CN105805087A - Multistage-pressure automatic switching detection device - Google Patents
Multistage-pressure automatic switching detection device Download PDFInfo
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- CN105805087A CN105805087A CN201610300650.7A CN201610300650A CN105805087A CN 105805087 A CN105805087 A CN 105805087A CN 201610300650 A CN201610300650 A CN 201610300650A CN 105805087 A CN105805087 A CN 105805087A
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- pressure
- operated directional
- oil
- directional control
- control valve
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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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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A multistage-pressure automatic switching detection device comprises a low-pressure hydraulic operated directional valve and a medium-pressure hydraulic operated directional valve which are connected in parallel; an oil outlet of the low-pressure hydraulic operated directional valve is connected with a low-pressure pressure sensor, and an oil inlet of the low-pressure hydraulic operated directional valve is connected with a pressure oil opening; an oil returning opening of the low-pressure hydraulic operated directional valve is connected with an oil draining opening; an oil outlet of the medium-pressure hydraulic operated directional valve is connected with a medium-pressure pressure sensor, and an oil inlet of the medium-pressure hydraulic operated directional valve is connected with the pressure oil opening; an oil returning opening of the medium-pressure hydraulic operated directional valve is connected with the oil draining opening; and a high-pressure sensor is connected with the pressure oil opening, the pressure oil opening is in pipeline connection with a pressure measuring opening, and the oil draining opening is connected with an oil draining pipe. According to the multistage-pressure automatic switching detection device, the corresponding range can be automatically and rapidly switched, the pressure measuring range is wide, and the measuring precision is high.
Description
Technical field
The present invention relates to technical field of pressure detection, be specifically related to a kind of multistage pressure automatic switchover detecting device.
Background technology
Pressure transducer, pressure transmitter or Pressure gauge are one of pressure detecting elements the most frequently used in fluid system, can obtain the pressure signal of fluid system in real time by it.When the hydraulic servo control system of the new clothes equipment such as multiple tube test tube machine, material seven-roll Abramsen machine is carried out pressure detecting, owing to the operating pressure of these hydraulic systems changes with the difference of load, pressure range very wide (pressure of many systems varies more than more than three times, even higher) and pressure detecting required precision are higher.For pressure transducer, the precision of industrial high-precision pressure sensor is gamut certainty of measurement, and monitoring error is multiplied by its precision equal to the range of pressure transducer in fact；When adopt wide range pressure transducer measure above-mentioned hydraulic system operating pressure time, system maximum measurement pressure requirements can be met, hydraulic system be in relatively high workload pressure time can reach very high measured value precision；But the measured value precision when hydraulic system is in relatively low operating pressure is excessively poor；And adopt the pressure transducer of small-range can reach required measured value precision when hydraulic system is in relatively low operating pressure (being about the range less than 1/3rd), but hydraulic system is in operating mode during relatively high workload pressure, pressure transducer is most likely in fully loaded or overload condition, and pressure transducer is easily damaged owing to system pressure is too high.For this, it is accomplished by a kind of change with pressure tap pressure, it is possible to be switched to corresponding range automatically and quickly and contain pressure transducer (or pressure transmitter, Pressure gauge) place of this force value pressure tap is carried out the multistage pressure automatic switchover detecting device of pressure detecting.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, it is an object of the invention to provide a kind of multistage pressure automatic switchover detecting device, it is possible to be switched to corresponding range automatically and quickly, pressure measurement range width, certainty of measurement are high.
In order to achieve the above object, the technical scheme that the present invention takes is:
A kind of multistage pressure automatic switchover detecting device, including low pressure pilot operated directional control valve 1 in parallel and middle pressure pilot operated directional control valve 3, the oil-out A of low pressure pilot operated directional control valve 1 is connected with low-pressure sensor 2, the oil inlet P of low pressure pilot operated directional control valve 1 is connected with force feed mouth, and the oil return inlet T of low pressure pilot operated directional control valve 1 is connected with drain tap；The oil-out A of middle pressure pilot operated directional control valve 3 is connected with middle pressure pressure sensor 4, and the oil inlet P of middle pressure pilot operated directional control valve 3 is connected with force feed mouth, and the oil return inlet T of middle pressure pilot operated directional control valve 3 is connected with drain tap；High-pressure pressure sensor 5 is connected with force feed mouth, and force feed mouth is connected with pressure tap pipeline, and drain tap and drain mast connect.
Described low pressure pilot operated directional control valve 1 is identical with the structure of middle pressure pilot operated directional control valve 3, low pressure pilot operated directional control valve 1 includes valve body 13, valve pocket 14 and non-isometrical spool 15, it is provided with sealing 16 at the valve body 13 oil inlet P place of non-isometrical spool 15 one end, it is provided with adjustment screw 11 at valve body 13 other end, regulate screw 11 and be pressed on non-isometrical spool 15 other end through pressure spring 12, valve body 13 oil inlet P and valve body 13 oil-out A are by X place channel connection, and valve body 13 oil-out A and valve body 13 oil return inlet T are by Y place channel connection.
