CN111677719B - Automatic test system and method for electromagnetic directional valve - Google Patents
Automatic test system and method for electromagnetic directional valve Download PDFInfo
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- CN111677719B CN111677719B CN202010561128.0A CN202010561128A CN111677719B CN 111677719 B CN111677719 B CN 111677719B CN 202010561128 A CN202010561128 A CN 202010561128A CN 111677719 B CN111677719 B CN 111677719B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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Abstract
The invention provides an automatic test system and method for an electromagnetic directional valve.A controller controls the overflow pressure value of a first digital overflow valve to be smaller than the preset detection pressure value of a tested valve; the controller controls the working states of the tested valve, the first digital overflow valve and the flow regulating assembly to circulate in a first test stage and a second test stage; the controller controls the tested valve to be closed at the first testing stage, simultaneously controls the flow regulating assembly to supply liquid to the liquid inlet of the tested valve, and closes the flow regulating valve when the pressure value of the liquid inlet of the tested valve detected by the first pressure sensor is the same as the preset detection pressure value; the controller controls the tested valve to be opened in the second test stage so that the medium overflows through the first digital overflow valve. The scheme can realize automatic flow control and automatic pressure adjustment in the test process of the electromagnetic directional valve, solves the problems of low automation degree and complex operation of a hydraulic system of the electromagnetic directional valve in the prior art, and realizes remote automatic detection of the electromagnetic directional valve.
Description
Technical Field
The invention relates to the technical field of hydraulic control, in particular to an automatic test system and method for an electromagnetic directional valve.
Background
The application of the electromagnetic directional valve is wider and wider, and the requirement on the performance of the electromagnetic directional valve is higher and higher, so the detection of the electromagnetic directional valve is important. In the detection process of the electromagnetic directional valve, the passing flow of the tested valve needs to be adjusted to the nominal flow, and then all indexes of the tested valve are checked. In the prior art, methods for adjusting the flow rate of a tested valve mainly include two methods:
(1) selecting a quantitative pump and matching with a flow distribution valve to adjust the flow passing through the tested valve; (2) a variable displacement pump was selected to directly regulate the flow through the valve under test. Both of the above two approaches have certain problems: the quantitative pump is provided with a flow valve, so that the control precision is low and the automation operability is poor; the variable pump has the disadvantages of high cost and poor automation operability. Therefore, the flow regulation schemes in the electromagnetic directional valve test system in the prior art have the defect of poor automation operability.
Disclosure of Invention
The invention aims to provide an automatic test system and method for an electromagnetic directional valve, which can realize remote automatic operation on the premise of ensuring the precision and reducing the cost in the test process of the electromagnetic directional valve.
Therefore, the invention provides an automatic test system of an electromagnetic directional valve, which comprises:
the controller is connected with the control end of the tested valve and is used for controlling the tested valve to close or open;
the input end of the flow regulating component is connected with the output end of the medium source, the output end of the flow regulating component is connected with the liquid inlet of the tested valve, and the controlled end of the flow regulating component is connected with the output end of the controller;
the first pressure sensor is arranged at the liquid inlet of the tested valve and used for detecting the pressure value at the liquid inlet of the tested valve and sending the pressure value to the controller;
the liquid inlet end of the first digital overflow valve is connected with the working port of the tested valve, and the controlled end of the first digital overflow valve is connected with the output end of the controller;
the controller controls the overflow pressure value of the first digital overflow valve to be smaller than the preset detection pressure value of the tested valve; the controller controls the working states of the tested valve, the first digital overflow valve and the flow regulating assembly to circulate in a first test stage and a second test stage; in a first test stage, the controller controls the tested valve to be closed, controls the flow regulating assembly to supply liquid to the liquid inlet of the tested valve, and closes the flow regulating assembly when the pressure value of the liquid inlet of the tested valve, detected by the first pressure sensor, is the same as the preset detection pressure value; and the controller controls the tested valve to be opened in a second test stage so as to enable the medium to overflow through the first digital overflow valve.
Optionally, the above automatic test system for an electromagnetic directional valve further includes:
and the second pressure sensor is arranged at the working port of the tested valve and used for detecting the pressure value at the working port of the tested valve and sending the pressure value to the controller.
