CN2460976Y - Constant tension servo-type float level meter - Google Patents
Constant tension servo-type float level meter Download PDFInfo
- Publication number
- CN2460976Y CN2460976Y CN 00230705 CN00230705U CN2460976Y CN 2460976 Y CN2460976 Y CN 2460976Y CN 00230705 CN00230705 CN 00230705 CN 00230705 U CN00230705 U CN 00230705U CN 2460976 Y CN2460976 Y CN 2460976Y
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- CN
- China
- Prior art keywords
- fixed pulley
- float
- tension servo
- float level
- ropes
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- Expired - Fee Related
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Abstract
The utility model relates to a constant tension servo-type float liquid level meter, which comprises a float, a hoisting rope, a measuring fixed pulley and an overline pulley, wherein, the other end of the hoisting rope is connected with a winding drum via the measuring fixed pulley; a force measuring element is arranged in a hoisting driving transmission chain of the hoisting rope; the winding drum is driven by a servo motor which is controlled by an adjusting controller which is connected with a signal output opening of the force measuring element. The utility model has the advantages of large measuring range, high precision, compact structure, perfect functions, convenient installation and convenient operation. The utility model which can realize liquid level fast tracking and measurement has better dynamic response characteristic.
Description
The utility model belongs to a kind of liquid level emasuring device, is applicable to the sump level measuring of ship lock, reservoir area etc., also can be used for the level gauging of basin, liquid storage tank etc.
Power station, ship lock, navigation channel etc. need use various level measurement devices in a large number, and that uses at present mainly contains microwave type, throw-in type, air blowing type and float-type etc., and wherein using many is float Weight and disk type liquid level gauge.This fluid level measuring instrument mainly comprises float, hoisting cable, stroke throw-over gear, rope drawing machine structure and a photoelectric code disk (photoelectric encoder) etc. that can float on the liquid level.At work, float is corresponding lifting with liquid level change, the wire rope that is attached thereto also rises synchronously or descends, and the rectilinear motion of stroke throw-over gear wire rope converts to and rotatablely moves, and photoelectric code disk calculates the liquid level change value by the angle variable quantity that detects rotation.According to the difference of rope drawing machine structure, float Weight and disk type liquid level gauge can be divided into damper weight hammer and constant force disc spring formula again.In actual application, damper weight hammer liquid level gauge exist wire rope easily and pulley skid and cause measuring error, and change because of wire rope folding and unfolding length variations makes additional gravity, make hoisting cable keep constant force fully and influence the situation of measuring accuracy.Also there is the problem that balance weight is easy and the float hoisting cable is interfered mutually in addition, constant force disc spring formula then exists range to be subjected to the wind spring length restriction, can't accomplish large range measuring, wind spring can't reach complete constant force and influence the problem of measuring accuracy in impulse stroke.Traditional float Weight and disk type liquid level gauge all exists can't accomplish the shortcoming of tracking measurement accurately when liquid level change is rapid.
The purpose of this utility model is exactly to improve the weak point of above-mentioned traditional float code-disc liquid level gauge, design a kind of big range ability that has, high precision and better dynamic response characteristic can realize the permanent tension servo formula float level meter of the quick tracking measurement of liquid level.
The purpose of this utility model is realized by following technical scheme: comprise float 1, ropes 2, measure fixed pulley 7 and wire-crossing wheel, the other end of ropes links through measuring fixed pulley and reel 10, its difference is to be provided with load-sensing unit 3 in the lifting driving driving-chain of ropes, reel drives by servomotor 11, servomotor is controlled by adjustment control, and the signal output of adjustment control and load-sensing unit joins.
