Pipeline transmission valve and pipeline leakage automatic detection system and leakage detection method

Abstract

The present invention discloses a pipeline conveying valve and pipeline leakage automatic detection system and a leakage detection method, including a hot water bucket, a dye storage bucket, a coloring tank, a two-way valve, a three-way valve, a pressure sensor and a gas storage tank, the gas storage tank is connected to the inlet of the tenth two-way valve, the outlet of the tenth two-way valve is connected to the inlet of the third two-way valve, the outlet of the third two-way valve is connected to the third port of the first three-way valve, a first pressure sensor is arranged between the third two-way valve and the first three-way valve, the outlet of the tenth two-way valve is connected to the inlet of the fourth two-way valve, the outlet of the fourth two-way valve is connected to the third port of the fifth three-way valve, and a second pressure sensor is arranged between the fourth two-way valve and the fifth three-way valve. Based on the above system, the present invention also discloses a leakage detection method. The system is easy to deploy, easy to detect, has a good detection effect, and the leakage detection method is simple to operate and has high detection efficiency.

Description

Technical Field

[0001] The invention relates to a pipeline transportation system, in particular to a pipeline transportation valve and a pipeline leakage automatic detection system and a leakage detection method. Background Art

[0002] As we all know, dyeing factories use pipelines to automatically transport a variety of dyes and chemicals to multiple dyeing machine color tanks for large-scale production. In this pipeline feeding system, a three-way valve is needed to control the flow direction of the medium in the entire pipeline. Due to the high work intensity, the valve core and sealing ring of the three-way valve will be worn. When the cumulative wear reaches a certain amount and the sealing ring cannot compensate for the gap caused by wear, the valve will leak. When the dyes and chemicals are transported, it will cause mixing between different dyes and chemicals, which will reduce the dyeing quality of the fabric and cause unqualified dyeing. In addition, there are many valves in the dyeing and chemical delivery system, and leakage is not easy to be found. Usually, the problem is discovered after the entire system has completed more than a dozen tanks. At this time, the losses caused by dyeing scrap and shutdown are huge.

[0003] At present, there are passive leak detection methods, audio-audio leak detection methods, and related leak detection methods for dye and chemical material conveying pipelines. In general, the above leak detection methods are costly, have low leak detection efficiency, poor positioning accuracy, high labor intensity, and complex installation. Specifically, the passive detection method can only be used when an obvious leak occurs. By the time the leak is obvious, the dye and chemical material has been seriously lost; the audio-audio leak detection method and the related leak detection method both use acoustic principles. Both methods require a complete set of listening systems, which are costly, inconvenient to deploy, complex to install, and cumbersome to detect. In addition, after practice, in the working environment of the dyeing factory, the leak detection effect is not ideal and the positioning accuracy is low; the related leak detection method requires a special listening instrument with a high-sensitivity sensor. Due to the large number of valves in the dyeing factory's dye and chemical conveying system, the high-sensitivity sensor is easily damaged and the maintenance cost is high. Summary of the invention

[0004] The purpose of the present invention is to provide a pipeline conveying valve and pipeline leakage automatic detection system and leakage detection method, which solves the problems of difficult deployment, complex installation, high purchase and maintenance costs, low detection efficiency, low positioning accuracy, high labor intensity and cumbersome detection methods of the leakage detection system.

[0005] In order to achieve the above technical objectives and meet the above technical requirements, the technical solution adopted by the present invention is: a pipeline delivery valve and pipeline leakage automatic detection system, including a hot water bucket, a dye storage bucket, a coloring cylinder, a two-way valve, a three-way valve, a pressure sensor and a gas storage tank, the hot water bucket is connected to the inlet of the first two-way valve, the outlet of the first two-way valve is connected to the inlet of the transparent device, the outlet of the transparent device is connected to a port of the first three-way valve, the other port of the first three-way valve is connected to a port of the second three-way valve, the other port of the second three-way valve is connected to the inlet of the second two-way valve, the outlet of the second two-way valve is connected to the inlet of the pump, the outlet of the pump is connected to the inlet of the flow meter, the outlet of the flow meter is connected to a port of the fifth three-way valve, the other port of the fifth three-way valve is connected to a port of the sixth three-way valve, the other port of the sixth three-way valve is connected to the inlet of the fifth two-way valve, and the outlet of the fifth two-way valve is connected to the third coloring cylinder;

