CN212509068U - Hydraulic measurement device for superposition quantity of servo proportional valve - Google Patents
Hydraulic measurement device for superposition quantity of servo proportional valve Download PDFInfo
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- CN212509068U CN212509068U CN202021323946.9U CN202021323946U CN212509068U CN 212509068 U CN212509068 U CN 212509068U CN 202021323946 U CN202021323946 U CN 202021323946U CN 212509068 U CN212509068 U CN 212509068U
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Abstract
The invention discloses a hydraulic measuring device for superposition quantity of a servo proportional valve. At present, the superposition measurement of the servo proportional valve is mainly manual, the requirement on the skill of workers is high, and the measurement efficiency is low. The device comprises a test board base, a transition block, a first push rod, a first end cover, a second end cover, a spring, a second push rod, an adjusting nut and a displacement sensor; the transition block and the displacement sensor are fixed on the base of the test bench; the first push rod is sleeved in the mounting hole of the first end cover; a spring is sleeved on the second push rod, and the second push rod is sleeved in the mounting hole of the second end cover; the adjusting nut is connected with the push rod two-way through a thread pair; the valve core driving component drives the first push rod; the transition block, the test board base and the valve assembly to be tested are communicated through a hydraulic measurement oil way system. The invention has high measurement precision, realizes the measurement of the superposition quantity of the servo proportional valves with various specifications by replacing the transition block, and reduces the operation requirement; the differential pressure of each valve port of the slide valve assembly can be kept unchanged, so that the detection accuracy of the flow-displacement relation is ensured.
Description
Technical Field
The utility model belongs to the technical field of servo proportional valve, concretely relates to servo proportional valve coincide volume measuring device that surges.
Background
Servo proportional valves have found very wide application in electro-hydraulic control systems. The process manufacturing precision requirement is high, the difficulty is high, and the measurement of the overlapping amount of the servo proportional valve is the difficulty of the process manufacturing process. The superposition quantity of the servo proportional valve refers to the axial fit size of the working edge of the valve core boss and the opening of the valve sleeve when the valve core is in the middle position of the valve sleeve. The superposition amount of the servo proportional valve is generally required to be 3-5 mu m, the repeated measurement precision is required to be within +/-0.5 mu m, and the precision requirement is difficult to achieve by the existing measurement method. The existing measuring method mainly adopts manual operation as a main operation, so that the measurement repeatability and reliability are difficult to ensure, the operation is inconvenient, the requirement on the skill of workers is high, and the measurement efficiency is low.
Disclosure of Invention
Not enough to prior art, the utility model aims to provide a servo proportional valve coincide volume measuring device that surges, its measurement accuracy, repeatability, reliability meet the demands, require lowly to workman's technical ability, and measurement of efficiency is high.
The utility model adopts the technical proposal that:
the utility model comprises a test board base, a valve core driving component, a transition block, a first push rod, a first end cover, a second end cover, a spring, a second push rod, an adjusting nut, a displacement sensor, a hydraulic measurement oil circuit system, a data acquisition card and an industrial personal computer; the transition block and the displacement sensor are fixed on the base of the test bench; the signal output end of the displacement sensor is connected with the signal input end of the acquisition card, and the industrial personal computer is connected with the signal output end of the data acquisition card; the transition block is positioned by a shoulder which is perpendicular to the axis of the displacement sensor and arranged on the base of the test bench, and the top surface of the transition block is provided with the shoulder which is perpendicular to the axis of the displacement sensor; the first push rod is sleeved in the mounting hole of the first end cover; a spring is sleeved on the second push rod, and the second push rod is sleeved in the mounting hole of the second end cover; sealing rings are arranged in the mounting holes of the first end cover and the second end cover; the push rod I and the push rod II are provided with integrally formed shoulders; the adjusting nut is connected with the push rod two-way through a thread pair. The valve core driving assembly comprises a harmonic speed reducing motor, a coupler, a ball screw and a driving block; the harmonic speed reducing motor is controlled by an industrial personal computer, and the signal output end of the harmonic speed reducing motor is connected with a data acquisition card; the base body of the harmonic speed reducing motor is fixed with the base of the test bench, and the output shaft of the harmonic speed reducing motor is connected with the screw of the ball screw through an elastic coupling; a nut of the ball screw is fixed with the driving block; the driving block and a guide rod fixed on the base of the test bench form a sliding pair.
