CN114046289A - Valve core hydraulic power testing method and system - Google Patents
Valve core hydraulic power testing method and system Download PDFInfo
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- CN114046289A CN114046289A CN202110880802.6A CN202110880802A CN114046289A CN 114046289 A CN114046289 A CN 114046289A CN 202110880802 A CN202110880802 A CN 202110880802A CN 114046289 A CN114046289 A CN 114046289A
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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Abstract
The invention relates to a method and a system for testing hydrodynamic force of a valve element, and belongs to the technical field of valve parameter testing. The test method comprises the following steps: (1) pressure detection sensors are distributed at two ends of the valve core and used for measuring axial acting forces borne by two end faces of the valve core; (2) supplying hydraulic oil to valve oil port on valve body, applying resultant force to valve core via pressure detecting sensors at two ends, and reading the detected data on two pressure sensors to obtain F11And F21(ii) a Applying a leftward closing force to the valve core, and reading the detection data on the pressure sensors at two sides to obtain F11And F21(ii) a (3) According to the formula F ═ F11+F12‑F21‑F22]2 calculate the core hydrodynamic force. Compared with the prior art, the influence of the axial friction force on the hydraulic testing accuracy can be reduced,the method can be widely applied to the technical field of electromagnetic valve testing.
Description
Technical Field
The invention relates to the technical field of testing of servo proportional valves, in particular to a valve core hydrodynamic force testing method and system.
Background
As a new hydraulic control device, a proportional valve is specifically designed to replace an original control part with a proportional solenoid in addition to a normal pressure valve, a flow valve and a directional valve to achieve more precise control, and for example, a proportional valve disclosed in patent document CN1928370A, etc. is designed to continuously and proportionally control the pressure, flow rate or direction of oil flow in accordance with an input electric signal and to be remotely controlled. For a proportional valve, it usually has pressure compensation capability, so that the output pressure and flow can be independent of load changes; thus, the method has good performances in the aspects of precision, dynamic response, stability and the like. In addition, the servo proportional valve adopts the proportional electromagnet which is the same as a typical proportional valve in structure as an electro-mechanical converter, but adopts large current control and adopts a valve core and valve sleeve type structure of the servo valve, so that zero covering of a valve port, zero dead zone and dynamic response performance approaching to those of the servo valve can be realized, and the servo valve can be widely applied to various closed loop systems.
In the design process of the servo proportional valve, in order to improve the flow range and the pressure precision of the servo proportional valve, the servo proportional valve needs to be optimally designed, and the mechanical property in the working process is taken as an important reference in the optimal design process; among the mechanical parameters of the valve cores, the hydrodynamic force is a key factor influencing the hydraulic valve and is usually directly ignored or calculated by a theoretical company, so that a larger error is easily caused in the control of the valve core of the servo proportional valve; in addition, sampling measurement of parameters such as hydrodynamic force is also required for mass-produced servo proportional valves.
In order to solve the above technical problems, a system and a method for testing the hydraulic force of a servo proportional valve are disclosed in patent document No. CN110826159A, wherein the adopted testing system comprises a pull pressure sensor and a pressure sensor, and the specific testing method is to measure the pressure at four valve port positions of the valve P, T, A, B by four pressure sensors, and to fixedly connect the pull pressure sensor and the valve core, so as to measure the hydraulic force under the opening degree of the valve port with the hole. In addition, patent document No. CN105971975A discloses a valve body hydraulic power test system and a test method for a large flow load control valve; the system and the method are basically the same as those of the patent document with publication number CN110826159A, that is, the test system includes a pull pressure sensor and a pressure sensor, and in the test process, the valve core is processed to form a connection hole structure for connecting the pull pressure sensor, so as to perform the test.
In the prior art such as the above technical scheme, because friction exists between the valve core and the valve sleeve, a test result has a large error, so that the hydraulic force is difficult to be measured more accurately; in addition, in the prior art, the valve core needs to be subjected to destructive processing of hole forming in the test process so as to realize fixed connection between the sensor and the valve core, so that the valve core can only be used for testing the hydraulic force of the valve in the design process and is difficult to be used for batch test in the production and manufacturing process.
Disclosure of Invention
The invention mainly aims to provide an improved valve core hydrodynamic force testing method so as to improve the testing accuracy of the valve core hydrodynamic force;
another objective of the present invention is to provide a valve core hydrodynamic test method based on a test system with improved structure, which can not only effectively improve the test accuracy of the valve core hydrodynamic force, but also does not need to perform destructive processing on the valve core and the valve end cover plate, so as to be used for testing not only in the product design process, but also in the product manufacturing and production process;
it is yet another object of the present invention to provide a valve cartridge hydraulic force testing system that can be used to perform the above-described testing method.
In order to achieve the other aim, the valve core hydraulic power testing method provided by the invention is used for testing by using a testing system with an improved structure; the test system comprises a hydraulic oil supply system, a rack and a hydraulic power test device arranged on the rack; the hydraulic power testing device comprises a fixed support, and a pressure sensor and a displacement adjusting unit which are arranged on the fixed support; the test system comprises a valve end cover plate group; the hydrodynamic force testing device comprises a transition valve block group; the transition valve block group comprises a plurality of transition valve blocks, each transition valve block comprises a valve block base body and a plurality of oil-way channels arranged in the valve block base body, and a valve matching mounting surface and a rack matching fixed connection surface are arranged on the valve block base body; one pipe port of the oil passage is distributed on the valve matching mounting surface to form a first butt oil port, and the other pipe port is distributed on the rack matching fixed connection surface to form a second butt oil port; the valve end cover plate group comprises a plurality of sets of valve end cover plate pairs, each set of valve end cover plate pair comprises a left side end cover plate and a right side end cover plate, and each end cover plate is provided with a push rod through hole; the test method comprises the following steps:
a matching modification step, namely selecting a matching valve end cover plate pair matched with a valve body base body of the valve to be tested from the valve end cover plate group and the transition valve block group and matching the transition valve block; disassembling the lower side end cover plate from the valve body base body, and fixedly installing the matched valve end cover plate pair on the left side end part and the right side end part of the valve body base body so as to temporarily modify the valve to be tested into a valve for testing;
a matching installation step, namely fixedly installing a matching transition valve block on a fixed support, and enabling a second butt joint oil port to be in watertight butt joint with a hydraulic pipe orifice distributed on the valve fixed support; fixedly mounting the valve for testing on a valve matching fixed connection surface of the matching transition valve block, and enabling the first butt joint oil port to be in water-tight butt joint with a valve oil port distributed on the valve for testing; on the fixed support, a pressure sensor is respectively arranged at the left end side and the right end side of the valve for testing, and a valve core push rod is arranged between each pressure sensor and the end face of the valve core at the same side in a pressure equalizing manner; the valve core push rod can movably and watertight penetrate through the push rod through hole; one of the two pressure sensors is fixedly mounted on a mover of the displacement adjustment unit, and the other is movably mounted on a fixed support through a guide rail slider mechanism; an elastic mechanism is arranged between the other one of the two fixed supports and the elastic restoring force of the elastic mechanism is used for forcing the valve core push rod and the end face of the valve core to be tightly pressed and detachably connected in a butting way;
a pressure supply testing step, namely supplying hydraulic oil to a hydraulic pipe orifice by using a hydraulic oil supply system through a hydraulic oil pipe; then the displacement adjusting unit is controlled to indirectly drive the valve core to move rightwards relative to the valve sleeve by preset displacement, and the detected data read from the two pressure sensors are respectively F11And F21(ii) a And controlling the displacement adjusting unit to indirectly drive the valve core to move leftwards relative to the valve sleeve by preset displacement, and reading the detection data on the two pressure sensors to be F respectively12And F22；
A numerical calculation step according to the formula F ═ F11+F12-F21-F22]2 calculating the valve core hydraulic power of the valve to be measured.
