CN108302094B - Hydraulic valve internal leakage detection device and method - Google Patents
Hydraulic valve internal leakage detection device and method Download PDFInfo
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- CN108302094B CN108302094B CN201711310650.6A CN201711310650A CN108302094B CN 108302094 B CN108302094 B CN 108302094B CN 201711310650 A CN201711310650 A CN 201711310650A CN 108302094 B CN108302094 B CN 108302094B
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Abstract
The invention discloses a hydraulic valve internal leakage detection device which comprises a gas source, a pressure regulating valve, a confluence plate, a first pressure regulating device for improving detection accuracy, a detection tool movably connected with a hydraulic valve, a second pressure regulating device and a cylinder for driving the hydraulic valve to move to the detection tool for realizing connection, wherein the gas source, the pressure regulating valve, the confluence plate, the first pressure regulating device and the detection tool are sequentially connected through a gas conveying pipeline to form a detection gas circuit, the gas source, the pressure regulating valve, the second pressure regulating device and the cylinder are sequentially connected through a gas conveying pipeline to form a power output gas circuit, and the power output gas circuit is movably connected with the detection gas circuit. The invention also discloses a hydraulic valve internal leakage detection method, and the hydraulic valve internal leakage detection device and the hydraulic valve internal leakage detection method can improve the detection efficiency and are beneficial to improving the detection accuracy.
Description
Technical Field
The invention relates to the technical field of hydraulic valve detection, in particular to a device and a method for detecting leakage in a hydraulic valve.
Background
The reversing working principle of the hydraulic valve is as follows: the push rod is driven by external force (such as electromagnetic force, hydraulic force or manual driving force), so that the valve core slides relative to the valve body, and a corresponding oil way is opened or closed, thereby achieving the purpose of converting the oil way. For example, the 20-type and 28-type hydraulic valves use the relative movement of the valve core in the valve body to control the opening and closing of the valve port and the size of the opening, so as to realize the control of pressure, flow and direction. Six valve ports are arranged on the valve bodies of the 20-type hydraulic valve and the 28-type hydraulic valve: the hydraulic valve comprises a valve body, an FL port, an F port, an FR port, an R port, an RL port and an RR port, wherein the FL port, the F port, the FR port, the R port, the RL port and the RR port are located on the same surface of the valve body, the F port and the R port are respectively located on two sides of the hydraulic valve, the FL port and the FR port are respectively arranged below the F port, the F port is respectively communicated with the FL port and the FR port, the RL port and the RR port are respectively arranged below the R port, the R port is respectively communicated with the RL port and the RR port, the flow dividing effect is obtained from the F port to the FL port and from the F port to the FR port, and the flow dividing effect is obtained from the R port to the RR port.
In the above process, in order to ensure the smooth movement of the valve core in the valve body, a certain gap needs to be maintained between the two, otherwise, the valve core and the valve body are in close contact, and the friction force is too large to cause the valve core and the valve body to be unable to move. Due to the existence of the fit clearance between the valve core and the valve body, the physical phenomenon that hydraulic oil flows from a high-pressure area to a low-pressure area of the valve when the hydraulic valve works can occur, and the flow is generated in the hydraulic valve and is called internal leakage. In addition, the contact line (surface) of the valve body and the valve core is damaged and is not tightly fit with each other, the conical surface at the front end of the valve core is not coaxial with the excircle of the valve core, the coaxiality of the valve body hole and the valve core is out of tolerance, the fit clearance between the excircle and the valve body hole is large during valve core assembly, and manufacturing or assembly quality faults such as inclined press fitting and the like are generated in the hole, so that internal leakage of the hydraulic valve is possibly caused.
The internal leakage of the hydraulic valve is different from the external leakage, and the external leakage refers to the phenomenon that the hydraulic valve leaks oil outwards at the connection part with other hydraulic elements. The external leakage is visual, easy to observe and easy to avoid; the internal leakage is mostly generated inside the hydraulic valve, is difficult to observe and can not be avoided, namely the hydraulic valve has more or less internal leakage. Therefore, when manufacturing and assembling the hydraulic valve, the clearance between the valve core and the valve body is generally controlled within a certain range (mostly, the diameter clearance is 5-30um in engineering), and accordingly, the internal leakage of the hydraulic oil corresponding to the clearance range becomes one of the important characteristics for measuring the hydraulic valve. The internal leakage amount is too large, so that the action of an actuating mechanism of a hydraulic system assembling host machine is not in place, the action track is difficult to accurately control, and automatic action can also occur in serious conditions, thereby causing potential safety hazards. The existing detection methods for the internal leakage of the hydraulic valve have two types: firstly, the number of drops of leakage liquid is manually recorded and then converted into the number of milliliters, or the number of milliliters is collected by using a measuring cup for measurement and comparison, and the detection mode has the defects of large influence of human factors, low detection efficiency and the like; secondly, the flow sensor measures the flow value and then judges whether the flow value meets the production requirement, and the detection method has the problems of complex detection and long time consumption.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an internal leakage detection device of a hydraulic valve, which is beneficial to improving the detection efficiency and accuracy.
The invention also aims to provide a hydraulic valve internal leakage detection method, which can improve the detection efficiency and is beneficial to improving the detection accuracy.