Allowing the set point value place measured to arrange pressure set points lower than low-pressure sensor 2, when the pressure of low pressure pilot operated directional control valve 1 oil-out A reaches this setting value, the force value that low-pressure sensor 2 sends will be no longer participate in observing and controlling；Allowing the set point value place measured to arrange pressure set points lower than middle pressure pressure sensor 4, when the pressure of central pressure pilot operated directional control valve 3 oil-out A reaches this setting value, the force value that middle pressure pressure sensor 4 sends will be no longer participate in observing and controlling.
If the hypertonia that need to prevent pressure tap damages high-pressure pressure sensor 5, between high-pressure pressure sensor 5 and pressure tap, increase a corresponding high pressure hydraulic control reversal valve realize.
According to the certainty of measurement and the range that detect pressure tap pressure in actually detected process, increase or reduce the quantity of different pressures grade pilot operated directional control valve and pressure transducer.
The invention has the beneficial effects as follows:
1, switching the pilot operated directional control valve pressure transducer to corresponding range either directly through pressure tap pressure, controlling unit is few, switch speed is fast, without manual intervention.
2, the pressure measurement range width of whole device, certainty of measurement are high.
3, while realizing continuous detecting pressure tap pressure, the measurement error brought it is prevented effectively from pilot operated directional control valve A mouth closing process by pressure set points.
4, pressure transducer turn on automatically oil return when outranging operating mode, both can prevent pressure transducer pressure overload, and turn avoid pressure transducer and be constantly in high pressure conditions, explicitly indicated that the measured value of this pressure transducer is not involved in observing and controlling simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of multistage pressure automatic switchover detecting device of the present invention.
Fig. 2 is the structural representation of low pressure pilot operated directional control valve 1 of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
With reference to Fig. 1, a kind of multistage pressure automatic switchover detecting device, including low pressure pilot operated directional control valve 1 in parallel and middle pressure pilot operated directional control valve 3, the oil-out A of low pressure pilot operated directional control valve 1 is connected with low-pressure sensor 2, the oil inlet P of low pressure pilot operated directional control valve 1 is connected with force feed mouth, and the oil return inlet T of low pressure pilot operated directional control valve 1 is connected with drain tap；The oil-out A of middle pressure pilot operated directional control valve 3 is connected with middle pressure pressure sensor 4, and the oil inlet P of middle pressure pilot operated directional control valve 3 is connected with force feed mouth, and the oil return inlet T of middle pressure pilot operated directional control valve 3 is connected with drain tap；High-pressure pressure sensor 5 is connected with force feed mouth, and force feed mouth is connected with pressure tap pipeline, and drain tap and drain mast connect.
With reference to Fig. 2, described low pressure pilot operated directional control valve 1 is identical with the structure of middle pressure pilot operated directional control valve 3, low pressure pilot operated directional control valve 1 includes valve body 13, valve pocket 14 and non-isometrical spool 15, it is provided with sealing 16 at the valve body 13 oil inlet P place of non-isometrical spool 15 one end, it is provided with adjustment screw 11 at valve body 13 other end, regulate screw 11 and be pressed on non-isometrical spool 15 other end through pressure spring 12, valve body 13 oil inlet P and valve body 13 oil-out A are by X place channel connection, and valve body 13 oil-out A and valve body 13 oil return inlet T are by Y place channel connection.
Detected pressure value for guaranteeing low-pressure sensor 2 does not have substantially overproof, allowing the set point value place measured that pressure set points is set lower than low-pressure sensor 2, when the pressure of low pressure pilot operated directional control valve 1 oil-out A reaches this setting value, the force value that low-pressure sensor 2 sends will be no longer participate in observing and controlling；Detected pressure value for guaranteeing middle pressure pressure sensor 4 does not have substantially overproof, allowing the set point value place measured that pressure set points is set lower than middle pressure pressure sensor 4, when the pressure of central pressure pilot operated directional control valve 3 oil-out A reaches this setting value, the force value that middle pressure pressure sensor 4 sends will be no longer participate in observing and controlling.
If the hypertonia that need to prevent pressure tap damages high-pressure pressure sensor 5, between high-pressure pressure sensor 5 and pressure tap, increase a corresponding high pressure hydraulic control reversal valve realize.
In actually detected process, according to the certainty of measurement of detection pressure tap pressure and range, increase or reduce the quantity of different pressures grade pilot operated directional control valve and pressure transducer.
