CN111735619B - Automatic control electromagnetic directional valve test system and method - Google Patents
Automatic control electromagnetic directional valve test system and method Download PDFInfo
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- CN111735619B CN111735619B CN202010561165.1A CN202010561165A CN111735619B CN 111735619 B CN111735619 B CN 111735619B CN 202010561165 A CN202010561165 A CN 202010561165A CN 111735619 B CN111735619 B CN 111735619B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention provides a test system and a test method for an automatically controlled electromagnetic directional valve, which comprises a controller, wherein a flow regulating component is used for regulating the medium flow input to a liquid inlet of a tested valve under the control of the controller; the controlled end of the first digital overflow valve is connected with the output end of the controller, and the overflow pressure value is adjusted under the control of the controller; the liquid inlet end of the second digital overflow valve is connected with the working port of the tested valve, the controlled end of the second digital overflow valve is connected with the output end of the controller, and the overflow pressure value is adjusted under the control of the controller; the controller controls the state of the tested valve to be closed or opened according to the testing stages at different moments, and controls the medium flow in the flow adjusting assembly and the overflow pressure values of the first digital overflow valve and the second digital overflow valve according to the requirements of different testing stages on the liquid inlet flow, the liquid inlet pressure and the working port pressure of the tested valve. The scheme has low requirements on devices, and the tested valve can be remotely and automatically tested on the premise of ensuring the testing precision.
Description
Technical Field
The invention relates to the technical field of hydraulic control, in particular to a system and a method for testing an automatically-controlled 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 being tested. 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 a system and a method for automatically controlling a test of 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.
To this end, an embodiment of an aspect of the present invention provides an automatic control electromagnetic directional valve testing system, including:
the controller is used for controlling the state of the tested valve to be a closed state or an open state;
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, the controlled end of the flow regulating component is connected with the output end of the controller, and the medium flow input to the liquid inlet of the tested valve is regulated under the control of the controller;
the liquid inlet end of the first digital overflow valve is communicated with the connecting point of the output end of the flow regulating assembly and the liquid inlet of the tested valve, the controlled end of the first digital overflow valve is connected with the output end of the controller, and the overflow pressure value is adjusted under the control of the controller;
the liquid inlet end of the second digital overflow valve is connected with the working port of the tested valve, the controlled end of the second digital overflow valve is connected with the output end of the controller, and the overflow pressure value is adjusted under the control of the controller;
the controller controls the state of the tested valve to be a closed state or an open state according to the testing stages at different moments, and controls the medium flow in the flow regulating assembly and the overflow pressure values of the first digital overflow valve and the second digital overflow valve according to the requirements of the testing stages at different moments on the liquid inlet flow, the liquid inlet pressure and the working port pressure of the tested valve.
Optionally, in the above test system for an automatically controlled electromagnetic directional valve, the flow regulating assembly includes at least two sets of flow regulating components, and each flow regulating component includes:
the liquid inlet of the 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 electric oil cylinder is connected with the liquid inlet of the tested valve through a second electric control valve;
the controlled end of the electric oil cylinder, the controlled end of the first electric control valve and the controlled end of the second electric control valve are all connected with the output end of the controller; the first electric control valve and the second electric control valve are switched on or switched off under the control of the controller; the electric oil cylinder adjusts the action frequency of the electric oil cylinder under the controller of the controller so as to adjust the medium flow.
Optionally, in the above test system for an automatically controlled electromagnetic directional valve, the electric cylinder includes:
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 control electromagnetic directional valve test system further includes:
a liquid inlet end of the third digital overflow valve is communicated with a connection point of the input end of the flow regulating assembly and the output end of the medium source; the controlled end of the overflow pressure adjusting device is connected with the output end of the controller, and the overflow pressure value is adjusted under the control of the controller.
Optionally, in the above automatic control electromagnetic directional valve test system, the first digital overflow valve, the second digital overflow valve, and the third digital overflow valve include:
the valve body is provided with a liquid inlet and a liquid outlet;
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.
