CN203176062U - Safety function detecting device of electrohydraulic actuator - Google Patents
Safety function detecting device of electrohydraulic actuator Download PDFInfo
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- CN203176062U CN203176062U CN 201220731037 CN201220731037U CN203176062U CN 203176062 U CN203176062 U CN 203176062U CN 201220731037 CN201220731037 CN 201220731037 CN 201220731037 U CN201220731037 U CN 201220731037U CN 203176062 U CN203176062 U CN 203176062U
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- valve
- safety function
- accumulator
- control
- detection device
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Abstract
The utility model discloses a safety function detecting device of an electrohydraulic actuator in the field of industrial valve control. The safety function detecting device comprises a controller and an electric control loop connected with the controller, wherein the electric control loop is respectively connected with a pressure sensor, a solenoid valve, a handle detecting device and a displacement sensor. The electric control loop is further connected with a hydraulic oil way through the elements of the pressure sensor, the solenoid valve, the handle detecting device and the displacement sensor, and the hydraulic oil way is respectively connected with an energy accumulator, a pressure gage, the pressure sensor, the solenoid valve, a check valve, a first hydraulic control valve, a second hydraulic control valve, a hand valve, an oil cylinder and an oil return device. The safety function detecting device is added, so that the safety function of the electrohydraulic actuator can be detected under the premise that normal control motions of the electrohydraulic actuator are not influenced in the normal use process of the electrohydraulic actuator, furthermore, energy accumulation states of the energy accumulation element energy accumulator can be analyzed in a quantitative mode, and an alarm can be given when accumulated energy is insufficient.
Description
Technical field
The utility model relates to the detection device of industrial valve control usefulness, is specifically related to the detection device of electrohydraulic control Safety function.
Background technique
The detection device of electrohydraulic control generally is applied to the positioning control of industrial valve, and a large amount of electrohydraulic controls Safety function of beginning to participate in device realizes in recent years, as stop in emergency, interlock protection etc.But, because the Safety function of electrohydraulic control only could trigger, so its Safety function all is for non-initiate mode, thereby be difficult to confirm whether its Safety function is intact in most of times when device is in the hole.
The Safety function of electrohydraulic control is used for responding (ESD) event of stopping in emergency, and realizes control action in the mode of limit priority.Because the event of stopping in emergency seldom takes place, thus the Safety function of electrohydraulic control daily all be to be in non-working condition, regularly detecting its Safety function is the important means that improves the electrohydraulic control safety integrity.
At present, some electrohydraulic control products have possessed self-checking function, but great majority all can only detect the action of ESD solenoid valve, Safety function are realized the action etc. of needed charging pressure of accumulator, hydraulic control valve all not have detection.There are part producer all elements to Safety function in its product to detect, but owing to do not carry out informix, the detection of accumulator energy storage capacity is to obtain by a flowmeter observation, shortage can only artificially qualitatively judge the quantitative evaluation of electrohydraulic control product realization Safety function.The shortcoming of tradition electrohydraulic control is that the coverage area that detects is imperfect, and other component relevant with Safety function do not done detection, so the accuracy of testing result is not high.Though the technology detection range after part is improved is comparatively complete, but can only the people for doing qualitative judgement, particularly to the detection of accumulator energy storage, can only detect whether energy storage is arranged, and can't judge that stored high pressure oil is enough, still fundamentally do not solve the problem of detection accuracy.
Because electrohydraulic control is general long-term for non-ESD state, when having only its applied occasion situation to occur stopping in emergency, the Safety function of electrohydraulic control---the ESD function just can be activated, so in order to improve the safety integrity of electrohydraulic control, must regularly detect the realization loop of its Safety function.
The model utility content
The purpose of this utility model is to solve above defective, develop a kind ofly not only to have independently Safety function, and have that comprehensive Safety function detects and diagnostic function detection device.
The purpose of this utility model realizes in the following manner:
The detection device of electrohydraulic control Safety function, comprise controller and the electric control loop that connects with it, this electric control loop is connected with pressure transducer respectively, solenoid valve, handle detection device and displacement transducer, described handle detection device mechanical coupling has manually operated valve, described displacement transducer mechanical coupling has oil cylinder, this electric control loop also is connected with hydraulic circuit by above components and parts, this hydraulic circuit is connected with accumulator respectively, pressure gauge, pressure transducer, solenoid valve, one-way valve, hydraulic control valve one, hydraulic control valve two, manually operated valve, oil cylinder and oil return apparatus, this hydraulic circuit also is connected with the control function module.
