An automated detection system and method for detecting external leaks in a 120 main valve

Abstract

The present application relates to 120 main valve detection technical field, specifically disclose a kind of 120 main valve external leakage automatic detection system and detection method, wherein, automation detection system includes with 120 main valve and relief valve composition connection's air source supply system, with air source supply system connection's wind storage cylinder, with wind storage cylinder connection and main valve composition connection's gas circuit, for clamping main valve composition's clamping mechanism, for sealing main valve composition's sealing mechanism, and for controlling relief valve composition's push rod assembly;The output end of the wind storage cylinder is provided with the air pipe connected with gas circuit, detection pipeline is provided on the air pipe.And disclose detection method, compared with prior art, the present application uses automation means to replace the way of artificial brush soap water, solve the problem of missing judgment, leakage value non-quantization, valve body corrosion, etc., realize the full-automatic performance test of railway freight car 120 main valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of 120 main valve detection, and more particularly to an automatic detection system and method for external leakage of a 120 main valve. BACKGROUND

[0002] The 120 main valve is composed of a main valve assembly and a relief valve assembly, and is a main type air brake control valve for railway freight cars. The detection of external leakage of the 120 main valve after assembly is a key control element for product performance and quality, and the product technical requirements and the corresponding manufacturing technical conditions both clearly require testing.

[0003] Currently, the detection of external leakage of the 120 main valve is not automated, and manual detection by brushing soap water is required during performance testing.

[0004] The manual detection by brushing soap water has the following problems:

[0005] On the one hand, there is a large human factor, and it is easy to miss judgment, the leakage value is not quantified, and the soap water seeps into the valve body to cause rusting of the valve body.

[0006] On the other hand, the remaining detection items of the performance test are automatically detected, but due to the external leakage detection, manual attendance is still required, which hinders the development of unmanned testing and causes waste of manpower. SUMMARY

[0007] The present application solves the technical problem of providing an automatic detection system and method for external leakage of a 120 main valve.

[0008] The present application solves the technical problem by adopting the following solutions:

[0009] On the one hand:

[0010] An automatic detection system for external leakage of a 120 main valve, comprising a wind source supply system connected to the main valve assembly and the relief valve assembly of the 120 main valve, a wind storage cylinder connected to the wind source supply system, a gas circuit connected to the wind storage cylinder and the main valve assembly, a clamping mechanism for clamping the main valve assembly, a sealing mechanism for sealing the main valve assembly, and a push rod assembly for controlling the relief valve assembly.

[0011] A wind pipe connected to the gas circuit is arranged at the output end of the wind storage cylinder, and a detection pipe is arranged on the wind pipe.

[0012] In some possible embodiments,

[0013] The sealing mechanism comprises a sealing cylinder arranged corresponding to the exhaust port of the main valve assembly and connected to the wind pipe, and an electromagnetic valve K2 connected to the wind source supply system and used in cooperation with the sealing cylinder.

[0014] In some possible implementation manners,

[0015] The push rod assembly comprises a relief valve component push rod cylinder used in cooperation with the relief valve component, and an electromagnetic valve K3 connected with the air source supply system and used for controlling the relief valve component push rod cylinder.

[0016] In some possible implementation manners,

[0017] The air path comprises a column pipe air path, a local reduction air path, a sub-pipe air path, an adding pipe air path, a manufacturing pipe air path and a sealing cylinder air path, which are connected in parallel with the air pipe respectively.

[0018] The other ends of the column pipe air path, the local reduction air path, the sub-pipe air path, the adding pipe air path and the manufacturing pipe air path are connected with the main valve component respectively.

[0019] In some possible implementation manners,

[0020] An electromagnetic valve E is arranged on the column pipe air path.

[0021] An electromagnetic valve F is arranged on the manufacturing pipe air path.

[0022] In some possible implementation manners,

[0023] The detection pipeline comprises a pressure transmitter installed on the air pipe, an electromagnetic valve D arranged on the air pipe and located between the pressure transmitter and the air path, a branch pipe with one end connected with the air pipe between the pressure transmitter and the air storage cylinder and the other end connected with the air pipe between the pressure transmitter and the electromagnetic valve D, an electromagnetic valve C installed on the branch pipe, and a bypass precision detection assembly with one end connected with the branch pipe and the other end connected with the electromagnetic valve C.