One of the purposes of the invention is realized by adopting the following technical scheme:
leak detection device in hydrovalve, including air supply, air-vent valve, cylinder manifold, be used for improving the first pressure regulating device of the precision that detects, be used for with hydrovalve swing joint's detection frock, second pressure regulating device and be used for driving the cylinder that the hydrovalve moved toward the direction that is close to or keeps away from the detection frock, air supply, air-vent valve, cylinder manifold, first pressure regulating device and detection frock between connect gradually through gas transmission pipeline and form the detection gas circuit, connect gradually through gas transmission pipeline between air supply and air-vent valve, second pressure regulating device, the cylinder and form the power take off gas circuit, power take off gas circuit and detect swing joint between the gas circuit.
Furthermore, the detection tool is provided with a first detection port, a second detection port, a third detection port, a fourth detection port, a fifth detection port and a sixth detection port, the second detection port and the fourth detection port are respectively located on two sides of the detection tool, the first detection port and the third detection port are respectively arranged below the second detection port, the fifth detection port and the sixth detection port are respectively arranged below the fourth detection port, and the first detection port, the second detection port, the third detection port, the fourth detection port, the fifth detection port and the sixth detection port are used for being in one-to-one correspondence and movable connection with the positions of the FL port, the F port, the FR port, the R port, the RL port and the RR port.
Further, first pressure regulating device includes a plurality of pressure regulating subassembly, the quantity of pressure regulating subassembly sets up to six, and each pressure regulating subassembly detects mouth, second respectively, third detection mouth, fourth detection mouth, fifth detection mouth, sixth detection mouth and is connected with first detection mouth, second detection mouth, third detection mouth, fourth detection mouth, fifth detection mouth and sixth detection branch road respectively, forms first detection branch road, second detection branch road, third detection branch road, fourth detection branch road, fifth detection branch road and sixth detection branch road, the pressure regulating subassembly is including being used for the first solenoid valve of being connected with the PLC controller, pressure transmitter and being used for improving the miniature gas pitcher of the stability of gas pressure, connect gradually between first solenoid valve, pressure transmitter and the miniature gas pitcher, first solenoid valve all is connected with the gas outlet of cylinder manifold, miniature gas pitcher respectively with first detection mouth, second detection mouth, third detection mouth, fourth detection mouth, fifth detection mouth, The sixth detection port is connected.
Further, a piston rod and an inner cavity which are movably connected with the hydraulic valve are arranged in the cylinder, the piston rod is arranged in the inner cavity and is in sliding connection with the inner cavity, a first driving cavity and a second driving cavity are formed between the piston rod and the inner cavity, and the first driving cavity and the second driving cavity are respectively located on two sides of the piston rod.
Further, the second pressure regulating device comprises a second electromagnetic valve and a throttle valve, the second electromagnetic valve is connected with the pressure regulating valve, the number of the throttle valves is two, a first gas branch and a second gas branch are formed between the two throttle valves and the second electromagnetic valve respectively, the two throttle valves are connected with a first driving cavity and a second driving cavity respectively, the first gas branch is communicated with the first driving cavity, and the second gas branch is communicated with the second driving cavity.
The second purpose of the invention is realized by adopting the following technical scheme:
the method for detecting the leakage in the hydraulic valve comprises the following steps,
the installation step: the hydraulic valve is connected with the detection tool;
the PLC controller controls a second electromagnetic valve to work, the second gas branch generates gas, the liquid valve is movably mounted on a piston rod, the piston rod moves towards the direction close to the detection tool, and the first detection port, the second detection port, the third detection port, the fourth detection port, the fifth detection port and the sixth detection port are correspondingly connected with the FL port, the F port, the FR port, the R port, the RL port and the RR port one by one;
and (B) detection step A: detecting the pressure transmitter, and detecting whether the hydraulic valve is ventilated normally;
the PLC controller controls a first electromagnetic valve on a second detection branch to work, gas is introduced into the second detection branch, the gas enters an F port corresponding to the second detection branch through a second detection port, the gas enters a hydraulic valve, a first detection port and a third detection port are opened, the gas enters a pressure transmitter on the first detection branch through the first detection port, the gas enters a pressure transmitter on the third detection branch through the third detection port, the sum of pressure changes of the pressure transmitter on the first detection branch and the pressure transmitter on the third detection branch is compared with the pressure value of the pressure transmitter on the second detection branch, and whether the pressure changes are equal to each other or not is judged to obtain a conclusion a;
the PLC controls a first electromagnetic valve on a fourth detection branch to work, gas is introduced into the fourth detection branch, the gas enters an R port corresponding to the fourth detection branch through a fourth detection port, the gas enters a hydraulic valve, a fifth detection port and a sixth detection port are opened, the gas enters a pressure transmitter on a fifth detection branch through a fifth detection port, the gas enters a pressure transmitter on a sixth detection branch through the sixth detection port, the sum of pressure changes of the pressure transmitter on the fifth detection branch and the pressure transmitter on the sixth detection branch is compared with the pressure value of the pressure transmitter on the fourth detection branch, and whether the pressure changes are equal to each other or not is judged to obtain a conclusion b;
and according to the conclusion a and the conclusion b, whether the ventilation of the first detection branch, the second detection branch, the third detection branch, the fourth detection branch, the fifth detection branch and the sixth detection branch is normal is detected.
