CN205806625U - A kind of valve control device - Google Patents
A kind of valve control device Download PDFInfo
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- CN205806625U CN205806625U CN201620472503.3U CN201620472503U CN205806625U CN 205806625 U CN205806625 U CN 205806625U CN 201620472503 U CN201620472503 U CN 201620472503U CN 205806625 U CN205806625 U CN 205806625U
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Abstract
This utility model relates to a kind of valve control device, including main control PLC, solid-state relay (SSR), motor, valve actuator and and human-computer interaction module；Described incremental encoder is connected with valve actuator rotating shaft；Export to main control PLC for the rotation amount in valve actuator rotating shaft is changed into pulsed quantity；The input circuit of the control signal output termination solid-state relay of described main control PLC；The output circuit of solid-state relay accesses between power supply and the feeder ear of motor, for controlling the break-make of motor power and the rotating of motor；Described motor is used for driving valve actuator；Form closed loop control；Described human-computer interaction module is connected with the input of main control PLC.This utility model, has that precision is high, reliability high, versatility is good, low cost, an advantage such as convenient to install and maintain, is generally applicable to various types of electrically operated valve.
Description
Technical field
This utility model relates to a kind of valve control device.
Background technology
Valve is to apply one of parts widely in power system, is mainly used in power automation control system
Various fluids carry out flow-control, are one of vitals indispensable in automation equipment and system.General valve control
Device processed uses under the adverse circumstances such as many dust of power system, vibration, high temperature, outdoor, all has a disadvantage in that severe ring
The adaptation ability in border is inadequate, and board often breaks down, and reliability is the highest；It is the most convenient to debug.
Utility model content
This utility model is solved the technical problem that to be, for the deficiencies in the prior art, it is provided that a kind of valve control device,
Versatility and good reliability.
For achieving the above object, the following technical scheme of this utility model offer:
A kind of valve control device, including main control PLC, solid-state relay, motor, valve actuator, incremental encoder and
Human-computer interaction module；
The input circuit of the control signal output termination solid-state relay of described main control PLC；The output electricity of solid-state relay
Road is accessed between power supply and the feeder ear of motor, for controlling the break-make of motor power and the rotating of motor；Described motor
For driving valve actuator；
Described incremental encoder is connected with valve actuator rotating shaft；For the rotation amount in valve actuator rotating shaft is converted
Pulse is become to export to main control PLC；
Described human-computer interaction module is connected with the input of main control PLC, is used for inputting control instruction, shows valve state.
Described solid-state relay uses three-phase rotating solid-state relay.
Described human-computer interaction module includes that " switching mode adjustment type " switching switch, switching input module, 4-20mA simulate
Amount input module, switching value output module and 4-20mA analog output module；Opened by switching " switching mode adjustment type " switching
The state closed, it is achieved the switching mode of valve two controls or adjustment type 4-20mA continuous control, is adapted to switching mode two control
System or the electrically operated valve of adjustment type 4-20mA continuous control；Described switching input module instructs for input switch amount, switch
Amount instruction refers under valve actuator is in the working method that switching mode two controls, the command signal that on an off controls；Institute
State switching value output module to put in place or optional position for output switch amount state, instruction valve open/close.
Described main control PLC is connected with communication module.
Described incremental encoder uses precision to be every high speed incremental encoder turning 1024-4096 above umber of pulse.
Described human-computer interaction module can use touch display screen.
Described main control PLC is also connected with alarm module.
Described main control PLC uses siemens PLC small PLC.Having high-speed pulse counting passage in S7-200, frequency is high
Reach 200kHz, it is ensured that the high accuracy of valve positioner.Main control PLC is for gathering the pulse signal, just of high speed incremental encoder
Ground a distant place switch switching signal and on the spot remote operation command signal, will gather signal, process, realize electricity
Movable valve accurately controls.
The method of work of this utility model valve control device is:
1) when initial power receiving, valve stroke and force moment protection working value are demarcated.