During the utility model work, a float part is submerged in the liquid, and another part exposes on liquid level, is floating state.This moment, float was subjected to the influence of three power, the lifting force of the ropes that promptly makes progress (rope tension) F1, and liquid is to the gravity W of the buoyancy F2 of float and downward float, and making a concerted effort of three power is zero, i.e. and ∑ F=F1+F2-W=0, so float is in the dynamic balance state.The gravity of float remains unchanged, and when the depth of immersion of float was constant, the buoyancy that float is subjected to was also constant, and rope is produced by servomotor rotating drum tensioning rope the lifting force of float.It is a definite value that system can be set.When liquid level remained unchanged, three power also kept constant, and rope does not produce motion, measured fixed pulley and did not rotate, and the level value that liquid level gauge is measured also keeps certain value.When tested liquid level changes when rising: the depth of immersion of float will increase, thereby the buoyancy of float will increase and destroy former dynamic balance state, float be risen, the lifting force decline that float rises and will make rope.At this moment, the variation of rope lifting force can pass to load-sensing unit, load-sensing unit is given adjustment control with the lifting force signal feedback, by comparison to setting lifting force F1 and measuring lifting force F1 ＇, produce an error controling signal, regulate the driving servomotor by PID regulator in the adjustment control and drive controlling, motor is just changeing hauls reel, make the lifting force of rope come back to setting value F1, if water level stops to change, motor will stop operating and be in the stall state, the stressed equilibrium state that comes back to of float, and the depth of immersion of float is tending towards initial value again.When liquid level descended: the depth of immersion of float will reduce, buoyancy also will reduce, thereby float is descended, the comparison that it is F1 that the decline of float can make the stressed increase of rope "; same; that the lifting force variation of rope can pass to load-sensing unit; that load-sensing unit is given adjustment control with the lifting force signal feedback; by to setting lifting force F1 and measuring lifting force F1 ", produce an error controling signal, regulate driving servomotor, the motor counter-rotating makes the reel payout, and the lifting force of rope comes back to setting value F1, if water level stops to change, motor will stop operating and be in the stall state, the stressed equilibrium state that comes back to of float, and the depth of immersion of float is tending towards initial value again.This balance of float is a kind of homeostasis process, is the balance of a kind of active and autonomous type under the servo-drive system effect.Rising and decline along with water level, follow the tensioning of the rope in the homeostasis process and loosen, measuring fixed pulley will rotate synchronously, the angle measurement element is by detecting the anglec of rotation of measuring fixed pulley, can calculate the folding and unfolding length of rope, thereby record the stroke that float rises or descends, that is the size of level value.
The utility model has been introduced the servo-drive system of being made up of servomotor and adjustment control, the servomotor that drives reel is under the effect of PID regulator, can regulate driving force in real time according to the feedback signal of load-sensing unit, make the tension force of ropes keep constant.Carry out permanent Tension Control and can also eliminate the influence that gear train such as change in friction force such as motor shaft and spool shaft cause, thereby improve the precision of level gauging.Owing to adopt servomotor as the rope drawing machine structure, also improved range ability and folding and unfolding rope speed greatly.The utility model can just change, reverse, brake isoparametric control to motor, thereby carries out the parameter control of power, speed, limit height etc., satisfies various special measurement requirement preferably.The utility model compact conformation, perfect in shape and function, easy to install and use.
Fig. 1 is the structural drawing of an embodiment of the utility model.
Fig. 2 is control, the measuring system block diagram of an embodiment of the utility model.
Fig. 3 is control, the measuring system block diagram of another embodiment of the utility model.
Fig. 4 is the circuit theory diagrams of load-sensing unit and power transmitter among embodiment of the utility model.
Fig. 5 is the circuit theory diagrams of PID regulator and driving governor among embodiment of the utility model.
