CN114412878B - Hydraulic match grinding table - Google Patents
Hydraulic match grinding table Download PDFInfo
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- CN114412878B CN114412878B CN202210089534.0A CN202210089534A CN114412878B CN 114412878 B CN114412878 B CN 114412878B CN 202210089534 A CN202210089534 A CN 202210089534A CN 114412878 B CN114412878 B CN 114412878B
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a hydraulic match grinding table, which relates to a hydraulic match grinding table for measuring the overlapping quantity of a slide valve pair of a servo valve and a using method thereof, and aims to solve the problems that the existing hydraulic match grinding table cannot simultaneously meet the measurement requirements of the slide valve pair with large flow and small flow and cannot measure curves of four sides in one slide valve formation, wherein the hydraulic match grinding table comprises a match grinding table clamp and a hydraulic system; the hydraulic system is fixed below the matched grinding table clamp; the matched grinding table clamp is used for fixing the slide valve pair to be detected, enabling a valve core of the slide valve pair to be detected to move and obtaining the displacement of the valve core; the hydraulic system comprises an oil pump, an oil tank, a pressure regulating module and a measuring module.
Description
Technical Field
The invention relates to a hydraulic match grinding table for measuring the overlap amount of a slide valve pair of a servo valve and a using method thereof.
Background
The servo valve for aerospace use is required to have a very strict overlap amount (also referred to as "overlap amount", "cover amount", or "cover amount") of its spool pair, and is usually 2 to 4 μm with a tolerance of ± 1 μm. The process of overlap match grinding is actually repeated to measure the overlap and grind the valve core until the design requirements are met. Since the grinding amount per pass is determined by the measurement result, the measurement accuracy of the overlap amount is directly related to the machining accuracy of the servo valve match grinding.
The existing hydraulic match grinding table cannot simultaneously meet the measurement of a large-flow and small-flow slide valve pair, and cannot measure curves of four sides in one slide valve stroke.
Disclosure of Invention
The invention aims to solve the problems that the existing hydraulic match grinding table cannot simultaneously meet the measurement requirements of a large-flow and small-flow slide valve pair and cannot measure curves of four edges in one slide valve formation, and the hydraulic match grinding table is provided.
The invention provides a hydraulic match grinding table, which comprises a match grinding table clamp and a hydraulic system;
the hydraulic system is fixed below the fixture of the grinding table;
the matched grinding table clamp is used for fixing the slide valve pair to be detected, enabling the valve core of the slide valve pair to be detected to move and obtaining the displacement of the valve core;
the hydraulic system comprises an oil pump, an oil tank, a pressure regulating module and a measuring module;
the oil pump comprises a first oil pump;
the pressure regulating module comprises a first check valve, a high-pressure filter, a main electromagnetic ball valve, a first electromagnetic ball valve, a second electromagnetic ball valve, a third electromagnetic ball valve, a fourth electromagnetic ball valve, an oil return electromagnetic ball valve and a proportional overflow valve;
the measuring module comprises a measuring pressure sensor, a total pressure sensor, a first pressure sensor, a second pressure sensor, a first flow sensor, a second flow sensor, a third flow sensor and a fourth flow sensor;
an oil inlet of a first oil pump is positioned in the oil tank, and an oil outlet of the first oil pump is connected with a first one-way valve, a high-pressure filter, a total electromagnetic ball valve and a total pressure sensor in sequence through pipelines and then is connected with an oil inlet of a to-be-detected slide valve pair;
an oil outlet of the slide valve pair to be tested is connected with an oil return electromagnetic ball valve through a pipeline and then is connected into an oil tank;
an oil inlet of the proportional overflow valve is connected with a pipeline between the high-pressure filter and the main electromagnetic ball valve after being connected with the pressure measuring sensor through a pipeline, and an oil return port of the proportional overflow valve is connected with an oil return filter through a pipeline and then is connected into an oil tank;
a first control port of the slide valve pair to be tested is respectively connected with a first electromagnetic ball valve and a first flow sensor in sequence through pipelines and then is connected into an oil tank, and is connected with a first pressure sensor, a second electromagnetic ball valve and a second flow sensor in sequence through pipelines and then is connected into the oil tank;
and a second control port of the slide valve pair to be tested is respectively connected with a third electromagnetic ball valve and a third flow sensor in sequence through pipelines and then is connected into the oil tank, and is connected with a second pressure sensor, a fourth electromagnetic ball valve and a fourth flow sensor in sequence through pipelines and then is connected into the oil tank.