In the technical scheme, the configuration is different from that of a single-side pulling pressure sensor in the prior art, the pressure sensors are arranged on two sides and are in a pressing mode, and the mode that the sensors on one side move and the sensors on the other side elastically press by adopting an elastic mechanism is matched, so that the thrust resultant force of the two sensors can be ensured to form an axial external force for driving the valve core to move; the axial displacement resultant force is measured on the premise of not damaging the valve core; the problem of friction force offset is solved based on bidirectional movement, so that the accuracy of the valve core hydraulic force test can be effectively improved; by matching with the valve end cover plate provided with the push rod through hole, the test of hydrodynamic force in the design process can be realized, and the non-destructive test can be carried out on batch products. In addition, through setting up the transition valve piece, set up the valve hydraulic fluid port quantity upper limit on same valve body that quantity more than or equal to has now on fixing support to can supply system and same fixing support based on same hydraulic oil, provide the hydrodynamic test for the valve of a plurality of models, thereby effectively improve this test system's compatibility, and can improve the speed of test in batches.
The specific scheme is that the elastic mechanism is a pressure spring, one end of the pressure spring is pressed against the other end of the pressure spring, and the other end of the pressure spring is pressed against the fixed support. The technical scheme is simple and convenient to process and assemble.
The specific scheme is that a pressure detection interface laying surface is arranged on a valve block base body, and an oil pressure detection interface communicated with a first pair of oil receiving ports is arranged on the pressure detection interface laying surface; the hydraulic oil supply system comprises a pressure detector for acquiring oil pressure at an oil pressure detection interface. The interface through with oil pressure equipment is laid on the transition valve piece to can set up manometer and the separation of hydraulic oil feed system, thereby be convenient for test the valve of different models, and be convenient for change.
The preferred scheme is that the displacement adjusting unit comprises a displacement conversion module and an adjusting driving motor; the displacement conversion module comprises a mounting seat and a screw nut mechanism which is detachably mounted on the mounting seat; in the screw rod nut mechanism, two end parts of a screw rod are rotatably supported on a mounting seat, and a screw rod nut is arranged on the mounting seat and is supported and limited by a guide rail sliding block mechanism; the adjusting driving motor is used for driving the screw rod to rotate; one is fixedly arranged on the screw rod nut; and the mounting seat is provided with a laser displacement sensor for monitoring the position of a reflector fixedly arranged on the valve core push rod.
In order to achieve the main purpose, the valve core hydrodynamic force testing method provided by the invention comprises the following steps:
(1) a left end side force detection sensor and a right end side force detection sensor which are connected with the end face of the valve core are arranged at the two ends of the valve core and are used for measuring the axial acting force applied to the two end faces of the valve core in the process that the valve core moves relative to the valve sleeve along the axial direction;
(2) supplying hydraulic oil to the valve port on the valve body, applying a resultant force axially and rightwards to the valve core through the left end side force detection sensor and the right end side force detection sensor to drive the valve core to move rightwards relative to the valve sleeve by a preset distance, and reading the left end side force detection sensor and the right end side force detection sensorThe detection data on the right-end side force detection sensor corresponds to F11And F21(ii) a Applying a resultant force axially and leftwards to the valve core through the left end side force detection sensor and the right end side force detection sensor to drive the valve core to move leftwards relative to the valve sleeve by a preset distance, and reading the detection data on the left end side force detection sensor and the right end side force detection sensor to be F correspondingly11And F21；
(3) According to the formula F ═ F11+F12-F21-F22]2 calculate the core hydrodynamic force.
In the technical scheme, the force detection sensors are arranged on two sides, the force sensors can be force sensors only capable of testing unidirectional force or force sensors capable of measuring bidirectional force, and friction force content can be offset by matching with bidirectional displacement measurement, so that the testing accuracy is effectively improved.
In order to achieve the other purpose, the invention provides a specific scheme that the left end side force detection sensor and the right end side force detection sensor are both pressure sensors and are used for detecting the pushing force exerted on the end surface of the valve core in the process of pushing the valve core to move relative to the valve sleeve.
In the technical scheme, on the basis of the bidirectional arrangement of the force sensors, the force sensors are connected with the end parts of the valve cores in a pressing contact mode, so that the valve cores do not need to be subjected to destructive treatment in the testing process.
In order to achieve the other object, the present invention provides a preferable solution that a valve element push rod is compressed between the left end side force detection sensor and the left end surface of the valve element, and a valve element push rod is compressed between the right end side force detection sensor and the right end surface of the valve element, and the two valve element push rods and the end surfaces of the valve element are in compressed and separable abutting contact.