[0024] In some possible implementation manners,

[0025] The bypass precision detection assembly comprises a bypass pipe with one end connected with the branch pipe and the other end connected with the electromagnetic valve C, a reference air cylinder installed on the bypass pipe and a differential pressure gauge located between the reference air cylinder and the electromagnetic valve C.

[0026] In some possible implementation manners,

[0027] An electromagnetic valve B is arranged on the branch pipe, and an electromagnetic valve A is arranged on the air pipe, the electromagnetic valve A is located between the branch pipe and the air storage cylinder, and the electromagnetic valve B is arranged between the connection point of the branch pipe and the air pipe and the connection point of the bypass pipe and the branch pipe.

[0028] In the present application, the electromagnetic valve A, the electromagnetic valve B and the electromagnetic valve F are two-position two-way electromagnetic valves, which are mainly used for turning on or turning off the air path.

[0029] The electromagnetic valve C, the electromagnetic valve D and the electromagnetic valve E are two-position three-way electromagnetic valves, which are mainly used for turning on and turning off the air path.

[0030] The clamping mechanism comprises an electromagnetic valve K1 connected with the air source supply system, and a clamping cylinder for clamping and fixing the 120 main valve;

[0031] The electromagnetic valve K1, the electromagnetic valve K2 and the electromagnetic valve K3 are two-position five-way electromagnetic valves, which are mainly used for controlling the action of the cylinder;

[0032] The pressure transmitter is mainly used for initial detection of relatively large external leakage, and the precision is 1 kPa.

[0033] The differential pressure gauge is mainly used for accurate detection of relatively small external leakage, and the precision is 5 Pa.

[0034] On the other hand:

[0035] The application further discloses a detection method of the automatic detection system for external leakage of the 120 main valve, which is used for relieving the external leakage test under the initial position working condition of the valve assembly and the working position working condition of the valve assembly, and specifically comprises the following steps:

[0036] Step S1: the 120 main valve is clamped by opening the electromagnetic valve K1 to control the clamping cylinder, and a ball valve arranged on the air source supply system is opened to fill the storage cylinder with 600 kPa pressure air;

[0037] Step S2: relieving the valve initial position working condition detection;

[0038] Step S21: the electromagnetic valve K2 is controlled to be opened to seal the exhaust port of the main valve assembly, and the electromagnetic valve A, the electromagnetic valve B, the electromagnetic valve D, the electromagnetic valve E and the electromagnetic valve F are opened in sequence with an interval of 1 s, so that the main piston rod of the main valve assembly is lowered to form the relieving valve initial position working condition;

[0039] The pressure air is filled into the main valve assembly and the relieving valve assembly by filling the pressure air into the column pipe gas circuit, the local reduction gas circuit, the auxiliary pipe gas circuit, the adding pipe gas circuit and the manufacturing pipe gas circuit;

[0040] In this state, the pressure air can be provided for seven positions, i.e., the front cover joint surface of the main valve, the upper cover joint surface, the lower cover joint surface, the relieving valve joint surface, the front cover local reduction breathing hole, the relieving valve exhaust hole and the relieving valve handle, so that the test conditions are met;

[0041] Step S22: after the pressure air is filled to a constant pressure of 600 kPa, the electromagnetic valve B and the electromagnetic valve A are closed, and the pressure is stabilized for 5 s; and the external leakage initial test is prepared for the next step;

[0042] Step S23: after the pressure is stabilized, the external leakage initial test is performed;

[0043] Whether the external leakage exists is determined by detecting the pressure drop change of the pressure transmitter within a certain time;

[0044] If the pressure transmitter has a pressure drop > 2kPa within 5s, the initial test is unqualified;

[0045] If the pressure transmitter has a pressure drop ≤ 2kPa within 5s, the initial test is qualified;

[0046] Step S24: In the case of qualified external leakage initial test, perform accurate detection of external leakage;

[0047] Step S241: Open electromagnetic valve A and electromagnetic valve B, and charge the main valve assembly and the relief valve assembly to 600kPa again, so as to realize supplement of pressure wind for leakage generated in the external leakage initial test process, and avoid misjudgment and inaccurate test;

[0048] Step S242: Control electromagnetic valve C to make the bypass pipe and the branch pipe communicate, and control the differential pressure meter to be connected with the column pipe gas circuit, the local reduction gas circuit, the auxiliary pipe gas circuit, the addition pipe gas circuit and the preparation pipe gas circuit respectively, disconnect the reference air cylinder and the air storage cylinder, and start the accurate detection of external leakage;