[0006] The first dye storage barrel is connected to the inlet of the seventh two-way valve, the outlet of the seventh two-way valve is connected to the inlet of the transparent device, the outlet of the transparent device is connected to the third port of the second three-way valve, and the third port of the sixth three-way valve is connected to the first color-changing cylinder;

[0007] The gas storage tank is connected to the inlet of the tenth two-way valve, the outlet of the tenth two-way valve is connected to the inlet of the third two-way valve, the outlet of the third two-way valve is connected to the third port of the first three-way valve, and a first pressure sensor is arranged between the third two-way valve and the first three-way valve;

[0008] The outlet of the tenth two-way valve is connected to the inlet of the fourth two-way valve, the outlet of the fourth two-way valve is connected to the third port of the fifth three-way valve, and a second pressure sensor is arranged between the fourth two-way valve and the fifth three-way valve.

[0009] As a preferred technical solution: a third three-way valve and a fourth three-way valve are connected in sequence between the second three-way valve and the second two-way valve, one port of the third three-way valve is connected to one port of the second two-way valve, another port of the third three-way valve is connected to one port of the fourth three-way valve, another port of the fourth three-way valve is connected to the inlet of the second two-way valve, the second dye storage barrel is connected to the inlet of the eighth two-way valve, the outlet of the eighth two-way valve is connected to the inlet of the transparent device, the outlet of the transparent device is connected to the third port of the third three-way valve, the third dye storage barrel is connected to the inlet of the ninth two-way valve, the outlet of the ninth two-way valve is connected to the inlet of the transparent device, and the outlet of the transparent device is connected to the third port of the fourth three-way valve;

[0010] A seventh three-way valve is also connected between the sixth three-way valve and the fifth two-way valve, one port of the sixth three-way valve is connected to one port of the seventh three-way valve, another port of the seventh three-way valve is connected to the inlet of the fifth two-way valve, and the third port of the seventh three-way valve is connected to the second color-changing cylinder.

[0011] As a preferred technical solution: the transparent device is a transparent pipe.

[0012] As a preferred technical solution: the three-way valve is a pneumatic T-type three-way ball valve.

[0013] In order to solve the above technical problems, the present invention provides a leak detection method, comprising the following steps:

[0014] S1: The pipeline delivery valve and pipeline leakage automatic detection system are controlled by an electronic computer system. Before the detection, the third two-way valve and the fourth two-way valve are in a closed state, and the other valves are in an open state. When the entire system does not need to transport the medium and enters an idle period, the electronic computer system control components enter an automatic detection state;

[0015] S2: The electronic computer system controls the pump to deliver the hot water in the hot water bucket to the entire pipeline until it is full. The electronic computer system sets the flow meter parameters to determine whether the water in the delivery pipeline is full.

[0016] S3: After the entire pipeline is filled with water, the electronic computer system controls the pump to stop running and closes the second two-way valve and the fifth two-way valve;

[0017] S4: The electronic computer system opens the fourth two-way valve and the air storage tank, and switches the fifth three-way valve to allow the compressed air in the air storage tank to enter the delivery pipeline and pressurize the delivery pipeline;

[0018] S5: When the pressure value displayed by the second pressure sensor remains unchanged, the electronic computer system closes the fourth two-way valve;

[0019] S6: Maintain the pressure value for 5-10 minutes. If the pressure displayed by the second pressure sensor drops, the electronic computer system will issue an alarm signal;

[0020] S7: If an alarm is sounded, the operator checks whether there is water dripping in the color-changing tank. The corresponding valve of the color-changing tank with water dripping is repaired or replaced in time. If there is no water dripping but the alarm is still sounded, the operator checks whether there is leakage in the pipeline. If there is no alarm, the system is normal.

[0021] S8: After the system in step S7 operates normally, the electronic computer system closes the port of the three-way valve connected to the dye storage barrel, opens the third two-way valve, switches the first three-way valve to allow the compressed air in the air storage tank to enter the pipeline, and blows the water in the pipeline into the dyeing tank;

[0022] S9: The electronic computer system closes the first two-way valve and the second two-way valve;

[0023] S10: When the pressure value of the first pressure sensor reaches the maximum and does not rise any more, the electronic computer system closes the third two-way valve;

[0024] S11: Within 5-10 minutes, if the pressure displayed by the first pressure sensor drops, the electronic computer system will send out an alarm signal;

[0025] S12: If an alarm signal is issued, the operator checks whether there are bubbles from bottom to top in the transparent device. The three-way valve corresponding to the transparent device with bubbles from bottom to top needs to be replaced or repaired. If there are no bubbles from top to bottom in the transparent device and the system still alarms, the pipeline is leaking, and the operator checks whether the pipeline is leaking.