In the technical scheme, on the basis of the bidirectional arrangement of the force sensors, the force sensors are connected with the end parts of the valve cores in a pressing contact mode, so that the valve cores do not need to be subjected to destructive treatment in the testing process; in addition, indirect contact is carried out through the valve core push rod, so that the valve core hydraulic power testing device is convenient to match with valve core hydraulic power tests of different models.
In order to achieve the above further object, the present invention provides a testing system for hydraulic power of a valve core, which comprises a hydraulic oil supply system, a rack and a hydraulic power testing device installed on the rack; the hydraulic power testing device comprises a fixed support, and a pressure sensor and a displacement adjusting unit which are arranged on the fixed support; the test system comprises a valve end cover plate group; the hydrodynamic force testing device comprises a transition valve block group; the transition valve block group comprises a plurality of transition valve blocks and is used for fixedly mounting the valve to be tested on the fixed support; the transition valve block comprises a valve block base body and a plurality of oil path channels arranged in the valve block base body, and a valve matching mounting surface and a rack matching fixed connection surface are arranged on the valve block base body; one pipe port of the oil passage is arranged on the valve matching installation surface to form a first butt joint oil port for detachably butting with a valve oil port arranged on the valve to be tested; the other pipe port of the oil passage is arranged on the matching and fixing surface of the rack to form a second butt joint oil port which is detachably butted with a hydraulic pipe orifice arranged on the fixed support; the valve end cover plate group comprises a plurality of sets of valve end cover plate pairs, and each set of valve end cover plate pair comprises a left side end cover plate and a right side end cover plate and is used for being mounted on the left side and the right side of the valve to be tested so as to replace the side valve end cover plates on the valve to be tested; centering the valve end cover plates, wherein each end cover plate is provided with a push rod through hole; on the fixed support, a pressure sensor and a valve core push rod for pressing between each pressure sensor and the end face of the valve core on the same side are respectively arranged at the left end side and the right end side of the transition valve block; the valve core push rod can movably and watertight penetrate through the push rod through hole; one of the two pressure sensors is fixedly mounted on a mover of the displacement adjustment unit, and the other is movably mounted on a fixed support through a guide rail slider mechanism; an elastic mechanism is arranged between the other one of the two fixed supports and the elastic restoring force of the elastic mechanism is used for forcing the valve core push rod to be tightly pressed and detachably connected with the end face of the valve core in a butting way; the hydraulic oil supply system is used for supplying hydraulic oil to the hydraulic nozzle through the hydraulic oil pipe.
The specific scheme is that the elastic mechanism is a pressure spring, one end of the pressure spring is pressed against the other end of the pressure spring, and the other end of the pressure spring is pressed against the fixed support.
The specific scheme is that a pressure detection interface laying surface is arranged on a valve block base body, and an oil pressure detection interface communicated with a first pair of oil receiving ports is arranged on the pressure detection interface laying surface; the hydraulic oil supply system comprises a pressure detector for acquiring oil pressure at an oil pressure detection interface.
The preferred scheme is that the displacement adjusting unit comprises a displacement conversion module and an adjusting driving motor; the displacement conversion module comprises a mounting seat and a screw nut mechanism which is detachably mounted on the mounting seat; in the screw rod nut mechanism, two end parts of a screw rod are rotatably supported on a mounting seat, and a screw rod nut is arranged on the mounting seat and is supported and limited by a guide rail sliding block mechanism; the adjusting driving motor is used for driving the screw rod to rotate; one is fixedly arranged on the screw rod nut; and the mounting seat is provided with a laser displacement sensor for monitoring the position of a reflector fixedly arranged on the valve core push rod.
The preferable scheme is that a panel for constructing the protective cover is fixedly arranged on the rack, and a display screen for displaying the valve core hydrodynamic force measurement data and the measurement result and an oil pressure gauge for displaying the oil pressure at the valve oil port of the valve to be measured are arranged on the front panel.
Drawings
FIG. 1 is an exploded view of a valve under test according to an embodiment of the present invention;
FIG. 2 is an exploded view of a test valve according to an embodiment of the present invention;
FIG. 3 is a perspective view of a test system in an embodiment of the present invention;
FIG. 4 is a perspective view of a test system in an embodiment of the present invention with the shield and display screen omitted;
FIG. 5 is a partial block diagram of a test system according to an embodiment of the present invention;
FIG. 6 is an enlarged view of a portion A of FIG. 4;
FIG. 7 is a perspective view of a testing device in an embodiment of the present invention;
FIG. 8 is a vertical cross-sectional structural view of a test apparatus in an embodiment of the present invention;
FIG. 9 is an exploded view of the testing device of the embodiment of the present invention after omitting the displacement adjusting unit and the pushing pressure sensor;
FIG. 10 is a view of the structure of FIG. 9 from another perspective;
FIG. 11 is a block diagram illustrating the construction of a transition valve block and a test connection mounted thereon according to an embodiment of the present invention;
FIG. 12 is a view of the structure of FIG. 11 from another perspective;
FIG. 13 is a schematic view of the connection structure of the force sensor, the valve core and the valve sleeve during the testing process;
FIG. 14 is a schematic view of a reasonable structure for comparing the valve core applied to the right during the test;
FIG. 15 is a schematic view of a reasonable structure for comparing the left direction of the valve core during the test;
FIG. 16 is a flowchart illustrating a testing method according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples and figures.
The invention mainly conceives that on the basis of the prior art, a test system and a test method for the valve core hydraulic power are improved so as to reduce the influence of friction force on a hydraulic power test result in the test process and/or ensure that the improved test system can be suitable for nondestructive test in the production process of products; the structure of the equipment such as the gantry and the hydraulic oil supply system can be designed with reference to existing products, and is not limited to the examples in the following embodiments.