The invention also provides a method for detecting a displacement flow value curve by using the hydraulic match grinding table, which comprises the step of obtaining a displacement-flow characteristic curve when the slide valve pair to be detected is a small flow valve, and the method comprises the following specific steps:
step S11, starting a first oil pump;
s12, pressure adjustment is carried out through a proportional overflow valve, so that the measured pressure is 2.5MPa;
s13, moving a valve core of the slide valve pair to be detected through a valve core axial micro-displacement mechanism, and when the readings of the first pressure sensor and the second pressure sensor are equal, indicating that the valve core of the slide valve pair to be detected is in the middle position;
s14, measuring the displacement of the valve core of the slide valve pair to be measured by a valve core displacement sensor measuring device in the moving process of the valve core of the slide valve pair to be measured;
and enabling the second electromagnetic ball valve and the fourth electromagnetic ball valve to be communicated, and enabling the second flow sensor and the fourth flow sensor to start working, displaying numbers on a corresponding digital display meter, and recording and obtaining a displacement-flow characteristic curve when the slide valve pair to be measured is a small-flow valve.
The invention also provides a method for measuring the zero leakage state of each valve port by using the hydraulic match grinding table, which comprises the following steps:
s31, enabling the first electromagnetic ball valve, the second electromagnetic ball valve, the third electromagnetic ball valve and the fourth electromagnetic ball valve to be all passages;
and S31, detecting the flow measured by the first flow sensor, the second flow sensor, the third flow sensor and the fourth flow sensor, and obtaining zero leakage of each valve port.
The invention has the beneficial effects that:
the measuring system adopts a flow measuring scheme of designing four flow sensors. Two types of flow sensors are used in the measuring oil circuit, so that the requirement for measuring the overlapping quantity of the large-flow servo valve and the small-flow servo valve can be met.
In order to improve the measurement efficiency of the overlapped quantity of the match grinding table, the oil circuit design scheme of the match grinding table adopts 1 total electromagnetic ball valve, 4 branch electromagnetic ball valves and 4 sets of flow sensors, and 4 curves of primary valve core stroke measurement are realized.
Drawings
FIG. 1 is a schematic structural view of a hydraulic match grinding table of the present invention;
FIG. 2 is a schematic diagram of a matching structure of a fixture of a hydraulic match grinding table and a hydraulic system in the hydraulic match grinding table of the invention;
fig. 3 is a schematic diagram of an oil path structure of a hydraulic system in the hydraulic match grinding table.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
In a first specific embodiment, the grinding machine comprises a grinding table clamp 1 and a hydraulic system 2;
the hydraulic system 2 is fixed below the matched grinding table clamp 1;
the matched grinding table clamp 1 is used for fixing the slide valve pair 3 to be tested, enabling the valve core of the slide valve pair 3 to be tested to move and obtaining the displacement of the valve core;
the hydraulic system 2 comprises an oil pump, an oil tank 2-2, a pressure regulating module and a measuring module;
the oil pump comprises a first oil pump 2-1;
the pressure regulating module comprises a first check valve 2-3, a high-pressure filter 2-4, a main electromagnetic ball valve 2-5, a first electromagnetic ball valve 2-6, a second electromagnetic ball valve 2-7, a third electromagnetic ball valve 2-8, a fourth electromagnetic ball valve 2-9, an oil return electromagnetic ball valve 2-10 and a proportional overflow valve 2-21;
the measuring module comprises measuring pressure sensors 2-11, total pressure sensors 2-12, first pressure sensors 2-13, second pressure sensors 2-14, first flow sensors 2-15, second flow sensors 2-16, third flow sensors 2-17 and fourth flow sensors 2-18;
an oil inlet of a first oil pump 2-1 is positioned in an oil tank 2-2, and an oil outlet of the first oil pump 2-1 is connected with an oil inlet of a to-be-detected sliding valve pair 3 after being sequentially connected with a first one-way valve 2-3, a high-pressure filter 2-4, a total electromagnetic ball valve 2-5 and a total pressure sensor 2-12 through pipelines;