First embodiment of the present utility model such as Fig. 1,2,4, shown in 5, include float 1, hang the ropes 2 of tractive float, ropes is generally wire rope, above float, be installed on and measure fixed pulley 7, measure configuration angle measurement element 6 on the fixed pulley, ropes twine to be measured fixed pulley 7 and through wire-crossing wheel 4, link with reel 10 after 12 tensionings, at the upper and lower sides of measuring fixed pulley fabric wheel 8 is installed also, 5, work to compress ropes and prevent that it is from measuring slippage on the fixed pulley, fabric wheel is made of pinch roller and spring, reel 10 is arranged on a side of measuring fixed pulley, and link with servomotor, servomotor can link by shaft coupling and reel, is installed on load-sensing unit 3 on the support of measuring the wire-crossing wheel 4 of introducing ropes below the fixed pulley, load-sensing unit is transferred to adjustment control by power transmitter with signal, the circuit of load-sensing unit and power transmitter as shown in Figure 4, load-sensing unit is a strain pressure transducer, by RY
1, RY
2, RY
3Form P with the PY foil gauge
1Be the zero potentiometer of amplifying circuit, P
2Be the sensitivity adjusting potentiometer, power transmitter comprises high precision operating amplifier U
1With secondary voltage-stabilizing device U
9, U
10, R
1, R
2Be input resistance, R
5Be feedback resistance, J
2Be its signal input/output port; Adjustment control is made up of PID regulator and driving governor, is used for control and drive servomotor 11, and driving governor comprises differential amplifier, voltage follower, phase shift trigger and controllable silicon drive circuit, its circuit as shown in Figure 5, P
20Being the given potentiometer of PID, also is the given potentiometer of tension value, R
40Be input resistance, R
41Input resistance for feedback signal.R
44, R
43, C
21, R
40, R
41With U
8Form an approximate pi regulator together, so the PID regulator of this system is actually an approximate pi regulator, C
21Be integrating capacitor, R
43Be the feedback resistance of determining the static enlargement factor of pi regulator, R
44And C
21Determine approximate integration time constant, differential amplifier is by U
3A, R
20-R
24And R
45Form, its effect is to carry out level conversion, and it comes down to the subtracting amplifier of a both-end input, by amplifying the back voltage ascending amount of pi regulator is changed into falling quantity of voltages.This control signal outputs to phase shift trigger by voltage follower, as the input signal of phase shift trigger.Voltage follower plays isolation drive.Phase shift trigger is made up of TCA785 and peripheral element.TCA785 is the phase shift trigger of a linear rising sawtooth wave, when phase-shifting voltages for hour, silicon controlled conduction angle maximum, when phase-shifting voltages is maximum, the conduction angle minimum.TCA785 exports two-way, and one the tunnel is A
2, positive half cycle triggers, and one the tunnel is A
1, negative half period triggers, the A among this figure
2Output is in the positive half cycle triggering of alternating voltage.Driving circuit is by controllable silicon, and fly-wheel diode and resistance capaciting absorpting circuit are formed.S among the figure
1Be one-way SCR, D
7Be the fly-wheel diode in parallel with the motor lines bag.R
32, C
9Be resistance capaciting absorpting circuit.L
1Be the line bag of servomotor, pass through J
3Provide electrical source of power to servomotor, J
4Provide synchronizing signal to phase shift trigger.Servomotor can be permanent magnetic DC torque motor.The angle measurement element that links with the measurement fixed pulley is transferred to liquid level display by resolving the unit with signal, processing by liquid level display and resolving, directly demonstrate the height of the liquid level of surveying, can establish the teletransmission output interface on the liquid level display, so that the long-distance transmissions of signal, above-mentioned each assembly is except that float and part ropes, and other all can be installed in the case shell 9.
Second embodiment of the utility model as shown in Figure 3, the main difference part of it and a last embodiment is to install a torque sensor as load-sensing unit on the rotation axis between servomotor and reel, other parts are identical with a last embodiment.When the lifting force on the ropes changes, proportional variation also will take place in the moment of torsion on the rotation axis, the torque value of actual measurement torque value and setting is compared, regulate turning to and output current of control servomotor by PID, make rope tension or loosen, moment keeps a steady state value, thereby makes float be in a kind of dynamic equilibrium state, and the stroke of float and liquid level change keep synchronously.This mode can realize the purpose that the utility model is desired to reach equally.
Claims (7)
1, a kind of permanent tension servo formula float level meter, comprise float (1), ropes (2), measure fixed pulley (7) and wire-crossing wheel, the other end of ropes links through measuring fixed pulley and reel (10), it is characterized in that in the lifting driving driving-chain of ropes, being provided with load-sensing unit (3), reel drives by servomotor (11), servomotor is controlled by adjustment control, and the signal output of adjustment control and load-sensing unit joins.
2, by the described permanent tension servo formula float level meter of claim 1, it is characterized in that measuring configuration angle measurement element (6) on the fixed pulley, ropes is twined measurement fixed pulley (7) and is linked with reel after wire-crossing wheel (4), (12) tensioning.
3,, it is characterized in that fabric wheel (8), (15) being installed at the upper and lower sides of measuring fixed pulley by claim 1 or 2 described permanent tension servo formula float level meters.
