CN108386418B - Pilot-operated overflow valve main valve core displacement detection device - Google Patents
Pilot-operated overflow valve main valve core displacement detection device Download PDFInfo
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- CN108386418B CN108386418B CN201810315718.8A CN201810315718A CN108386418B CN 108386418 B CN108386418 B CN 108386418B CN 201810315718 A CN201810315718 A CN 201810315718A CN 108386418 B CN108386418 B CN 108386418B
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 58
- 239000000523 sample Substances 0.000 claims abstract description 41
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 238000009434 installation Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000003745 diagnosis Methods 0.000 description 5
- 238000013016 damping Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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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
- F15B19/005—Fault detection or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/0041—Electrical or magnetic means for measuring valve parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
The invention discloses a pilot overflow valve main valve core displacement detection device, which comprises a pilot valve and a main valve. The main valve cavity is opened at the upper and lower ends and the left and right ends, the two ends of the main valve spring are respectively propped in the middle hole and the stepped hole of the pilot valve, and the main valve core and the main valve seat are sequentially arranged in the main valve cavity. The two ends of the pilot valve cavity are opened, and the nut and the plug are respectively connected to different ends; one end of the pressure regulating screw is connected with the nut in a threaded manner, the other end of the pressure regulating screw is connected with the regulating hand wheel, the stop block, the regulating rod, the pilot valve core and the pilot valve seat are sequentially arranged in the pilot valve body, a cylindrical through hole is formed in the center of the stop block, the regulating rod penetrates through the cylindrical through hole, and the pressure regulating spring is sleeved on the circumferences of the regulating rod and the pilot valve core; the electric vortex sensor is cross-shaped and comprises a measuring coil, a sealing pressing plate and a probe, one end of the sensor is connected with the pilot valve through a threaded hole, the measuring end of the probe extends into the main valve cavity, the sensor is provided with a hollow cavity, the top end of the sensor is provided with the coil, and a measuring signal is output through an extension cable. The invention has simple structure and reliable and stable work.
Description
Technical Field
The invention belongs to the technical field of online detection in hydraulic valve fault detection and diagnosis, and particularly relates to a pilot overflow valve main valve core displacement detection device.
Background
The pilot overflow valve is used as an important control element of a hydraulic system and plays an important role in systems such as large machinery, aerospace, weapon equipment and the like. The failure of the hydraulic valve is a main cause of the failure of the hydraulic system, and the failure of the hydraulic valve occurs in the relief valve, so that the failure detection and diagnosis of the relief valve plays an important role in the stable and reliable operation of the hydraulic system. At present, fault diagnosis of the overflow valve is mainly judged by adopting artificial experience according to fault phenomenon and off-line measurement parameters. The detection is long in time consumption, the diagnosis process is complex, the result is not accurate and reliable enough, and the high-efficiency and reliable operation of the hydraulic system is affected.
Disclosure of Invention
The invention aims to overcome the defects, and provides a pilot overflow valve main valve core displacement detection device which can intuitively detect the displacement and vibration signals of a main valve core of an overflow valve in real time and has the advantages of simplicity, easiness, convenience in assembly and disassembly, reliability in operation and the like.