The top surface of the base of the test bench is provided with two P-port channels, two A-port channels, two B-port channels and two T-port channels; the transition block has two specifications, the top surface and the bottom surface of the transition block with one specification are respectively provided with a P port channel, an A port channel, a B port channel and a T port channel, and the side surface is provided with four pressure test holes; the top surface and the bottom surface of the transition block in the other specification are respectively provided with a P port channel, an A port channel, a B port channel and a T port channel, the side surface of the transition block is provided with four pressure test holes, and the number of the T port channels on the top surface is two; the top ends of the P port channel and the A port channel box B port channel on the bottom surface of the transition block are respectively connected with the bottom ends of the P port channel, the A port channel and the B port channel on the top surface; when only one T-port channel is arranged on the top surface of the transition block, the bottom end of the T-port channel is communicated with the top ends of the two T-port channels on the bottom surface of the transition block; when the top surface of the transition block is provided with two T-port channels, the bottom ends of the two T-port channels are respectively communicated with the top ends of the two T-port channels on the bottom surface of the transition block; the layout of the P port channel, the A port channel, the B port channel and the T port channel on the bottom surface of the transition block is completely consistent with that of the P port channel, the A port channel, the B port channel and the T port channel on the base of the test board; sealing rings are arranged at the top ends of the P port channel, the A port channel, the B port channel and the T port channel on the top surface of the transition block and the top ends of the P port channel, the A port channel, the B port channel and the T port channel on the base of the test bench; the outer end of the pressure test hole is provided with a sealing ring; the inner ends of the four pressure test holes are respectively communicated with a port P channel, a port A channel, a port B channel and one port T channel on the bottom surface of the transition block.
The hydraulic measurement oil path system comprises an oil tank, a filter, a safety valve, a constant delivery pump, a one-way valve, an energy accumulator, a stop valve, a proportional overflow valve, a first electromagnetic ball valve, a second electromagnetic ball valve, a third electromagnetic ball valve, a fourth electromagnetic ball valve, a fifth electromagnetic ball valve, a sixth electromagnetic ball valve, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a small-range gear flowmeter and a large-range gear flowmeter; the signal output ends of the first pressure sensor, the second pressure sensor, the third pressure sensor, the fourth pressure sensor, the small-range gear flowmeter and the large-range gear flowmeter are connected with a data acquisition card, and the oil cooler, the proportional overflow valve, the first electromagnetic ball valve, the second electromagnetic ball valve, the third electromagnetic ball valve, the fourth electromagnetic ball valve, the fifth electromagnetic ball valve and the sixth electromagnetic ball valve are controlled by an industrial personal computer. The inlet of the constant delivery pump is connected with the outlet of the oil tank through a filter, and the constant delivery pump is driven by a motor; the outlet of the fixed displacement pump is connected with the inlet of the one-way valve, and the outlet of the one-way valve is connected with the inlet of the safety valve, the inlet of the stop valve and the oil through port of the energy accumulator; the outlet of the safety valve is connected with the inlet of the oil tank; the outlet of the stop valve is connected with the inlet of the proportional overflow valve, the inlet of the first electromagnetic ball valve and the inlet of the second electromagnetic ball valve after being connected with the two filters in series; the outlet of the proportional overflow valve is connected with the inlet of the oil tank; a first pressure sensor is arranged at an outlet of the first electromagnetic ball valve, and a second pressure sensor is arranged at an outlet of the second electromagnetic ball valve; a third pressure sensor is arranged at the inlet of the third electromagnetic ball valve, and a fourth pressure sensor is arranged at the inlet of the fourth electromagnetic ball valve; an outlet of the electromagnetic ball valve III is connected with an inlet of the electromagnetic ball valve V, an outlet of the electromagnetic ball valve IV is connected with an inlet of the electromagnetic ball valve VI, and an outlet of the electromagnetic ball valve III is connected with an outlet of the electromagnetic ball valve IV; an outlet of the electromagnetic ball valve V is connected with an inlet of the oil tank through a small-range gear flowmeter; and an outlet of the electromagnetic ball valve six is connected with an inlet of the oil tank through a wide-range gear flowmeter.