[0049] Step S243: Detect the pressure drop of the column pipe gas circuit, the local reduction gas circuit, the auxiliary pipe gas circuit, the addition pipe gas circuit and the preparation pipe gas circuit from the reference air cylinder by the differential pressure meter, and judge the pressure drop within a certain time;

[0050] If the pressure drop ≤ 300Pa within 15s, the accurate detection is qualified;

[0051] If the pressure drop > 300Pa within 15s, the accurate detection is unqualified;

[0052] Step S25: Exhaust, and end the test;

[0053] Step S3: External leakage initial test and accurate detection in the working position of the relief valve.

[0054] In some possible embodiments, the step S3 specifically includes the following steps:

[0055] Step S31: Close electromagnetic valve C, open electromagnetic valve A and electromagnetic valve B to make the 120 main valve in a continuous charging state; open electromagnetic valve E to exhaust the pressure in the column pipe gas circuit to make the main piston rod in the main valve assembly move upward; close electromagnetic valve F to cut off the preparation pipe gas circuit, and open electromagnetic valve K3 to make the relief valve handle part of the relief valve assembly move upward to form the working position of the relief valve assembly;

[0056] Step S32: Open electromagnetic valve F to charge the downstream of the brake cylinder in the relief valve assembly, and determine whether the piston rod in the relief valve assembly moves upward by the pressure change of the pressure transmitter;

[0057] The step has the effect of preventing the relief valve from being unable to move up to the working position of the relief valve due to self-failure of the relief valve assembly, thereby causing the relief valve to leak at the upper breathing hole;

[0058] Step S33: If the piston rod moves up, the electromagnetic valve F is closed, the electromagnetic valve E is opened, and pressure air is filled into the 120 main valve.

[0059] In this state, in addition to the pressure air at the joint surfaces of the main valve, the breathing hole of the local relief valve, the exhaust hole of the relief valve, and the handle of the relief valve, the chamber below the upper breathing hole of the relief valve also has pressure air.

[0060] Step S34: Repeat steps S22-S25 to perform external leakage preliminary detection and external leakage precision detection in the working position of the relief valve.

[0061] Compared with the prior art, the beneficial effects of the present application are:

[0062] The present application controls the electromagnetic valve to fill pressure air into the relevant air path of the 120 main valve from the air storage cylinder according to a certain logic sequence, so that the main piston rod in the main valve assembly and the relief valve piston rod in the relief valve assembly move, forming the initial position of the relief valve and the working position of the relief valve; then pressure air is filled into the external leakage position to be detected under the two working conditions, the pressure change in the air path is detected by using a pressure transmitter and a differential pressure gauge, and it is automatically judged whether the 120 main valve leaks under the corresponding working condition; compared with the prior art, the present application uses an automatic means to replace the manual soap water brushing method, solves the problems of missed judgment, non-quantization of leakage value, and valve body corrosion, and realizes full-automatic performance testing of the 120 main valve of the railway freight car;

[0063] The present application can effectively realize the quantization of the leakage value of the 120 main valve, and does not cause corrosion of the entire valve body in the 120 main valve, and does not need manual attendance during detection, thereby reducing the detection cost. BRIEF DESCRIPTION OF DRAWINGS

[0064] Figure 1 The figure is a structural schematic diagram of the automatic detection system in the present application;

[0065] Wherein: 1-air storage cylinder, 2-clamping mechanism, 3-sealing mechanism, 4-push rod assembly, 5-tube air path, 51-electromagnetic valve E, 6-local relief air path, 7-secondary tube air path, 8-tube air path, 9-tube air path, 91-electromagnetic valve F, 10-pressure transmitter, 11-electromagnetic valve D, 12-electromagnetic valve C, 13-reference air cylinder, 14-differential pressure gauge, 15-electromagnetic valve B, 16-electromagnetic valve A. DETAILED DESCRIPTION

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] The present invention will now be described in detail.

[0068] It should be noted that the main external leakage detection points under the initial position of the relief valve are: the mating surface of the main valve front cover, the mating surface of the upper cover, the mating surface of the lower cover, the mating surface of the relief valve, the breather hole of the front cover, the exhaust hole of the relief valve, and the handle of the relief valve.