The invention is realized by adopting the following technical scheme:
a displacement detection device of a main valve core of a pilot overflow valve comprises a main valve and a pilot valve arranged on the main valve; wherein,,
the main valve comprises a main valve spring, a main valve core, a main valve seat and a main valve body; the main valve body is provided with a hollow cavity with openings at the upper end, the lower end, the left end and the right end, the main valve spring, the main valve core and the main valve seat are sequentially arranged in the hollow cavity of the main valve body from top to bottom, the main valve core is provided with a middle hole, the main valve spring is arranged in the middle hole, one end of the main valve spring is propped in the middle hole, and the other end of the main valve spring extends out of the middle hole and is propped in a stepped hole at the lower end of the pilot valve; the main valve seat is fixedly connected with the main valve body, and an oil outlet is formed in the main valve seat; the main valve core is propped against the main valve seat by utilizing the spring force of the main valve spring and the dead weight of the main valve core, the oil outlet is blocked, and the main valve is in a closed state; when the oil pressure of the oil inlet is larger than the sum of the spring force of the main valve spring, the dead weight of the main valve core and the oil pressure of the upper cavity of the main valve, the main valve core is separated from the main valve seat, the oil outlet is opened, and the main valve is in an opened state;
the pilot valve comprises a pressure regulating screw, a nut, a stop block, an adjusting rod, a pressure regulating spring, a pilot valve core, a pilot valve seat, a pilot valve body and an eddy current sensor; the pilot valve body is internally provided with a hollow cavity with two open ends, and the nut and the plug are respectively connected with the two ends of the pilot valve body through threads; one end of the pressure regulating screw is connected with the nut through threads, the stop block, the regulating rod, the pilot valve core and the pilot valve seat are sequentially arranged in the hollow cavity of the pilot valve body from the nut connecting end, a cylindrical through hole is formed in the center of the stop block, the regulating rod penetrates through the cylindrical through hole, one end of the regulating rod is contacted with one end of the pressure regulating screw, and the other end of the regulating rod is contacted with one end of the pressure regulating spring sleeved on the circumferential direction of the regulating rod and the pilot valve core;
the pilot valve seat is fixedly connected with the pilot valve body, and a fixed orifice is formed in the pilot valve seat; the pressure regulating spring presses the pilot valve core on the pilot valve seat by utilizing spring force, the fixed throttle hole is blocked, the pilot valve is in a closed state, when the system pressure exceeds the pretightening force of the pressure regulating spring, the pilot valve core is separated from the pilot valve seat, the fixed throttle hole is opened, and the pilot valve is in an open state;
the utility model provides a have the screw hole is opened to the pilot valve lower extreme, and current vortex sensor is cross structure, including probe and measuring coil, current vortex sensor one end passes through threaded connection at threaded hole, and the probe measuring end extends to the main valve intracavity portion, and the probe has the cavity, and measuring coil is installed on the cavity top of probe, and measuring signal exports to the pilot valve outside through extension cable.
A further development of the invention is that the main valve and the pilot valve are connected by means of a bolt.
The pilot valve further comprises an adjusting hand wheel, and the other end of the pressure adjusting screw is connected with the adjusting hand wheel.
The pilot valve is further improved in that the pilot valve further comprises a lock nut, the lock nut is in threaded connection with the pressure regulating screw, and the lock nut is matched with the nut to limit the axial movement of the pressure regulating screw.
The invention is further improved in that a hollow cavity for leading out the extension cable is arranged in the pilot valve body.
The invention is further improved in that a section of arc groove is formed at the opening of the upper end of the main valve body and is used for being matched with the installation of the eddy current sensor.
The invention further improves that the electric vortex sensor is fixed with the pilot valve body through threaded connection.
The invention is further improved in that the eddy current sensor further comprises a sealing pressing plate arranged on the circumferential direction of the probe, a sealing groove is formed in the circumferential direction of a threaded hole at the lower end of the pilot valve body, a sealing ring is arranged in the sealing groove, and the sealing pressing plate of the eddy current sensor is in compression fit with the sealing ring to realize sealing.
The invention further improves that the eddy current sensor also comprises a probe framework arranged in the hollow cavity of the probe, the measuring coil is sleeved on the probe framework, and the outer side of the measuring coil is also provided with a coil protection shell connected with the threaded shell of the probe.
The invention has the following beneficial technical effects:
the invention provides a displacement detection device for a main valve core of a pilot overflow valve, which adopts an eddy current sensor to realize the measurement of the vibration displacement of the main valve core of the overflow valve. One end of the electric vortex sensor is connected with the pilot valve through threads by utilizing a threaded hole, the threaded seal is realized, the measuring end of the probe extends out of the main valve cavity, and the sensor probe has the characteristic of high temperature resistance and high pressure resistance. The working displacement range of the main valve core is in the linear range of the eddy current sensor, and the dynamic response frequency of the sensor is higher than the vibration frequency of the main valve core during fault.
Further, the sensor circumference is equipped with sealed clamp plate, compresses tightly the screw hole circumference on the sealing washer during installation, guarantees that overflow valve during operation fluid can not take place to leak.