The invention also provides a test method for testing a tested valve based on the automatic control electromagnetic directional valve test system, which comprises the following steps:
in the test preparation stage, the controller controls the overflow pressure value of the first digital overflow valve to be the detection pressure value of the tested valve;
in the testing stage, when the tested valve is in a closed state, the controller controls the medium flow of the flow regulating assembly, so that the medium flow of the liquid inlet of the tested valve is regulated to be nominal pressure, the medium pressure of the liquid inlet of the tested valve is regulated to be pressure to be tested, and the pressure to be tested is smaller than or equal to the detection pressure value; meanwhile, controlling the overflow pressure value of the second digital overflow valve to be less than or equal to the pressure to be tested; when the tested valve is in an open state, medium is input into the second digital overflow valve through a working port of the tested valve and overflows through the second digital overflow valve; and then, entering a test step that the tested valve is in a closed state, and testing the reversing performance of the tested valve.
Optionally, in the above testing method, the step of controlling the medium flow rate of the flow rate adjusting assembly by the controller includes:
the controller controls the electric oil cylinders in different groups of flow regulating parts to alternately extend out; when the electric oil cylinder is retracted, the electric oil cylinder stores media; when the electric oil cylinder extends out, the electric oil cylinder conveys the stored medium to the liquid inlet of the tested valve.
Optionally, in the above test method, the step of controlling the medium flow rate of the flow rate adjustment assembly by the controller includes:
the controller controls the rotating speed of a stepping motor in the electric oil cylinder so as to control the extending or retracting speed of the electric oil cylinder and control the medium flow.
Optionally, in the above test method, the controller controls an overflow pressure value of the third overflow valve to be greater than the detection pressure value.
Optionally, in the above test method, the controller controls the lengths of the protruding portions of the driving output ends of the linear stepping motors in the first digital overflow valve, the second digital overflow valve and the third digital overflow valve to adjust the overflow pressure value.
Compared with the prior art, the technical scheme provided by the embodiment of the invention at least has the following beneficial effects:
according to the system and the method for automatically testing the control electromagnetic directional valve, the requirements for the liquid inlet flow, the liquid inlet pressure and the working port pressure of the tested valve at different test stages at different moments are preset in the controller, so that the medium flow in the flow regulating assembly and the overflow pressure values of the first digital overflow valve and the second digital overflow valve can be automatically controlled, and the tested valve can be remotely and automatically tested.
Drawings
Fig. 1 is a block diagram of a test system for an automatically controlled electromagnetic directional valve according to an embodiment of the present invention;
FIG. 2 is a block diagram of a testing system for an automatically controlled 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.
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.
In the following embodiments provided by the present invention, unless contradictory to each other, different technical solutions may be combined with each other, and technical features in different solutions may be replaced with each other.
The embodiment provides an automatic control electromagnetic directional valve testing system, as shown in fig. 1, which includes a controller 100, a flow regulating assembly 200, a first digital overflow valve 12 and a second digital overflow valve 15. The input end of the flow regulating component 200 is connected with the output end of the medium source 1, the output end of the flow regulating component is connected with the liquid inlet of the tested valve 13, the controlled end of the flow regulating component is connected with the output end of the controller 100, and the medium flow input to the liquid inlet of the tested valve 13 is regulated under the control of the controller 100; a first digital overflow valve 12, the liquid inlet end of which is communicated with the connection point of the output end of the flow regulating assembly 200 and the liquid inlet of the tested valve 13, and the controlled end of which is connected with the output end of the controller 100, and the overflow pressure value is adjusted under the control of the controller 100; a second digital overflow 15 valve, the liquid inlet end of which is connected with the working port of the tested valve 13, and the controlled end of which is connected with the output end of the controller 100, and the overflow pressure value is adjusted under the control of the controller 100; the controller 100 controls the state of the tested valve 13 to be a closed state or an open state according to the testing stages at different moments, and controls the medium flow in the flow regulating assembly 200 and the overflow pressure values of the first digital overflow valve 12 and the second digital overflow valve 15 according to the requirements of the testing stages at different moments on the liquid inlet flow, the liquid inlet pressure and the working port pressure of the tested valve 13. In the above scheme, the medium source 1 includes a pump source and a motor for controlling the pump source to work, and the medium may be an emulsion.