The operation principle of pilot operated directional control valve is:
The operation principle of pressure pilot operated directional control valve low, middle is identical, the operation principle of low pressure pilot operated directional control valve is: low pressure pilot operated directional control valve 1 passes through fluid pressure produced power difference and comparison control non-isometrical spool 15 action regulating the pressure spring power that screw 11 produces through pressure spring 12 on non-isometrical spool 15 two ends, with P1Represent the pressure of pressure tap, D1Represent non-isometrical spool 15 big footpath, d1Represent non-isometrical spool 15 path, Ft1And Ft2Represent lower limit and the higher limit of pressure spring set pressure respectively, then as this P1·(D1 2-d1 2)×(π/4)≤Ft1Time, the oil-out A of low pressure pilot operated directional control valve 1 communicates with oil inlet P through X place passage, and now low-pressure sensor 2 can detect the actual value of pressure tap pressure from oil-out A；With putting forth effort being gradually increased of difference, pressure spring 12 compresses, and non-isometrical spool 15 moves and makes the opening of oil-out A be gradually reduced；Work as P1·(D1 2-d1 2) × (π/4) > Ft2Time, the oil-out A of low pressure pilot operated directional control valve 1 closes, and now the pressure of oil-out A is equivalent to the set point value that coupled low-pressure sensor 2 allows to measure, and this value measures the higher limit of scope slightly below low-pressure sensor 2；When power difference is gradually increased further, oil-out A communicates with oil return inlet T through Y place passage, low-pressure sensor 2 off-load.
The operation principle of multistage pressure automatic switchover detecting device of the present invention is:
In course of normal operation, when the pressure of pressure tap is less than the pressure set points of low-pressure sensor 2, the oil-out A of low pressure pilot operated directional control valve 1 and middle pressure pilot operated directional control valve 3 is in opening, and low-pressure sensor 2, middle pressure pressure sensor 4, high-pressure pressure sensor 5 all have the pressure tap force value detected to send；Owing to the precision of each pressure transducer is identical, low-pressure sensor 2 range is minimum, measured value precision is the highest, the pressure measured value that the force value sent with low-pressure sensor 2 is pressure tap.When pressure tap pressure more than the pressure set points of low-pressure sensor 2, less than the pressure set points of middle pressure pressure sensor 4 time, the oil-out A of low pressure pilot operated directional control valve 1 closes and the oil-out A of middle pressure pilot operated directional control valve 3 is still held open, the pressure of low-pressure sensor 2 becomes return pressure with the rising of pressure tap pressure, and middle pressure pressure sensor 4, high-pressure pressure sensor 5 all have detected pressure tap force value to send；Also due to middle pressure pressure sensor 4 range is less, measured value precision is higher, the pressure measured value that the force value sent with middle pressure pressure sensor 4 is pressure tap.When the pressure of pressure tap is more than the pressure set points of middle pressure pressure sensor 4, the oil-out A of middle pressure pilot operated directional control valve 3 is also switched off, now the pressure of low-pressure sensor 2 and middle pressure pressure sensor 4 becomes return pressure with the rising of pressure tap pressure, the pressure measured value that force value is pressure tap that high-pressure pressure sensor 5 sends.
Claims (5)
1. a multistage pressure automatic switchover detecting device, including low pressure pilot operated directional control valve (1) in parallel and middle pressure pilot operated directional control valve (3), it is characterized in that: the oil-out A of low pressure pilot operated directional control valve (1) is connected with low-pressure sensor (2), the oil inlet P of low pressure pilot operated directional control valve (1) is connected with force feed mouth, and the oil return inlet T of low pressure pilot operated directional control valve (1) is connected with drain tap；The oil-out A of middle pressure pilot operated directional control valve (3) is connected with middle pressure pressure sensor (4), the oil inlet P of middle pressure pilot operated directional control valve (3) is connected with force feed mouth, and the oil return inlet T of middle pressure pilot operated directional control valve (3) is connected with drain tap；High-pressure pressure sensor (5) is connected with force feed mouth, and force feed mouth is connected with pressure tap pipeline, and drain tap and drain mast connect.
2. a kind of multistage pressure automatic switchover detecting device according to claim 1, it is characterized in that: described low pressure pilot operated directional control valve (1) is identical with the structure of middle pressure pilot operated directional control valve (3), low pressure pilot operated directional control valve (1) includes valve body (13), valve pocket (14) and non-isometrical spool (15), it is provided with sealing (16) at valve body (13) the oil inlet P place of non-isometrical spool (15) one end, it is provided with adjustment screw (11) at valve body (13) other end, regulate screw (11) and be pressed on non-isometrical spool (15) other end through pressure spring (12), valve body (13) oil inlet P and valve body (13) oil-out A are by X place channel connection, valve body (13) oil-out A and valve body (13) oil return inlet T are by Y place channel connection.