In summary, the invention is modified on the original overflow valve structure, the installation of the eddy current sensor in the overflow valve is realized by using the threaded connection, the installation of the sensor is simple and easy, the disassembly and the assembly are convenient, the original structure of the pilot valve is not influenced by the modified structure, and the real-time detection of the vibration displacement of the main valve core of the overflow valve can be realized. The detection of the working state of the overflow valve can be realized by utilizing the real-time detection data of the sensor, and whether the main valve core has faults such as clamping stagnation, vibration and the like is judged, thereby belonging to an online detection technology in the detection and diagnosis of the hydraulic valve faults.
Drawings
FIG. 1 is a right side cross-sectional view of a pilot relief valve main spool displacement detection device of the present invention.
FIG. 2 is a front cross-sectional view of a pilot relief valve main spool displacement sensing device of the present invention.
Fig. 3 is an isometric view of the main valve body.
Fig. 4 is a cross-sectional view of the main valve body.
Fig. 5 is an isometric view of a pilot valve.
FIG. 6 is a cross-sectional view of a pilot valve.
Fig. 7 is an isometric view of an eddy current sensor.
Fig. 8 is a cross-sectional view of an eddy current sensor.
Fig. 9 is an isometric view of an eddy current sensor installation.
Fig. 10 is a cross-sectional view of an eddy current sensor installation.
Fig. 11 is a schematic diagram of the eddy current testing operation.
Fig. 12 is an eddy current testing equivalent circuit diagram.
Fig. 13 is a graph of an eddy current sensor detection performance analysis.
In the figure: 1-a main valve spring, 2-a main valve core, 3-a main valve seat, 4-a main valve body and 5-an adjusting hand wheel; the device comprises a 6-locking nut, a 7-pressure regulating screw, an 8-nut, a 9-stop block, a 10-regulating rod, a 11-pressure regulating spring, a 12-pilot valve core, a 13-pilot valve seat, a 14-pilot valve body, a 15-eddy current sensor, a 16-plug, a 17-sealing pressing plate, an 18-probe, a 19-extension cable, a 20-sealing ring, a 21-coil protecting shell, a 22-probe framework and a 23-measuring coil.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 8, the present invention provides a pilot overflow valve main valve core displacement detection device, which includes a main valve and a pilot valve mounted on the main valve.
The main valve comprises a main valve spring 1, a main valve core 2, a main valve seat 3 and a main valve body 4; the main valve body 4 is provided with a hollow cavity with openings at the upper end, the lower end, the left end and the right end, the main valve spring 1, the main valve core 2 and the main valve seat 3 are sequentially arranged in the hollow cavity of the main valve body 4 from top to bottom, the main valve core 2 is provided with a middle hole, the main valve spring 1 is arranged in the middle hole, one end of the main valve spring 1 is propped in the middle hole, and the other end of the main valve spring extends out of the middle hole and is propped in the stepped hole at the lower end of the pilot valve; the main valve seat 3 is fixedly connected with the main valve body 4, and the main valve seat 3 is provided with an oil outlet; the main valve core 2 is propped against the main valve seat 3 by utilizing the spring force of the main valve spring 1 and the dead weight of the main valve core 2, the oil outlet is blocked, and the main valve is in a closed state; when the oil pressure of the oil inlet is larger than the sum of the spring force of the main valve spring 1, the dead weight of the main valve core 2 and the oil pressure of the upper cavity of the main valve, the main valve core 2 is separated from the main valve seat 3, the oil outlet is opened, and the main valve is in an opened state.
The pilot valve comprises an adjusting hand wheel 5, a pressure adjusting screw 7, a nut 8, a stop 9, an adjusting rod 10, a pressure adjusting spring 11, a pilot valve core 12, a pilot valve seat 13, a pilot valve body 14 and an eddy current sensor 15; the pilot valve body 14 is internally provided with a hollow cavity with two open ends, and the nut 8 and the plug 16 are respectively connected with the two ends of the pilot valve body 14 through threads; one end of the pressure regulating screw 7 is connected with the nut 8 through threads, the stop block 9, the regulating rod 10, the pilot valve core 12 and the pilot valve seat 13 are sequentially arranged in the hollow cavity of the pilot valve body 14 from the connecting end of the nut 8, a cylindrical through hole is formed in the center of the stop block 9, the regulating rod 10 penetrates through the cylindrical through hole, one end of the regulating rod 10 is contacted with one end of the pressure regulating screw 7, and the other end of the regulating rod 10 is contacted with one end of the pressure regulating spring 11 sleeved on the circumference of the regulating rod 10 and the pilot valve core 12.
