust valve detection device, and belongs to the technical field of detection methods. The method solves the problem that the existing brass exhaust valve can only be detected for air tightness or exhaust performance and has low detection efficiency. The exhaust valve detection method based on the exhaust valve detection device, the detection device comprises a water tank, a lifting cylinder and a mounting seat are installed in the water tank, the lifting cylinder can drive the mounting seat to move vertically, a rotary cylinder is installed on the side wall of the mounting seat, a rotary base is rotatably connected in the mounting seat, the output shaft of the rotary cylinder is fixedly connected with the rotary base and drives the rotary base to flip up and down, the rotary base comprises a bottom plate and a pressing cylinder arranged on the bottom plate, and a gas pipe joint is arranged on the bottom plate. The exhaust valve detection method based on the exhaust valve detection device can continuously detect the air tightness and exhaust performance of the exhaust valve, and improves the detection efficiency and practicality.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of detection methods, and relates to an exhaust valve detection method based on an exhaust valve detection device. BACKGROUND

[0002] The exhaust valve is applied to pipeline exhaust of independent heating systems, central heating systems, heating boilers, central air conditioners, floor heating and solar heating systems. The principle of the exhaust valve is that when gas overflows in the system, the gas will climb up along the pipeline and finally gather at the highest point of the system, and the exhaust valve is generally installed at the highest point of the system. When the gas enters the valve cavity of the exhaust valve and gathers at the upper part of the exhaust valve, with the increase of the gas in the valve, the pressure rises. When the gas pressure is greater than the system pressure, the gas will make the water surface in the cavity drop, and the float will also drop with the water level to open the exhaust port. After the gas is exhausted, the water level rises, and the float also rises to close the exhaust port.

[0003] Therefore, the exhaust valve needs to be detected by a detection device before use. Usually, the exhaust performance and air pressure sealing performance of the exhaust valve need to be detected. For example, a gas tightness detection device for brass exhaust valves is disclosed in Chinese Patent Application No. 202420598695.7. The device comprises a gas source machine, an air pressure gauge, a cam divider, and a dividing disc. The dividing disc is installed on the output shaft of the cam divider. A ring of part clamping holes is arranged on the dividing disc around the output shaft. One of the part clamping holes is a detection position. A gas pump is arranged in the radial direction of the detection position and located outside the dividing disc. A plugging cylinder is arranged below the detection position. A plugging pipe is arranged at the front end of the cylinder shaft of the plugging cylinder. An air pressure gauge is arranged on the plugging pipe. A pressing cylinder is hung above the detection position. When the pressing cylinder is pressed, the front end of the cylinder shaft of the pressing cylinder acts on the brass exhaust valve in the part clamping hole. The gas pump is installed at the front end of the cylinder shaft of the moving cylinder, and the extending direction of the moving cylinder is opposite to the part clamping hole.

[0004] The above structure blocks the upper air port of the brass exhaust valve by the gas pump and blocks the lower air port of the brass exhaust valve by the pressing cylinder to inflate the brass exhaust valve and observe the change of the air pressure gauge to determine the gas tightness. The gas tightness detection needs to block the lower air port of the brass exhaust valve by the pressing cylinder, so that the gas tightness detection not only needs to inflate the entire brass exhaust valve by the gas pump, but also needs to block the brass exhaust valve by the pressing cylinder, resulting in low detection efficiency. Moreover, the detection device cannot detect the exhaust performance of the brass exhaust valve. SUMMARY

[0005] The application aims to solve the above problems of the existing technology and provides an exhaust valve detection method based on an exhaust valve detection device. The technical problem to be solved by the application is how to solve the problem that the existing brass exhaust valve can only be detected for gas tightness or exhaust performance and has low detection efficiency.