[0026] The beneficial effects of the present invention are: 1) the automatic detection system of the present invention is simple to operate, easy to deploy, and easy to detect; 2) the detection is easy to observe, the leakage component is located quickly, and the detection efficiency is high; 3) the components in the leakage detection system are all commonly used components, with low cost and easy installation; 4) the detection method is simple, the principle is easy to understand, and it will not cause operational obstacles. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a system diagram of the present invention;

[0028] Figure 2 This is a preferred system diagram of the present invention.

[0029] exist Figure 1-2 A. hot water barrel, B1. first dye storage barrel, B2. second dye storage barrel, B3. third dye storage barrel, C1. first color cylinder, C2. second color cylinder, C3. third color cylinder, D1. first two-way valve, D2. second two-way valve, D3. third two-way valve, D4. fourth two-way valve, D5. fifth two-way valve, D6. sixth two-way valve, D7. seventh two-way valve, D8. eighth two-way valve, D9. ninth two-way valve, D10. tenth two-way valve, E1. first three-way valve, E2. second three-way valve, E3. third three-way valve, E4. fourth three-way valve, E5. fifth three-way valve, E6. sixth three-way valve, E7. seventh three-way valve, F. transparent device, G. pump, H. flow meter, I. gas tank, P1. first pressure sensor, P2. second pressure sensor. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with the accompanying drawings;

[0031] Please refer to Figure 1-2, a pipeline conveying valve and pipeline leakage automatic detection system, including a hot water bucket A, a dye storage bucket, a coloring cylinder, a two-way valve, a three-way valve, a pressure sensor and an air storage tank I, the hot water bucket A is connected to the inlet of a first pneumatic two-way valve D1, the outlet of the first pneumatic two-way valve D1 is connected to the inlet of a transparent device F, the outlet of the transparent device F is connected to a port of a first three-way valve E1, the other port of the first three-way valve E1 is connected to a port of a second three-way valve E2, the other port of the second three-way valve E2 is connected to the inlet of a second pneumatic two-way valve D2, the outlet of the second pneumatic two-way valve D2 is connected to the inlet of a pump G, the outlet of the pump G is connected to the inlet of a flow meter H, the outlet of the flow meter H is connected to a port of a fifth three-way valve E5, the other port of the fifth three-way valve E5 is connected to a port of a sixth three-way valve E6, the other port of the sixth three-way valve E6 is connected to the inlet of a fifth pneumatic two-way valve D5, and the outlet of the fifth pneumatic two-way valve D5 is connected to a third coloring cylinder C3;

[0032] The first dye storage barrel B1 is connected to the inlet of the seventh manual two-way valve D7, the outlet of the seventh manual two-way valve D7 is connected to the inlet of the transparent device F, the outlet of the transparent device F is connected to the third port of the second three-way valve E2, and the third port of the sixth three-way valve E6 is connected to the first dyeing cylinder C1. The above is part of the system of the present invention, which is a pipeline transportation system;

[0033] The gas storage tank I is connected to the inlet of the tenth manual two-way valve D10, the outlet of the tenth manual two-way valve D10 is connected to the inlet of the third pneumatic two-way valve D3, the outlet of the third pneumatic two-way valve D3 is connected to the third port of the first three-way valve E1, a first pressure sensor P1 is arranged between the third pneumatic two-way valve D3 and the first three-way valve E1, the outlet of the tenth manual two-way valve D10 is connected to the inlet of the fourth pneumatic two-way valve D4, the outlet of the fourth pneumatic two-way valve D4 is connected to the third port of the fifth three-way valve E5, a second pressure sensor P2 is arranged between the fourth pneumatic two-way valve D4 and the fifth three-way valve E5, and only six to ten additional pressure sensors need to be added to the pipeline transportation system. The components are common components with low cost; the connection principle is also relatively simple, easy to deploy and install; the third pneumatic two-way valve D3, the fourth pneumatic two-way valve D4, the tenth manual two-way valve D10, the first pressure sensor P1 and the second pressure sensor P2 are not easy to wear out, and even if they need to be repaired, it is convenient and the maintenance cost is low. The pressure sensor is used to test the pressure in the pipeline to detect whether the pipeline and valve are leaking. The detection principle is simple and easy to operate, and only a few operations by the operator are required to complete the leak detection of the pipeline and valve; by observing the transparent device F and the pipe mouth entering the color tank, it is possible to determine which valve is leaking, with accurate positioning and high detection efficiency.