The pilot valve seat 13 is fixedly connected with the pilot valve body 14, and a fixed orifice is formed in the pilot valve seat 13; the pressure regulating spring 11 presses the pilot valve core 12 on the pilot valve seat 13 by utilizing spring force, the fixed throttle is blocked, the pilot valve is in a closed state, when the system pressure exceeds the pretightening force of the pressure regulating spring 11, the pilot valve core 12 is separated from the pilot valve seat 13, the fixed throttle is opened, and the pilot valve is in an open state; the lower extreme of pilot valve is opened there is the screw hole, and electric vortex sensor 15 is cross structure, including probe 18 and measuring coil 23, and electric vortex sensor 15 one end passes through threaded connection at threaded hole, and probe 18 measuring end extends to the main valve intracavity portion, and probe 18 has the cavity, and measuring coil 23 is installed on the cavity top of probe 18, and measuring signal exports outside the pilot valve body 14 through extension cable 19.
The pilot valve further comprises a lock nut 6, the lock nut 6 being in threaded connection with the pressure regulating screw 7 for limiting the axial movement of the pressure regulating screw 7 by cooperating with a nut 8. The electric vortex sensor 15 further comprises a sealing pressing plate 17 arranged on the circumferential direction of the probe 18, a sealing groove is formed in the circumferential direction of a threaded hole at the lower end of the pilot valve body 14, a sealing ring 20 is arranged in the sealing groove, and the sealing pressing plate 17 of the electric vortex sensor 15 is in compression fit with the sealing ring 20 to realize sealing. The eddy current sensor 15 further comprises a probe skeleton 22 arranged in the hollow cavity of the probe 18, a measuring coil 23 is sleeved on the probe skeleton 22, and a coil protection shell 21 connected with the threaded shell of the probe 18 is further arranged on the outer side of the measuring coil 23.
In fig. 2, the opening pressure of the overflow valve pilot valve is determined by a pressure adjusting device, and the pressure adjusting device of the pilot valve comprises an adjusting hand wheel 5, a pressure adjusting screw 7, a nut 8, a stop block 9, an adjusting rod 10 and a pressure adjusting spring 11. The adjusting hand wheel 5 is fixedly connected with the pressure adjusting screw 7, and the pressure adjusting screw 7 is connected with the nut 8 through threads. When the opening pressure is regulated, the regulating hand wheel 5 is rotated to drive the pressure regulating screw 7 and the regulating rod 10 to screw in or retreat, so that the precompression amount of the pressure regulating spring 11 is regulated to change the opening pressure of the valve core of the pilot valve. The pilot valve seat 13 is fixedly connected with the pilot valve body 14, and a fixed orifice is formed in the pilot valve seat 13. The pressure regulating spring 11 pushes the pilot valve core 12 against the pilot valve seat 13 by utilizing spring force, the fixed orifice is blocked, and the pilot valve is in a closed state. When the system pressure exceeds the spring pretightening force of the pressure regulating spring 11, the pilot valve core 12 is separated from the pilot valve seat 13, the fixed orifice is opened, and the pilot valve is in an opened state.
The main valve core 2 is provided with a damping hole, the lower end of the pilot valve is provided with a stepped hole, and the stepped hole is connected with the oil outlet of the main valve through the middle hole of the main valve core 2. When the system pressure exceeds the pretightening force of the pressure regulating spring 11, the pilot valve is opened, and oil flows out from the oil outlet through the oil inlet, the damping hole of the main valve core 2, the fixed orifice of the pilot valve seat 13, the pilot valve cavity, the stepped hole and the middle hole of the main valve core 2. The oil flows through the damping hole of the main valve core 2 from the lower cavity of the main valve to the upper cavity, the oil pressure of the upper cavity of the main valve is reduced due to the action of the damping hole, when the pressure difference between the upper cavity and the lower cavity of the main valve exceeds the sum of the pretightening force of the main valve spring 1 and the self weight of the main valve core 2, the main valve core 2 is separated from the main valve seat 3, and the main valve is in an open state.