Further, after the detecting step a, the method further comprises:
and B, detection: the PLC controls a first electromagnetic valve on a first detection branch to work, gas is introduced into the first detection branch, the gas enters an FL port corresponding to the first detection branch through a first detection port, the gas enters a hydraulic valve, a second detection port is opened, the gas enters a pressure transmitter on a second detection branch through a second detection port, the pressure values of the pressure transmitter on the second detection branch and the pressure transmitter on the first detection branch are compared, and whether the pressure values are equal to each other or not is judged to obtain a conclusion c;
the PLC controls a first electromagnetic valve on a fifth detection branch to work, gas is introduced into the fifth detection branch, the gas enters a RL port corresponding to the fifth detection port through the fifth detection port, the gas enters a hydraulic valve, a fourth detection port is opened, the gas enters a pressure transmitter on a fourth detection branch through the fourth detection port, the pressure values of the pressure transmitter on the fourth detection branch and the pressure transmitter on the fifth detection branch are compared, and whether the pressure values are equal to each other or not is judged to obtain a conclusion d;
the PLC controls a first electromagnetic valve on a third detection branch to work, gas is introduced into the third detection branch, the gas enters an FR port corresponding to the third detection branch through a third detection port, the gas enters a hydraulic valve, a second detection port is opened, the gas enters a pressure transmitter on the second detection branch through the second detection port, the pressure values of the pressure transmitter on the second detection branch and the pressure transmitter on the third detection branch are compared, and whether the pressure values are equal to each other or not is judged to obtain a conclusion e;
the PLC controller controls a first electromagnetic valve on a sixth detection branch to work, the sixth detection branch is filled with gas, the gas enters an RR port corresponding to the sixth detection port through the sixth detection port, the gas enters a hydraulic valve, the fourth detection port is opened, the gas enters a pressure transmitter on the fourth detection branch through the fourth detection port, the pressure values of the pressure transmitter on the fourth detection branch and the pressure transmitter on the sixth detection branch are compared, and whether the pressure transmitter and the pressure transmitter are equal or not is judged to obtain a conclusion f.
Further, if the conclusion a, the conclusion b, the conclusion c, the conclusion d, the conclusion e and the conclusion f all meet the set requirements, the PLC controller outputs qualified light and turns on a green light; and if any one of the conclusion a, the conclusion b, the conclusion c, the conclusion d, the conclusion e and the conclusion f does not meet the set requirement, the PLC outputs unqualified results, the red light is lightened, the alarm is given, and the detection tool is automatically locked.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention relates to an internal leakage detection device of a hydraulic valve, which comprises a gas source, a pressure regulating valve, a confluence plate, a first pressure regulating device, a detection tool, a second pressure regulating device and a cylinder, wherein the detection tool is movably connected with the hydraulic valve, so that the gas source, the pressure regulating valve, the confluence plate, the first pressure regulating device and the detection tool are sequentially connected through a gas conveying pipeline to form a detection gas circuit, gas in the gas source is sequentially conveyed to the pressure regulating valve, the confluence plate, the first pressure regulating device and the detection tool through the gas conveying pipeline, the pressure regulating valve can regulate the gas pressure of the gas, the first pressure regulating device further regulates the gas pressure of the gas flowing out of the confluence plate, the regulated gas enters the detection tool to achieve the purpose of improving the detection accuracy, and the gas source, the pressure regulating valve, the second pressure regulating device and the cylinder are sequentially connected through the gas conveying pipeline to form a, the power output gas circuit is used for providing ejection power for the cylinder, and the second pressure regulating device can regulate the gas pressure of the power output gas circuit, so that the working efficiency of the cylinder is higher. Further, make power take off gas circuit and detect and to carry out swing joint between the gas circuit, specifically, make and realize swing joint between cylinder and the hydrovalve, realize swing joint between hydrovalve and the detection frock, can make hydrovalve and cylinder, the mounting structure who detects between the frock can be dismantled, this cylinder can drive the hydrovalve and remove to detection frock department and realize swing joint, and then can realize detecting the hydrovalve, utilize first regulator to adjust the gas pressure that detects the gas circuit, can help improving the precision that detects, thereby help improving the efficiency that detects.
(2) According to the method for detecting the internal leakage of the hydraulic valve, the sum of the pressure changes of the pressure transmitter on the first detection branch and the pressure transmitter on the third detection branch is compared with the pressure value of the pressure transmitter on the second detection branch, whether the pressure changes are equal to each other is judged, a conclusion a is obtained, the sum of the pressure changes of the pressure transmitter on the fifth detection branch and the pressure transmitter on the sixth detection branch is compared with the pressure value of the pressure transmitter on the fourth detection branch, whether the pressure changes are equal to each other is judged, a conclusion b is obtained, the hydraulic valve is preliminarily judged according to the conclusion a and the conclusion b, and the working efficiency and the detection accuracy are improved.