an oil outlet of the slide valve pair 3 to be tested is connected with an oil return electromagnetic ball valve 2-10 through a pipeline and then is connected into an oil tank 2-2;
an oil inlet of the proportional overflow valve 2-21 is connected with a measuring pressure sensor 2-11 through a pipeline and then is connected with a pipeline between the high-pressure filter 2-4 and the main electromagnetic ball valve 2-5, and an oil return port of the proportional overflow valve 2-21 is connected with an oil return filter 2-22 through a pipeline and then is connected with an oil tank 2-2;
a first control port of the slide valve pair 3 to be tested is respectively connected with a first electromagnetic ball valve 2-6 and a first flow sensor 2-15 in sequence through pipelines and then is connected into an oil tank 2-2, and is connected with a first pressure sensor 2-13, a second electromagnetic ball valve 2-7 and a second flow sensor 2-16 in sequence through pipelines and then is connected into the oil tank 2-2;
and a second control port of the slide valve pair 3 to be tested is respectively connected with a third electromagnetic ball valve 2-8 and a third flow sensor 2-17 in sequence through pipelines and then is connected into the oil tank 2-2, and is connected with a second pressure sensor 2-14, a fourth electromagnetic ball valve 2-9 and a fourth flow sensor 2-18 in sequence through pipelines and then is connected into the oil tank 2-2.
Further, the oil pump comprises a second oil pump 2-19, and the pressure regulating module further comprises a second one-way valve 2-20;
the oil inlet of the second oil pump 2-19 is positioned in the oil tank 2-2, and the oil outlet of the second oil pump 2-19 is connected with the second one-way valve 2-20 through a pipeline and then connected with the high-pressure filter 2-4.
Further, the pressure regulating module also comprises a safety overflow valve 2-23;
the safety overflow valve 2-23 is connected with the proportional overflow valve 2-21 in parallel; one end of the safety overflow valve 2-23 is connected with the pressure measuring sensor 2-11 through a pipeline, and the other end is connected with the oil return filter 2-22 through a pipeline and then is connected with the oil tank 2-2.
Furthermore, the models of the first flow sensor 2-15 and the third flow sensor 2-17 are VS0.4, and the measuring range is 40L/min;
the model of the second flow sensor 2-16 and the fourth flow sensor 2-18 is VS0.04, and the measuring range is 4L/min.
Further, the jig 1 of the match grinding table comprises a base 1-1, a propelling centering mechanism 1-2, a valve core axial micro-displacement mechanism 1-3 and a valve core displacement sensor measuring device 1-4;
the propulsion centering mechanism 1-2 is fixed in the middle of the base 1-1, and the slide valve pair 3 to be tested is fixed above the propulsion centering mechanism 1-2;
the valve core axial micro-displacement mechanism 1-3 and the valve core displacement sensor measuring device 1-4 are respectively arranged at two sides of the propelling centering mechanism 1-2;
a valve core axial micro-displacement mechanism 1-3 for pushing the valve core of the slide valve pair 3 to be tested to move,
and the valve core displacement sensor measuring device 1-4 is used for obtaining the displacement of the valve core.
Further, the valve core axial micro-displacement mechanism 1-3 comprises a displacement device 1-3-1 and a first push rod 1-3-2;
the first push rod 1-3-2 is arranged at the top of the displacement device 1-3-1, and the long shaft of the first push rod 1-3-2 coaxially corresponds to the valve core of the slide valve pair 3 to be tested;
the bottom of the displacement device 1-3-1 is fixed on the base 1-1, and the displacement device 1-3-1 drives the first push rod 1-3-2 to do linear motion.
Further, the valve core displacement sensor measuring device 1-4 comprises a linear bearing 1-4-1, a second push rod 1-4-2, a displacement sensor 1-4-3 and a displacement sensor supporting seat 1-4-4;
the linear bearing 1-4-1 and the displacement sensor supporting seat 1-4-4 are fixed on the base 1-1;
one end of a second push rod 1-4-2 is in sliding fit with the linear bearing 1-4-1, the other end faces the slide valve pair 3 to be tested, and the long shaft of the second push rod 1-4-2 is coaxially corresponding to the valve core of the slide valve pair 3 to be tested;
the displacement sensor 1-4-3 is fixed on the displacement sensor support base 1-4-4, and the detection end of the displacement sensor 1-4-3 faces one end of the second push rod 1-4-2, so that when one end of the second push rod 1-4-2 pushes the detection end of the displacement sensor 1-4-3, the displacement of the second push rod 1-4-2 is detected.