Examples
Fig. 1 shows a valve 01 to be tested according to an embodiment of the present invention, and fig. 2 shows a valve 09 for testing according to an embodiment of the present invention, both of which are three-position four-way valves in structure, and a valve 02 for testing is obtained by modifying the valve 01 to be tested; in this embodiment, both are three-position, four-way servo proportional valves. Specifically, the valve 01 to be tested comprises a valve body 02, a valve sleeve 03 arranged in the valve body 02, and a valve core 04 movably sleeved in the valve sleeve 03; the valve body 02 includes a valve body base 020 and a left valve end cover 021 detachably fixed to the left and right ends of the valve body base 020, and the other end of the valve body base is matched with an electromagnet to drive the valve core to move. As described above, the valve 09 for testing is obtained by modifying the valve 01 to be tested, specifically, the left valve end cover plate 021 is replaced by the left valve end cover plate 91 provided with the push rod through hole 910, and the right valve end cover plate 92 provided with the push rod through hole 920 is installed on the right side, so that the test of parameters such as the valve core hydrodynamic force can be completed on the premise of not destructively modifying the structure of the valve 01 to be tested, and thus, not only can the parameter test be performed on the design object in the design process, but also the parameter test can be performed on the product object in the batch production process; the push rod through hole 910 and the push rod through hole 920 are correspondingly used for exposing the left and right valve core end faces of the valve core 04, that is, in the test valve 09, the valve body 08 thereof is formed by fixedly connecting a valve body base 020, a left valve end cover plate 91 and a right valve end cover plate 92, and the structures and reference numbers of other parts are the same as those of the test valve 01, and are not described herein again. For the valve 01 to be tested and the valve 09 for testing, a valve oil port 023, a valve oil port 024, a valve oil port 025 and a valve oil port 026 are respectively arranged on the valve body base 020 of the valve 01 and the valve 09, correspondingly, the valve oil port 023 is a main oil inlet P, the valve oil port 023 is a working oil inlet A, the valve oil port 023 is a working oil return port B, and the valve oil port 023 is a main oil return port T.
In this embodiment, the valve core hydrodynamic force of the valve 01 to be tested is tested by testing the valve core hydrodynamic force of the test valve 09, and the specific test process includes the following steps:
step (1), as shown in fig. 13, a left end side force detection sensor 81 and a right end side force detection sensor 82 connected to the end surfaces of the valve core are correspondingly disposed on both end sides of the valve core 04, and are used for measuring the axial acting force applied to both end surfaces of the valve core 04 during the axial movement of the valve core 04 relative to the valve sleeve 03.
In this step, the left-end side force detection sensor 81 and the right-end side force detection sensor 82 may be constructed using a force detection sensor for measuring only the pulling force, a pressure sensor for measuring only the pushing force, or a force detection sensor for measuring both the pulling force and the pushing force; if a force detection sensor only used for measuring the tensile force is adopted for construction, the valve core 04 needs to be damaged and machined, usually, a connecting threaded hole is machined for detachable fixed connection, and the method is usually suitable for parameter testing of a design object in the design process and is not suitable for parameter testing of a product object in the production process; when the force detection sensor capable of carrying out the pushing pressure test is adopted, the connection after destructive processing can be carried out, and the connection only in abutting contact can also be adopted; in order to avoid destructive modification of the test object, it is preferable to detect the pressing force by using a sensor capable of measuring the pressing force, and the resultant force of the pressing forces of the both against the end face of the valve element is the resultant force exerted by the valve element in the axial direction.
For the configuration of the valve end cover plate, for the test with low requirements, the valve end cover plate can be taken down in the test process for direct test, and the test result cannot be influenced because the test oil pressure is usually low and the oil leakage amount is little; for the testing process that needs to use the valve end cover plate, which is usually the test for testing the special working condition with larger pressure, a push rod through hole for the valve core push rod to pass through, such as the push rod through hole 910 and the push rod through hole 920 shown in fig. 2, needs to be processed on the valve end cover plate.
Step (2), as shown in fig. 14 and 2, a predetermined pressure of hydraulic oil is supplied to the valve port 023, the valve port 024, the valve port 025 and the valve port 026 of the valve body 02, the pressure is supplied from the hydraulic oil supply system, and a resultant force F is applied to the valve body 04 by the left end side force detection sensor 81 and the right end side force detection sensor 821The resultant force in the axial direction of the valve core and towards the right drives the valve core 04 to move towards the right for a preset distance relative to the valve sleeve 03, and then the corresponding detection data on the left end side force detection sensor 81 and the right end side force detection sensor 82 is read as F11And F21In FIG. 14, the pressing force is taken as an example of the joining force F1、F11And F21Indicated by arrows.
Step (3), as shown in fig. 15 and fig. 2, a resultant force is applied to the valve element 04 along the axial direction of the valve element and towards the left by the left side force detection sensor 81 and the right side force detection sensor 82, so as to drive the valve element 04 to move towards the left by a preset distance relative to the valve housing 03, and the left side force detection sensor 81 and the right side force detection sensor 82 are readThe detection data on the detection sensor 82 corresponds to F12And F22In FIG. 15, the pressing force is taken as an example of the joining force F2、F12And F22Indicated by arrows.
Step (4), according to the formula F ═ F11+F12-F21-F22]2 calculate the core hydrodynamic force.
In this step, assuming a state where the opening degree of the PA port is changed, F is shown in fig. 1411The rightward horizontal force, F, applied to the end face of the spool by the left-end side force sensor 8121The left horizontal force and the right resultant force F applied to the end face of the valve core by the right end side force measuring sensor 821The valve core 04 is driven to move rightwards relative to the valve sleeve 03, so that the valve core 04 is subjected to the friction force F of the valve sleeve 03 to the valve core 04 towards the leftfFurthermore, the valve core 04 is subjected to a resultant force F of hydraulic force acting leftwardLiquid for treating urinary tract infectionWhen the spool moves rightward, the axial direction of the spool is balanced, and the direction toward the right is a positive direction, the following equation (1) is given:
F11＝F21+Ff+Fliquid for treating urinary tract infection
Further, as shown in FIG. 15, F12The rightward horizontal force, F, applied to the end face of the spool by the left-end side force sensor 8122The left horizontal force and the left resultant force F applied to the end face of the valve core by the right side force measuring sensor 822The valve core 04 is driven to move leftwards relative to the valve sleeve 03, so that the valve core 04 is subjected to right friction force F of the valve sleeve 03fFurthermore, a resultant force F of hydraulic force toward the right is applied to the valve element 04Liquid for treating urinary tract infectionWhen the valve core moves leftwards, the axial direction of the valve core has a receiving balance, and if the valve core is taken to be a positive direction, the following formula 2 is provided:
F12＝F22-Ff+Fliquid for treating urinary tract infection
Assuming that the opening of the PA port is from 0-10mm-0, two curves corresponding to the displacement are added to obtain:
F11+F12＝F21+F22+2*Fliquid for treating urinary tract infection
Namely, the method comprises the following steps: f ═ F11+F12-F21-F22]And 2, the resultant hydraulic force at the corresponding position can be obtained.