Drawings
FIG. 1 is a schematic diagram of the internal leakage detection device of a hydraulic valve according to the present invention;
in the figure: 1. a gas source; 2. a pressure regulating valve; 3. a first pressure regulating device; 4. detecting a tool; 5. a second pressure regulating device; 6. a cylinder; 41. a first detection port; 42. a second detection port; 43. a third detection port; 44. a fourth detection port; 45. a fifth detection port; 46. a sixth detection port; 31. a first solenoid valve; 32. a pressure transmitter; 33. a micro gas tank; 61. a piston rod; 62. a first drive chamber; 63. a second drive chamber; 51. a second solenoid valve; 52. a throttle valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
As shown in fig. 1, the internal leakage detection device of hydraulic valve, including air supply 1, the air-vent valve 2, the cylinder manifold, a first pressure regulating device 3 for improving the precision of detection, be used for with hydraulic valve swing joint's detection frock 4, second pressure regulating device 5 with be used for driving the hydraulic valve to remove to the cylinder 6 that detects 4 departments of frock and realize the connection, air supply 1, the air-vent valve 2, the cylinder manifold, connect gradually through gas transmission pipeline between first pressure regulating device 3 and the detection frock 4 and form the detection gas circuit, air supply 1 and air-vent valve 2, second pressure regulating device 5, connect gradually through gas transmission pipeline between the cylinder 6 and form the power take off gas circuit, swing joint between power take off gas circuit and the detection gas circuit.
As shown in fig. 1, the hydraulic valve internal leakage detection device in this embodiment includes a gas source 1, a pressure regulating valve 2, a confluence plate, a first pressure regulating device 3, a detection tool 4, a second pressure regulating device 5 and a cylinder 6, wherein the detection tool 4 is used for being movably connected with a hydraulic valve, so that the gas source 1, the pressure regulating valve 2, the confluence plate, the first pressure regulating device 3 and the detection tool 4 are sequentially connected through a gas conveying pipeline to form a detection gas circuit, gas from the gas source 1 is sequentially conveyed to the pressure regulating valve 2, the confluence plate, the first pressure regulating device 3 and the detection tool 4 through the gas conveying pipeline, the pressure regulating valve 2 can regulate gas pressure of the gas, the first pressure regulating device 3 further regulates gas pressure of the gas flowing out of the confluence plate, and the regulated gas enters the detection tool 4 to achieve the purpose of improving detection accuracy, so that the gas source 1 and the pressure regulating valve 2, The second pressure regulating device 5 and the cylinder 6 are sequentially connected through a gas conveying pipeline to form a power output gas circuit, the power output gas circuit is used for providing ejection power for the cylinder 6, and the second pressure regulating device 5 can regulate the gas pressure of the power output gas circuit, so that the working efficiency of the cylinder 6 is higher. Further, the power output gas circuit and the detection gas circuit can be movably connected, specifically, the hydraulic valve in the invention is a 20-type or 28-type hydraulic valve, the cylinder 6 and the hydraulic valve are movably connected, the hydraulic valve and the detection tool 4 are movably connected, the hydraulic valve and the cylinder 6 and the mounting structure between the detection tools 4 can be detached, the cylinder 6 can drive the hydraulic valve to move to the position of the detection tool 4 to realize movable connection, further, the hydraulic valve can be detected, the gas pressure of the detection gas circuit is adjusted by using the first pressure adjusting device 3, the detection precision can be improved, and the detection efficiency can be improved.
As shown in fig. 1, specifically, the detection tool 4 is provided with a first detection port 41, a second detection port 42, a third detection port 43, a fourth detection port 44, a fifth detection port 45 and a sixth detection port 46, the hydraulic valve is provided with FL port, F port, FR port, R port, RL port and RR port, the second detection port and the fourth detection port are respectively positioned on the left and right sides of the surface of the hydraulic valve, the first detection port and the third detection port are respectively arranged below the second detection port, similarly, the fifth detection port and the sixth detection port are respectively arranged below the fourth detection port, the FL port, F port, FR port, R port, RL port and RR port are respectively corresponding to the first detection port 41, the second detection port 42, the third detection port 43, the fourth detection port 44, the fifth detection port 45 and the sixth detection port 46, and the FL port, F port, FR port, R port, RL port and RR port are respectively sleeved with a ring for assembly connection, the sealing performance of the assembly structure is improved, the FL port, the F port, the FR port, the R port, the RL port and the RR port are inserted into the first detection port 41, the second detection port 42, the third detection port 43, the fourth detection port 44, the fifth detection port 45 and the sixth detection port 46 correspondingly, the movable connection is realized, the F port is communicated with the FL port and the FR port respectively, the R port is communicated with the RL port and the RR port respectively, the gas communication is realized, and the detection accuracy is improved.
As shown in fig. 1, as a preferred embodiment of the present embodiment, the first voltage regulating device 3 includes a plurality of voltage regulating assemblies, the number of the voltage regulating assemblies is set to six, and further, each voltage regulating assembly is connected to the first detecting port 41, the second detecting port 42, the third detecting port 43, the fourth detecting port 44, the fifth detecting port 45, and the sixth detecting port 46, respectively, so as to form a first detecting branch, a second detecting branch, a third detecting branch, a fourth detecting branch, a fifth detecting branch, and a sixth detecting branch. It is worth mentioning that, the pressure regulating subassembly is including the first solenoid valve 31 that is used for being connected with the PLC controller, pressure transmitter 32 and the miniature gas pitcher 33 that is used for improving gas pressure's stability, this first solenoid valve 31 is connected with the PLC controller, first solenoid valve 31, connect gradually between pressure transmitter 32 and the miniature gas pitcher 33, make first solenoid valve 31 be connected with the gas outlet one-to-one of cylinder manifold, miniature gas pitcher 33 respectively with first detection port 41, the second detects mouth 42, the third detects mouth 43, the fourth detects mouth 44, the fifth detects mouth 45, the sixth detects the mouth 46 and connects, can utilize miniature gas pitcher 33 air feed to make first detection branch road, the second detects the branch road, the third detects the branch road, the fourth detects the branch road, the gas pressure in fifth detection branch road and the sixth detection branch road reaches stable purpose.