Specifically, as shown in fig. 1, a jig 1 for a grinding table and a hydraulic system 2 are both fixed on a frame, the frame is designed in an integrated manner and is used for mounting a measuring mechanical frame, a main control computer, a control box, an instrument box, a part of oil-way systems (including an integrated block, a transition plate, a control element, a pipeline and the like), a printer, instrument equipment and the like, and a tool accessory cabinet is attached to a measuring table body.
The side plate of the table body is in a movable form, so that the table body is convenient to install and maintain. The operating table top is a stainless steel table top, and the table body is in a steel plate plastic spraying form, so that the appearance is attractive, elegant and durable.
As shown in figure 2, the jig of the match grinding table mainly comprises a base 1-1, a propulsion centering mechanism 1-2 and a clamping mechanism (a valve core axial micro-displacement mechanism 1-3 and a valve core displacement sensor measuring device 1-4). Wherein the left platform is used for a valve core displacement sensor measuring device 1-4; and a valve core axial micro-displacement mechanism 1-3 is arranged on the right platform. The slide valve process shell is fixed and clamped, and after the shell is strictly positioned, the shell is installed by using the installation hole of the shell through threads. And the transition of shells in different processes is realized by utilizing the transition block. Finally, the clamp part is completely arranged on the base 1-1 of the clamp and is connected with the manifold block (oil manifold block 23) through threads.
The clamping mechanism is fixed at the left end, the clamping mechanism is controlled to clamp in a mode that the right end moves, and the auxiliary tweezers are used for disassembling the valve core. The right end of the linear sliding rail platform (the displacement device 1-3-1) is provided with a linear sliding rail platform, the positioning precision is high, the abrasion is less, the precision can be maintained for a long time, the left side of the linear sliding rail platform is fixed, the positioning precision is ensured, and the convenience and the efficiency of replacing the valve core are greatly improved by means of a forceps auxiliary tool.
As shown in fig. 3, the hydraulic system comprises two parts, a pressure regulating system and a measuring system.
The pressure regulating system adopts the proportional relief valves 2-21 to realize pressure regulation, the acting object of the proportional electromagnets of the proportional relief valves 2-21 is not the mode of directly pushing the valve cores of the relief valves to work, but the outlet pressure of the proportional relief valves 2-21 is controlled, namely the pressure of a control plunger is controlled, so that the pressure of the proportional relief valves 2-21 can not be influenced by the flow change of fluid passing through the relief valves, and the proportional relief valves 2-21 are ensured to have good pressure-flow characteristics.
The measuring system adopts a scheme of designing flow measurement of four flow sensors. Two flow sensors (a first flow sensor, a second flow sensor, a third flow sensor, a fourth flow sensor and a fourth flow sensor) of VS0.04 and VS0.4 are used in the measuring oil circuit, wherein the measuring range of VS0.04 is 4L/min, and the measuring range of VS0.4 is 40L/min, so that the requirement of measuring the overlapping amount of the servo valve can be met. Meanwhile, the safety overflow valves 2 to 23 are adopted to ensure the safety of the pressure regulating system;
in order to improve the measurement efficiency of the overlapped quantity of the match grinding table, the oil path design scheme of the match grinding table adopts 1 total electromagnetic ball valve, 4 branch electromagnetic ball valves (2-5 total electromagnetic ball valves, 2-6 first electromagnetic ball valves, 2-7 second electromagnetic ball valves, 2-8 third electromagnetic ball valves and 2-9 fourth electromagnetic ball valves) and 4 sets of flow sensors (2-14 second pressure sensors, 2-15 first flow sensors, 2-16 second flow sensors, 2-17 third flow sensors and 2-18 fourth flow sensors) to realize 4 curves for measuring the stroke of the primary valve core.