[0069] The main external leakage detection points under the working position of the relief valve are: the mating surface of the main valve front cover, the mating surface of the upper cover, the mating surface of the lower cover, the mating surface of the relief valve, the breather hole of the front cover partial reduction section, the exhaust hole of the relief valve, the handle of the relief valve, and the upper breather hole of the relief valve.

[0070] The release valve includes a piston section and a handle section, with the downstream end of the brake cylinder connected to the interior of the piston section in the release valve.

[0071] on the one hand:

[0072] like Figure 1 As shown, an automated detection system for external leakage of a 120 main valve includes an air supply system connected to the main valve assembly and the relief valve assembly in the 120 main valve, an air storage cylinder 1 connected to the air supply system, an air passage connected to the air storage cylinder 1 and the main valve assembly, a clamping mechanism 2 for clamping the main valve assembly, a sealing mechanism 3 for sealing the main valve assembly, and a push rod assembly 4 for controlling the relief valve assembly.

[0073] A duct connected to the air passage is provided at the output end of the air storage cylinder 1, and a detection pipeline for external leakage is provided on the duct for the initial position and working position of the relief valve.

[0074] The sealing mechanism 3 includes a sealing cylinder connected with the main valve and connected with the air pipe, and an electromagnetic valve K2 connected with the air supply system.

[0075] The push rod assembly 4 includes a relief valve assembly push rod cylinder connected with the relief valve assembly, and an electromagnetic valve K3 connected with the air supply system for controlling the relief valve assembly push rod cylinder.

[0076] The air path includes a column pipe air path 5, a local reduction air path 6, a secondary pipe air path 7, an acceleration pipe air path 8, a brake pipe air path 9, and a sealing cylinder air path, which are connected with the air pipe in parallel respectively.

[0077] The other ends of the column pipe air path 5, the local reduction air path 6, the secondary pipe air path 7, the acceleration pipe air path 8, and the brake pipe air path 9 are connected with the main valve assembly respectively.

[0078] The column pipe air path 5 is connected with the train pipe hole of the 120 main valve mounting surface, the brake pipe air path 9 is connected with the downstream channel of the brake cylinder, the local reduction air path 6 is connected with the local reduction hole of the 120 main valve mounting surface, the secondary pipe air path 7 is connected with the secondary air cylinder hole of the 120 main valve mounting surface, the acceleration pipe air path 8 is connected with the acceleration relief air cylinder hole of the 120 main valve mounting surface, and the sealing cylinder air path is connected with the sealing cylinder.

[0079] In some possible embodiments,

[0080] An electromagnetic valve E51 is arranged on the column pipe air path 5.

[0081] An electromagnetic valve F91 is arranged on the brake pipe air path 9.

[0082] In some possible embodiments,

[0083] The detection pipeline includes a pressure transmitter 10 mounted on the air pipe, an electromagnetic valve D11 arranged on the air pipe between the pressure transmitter 10 and the air path, a branch pipe with one end connected with the pressure transmitter 10 and the air pipe and the other end connected with the pressure transmitter 10 and the electromagnetic valve D11, an electromagnetic valve C12 mounted on the branch pipe, and a bypass precision detection assembly with one end connected with the branch pipe and the other end connected with the electromagnetic valve C12.

[0084] In some possible embodiments,

[0085] The bypass precision detection assembly includes a bypass pipe with one end connected with the branch pipe and the other end connected with the electromagnetic valve C12, a reference air cylinder 13 and a differential pressure gauge 14 mounted on the bypass pipe, and the differential pressure gauge 14 is located between the reference air cylinder 13 and the electromagnetic valve C12.

[0086] In some possible embodiments,

[0087] An electromagnetic valve B15 is arranged on the branch pipe, and an electromagnetic valve A16 is arranged on the air pipe and located between the branch pipe and the air storage cylinder 1, and the electromagnetic valve B15 is arranged between the connection point of the branch pipe and the air pipe and the connection point of the bypass pipe and the branch pipe.

[0088] In the present application, the electromagnetic valve A16, the electromagnetic valve B15 and the electromagnetic valve F91 are two-position two-way electromagnetic valves, mainly used for the opening or closing of the gas circuit;

[0089] The electromagnetic valve C12, the electromagnetic valve D11 and the electromagnetic valve E51 are two-position three-way electromagnetic valves, mainly used for the opening and exhaust of the gas circuit;

[0090] The clamping mechanism 2 comprises an electromagnetic valve K1 connected with the air source supply system, and a clamping cylinder for clamping and fixing the 120 main valve;

[0091] The electromagnetic valve K1, the electromagnetic valve K2 and the electromagnetic valve K3 are two-position five-way electromagnetic valves, mainly used for controlling the action of the cylinder;

[0092] The pressure transmitter 10 is mainly used for initial detection of larger external leakage, and the precision is 1kPa.