As shown in fig. 1, it is emphasized that a piston rod 61 and an inner cavity are provided in the cylinder 6, a hydraulic valve is mounted on the piston rod 61, and the hydraulic valve can move synchronously with the piston rod 61, so that the piston rod 61 is disposed in the inner cavity, and the piston rod 61 is slidably connected with the inner cavity, further, a first driving chamber 62 and a second driving chamber 63 are formed between the piston rod 61 and the inner cavity, and further, the first driving chamber 62 and the second driving chamber 63 are respectively located at two sides of the piston rod 61.
As shown in fig. 1, more specifically, the second pressure regulating device 5 includes a second electromagnetic valve 51 and a throttle valve 52 for connection with a PLC controller, and the connection between the second electromagnetic valve 51 and the pressure regulating valve 2 is realized by a gas transmission pipe. In this embodiment, the number of the throttle valves 52 is set to two, so that a first gas branch and a second gas branch are respectively formed between the two throttle valves 52 and the second electromagnetic valve 51, further, the two throttle valves 52 are respectively connected with the first driving chamber 62 and the second driving chamber 63, so that the first gas branch is communicated with the first driving chamber 62, the second gas branch is communicated with the second driving chamber 63, the two throttle valves 52 respectively adjust the gas pressure of the first gas branch and the second gas branch, and sufficient gas enters the first driving chamber 62 or the second driving chamber 63, so that the piston rod 61 obtains sufficient power. When the gas of the first gas branch is conveyed to the first driving chamber 62, the gas enters the first driving chamber 62 to enable the piston rod 61 to move in the direction away from the detection tool 4, and the hydraulic valve moves synchronously along with the piston rod 61 to enable the hydraulic valve to be separated from the detection tool 4; when the gas of the second gas branch is conveyed to the second driving chamber 63, the gas enters the second driving chamber 63 to enable the piston rod 61 to move towards the direction close to the detection tool 4, and the hydraulic valve moves synchronously along with the piston rod 61 to enable the hydraulic valve to be connected with the detection tool 4.
As shown in fig. 1, the present embodiment also provides a method for detecting a leak in a hydraulic valve, including the steps of,
the installation step: the hydraulic valve is connected with the detection tool 4.
The PLC controller is adopted to control the second electromagnetic valve 51 to work, the second electromagnetic valve 51 is opened, the gas flowing out of the gas source 1 enters the second electromagnetic valve 51, so that the second gas branch generates gas, the liquid valve is movably arranged on the piston rod 61, the gas enters the second driving chamber 63 to enable the piston rod 61 to move towards the direction close to the detection tool 4, therefore, the FL port, the F port, the FR port, the R port, the RL port, and the RR port of the hydraulic valve are respectively connected with the first detection port 41, the second detection port 42, the third detection port 43, the fourth detection port 44, the fifth detection port 45, and the sixth detection port 46 on the detection tool 4 in a one-to-one correspondence manner, and the FL port, the F port, the FR port, the R port, the RL port, and the RR port are inserted into the first detection port 41, the second detection port 42, the third detection port 43, the fourth detection port 44, the fifth detection port 45, and the sixth detection port 46 in a one-to-one correspondence manner, so that the hydraulic valve is connected with the detection tool 4.
And (B) detection step A: the pressure transducer 32 is sensed to determine if the hydraulic valve is venting properly.
The PLC controller controls the first electromagnetic valve 31 on the second detection branch to work, so that the first electromagnetic valve 31 on the second detection branch is opened, the gas enters the second detection branch, the gas enters the F port corresponding to the gas through the second detection port 42, and then the gas can enter the hydraulic valve, so that the first detection port 41 and the third detection port 43 are opened, the F port is respectively communicated with the FL port and the FR port, so that the gas can enter the first detection port 41 and the third detection port 43 from the FL port and the FR port, the gas enters the pressure transmitter 32 on the first detection branch through the first detection port 41, the pressure value of the pressure transmitter 32 on the first detection branch is detected, the gas enters the pressure transmitter 32 on the third detection branch through the third detection port 43, the pressure value of the pressure transmitter 32 on the third detection branch is detected, and then the sum of the pressure changes of the pressure transmitter 32 on the first detection branch and the pressure transmitter 32 on the third detection branch and the pressure change on the second detection branch are transmitted to the second detection branch The pressure values of the device 32 are compared to judge whether the two values are equal to each other, and then a conclusion a is obtained.