The driving block is provided with an integrally formed force application rod.
The inlet of the constant delivery pump is provided with a temperature sensor, and the signal output end of the temperature sensor is connected with a data acquisition card.
And a liquid level meter is arranged at an inlet of the oil tank.
And the inlet of the oil tank is connected with the outlet of the oil tank through an oil cooler.
The utility model has the advantages that: (1) the base of the test bench is designed into a whole, and the transition block and the base of the test bench, and the valve assembly to be tested and the transition block are positioned by shoulders, so that the measurement error caused by installation is reduced, and the measurement precision is improved; (2) by replacing the transition block, the measurement of the superposition amount of the servo proportional valves with various sizes and specifications can be simply and conveniently realized, and the operation requirement is reduced; (3) the valve seat of the valve to be tested is a valve body matched with the servo proportional valve, so that pressure change caused by different flow passage structures is avoided, and meanwhile, end covers are additionally arranged at two ends of the valve body, so that flow measurement errors caused by oil leakage are prevented; (4) and the pressure sensors are used for detecting the pressure difference of each valve port of the slide valve assembly, and the pressure difference of each valve port of the slide valve assembly is ensured to be kept unchanged through the feedback adjustment of the proportional overflow valve, so that the pressure loss caused by other elements is prevented from influencing the pressure difference of each valve port of the slide valve assembly, and the detection accuracy of the flow-displacement relation is further influenced.
Drawings
Fig. 1 is a perspective view of the utility model for measuring the overlapping amount of the servo proportional valve.
Fig. 2 is a cross-sectional view of the utility model for measuring the overlapping amount of the servo proportional valve.
Fig. 3 is a perspective view of the transition block of the present invention.
Fig. 4 is a schematic diagram of the hydraulic measurement oil circuit system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, a hydraulic measuring device for superposition of a servo proportional valve comprises a test bench base 1, a valve core driving component 2, a transition block 3, a first push rod 4.1, a first end cover 4.2, a second end cover 4.5, a spring 4.6, a second push rod 4.7, an adjusting nut 4.8, a displacement sensor 5, a hydraulic measuring oil circuit system 6, a data acquisition card and an industrial personal computer; the transition block 3 and the displacement sensor 5 are both fixed on the test bench base 1; the signal output end of the displacement sensor 5 is connected with the signal input end of the acquisition card, and the industrial personal computer is connected with the signal output end of the data acquisition card; the transition block 3 is positioned by a shoulder perpendicular to the axis of the displacement sensor 5 on the test board base 1, and the top surface of the transition block 3 is provided with the shoulder perpendicular to the axis of the displacement sensor 5, so that the parallelism between the moving direction of the valve core and the moving direction of the displacement sensor 5 is ensured, and the displacement measurement error is reduced; the first push rod 4.1 is sleeved in the mounting hole of the first end cover 4.2; a spring 4.6 is sleeved on the second push rod 4.7, and the second push rod 4.7 is sleeved in the mounting hole of the second end cover 4.5; sealing rings are arranged in the mounting holes of the first end cover 4.2 and the second end cover 4.5; an integrally formed shoulder is arranged on the second push rod 4.7 to limit the maximum moving displacement of the second push rod and prevent the displacement sensor 5 from overranging; an integrally formed shoulder is arranged on the first push rod and used for positioning a valve core in the sliding valve assembly; the adjusting nut 4.8 is connected with the second push rod 4.7 through a thread pair. The valve core driving component 2 comprises a harmonic speed reducing motor 2.1, a coupler 2.2, a ball screw 2.3 and a driving block 2.4; the harmonic speed reducing motor 2.1 is controlled by an industrial personal computer by adopting pulse, and the signal output end of the harmonic speed reducing motor 2.1 is connected with a data acquisition card; the seat body of the harmonic speed reducing motor 2.1 is fixed with the test bench base 1, and the output shaft of the harmonic speed reducing motor 2.1 is connected with the screw of the ball screw 2.3 through the elastic coupling 2.2; the nut of the ball screw 2.3 is fixed with the driving block 2.4; the driving block 2.4 and a guide rod fixed on the base 1 of the test bench form a sliding pair; the driving block 2.4 is provided with an integrally formed force application rod.