Thus, the present device can measure/test the following quantities and curves:
1) The secondary lap amount of a spool valve of the servo valve;
2) Zero leakage and middle position comprehensive leakage of each valve port;
3) Obtaining a pressure gain curve based on the existing measurement method;
4) And measuring the displacement-flow value of the slide valve pair edge by edge, and outputting a displacement-flow characteristic curve.
Fig. 3 also includes: the oil level measuring device comprises a first oil suction filter screen 4-1, a second oil suction filter screen 5-1, a first bell-shaped cover coupling 7-1, a second bell-shaped cover coupling 10-1, a first motor 8-1, a second motor 11-1, a measuring pressure measuring joint 15-1, a total pressure measuring joint 15-2, a first pressure measuring joint 15-3, a second pressure measuring joint 15-4, an oil circuit integrated block 23, a liquid temperature sensor 25, a heater 26, a junction box 27, an oil cooler 28, an oil filling port 29 and an oil level meter 30.
In a second specific embodiment, the method for detecting a displacement flow value curve by using the hydraulic match grinding table, wherein the slide valve pair 3 to be detected is a small flow valve, and a displacement-flow characteristic curve is obtained, comprises the following specific steps:
step S11, starting a first oil pump 2-1;
s12, adjusting the pressure through a proportional overflow valve 2-21 so as to meet the measurement pressure of 2.5MPa; wherein the measuring pressure is measured by a measuring pressure sensor 2-11;
s13, moving the valve core of the slide valve pair 3 to be detected through the valve core axial micro-displacement mechanism 1-3, and when the readings of the first pressure sensor 2-13 and the second pressure sensor 2-14 are equal, indicating that the valve core of the slide valve pair 3 to be detected is in the middle position;
s14, measuring the displacement of the valve core of the slide valve pair 3 to be measured by the valve core displacement sensor measuring device 1-4 in the process of moving the valve core of the slide valve pair 3 to be measured;
and enabling the second electromagnetic ball valve 2-7 and the fourth electromagnetic ball valve 2-9 to be communicated, and the second flow sensor 2-16 and the fourth flow sensor 2-18 to start working, displaying numbers on a corresponding digital display meter, and recording and obtaining a displacement-flow characteristic curve when the slide valve pair 3 to be measured is a small flow valve.
In a third specific embodiment, the method for detecting the displacement flow value curve by using the hydraulic match grinding table obtains the displacement-flow characteristic curve when the slide valve pair 3 to be detected is a large flow valve, and comprises the following specific steps:
step S21, starting the first oil pump 2-1 and the second oil pump 2-19;
s22, adjusting the pressure through a proportional overflow valve 2-21 so as to meet the requirement of measuring pressure 2.5MPa; wherein the measuring pressure is measured by a measuring pressure sensor 2-11;
s23, moving the valve core of the slide valve pair 3 to be tested through the valve core axial micro-displacement mechanism 1-3, and when the readings of the first pressure sensor 2-13 and the second pressure sensor 2-14 are equal, indicating that the valve core of the slide valve pair 3 to be tested is in the middle position;
s24, measuring the displacement of the valve core of the slide valve pair 3 to be measured by the valve core displacement sensor measuring device 1-4 in the process of moving the valve core of the slide valve pair 3 to be measured;
and enabling the first electromagnetic ball valve 2-6 and the third electromagnetic ball valve 2-8 to be communicated, the first flow sensor 2-15 and the third flow sensor 2-17 to start working, displaying numbers on a corresponding digital display meter, and recording and obtaining a displacement-flow characteristic curve when the slide valve pair 3 to be measured is a large flow valve.
The method for measuring the zero leakage state of each valve port by using the hydraulic grinding table comprises the following specific steps:
s31, enabling the first electromagnetic ball valve 2-6, the second electromagnetic ball valve 2-7, the third electromagnetic ball valve 2-8 and the fourth electromagnetic ball valve 2-9 to be all passages;
and S31, detecting the flow measured by the first flow sensor 2-15, the second flow sensor 2-16, the third flow sensor 2-17 and the fourth flow sensor 2-18, and obtaining zero leakage of each valve port.