[0006] The object of the present application can be achieved by the following technical solutions:

[0007] An exhaust valve detection method based on an exhaust valve detection device, the detection device comprising a water tank, a lifting cylinder and a mounting seat are installed in the water tank, the lifting cylinder can drive the mounting seat to move vertically, a rotary cylinder is installed on the side wall of the mounting seat, a rotary base is rotationally connected in the mounting seat, the output shaft of the rotary cylinder is fixedly connected with the rotary base and drives the rotary base to flip up and down, the rotary base comprises a bottom plate and a pressing cylinder arranged on the bottom plate, a gas pipe joint is arranged on the bottom plate, a pressing plate arranged directly above the bottom plate is connected to the piston rod of the pressing cylinder, characterized in that the exhaust valve detection method comprises the following steps:

[0008] S1, assembly: place the exhaust valve vertically on the bottom plate of the rotary base, drive the pressing cylinder, the piston rod drives the pressing plate to move downward to press the exhaust valve on the bottom plate, and connect the gas pipe of the external air pump with the gas pipe joint;

[0009] S2, exhaust performance detection: inject water into the water tank, drive the lifting cylinder to drive the rotary base to move vertically until the exhaust valve on the rotary base is entirely located below the water surface, and the upper end of the exhaust valve is close to the water surface, drive the external air pump to pass compressed air with a pressure greater than 0.01 Mpa into the exhaust valve on the bottom plate, slowly increase the air pressure of the compressed air, and observe the escaping of air bubbles in the water;

[0010] S3, reversing: close the air pump, drive the rotary cylinder, the rotary cylinder drives the rotary base to rotate by 180°, the exhaust valve is set in an inverted position and the exhaust port of the exhaust valve is located below the water surface;

[0011] S4, air tightness performance detection: restart the air pump, first pass compressed air with a pressure of 0.01 Mpa to 0.03 Mpa into the exhaust valve on the bottom plate, last for at least 15 s, then increase the air pressure of the compressed air to 1.1 times to 1.2 times of the nominal pressure of the exhaust valve, last for at least 15 s, and observe the escaping of air bubbles in the water;

[0012] S5, discharging: close the air pump again, start the rotary cylinder, the rotary cylinder drives the rotary base to rotate reversely by 180°, start the lifting cylinder, the lifting cylinder drives the mounting seat to move upward until the exhaust valve floats on the water surface, then start the pressing cylinder, the piston rod of the pressing cylinder drives the pressing plate to move upward to separate the pressing plate from the upper end of the exhaust valve, and take out the exhaust valve from the bottom plate.

[0013] Before detection, the lower end of the exhaust valve is arranged in the bottom plate, the piston rod of the pressing cylinder is driven to drive the pressing plate to move downward, the pressing plate is pressed on the bottom plate to realize the fixation of the exhaust valve, water is injected into the water tank, the lifting cylinder is driven, the lifting cylinder drives the rotating base to move downward, so that the exhaust valve is located below the water surface, and at this time, the exhaust port of the exhaust valve is arranged close to the water surface, the exhaust performance test is first carried out, the compressed air with a pressure greater than 0.01 Mpa is introduced into the exhaust valve located in the bottom plate through the air pipe joint, and the pressure of the compressed air is slowly increased, whether air is continuously discharged at the exhaust port of the exhaust valve is observed, if the exhaust bubbles are interrupted for not more than 3s, the exhaust performance of the exhaust valve is qualified, if the exhaust bubbles are interrupted for more than 3s, the exhaust performance of the exhaust valve is unqualified, after the exhaust performance detection is completed, the compressed air filling of the air pump is stopped, since the exhaust port of the exhaust valve is arranged close to the water surface, the rotating base can be directly rotated by 180° through the rotating cylinder, so that the exhaust valve is inverted and the exhaust port is located below the water surface, the float of the exhaust valve also moves downward to block the exhaust port of the exhaust valve due to the inverted placement, since the air tightness detection is divided into low pressure sealing test and high pressure sealing test, the low pressure sealing test needs to be carried out first, the compressed air with a pressure of 0.01 Mpa to 0.03 Mpa is introduced into the exhaust valve in the bottom plate, and lasts for at least 15s, whether bubbles are emitted from the exhaust port is observed, if bubbles are emitted, it is unqualified, otherwise it is qualified, then the high pressure sealing test is carried out, the pressure of the compressed air is increased to 1.1 to 1.2 times of the nominal pressure of the exhaust valve, and lasts for at least 15s, whether bubbles are emitted from the exhaust port is observed, if bubbles are emitted, it is unqualified, otherwise it is qualified, after the detection is completed, the rotating base is reversely rotated by 180° through the rotating cylinder, the lifting cylinder is started, the lifting cylinder drives the mounting seat to move upward to make the exhaust valve float on the water surface, and then the pressing cylinder is started, the piston rod of the pressing cylinder drives the pressing plate to move upward to make the pressing plate separate from the upper end of the exhaust valve, and the exhaust valve is taken out from the bottom plate.