In addition, the dynamic friction force can be solved based on the above manner, that is, the above equation 1 and equation 2 can be subtracted, so that the dynamic friction force at the corresponding position can be obtained as:
Ff＝[F11-F12-(F21-F22)]/2
among the above methods are: (1) measuring the steady-state hydrodynamic force, calibrating the friction force in advance, and neglecting the influence of the radial clamping force on the change of the friction force; (2) measuring the resultant force of the hydrodynamic force, and neutralizing the frictional force by reciprocating twice in a motion state to obtain a composite hydrodynamic force; (3) the transient friction force is in direct proportion to the motion speed of the valve core, in the actual test process, the motion speed of the valve core 04 is 60 mu m/s, and the transient hydrodynamic force can be almost ignored.
In the above steps (2) and (3), when the tension sensor is used, the linear displacement driving mechanism on one side may be used to drive by matching the outward displacement with the elastic mechanism on the other side providing elastic outward tension, or the linear displacement driving mechanisms on both sides may be used to drive; if the pressure sensor is adopted, the linear displacement driving mechanism on one side can be adopted to drive in a pushing and moving way and matched with the elastic mechanism on the other side to provide inward pushing and moving pressure, and the linear displacement driving mechanism on the two sides can also be adopted to drive; in order to simplify the control method and reduce the equipment cost, it is preferable to configure an elastic mechanism on the other side to apply a pulling force or a pushing force to the end of the valve core, so as to avoid the problem of damage caused by hard connection when the displacements of the linear displacement output devices on the two sides are unequal, and when the test displacement is large, the fixed end of the elastic mechanism on the other side can be fixed on a rotor of one linear displacement output device; namely, the test system can adopt various structural forms to carry out the test.
As for the specific structure of the test system, in this embodiment, the test system 1 shown in fig. 3 to 12 is specifically used for testing, and the test system is configured with valve end cover pairs, specifically configured with a valve end cover plate group including a plurality of sets of valve end cover pairs, so that a plurality of valves to be tested with different structural sizes can be tested by using the same test system; in order to facilitate the fixed installation of the valve body 020 of the test valve 09, the test system is further provided with a transition valve block, specifically a transition valve block group comprising a plurality of transition valve blocks.
Referring to fig. 3 to 12, the testing system 1 of the present invention includes a hydraulic oil supply system 2, a valve end cover plate set, a rack 10, and a hydraulic testing device 3 mounted on the rack 10. The bench 10 is formed by processing and assembling aluminum profiles, and the side panels 11, the upper front panel 12, the table top panel 13, the lower front panel 14, the top panel 17 and other panels for constructing the protective cover are arranged on the bench 10, so that only the hydraulic testing device 3 and other display equipment are exposed in the working process, most structures such as pipelines on the hydraulic oil supply system 2 can be arranged in the protective cover, and the use safety of the equipment is improved. The upper front panel 12 is provided with a display screen 15 and a plurality of hydraulic gauges 16, the display screen 15 is used for displaying valve core hydraulic power measurement data and measurement calculation results, so that an operator can conveniently judge in the test process, the judgment results can be further displayed on the display screen, the test results are uploaded to a designated terminal or a server through an external data line, and the hydraulic gauges 16 are used for displaying an oil pressure gauge of the oil pressure at the valve oil port of the valve to be tested, so that the operator can judge the current test condition. For the valve end cover plate group, the valve end cover plate group is composed of a plurality of sets of valve end cover plate pairs, usually more than two sets, and is specifically configured according to the specification of an object to be tested so as to meet the actual requirement; each set of valve end cover plate pair comprises a left side end cover plate 91 and a right side end cover plate 92 shown in fig. 2, which are used for replacing a left side valve end cover plate 021 on the valve 01 to be tested shown in fig. 1, and sealing the other side end part, for example, replacing the left and right side valve end cover plates of the valve 01 to be tested shown in fig. 1, so as to obtain a test valve 09 shown in fig. 2; the valve end cover plate pair differs from a normal valve end cover plate only in that each end cover plate is provided with a push rod passing hole, such as a push rod passing hole 910 and a push rod passing hole 920 shown in fig. 2.
Referring to fig. 6 to 12, the hydraulic testing device 3 includes a fixed support 4, and a pressure sensor, a transition valve block 6 and a displacement adjusting unit 5 mounted on the fixed support 4; a plurality of hydraulic oil pipes are arranged on the fixed support 4, one pipe end opening of each hydraulic oil pipe is arranged on the installation surface 400 of the fixed support to form a hydraulic pipe opening 40, and the other pipe end opening 402 is arranged on the side surface 401 and is connected with the hydraulic oil pipe 20 through a connector 41 fixedly arranged on the side surface 401. For the transition valve block group, the transition valve block group is composed of more than two transition valve blocks 6 with different specifications, the number of the transition valve blocks 6 with each specification is at least one, and more than two transition valve blocks can be arranged according to requirements for replacement use or standby.
Referring to fig. 6 to 12, the transition valve block 6 includes a valve block base 60 having a rectangular parallelepiped structure and a plurality of oil passages 61 arranged in the valve block base 60, one pipe port of each oil passage 61 is located on an upper surface of the rectangular parallelepiped structure to form a first butt oil port 610 in the present embodiment, and the other pipe port is located on a lower surface of the rectangular parallelepiped structure to form a second butt oil port 611 in the present embodiment, that is, the upper surface of the valve block base 60 forms a valve matching mounting surface in the present embodiment, and the lower surface forms a rack matching fixing surface in the present embodiment; in the testing process, the first butt oil ports 610 on the transition valve block 6 are used for butt joint with the valve oil ports on the valve body base 020 of the valve 01 to be tested and the valve 02 to be tested, namely, the first butt oil ports are matched with the valve oil ports in number and position, so that the valve 02 to be tested can be fixedly installed on the fixed support 4, and meanwhile, the valve oil ports on the fixed support 4 can be subjected to oil supply connection; for example, in order to adapt valve block bases with a different number of valve ports, a greater number of hydraulic ports 40 is provided on the fixed support 4 than or equal to the number of second docking ports 611 on each transition valve block 6. The side surface of the valve block base body 60 forms a pressure detection interface arrangement surface 608 in the present embodiment, and a plurality of oil pressure detection interfaces 609 are arranged on the pressure detection interface arrangement surface 608, the number of the oil pressure detection interfaces 609 is equal to the number of the first pair of oil receiving ports 610, and the oil pressure detection interfaces are correspondingly communicated with the first pair of oil receiving ports 610, so that the hydraulic oil pressure on the corresponding first pair of oil receiving ports 610 can be detected through the oil pressure detection interfaces, that is, the oil pressure of the corresponding valve ports on the valve body can be detected; in this embodiment, the hydraulic gauge 16 is in butt communication with a joint 65 fixed on the oil pressure detection interface 609 through a pipeline, so as to perform visual display, that is, the hydraulic gauge 16 constitutes a pressure detector in the hydraulic oil supply system of this embodiment, which is specifically used for acquiring the oil pressure at the oil pressure detection interface; for the hydraulic pressure gauge 16, a mechanical gauge or an electronic gauge may be used, or a pressure sensor may be directly used to construct a pressure detector and transmitted to the control unit through a communication line.