The top surface of the test board base 1 is provided with two P port channels, two A port channels, two B port channels and two T port channels; the transition block 3 has two specifications and can be replaced to meet the requirement of superposition measurement of the servo proportional valve in a six-path valve form and a ten-path valve form; as shown in fig. 3, the top surface and the bottom surface of the transition block adapted to the six-way valve form are respectively provided with a port P channel, a port a channel, a port B channel and a port T channel, and the side surface is provided with four pressure test holes; the top surface and the bottom surface of the transition block suitable for the ten-path valve are provided with a P port channel, an A port channel, a B port channel and a T port channel, the side surface is provided with four pressure test holes, and the number of the T port channels on the top surface is two; the top ends of the P port channel and the A port channel box B port channel on the bottom surface of the transition block are respectively connected with the bottom ends of the P port channel, the A port channel and the B port channel on the top surface; when only one T-port channel is arranged on the top surface of the transition block, the bottom end of the T-port channel is communicated with the top ends of the two T-port channels on the bottom surface of the transition block; when the top surface of the transition block is provided with two T-port channels, the bottom ends of the two T-port channels are respectively communicated with the top ends of the two T-port channels on the bottom surface of the transition block; the layout of the P port channel, the A port channel, the B port channel and the T port channel on the bottom surface of the transition block is completely consistent with that of the P port channel, the A port channel, the B port channel and the T port channel of the test bed base 1; sealing rings are arranged at the top ends of the P port channel, the A port channel, the B port channel and the T port channel on the top surface of the transition block and the top ends of the P port channel, the A port channel, the B port channel and the T port channel of the test board base 1; the outer end of the pressure test hole is provided with a sealing ring; the inner ends of the four pressure test holes are respectively communicated with a port P channel, a port A channel, a port B channel and one port T channel on the bottom surface of the transition block.