[0014] Since the exhaust valve needs to be subjected to exhaust performance detection and air tightness detection, the exhaust port of the exhaust valve is located below the water surface of the water tank, whether bubbles are emitted from the exhaust port is observed to observe the exhaust performance and air tightness, the detection is realized by setting the exhaust valve in a normal direction and inverting the exhaust valve, and the air tightness detection is directly realized by inverting the exhaust valve, the float in the exhaust valve falls downward under the action of its own gravity and blocks the exhaust port of the exhaust valve, so that the air tightness test can be carried out, usually, the cooperation of the rotating cylinder, the lifting cylinder and the pressing cylinder realizes the installation of the exhaust valve, the lifting and the upward and downward overturning after installation, the detection method can continuously detect the air tightness and the exhaust performance of the exhaust valve, and the detection of the two does not need to use two different detection devices and detection methods, so that the detection efficiency and practicability are improved.

[0015] The nominal pressure of the exhaust valve is the maximum pressure that the exhaust valve can safely withstand. After the production of the exhaust valve, the nominal pressure will be directly marked on the nameplate, such as PN16, which means that the exhaust valve needs to be less than 1.6Mpa in normal use. Therefore, in the above air tightness test, 17.6Mpa~19.2Mpa compressed gas needs to be applied to the exhaust valve to realize high pressure sealing detection of the exhaust valve. Because of the different use environment, the nominal pressure of the exhaust valve will also change, so the gas pressure of the compressed gas can be set to 1.1 times to 1.2 times of the nominal pressure of the exhaust valve itself during detection.

[0016] In the above exhaust valve detection method based on the exhaust valve detection device, in step S2, the gas pressure of the compressed air of the air pump slowly rises from 0.01Mpa to 0.6Mpa, and lasts for more than 60s.

[0017] The exhaust performance detection needs to test the exhaust performance under different gas pressures. In order to further ensure the accuracy of the detection, the gas pressure of the compressed air is slowly raised, so as to facilitate the detection of the exhaust performance of the exhaust valve under different gas pressures, and the detection accuracy is improved while the detection efficiency is ensured.

[0018] In the above exhaust valve detection method based on the exhaust valve detection device, in step S1, the exhaust port of the exhaust valve is arranged forward, and the air pipe joint is arranged backward.

[0019] By staggering the exhaust port of the exhaust valve and the air pipe joint, the water pipe connected to the air pipe joint will not affect the exhaust port of the exhaust valve during the rotation of the cylinder, thereby ensuring the detection accuracy.

[0020] In the above exhaust valve detection method based on the exhaust valve detection device, the detection device further comprises a timer, an electromagnetic valve and a control circuit board. In step S1, the timer, the electromagnetic valve and the control circuit board are arranged at the air outlet end of the air pump. The timer is electrically connected with the control circuit board and sends a timing end signal to the control circuit board. After processing the signal, the control circuit board controls the electromagnetic valve to open or close the air outlet end of the air pump.

[0021] Through the cooperation of the timer, the electromagnetic valve and the control circuit board, not only the detection time can be controlled, but also the on-off of the air outlet end of the air pump can be realized, thereby making it more convenient for the staff to set during detection, and further improving the detection efficiency.

[0022] In the above exhaust valve detection method based on the exhaust valve detection device, in step S2, when the unqualified observation is started, the lifting cylinder is started to expose the exhaust valve of the rotary base to the water surface, the pressing cylinder is driven to lift the pressing plate upward, the original exhaust valve can be taken out from between the bottom plate and the pressing plate, and then the pressing cylinder is driven to reset the pressing plate.