Referring to fig. 6 to 10, the displacement adjusting unit 5 includes a displacement conversion module and an adjusting driving motor 50; the displacement conversion module comprises a mounting seat 51 and a screw and nut mechanism 52 which is detachably mounted on the mounting seat 51; the mounting seat 51 is fixedly connected with the fixed support 4, and the mounting seat and the fixed support can be fixedly connected through screws, welding or the like and can also be manufactured in an integrated forming mode; in the lead screw nut mechanism 52, both ends of the lead screw 520 are rotatably supported by the mounting base 51, and the lead screw nut 521 is supported and limited by a rail slider mechanism and is laid on the mounting base 51; the adjustment driving motor 50 is used for driving the screw 520 to rotate, thereby driving the screw nut 521 to reciprocate along the axial direction.
Referring to fig. 6 to 10, on the fixed support 4, a pressure sensor, corresponding to a first pressure sensor 70 and a first pressure sensor 71, and a valve core push rod for pressing between each pressure sensor and the end surface of the valve core on the same side, corresponding to a first valve core push rod 72 and a second valve core push rod 73, are respectively arranged at the left end side and the right end side of the transition valve block 6; the first spool push rod 72 movably and watertightly passes through the push rod passing hole 910, and the second spool push rod 74 movably and watertightly passes through the push rod passing hole 920, specifically, a sealing member, such as an elastic ring, a sealing packing ring, or the like, is filled between the push rod passing hole and the outer circumferential surface of the spool push rod 72, thereby achieving a sealing effect. Of the two pressure sensors, the first pressure sensor 70 is fixedly mounted on the mover of the displacement adjusting unit 5, i.e., on the feed screw nut 521, i.e., the first pressure sensor 70 and the first spool push rod 72 together constitute a left end side force measuring sensor 81 as shown in fig. 13 to 15; the second pressure sensor 71 is movably mounted on the fixed support 4 through a guide rail slider mechanism 73, an elastic mechanism 75 is disposed between the second pressure sensor 71 and the fixed support 4, and an elastic restoring force of the elastic mechanism 75 is used for forcing the second spool push rod 74 to be in pressed and separated abutting connection with the spool end surface through the second pressure sensor 71, and is used for forcing the first spool push rod 72 to be in pressed and separated abutting connection with the spool end surface, that is, the second pressure sensor 71 and the second spool push rod 73 together form a right end side force measuring sensor 82 as shown in fig. 13 to 15. During operation, the valve core 04 is driven to move or move to the right by driving the feed screw nut 521 to move to the left or move to the right.
As for the elastic mechanism 75, a mechanism capable of providing an elastic restoring force, such as a tension spring, a pressure spring, a pair of permanent magnets arranged in opposite homopolar directions, or the like, may be specifically used to construct, in this embodiment, the elastic mechanism is configured as a pressure spring, and one end of the pressure spring abuts against the second pressure sensor 71, and the other end abuts against the fixed support 4, so as to simplify the specific structure; with the structure described above, the other end of the pressure spring can be indirectly pressed against the fixed support 4 through the linear displacement output device, so that the driving detection of the large displacement of the valve element 04 can be realized, that is, the stator of the linear displacement output device is fixed on the fixed support 4, and the other end of the pressure spring is pressed against the rotor of the linear displacement output device, so that a large elastic pressure can be kept on the end surface of the valve element in the process of the large displacement movement of the valve element, and the accuracy of the detection structure can be ensured.
In the testing process, the position and the moving displacement of the valve element 04 need to be monitored, and various displacement sensors can be used for detection, but in this embodiment, the laser displacement sensor 76 fixed on the mounting seat 51 is used for monitoring the position of the reflector 720 fixed on the first valve element push rod 72, so that the position and the displacement of the valve element 04 can be indirectly monitored. As shown in fig. 16, based on the above-mentioned testing method, the specific testing process performed by the testing system 1 includes the following matching modification step S1, matching installation step S2, pressure supply testing step S3, and numerical value calculating step S4.
A matching modification step S1, wherein a matching valve end cover plate pair and a matching transition valve block 6 matched with a valve body base 020 of the valve 01 to be tested are selected from the valve end cover plate group and the transition valve block group; the left and right side end cover plates are detached from the valve body base 020, and the matched valve end cover plate pairs are fixedly mounted on the left and right side end parts of the valve body base, so that the valve 01 to be tested is temporarily changed into a testing valve 09.
A matching mounting step S2, fixedly mounting the matching transition valve block 6 on the fixed support 4, and enabling the second butt joint oil port 611 to be in watertight butt joint with the hydraulic pipe orifice 40 distributed on the valve fixed support 4; fixedly mounting the test valve 09 on the valve matching fixed connection surface of the matching transition valve block 6, and enabling the first butt oil port 610 to be in watertight butt joint with the valve oil ports distributed on the test valve 09; a pressure sensor, namely a first pressure sensor 70 and a second pressure sensor 71 are respectively arranged on the left end side and the right end side of the test valve 09 on the fixed support 4, and a valve core push rod, namely a first valve core push rod 72 and a second valve core push rod 73, is arranged between each pressure sensor and the end surface of the valve core on the same side in a pressure equalizing manner; the valve core push rod can movably and watertight penetrate through the push rod through hole; of the two pressure sensors, one is fixedly mounted on the mover of the displacement adjustment unit 5, and the other is movably mounted on the fixed support 4 through the rail slider mechanism 73, and specifically, the second pressure sensor 71 is movably mounted on the fixed support 4 through the rail slider mechanism 73; an elastic mechanism 75 is arranged between the other and the fixed support 4, and the elastic restoring force of the elastic mechanism is used for forcing the valve core push rod to be tightly pressed and separately connected with the end face of the valve core in a butting manner, so that the force of the end face of the valve core can be tested in the process that the valve core 04 moves relative to the valve sleeve 03.