[0093] The differential pressure gauge 14 is mainly used for accurate detection of smaller external leakage, and the precision is 5Pa.

[0094] On the other hand:

[0095] The present application further discloses a detection method of the automatic detection system of the external leakage of the 120 main valve, which is used for relieving the external leakage test under the initial position working condition of the valve group and the working position working condition of the valve group, and specifically comprises the following steps:

[0096] Step S1: The clamping cylinder is controlled by opening the electromagnetic valve K1 to clamp the 120 main valve, and a ball valve arranged on the air source supply system is opened to fill the air storage cylinder 1 with 600kPa pressure air;

[0097] Step S2: Relieving the valve initial position working condition detection;

[0098] Step S21: The electromagnetic valve K2 is controlled to be opened to seal the exhaust port of the main valve group, and the electromagnetic valve A16, the electromagnetic valve B15, the electromagnetic valve D11, the electromagnetic valve E51 and the electromagnetic valve F91 are opened in sequence with an interval of 1s to make the main piston rod in the main valve group move downward to form the relieving valve initial position working condition;

[0099] The pressure air is filled into the main valve group and the relieving valve group through the column pipe gas circuit 5, the local reduction gas circuit 6, the auxiliary pipe gas circuit 7, the adding pipe gas circuit 8 and the manufacturing pipe gas circuit 9;

[0100] In this state, the main valve front cover joint surface, the upper cover joint surface, the lower cover joint surface, the relief valve joint surface, the front cover local relief breathing hole, the relief valve exhaust hole, and the relief valve handle are all under pressure wind, meeting the test conditions;

[0101] Step S22: After the pressure wind is filled to a constant pressure of 600 kPa, the electromagnetic valve B15 and the electromagnetic valve A16 are closed, and the pressure is stabilized for 5s, preparing for the next step of external leakage test;

[0102] Step S23: After the pressure is stabilized, the external leakage test is performed.

[0103] The pressure drop of the pressure transmitter 10 is detected within a certain time to determine whether there is external leakage.

[0104] If the pressure drop of the pressure transmitter 10 is greater than 2 kPa within 5s, the test is unqualified.

[0105] If the pressure drop of the pressure transmitter 10 is less than or equal to 2 kPa within 5s, the test is qualified.

[0106] Step S24: In the case of qualified external leakage test, the external leakage precision detection is performed.

[0107] Step S241: Open the electromagnetic valve A16 and the electromagnetic valve B15, and charge the main valve group and the relief valve group to 600 kPa again, so as to supplement the pressure wind generated during the external leakage test process, avoid misjudgment, and cause inaccurate test.

[0108] Step S242: Control the electromagnetic valve C12 to connect the bypass pipe and the branch pipe, and control the differential pressure meter 14 to be connected with the column pipe gas path 5, the local reduction gas path 6, the auxiliary pipe gas path 7, the addition pipe gas path 8, and the preparation pipe gas path 9, respectively. Control the electromagnetic valve A16 and the electromagnetic valve B15 to disconnect the reference wind cylinder 13 and the wind storage cylinder 1, and start the external leakage precision detection.

[0109] Step S243: Detect the pressure drop of the column pipe gas path 5, the local reduction gas path 6, the auxiliary pipe gas path 7, the addition pipe gas path 8, and the preparation pipe gas path 9 from the reference wind cylinder 13 by the differential pressure meter 14, and judge the pressure drop within a certain time.

[0110] If the pressure drop is less than or equal to 300 Pa within 15s, the precision detection is qualified.

[0111] If the pressure drop is greater than 300 Pa within 15s, the precision detection is unqualified.

[0112] Step S25: Exhaust, and the test is completed.

[0113] Step S3: External leakage test and precision detection in the working position of the relief valve.

[0114] In some possible implementation manners, the step S3 specifically comprises the following steps.