Further, described manually operated valve is provided with the handle position detecting switch, is used for the residing state of identification manually operated valve, and this handle position detecting switch includes test position and working position, and its test position and working position can be by manually switching.
Further, this accumulator is bag type accumulator or piston accumulator or spring loaded accumulator, also comprises the accumulator of other variety of way simultaneously.
Further, the energy of savings is nitrogen in this accumulator.
Wherein, the ESD of electrohydraulic control action is by electromagnetic valve hydraulic control valve one and hydraulic control valve two realizations.Also comprise a plurality of solenoid valves with " with " or " or " logic control hydraulic control valve one and the situation of hydraulic control valve two.In the formation loop of Safety function, increased manually operated valve, be used for when test, forming the oil return line that unloads of the stored hydraulic oil of accumulator, and can block and unload oil return line and be connected with the oil circuit of oil cylinder.In the process of accumulator emptying, the pressure that detects accumulator by pressure transducer changes.Manually operated valve is furnished with the handle position detecting switch, is used for the residing state of identification manually operated valve: normal test mode, normal working state and other wrong location status.Solenoid valve is controlled by controller when detecting.During for a plurality of electromagnetic valve ESD function, these solenoid valves also all are controlled by controller in testing process.Pressure drop behind the detected emptying and the standard pressure drop data that is stored in the controller are compared.
Safety function not enabled when not having the ESD instruction, solenoid valve gets electric, and the control oil pressure of hydraulic control valve one and hydraulic control valve two is low pressure, is in closed condition, and the normal control of electrohydraulic control is controlled other control loops by controller and is realized.
Safety function is enabled when ESD instructs, the solenoid valve dead electricity, the control oil pressure of hydraulic control valve one and hydraulic control valve two is high pressure, be in opening state, the high pressure oil of storing in the accumulator drives the oil cylinder quick acting through hydraulic control valve one and hydraulic control valve two with the manually operated valve that is in opening state, thereby realizes the Safety function of electrohydraulic control.
The beneficial effects of the utility model: can be in the normal using process of electrohydraulic control, under the prerequisite that does not influence its normal control action, Safety function to electrohydraulic control detects, simultaneously, detection has covered the whole action components relevant with Safety function, and energy storage state that can quantitative analysis energy-storage travelling wave tube accumulator sends warning when energy storage is not enough.
Description of drawings
Fig. 1 is the loop schematic representation of the detection device of the utility model electrohydraulic control Safety function;
Fig. 2 (a) is standard falloff curve falloff curve schematic representation of the present utility model;
Fig. 2 (b) is normal pressure drop conditional curve of the present utility model;
Fig. 2 (c) is control loop damage curve of the present utility model;
Fig. 2 (d) fills nitrogen underpressure curve for accumulator of the present utility model.
Among Fig. 1, the loop that dotted line connects is electric control loop, and the loop that solid line connects is hydraulic circuit, (1) accumulator, (2) pressure gauge, (3) pressure transducer, (4) solenoid valve, (5) one-way valve, (6) hydraulic control valve one, (7) hydraulic control valve two, (8) handle detection device, (9) manually operated valve, (10) oil cylinder, (11) displacement transducer, (12) controller, (13) oil return apparatus.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.
Present embodiment, with reference to Fig. 1, the detection device of electrohydraulic control Safety function, comprise controller (12) and the electric control loop that connects with it, this electric control loop is connected with pressure transducer (3) respectively, solenoid valve (4), handle detection device (8) and displacement transducer (11), described handle detection device (8) mechanical coupling has manually operated valve (9), described displacement transducer (11) mechanical coupling has oil cylinder (10), this electric control loop also is connected with hydraulic circuit by above components and parts, this hydraulic circuit is connected with accumulator (1) respectively, pressure gauge (2), pressure transducer (3), solenoid valve (4), one-way valve (5), hydraulic control valve one (6), hydraulic control valve two (7), manually operated valve (9), oil cylinder (10) and oil return apparatus (13), this hydraulic circuit also is connected with the control function module.
In addition, described manually operated valve (9) is provided with the handle position detecting switch, is used for the residing state of identification manually operated valve (9), and this handle position detecting switch includes test position and working position, and its test position and working position can be by manually switching.The energy of savings is nitrogen in this accumulator (1).Because in the Safety function testing process, the Safety function of electrohydraulic control is invalid, so in order to remind the user, be furnished with detection device at manually operated valve (9), when electrohydraulic control was in the Safety function testing process, detection device sent signal to the control room.Simultaneously, the proper functioning position of manually operated valve (9) handle is arranged in the cabinet, and the test position of handle is arranged in outside the cabinet, so that User Recognition.