[0023] In the exhaust valve performance detection, when the detection is unqualified, the lifting cylinder can be directly started to expose the exhaust valve of the rotating base above the water surface, and then the pressing plate of the pressing cylinder is driven to be lifted upward to take out the unqualified exhaust valve, and then the pressing cylinder is driven to reset the pressing plate, so that the unqualified exhaust valve can be quickly taken out, and the subsequent detection is not affected.

[0024] In the exhaust valve detection method based on the exhaust valve detection device, in step S4, the timer monitors that the compressed air with a pressure of 0.01-0.03 MPa is supplied into the exhaust valve of the bottom plate for 15 s, and then sends a signal to the control circuit board of the electromagnetic valve. After processing the signal, the control circuit board controls the electromagnetic valve to quickly increase the pressure of the compressed air to 1.1 times of the nominal pressure of the exhaust valve.

[0025] Since the air tightness detection is divided into low pressure sealing test and high pressure sealing test, the air pressure does not need to be slowly increased, but can be directly increased, and then the detection can be directly performed for more than 15 s, so that the air tightness of the exhaust valve can be quickly judged, and the detection efficiency is improved.

[0026] In the exhaust valve detection method based on the exhaust valve detection device, in step S1, the bottom plate is provided with a limiting groove into which the lower end of the exhaust valve is inserted, and the air pipe joint is in communication with the limiting groove.

[0027] The limiting groove is arranged to stably arrange the lower end of the exhaust valve in the limiting groove of the bottom plate, so that the air pipe joint can stably guide the compressed gas into the exhaust valve through the limiting groove, improve the sealing effect, and ensure the accuracy of the detection method.

[0028] In the exhaust valve detection method based on the exhaust valve detection device, in step S1, the two ends of the pressing plate are provided with U-shaped pressing portions, and the pressing cylinder drives the pressing plate to press the two fork arms of the pressing portions on the front and rear sides of the upper end surface of the corresponding exhaust valve of the bottom plate.

[0029] Since the exhaust valve needs to be continuously supplied with compressed gas during the experiment, the exhaust valve will have a slight upward displacement after the gas is supplied. The shape of the pressing portion has a hollow groove, so that when the exhaust valve has a tendency to move upward, the pressing portion will not move upward with the exhaust valve as a whole, but will adaptively fit on the upper end of the exhaust valve, so that the exhaust valve can stably perform the experiment, the lower end of the exhaust valve will not leak during the experiment, and the accuracy of the detection method is improved.

[0030] In the exhaust valve detection method based on the exhaust valve detection device, the detection device further comprises a limiting rod fixed on the rotating base, the pressing plate is in the shape of a Chinese character "N", a limiting hole is formed in the middle of the pressing plate, and the limiting rod slides relative to the hole wall of the limiting hole when the pressing plate vertically moves in steps S1 and S5.

[0031] By designing the pressing plate in the shape of a Chinese character "N", cooperating with the limiting rod and the limiting hole, the middle part of the pressing plate is guided, the vertical displacement deviation of the pressing plate is avoided, the upward and downward inclination is also avoided, the pressing effect is better, the upper ends of the two exhaust valves are pressed, the two exhaust valves can balance each other, when one of the exhaust valves has an upward trend, the other end of the pressing plate swings downward to press the other exhaust valve, so that the reaction force acts on the pressing plate under the resistance of the other exhaust valve, the pressing effect of the pressing plate is enhanced, and the detection accuracy of the detection method is improved.

[0032] Compared with the prior art, the exhaust valve detection device has the following advantages:

[0033] 1. Since the exhaust valve needs to be detected in terms of exhaust performance and air tightness, the exhaust port of the exhaust valve is located below the water surface of the water tank, and whether there is air bubble in the exhaust port is observed to observe the exhaust performance and air tightness. The detection is realized by setting the exhaust valve in a forward direction and inverting it, and the air tightness detection is directly realized by inverting the exhaust valve, the float in the exhaust valve falls downward under its own gravity, and the exhaust port of the exhaust valve is blocked, so that the air tightness experiment can be performed. The cooperation of the above-mentioned rotary cylinder, lifting cylinder and pressing cylinder realizes the installation of the exhaust valve, the lifting and upward and downward inversion after installation. The detection method can continuously detect the air tightness and exhaust performance of the exhaust valve, and does not need to use two different detection devices and detection methods to detect the air tightness and exhaust performance, thereby improving the detection efficiency and practicality.