[0034] like Figure 1-2As shown, a third three-way valve E3 and a fourth three-way valve E4 are sequentially connected between the second three-way valve E2 and the second pneumatic two-way valve D2, one port of the third three-way valve E3 is connected to a port of the second two-way valve E2, another port of the third three-way valve E3 is connected to a port of the fourth three-way valve E4, another port of the fourth three-way valve E4 is connected to the inlet of the second pneumatic two-way valve D2, the second dye storage barrel B2 is connected to the inlet of the eighth manual two-way valve D8, the outlet of the eighth manual two-way valve D8 is connected to the inlet of the transparent device F, the outlet of the transparent device F is connected to the third port of the third three-way valve E3, the third dye storage barrel B3 is connected to the inlet of the ninth manual two-way valve D9, the outlet of the ninth manual two-way valve D9 is connected to the inlet of the transparent device F, and the outlet of the transparent device F is connected to the third port of the fourth three-way valve E4;

[0035] A seventh three-way valve E7 is also connected between the sixth three-way valve E6 and the fifth pneumatic two-way valve D5, one port of the sixth three-way valve E6 is connected to a port of the seventh three-way valve E7, another port of the seventh three-way valve E7 is connected to the inlet of the fifth pneumatic two-way valve D5, and the third port of the seventh three-way valve E7 is connected to the second color-changing cylinder C2. Due to the diversity of dyeing, a pipeline transportation system of a general dyeing factory will include multiple dye storage barrels and multiple color-changing cylinders. Adding dye storage barrels and color-changing cylinders will correspondingly increase valves. No matter how many valves are added, the pipeline transportation valve, pipeline leakage automatic detection system and leakage detection method described in the present invention remain unchanged, and the valve leakage point can still be detected quickly and accurately.

[0036] like Figure 1-2 As shown, the transparent device F is a transparent pipe, and the transparent pipe structure is simple and practical.

[0037] like Figure 1-2 As shown, the three-way valve is a pneumatic T-type three-way ball valve, which is lightweight, easy to maintain, has low resistance, and is sensitive to response. The three ports can be interconnected and are suitable for automation systems.

[0038] See also Figure 1-2 , a leak detection method, comprising the following steps:

[0039] S1: The pipeline delivery valve and pipeline leakage automatic detection system are controlled by an electronic computer system. Before the detection, the third pneumatic two-way valve D3 and the fourth pneumatic two-way valve D4 are in a closed state, and the other valves are in an open state. When the entire system does not need to transport the medium and enters an idle period, the electronic computer system control components enter an automatic detection state;

[0040] S2: The electronic computer system controls the operation of pump G to deliver the hot water in the hot water bucket A to the entire pipeline until it is full. The electronic computer system sets the parameters of flow meter H to determine whether the water in the delivery pipeline is full.

[0041] S3: After the entire pipeline is filled with water, the electronic computer system controls the pump G to stop running and closes the second pneumatic two-way valve D2 and the fifth pneumatic two-way valve D5;

[0042] S4: The electronic computer system opens the fourth pneumatic two-way valve D4 and the air storage tank I, and switches the fifth three-way valve E5 so that the compressed air in the air storage tank I can enter the delivery pipeline and pressurize the delivery pipeline;

[0043] S5: When the pressure value displayed by the second pressure sensor P2 remains unchanged, the electronic computer system closes the fourth pneumatic two-way valve D4;

[0044] S6: Maintain the pressure value for 5-10 minutes. If the pressure displayed by the second pressure sensor P2 drops, the electronic computer system will send out an alarm signal. It uses the principle that pipeline and valve leakage will cause pipeline air pressure to drop to determine whether the pipeline and valve are leaking. The principle is simple and the operation is convenient. The electronic computer system controls the compressed gas to enter the pipeline. After maintaining the pressure value for 5-10 minutes, the system will detect whether the pressure has dropped, and the detection efficiency is high.