A pressure supply test step S3, in which hydraulic oil is supplied to the hydraulic pipe orifice 40 through the hydraulic oil pipe 20 by using the hydraulic oil supply system 2, so that hydraulic oil with a corresponding pressure is supplied to a valve port formed in the valve body base 020; then the displacement adjusting unit 5 is controlled to indirectly drive the valve core 04 to move rightwards relative to the valve sleeve 03 by a preset displacement, and the detected data read from the two pressure sensors are respectively F11And F21(ii) a And the displacement adjusting unit 5 is controlled to indirectly drive the valve core 04 to the left relative to the valve sleeve 03Moving a preset displacement, and reading the detection data on the two pressure sensors to be F respectively12And F22。
A numerical value calculation step S4, according to the formula F ═ F11+F12-F21-F22]2 calculating the valve core hydraulic power of the valve to be measured.
In the above embodiment, in order to test the parameter of the valve core hydraulic force based on the test device, it can also test the dynamic friction force; therefore, in the testing process, the transition valve block 6 is not needed, the oil pipe is directly connected to the valve oil port of the valve body, the transition valve block 6 is configured, the speed of batch testing can be increased, and the testing valve 09 with different specifications can be conveniently matched.
In addition, can also test other parameters based on above-mentioned test system and testing arrangement, for example can accomplish under different case apertures, different flow conditions and test servo proportion three-position four-way reversing valve's case hydrodynamic force to can obtain the law that its case hydrodynamic force changes along with factors such as case aperture, valve port pressure differential, the flow through the valve body, have in particular: (1) the method can measure six kinds of inlet and outlet oil ways of P-A-B-T, P-B-A-T, P-A, B-T, P-B, A-T respectively, adjust the pressure of the inlet and the outlet through ｃA proportional overflow valve, and compare the steady-state hydrodynamic coupling values of the bidirectional oil inlet and the unidirectional oil inlet and the bidirectional oil outlet; (2) the method comprises the steps of respectively measuring six inlet and outlet oil ways of P-A-B-T, P-B-A-T, P-A, B-T, P-B, A-T, adjusting the pressure of an inlet and an outlet through ｃA proportional overflow valve, analyzing and comparing steady-state hydrodynamic coupling values of ｃA bidirectional oil inlet and an unidirectional oil outlet, and obtaining the relation between hydrodynamic force received by ｃA valve core of the three-position four-way servo proportional control valve and the opening degree of the valve port, the pressure difference of the inlet and the outlet and the structural size of the valve core.
Claims (10)
1. A test method of valve core hydraulic force is characterized in that a test system with an improved structure is utilized to test a valve to be tested; the test system comprises a hydraulic oil supply system, a rack and a hydraulic power test device arranged on the rack; the hydraulic power testing device comprises a fixed support, and a pressure sensor and a displacement adjusting unit which are arranged on the fixed support; the testing system is characterized by comprising a valve end cover plate group; the hydrodynamic force testing device comprises a transition valve block group; the transition valve block group comprises a plurality of transition valve blocks, each transition valve block comprises a valve block base body and a plurality of oil passage channels arranged in the valve block base body, and a valve matching mounting surface and a rack matching fixed connection surface are arranged on the valve block base body; one pipe port of the oil passage is distributed on the valve matching mounting surface to form a first butt oil port, and the other pipe port is distributed on the rack matching fixed connection surface to form a second butt oil port; the valve end cover plate group comprises a plurality of sets of valve end cover plate pairs, each set of valve end cover plate pair comprises a left side end cover plate and a right side end cover plate, and each end cover plate is provided with a push rod through hole; the test method comprises the following steps:
a matching refitting step, namely selecting a matching valve end cover plate pair matched with the valve body base body of the valve to be tested from the valve end cover plate group and the transition valve block group and matching the transition valve block; disassembling a lower side end cover plate from the valve body base body, and fixedly installing the matched valve end cover plate pair on the left side end part and the right side end part of the valve body base body so as to temporarily modify the valve to be tested into a valve for testing;
a matching installation step, namely fixedly installing the matching transition valve block on the fixed support, and enabling the second butt joint oil port to be in watertight butt joint with a hydraulic pipe orifice distributed on the valve fixed support; fixedly mounting the testing valve on a valve matching fixed connection surface of the matching transition valve block, and enabling the first butt joint oil port to be in water-tight butt joint with a valve oil port distributed on the testing valve; the fixed support is provided with a pressure sensor at each of the left and right ends of the test valve, and a valve core push rod is arranged between each pressure sensor and the end face of the valve core at the same side in a pressure-sharing manner; the valve core push rod can movably and watertight penetrate through the push rod through hole; one of the two pressure sensors is fixedly mounted on a mover of the displacement adjustment unit, and the other is movably mounted on the fixed support through a guide rail slider mechanism; an elastic mechanism is arranged between the other one of the two fixed supports and the elastic restoring force of the elastic mechanism is used for forcing the valve core push rod to be tightly pressed and detachably connected with the end face of the valve core in a butting way;
a pressure supply testing step, wherein hydraulic oil is supplied to the hydraulic pipe orifice through a hydraulic oil pipe by using the hydraulic oil supply system; and then controlling the displacement adjusting unit to indirectly drive the valve core to move rightwards relative to the valve sleeve by preset displacement, and reading the detection data on the two pressure sensors to be F respectively11And F21(ii) a And controlling the displacement adjusting unit to indirectly drive the valve core to move leftwards relative to the valve sleeve by preset displacement, and reading detection data on the two pressure sensors to be respectively F12And F22；
A numerical calculation step according to the formula F ═ F11+F12-F21-F22]2 calculating the hydrodynamic force of the valve core of the valve to be measured.