[0034] 2. Since the air tightness detection is divided into low-pressure sealing test and high-pressure sealing test, the air pressure does not need to be slowly increased, but can be directly increased, and the detection of 15 s or more can be directly performed, so that the air tightness of the exhaust valve can be more quickly judged, and the detection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is the initial structure diagram of the exhaust valve after installation.

[0036] Figure 2 is the structure diagram of the exhaust valve for exhaust performance test.

[0037] Figure 3 is the structure diagram of the exhaust valve for air tightness test.

[0038] Figure 4is a partial assembly diagram of the initial state of the exhaust valve.

[0039] Figure 5 is a partial structure diagram of the exhaust valve upside down.

[0040] In the figure, 1, water tank; 11, guide rod; 2, lifting cylinder; 3, mounting seat; 4, rotary cylinder; 5, rotary base; 51, bottom plate; 51a, air pipe joint; 51b, limiting groove; 52, limiting rod; 6, compression cylinder; 61, piston rod; 7, compression plate; 71, compression part; 71a, fork arm; 72, limiting hole; 8, exhaust valve; 81, exhaust port. DETAILED DESCRIPTION

[0041] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0042] As shown in Figure 1 and Figure 4 , the exhaust valve detection method based on the exhaust valve detection device, the detection device includes a water tank 1, the water tank 1 is provided with a lifting cylinder 2 and a mounting seat 3, the lifting cylinder 2 can drive the mounting seat 3 to move vertically, the water tank 1 is fixed with a guide rod 11, the mounting seat 3 moves vertically along the guide rod 11, the mounting seat 3 is provided with a rotary cylinder 4 on the side wall, the mounting seat 3 is rotatably connected with a rotary base 5, the output shaft of the rotary cylinder 4 is fixedly connected with the rotary base 5 and drives the rotary base 5 to flip up and down, the rotary base 5 includes a bottom plate 51 and a compression cylinder 6 arranged on the bottom plate 51, the bottom plate 51 is provided with an air pipe joint 51a, the compression cylinder 6 is connected with a compression plate 7 arranged directly above the bottom plate 51, the detection device further includes a timer, a solenoid valve and a control circuit board.

[0043] Specifically, as shown in Figures 1-5 , the exhaust valve detection method includes the following steps:

[0044] S1, assembly: place the exhaust valve 8 in the forward direction on the bottom plate 51 of the rotary base 5, drive the compression cylinder 6, the bottom plate 51 is provided with a limiting groove 51b for embedding the lower end of the exhaust valve 8, the air pipe joint 51a is in communication with the limiting groove 51b, the two ends of the compression plate 7 are provided with a U-shaped compression part 71, the compression cylinder 6 drives the piston rod 61 to drive the compression plate 7 to press the two fork arms 71a of the compression part 71 on the front and back sides of the upper end surface of the corresponding exhaust valve 8 of the bottom plate 51, press the lower end of the exhaust valve 8 into the limiting groove 51b of the bottom plate 51, connect the air pipe of the external air pump with the air pipe joint 51a, the exhaust port 81 of the exhaust valve 8 is arranged forward, and the air pipe joint 51a is arranged backward;

[0045] The timer, the electromagnetic valve and the control circuit board are arranged at the air outlet end of the air pump, the timer is electrically connected with the control circuit board and sends a timing end signal to the control circuit board, and the control circuit board controls the electromagnetic valve to open or close the air outlet end of the air pump after processing the signal;

[0046] S2, exhaust performance detection: water is injected into the water tank 1, the lifting cylinder 2 is driven to drive the rotating base 5 to move vertically, the exhaust valve 8 on the rotating base 5 is located entirely below the water surface, and the upper end of the exhaust valve 8 is close to the water surface, the external air pump is driven, and compressed air is introduced into the exhaust valve 8 of the bottom plate 51, the air pressure of the compressed air of the external air pump slowly rises from 0.01Mpa to 0.6Mpa, and lasts for more than 60s, and the water bubble escaping condition is observed;