Safety function not enabled when not having the ESD instruction, solenoid valve (4), the control oil pressure of hydraulic control valve one (6) and hydraulic control valve two (7) is low pressure, is in closed condition, and the normal control of electrohydraulic control is controlled other control loops by controller (12) and realized.
Safety function is enabled when ESD instructs, solenoid valve (4) dead electricity, the control oil pressure of hydraulic control valve one (6) and hydraulic control valve two (7) is high pressure, be in opening state, high pressure oil process hydraulic control valve one (6) and the hydraulic control valve two (7) of storing in the accumulator (1) and the manually operated valve (9) that is in opening state drive oil cylinder (10) quick acting, thereby realize the Safety function of electrohydraulic control.
Expansion as right, described in Fig. 1 is situation for a solenoid valve (4), in order to improve reliability, can increase one or more solenoid valves (4), with the logical relation of solenoid valve (4) formation multiselect one, realize that arbitrary solenoid valve (4) dead electricity can both trigger the ESD action.Also can increase one or more solenoid valves (4), constitute the many logical relations of multiselect with solenoid valve (4), realize having only whole solenoid valves (4) dead electricity could trigger the ESD action, non-whole solenoid valves (4) dead electricity then can not trigger the ESD action.Described in Fig. 1 is the principle of dead electricity ESD, also can be by changing the element type selecting or changing the oil circuit annexation, realize the function of electric ESD.During for a plurality of solenoid valves (4) control ESD action, can detect by controlling solenoid valve (4) action one by one, also can realize that hydraulic control valve one (6) and hydraulic control valve two (7) are the function of general work state for control oil circuit decompression ESD, high pressure by changing the element type selecting or changing the oil circuit annexation.The direction of the oil cylinder that is not limited to indicate among Fig. 1 (10) ESD changes the connection of oil circuit, also goes for the situation that opposite direction is the ESD direction.
The utility model patent can be in the normal using process of electrohydraulic control, under the prerequisite that does not influence its normal control action, Safety function to electrohydraulic control detects, simultaneously, detection has covered the whole action components relevant with Safety function, and energy storage state that can quantitative analysis energy-storage travelling wave tube accumulator (1) sends warning when energy storage is not enough.
The detecting method of the detection device of present embodiment, manually operated valve (9) need be placed the test position during detection, controller (12) is controlled solenoid valve (4) dead electricity then, the high pressure oil that accumulator (1) stores can pass through hydraulic control valve two (7), manually operated valve (9), hydraulic control valve one (6) to oil return apparatus (13), and meanwhile controller (12) detects and accumulator (1) connected system oil pressure in real time by pressure transducer (3).Through after predetermined time, controller (12) control solenoid valve (4) resets, and carries out the judgement of Safety function integrity then according to the method for the following stated.
This detecting method step is as follows:
A. go up test starting command at controller (12);
B. manually operated valve (9) is pulled the test position, after putting in place, handle detection device (8) sends the beginning testing signal to controller (12);
C. controller (12) is controlled solenoid valve (4) dead electricity, and controller (12) is gathered the signal of pressure transducer (3) simultaneously;
D. transit time T, controller (12) control solenoid valve (4) recover;
E. controller (12) is by calculating the pressure drop data of T time pressure sensor (3);
F. controller (12) carries out data analysis, and data analysis is as follows:
Pressure drop data equals zero or close to zero the time, the ESD control loop fault that controller (12), solenoid valve (4), hydraulic control valve one (6) and hydraulic control valve two (7) constitute; Pressure drop data is during greater than setting value, and accumulator (1) pressurising deficiency can't satisfy the action request of ESD; Pressure drop data less than setting value simultaneously significantly greater than zero the time, the ESD action request is satisfied in ESD control loop and accumulator (1) energy storage, and according to the Reference data contrast of pressure drop data and controller storage, can obtain the qualitative assessment of accumulator (1) energy storage state.