In the above scheme, the requirements for the liquid inlet flow, the liquid inlet pressure and the working port pressure of the tested valve 13 at different testing stages at different moments are preset in the controller 100, so that the medium flow in the flow regulating assembly 200 and the overflow pressure values of the first digital overflow valve 12 and the second digital overflow valve 15 can be automatically controlled, and the tested valve can be remotely and automatically tested.
In the above solution, the flow rate adjustment assembly 200 includes at least two sets of flow rate adjustment components, and fig. 2 illustrates two sets of flow rate adjustment components as an example. As shown in fig. 2, one of the flow rate adjusting parts includes: a liquid inlet of the first electric oil cylinder 5 is connected with an output end of the medium source 1 through a first electric control valve 3 in a first flow adjusting part, and a liquid outlet of the first electric oil cylinder 5 is connected with a liquid inlet of the tested valve 13 through a second electric control valve 10 in the first flow adjusting part; another flow regulating member includes: a liquid inlet of the second electric oil cylinder 6 is connected with the output end of the medium source 1 through a first electric control valve 4 in a second flow regulating component, and a liquid outlet of the second electric oil cylinder 6 is connected with a liquid inlet of the tested valve 13 through a second electric control valve 9 in the second flow regulating component; the controlled ends of the first electric cylinder 5 and the second electric cylinder 6, the controlled end of the first electric control valve in the first flow regulating component and the second flow regulating component, and the controlled end of the second electric control valve are all connected with the output end of the controller 100; the first electric control valve and the second electric control valve in each flow regulating component are switched on or switched off under the control of the controller; the electric oil cylinder in each flow regulating component is regulated in action frequency under the controller of the controller so as to regulate the medium flow. That is, the liquid inlet of the first electrically controlled valve 3/4 is used as the liquid inlet of the flow regulating assembly 200, and the liquid outlet of the second electrically controlled valve 9/10 is used as the liquid outlet of the flow regulating assembly 200. Through the arrangement of the structure, when the electric oil cylinder in one of the flow regulating parts is retracted to store liquid, the electric oil cylinders in the other flow regulating parts can extend out to send media into the liquid inlet of the tested valve 13, so that continuous liquid supply of the liquid inlet of the tested valve 13 is realized.
As shown in fig. 3, the electric oil cylinder in the above scheme includes a cylinder body 23; 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 to the output end of the controller 100, and the motor speed is adjusted under the control of the controller 100 to adjust the medium flow. In the scheme, the screw 21 can convert the rotation action of the output end of the stepping motor 20 into the linear action of the piston rod 22, so that the stored liquid in the compression cylinder body 23 is discharged, and 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 13 is controllable. 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 has high automation degree.
In addition, as shown in fig. 2, the testing system in the above solution may further include a third digital overflow valve 2, a liquid inlet end of which is communicated with a connection point between the input end of the flow rate adjusting assembly 200 and the output end of the medium source 1; the controlled end of the overflow pressure regulator is connected with the output end of the controller 100, and the overflow pressure value is adjusted under the control of the controller 100. The overflow pressure of the third digital overflow valve 2 can be selectively adjusted to be greater than the pressure to be tested of the tested valve 13 (for example, the reversing performance of the tested valve under the pressure of 6Mpa or 20Mpa needs to be tested, and the opening pressure of the overflow valve 2 is set to be greater than the test pressure in consideration of the pressure loss of the system), and the digital overflow valve 2 can be set to enable the system to be suitable for various pressure test values, and the safety of the system can be ensured.