Optionally, the above automatic test system for an electromagnetic directional valve further includes:
the second digital overflow valve is arranged between the output end of the flow regulating component and the liquid inlet of the tested valve, and the controlled end of the second digital overflow valve is connected with the output end of the controller;
and the controller controls the overflow pressure value of the second digital overflow valve to be larger than the preset detection pressure value.
Optionally, the above automatic test system for an electromagnetic directional valve further includes:
the liquid inlet end of the third digital overflow valve is communicated with the connecting point of the input end of the flow regulating component and the output end of the medium source; the controlled end of the controller is connected with the output end of the controller;
and the controller controls the overflow pressure value of the third digital overflow valve to be greater than the preset detection pressure value.
Optionally, in the automatic test system for an electromagnetic directional valve, the first digital overflow valve, the second digital overflow valve, and the third digital overflow valve include:
a valve body;
the valve core is arranged inside the valve body;
the elastic piece is arranged in the valve body, and one end of the elastic piece is connected with the valve core;
the valve rod is arranged in the valve body, and one end of the valve rod is connected with the other end of the elastic piece;
the linear stepping motor is arranged outside the valve body, and the driving output end of the linear stepping motor is connected with the other end of the valve rod; the controlled end of the linear stepping motor is connected with the output end of the controller, and the length of the extending part of the motor driving output end is adjusted under the control of the controller so as to adjust the overflow pressure value.
Optionally, in the automatic test system for a solenoid directional valve described above, the flow regulating assembly includes a first flow regulating component and a second flow regulating component:
the first flow regulating component comprises a first electric oil cylinder; the liquid inlet of the first electric oil cylinder is connected with the output end of the medium source through a first electric control valve, and the liquid outlet of the first electric oil cylinder is connected with the liquid inlet of the tested valve through a second electric control valve;
the second flow regulating component comprises a second electric oil cylinder; a liquid inlet of the second electric oil cylinder is connected with the output end of the medium source through a third electric control valve, and a liquid outlet of the second electric oil cylinder is connected with a liquid inlet of the tested valve through a fourth electric control valve;
the controlled end of the first electric oil cylinder, the controlled end of the second electric oil cylinder, the controlled end of the first electric control valve, the controlled end of the second electric control valve, the controlled end of the third electric control valve and the controlled end of the fourth electric control valve are all connected with the output end of the controller;
the controller controls the on-off periods of the first electric control valve and the second electric control valve to alternate with the on-off periods of the third electric control valve and the fourth electric control valve; the controller controls the action frequency of the first electric oil cylinder to be the same as that of the second electric oil cylinder.
Optionally, in the automatic test system for an electromagnetic directional valve, the first electric cylinder and the second electric cylinder each include:
a cylinder body;
a piston rod disposed within the cylinder;
the screw rod is arranged in the cylinder body, and one end of the screw rod is connected with the end part of the piston rod;
the stepping motor is positioned outside the cylinder body, and the driving output end of the stepping motor is connected with the other end of the lead screw; the controlled end of the stepping motor is connected with the output end of the controller, and the speed of the motor is adjusted under the control of the controller so as to adjust the medium flow.
Optionally, the above automatic test system for an electromagnetic directional valve further includes:
the third pressure sensor is arranged at the liquid outlet of the first electric oil cylinder, detects the pressure value at the liquid outlet of the first electric oil cylinder and sends the pressure value to the controller;
the fourth pressure sensor is arranged at the liquid outlet of the second electric oil cylinder, detects the pressure value at the liquid outlet of the second electric oil cylinder and sends the pressure value to the controller;
and the controller determines a flow resistance characteristic test result of the tested valve according to the pressure values sent by the third pressure sensor and the fourth pressure sensor.
Optionally, the above automatic test system for an electromagnetic directional valve further includes:
the flow sensor is arranged between the flow adjusting assembly and the liquid inlet of the tested valve, and detects a flow value entering the liquid inlet of the tested valve and sends the flow value to the controller.
The invention also provides a test method for testing the tested valve based on the automatic test system for the electromagnetic directional valve, which is characterized in that after the tested valve is determined, the flow regulating assembly is assembled between the output end of the medium source and the liquid inlet of the tested valve; arranging a first pressure sensor at an inlet of the tested valve; a first digital overflow valve is arranged at a working port of the tested valve; and inputting the nominal pressure value, the nominal flow value and the preset detection pressure value of the tested valve into the controller for storage.