As shown in fig. 4, the hydraulic measurement oil path system 6 is composed of an oil tank, a temperature sensor 6.1, a filter 6.2, an oil cooler 6.3, a safety valve 6.4, a liquid level meter 6.5, a dosing pump 6.6, a check valve 6.7, an energy accumulator 6.8, a stop valve 6.9, a proportional overflow valve 6.10, a first electromagnetic ball valve 6.11, a second electromagnetic ball valve 6.12, a third electromagnetic ball valve 6.17, a fourth electromagnetic ball valve 6.18, a fifth electromagnetic ball valve 6.19, a sixth electromagnetic ball valve 6.20, a first pressure sensor 6.13, a second pressure sensor 6.14, a third pressure sensor 6.15, a fourth pressure sensor 6.16, a small-range gear flow meter 6.21 and a large-range gear flow meter 6.22; the signal output ends of the temperature sensor 6.1, the pressure sensor I6.13, the pressure sensor II 6.14, the pressure sensor III 6.15, the pressure sensor IV 6.16, the small-range gear flowmeter 6.21 and the large-range gear flowmeter 6.22 are all connected with a data acquisition card, and the oil cooler 6.3, the proportional overflow valve 6.10, the electromagnetic ball valve I6.11, the electromagnetic ball valve II 6.12, the electromagnetic ball valve III 6.17, the electromagnetic ball valve IV 6.18, the electromagnetic ball valve V6.19 and the electromagnetic ball valve VI 6.20 are all controlled by an industrial personal computer. The inlet of the constant delivery pump 6.6 is connected with the outlet of the oil tank through a filter 6.2, the constant delivery pump 6.6 is driven by a motor, and a temperature sensor 6.1 is arranged at the inlet of the constant delivery pump 6.6; the outlet of the fixed displacement pump 6.6 is connected with the inlet of the one-way valve 6.7, and the outlet of the one-way valve 6.7 is connected with the inlet of the safety valve 6.4, the inlet of the stop valve 6.9 and the oil through port of the energy accumulator 6.8; the outlet of the safety valve 6.4 is connected with the inlet of the oil tank, and the inlet of the oil tank is provided with a liquid level meter 6.5; the oil cooler 6.3 is connected with the inlet of the oil tank and the outlet of the oil tank; the outlet of the stop valve 6.9 is connected with the inlet of the proportional overflow valve 6.10, the inlet of the first electromagnetic ball valve 6.11 and the inlet of the second electromagnetic ball valve 6.12 after being connected with two filters in series; the outlet of the proportional overflow valve 6.10 is connected with the inlet of the oil tank; a first pressure sensor 6.13 is arranged at the outlet of the first electromagnetic ball valve 6.11, and a second pressure sensor 6.14 is arranged at the outlet of the second electromagnetic ball valve 6.12; a third pressure sensor 6.15 is arranged at the inlet of the third electromagnetic ball valve 6.17, and a fourth pressure sensor 6.16 is arranged at the inlet of the fourth electromagnetic ball valve 6.18; the outlet of the electromagnetic ball valve III 6.17 is connected with the inlet of the electromagnetic ball valve V6.19, the outlet of the electromagnetic ball valve IV 6.18 is connected with the inlet of the electromagnetic ball valve VI 6.20, and the outlet of the electromagnetic ball valve III 6.17 is connected with the outlet of the electromagnetic ball valve IV 6.18; an outlet of the five electromagnetic ball valve 6.19 is connected with an inlet of the oil tank through a small-range gear flowmeter 6.21; the outlet of the electromagnetic ball valve six 6.20 is connected with the inlet of the oil tank through a wide range gear flowmeter 6.22.
Use the utility model discloses measure servo proportional valve superimposed quantity's step as follows:
(1) installing a slide valve assembly: the slide valve assembly comprises a slide valve pair 4.4 and a valve seat 4.3; the slide valve pair 4.4 consists of a valve core and a valve sleeve; the valve core is arranged in the valve sleeve in a penetrating mode, the valve sleeve is arranged in the valve seat 4.3, the first end cover 4.2 is fastened with the valve seat 4.3 through screws, the second end cover 4.5 is fastened with the valve seat 4.3 through screws, so that the first end cover 4.2 and the second end cover 4.5 tightly press two ends of the valve sleeve, two ends of the spring 4.6 tightly press the second end cover 4.5 and the valve core respectively, a shoulder integrally formed on the first push rod is abutted to the first end cover, and two ends of the valve core are respectively contacted with the first push rod and the second; then, a valve seat 4.3 of a slide valve component 4 to be measured is fastened on the transition block 3 through screws, a P port channel, an A port channel and a B port channel on the bottom surface of the transition block are respectively communicated with a P port channel, an A port channel and a B port channel of the test bench base 1, the bottom ends of the two T port channels on the bottom surface of the transition block are respectively communicated with the top ends of the two T port channels of the test bench base 1, and meanwhile, the force application rod, the push rod I4.1, the valve core, the push rod II 4.7 and the displacement sensor 5 are coaxially arranged through the positioning of a shoulder on the transition block 3 on the valve seat 4.3, so that when the driving block 2.4 pushes the push rod I4.1 to move, the displacement of the push rod II is ensured to be the same as the displacement of the valve core, and the movement direction of the valve core is ensured; and finally, connecting the pressure test hole communicated with the P port channel with a first pressure sensor 6.13 through a pressure measuring hose, connecting the pressure test hole communicated with the A port channel with a third pressure sensor 6.15 through a pressure measuring hose, connecting the pressure test hole communicated with the B port channel with a fourth pressure sensor 6.16 through a pressure measuring hose, and connecting the pressure test hole communicated with the T port channel with a second pressure sensor 6.14 through a pressure measuring hose.