As shown in fig. 1, the PLC controller controls the first electromagnetic valve 31 on the fourth detection branch to operate, so that the first electromagnetic valve 31 on the fourth detection branch is opened, the gas enters the fourth detection branch, the gas enters the R port corresponding to the fourth detection port 44 through the fourth detection port, so that the gas can enter the hydraulic valve, the fifth detection port 45 and the sixth detection port 46 are opened, the R port is respectively communicated with the RL port and the RR port, so that the gas can enter the fifth detection port 45 and the sixth detection port 46 from the RL port and the RR port, the gas enters the pressure transmitter 32 on the fifth detection branch through the fifth detection port 45, the pressure value of the pressure transmitter 32 on the fifth detection branch is detected, the gas enters the pressure transmitter 32 on the sixth detection branch through the sixth detection port 46, the pressure value of the pressure transmitter 32 on the sixth detection branch is detected, and then the sum of the pressure changes of the pressure transmitters 32 on the fifth detection branch and the sixth detection branch and the fourth detection branch is added to the pressure transmitter 32 on the fourth detection branch The pressure values of the upper pressure transmitter 32 are compared to judge whether the two values are equal to each other, and a conclusion b is reached.
As shown in fig. 1, if the conclusion a and the conclusion b are equal, it is initially obtained that the ventilation of the first detection branch, the second detection branch, the third detection branch, the fourth detection branch, the fifth detection branch and the sixth detection branch is normal, and the detection of the hydraulic valve is qualified. If the conclusion a and the conclusion b are unequal, the first detection branch, the second detection branch, the third detection branch, the fourth detection branch, the fifth detection branch and the sixth detection branch are judged to be abnormal in ventilation preliminarily, and the hydraulic valve is detected unqualifiedly. Or the conclusion a is unequal and the conclusion b is equal, the ventilation of the first detection branch, the second detection branch and the third detection branch is judged to be abnormal preliminarily, and the hydraulic valve is detected to be unqualified. Or the conclusion a is equal and the conclusion b is unequal, the ventilation of the fourth detection branch, the fifth detection branch and the sixth detection branch is judged to be abnormal preliminarily, and the hydraulic valve is detected to be unqualified. The preliminary judgment is carried out firstly, and the improvement of the working efficiency and the detection accuracy are facilitated.
As shown in fig. 1, in order to make the detection conclusion more accurate and make the detection efficiency more efficient, further, after the detection step a, the method further includes:
as shown in fig. 1, the detection step B: the PLC controller controls the first electromagnetic valve 31 on the first detection branch to work, the first electromagnetic valve 31 on the first detection branch is opened, gas enters the first detection branch, the gas enters the FL port corresponding to the first detection port 41 through the first detection port, so that the gas can enter the hydraulic valve, the FL port is communicated with the F port, so that the second detection port 42 is opened, the gas enters the pressure transmitter 32 on the second detection branch through the second detection port 42, the pressure value of the pressure transmitter 32 on the second detection branch is detected, the pressure values of the pressure transmitter 32 on the second detection branch and the pressure transmitter 32 on the first detection branch are compared, and whether the two values are equal or not is judged to obtain a conclusion c.
As shown in fig. 1, the PLC controller controls the first electromagnetic valve 31 on the fifth detection branch to work, the first electromagnetic valve 31 on the fifth detection branch is opened, the gas enters the fifth detection branch, the gas enters the RL port corresponding to the fifth detection port 45 through the fifth detection port, and then the gas can enter the hydraulic valve, because the RL port is communicated with the R port, the fourth detection port 44 is opened, the gas enters the pressure transmitter 32 on the fourth detection branch through the fourth detection port 44, the pressure value of the pressure transmitter 32 on the fourth detection branch is detected, the pressure values of the pressure transmitter 32 on the fourth detection branch and the pressure transmitter 32 on the fifth detection branch are compared, and whether the two values are equal or not is determined to obtain the conclusion d.
As shown in fig. 1, the PLC controller controls the first electromagnetic valve 31 on the third detection branch to work, the first electromagnetic valve 31 on the third detection branch is opened, so that the third detection branch can introduce gas, the gas enters the FR port corresponding to the third detection port 43 through the third detection port, so that the gas enters the hydraulic valve, because the FR port is communicated with the F port, the second detection port 42 is in an open state, the gas enters the pressure transmitter 32 on the second detection branch through the second detection port 42, the pressure value of the pressure transmitter 32 on the second detection branch is detected, the pressure values of the pressure transmitter 32 on the second detection branch and the pressure transmitter 32 on the third detection branch are compared, and whether the two are equal or not is determined to obtain the conclusion e.
As shown in fig. 1, the PLC controller controls the first electromagnetic valve 31 on the sixth detection branch to operate, the first electromagnetic valve 31 on the sixth detection branch is opened, gas is introduced into the sixth detection branch, the gas enters the RR port corresponding thereto through the sixth detection port 46, the gas enters the hydraulic valve, because the RR port is communicated with the R port, the fourth detection port 44 is opened, the gas enters the pressure transmitter 32 on the fourth detection branch through the fourth detection port 44, the pressure value of the pressure transmitter 32 on the fourth detection branch is detected, and then the pressure values of the pressure transmitter 32 on the fourth detection branch and the pressure transmitter 32 on the sixth detection branch are compared to determine whether the two pressure values are equal to obtain the conclusion f.