Specifically, when the small flow valve is detected, the first oil pump 2-1 is started; wherein, the small flow is defined as 0-10L/min;
pressure regulation is carried out through a proportional overflow valve 2-21 of the pressure regulating system, so that the measured pressure is 2.5MPa, and the safety of the pressure regulating system is ensured by adopting a safety valve;
during measurement, the valve core is moved from right to left, and when the first pressure sensor 2-13 and the second pressure sensor 2-14 are equal, the valve core is in a middle position;
and in the moving process of the valve core, the second electromagnetic ball valve 2-7 and the fourth electromagnetic ball valve 2-9 are communicated, the second flow sensor 2-16 and the fourth flow sensor 2-18 start to work, and the number is displayed on the digital display meter.
When a large flow valve is detected, starting the second oil pump 2-19; wherein, the large flow is defined as more than 10L/min;
pressure is adjusted through a proportional overflow valve 2-21 of the pressure adjusting system, so that the measured pressure is 2.5MPa, and the safety valve is adopted to ensure the safety of the pressure adjusting system;
during measurement, the valve core is moved from right to left, and when the first pressure sensor 2-13 and the second pressure sensor 2-14 are equal, the valve core is in a middle position;
in the moving process of the valve core, the first electromagnetic ball valve 2-6 and the third electromagnetic ball valve 2-8 are communicated, the first flow sensor 2-15 and the third flow sensor 2-17 start to work, and numbers are displayed on the digital display meter.
When the first electromagnetic ball valve 2-6, the second electromagnetic ball valve 2-7, the third electromagnetic ball valve 2-8 and the fourth electromagnetic ball valve 2-9 are all communicated, the zero leakage state of each valve port can be tested.
When the valve core moves, the computer collects the value of the displacement sensor and the value of the flow sensor and outputs a displacement-flow characteristic curve.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that various dependent claims and the features herein may be incorporated in other ways than as described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other embodiments.
Claims (4)
1. The method for detecting the displacement flow value curve by using the hydraulic grinding table comprises the steps that the hydraulic grinding table comprises a grinding table clamp (1) and a hydraulic system (2);
the hydraulic system (2) is fixed below the grinding table clamp (1);
the matched grinding table clamp (1) is used for fixing the slide valve pair (3) to be tested, enabling a valve core of the slide valve pair (3) to be tested to move and obtaining the displacement of the valve core;
the hydraulic system (2) comprises an oil pump, an oil tank (2-2), a pressure regulating module and a measuring module;
the oil pump comprises a first oil pump (2-1);
the pressure regulating module comprises a first one-way valve (2-3), a high-pressure filter (2-4), a main electromagnetic ball valve (2-5), a first electromagnetic ball valve (2-6), a second electromagnetic ball valve (2-7), a third electromagnetic ball valve (2-8), a fourth electromagnetic ball valve (2-9), an oil return electromagnetic ball valve (2-10) and a proportional overflow valve (2-21);
the measuring module comprises measuring pressure sensors (2-11), total pressure sensors (2-12), first pressure sensors (2-13), second pressure sensors (2-14), first flow sensors (2-15), second flow sensors (2-16), third flow sensors (2-17) and fourth flow sensors (2-18);
an oil inlet of a first oil pump (2-1) is positioned in an oil tank (2-2), and an oil outlet of the first oil pump (2-1) is connected with an oil inlet of a to-be-tested slide valve pair (3) after being sequentially connected with a first one-way valve (2-3), a high-pressure filter (2-4), a total electromagnetic ball valve (2-5) and a total pressure sensor (2-12) through pipelines;
an oil outlet of the slide valve pair (3) to be tested is connected with an oil return electromagnetic ball valve (2-10) through a pipeline and then is connected into an oil tank (2-2);
an oil inlet of the proportional overflow valve (2-21) is connected with a measuring pressure sensor (2-11) through a pipeline and then is connected with a pipeline between the high-pressure filter (2-4) and the main electromagnetic ball valve (2-5), and an oil return port of the proportional overflow valve (2-21) is connected with an oil return filter (2-22) through a pipeline and then is connected with an oil tank (2-2);