The eddy current sensor 15 is in a cross structure and consists of a sealing pressing plate 17 and a probe 18, wherein the sealing pressing plate 17 is used for limiting and sealing, and the probe 18 is used for displacement measurement. The electric vortex sensor 15 is in threaded fixed connection and threaded sealing with the pilot valve body 14 through a threaded hole. The probe 18 consists of two sections of cylinders with the diameter of 6mm, the length of 20mm and the diameter of 5.5mm and the length of 5 mm; the sealing pressing plate is a circular ring with an outer diameter of 15.6mm, an inner diameter of 6mm and a thickness of 2.78 mm. The screw hole depth at the lower end of the pilot valve body 14 is 13.12mm, the external screw diameter of the probe 18 is 6mm, and the screw connection depth with the pilot valve body 14 is 12.54mm.
The eddy current sensor 15 is composed of a sealing pressing plate 17 and a probe 18, wherein the sealing pressing plate 17 is used for limiting and sealing, and the probe 18 is used for displacement measurement. The probe 18 is internally provided with a hollow cavity, the top end of the cavity is provided with a measuring coil 23, the measuring coil 23 is wound on the probe framework 22, and the rear end opening is connected with the hollow cavity arranged on the pilot valve body 14 and used for leading out the extension cable 19. The housing of the eddy current sensor 15 is divided into a front section and a rear section, the front section housing is a coil protection housing 21, the rear section housing is a threaded housing provided with threads with the length of 12.54mm, and the two sections of housings are integrated with the sealing pressing plate 17.
In order to meet the overall sealing effect of the overflow valve, a sealing groove is formed in the threaded hole, and a sealing ring is arranged in the sealing groove. Meanwhile, the threaded connection of the electric vortex sensor 15 and the pilot valve body 14 achieves threaded sealing, and the integral sealing effect of the overflow valve is enhanced.
By applying a high frequency sinusoidal excitation signal voltage U to the sensor measurement coil 23 according to Faraday's law of electromagnetic induction, the measurement coil 23 will generate a sinusoidal alternating magnetic field which causes an eddy current i to be generated at the surface of the metal conductor in the sinusoidal alternating magnetic field 2 As shown in fig. 11. Electric vortex i 2 And then generate an alternating magnetic field H 2 In the direction of a sinusoidal alternating magnetic field H 1 In contrast, and hinder the sinusoidal alternating magnetic field H 1 The impedance of the measuring coil 23 changes accordingly. The degree of change in the impedance of the measuring coil 23 depends on parameters such as the material of the spool, the size of the coil, the excitation frequency of the coil, the distance between the coil and the spool, etc. The other parameters are kept unchanged, the impedance of the measuring coil 23 becomes a single-value function of the distance between the coil and the valve core only by changing the distance between the coil and the valve core, and the one-to-one correspondence relation is kept.
For the convenience of analysis, the measured valve core is abstracted into a short-circuit coil, and an equivalent circuit of the eddy current sensor is shown in fig. 12. R is R 1 、L 1 Is the resistance and inductance of the sensor measuring coil, R 2 、L 2 The valve core is the resistance and inductance of the valve core, M is the mutual inductance coefficient between the sensor measuring coil and the valve core, the input excitation voltage of the sensor measuring coil is U, and according to the kirchhoff voltage balance equation, the balance equation of the equivalent circuit is as follows:
thereby obtaining the equivalent resistance and the equivalent inductance of the sensor measuring coil as follows:
in fig. 13, the linear range of the eddy current sensor is 2.0mm, the linear starting point is 0.4mm, the measured main valve core moves 0.1mm each time in the linear range of the eddy current sensor, the voltage output values of the sensor under different detection distances are recorded, and the output voltage values are subjected to linear fitting. After linear fitting, the decision coefficient of the fitted curve was 0.999413 and the slope was 4.6305. The sensor has higher sensitivity and high output linearity, and can meet the measurement of the displacement signal of the main valve core of the overflow valve.