2. The test method of claim 1, wherein:
the elastic mechanism is a pressure spring, one end of the pressure spring is pressed against the other end of the pressure spring, and the other end of the pressure spring is pressed against the fixed support;
a pressure detection interface laying surface is arranged on the valve block base body, and an oil pressure detection interface communicated with the first butt oil receiving port is laid on the pressure detection interface laying surface; the hydraulic oil supply system comprises a pressure detector for acquiring oil pressure at the oil pressure detection interface.
3. The test method according to claim 1 or 2, characterized in that:
the displacement adjusting unit comprises a displacement conversion module and an adjusting driving motor; the displacement conversion module comprises a mounting seat and a screw rod and nut mechanism which is detachably mounted on the mounting seat; in the screw rod nut mechanism, two end parts of a screw rod are rotatably supported on the mounting seat, and a screw rod nut is arranged on the mounting seat and is supported and limited by a guide rail sliding block mechanism; the adjusting driving motor is used for driving the screw rod to rotate; the one is fixedly arranged on the feed screw nut; and the mounting seat is provided with a laser displacement sensor for monitoring the position of a reflector fixedly arranged on the valve core push rod.
4. A method for testing the hydrodynamics of a valve element movably nested within a valve housing mounted within a valve body, the method comprising the steps of:
a left end side force detection sensor and a right end side force detection sensor which are connected with the end face of the valve core are arranged at the two ends of the valve core and are used for measuring the axial acting force borne by the two end faces of the valve core in the process that the valve core moves relative to the valve sleeve along the axial direction;
supplying hydraulic oil to a valve oil port on the valve body, applying resultant force to the valve core along the axial direction and towards the right through the left end side force detection sensor and the right end side force detection sensor to drive the valve core to move towards the right relative to the valve sleeve by a preset distance, and reading that the detection data on the left end side force detection sensor and the right end side force detection sensor correspond to F11And F21(ii) a Applying a resultant force to the valve core along the axial direction and towards the left through the left end side force detection sensor and the right end side force detection sensor to drive the valve core to move towards the left relative to the valve sleeve by a preset distance, and reading that the detection data on the left end side force detection sensor and the right end side force detection sensor correspond to F11And F21；
According to the formula F ═ F11+F12-F21-F22]2 calculating the hydrodynamic force of the valve core.
5. The test method of claim 4, wherein:
the left end side force detection sensor and the right end side force detection sensor are both pressure sensors and are used for detecting the thrust applied to the end face of the valve core when the valve core is pushed to move relative to the valve sleeve.
6. The test method according to claim 4 or 5, characterized in that:
a valve core push rod is pressed between the left end side force detection sensor and the left end face of the valve core, a valve core push rod is pressed between the right end side force detection sensor and the right end face of the valve core, and the two valve core push rods and the end faces of the valve cores are in pressed and separable abutting contact.
7. A valve core hydraulic power testing system comprises a hydraulic oil supply system, a rack and a hydraulic power testing device arranged on the rack; the hydraulic power testing device comprises a fixed support, and a pressure sensor and a displacement adjusting unit which are arranged on the fixed support; the method is characterized in that:
the test system comprises a valve end cover plate group; the hydrodynamic force testing device comprises a transition valve block group; the transition valve block group comprises a plurality of transition valve blocks and is used for fixedly mounting the valve to be tested on the fixed support; the transition valve block comprises a valve block base body and a plurality of oil path channels arranged in the valve block base body, and a valve matching mounting surface and a rack matching fixed connection surface are arranged on the valve block base body; one pipe port of the oil passage is arranged on the valve matching mounting surface to form a first butt joint oil port for detachably butting with a valve oil port arranged on the valve to be tested; the other pipe port of the oil passage is arranged on the matching and fixing surface of the rack to form a second butt joint oil port which is used for detachably butt joint with a hydraulic pipe orifice arranged on the fixed support; the valve end cover plate group comprises a plurality of sets of valve end cover plate pairs, and each set of valve end cover plate pair comprises a left side end cover plate and a right side end cover plate and is used for being mounted on the left end side and the right end side of a valve body base body of the valve to be tested; centering the valve end cover plates, wherein each end cover plate is provided with a push rod through hole;
the fixed support is provided with one pressure sensor and a valve core push rod for pressing between each pressure sensor and the end face of the valve core on the same side, wherein the pressure sensors are respectively arranged on the left side and the right side of the transition valve block; the valve core push rod can movably and watertight penetrate through the push rod through hole; one of the two pressure sensors is fixedly mounted on a mover of the displacement adjustment unit, and the other is movably mounted on the fixed support through a guide rail slider mechanism; an elastic mechanism is arranged between the other one of the two fixed supports and the elastic restoring force of the elastic mechanism is used for forcing the valve core push rod to be tightly pressed and detachably connected with the end face of the valve core in a butting way; the hydraulic oil supply system is used for supplying hydraulic oil to the hydraulic nozzle through a hydraulic oil pipe.
8. The test system of claim 7, wherein:
the elastic mechanism is a pressure spring, one end of the pressure spring is pressed against the other end of the pressure spring, and the other end of the pressure spring is pressed against the fixed support;
a pressure detection interface laying surface is arranged on the valve block base body, and an oil pressure detection interface communicated with the first butt oil receiving port is laid on the pressure detection interface laying surface; the hydraulic oil supply system comprises a pressure detector for acquiring oil pressure at the oil pressure detection interface.
9. The test system according to claim 7 or 8, wherein:
the displacement adjusting unit comprises a displacement conversion module and an adjusting driving motor; the displacement conversion module comprises a mounting seat and a screw rod and nut mechanism which is detachably mounted on the mounting seat; in the screw rod nut mechanism, two end parts of a screw rod are rotatably supported on the mounting seat, and a screw rod nut is arranged on the mounting seat and is supported and limited by a guide rail sliding block mechanism; the adjusting driving motor is used for driving the screw rod to rotate; the one is fixedly arranged on the feed screw nut; and the mounting seat is provided with a laser displacement sensor for monitoring the position of a reflector fixedly arranged on the valve core push rod.
10. The test system according to any one of claims 7 to 9, wherein:
the panel used for constructing the protective cover is fixedly arranged on the rack, and the display screen used for displaying the valve core hydraulic power measurement data and the measurement result and the oil pressure gauge used for displaying the oil pressure at the valve oil port of the valve to be measured are arranged on the front panel.
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