By demarcating valve stroke, two groups of positional informationes are set: one group is the normal position information of valve, represents valve
Open or close the information of putting in place；Another set is the extreme position information of valve, and after valve goes beyond the limit of position, main control PLC will be sent out
Go out stop command, disconnect motor power, stop electrically operated valve action；
2) by high speed incremental encoder, the rotation amount in valve actuator rotating shaft is changed into pulsed quantity to export to master control
PLC；Pulsed quantity is changed into rotary digital amount by main control PLC；By calculating the variable quantity of rotary digital amount signal, obtain electrodynamic valve
The path increment of door action, thus control the traveled distance of electrically operated valve action；
By the variable quantity of the rotary digital amount signal in the unit of account time, obtain the output speed n of motor, further according to
The rated power of motor combines motor output rotating torque formula, and the real time motor output obtained in electrically operated valve course of action turns
Kinetic moment, judged whether moment, stall according to the sizes values of real time motor output rotating torque；
By changing value and the control instruction of comparator more calculated rotary digital amount signal, it is judged that have without instruction
Action or have instruction ignore fault-signal；
By comparator more calculated rotary digital amount signal intensity direction with control instruction switch direction ratio relatively,
Judge whether that phase sequence connects instead；
3) when occur following phenomenon: incremental encoder fault, without instruction have action, have instruction ignore, valve cross moment,
When valve stall, phase sequence connect instead, valve goes beyond the limit of position or overtemperature, main control PLC will send stop command, disconnect motor electricity
Source, stops electrically operated valve action, and concurrent resultant fault is reported to the police and indicated.
State by switching " switching mode adjustment type " switching switch, it is achieved adapt to switching mode two and control or adjustment type
The electrically operated valve of 4-20mA continuous control controls.
When valve control device controls for the electrically operated valve of adjustment type 4-20mA continuous control, for ensureing technological process
Safety, break signal valve is set and protects position (acquiescence), break signal valve wide open or the fully closed Three models of break signal valve, wherein
Break signal refers to: 4-20mA analog input blackout；
And control parameter by human-computer interaction module input, adjust dead band and sensitivity.
Described demarcation valve stroke and force moment protection working value comprise the steps of
Step 1: the valve position information in main control PLC is carried out initialization process, i.e. valve is reached position and pass and arrive
Positional value and the extreme position value of position initialize；
Step 2: make valve (on or off) action more than 5 seconds in the same direction, and keep valve continuously and smoothly work, logical
Cross the variable quantity of rotary digital amount signal in the main control PLC unit of account time, obtain the output speed n of motor, further according to electricity
The rated power of machine combines motor output rotating torque formula, draws motor output rotating torque, master control under normal operating conditions
The motor output rotating torque value of 110% (acquiescence, Parameter adjustable is whole) is entered as force moment protection working value by PLC；
Step 3: after confirming valve to the position opened or closed, now calculates the change of rotary digital amount signal
Amount, obtains the path increment of electrically operated valve action, and main control PLC keeps the positional value that this reaches position or pass puts in place in mind, and automatic assignment is protected
Deposit；Reach position or 95% simultaneously using 105% and close the extreme position value that the positional value put in place opens or closes as valve, and assignment is protected
Deposit.
Above-mentioned motor output rotating torque formula is as follows:
T=9549 × P/n formula 1
Wherein, T is that motor exports rotating torque, and unit is Ngm；P is the rated power of motor, unit K W；N is motor
Output speed, unit is r/min.Directly being shown by above formula: when motor works under nominal power, motor output rotates
Moment is inversely proportional to output speed.
High speed incremental encoder changes into pulsed quantity the rotation amount in valve actuator rotating shaft, and pulsed quantity is converted by PLC
Become rotary digital amount.Variable quantity by the rotary digital amount signal in the unit of account time, it can be deduced that the output of motor turns
Speed n, the rated power further according to motor combines motor output rotating torque formula (formula 1), and then draws electrically operated valve action
During real-time rotating torque.