(2) Clamping and positioning the valve core: rotating the adjusting nut 4.8 to enable the adjusting nut 4.8 to be in contact with the displacement sensor 5; and then, starting the industrial personal computer, enabling the industrial personal computer to send a pulse signal to the harmonic wave speed reduction motor 2.1, driving the driving block 2.4 to move towards the direction close to the first 4.1 of the push rod, and stopping when the reading of the displacement sensor 5 displayed on the industrial personal computer begins to increase, so as to finish the clamping and positioning of the valve core.
(3) Measuring the amount of superposition: firstly, a constant delivery pump 6.6 works, a stop valve 6.9 is opened, a first electromagnetic ball valve 6.11, a fourth electromagnetic ball valve 6.18 and a sixth electromagnetic ball valve 6.20 are opened, a second electromagnetic ball valve 6.12, a third electromagnetic ball valve 6.17 and a fifth electromagnetic ball valve 6.19 are closed, a harmonic speed reducing motor 2.1 is controlled by an industrial personal computer to push a valve core of a slide valve pair 4.4 to be tested to move, a displacement sensor 5 measures the displacement of the valve core of the slide valve pair 4.4 to be tested, and a wide range gear flowmeter 6.22 measures the flow from a port P (oil inlet) to a port B (working oil port) of a slide valve assembly; closing an electromagnetic ball valve six 6.20 when the slide valve pair to be measured is close to the middle position, opening an electromagnetic ball valve five 6.19, accurately measuring the flow by using a small-range gear flowmeter 6.21, then closing an electromagnetic ball valve four 6.18, opening an electromagnetic ball valve three 6.17, and measuring the flow from a port P to a port A (working oil port) of the slide valve assembly and the displacement of a valve core; thirdly, closing the first electromagnetic ball valve 6.11 and the third electromagnetic ball valve 6.17, opening the second electromagnetic ball valve 6.12 and the fourth electromagnetic ball valve 6.18, controlling the harmonic speed reducing motor 2.1 to reversely rotate, and measuring the flow from the T port to the B port (oil return port) of the slide valve assembly and the displacement of the valve core; closing the fourth 6.18 of the electromagnetic ball valve, opening the third 6.17 of the electromagnetic ball valve, and measuring the flow from the T port to the A port of the slide valve assembly and the displacement of the valve core; drawing a flow-displacement characteristic curve in an industrial personal computer according to the measured flow of each port of the slide valve assembly to be measured and the valve core displacement data; sixthly, controlling a harmonic speed reducing motor 2.1 to enable a driving block 2.4 to be separated from contact with a first push rod 4.1, rotating an adjusting nut 4.8 to be separated from contact with a displacement sensor 5, detaching a first end cover 4.2 and a second end cover 4.5, and taking out a slide valve pair 4.4 to be measured; processing and calculating the flow-displacement characteristic curve by using an industrial personal computer to obtain the superposition amount of a slide valve pair of the servo proportional valve; the conventional technique for obtaining the overlap amount of the slide valve pair according to the flow-displacement characteristic curve roughly comprises the following steps: extending a fitting correlation line of the flow and the displacement of each port of the slide valve assembly to be measured in the measured flow-displacement characteristic curve to an X axis with zero flow (the fitting correlation line of the flow and the displacement is a straight line obtained through linear regression), and obtaining a zero flow position before error compensation; calculating the flow error of the valve core when the valve core is opened small, then carrying out error compensation on the zero flow position of each port, and calculating to obtain the zero flow position after error compensation; and finally, calculating the distance between the zero flow position after error compensation of each port and the middle position of the valve core to obtain the superposed quantity of each port of the valve core.