Compared with the prior art, the technical scheme provided by the embodiment of the invention at least has the following beneficial effects:
the invention provides an automatic test system and method for an electromagnetic directional valve.A controller controls the overflow pressure value of a first digital overflow valve to be smaller than the preset detection pressure value of a tested valve; the controller controls the working states of the tested valve, the first digital overflow valve and the flow regulating assembly to circulate in a first test stage and a second test stage; the controller controls the tested valve to be closed at the first testing stage, simultaneously controls the flow regulating assembly to supply liquid to the liquid inlet of the tested valve, and closes the flow regulating valve when the pressure value of the liquid inlet of the tested valve detected by the first pressure sensor is the same as the preset detection pressure value; the controller controls the tested valve to be opened in the second test stage so that the medium overflows through the first digital overflow valve. The scheme can realize automatic flow control and automatic pressure adjustment in the test process of the electromagnetic directional valve, solves the problems of low automation degree and complex operation of a hydraulic system of the electromagnetic directional valve in the prior art, and realizes remote automatic detection of the electromagnetic directional valve.
Drawings
Fig. 1 is a block diagram of an automatic test system for a solenoid directional valve according to an embodiment of the present invention;
fig. 2 is a block diagram of an automatic test system for a solenoid directional valve according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an electric cylinder according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a digital overflow valve according to an embodiment of the present invention;
fig. 5 is a block diagram of an electrical control portion of an automatic test system for an electromagnetic directional valve according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or assembly referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical schemes in the following embodiments provided by the invention can be combined with each other unless contradictory to each other, and technical features in different schemes can be replaced with each other.
As shown in fig. 1, the present embodiment provides an automatic testing system for an electromagnetic directional valve, which includes a controller 101, a flow regulating assembly 102, a first pressure sensor 103 and a first digital overflow valve 104, wherein the medium source includes a pump source 105 and a motor 106 connected to a liquid collecting tank, and wherein, as shown in fig. 5:
the controller 101 is connected with the control end of the tested valve 200 and is used for controlling the tested valve 200 to close or open; the input end of the flow regulating component 102 is connected with the output end of the pump source 105, the output end of the flow regulating component is connected with the liquid inlet of the tested valve 200, and the controlled end of the flow regulating component is connected with the output end of the controller 101; the first pressure sensor 103 is arranged at the liquid inlet of the tested valve 200, and is used for detecting the pressure value at the liquid inlet of the tested valve 200 and sending the pressure value to the controller 101; a first digital overflow valve 104, the liquid inlet end of which is connected with the working port of the tested valve 200, and the controlled end of which is connected with the output end of the controller 101; the controller 101 controls the overflow pressure value of the first digital overflow valve 104 to be smaller than the preset detection pressure value of the tested valve 200; the controller 101 controls the working states of the tested valve 200, the first digital overflow valve 104 and the flow regulating assembly 102 to cycle between a first test stage and a second test stage; in the first test stage, the controller 101 controls the tested valve 200 to be closed, and at the same time controls the flow regulating assembly 102 to supply liquid to the liquid inlet of the tested valve 200, and when the pressure value of the liquid inlet of the tested valve 200, which is detected by the first pressure sensor 103, is the same as the preset detected pressure value, the flow regulating assembly 102 is closed; the controller 101 controls the tested valve 200 to be opened in the second test stage so as to enable the medium to overflow through the first digital overflow valve 104.
The scheme can realize automatic flow control and automatic pressure adjustment of the tested valve 200 in the test process of the electromagnetic directional valve, solves the problems of low automation degree and complex operation of a hydraulic system of the electromagnetic directional valve in the prior art, and realizes remote automatic detection of the electromagnetic directional valve.
In the above scheme, as shown in fig. 2, the automatic test system for the electromagnetic directional valve may further include a second pressure sensor 108, which is disposed at the working port of the tested valve 200, and is configured to detect a pressure value at the working port of the tested valve 200 and send the pressure value to the controller 101. The second pressure sensor 108 can detect the pressure value at the outlet of the working port, and thus can determine whether the tested valve 200 is exhausted, so that the time node when the tested valve 200 enters the first test stage again can be controlled more accurately.