As shown in fig. 1, on the basis of the above structure, if the conclusion a, the conclusion b, the conclusion c, the conclusion d, the conclusion e and the conclusion f all meet the set requirements, and the conclusions are equal, the PLC controller outputs a qualified signal and turns on a green light; if any one of the conclusion a, the conclusion b, the conclusion c, the conclusion d, the conclusion e and the conclusion f does not meet the set requirement, namely, any one of the conclusions is unequal, the PLC outputs unqualified results, the red light is turned on, an alarm is given, the detection tool 4 is automatically locked, and the detection tool can be used only by manual unlocking, so that the detection accuracy and efficiency can be improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (7)
1. The internal leakage detection device of the hydraulic valve is characterized in that: the hydraulic valve detection device comprises an air source, a pressure regulating valve, a confluence plate, a first pressure regulating device for improving detection accuracy, a detection tool for being movably connected with a hydraulic valve, a second pressure regulating device and an air cylinder for driving the hydraulic valve to move towards a direction close to or far away from the detection tool, wherein the air source, the pressure regulating valve, the confluence plate, the first pressure regulating device and the detection tool are sequentially connected through an air conveying pipeline to form a detection air path, the air source, the pressure regulating valve, the second pressure regulating device and the air cylinder are sequentially connected through an air conveying pipeline to form a power output air path, and the power output air path is movably connected with the detection air path;
the detection tool is provided with a first detection port, a second detection port, a third detection port, a fourth detection port, a fifth detection port and a sixth detection port, the second detection port and the fourth detection port are respectively positioned on two sides of the detection tool, the first detection port and the third detection port are respectively arranged below the second detection port, the fifth detection port and the sixth detection port are respectively arranged below the fourth detection port, and the first detection port, the second detection port, the third detection port, the fourth detection port, the fifth detection port and the sixth detection port are used for being in one-to-one correspondence and movable connection with the FL port, the F port, the FR port, the R port, the RL port and the RR port.
2. The hydraulic valve internal leak detection device of claim 1, wherein: the first pressure regulating device comprises a plurality of pressure regulating components, the number of the pressure regulating components is six, each pressure regulating component is respectively connected with the first detection port, the second detection port, the third detection port, the fourth detection port, the fifth detection port and the sixth detection port to form a first detection branch, a second detection branch, a third detection branch, a fourth detection branch, a fifth detection branch and a sixth detection branch, the pressure regulating component comprises a first electromagnetic valve connected with the PLC, a pressure transmitter and a miniature gas tank for improving the stability of gas pressure, the first electromagnetic valve, the pressure transmitter and the micro gas tank are connected in sequence, the first electromagnetic valve is connected with the gas outlet of the confluence plate, the miniature gas tank is respectively connected with the first detection port, the second detection port, the third detection port, the fourth detection port, the fifth detection port and the sixth detection port.
3. The hydraulic valve internal leak detection device of claim 1, wherein: the hydraulic cylinder is characterized in that a piston rod and an inner cavity which are movably connected with a hydraulic valve are arranged in the cylinder, the piston rod is arranged in the inner cavity and is in sliding connection with the inner cavity, a first driving cavity and a second driving cavity are formed between the piston rod and the inner cavity, and the first driving cavity and the second driving cavity are respectively located on two sides of the piston rod.
4. The hydraulic valve internal leak detection device of claim 3, wherein: the second pressure regulating device comprises a second electromagnetic valve and a throttle valve, the second electromagnetic valve is connected with the pressure regulating valve, the number of the throttle valves is two, a first gas branch and a second gas branch are formed between the two throttle valves and the second electromagnetic valve respectively, the two throttle valves are connected with a first driving cavity and a second driving cavity respectively, the first gas branch is communicated with the first driving cavity, and the second gas branch is communicated with the second driving cavity.
5. Method for detecting leaks in hydraulic valves using the device according to any one of claims 1 to 4, characterized in that: comprises the following steps of (a) carrying out,
the installation step: the hydraulic valve is connected with the detection tool;
first pressure regulating device includes a plurality of pressure regulating subassemblies, the pressure regulating subassembly is including being used for first solenoid valve, the pressure transmitter be connected with the PLC controller and being used for improving the miniature gas pitcher of gas pressure's stability, second pressure regulating device is including being used for second solenoid valve and the choke valve be connected with the PLC controller, the second solenoid valve is connected with the air-vent valve, the quantity of choke valve sets up to two, forms first gas branch road and second gas branch road between two choke valves and the second solenoid valve respectively, the work of PLC controller control second solenoid valve, the gaseous branch road of second produces gas, with liquid valve movable mounting on the piston rod, the piston rod is toward the direction removal that is close to the detection frock, will first detection mouth, second detection mouth, third detection mouth, fourth detection mouth, fifth detection mouth, sixth detection mouth and FL mouth, The port F, the port FR, the port R, the port RL and the port RR are connected in a one-to-one correspondence manner;
and (B) detection step A: detecting the pressure transmitter, and detecting whether the hydraulic valve is ventilated normally;
the PLC controller controls a first electromagnetic valve on a second detection branch to work, gas is introduced into the second detection branch, the gas enters an F port corresponding to the second detection branch through a second detection port, the gas enters a hydraulic valve, a first detection port and a third detection port are opened, the gas enters a pressure transmitter on the first detection branch through the first detection port, the gas enters a pressure transmitter on the third detection branch through the third detection port, the sum of pressure changes of the pressure transmitter on the first detection branch and the pressure transmitter on the third detection branch is compared with the pressure value of the pressure transmitter on the second detection branch, and whether the pressure changes are equal to each other or not is judged to obtain a conclusion a;
the PLC controls a first electromagnetic valve on a fourth detection branch to work, gas is introduced into the fourth detection branch, the gas enters an R port corresponding to the fourth detection branch through a fourth detection port, the gas enters a hydraulic valve, a fifth detection port and a sixth detection port are opened, the gas enters a pressure transmitter on a fifth detection branch through a fifth detection port, the gas enters a pressure transmitter on a sixth detection branch through the sixth detection port, the sum of pressure changes of the pressure transmitter on the fifth detection branch and the pressure transmitter on the sixth detection branch is compared with the pressure value of the pressure transmitter on the fourth detection branch, and whether the pressure changes are equal to each other or not is judged to obtain a conclusion b;
and according to the conclusion a and the conclusion b, whether the ventilation of the first detection branch, the second detection branch, the third detection branch, the fourth detection branch, the fifth detection branch and the sixth detection branch is normal is detected.