[0047] When the observation is unqualified, the lifting cylinder 2 is started, the exhaust valve 8 of the rotating base 5 is exposed to the water surface, the pressing cylinder 6 is driven to lift the pressing plate 7 upward, the original exhaust valve 8 can be taken out from between the bottom plate 51 and the pressing plate 7, and then the pressing cylinder 6 is driven to reset the pressing plate 7;

[0048] S3, reversing: the external air pump is closed, the rotating cylinder 4 is driven, the rotating cylinder 4 drives the rotating base 5 to rotate 180°, the exhaust valve 8 is set in an inverted position, and the exhaust port 81 of the exhaust valve 8 is located below the water surface;

[0049] S4, air tightness detection: the external air pump is restarted, first, the compressed air with the air pressure of 0.01Mpa-0.03Mpa is introduced into the exhaust valve 8 of the bottom plate 51, and lasts for at least 15s, then the air pressure of the compressed air is increased to 1.1-1.2 times of the nominal pressure of the exhaust valve 8, and lasts for at least 15s, specifically, the timer sends a signal to the control circuit board of the electromagnetic valve after the compressed air with the air pressure of 0.01Mpa-0.03Mpa is introduced into the exhaust valve 8 of the bottom plate 51 for 15s, and the control circuit board controls the air pressure of the compressed air to rise from 0.02Mpa to 1.1 times of the nominal pressure of the exhaust valve 8 after processing the signal;

[0050] S5, discharging: the external air pump is closed again, the driving cylinder is started, the rotating cylinder 4 drives the rotating base 5 to rotate 180° in the opposite direction, the lifting cylinder 2 is started, the lifting cylinder 2 drives the mounting seat 3 to move upward to make the exhaust valve 8 float out of the water surface, and then the pressing cylinder 6 is started, the piston rod 61 of the pressing cylinder 6 drives the pressing plate 7 to move upward to make the pressing plate 7 separate from the upper end of the exhaust valve 8, and the exhaust valve 8 is taken out from the bottom plate 51.

[0051] Further, as Figure 4 and Figure 5As shown, the detection device further comprises a limiting rod 52 fixed on the rotating base 5, the pressing plate 7 is in the shape of Chinese character "N", and a limiting hole 72 is formed in the middle of the pressing plate 7. In steps S1 and S5, the limiting rod 52 slides relative to the hole wall of the limiting hole 72 when the pressing plate 7 moves vertically.

[0052] Before detection, the lower end of the exhaust valve 8 is arranged in the bottom plate 51, the piston rod 61 of the pressing cylinder 6 is driven to drive the pressing plate 7 to move downward, the pressing plate 7 presses the exhaust valve 8 on the bottom plate 51, the fixation of the exhaust valve 8 is realized, water is injected into the water tank 1, the lifting cylinder 2 is driven, the lifting cylinder 2 drives the rotating base 5 to move downward, the exhaust valve 8 is located entirely below the water surface, and at this time, the exhaust port 81 of the exhaust valve 8 is arranged close to the water surface, the exhaust performance test is first performed, the compressed air with air pressure greater than 0.01 Mpa is introduced into the exhaust valve 8 located in the bottom plate 51 from the air pipe joint 51a, and the pressure of the compressed air is slowly increased, whether air is continuously discharged at the exhaust port 81 of the exhaust valve 8 is observed, if the exhaust bubbles are interrupted for no more than 3 s, the exhaust performance of the exhaust valve 8 is qualified, if the exhaust bubbles are interrupted for more than 3 s, the exhaust performance of the exhaust valve 8 is unqualified, after the exhaust performance test is completed, the filling of the compressed air by the air pump is stopped, because the exhaust port 81 of the exhaust valve 8 is arranged close to the water surface, the rotating base 5 can be directly rotated by 180° by the rotating cylinder 4, the exhaust valve 8 is inverted, and the exhaust port 81 is located below the water surface, the float of the exhaust valve 8 also moves downward to block the exhaust port 81 of the exhaust valve 8 due to the inverted placement, because the air tightness detection is divided into low-pressure sealing test and high-pressure sealing test, the low-pressure sealing test needs to be performed first, the compressed air with pressure of 0.01 Mpa to 0.03 Mpa is introduced into the exhaust valve 8 of the bottom plate 51, and lasts for at least 15 s, whether bubbles are emitted from the exhaust port 81 is observed, if bubbles are emitted, it is unqualified, otherwise it is qualified, the high-pressure sealing test is performed, the air pressure of the compressed air is increased to 1.1 times to 1.2 times of the nominal pressure of the exhaust valve 8, lasts for at least 15 s, whether bubbles are emitted from the exhaust port 81 is observed, if bubbles are emitted, it is unqualified, otherwise it is qualified, after the detection is completed, the rotating base 5 is reversely rotated by 180° by the rotating cylinder 4, the lifting cylinder 2 is started, the lifting cylinder 2 drives the mounting seat 3 to move upward to make the exhaust valve 8 float on the water surface, the pressing cylinder 6 is started, the piston rod 61 of the pressing cylinder 6 drives the pressing plate 7 to move upward to make the pressing plate 7 separate from the upper end of the exhaust valve 8, and the exhaust valve 8 is taken out from the bottom plate 51.