As shown in fig. 2, the system may further include a second digital overflow valve 107, which is disposed between the output end of the flow regulating assembly 102 and the inlet of the tested valve 200, and a controlled end of the second digital overflow valve is connected to the output end of the controller 101; the controller 101 controls the overflow pressure value of the second digital overflow valve 107 to be greater than the preset detection pressure value. Set up second digital overflow valve 107 and make the system overflow when the pressure value that can make the inlet of being tried valve 200 surpasss and predetermine the detection pressure value, release pressure to ensure that the being tried pressure of being tried valve 200 is the same with predetermineeing the detection pressure value, improve the test precision.
As shown, the flow rate adjustment assembly 101 in the above scheme may include a first flow rate adjustment component and a second flow rate adjustment component: the first flow rate adjusting part includes a first electric cylinder 109; a liquid inlet of the first electric oil cylinder 109 is connected with an output end of the medium source through a first electric control valve 111, and a liquid outlet of the first electric oil cylinder 109 is connected with a liquid inlet of the tested valve 200 through a second electric control valve 113; the second flow rate adjustment part includes a second electric cylinder 110; a liquid inlet of the second electric oil cylinder 110 is connected with an output end of the medium source through a third electric control valve 112, and a liquid outlet of the second electric oil cylinder 110 is connected with a liquid inlet of the tested valve 200 through a fourth electric control valve 114; the controlled end of the first electric cylinder 109, the controlled end of the second electric cylinder 110, the controlled end of the first electric control valve 111, the controlled end of the second electric control valve 113, the controlled end of the third electric control valve 112 and the controlled end of the fourth electric control valve 114 are all connected with the output end of the controller 102; the controller 101 controls the on-off periods of the first electronic control valve 111 and the second electronic control valve 113 to alternate with the on-off periods of the third electronic control valve 112 and the fourth electronic control valve 114; the controller 101 controls the operating frequencies of the first electric cylinder 109 and the second electric cylinder 110 to be the same. Namely, the first electric cylinder 109 and the second electric cylinder 110 are controlled to alternately supply liquid to the tested valve 200, so that the continuous liquid supply operation is realized.
As shown in fig. 3, each of the first electric cylinder 109 and the second electric cylinder 110 includes: a cylinder 23 including a liquid inlet and a liquid outlet; a piston rod 22 provided in the cylinder 23; a lead screw 21 disposed in the cylinder 23, one end of which is connected to an end of the piston rod 22; the stepping motor 20 is positioned outside the cylinder body 23, and the driving output end of the stepping motor is connected with the other end of the lead screw 21; the controlled end of the stepping motor 20 is connected with the output end of the controller 101, and the motor speed is adjusted under the control of the controller 101 to adjust the medium flow. The screw 21 converts the rotary motion into the linear motion of the piston rod 22, the liquid in the compression cylinder is discharged, the speed of the stepping motor 20 is controllable, the discharge capacity of the stepping motor is controllable, and the flow passing through the tested valve 200 is controllable.
The automatic test system for the electromagnetic directional valve in the above scheme may further include a third digital overflow valve 115, a liquid inlet end of which is communicated with a connection point between the input end of the flow regulating assembly 102 and the output end of the medium source; the controlled end of the controller is connected with the output end of the controller 101; the controller 101 controls the relief pressure value of the third digital relief valve 115 to be greater than the preset detection pressure value.
As shown in fig. 4, the first digital relief valve 104, the second digital relief valve 107, and the third digital relief valve 115 include: a valve body 32; a valve body 30 provided inside the valve body 32; an elastic member 31 provided inside the valve body 32, one end of which is connected to the valve body 30; a valve rod 33 provided inside the valve body 32, one end of which is connected to the other end of the elastic member 31; a linear stepping motor 34 disposed outside the valve body 32, and having a driving output end connected to the other end of the valve rod 33; the controlled end of the linear stepping motor 34 is connected with the output end of the controller 101, and the length of the extending part of the motor driving output end is adjusted under the control of the controller 101 so as to adjust the overflow pressure value.