In the above configuration, the first digital relief valve 12, the second digital relief valve 15, and the third digital relief valve 2 may have a structure shown in fig. 4, and include: a valve body 32 provided with a liquid inlet and a liquid outlet; 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 32 is connected with the output end of the controller 100, and the length of the extending part of the motor driving output end is adjusted under the control of the controller 100 so as to adjust the overflow pressure value. The remote automatic adjustment of the system pressure is realized through the digital overflow valve, and the automation degree is high. In the structure, the digital overflow valve is compact and simple in structure, convenient to disassemble and assemble and reliable in performance. The control precision is high, and the stepless regulation of pressure can be basically realized due to the very small stepping distance of the linear stepping motor 34, so that the stability is good.
In addition, in order to optimize the testing process and improve the degree of automation control, a pressure sensor can be further arranged at each node to detect the pressure value at each node, and as shown in the structure shown in fig. 2, a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor can be respectively arranged at the liquid outlet of the first electric oil cylinder 5, the liquid outlet of the second electric oil cylinder 6, the liquid inlet of the tested valve and the working port of the tested valve. The pressure sensor sends the detection result of the pressure value to the controller 100 for the controller 100 to call.
Another embodiment of the present invention provides a method for testing a valve to be tested by an automatic control electromagnetic directional valve testing system based on the above scheme, wherein the directional performance testing stage includes the following steps:
in the test preparation phase, the controller 100 controls the relief pressure value of the first digital relief valve 12 to be the detected pressure value of the tested valve 13. Specifically, the pump source in the medium source 1 may be started, the controller 100 adjusts the relief pressure of the third digital overflow valve 2 to be greater than the pressure to be tested of the tested valve 13 (if the reversing performance of the tested valve under the pressure of 6Mpa or 20Mpa needs to be tested, and the opening pressure of the third digital overflow valve 2 is set to be greater than the test pressure in consideration of the system pressure loss), the controller 100 controls the first electronic control valve 4 and the second electronic control valve 9 in one set of flow regulating components (or the first electronic control valve 3 and the second electronic control valve 10 in the other set of flow regulating components) to be opened, and after the medium overflows through the first digital overflow valve 12, the controller 100 controls the linear stepping motor in the first digital overflow valve 12 to adjust the relief pressure to be the detection pressure of the tested valve 13.
In the testing stage, when the tested valve 13 is in a closed state, the controller 100 controls the medium flow of the flow regulating assembly 200, so as to regulate the medium flow of the liquid inlet of the tested valve 13 to a nominal pressure, and regulate the medium pressure of the liquid inlet of the tested valve 13 to a pressure to be tested, wherein the pressure to be tested is less than or equal to the detection pressure value; meanwhile, the overflow pressure value of the second digital overflow valve 15 is controlled to be smaller than or equal to the pressure to be tested; when the tested valve 13 is in an open state, medium is input into the second digital overflow valve 15 through a working port of the tested valve 13 and overflows through the second digital overflow valve 15; and then, entering a test step that the tested valve 13 is in a closed state, and testing the reversing performance of the tested valve 13. Specifically, the method comprises the following steps:
the controller 100 closes the second electric control valve 9, opens the first electric control valve 3 at the same time, fills liquid into the first electric oil cylinder 5 and the second electric oil cylinder 6, presets control pressure in the controller 100, and automatically closes the first electric control valve 3/4 through the controller when the data of the first pressure sensor and the second pressure sensor are larger than the set control pressure; at the moment, according to the nominal flow of the tested valve 13 and the cylinder diameters of the first electric oil cylinder 5 and the second electric oil cylinder 6, a certain rotating speed is set for the stepping motor 20 of the first electric oil cylinder 5, meanwhile, the second electric control valve 9 is opened, the rotating speed of the stepping motor 20 is converted into linear motion of the piston rod 22 through the lead screw 21, oil in the first electric oil cylinder 23 is compressed to overflow through the first digital overflow valve 12, and the inlet pressure of the tested valve 13 is kept at the pressure to be tested; and then, the tested valve 13 is controlled to be opened by the controller 100, the oil overflows through the second digital overflow valve 15, the tested valve 13 is controlled to be closed at a certain time interval by the controller 100, the oil overflows through the first digital overflow valve 12, and the operation is repeated in such a circulating way to test the reversing performance of the tested valve 13.