Described valve positioner is provided with following several protection mechanism:
1, anti-reverse surge protection: valve actuator closes by opening to turn, or is turned on by pass, is provided with when preventing reversion suppression
Between protect, prevent the fastest conversion direction from the impact of equipment, the most effectively protection driver part not damaged.Time is adjustable, acquiescence
500ms；
2, overtemperature prote: the temperature protection switch being embedded in motor coil, the most normally closed, when overtemperature occurs
Time, this switches off, and main control PLC will send stop command, disconnects motor power, stops electrically operated valve work.Wherein, temperature
Protection switch uses motor thermoswitch, normally closed during on off state, and switching signal is accessed main control PLC.
3, there is action protection without instruction: in the case of valve actuator does not has switch order, detect valve and perform
The when that device having change in location, main control PLC will send stop command, disconnect motor power, stop electrically operated valve work.
4, having instruction ignore to protect: when arbitrarily having on an off to instruct when, (time was adjustable, acquiescence at 2 seconds for valve
2s) successor does not so have action, and main control PLC will send stop command, disconnects motor power, stops electrically operated valve work.
5, force moment protection is crossed: working as any time, system detects that valve actuator crosses moment, and main control PLC will send jerk
Instruction, disconnects motor power, stops electrically operated valve work.
Compared with prior art, technical solutions of the utility model have the advantage that
1. precision is high.The precision routine of incremental encoder is every umber of pulse turning more than 1024-4096, valve actuator
One total travel is about about ten thousand pulses of 5-10, and main control PLC acquisition precision can be controlled in a pulse, then travel position
Precision be up to ten thousand/ precision.
2. versatility is high.It is possible not only to control the various valves of power type, it is also possible to pneumatic control valve door is controlled,
Replace expensive pneumatic positioner completely.
3. safety is good.This valve positioner has maltilevel security to protect: break signal processes；Motor overtemperature prote, solid-state continue
Electrical equipment breakdown protection, PLC error protection etc..
4. overlength actuating length.This valve positioner is adapted to the electrically operated valve of any haul distance.
5. control parameter transplantation.When main control PLC needs to change, as long as controlling parameter backup, parameter can will be controlled
Being transplanted to the PLC newly changed, thus valve positioner avoids the need for debugging again, it is possible to direct plunge into operation.Should
Function is in the technological process of production, and when operating mode does not allow electrically operated valve to carry out total travel debugging, effect is the most obvious.And it is existing
If electrically operated valve change after mainboard, it is necessary to carry out total travel debugging.
Accompanying drawing explanation
Fig. 1 is the structure chart of valve positioner.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is further described.As described in Figure 1, the utility model discloses
A kind of valve control device, including main control PLC, solid-state relay SSR, motor, valve actuator, incremental encoder and man-machine friendship
Module mutually；
The input circuit of the control signal output termination solid-state relay of described main control PLC；The output electricity of solid-state relay
Road is accessed between power supply and the feeder ear of motor, for controlling the break-make of motor power and the rotating of motor；Described motor
For driving valve actuator；
Described incremental encoder is connected with valve actuator rotating shaft；For the rotation amount in valve actuator rotating shaft is converted
Pulse is become to export to main control PLC；
Described human-computer interaction module is connected with the input of main control PLC, is used for inputting control instruction, shows valve state.
Described solid-state relay uses three-phase rotating solid-state relay.
Described human-computer interaction module includes that " switching mode adjustment type " switching switch, switching input module, 4-20mA simulate
Amount input module CR, switching value output module and 4-20mA analog output module FB；Cut by switching " switching mode adjustment type "
Change the state of switch, it is achieved the switching mode of valve two controls or adjustment type 4-20mA continuous control, is adapted to switching mode two
Position controls or the electrically operated valve of adjustment type 4-20mA continuous control；Described switching input module instructs for input switch amount,
Switching value instruction refers under valve actuator is in the working method that switching mode two controls, the instruction letter that on an off controls
Number；Described switching value output module is used for output switch amount state, and instruction valve open/close puts in place or optional position.
Described main control PLC is connected with communication module.
Described incremental encoder uses precision to be every high speed incremental encoder turning 1024-4096 above umber of pulse.