[0115] Step S31: close the electromagnetic valve C12, open the electromagnetic valve A16 and the electromagnetic valve B15 to make the 120 main valve in a continuous charging state; open the electromagnetic valve E51 to empty the pressure in the column pipe gas circuit 5 to make the main piston rod in the main valve assembly move upward; close the electromagnetic valve F91 to cut off the pipe gas circuit 9, and open the electromagnetic valve K3 to make the relief valve handle part of the relief valve assembly move upward to form a working position of the relief valve.

[0116] In the present application, the closed electromagnetic valve F91 cuts off the pipe gas circuit 9, so that the relief valve piston rod moves upward to form a working position of the relief valve. At this time, the downstream gas circuit of the brake cylinder is in communication with the atmosphere. If the electromagnetic valve D11 is directly opened to detect the pressure of the main valve assembly, the pressure air will be directly discharged to the atmosphere, and the pressure detection cannot be achieved. The electromagnetic valve F91 is arranged to cut off the downstream gas circuit of the brake cylinder, so that the pressure air charged into the main valve assembly cannot flow to the atmosphere.

[0117] Step S32: open the electromagnetic valve F91 to charge the downstream of the brake cylinder in the relief valve assembly, and determine whether the piston rod in the relief valve assembly moves upward by the pressure change of the pressure transmitter 10.

[0118] The step is used to prevent the relief valve piston rod from not moving upward to form a working position of the relief valve due to a fault of the relief valve assembly, and to cause a missed detection at the upper breathing hole of the relief valve.

[0119] Step S33: if the piston rod moves upward, close the electromagnetic valve F91 and open the electromagnetic valve E51 to charge the 120 main valve with pressure air.

[0120] In this state, in addition to the pressure air at the combined surfaces of the main valve (the combined surface of the main valve front cover, the upper cover combined surface, the lower cover combined surface, and the relief valve surface combined surface), the front cover local relief valve breathing hole, the relief valve exhaust hole, and the relief valve handle, the chamber below the upper breathing hole of the relief valve also has pressure air.

[0121] Step S34: repeat steps S22-S25 to perform external leakage preliminary test and external leakage precision detection in the working position of the relief valve.

[0122] The present application controls the electromagnetic valve to fill pressure air to the 120 main valve related air path by the air storage cylinder 1 according to certain logic sequence, so that the main piston rod in the main valve group and the relief valve piston rod in the relief valve group act, forming the relief valve initial position and the relief valve working position working condition; then pressure air is filled to the external leakage position needing to be detected under the two working conditions respectively, the pressure change of the whole air path is detected through the pressure transmitter 10 and the differential pressure gauge 14, and it is automatically judged whether the 120 main valve leaks under the corresponding working condition; compared with the prior art, the present application replaces the manual soap water brushing mode with an automatic means, solves the problems of missed judgment, non-quantization of leakage value, valve body corrosion and the like, and realizes the full-automatic performance test of the 120 main valve of the railway wagon. The present application is not limited to the foregoing specific embodiments. The present application extends to any novel feature or any new combination disclosed in the specification, and any new method or process step or any new combination disclosed.