Referring to the structure shown in fig. 2, the controller 100 controls the electric cylinders in different sets of flow regulating members to alternately extend; when the electric oil cylinder is retracted, the electric oil cylinder stores media; when the electric oil cylinder extends out, the electric oil cylinder conveys the stored medium to the liquid inlet of the tested valve. Specifically, when the liquid stored in the first electric cylinder 5 is about to be drained (because the speed of the stepping motor is constant, the speed of the piston rod is constant, and can be judged by time according to the length of the cylinder), a command is sent to the linear stepping motor of the second electric cylinder 6 to enable the linear stepping motor to rotate according to the speed of the stepping motor in the first electric cylinder 5, meanwhile, the second electric control valve 9 in the second group of flow regulating components is opened, the second electric control valve 10 in the first flow regulating component is closed, a recovery command is sent to the stepping motor of the first electric cylinder 5, the first electric control valve 3 in the first flow regulating component is opened, the first electric cylinder 5 is filled, when the first pressure sensor reaches a set control pressure value, the first electric control valve 3 in the first flow regulating component is closed, the stepping motor of the first electric cylinder 5 is stopped, the filling is completed, and when the liquid stored in the second electric cylinder 6 is about to be drained, the second electric cylinder 6 is filled according to the same method, and the first electric cylinder 5 is opened to supply liquid, so that the tested valve 13 is ensured to have continuous nominal flow of fluid passing through. Above scheme, can adjust the outlet pressure of being tried valve 13 through second digital overflow valve 15 to can remote regulation, can realize being tried valve performance detection under the different backpressure operating modes. The flow resistance characteristics of the valve to be tested 13 at different pressures can be detected from the detection results of the third pressure sensor and the fourth pressure sensor.
When the sealing performance of the valve 13 to be tested is tested, the method comprises the following steps:
according to the steps, the overflow pressure of the third digital overflow valve 12 is adjusted to be larger than the nominal pressure of the tested valve 13, the controller 100 controls the first electric control valve 3 and the second electric control valve 10 in one group of flow regulating components (or the first electric control valve 4 and the second electric control valve 9 in the other group of flow regulating components) to be opened, the value of the third pressure sensor is continuously increased, when the nominal pressure of the tested valve 13 is reached, the controller closes the first electric control valve 3 and the second electric control valve 10 in one group of flow regulating components (or the first electric control valve 4 and the second electric control valve 9 in the other group of flow regulating components), the data of the third pressure sensor is observed after a plurality of times, the pressure loss condition is judged, and the sealing performance of the tested valve can be determined according to the pressure loss condition.
In the above solution, the controller 100 controls the lengths of the protruding portions of the driving output ends of the linear stepping motors in the first digital overflow valve 12, the second digital overflow valve 15, and the third digital overflow valve 2 to adjust the overflow pressure value. The scheme in the embodiment of the invention overcomes the defects in the prior art, improves the flow, pressure control precision and automation degree, improves the detection means of the electromagnetic directional valve, improves the detection means and ensures the product quality.