In addition, the first pressure sensor 6.13, the second pressure sensor 6.14, the third pressure sensor 6.15 and the fourth pressure sensor 6.16 are used for detecting the pressure difference of each valve port of the slide valve assembly, and the pressure difference of each valve port of the slide valve assembly is ensured to be kept unchanged through the feedback adjustment of the proportional overflow valve 6.10, so that the pressure loss caused by other elements is prevented from influencing the pressure difference of each valve port of the slide valve assembly, and further the detection accuracy of the flow-displacement relation is influenced.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. The utility model provides a servo proportional valve coincide volume measuring device that surges, includes testboard base, case drive assembly, displacement sensor, data acquisition card and industrial computer, its characterized in that: the hydraulic measurement oil circuit system is characterized by also comprising a transition block, a first push rod, a first end cover, a second end cover, a spring, a second push rod, an adjusting nut and a hydraulic measurement oil circuit system; the transition block and the displacement sensor are fixed on the base of the test bench; the signal output end of the displacement sensor is connected with the signal input end of the acquisition card, and the industrial personal computer is connected with the signal output end of the data acquisition card; the transition block is positioned by a shoulder which is perpendicular to the axis of the displacement sensor and arranged on the base of the test bench, and the top surface of the transition block is provided with the shoulder which is perpendicular to the axis of the displacement sensor; the first push rod is sleeved in the mounting hole of the first end cover; a spring is sleeved on the second push rod, and the second push rod is sleeved in the mounting hole of the second end cover; sealing rings are arranged in the mounting holes of the first end cover and the second end cover; the push rod I and the push rod II are provided with integrally formed shoulders; the adjusting nut is connected with the push rod two-way through a thread pair; the valve core driving assembly comprises a harmonic speed reducing motor, a coupler, a ball screw and a driving block; the harmonic speed reducing motor is controlled by an industrial personal computer, and the signal output end of the harmonic speed reducing motor is connected with a data acquisition card; the base body of the harmonic speed reducing motor is fixed with the base of the test bench, and the output shaft of the harmonic speed reducing motor is connected with the screw of the ball screw through an elastic coupling; a nut of the ball screw is fixed with the driving block; the driving block and a guide rod fixed on the base of the test bench form a sliding pair;
the top surface of the base of the test bench is provided with two P-port channels, two A-port channels, two B-port channels and two T-port channels; the transition block has two specifications, the top surface and the bottom surface of the transition block with one specification are respectively provided with a P port channel, an A port channel, a B port channel and a T port channel, and the side surface is provided with four pressure test holes; the top surface and the bottom surface of the transition block in the other specification are respectively provided with a P port channel, an A port channel, a B port channel and a T port channel, the side surface of the transition block is provided with four pressure test holes, and the number of the T port channels on the top surface is two; the top ends of the P port channel and the A port channel box B port channel on the bottom surface of the transition block are respectively connected with the bottom ends of the P port channel, the A port channel and the B port channel on the top surface; when only one T-port channel is arranged on the top surface of the transition block, the bottom end of the T-port channel is communicated with the top ends of the two T-port channels on the bottom surface of the transition block; when the top surface of the transition block is provided with two T-port channels, the bottom ends of the two T-port channels are respectively communicated with the top ends of the two T-port channels on the bottom surface of the transition block; the layout of the P port channel, the A port channel, the B port channel and the T port channel on the bottom surface of the transition block is completely consistent with that of the P port channel, the A port channel, the B port channel and the T port channel on the base of the test board; sealing rings are arranged at the top ends of the P port channel, the A port channel, the B port channel and the T port channel on the top surface of the transition block and the top ends of the P port channel, the A port channel, the B port channel and the T port channel on the base of the test bench; the outer end of the pressure test hole is provided with a sealing ring; the inner ends of the four pressure test holes are respectively communicated with a port P channel, a port A channel, a port B channel and one port T channel on the bottom surface of the transition block;