In the above scheme, the automatic test system for the electromagnetic directional valve may further include: a third pressure sensor 117, disposed at the liquid outlet of the first electric cylinder 109, for detecting a pressure value at the liquid outlet of the first electric cylinder 109 and sending the pressure value to the controller 101; a fourth pressure sensor 116, disposed at the liquid outlet of the second electric cylinder 110, for detecting a pressure value at the liquid outlet of the second electric cylinder 110 and sending the pressure value to the controller 101; the controller 101 determines the result of the test of the flow resistance characteristic of the tested valve 200 according to the pressure values sent by the third pressure sensor 117 and the fourth pressure sensor 116. The flow pressure of the tested valve 200 can be adjusted through the digital overflow valve and can be remotely adjusted, and the performance of the tested valve 200 under different backpressure working conditions is realized.
The automatic test system for the electromagnetic directional valve may further include a flow sensor 118 disposed between the flow regulating assembly 102 and the liquid inlet of the tested valve 200, wherein the flow sensor 118 detects a flow value entering the liquid inlet of the tested valve 200 and sends the flow value to the controller 101. The controller 101 can control the flow regulating assembly based on the nominal flow of the valve under test and the actual flow detected by the flow sensor.
The embodiment also provides a test method for testing the tested valve by the automatic test system for the electromagnetic directional valve based on any scheme, and after the tested valve is determined, the flow regulating assembly is assembled between the output end of the medium source and the liquid inlet of the tested valve; arranging a first pressure sensor at an inlet of the tested valve; a first digital overflow valve is arranged at a working port of the tested valve; and inputting the nominal pressure value, the nominal flow value and the preset detection pressure value of the tested valve into the controller for storage.
The working principle is as follows:
1. and (3) testing the reversing performance:
a preparation stage: the pump source 1 is started, the controller 101 adjusts the relief pressure of the third digital relief valve 115 to be greater than the pressure to be tested of the tested valve 200 (if the reversing performance of the tested valve under the pressure of 6Mpa or 20Mpa needs to be tested, and the system pressure loss is considered, the opening pressure of the third digital relief valve 115 is set to be greater than the test pressure), the controller 101 controls the first electronic control valve 111 and the second electronic control valve 113 (or the third electronic control valve 112 and the fourth electronic control valve 114) to be opened through software of the controller 101, the relief is stopped through the second digital relief valve 107, the linear stepping motor of the second digital relief valve 1072 is controlled through software of the controller 101, and the relief pressure is adjusted to be the detection pressure of the tested valve 200.
And (3) a testing stage: closing the fourth electric control stop valve 114 through the controller 101, simultaneously opening the first electric control valve 111, filling liquid into the first electric oil cylinder 109 and the second electric oil cylinder 110, setting control pressure in the controller 101, and automatically closing the first electric control valve 111 and the third electric control valve 112 through the controller 101 when the data of the third pressure sensor 117 and the fourth pressure sensor 116 are greater than set values; at this time, according to the nominal flow of the tested valve 200 and the cylinder diameters of the first electric cylinder 109 and the second electric cylinder 110, a certain rotating speed is set for the stepping motor of the first electric cylinder 109, meanwhile, the fourth electric control valve 114 is opened, the rotating speed of the motor is converted into linear motion of the piston rod 22 through the lead screw 21, oil in the compression cylinder overflows through the second digital overflow valve 107, the inlet pressure of the tested valve 200 is kept at the pressure to be tested, the tested valve 200 is controlled to be opened through the controller 101, fluid overflows through the first digital overflow valve 104, the tested valve 200 is controlled to be closed after a certain time interval is controlled through the controller 101, the fluid overflows through the second digital overflow valve 107, and the operation is repeated in such a circulating way, and the reversing performance test of the tested valve 200 is carried out.