Described human-computer interaction module can use touch display screen.
Described main control PLC is also connected with alarm module.
Described main control PLC uses siemens PLC small PLC.Having high-speed pulse counting passage in S7-200, frequency is high
Reach 200kHz, it is ensured that the high accuracy of valve positioner.Main control PLC is for gathering the pulse signal, just of high speed incremental encoder
Ground a distant place switch switching signal and on the spot remote operation command signal, will gather signal, process, it is right to realize
Electrically operated valve accurately controls.
The method of work of this utility model valve control device is:
1) when initial power receiving, valve stroke and force moment protection working value are demarcated.
By demarcating valve stroke, two groups of positional informationes are set: one group is the normal position information of valve, represents valve
Open or close the information of putting in place；Another set is the extreme position information of valve, and after valve goes beyond the limit of position, main control PLC will be sent out
Go out stop command, disconnect motor power, stop electrically operated valve action；
2) by high speed incremental encoder, the rotation amount in valve actuator rotating shaft is changed into pulsed quantity to export to master control
PLC；Pulsed quantity is changed into rotary digital amount by main control PLC；By calculating the variable quantity of rotary digital amount signal, obtain electrodynamic valve
The path increment of door action, thus control the traveled distance of electrically operated valve action；
By the variable quantity of the rotary digital amount signal in the unit of account time, obtain the output speed n of motor, further according to
The rated power of motor combines motor output rotating torque formula, and the real time motor output obtained in electrically operated valve course of action turns
Kinetic moment, judged whether moment, stall according to the sizes values of real time motor output rotating torque；
By calculating changing value and the control instruction of rotary digital amount signal, it is judged that have action without instruction or have instruction without dynamic
Make fault-signal；
By calculating rotary digital amount signal intensity direction with control instruction switch direction ratio relatively, it may be judged whether phase sequence connects
Instead；
3) when occur following phenomenon: incremental encoder fault, without instruction have action, have instruction ignore, valve cross moment,
When valve stall, phase sequence connect instead, valve goes beyond the limit of position or overtemperature, main control PLC will send stop command, disconnect motor electricity
Source, stops electrically operated valve action, and concurrent resultant fault is reported to the police and indicated.
State by switching " switching mode adjustment type " switching switch, it is achieved adapt to switching mode two and control or adjustment type
The electrically operated valve of 4-20mA continuous control controls.
When valve control device controls for the electrically operated valve of adjustment type 4-20mA continuous control, for ensureing technological process
Safety, break signal valve is set and protects position (acquiescence), break signal valve wide open or the fully closed Three models of break signal valve, wherein
Break signal refers to: 4-20mA analog input blackout；
And control parameter by human-computer interaction module input, adjust dead band and sensitivity.
Described demarcation valve stroke and force moment protection working value comprise the steps of
Step 1: the valve position information in main control PLC is carried out initialization process, i.e. valve is reached position and pass and arrive
Positional value and the extreme position value of position initialize；
Step 2: make valve (on or off) action more than 5 seconds in the same direction, and keep valve continuously and smoothly work, logical
Cross the variable quantity of rotary digital amount signal in the main control PLC unit of account time, obtain the output speed n of motor, further according to electricity
The rated power of machine combines motor output rotating torque formula, draws motor output rotating torque, master control under normal operating conditions
The motor output rotating torque value of 110% (acquiescence, Parameter adjustable is whole) is entered as force moment protection working value by PLC；
Step 3: after confirming valve to the position opened or closed, now calculates the change of rotary digital amount signal
Amount, obtains the path increment of electrically operated valve action, and main control PLC keeps the positional value that this reaches position or pass puts in place in mind, and automatic assignment is protected
Deposit；Reach position or 95% simultaneously using 105% and close the extreme position value that the positional value put in place opens or closes as valve, and assignment is protected
Deposit.
Above-mentioned motor output rotating torque formula is as follows:
T=9549 × P/n formula 1
Wherein, T is that motor exports rotating torque, and unit is Ngm；P is the rated power of motor, unit K W；N is motor
Output speed, unit is r/min.Directly being shown by above formula: when motor works under nominal power, motor output rotates
Moment is inversely proportional to output speed.