the hydraulic measurement oil path system comprises an oil tank, a filter, a safety valve, a constant delivery pump, a one-way valve, an energy accumulator, a stop valve, a proportional overflow valve, a first electromagnetic ball valve, a second electromagnetic ball valve, a third electromagnetic ball valve, a fourth electromagnetic ball valve, a fifth electromagnetic ball valve, a sixth electromagnetic ball valve, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a small-range gear flowmeter and a large-range gear flowmeter; the signal output ends of the pressure sensor I, the pressure sensor II, the pressure sensor III, the pressure sensor IV, the small-range gear flowmeter and the large-range gear flowmeter are all connected with a data acquisition card, and the oil cooler, the proportional overflow valve, the electromagnetic ball valve I, the electromagnetic ball valve II, the electromagnetic ball valve III, the electromagnetic ball valve IV, the electromagnetic ball valve V and the electromagnetic ball valve VI are all controlled by an industrial personal computer; the inlet of the constant delivery pump is connected with the outlet of the oil tank through a filter, and the constant delivery pump is driven by a motor; the outlet of the fixed displacement pump is connected with the inlet of the one-way valve, and the outlet of the one-way valve is connected with the inlet of the safety valve, the inlet of the stop valve and the oil through port of the energy accumulator; the outlet of the safety valve is connected with the inlet of the oil tank; the outlet of the stop valve is connected with the inlet of the proportional overflow valve, the inlet of the first electromagnetic ball valve and the inlet of the second electromagnetic ball valve after being connected with the two filters in series; the outlet of the proportional overflow valve is connected with the inlet of the oil tank; a first pressure sensor is arranged at an outlet of the first electromagnetic ball valve, and a second pressure sensor is arranged at an outlet of the second electromagnetic ball valve; a third pressure sensor is arranged at the inlet of the third electromagnetic ball valve, and a fourth pressure sensor is arranged at the inlet of the fourth electromagnetic ball valve; an outlet of the electromagnetic ball valve III is connected with an inlet of the electromagnetic ball valve V, an outlet of the electromagnetic ball valve IV is connected with an inlet of the electromagnetic ball valve VI, and an outlet of the electromagnetic ball valve III is connected with an outlet of the electromagnetic ball valve IV; an outlet of the electromagnetic ball valve V is connected with an inlet of the oil tank through a small-range gear flowmeter; and an outlet of the electromagnetic ball valve six is connected with an inlet of the oil tank through a wide-range gear flowmeter.
2. The servo proportional valve overlap amount hydraulic measuring device according to claim 1, wherein: the driving block is provided with an integrally formed force application rod.
3. The servo proportional valve overlap amount hydraulic measuring device according to claim 1, wherein: the inlet of the constant delivery pump is provided with a temperature sensor, and the signal output end of the temperature sensor is connected with a data acquisition card.
4. The servo proportional valve overlap amount hydraulic measuring device according to claim 1, wherein: and a liquid level meter is arranged at an inlet of the oil tank.
5. The servo proportional valve overlap amount hydraulic measuring device according to claim 1, wherein: and the inlet of the oil tank is connected with the outlet of the oil tank through an oil cooler.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114412878A (en) * | 2022-01-25 | 2022-04-29 | 哈尔滨工业大学 | Hydraulic grinding table |
| CN114412878B (en) * | 2022-01-25 | 2023-03-10 | 哈尔滨工业大学 | Hydraulic match grinding table |
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