[0045] S7: If an alarm is sounded, the operator will check whether there is water dripping in the color-changing tank. The valve corresponding to the color-changing tank with water dripping will be repaired or replaced in time. If there is no water dripping and the alarm is still sounded, the operator will check whether there is leakage in the pipeline. If there is no alarm, the system is normal. It can be determined directly by observation which valve is leaking, and the valve corresponding to each color-changing tank can be directly located with precise positioning.

[0046] S8: After the system in step S7 operates normally, the electronic computer system closes the port of the three-way valve connected to the dye storage barrel, opens the third two-way valve D3, switches the first three-way valve E1 so that the compressed air in the air storage tank I enters the pipeline, and blows the water in the pipeline into the dyeing tank;

[0047] S9: The electronic computer system closes the first two-way valve D1 and the second two-way valve D2;

[0048] S10: When the pressure value of the first pressure sensor P1 reaches the maximum and does not rise any more, the electronic computer system closes the third two-way valve D3;

[0049] S11: Within 5-10 minutes, if the pressure displayed by the first pressure sensor P1 drops, the electronic computer system will send out an alarm signal, and use the principle that pipeline and valve leakage will cause pipeline air pressure to drop to determine whether the pipeline and valve are leaking. The principle is simple and the operation is convenient; the electronic computer system controls the compressed gas to enter the pipeline, and 5-10 minutes after the maximum pressure is reached, the system will detect whether the pressure has dropped, and the detection efficiency is high.

[0050] S12: If an alarm signal is issued, the operator checks whether there are bubbles from bottom to top in the transparent device F. The three-way valve corresponding to the transparent device F with bubbles from bottom to top needs to be replaced or repaired. If there are no bubbles from top to bottom in the transparent device F and the system still alarms, the pipeline is leaking. The operator checks whether there is leakage in the pipeline. The valve corresponding to each transparent device F can be located by observation. The positioning is accurate, and the operator can determine which valve is leaking with simple operations.