6. The method of detecting internal leakage of a hydraulic valve of claim 5, further comprising, after the detecting step a:
and B, detection: the PLC controls a first electromagnetic valve on a first detection branch to work, gas is introduced into the first detection branch, the gas enters an FL port corresponding to the first detection branch through a first detection port, the gas enters a hydraulic valve, a second detection port is opened, the gas enters a pressure transmitter on a second detection branch through a second detection port, the pressure values of the pressure transmitter on the second detection branch and the pressure transmitter on the first detection branch are compared, and whether the pressure values are equal to each other or not is judged to obtain a conclusion c;
the PLC controls a first electromagnetic valve on a fifth detection branch to work, gas is introduced into the fifth detection branch, the gas enters a RL port corresponding to the fifth detection port through the fifth detection port, the gas enters a hydraulic valve, a fourth detection port is opened, the gas enters a pressure transmitter on a fourth detection branch through the fourth detection port, the pressure values of the pressure transmitter on the fourth detection branch and the pressure transmitter on the fifth detection branch are compared, and whether the pressure values are equal to each other or not is judged to obtain a conclusion d;
the PLC controls a first electromagnetic valve on a third detection branch to work, gas is introduced into the third detection branch, the gas enters an FR port corresponding to the third detection branch through a third detection port, the gas enters a hydraulic valve, a second detection port is opened, the gas enters a pressure transmitter on the second detection branch through the second detection port, the pressure values of the pressure transmitter on the second detection branch and the pressure transmitter on the third detection branch are compared, and whether the pressure values are equal to each other or not is judged to obtain a conclusion e;
the PLC controller controls a first electromagnetic valve on a sixth detection branch to work, the sixth detection branch is filled with gas, the gas enters an RR port corresponding to the sixth detection port through the sixth detection port, the gas enters a hydraulic valve, the fourth detection port is opened, the gas enters a pressure transmitter on the fourth detection branch through the fourth detection port, the pressure values of the pressure transmitter on the fourth detection branch and the pressure transmitter on the sixth detection branch are compared, and whether the pressure transmitter and the pressure transmitter are equal or not is judged to obtain a conclusion f.
7. The hydraulic valve internal leak detection method of claim 6, wherein: if the conclusion a, the conclusion b, the conclusion c, the conclusion d, the conclusion e and the conclusion f all meet the set requirements, the PLC controller outputs the qualified light and turns on a green light; and if any one of the conclusion a, the conclusion b, the conclusion c, the conclusion d, the conclusion e and the conclusion f does not meet the set requirement, the PLC outputs unqualified results, the red light is lightened, the alarm is given, and the detection tool is automatically locked.
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| JP2007101348A (en) * | 2005-10-04 | 2007-04-19 | Japan Organo Co Ltd | Valve leakage detecting method and device thereof |
| CN204495519U (en) * | 2015-01-28 | 2015-07-22 | 珠海格力电器股份有限公司 | The leak detection system of safety valve |
| CN105651469A (en) * | 2015-12-30 | 2016-06-08 | 慈溪市天行电器有限公司 | Automatic leakage testing method for proportional valve |
| CN206300753U (en) * | 2016-12-20 | 2017-07-04 | 河南省电力勘测设计院 | A kind of high pressure bypass valve inner hexagon system |
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| US9933327B2 (en) * | 2015-08-20 | 2018-04-03 | General Electric Company | Method for detecting leaks in a fuel circuit of a gas turbine fuel supply system |
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| JP2007101348A (en) * | 2005-10-04 | 2007-04-19 | Japan Organo Co Ltd | Valve leakage detecting method and device thereof |
| CN204495519U (en) * | 2015-01-28 | 2015-07-22 | 珠海格力电器股份有限公司 | The leak detection system of safety valve |
| CN105651469A (en) * | 2015-12-30 | 2016-06-08 | 慈溪市天行电器有限公司 | Automatic leakage testing method for proportional valve |
| CN206300753U (en) * | 2016-12-20 | 2017-07-04 | 河南省电力勘测设计院 | A kind of high pressure bypass valve inner hexagon system |
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