[0053] Since the exhaust valve 8 needs to be subjected to exhaust performance detection and air tightness detection, the exhaust port 81 of the exhaust valve 8 is located below the water surface of the water tank 1, and whether there is air bubble in the exhaust port 81 is observed to observe the exhaust performance and air tightness. The detection is realized by setting the exhaust valve 8 in a normal direction and inverting it. The air tightness detection is directly realized by inverting the exhaust valve 8. The float in the exhaust valve 8 falls downward under its own gravity and blocks the exhaust port 81 of the exhaust valve 8, so that the air tightness experiment can be carried out. Usually, the cooperation of the above-mentioned rotating cylinder 4, lifting cylinder 2 and pressing cylinder 6 realizes the installation of the exhaust valve 8, as well as the lifting and up-down overturning after installation. The detection method can continuously detect the air tightness and exhaust performance of the exhaust valve 8, and does not need to use two different detection devices and detection methods to detect the air tightness and exhaust performance, which improves the detection efficiency and practicability.

[0054] The specific embodiments described herein are merely illustrative of the principles of this application. Numerous modifications and adaptations will be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the appended claims.

Claims

1. A method for detecting an exhaust valve based on an exhaust valve detection device, the detection device comprising a water tank (1), wherein a lifting cylinder (2) and a mounting base (3) are installed in the water tank (1), the lifting cylinder (2) can drive the mounting base (3) to move vertically, a rotating cylinder (4) is installed on the side wall of the mounting base (3), a rotating base (5) is rotatably connected in the mounting base (3), the output shaft of the rotating cylinder (4) is fixedly connected to the rotating base (5) and drives the rotating base (5) to rotate up and down, the rotating base (5) comprises a base plate (51) and a pressing cylinder (6) disposed on the base plate (51), a pipe connector (51a) is provided on the base plate (51), and a pressing plate (7) disposed directly above the base plate (51) is connected to the piston rod (61) of the pressing cylinder (6), characterized in that, This exhaust valve testing method includes the following steps: S1. Assembly: Both ends of the clamping plate (7) have U-shaped clamping parts (71). The clamping cylinder (6) drives the clamping plate (7) downward to press the two forks (71a) of the clamping part (71) against the front and rear sides of the upper end face of the corresponding exhaust valve (8) of the base plate (51). The two clamping parts (71) of the clamping plate (7) are located above the two adjacent base plates (51) and simultaneously press the two exhaust valves (8). When one of the exhaust valves (8) has an upward tendency, the clamping plate (7) on the other exhaust valve (8) swings downward and presses the exhaust valve (8) against the resistance of the other exhaust valve (8). A reaction force acts on the pressing plate (7). The detection device also includes a limiting rod (52) fixed on the rotating base (5). The pressing plate (7) is convex in shape. A limiting hole (72) is opened in the middle of the pressing plate (7). The exhaust valve (8) is placed on the bottom plate (51) of the rotating base (5) in the forward direction. The pressing cylinder (6) is driven. When the pressing plate (7) moves vertically, the limiting rod (52) slides relative to the hole wall of the limiting hole (72). The piston rod (61) drives the pressing plate (7) to move downward to press the exhaust valve (8) on the bottom plate (51). The air pipe of the external air pump is connected to the air pipe connector (51a). S2, Exhaust performance test: Water is injected into the water tank (1), and the lifting cylinder (2) is driven to move the rotating base (5) vertically until the exhaust valve (8) on the rotating base (5) is completely below the water surface and the upper end of the exhaust valve (8) is close to the water surface. The external air pump is driven