When the first electric cylinder 109 is about to drain the stored liquid (because the speed of the stepping motor is constant, the speed of the piston rod is constant, can be judged by time according to the length of the cylinder, and send a command to the linear motor of the second electric cylinder 110 to rotate at a speed equal to the speed of the stepping motor of the first electric cylinder 109, and simultaneously open the fourth electric control valve 114, close the second electric control valve 113, sending the recovery quality to the stepping motor of the first electric oil cylinder 109, opening the first electric control valve 111, filling the first electric oil cylinder 109, when the fourth pressure sensor 116 reaches the set value, the first electronic control valve 111 is closed, the step motor of the first electric cylinder 109 is stopped, the liquid filling is completed, when the liquid stored in the second electric cylinder 110 is about to drain, the second electro-hydraulic cylinder 110 is charged in the same manner and the first electro-hydraulic cylinder 109 is opened to supply fluid, ensuring a constant nominal flow of fluid through the tested valve 200.
The outlet pressure of the tested valve 200 can be adjusted through the first digital overflow valve 104, remote adjustment can be achieved, and the performance of the tested valve under different backpressure working conditions can be achieved. The flow resistance characteristics of the valve 200 under test at different pressures can be detected by the third pressure sensor 116 and the fourth pressure sensor 117. The advantages of this approach are: by adjusting the speed of the stepping motor, fluids with different flow rates can be provided, the control precision is high, and the test requirements of electromagnetic directional valves with different nominal flow rates are met; the stepping motor can realize remote automatic control, and the automation degree is high; the digital overflow valve realizes remote automatic adjustment of system pressure, and the automation degree is high;
2. sealing test:
according to the steps, the overflow pressure of the second digital overflow valve 107 is adjusted to be larger than the nominal pressure of the tested valve 200, the controller 101 controls the first electronic control valve 111 and the second electronic control valve 112 (or 4 and 9) to be opened, the value of the pressure sensor 11 is continuously increased, when the nominal pressure of the tested valve 200 is reached, the controller 101 adjusts and closes the first electronic control valve 111 and the second electronic control valve 113 (or the third electronic control valve 112 and the fourth electronic control valve 114), and after a certain time, the data of the first pressure sensor 103 is observed to judge the pressure loss condition.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An automatic test system for an electromagnetic directional valve, comprising:
the controller is connected with the control end of the tested valve and is used for controlling the tested valve to close or open;
the input end of the flow regulating component is connected with the output end of the medium source, the output end of the flow regulating component is connected with the liquid inlet of the tested valve, and the controlled end of the flow regulating component is connected with the output end of the controller;
the first pressure sensor is arranged at the liquid inlet of the tested valve and used for detecting the pressure value at the liquid inlet of the tested valve and sending the pressure value to the controller;
the liquid inlet end of the first digital overflow valve is connected with the working port of the tested valve, and the controlled end of the first digital overflow valve is connected with the output end of the controller;
the controller controls the overflow pressure value of the first digital overflow valve to be smaller than the preset detection pressure value of the tested valve; the controller controls the working states of the tested valve, the first digital overflow valve and the flow regulating assembly to circulate in a first test stage and a second test stage; in a first test stage, the controller controls the tested valve to be closed, controls the flow regulating assembly to supply liquid to the liquid inlet of the tested valve, and closes the flow regulating assembly when the pressure value of the liquid inlet of the tested valve, detected by the first pressure sensor, is the same as the preset detection pressure value; and the controller controls the tested valve to be opened in a second test stage so as to enable the medium to overflow through the first digital overflow valve.
2. The automatic test system for electromagnetic directional valves according to claim 1, further comprising:
and the second pressure sensor is arranged at the working port of the tested valve and used for detecting the pressure value at the working port of the tested valve and sending the pressure value to the controller.
3. The automatic test system for electromagnetic directional valves according to claim 1, further comprising:
the second digital overflow valve is arranged between the output end of the flow regulating component and the liquid inlet of the tested valve, and the controlled end of the second digital overflow valve is connected with the output end of the controller;
and the controller controls the overflow pressure value of the second digital overflow valve to be larger than the preset detection pressure value.
4. The automatic test system for electromagnetic directional valves according to claim 3, characterized by further comprising:
the liquid inlet end of the third digital overflow valve is communicated with the connecting point of the input end of the flow regulating component and the output end of the medium source; the controlled end of the controller is connected with the output end of the controller;
and the controller controls the overflow pressure value of the third digital overflow valve to be greater than the preset detection pressure value.