Claims (9)
1. The displacement detection device of the main valve core of the pilot overflow valve is characterized by comprising a main valve and a pilot valve arranged on the main valve; wherein,,
the main valve comprises a main valve spring (1), a main valve core (2), a main valve seat (3) and a main valve body (4); the main valve body (4) is provided with a hollow cavity with openings at the upper end, the lower end, the left end and the right end, the main valve spring (1), the main valve core (2) and the main valve seat (3) are sequentially arranged in the hollow cavity of the main valve body (4) from top to bottom, the main valve core (2) is provided with a middle hole, the main valve spring (1) is arranged in the middle hole, one end of the main valve spring (1) is propped in the middle hole, and the other end of the main valve spring extends out of the middle hole and is propped in a stepped hole at the lower end of the pilot valve; the main valve seat (3) is fixedly connected with the main valve body (4), and the main valve seat (3) is provided with an oil outlet; the main valve core (2) is propped against the main valve seat (3) by utilizing the spring force of the main valve spring (1) and the dead weight of the main valve core (2), the oil outlet is blocked, and the main valve is in a closed state; when the oil pressure of the oil inlet is larger than the sum of the spring force of the main valve spring (1), the dead weight of the main valve core (2) and the oil pressure of the upper cavity of the main valve, the main valve core (2) is separated from the main valve seat (3), the oil outlet is opened, and the main valve is in an opened state;
the pilot valve comprises a pressure regulating screw (7), a nut (8), a stop block (9), an adjusting rod (10), a pressure regulating spring (11), a pilot valve core (12), a pilot valve seat (13), a pilot valve body (14) and an eddy current sensor (15); a hollow cavity with two open ends is arranged in the pilot valve body (14), and a nut (8) and a plug (16) are respectively connected with the two ends of the pilot valve body (14) through threads; one end of the pressure regulating screw (7) is connected with the nut (8) through threads, the stop block (9), the regulating rod (10), the pilot valve core (12) and the pilot valve seat (13) are sequentially arranged in a hollow cavity of the pilot valve body (14) from the connecting end of the nut (8), a cylindrical through hole is formed in the center of the stop block (9), the regulating rod (10) penetrates through the cylindrical through hole, one end of the regulating rod is contacted with one end of the pressure regulating screw (7), and the other end of the regulating rod is contacted with one end of the pressure regulating spring (11) sleeved on the circumference of the regulating rod (10) and the pilot valve core (12);
the pilot valve seat (13) is fixedly connected with the pilot valve body (14), and a fixed orifice is formed in the pilot valve seat (13); the pilot valve is characterized in that the pressure regulating spring (11) presses the pilot valve core (12) on the pilot valve seat (13) by utilizing spring force, a fixed orifice is blocked, the pilot valve is in a closed state, when the system pressure exceeds the pretightening force of the pressure regulating spring (11), the pilot valve core (12) is separated from the pilot valve seat (13), the fixed orifice is opened, and the pilot valve is in an open state;
the utility model provides a screw hole is opened to pilot valve lower extreme, and electric vortex sensor (15) are cross structure, including probe (18) and measuring coil (23), electric vortex sensor (15) one end passes through threaded connection at threaded hole, and probe (18) measuring end extends to the main valve intracavity portion, and probe (18) have cavity, and measuring coil (23) is installed on cavity top of probe (18), and measuring signal exports outside pilot valve body (14) through extension cable (19).
2. The pilot-operated relief valve spool displacement detection device of claim 1, wherein the main valve and the pilot valve are bolted.
3. The pilot overflow valve main valve core displacement detection device according to claim 1, wherein the pilot valve further comprises an adjusting hand wheel (5), and the other end of the pressure adjusting screw (7) is connected with the adjusting hand wheel (5).
4. A pilot operated relief valve main spool displacement sensing device according to claim 1, characterized in that the pilot valve further comprises a lock nut (6), the lock nut (6) being in threaded connection with the pressure regulating screw (7) for limiting axial displacement of the pressure regulating screw (7) by cooperating with the nut (8).