a first control port of the slide valve pair (3) to be tested is respectively connected with a first electromagnetic ball valve (2-6) and a first flow sensor (2-15) in sequence through pipelines and then is connected into an oil tank (2-2), and is connected with a first pressure sensor (2-13), a second electromagnetic ball valve (2-7) and a second flow sensor (2-16) in sequence through pipelines and then is connected into the oil tank (2-2);
a second control port of the slide valve pair to be tested (3) is respectively connected with a third electromagnetic ball valve (2-8) and a third flow sensor (2-17) in sequence through pipelines and then is connected into an oil tank (2-2), and is connected with a second pressure sensor (2-14), a fourth electromagnetic ball valve (2-9) and a fourth flow sensor (2-18) in sequence through pipelines and then is connected into the oil tank (2-2);
the oil pump comprises a second oil pump (2-19), and the pressure regulating module further comprises a second one-way valve (2-20);
the oil inlet of the second oil pump (2-19) is positioned in the oil tank (2-2), and the oil outlet of the second oil pump (2-19) is connected with the second one-way valve (2-20) through a pipeline and then is connected with the high-pressure filter (2-4);
the pressure regulating module also comprises a safety overflow valve (2-23);
the safety overflow valve (2-23) is connected with the proportional overflow valve (2-21) in parallel; one end of the safety overflow valve (2-23) is connected with a pressure measuring sensor (2-11) through a pipeline, and the other end of the safety overflow valve is connected with an oil return filter (2-22) through a pipeline and then is connected into an oil tank (2-2);
the models of the first flow sensor (2-15) and the third flow sensor (2-17) are VS0.4, and the measuring range is 40L/min;
the model of the second flow sensor (2-16) and the model of the fourth flow sensor (2-18) are VS0.04, and the measuring range is 4L/min;
the method is characterized in that when the slide valve pair (3) to be tested is a small-flow valve, a displacement-flow characteristic curve is obtained, and the method comprises the following specific steps:
step S11, starting a first oil pump (2-1);
s12, pressure adjustment is carried out through a proportional overflow valve (2-21), so that the measured pressure is 2.5MPa;
s13, moving a valve core of the slide valve pair (3) to be detected through the valve core axial micro-displacement mechanism (1-3), and indicating that the valve core of the slide valve pair (3) to be detected is in a middle position when the readings of the first pressure sensor (2-13) and the second pressure sensor (2-14) are equal;
s14, measuring the displacement of the valve core of the slide valve pair (3) to be measured by the valve core displacement sensor measuring device (1-4) in the process of moving the valve core of the slide valve pair (3) to be measured;
enabling the second electromagnetic ball valve (2-7) and the fourth electromagnetic ball valve (2-9) to be communicated, enabling the second flow sensor (2-16) and the fourth flow sensor (2-18) to start working, displaying numbers on a corresponding digital display meter, and recording and obtaining a displacement-flow characteristic curve when the slide valve pair (3) to be measured is a small-flow valve;
or when the slide valve pair (3) to be tested is a large flow valve, the method for obtaining the displacement-flow characteristic curve comprises the following specific steps:
step S21, starting the first oil pump (2-1) and the second oil pump (2-19);
s22, pressure adjustment is carried out through a proportional overflow valve (2-21), so that the measured pressure is 2.5MPa;
s23, moving a valve core of the slide valve pair (3) to be detected through the valve core axial micro-displacement mechanism (1-3), and indicating that the valve core of the slide valve pair (3) to be detected is in the middle position when the readings of the first pressure sensor (2-13) and the second pressure sensor (2-14) are equal;
s24, measuring the displacement of the valve core of the slide valve pair (3) to be measured by the valve core displacement sensor measuring device (1-4) in the process of moving the valve core of the slide valve pair (3) to be measured;
and enabling the first electromagnetic ball valve (2-6) and the third electromagnetic ball valve (2-8) to be communicated, the first flow sensor (2-15) and the third flow sensor (2-17) to start working, displaying numbers on a corresponding digital display meter, and recording and obtaining a displacement-flow characteristic curve when the slide valve pair (3) to be tested is a large flow valve.