The detecting method of present embodiment, see figures.1.and.2, among Fig. 2, P is the pressure of pressure transducer (3), and T is the pressure drop time, and Δ P is pressure drop data, (a) be the standard falloff curve, (b) being normal pressure drop conditional curve, is the control loop damage curve (c), (d) fills nitrogen underpressure curve for accumulator (1).If Safety function loop each several part is working properly, the falloff curve of testing process will show as the form of (b) among Fig. 2.If the control loop of Safety function is failed action as scheduled, comprise that solenoid valve (4) does not move, hydraulic control valve one (6) and hydraulic control valve two (7) do not move, then falloff curve will show as the form of (c) among Fig. 2.If accumulator (1) fills the nitrogen underpressure, when control loop moved as scheduled, falloff curve will show as the form of (d) among Fig. 2.Further, under the prerequisite that, pressure drop time T known at the starter system oil pressure fixed, oil hydraulic circuit is fixing, there is corresponding relation in the nitrogen pressure that fills of Δ P and accumulator (1), therefore, by to the measurement of Δ P and Reference data contrast, what just can draw accumulator (1) fills the nitrogen pressure value.The falloff curve of standard is imported before electrohydraulic control dispatches from the factory in the controller (12).When testing result is (c) or (d) during the situation of form, controller (12) sends warning message to the control room.
Because when carrying out the detection of Safety function, the Safety function of electrohydraulic control is invalid, finishes in back or the normal using process so detect, and it is extremely important the operating grip that detects usefulness to be positioned over " using " position.The utility model can make the user be easy to identify the detected state of Safety function and using state, can effectively avoid misoperation, has improved the safety integrity of electrohydraulic control.
Above content be in conjunction with concrete preferred embodiment to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as protection domain of the present utility model.
Claims (4)
1. the detection device of electrohydraulic control Safety function, it is characterized in that: comprise controller and the electric control loop that connects with it, this electric control loop is connected with pressure transducer respectively, solenoid valve, handle detection device and displacement transducer, described handle detection device mechanical coupling has manually operated valve, described displacement transducer mechanical coupling has oil cylinder, this electric control loop also is connected with hydraulic circuit by above components and parts, this hydraulic circuit is connected with accumulator respectively, pressure gauge, pressure transducer, solenoid valve, one-way valve, hydraulic control valve one, hydraulic control valve two, manually operated valve, oil cylinder and oil return apparatus, this hydraulic circuit also is connected with the control function module.
2. according to the detection device of the described electrohydraulic control Safety function of claim 1, it is characterized in that: described manually operated valve is provided with the handle position detecting switch, be used for the residing state of identification manually operated valve, this handle position detecting switch includes test position and working position, and its test position and working position can be by manually switching.
3. according to the detection device of the described electrohydraulic control Safety function of claim 1, it is characterized in that: this accumulator is bag type accumulator or piston accumulator or spring loaded accumulator.
4. according to the detection device of the described electrohydraulic control Safety function of claim 1, it is characterized in that: the energy of savings is nitrogen in this accumulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220731037 CN203176062U (en) | 2012-12-26 | 2012-12-26 | Safety function detecting device of electrohydraulic actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220731037 CN203176062U (en) | 2012-12-26 | 2012-12-26 | Safety function detecting device of electrohydraulic actuator |
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| Publication Number | Publication Date |
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| CN203176062U true CN203176062U (en) | 2013-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220731037 Expired - Lifetime CN203176062U (en) | 2012-12-26 | 2012-12-26 | Safety function detecting device of electrohydraulic actuator |
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| CN (1) | CN203176062U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650061A (en) * | 2016-04-05 | 2016-06-08 | 中国重型机械研究院股份公司 | Hydraulic cylinder position following system with fault self-diagnosis function and control method |
| CN107559264A (en) * | 2017-09-22 | 2018-01-09 | 重庆红江机械有限责任公司 | Accumulator flow experimental rig |
| CN112412895A (en) * | 2020-12-04 | 2021-02-26 | 潍柴动力股份有限公司 | Hydraulic system exhaust control method and device |
-
2012
- 2012-12-26 CN CN 201220731037 patent/CN203176062U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105650061A (en) * | 2016-04-05 | 2016-06-08 | 中国重型机械研究院股份公司 | Hydraulic cylinder position following system with fault self-diagnosis function and control method |
| CN107559264A (en) * | 2017-09-22 | 2018-01-09 | 重庆红江机械有限责任公司 | Accumulator flow experimental rig |
| CN107559264B (en) * | 2017-09-22 | 2019-11-26 | 重庆红江机械有限责任公司 | Accumulator flow experimental rig |
| CN112412895A (en) * | 2020-12-04 | 2021-02-26 | 潍柴动力股份有限公司 | Hydraulic system exhaust control method and device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130904 |