5. The pilot-operated relief valve main spool displacement detection device of claim 1, wherein a hollow cavity from which an extension cable (19) is led out is opened in the pilot valve body (14).
6. The displacement detection device for the main valve core of the pilot overflow valve according to claim 1, wherein a section of arc groove is formed at the opening of the upper end of the main valve body (4) and is used for being matched with the installation of the eddy current sensor (15).
7. The pilot-operated relief valve main spool displacement detection device according to claim 1, characterized in that the eddy current sensor (15) is fixed to the pilot valve body (14) by means of a threaded connection.
8. The pilot overflow valve main valve core displacement detection device according to claim 1, characterized in that the electric vortex sensor (15) further comprises a sealing pressing plate (17) arranged on the circumferential direction of the probe (18), a sealing groove is formed in the circumferential direction of a threaded hole at the lower end of the pilot valve body (14), a sealing ring (20) is arranged in the sealing groove, and the sealing pressing plate (17) of the electric vortex sensor (15) is in press fit with the sealing ring (20) to realize sealing.
9. The pilot overflow valve main valve core displacement detection device according to claim 1, characterized in that the eddy current sensor (15) further comprises a probe framework (22) arranged in the hollow cavity of the probe (18), the measuring coil (23) is sleeved on the probe framework (22), and a coil protection shell (21) connected with the threaded shell of the probe (18) is further arranged on the outer side of the measuring coil (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810315718.8A CN108386418B (en) | 2018-04-10 | 2018-04-10 | Pilot-operated overflow valve main valve core displacement detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810315718.8A CN108386418B (en) | 2018-04-10 | 2018-04-10 | Pilot-operated overflow valve main valve core displacement detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108386418A CN108386418A (en) | 2018-08-10 |
| CN108386418B true CN108386418B (en) | 2023-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810315718.8A Active CN108386418B (en) | 2018-04-10 | 2018-04-10 | Pilot-operated overflow valve main valve core displacement detection device |
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| CN112855641B (en) * | 2019-11-12 | 2023-01-03 | 上海朝田实业股份有限公司 | Automatic hydraulic valve |
| CN113864264A (en) * | 2021-09-07 | 2021-12-31 | 刘颖 | Pilot-operated overflow valve |
| CN117967565B (en) * | 2024-03-28 | 2024-06-07 | 新乡市振航机电有限公司 | Composite pilot valve of emulsion pump and application method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001200951A (en) * | 2000-01-13 | 2001-07-27 | Techno Excel Co Ltd | Pilot valve type solenoid feed valve |
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| CN201144914Y (en) * | 2007-12-29 | 2008-11-05 | 上海立新液压有限公司 | Pilot type pressure reducing valve |
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| CN102155470A (en) * | 2011-05-27 | 2011-08-17 | 常德中联重科液压有限公司 | Automatic detection and debugging system and method of hydraulic valve |
| CN103382952A (en) * | 2012-05-04 | 2013-11-06 | 罗伯特·博世有限公司 | Hydraulic control system with load pressure reduction device and hydraulic valve set therefor |
-
2018
- 2018-04-10 CN CN201810315718.8A patent/CN108386418B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001200951A (en) * | 2000-01-13 | 2001-07-27 | Techno Excel Co Ltd | Pilot valve type solenoid feed valve |
| JP2008115978A (en) * | 2006-11-07 | 2008-05-22 | Yoshitake Inc | Pilot type solenoid valve |
| CN201144914Y (en) * | 2007-12-29 | 2008-11-05 | 上海立新液压有限公司 | Pilot type pressure reducing valve |
| DE102008064359A1 (en) * | 2008-12-22 | 2010-07-01 | Abb Technology Ag | Method for the position-dependent determination of electronic wear status of a valve mechanism and pneumatic valve |
| CN102155470A (en) * | 2011-05-27 | 2011-08-17 | 常德中联重科液压有限公司 | Automatic detection and debugging system and method of hydraulic valve |
| CN103382952A (en) * | 2012-05-04 | 2013-11-06 | 罗伯特·博世有限公司 | Hydraulic control system with load pressure reduction device and hydraulic valve set therefor |
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| Publication number | Publication date |
|---|---|
| CN108386418A (en) | 2018-08-10 |
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