to introduce compressed air with a pressure greater than 0.01 MPa into the exhaust valve (8) on the bottom plate (51), and the pressure of the compressed air is slowly increased. The situation of air bubbles escaping from the water is observed. S3, Reversal: Turn off the air pump and drive the rotary cylinder (4). The rotary cylinder (4) drives the rotary base (5) to rotate 180°. The exhaust valve (8) is set up upside down and the exhaust port (81) of the exhaust valve (8) is located below the water surface. S4. Air tightness test: Restart the air pump and first introduce compressed air with a pressure of 0.01Mpa to 0.03Mpa into the exhaust valve (8) on the bottom plate (51) for at least 15s. Then increase the pressure of the compressed air to 1.1 to 1.2 times the nominal pressure of the exhaust valve (8) itself for at least 15s and observe the escape of air bubbles in the water. S5, Unloading: Turn off the air pump again, start the rotary cylinder (4), the rotary cylinder (4) drives the rotary base (5) to rotate 180° in the opposite direction, start the lifting cylinder (2), the lifting cylinder (2) drives the mounting seat (3) to move up until the exhaust valve (8) floats out of the water, then start the clamping cylinder (6), the piston rod (61) of the clamping cylinder (6) drives the clamping plate (7) to move upward so that the clamping plate (7) is separated from the upper end of the exhaust valve (8). When the clamping plate (7) moves vertically, the limiting rod (52) slides relative to the hole wall of the limiting hole (72) to remove the exhaust valve (8) from the bottom plate (51).

2. The exhaust valve detection method based on the exhaust valve detection device according to claim 1, characterized in that, In step S2, the compressed air pressure of the air pump slowly increases from 0.01 MPa to 0.6 MPa and continues for more than 60 seconds.

3. The exhaust valve detection method based on the exhaust valve detection device according to claim 1 or 2, characterized in that, In step S1, the exhaust port (81) of the exhaust valve (8) is positioned facing forward, and the air pipe connector (51a) is positioned facing backward.

4. The exhaust valve detection method based on the exhaust valve detection device according to claim 1 or 2, characterized in that, The detection device also includes a timer, a solenoid valve, and a control circuit board. In step S1, the timer, solenoid valve, and control circuit board are installed at the outlet of the air pump. The timer is electrically connected to the control circuit board and sends a timing end signal to it. After processing the signal, the control circuit board controls the solenoid valve to open or close the outlet of the air pump.

5. The exhaust valve detection method based on the exhaust valve detection device according to claim 4, characterized in that, Between steps S2 and S3, if the observation is not qualified, start the lifting cylinder (2) to expose the exhaust valve (8) of the rotating base (5) above the water surface, drive the pressing cylinder (6) to lift the pressing plate (7) upward, so that the original exhaust valve (8) can be removed from between the base plate (51) and the pressing plate (7), and then drive the pressing cylinder (6) to reset the pressing plate (7).

6. The exhaust valve detection method based on the exhaust valve detection device according to claim 4, characterized in that, In step S4, the timer detects that compressed air with a pressure of 0.01 MPa to 0.03 MPa has been introduced into the exhaust valve (8) of the bottom plate (51) for 15 seconds and then sends a signal to the control circuit board of the solenoid valve. After processing the signal, the control circuit board controls the compressed air pressure of 0.02 MPa to rise rapidly to 1.1 times the nominal pressure of the exhaust valve (8).

7. The exhaust valve detection method based on the exhaust valve detection device according to claim 1 or 2, characterized in that, In step S1, a limiting groove (51b) is provided on the base plate (51) for the lower end of the exhaust valve (8) to be embedded, and the air pipe connector (51a) is connected to the limiting groove (51b).

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