2. The method for detecting the displacement flow value curve by using the hydraulic match grinding table according to claim 1, wherein the match grinding table clamp (1) comprises a base (1-1), a propelling and centering mechanism (1-2), a valve core axial micro-displacement mechanism (1-3) and a valve core displacement sensor measuring device (1-4);
the propelling centering mechanism (1-2) is fixed in the middle of the base (1-1), and the slide valve pair (3) to be tested is fixed above the propelling centering mechanism (1-2);
the valve core axial micro-displacement mechanism (1-3) and the valve core displacement sensor measuring device (1-4) are respectively arranged at two sides of the propelling centering mechanism (1-2);
the valve core axial micro-displacement mechanism (1-3) is used for pushing the valve core of the slide valve pair (3) to be tested to move,
and the valve core displacement sensor measuring device (1-4) is used for obtaining the displacement of the valve core.
3. The method for detecting a displacement flow value curve by using a hydraulic match grinding table according to claim 2, characterized in that the spool axial micro-displacement mechanism (1-3) comprises a displacement device (1-3-1) and a first push rod (1-3-2);
the first push rod (1-3-2) is arranged at the top of the displacement device (1-3-1), and the long shaft of the first push rod (1-3-2) coaxially corresponds to a valve core of the slide valve pair (3) to be detected;
the bottom of the displacement device (1-3-1) is fixed on the base (1-1), and the displacement device (1-3-1) drives the first push rod (1-3-2) to do linear motion.
4. A method for detecting displacement flow value curve using a hydrodynamic grinding table according to claim 3, characterized in that the spool displacement sensor measuring device (1-4) comprises a linear bearing (1-4-1), a second push rod (1-4-2), a displacement sensor (1-4-3) and a displacement sensor support seat (1-4-4);
the linear bearing (1-4-1) and the displacement sensor supporting seat (1-4-4) are fixed on the base (1-1);
one end of the second push rod (1-4-2) is in sliding fit with the linear bearing (1-4-1), the other end of the second push rod faces the sliding valve pair (3) to be tested, and the long shaft of the second push rod (1-4-2) coaxially corresponds to the valve core of the sliding valve pair (3) to be tested;
the displacement sensor (1-4-3) is fixed on the displacement sensor support seat (1-4-4), and the detection end of the displacement sensor (1-4-3) faces one end of the second push rod (1-4-2), so that the displacement of the second push rod (1-4-2) is detected when one end of the second push rod (1-4-2) pushes the detection end of the displacement sensor (1-4-3).
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|---|---|---|---|---|
| CN2745059Y (en) * | 2004-06-30 | 2005-12-07 | 宝山钢铁股份有限公司 | Four-way three-step servo valve core and valve pocket detecting device |
| CN108591183A (en) * | 2018-05-31 | 2018-09-28 | 武汉格航帆科技有限公司 | A kind of electrohydraulic servo valve overlapping amount air measuring device and method |
| CN110360187A (en) * | 2019-08-26 | 2019-10-22 | 上海衡拓液压控制技术有限公司 | Jet pipe type Servo Valve's Slide Valve axial direction match grinding and zero characteristic test device |
| CN111503090A (en) * | 2020-04-27 | 2020-08-07 | 华中科技大学 | Electro-hydraulic servo valve superposition amount rapid pneumatic measurement gas circuit and measurement method |
| CN212509068U (en) * | 2020-07-08 | 2021-02-09 | 浙江理工大学 | Hydraulic measurement device for superposition quantity of servo proportional valve |
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2022
- 2022-01-25 CN CN202210089534.0A patent/CN114412878B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745059Y (en) * | 2004-06-30 | 2005-12-07 | 宝山钢铁股份有限公司 | Four-way three-step servo valve core and valve pocket detecting device |
| CN108591183A (en) * | 2018-05-31 | 2018-09-28 | 武汉格航帆科技有限公司 | A kind of electrohydraulic servo valve overlapping amount air measuring device and method |
| CN110360187A (en) * | 2019-08-26 | 2019-10-22 | 上海衡拓液压控制技术有限公司 | Jet pipe type Servo Valve's Slide Valve axial direction match grinding and zero characteristic test device |
| CN111503090A (en) * | 2020-04-27 | 2020-08-07 | 华中科技大学 | Electro-hydraulic servo valve superposition amount rapid pneumatic measurement gas circuit and measurement method |
| CN212509068U (en) * | 2020-07-08 | 2021-02-09 | 浙江理工大学 | Hydraulic measurement device for superposition quantity of servo proportional valve |
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