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 (9)
1. An automatic control solenoid directional valve test system, characterized by, includes:
a controller;
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, the controlled end of the flow regulating component is connected with the output end of the controller, and the medium flow input to the liquid inlet of the tested valve is regulated under the control of the controller;
the liquid inlet end of the first digital overflow valve is communicated with the connecting point of the output end of the flow regulating assembly and the liquid inlet of the tested valve, the controlled end of the first digital overflow valve is connected with the output end of the controller, and the overflow pressure value is adjusted under the control of the controller;
the liquid inlet end of the second digital overflow valve is connected with the working port of the tested valve, the controlled end of the second digital overflow valve is connected with the output end of the controller, and the overflow pressure value is adjusted under the control of the controller;
the controller controls the state of the tested valve to be a closed state or an open state according to the test stages at different moments, and controls the medium flow in the flow regulating assembly and the overflow pressure values of the first digital overflow valve and the second digital overflow valve according to the requirements of the test stages at different moments on the liquid inlet flow, the liquid inlet pressure and the working port pressure of the tested valve;
the flow regulating assembly includes at least two sets of flow regulating components, each flow regulating component including:
the liquid inlet of the 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 electric oil cylinder is connected with the liquid inlet of the tested valve through a second electric control valve;
the controlled end of the electric oil cylinder, the controlled end of the first electric control valve and the controlled end of the second electric control valve are all connected with the output end of the controller; the first electric control valve and the second electric control valve are switched on or switched off under the control of the controller; and the electric oil cylinder adjusts the action frequency of the electric oil cylinder under the controller of the controller so as to adjust the medium flow.
2. The automatically controlled solenoid operated valve testing system of claim 1, wherein said electric cylinder comprises:
a cylinder body;
a piston rod disposed in 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.
3. The automatically controlled solenoid operated valve testing system of claim 2, further comprising:
a liquid inlet end of the third digital overflow valve is communicated with a connection point of the input end of the flow regulating assembly and the output end of the medium source; the controlled end of the overflow pressure adjusting device is connected with the output end of the controller, and the overflow pressure value is adjusted under the control of the controller.
4. The automatically controlled solenoid operated valve testing system of claim 3, wherein said first digital excess flow valve, said second digital excess flow valve and said third digital excess flow valve comprise:
the valve body is provided with a liquid inlet and a liquid outlet;
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.
5. A test method for testing a tested valve based on the automatic control electromagnetic directional valve test system of claim 3 or 4, characterized by comprising the following steps:
in the test preparation stage, the controller controls the overflow pressure value of the first digital overflow valve to be the detection pressure value of the tested valve;
in the testing stage, when the tested valve is in a closed state, the controller controls the medium flow of the flow regulating assembly, so that the medium flow of the liquid inlet of the tested valve is regulated to be nominal pressure, the medium pressure of the liquid inlet of the tested valve is regulated to be pressure to be tested, and the pressure to be tested is smaller than or equal to the detection pressure value; meanwhile, controlling the overflow pressure value of the second digital overflow valve to be less than or equal to the pressure to be tested; when the tested valve is in an open state, medium is input into the second digital overflow valve through a working port of the tested valve and overflows through the second digital overflow valve; and then, entering a test step that the tested valve is in a closed state, and testing the reversing performance of the tested valve.
6. The method of claim 5, wherein the step of the controller controlling the media flow of the flow conditioning assembly comprises:
the controller controls the electric oil cylinders in different groups of flow regulating parts to alternately extend out; when the electric oil cylinder is retracted, the electric oil cylinder stores media; when the electric oil cylinder extends out, the electric oil cylinder conveys the stored medium to the liquid inlet of the tested valve.
7. The method of claim 6, wherein the step of the controller controlling the media flow of the flow conditioning assembly comprises:
the controller controls the rotating speed of a stepping motor in the electric oil cylinder so as to control the extending or retracting speed of the electric oil cylinder and control the medium flow.
8. The test method of claim 7, wherein:
and the controller controls the overflow pressure value of the third digital overflow valve to be larger than the detection pressure value.
9. The test method of claim 8, wherein:
and the controller controls the length of the extending part of the driving output end of the linear stepping motor in the first digital overflow valve, the second digital overflow valve and the third digital overflow valve so as to adjust the overflow pressure value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010561165.1A CN111735619B (en) | 2020-06-18 | 2020-06-18 | Automatic control electromagnetic directional valve test system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010561165.1A CN111735619B (en) | 2020-06-18 | 2020-06-18 | Automatic control electromagnetic directional valve test system and method |
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| Publication Number | Publication Date |
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| CN111735619A CN111735619A (en) | 2020-10-02 |
| CN111735619B true CN111735619B (en) | 2022-08-26 |
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