[0051] The above embodiments are merely descriptions for the purpose of clearly illustrating the present invention, and are not limitations on the implementation methods. For those skilled in the art, other different forms of changes or modifications may be made based on the above descriptions. It is not necessary and impossible to enumerate all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A pipeline valve and pipeline leakage automatic detection method, characterized in that: The detection is performed using a pipeline delivery valve and an automatic pipeline leakage detection system, the automatic detection system comprising a hot water bucket (A), a dye storage bucket, a coloring tank, a two-way valve, a three-way valve, a pressure sensor and an air storage tank (I), characterized in that: the hot water bucket (A) is connected to the inlet of a first two-way valve (D1), the outlet of the first two-way valve (D1) is connected to the inlet of a transparent device (F), the outlet of the transparent device (F) is connected to one port of a first three-way valve (E1), the other port of the first three-way valve (E1) is connected to one port of a second three-way valve (E2), and the outlet of the first two-way valve (D1) is connected to the inlet of a transparent device (F). The other port of the second three-way valve (E2) is connected to the inlet of the second two-way valve (D2), the outlet of the second two-way valve (D2) is connected to the inlet of the pump (G), the outlet of the pump (G) is connected to the inlet of the flow meter (H), the outlet of the flow meter (H) is connected to a port of the fifth three-way valve (E5), the other port of the fifth three-way valve (E5) is connected to a port of the sixth three-way valve (E6), the other port of the sixth three-way valve (E6) is connected to the inlet of the fifth two-way valve (D5), and the outlet of the fifth two-way valve (D5) is connected to the third color tank (C3); The first dye storage barrel (B1) is connected to the inlet of the seventh two-way valve (D7), the outlet of the seventh two-way valve (D7) is connected to the inlet of the transparent device (F), the outlet of the transparent device (F) is connected to the third port of the second three-way valve (E2), and the third port of the sixth three-way valve (E6) is connected to the first dyeing cylinder (C1); The gas storage tank (I) is connected to the inlet of the tenth two-way valve (D10), the outlet of the tenth two-way valve (D10) is connected to the inlet of the third two-way valve (D3), the outlet of the third two-way valve (D3) is connected to the third port of the first three-way valve (E1), and a first pressure sensor (P1) is provided between the third two-way valve (D3) and the first three-way valve (E1); The outlet of the tenth two-way valve (D10) is connected to the inlet of the fourth two-way valve (D4), the outlet of the fourth two-way valve (D4) is connected to the third port of the fifth three-way valve (E5), and a second pressure sensor (P2) is provided between the fourth two-way valve (D4) and the fifth three-way valve (E5); The automatic detection method comprises the following steps: S1: The pipeline delivery valve and pipeline leakage automatic detection system are controlled by an electronic computer system. Before the detection, the third two-way valve (D3) and the fourth two-way valve (D4) are in a closed state, and the other valves are in an open state. When the entire system does not need to transport the medium and enters an idle period, the electronic computer system control components enter an automatic detection state; S2: The electronic computer system controls the pump (G) to run and deliver the hot water in the hot water bucket (A) to the entire pipeline until it is full. The electronic computer system sets the flow meter (H) parameters to determine whether the water in the delivery pipeline is full. S3: After the entire pipeline is filled with water, the electronic computer system controls the pump (G) to stop running and closes the second two-way valve (D2) and the fifth two-way valve (D5); S4: the electronic computer system opens the fourth two-way valve (D4) and the air storage tank (I), and switches the fifth three-way valve (E5) so that the compressed air in the air storage tank (I) enters the delivery pipeline and pressurizes the delivery pipeline; S5: When the pressure value displayed by the second pressure sensor (P2) remains balanced, the electronic computer system closes the fourth two-way valve (D4); S6: Maintain the pressure value for 5-10 minutes. If the pressure displayed by the second pressure sensor (P2) drops, the electronic computer system will issue an alarm signal; S7: If an alarm is sounded, the operator checks whether there is water dripping in the color-changing tank. The corresponding valve of the color-changing tank with water dripping is repaired or replaced in time. If there is no water dripping but the alarm is still sounded, the operator checks whether there is leakage in the pipeline. If there is no alarm, the system is normal. S8: After the system in step S7 operates normally, the electronic computer system closes the port of the three-way valve connected to the dye storage barrel, opens the third two-way valve (D3), switches the first three-way valve (E1) to allow the compressed air in the air storage tank (I) to enter the pipeline, and blows the water in the pipeline into the dyeing tank; S9: The electronic computer system closes the first two-way valve (D1) and the second two-way valve (D2); S10: When the pressure value of the first pressure sensor (P1) reaches the maximum and does not rise any more, the electronic computer system closes the third two-way valve (D3); S11: Within 5-10 minutes, if the pressure displayed by the first pressure sensor (P1) drops, the electronic computer system will issue an alarm signal; S12: If an alarm signal is issued, the operator checks whether there are bubbles from bottom to top in the transparent device (F). If bubbles from bottom to top appear in the transparent device (F) and the corresponding three-way valve, it needs to be replaced or repaired. If there are no bubbles from top to bottom in the transparent device (F) and the system still alarms, the pipeline is leaking. The operator checks whether there is leakage in the pipeline.

2. The pipeline conveying valve and pipeline leakage automatic detection method according to claim 1 is characterized by: A third three-way valve (E3) and a fourth three-way valve (E4) are connected in sequence between the second three-way valve (E2) and the second two-way valve (D2); one port of the third three-way valve (E3) is connected to one port of the second two-way valve (D2); another port of the third three-way valve (E3) is connected to one port of the fourth three-way valve (E4); another port of the fourth three-way valve (E4) is connected to the inlet of the second two-way valve (D2); the second dye storage barrel (B2) is connected to the inlet of the eighth two-way valve (D8); the outlet of the eighth two-way valve (D8) is connected to the inlet of the transparent device (F); the outlet of the transparent device (F) is connected to the third port of the third three-way valve (E3); the third dye storage barrel (B3) is connected to the inlet of the ninth two-way valve (D9); the outlet of the ninth two-way valve (D9) is connected to the inlet of the transparent device (F); and the outlet of the transparent device (F) is connected to the third port of the fourth three-way valve (E4); A seventh three-way valve (E7) is connected between the sixth three-way valve (E6) and the fifth two-way valve (D5); one port of the sixth three-way valve (E6) is connected to one port of the seventh three-way valve (E7); another port of the seventh three-way valve (E7) is connected to an inlet of the fifth two-way valve (D5); and a third port of the seventh three-way valve (E7) is connected to the second color-changing cylinder (C2).

3. The pipeline conveying valve and pipeline leakage automatic detection method according to claim 1 or 2, characterized in that: The transparent device (F) is a transparent pipe.

4. The pipeline conveying valve and pipeline leakage automatic detection method according to claim 1 or 2, characterized in that: The three-way valve is a pneumatic T-type three-way ball valve.

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