3. a kind of multistage pressure automatic switchover detecting device according to claim 1, it is characterized in that: allowing the set point value place measured that pressure set points is set lower than low-pressure sensor (2), when the pressure of low pressure pilot operated directional control valve (1) oil-out A reaches this setting value, the force value that low-pressure sensor (2) sends will be no longer participate in observing and controlling；Allowing the set point value place measured that pressure set points is set lower than middle pressure pressure sensor (4), when the pressure of central pressure pilot operated directional control valve (3) oil-out A reaches this setting value, the force value that middle pressure pressure sensor (4) sends will be no longer participate in observing and controlling.
4. a kind of multistage pressure automatic switchover detecting device according to claim 1, it is characterized in that: if need to prevent the hypertonia of pressure tap from damaging high-pressure pressure sensor (5), between high-pressure pressure sensor (5) and pressure tap, increase a corresponding high pressure hydraulic control reversal valve realize.
5. a kind of multistage pressure automatic switchover detecting device according to claim 1, it is characterized in that: according to the certainty of measurement and the range that detect pressure tap pressure in actually detected process, increase or reduce the quantity of different pressures grade pilot operated directional control valve and pressure transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610300650.7A CN105805087A (en) | 2016-05-09 | 2016-05-09 | Multistage-pressure automatic switching detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610300650.7A CN105805087A (en) | 2016-05-09 | 2016-05-09 | Multistage-pressure automatic switching detection device |
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| CN105805087A true CN105805087A (en) | 2016-07-27 |
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| CN201610300650.7A Pending CN105805087A (en) | 2016-05-09 | 2016-05-09 | Multistage-pressure automatic switching detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607251A (en) * | 2017-09-08 | 2018-01-19 | 上海工业自动化仪表研究院有限公司 | A kind of differential pressure or pressure transmitter with double-range |
| CN108593188A (en) * | 2018-04-02 | 2018-09-28 | 哈尔滨工业大学 | A kind of pressure capsule system |
| CN108872546A (en) * | 2017-05-08 | 2018-11-23 | 沈阳航达机载设备有限公司 | A kind of quality detection device suitable for high pressure and low pressure oil liquid |
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| JPH0771589A (en) * | 1993-08-31 | 1995-03-17 | Honda Motor Co Ltd | Control device of automatic transmission for vehicle |
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| CN105485080A (en) * | 2014-09-24 | 2016-04-13 | 中联重科股份有限公司 | Rotary motor control system and control method thereof |
| CN205605541U (en) * | 2016-05-09 | 2016-09-28 | 中国重型机械研究院股份公司 | Multistage pressure automatic switch -over detects structure |
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0771589A (en) * | 1993-08-31 | 1995-03-17 | Honda Motor Co Ltd | Control device of automatic transmission for vehicle |
| CN201681320U (en) * | 2010-03-26 | 2010-12-22 | 上海市计量测试技术研究院 | Gas pressure and flow control device of humidity generator |
| CN102889269A (en) * | 2012-09-27 | 2013-01-23 | 三一重工股份有限公司 | Pressure detection system for preloaded oil cylinders, super lift device and crane |
| CN103527541A (en) * | 2013-09-16 | 2014-01-22 | 洛阳中重自动化工程有限责任公司 | Hydraulic control system achieving automatic switchover of stand by pump |
| CN103645302A (en) * | 2013-12-17 | 2014-03-19 | 中国石油大学(北京) | Experiment device and method for realizing CO2 reservoir oil displacement dynamic monitoring and inversion dynamic simulation |
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| CN105485080A (en) * | 2014-09-24 | 2016-04-13 | 中联重科股份有限公司 | Rotary motor control system and control method thereof |
| CN104806596A (en) * | 2015-05-18 | 2015-07-29 | 上海新跃仪表厂 | Mechanical hydraulic oil source selecting valve |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872546A (en) * | 2017-05-08 | 2018-11-23 | 沈阳航达机载设备有限公司 | A kind of quality detection device suitable for high pressure and low pressure oil liquid |
| CN107607251A (en) * | 2017-09-08 | 2018-01-19 | 上海工业自动化仪表研究院有限公司 | A kind of differential pressure or pressure transmitter with double-range |
| CN107607251B (en) * | 2017-09-08 | 2024-05-14 | 上海工业自动化仪表研究院有限公司 | Differential pressure or pressure transmitter with double measuring ranges |
| CN108593188A (en) * | 2018-04-02 | 2018-09-28 | 哈尔滨工业大学 | A kind of pressure capsule system |
| CN108593188B (en) * | 2018-04-02 | 2020-06-12 | 哈尔滨工业大学 | Pressure sensing system |
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Application publication date: 20160727 |