Therefore, high speed incremental encoder changes into pulsed quantity the rotation amount in valve actuator rotating shaft, and main control PLC is by arteries and veins
Momentum changes into rotary digital amount.Variable quantity by the rotary digital amount signal in the unit of account time, it can be deduced that motor
Output speed n, combine motor output rotating torque formula (formula 1) further according to the rated power of motor, and then draw electronic
Real-time rotating torque during valve event.
A kind of valve control device that the utility model proposes, has the advantages such as precision is high, reliability is high, versatility is good,
It is generally applicable to various types of valve.
Claims (7)
1. a valve control device, it is characterised in that include main control PLC, solid-state relay, motor, valve actuator, increment
Encoder and human-computer interaction module；
The input circuit of the control signal output termination solid-state relay of described main control PLC；The output circuit of solid-state relay connects
Enter between power supply and the feeder ear of motor, for controlling the break-make of motor power and the rotating of motor；Described motor is used for
Drive valve actuator；
Described incremental encoder is connected with valve actuator rotating shaft；For the rotation amount in valve actuator rotating shaft is changed into arteries and veins
Punching output is to main control PLC；
Described human-computer interaction module is connected with the input of main control PLC, is used for inputting control instruction, shows valve state.
Valve control device the most according to claim 1, it is characterised in that described solid-state relay uses three-phase rotating solid
State relay.
Valve control device the most according to claim 2, it is characterised in that described human-computer interaction module include " switching mode adjust
Nodal pattern " switch switch, switching input module, 4-20mA Analog input mModule, switching value output module and 4-20mA simulation
Amount output module；State by switching " switching mode adjustment type " switching switch, it is achieved the switching mode of valve two controls or adjusts
Nodal pattern 4-20mA continuous control.
Valve control device the most according to claim 1, it is characterised in that described main control PLC is connected with communication module.
Valve control device the most according to claim 1, it is characterised in that described incremental encoder uses precision to be every turn
The high speed incremental encoder of 1024-4096 above umber of pulse.
6. according to valve control device according to any one of Claims 1 to 5, it is characterised in that described main control PLC also with warning
Module is connected.
7. according to valve control device according to any one of Claims 1 to 5, it is characterised in that described main control PLC uses west gate
Sub-S7-200 small PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620472503.3U CN205806625U (en) | 2016-05-23 | 2016-05-23 | A kind of valve control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620472503.3U CN205806625U (en) | 2016-05-23 | 2016-05-23 | A kind of valve control device |
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| Publication Number | Publication Date |
|---|---|
| CN205806625U true CN205806625U (en) | 2016-12-14 |
Family
ID=57499532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620472503.3U Active CN205806625U (en) | 2016-05-23 | 2016-05-23 | A kind of valve control device |
Country Status (1)
| Country | Link |
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| CN (1) | CN205806625U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909854A (en) * | 2016-05-23 | 2016-08-31 | 长安益阳发电有限公司 | Valve control device and control method thereof |
| CN110230727A (en) * | 2019-06-26 | 2019-09-13 | 李敏 | It is a kind of can self-examination and the valve being alarmed and be automatically closed in valve damage |
| CN115165339A (en) * | 2021-03-19 | 2022-10-11 | 中国核工业二三建设有限公司 | Multifunctional electric valve test box |
-
2016
- 2016-05-23 CN CN201620472503.3U patent/CN205806625U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105909854A (en) * | 2016-05-23 | 2016-08-31 | 长安益阳发电有限公司 | Valve control device and control method thereof |
| CN110230727A (en) * | 2019-06-26 | 2019-09-13 | 李敏 | It is a kind of can self-examination and the valve being alarmed and be automatically closed in valve damage |
| CN115165339A (en) * | 2021-03-19 | 2022-10-11 | 中国核工业二三建设有限公司 | Multifunctional electric valve test box |
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| GR01 | Patent grant |