Claims

1. A method for automated detection of external leaks of a 120 main valve, based on an automated detection system, for performing external leak tests in a relief valve assembly initial position operating condition and in a relief valve assembly working position operating condition, characterized in that, The automatic detection system comprises a wind source supply system connected with the main valve assembly and the relief valve assembly, a wind storage cylinder connected with the wind source supply system, an air path connected with the wind storage cylinder and the main valve assembly, a clamping mechanism for clamping the main valve assembly, a sealing mechanism for sealing the main valve assembly, and a push rod assembly for controlling the relief valve assembly; an air pipe connected with the air path is arranged at the output end of the wind storage cylinder, and a detection pipeline with a branch pipe is arranged on the air pipe; an electromagnetic valve A is arranged on the air pipe, and an electromagnetic valve B is arranged on the branch pipe; the electromagnetic valve A is located between the branch pipe and the wind storage cylinder, and the electromagnetic valve B is arranged between the connection point of the branch pipe and the air pipe and the connection point of the bypass pipe and the branch pipe; The automatic detection method comprises the following steps: Step S1: filling the wind storage cylinder with 600kPa pressure wind; Step S2: initial position working condition detection of the relief valve; Step S21: sealing the exhaust port of the main valve assembly and forming the initial position working condition of the relief valve, and filling the main valve assembly and the relief valve assembly with pressure wind; Step S22: after being filled to a constant pressure of 600kPa, closing the electromagnetic valve B and the electromagnetic valve A, and stabilizing for 5s; Step S23: external leakage preliminary test; Whether external leakage occurs is determined by detecting the pressure drop of the pressure transmitter within a certain time; If the pressure drop of the pressure transmitter is greater than 2kPa within 5s, the preliminary test is unqualified; If the pressure drop of the pressure transmitter is less than or equal to 2kPa within 5s, the preliminary test is qualified; Step S24: in the case that the external leakage preliminary test is qualified, performing external leakage precision detection; Step S241: filling the main valve assembly and the relief valve assembly to 600kPa; Step S242: controlling the electromagnetic valve C to make the bypass pipe and the branch pipe communicate, and controlling the differential pressure meter to be connected with the column pipe air path, the local reduction air path, the auxiliary pipe air path, the addition pipe air path and the preparation pipe air path respectively, and disconnecting the reference wind cylinder and the wind storage cylinder; Step S243: detecting the differential pressure between the column pipe air path, the local reduction air path, the auxiliary pipe air path, the addition pipe air path and the preparation pipe air path and the reference wind cylinder by the differential pressure meter, and judging the pressure drop within a certain time; If the pressure drop is less than or equal to 300Pa within 15s, the precision detection is qualified; If the pressure drop is greater than 300Pa within 15s, the precision detection is unqualified; Step S25: exhaust, and the test is finished; Step S3: external leakage preliminary test and precision detection of the relief valve in the working position working condition.

2. The automated method of detecting external leaks of a 120 main valve of claim 1, wherein, The sealing mechanism comprises a sealing cylinder corresponding to the exhaust port of the main valve assembly and connected with the air pipe.

3. The automated method of detecting external leaks of a 120 main valve of claim 1, wherein, The push rod assembly comprises a relief valve assembly push rod cylinder used in cooperation with the relief valve assembly and connected with the wind source supply system.

4. The automated method of detecting external leaks of a 120 main valve of claim 2, wherein, The air path comprises the column pipe air path, the local reduction air path, the auxiliary pipe air path, the addition pipe air path, the preparation pipe air path and the sealing cylinder air path connected with the air pipe in parallel respectively; The other ends of the column pipe air path, the local reduction air path, the auxiliary pipe air path, the addition pipe air path and the preparation pipe air path are connected with the main valve assembly respectively.

5. A method of automated detection of external leaks of a 120 main valve as defined in claim 4, wherein, An electromagnetic valve E is arranged on the column pipe air path. An electromagnetic valve F is arranged on the preparation pipe air path.

6. The automated method of detecting external leaks of a 120 main valve of claim 5, wherein, The detection pipeline comprises a pressure transmitter installed on the air pipe, an electromagnetic valve D arranged on the air pipe between the pressure transmitter and the air path, a branch pipe with one end communicated with the pressure transmitter and the air cylinder and the other end communicated with the pressure transmitter and the electromagnetic valve D, an electromagnetic valve C installed on the branch pipe, and a bypass precision detection assembly with one end connected with the branch pipe and the other end connected with the electromagnetic valve C.

7. A method of automated detection of external leaks of a 120 main valve according to claim 6, wherein, The bypass precision detection assembly comprises a bypass pipe with one end connected with the branch pipe and the other end connected with the electromagnetic valve C, a reference air cylinder and a differential pressure gauge installed on the bypass pipe, and the differential pressure gauge is arranged between the reference air cylinder and the electromagnetic valve C.

8. The automated method of detecting external leaks of a 120 main valve of claim 5, wherein, The step S3 specifically comprises the following steps: Step S31: closing the electromagnetic valve C, opening the electromagnetic valve A and the electromagnetic valve B to make the 120 main valve in a continuous inflation state; opening the electromagnetic valve E, closing the electromagnetic valve F, and opening the electromagnetic valve K3 to form a relief valve working position working condition; Step S32: opening the electromagnetic valve F to inflate the brake cylinder downstream in the relief valve group, and determining whether the piston rod in the relief valve group moves up through the pressure change of the pressure transmitter; Step S33: if the piston rod moves up, closing the electromagnetic valve F, opening the electromagnetic valve E, and inflating the 120 main valve with pressure air; Step S34: repeating the steps S22-S25 to perform external leakage preliminary test and external leakage precision detection in the relief valve working position working condition.

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