5. The automatic test system for electromagnetic directional valves according to claim 4, wherein the first digital overflow valve, the second digital overflow valve and the third digital overflow valve each include:
a valve body;
the valve core is arranged inside the valve body;
the elastic piece is arranged in the valve body, and one end of the elastic piece is connected with the valve core;
the valve rod is arranged in the valve body, and one end of the valve rod is connected with the other end of the elastic piece;
the linear stepping motor is arranged outside the valve body, and the driving output end of the linear stepping motor is connected with the other end of the valve rod; the controlled end of the linear stepping motor is connected with the output end of the controller, and the length of the extending part of the motor driving output end is adjusted under the control of the controller so as to adjust the overflow pressure value.
6. The automatic test system for the electromagnetic directional valve according to any one of claims 1 to 4, wherein the flow regulating assembly comprises a first flow regulating component and a second flow regulating component:
the first flow regulating component comprises a first electric oil cylinder; the liquid inlet of the first electric oil cylinder is connected with the output end of the medium source through a first electric control valve, and the liquid outlet of the first electric oil cylinder is connected with the liquid inlet of the tested valve through a second electric control valve;
the second flow regulating component comprises a second electric oil cylinder; a liquid inlet of the second electric oil cylinder is connected with the output end of the medium source through a third electric control valve, and a liquid outlet of the second electric oil cylinder is connected with a liquid inlet of the tested valve through a fourth electric control valve;
the controlled end of the first electric oil cylinder, the controlled end of the second electric oil cylinder, the controlled end of the first electric control valve, the controlled end of the second electric control valve, the controlled end of the third electric control valve and the controlled end of the fourth electric control valve are all connected with the output end of the controller;
the controller controls the on-off periods of the first electric control valve and the second electric control valve to alternate with the on-off periods of the third electric control valve and the fourth electric control valve; the controller controls the action frequency of the first electric oil cylinder to be the same as that of the second electric oil cylinder.
7. The automatic test system for electromagnetic directional valves according to claim 6, wherein the first electric cylinder and the second electric cylinder each comprise:
a cylinder body;
a piston rod disposed within the cylinder;
the screw rod is arranged in the cylinder body, and one end of the screw rod is connected with the end part of the piston rod;
the stepping motor is positioned outside the cylinder body, and the driving output end of the stepping motor is connected with the other end of the lead screw; the controlled end of the stepping motor is connected with the output end of the controller, and the speed of the motor is adjusted under the control of the controller so as to adjust the medium flow.
8. The automatic test system for electromagnetic directional valves according to claim 7, further comprising:
the third pressure sensor is arranged at the liquid outlet of the first electric oil cylinder, detects the pressure value at the liquid outlet of the first electric oil cylinder and sends the pressure value to the controller;
the fourth pressure sensor is arranged at the liquid outlet of the second electric oil cylinder, detects the pressure value at the liquid outlet of the second electric oil cylinder and sends the pressure value to the controller;
and the controller determines a flow resistance characteristic test result of the tested valve according to the pressure values sent by the third pressure sensor and the fourth pressure sensor.
9. The automatic test system for electromagnetic directional valves according to any of claims 1 to 4, characterized by further comprising:
and the flow sensor is arranged between the flow regulating assembly and the liquid inlet of the tested valve, and detects a flow value entering the liquid inlet of the tested valve and sends the flow value to the controller.
10. A method for testing a tested valve based on the automatic test system for the electromagnetic directional valve as claimed in any one of claims 1 to 9, wherein after the tested valve is determined, a flow regulating assembly is assembled between an output end of a medium source and an inlet of the tested valve; arranging a first pressure sensor at an inlet of the tested valve; a first digital overflow valve is arranged at a working port of the tested valve; and inputting the nominal pressure value, the nominal flow value and the preset detection pressure value of the tested valve into the controller for storage.
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| CN112963408B (en) * | 2021-04-01 | 2022-09-23 | 北京天玛智控科技股份有限公司 | Method for testing pollution sensitivity of reversing valve |
| CN114046283B (en) * | 2021-10-20 | 2023-11-24 | 北京天玛智控科技股份有限公司 | Digital flow valve |
| CN114526276B (en) * | 2022-04-25 | 2022-07-12 | 中海石油(中国)有限公司 | Special hydraulic station for testing functions of hydraulic reversing valve and testing method thereof |
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