4,, it is characterized in that on the support of the wire-crossing wheel (4) of introducing ropes below the measurement fixed pulley, being installed on load-sensing unit (3) by claim 1 or 2 described permanent tension servo formula float level meters.
5, by claim 1 or 2 described permanent tension servo formula float level meters, it is characterized in that in the rotating shaft between servomotor and reel, installing a torque sensor as load-sensing unit.
6, by claim 1 or 2 described permanent tension servo formula float level meters, it is characterized in that load-sensing unit (3) is transferred to adjustment control by power transmitter with signal, adjustment control is made up of PID regulator and driving governor.
7,, it is characterized in that the angle measurement element that links with the measurement fixed pulley is transferred to liquid level display by resolving the unit with signal by claim 1 or 2 described permanent tension servo formula float level meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00230705 CN2460976Y (en) | 1999-06-16 | 2000-08-24 | Constant tension servo-type float level meter |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99238520.2 | 1999-06-16 | ||
| CN99238520 | 1999-06-16 | ||
| CN 00230705 CN2460976Y (en) | 1999-06-16 | 2000-08-24 | Constant tension servo-type float level meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2460976Y true CN2460976Y (en) | 2001-11-21 |
Family
ID=34064227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00230705 Expired - Fee Related CN2460976Y (en) | 1999-06-16 | 2000-08-24 | Constant tension servo-type float level meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2460976Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101566492B (en) * | 2009-06-03 | 2011-04-20 | 吴军保 | Liquid storage tank liquid-level meter |
| CN108143275A (en) * | 2018-01-31 | 2018-06-12 | 李督 | A kind of safe and reliable household direct drinking fountain |
| CN109374193A (en) * | 2018-11-21 | 2019-02-22 | 中铁大桥科学研究院有限公司 | A kind of Oversea bridge steel suspended box cofferdam wave lift measuring device and method |
| CN109883490A (en) * | 2019-04-02 | 2019-06-14 | 施桂英 | A kind of intelligent flood control monitoring device of hydraulic engineering |
| CN111103037A (en) * | 2020-03-04 | 2020-05-05 | 东营职业学院 | Intelligent multifunctional oil field floater liquid level meter |
| CN112050909A (en) * | 2020-08-11 | 2020-12-08 | 北京顺祥宏达电力设备有限公司 | Water level safety monitoring system |
| CN113324612A (en) * | 2021-05-28 | 2021-08-31 | 山东省海河淮河小清河流域水利管理服务中心 | Water level tracking and measuring system in pipeline |
-
2000
- 2000-08-24 CN CN 00230705 patent/CN2460976Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101566492B (en) * | 2009-06-03 | 2011-04-20 | 吴军保 | Liquid storage tank liquid-level meter |
| CN108143275A (en) * | 2018-01-31 | 2018-06-12 | 李督 | A kind of safe and reliable household direct drinking fountain |
| CN108143275B (en) * | 2018-01-31 | 2019-12-17 | 台州统发机械有限公司 | Safe and reliable household direct water dispenser |
| CN109374193A (en) * | 2018-11-21 | 2019-02-22 | 中铁大桥科学研究院有限公司 | A kind of Oversea bridge steel suspended box cofferdam wave lift measuring device and method |
| CN109883490A (en) * | 2019-04-02 | 2019-06-14 | 施桂英 | A kind of intelligent flood control monitoring device of hydraulic engineering |
| CN111103037A (en) * | 2020-03-04 | 2020-05-05 | 东营职业学院 | Intelligent multifunctional oil field floater liquid level meter |
| CN112050909A (en) * | 2020-08-11 | 2020-12-08 | 北京顺祥宏达电力设备有限公司 | Water level safety monitoring system |
| CN112050909B (en) * | 2020-08-11 | 2023-08-18 | 北京顺祥宏达电力设备有限公司 | Water level safety monitoring system |
| CN113324612A (en) * | 2021-05-28 | 2021-08-31 | 山东省海河淮河小清河流域水利管理服务中心 | Water level tracking and measuring system in pipeline |
| CN113324612B (en) * | 2021-05-28 | 2023-08-25 | 山东省海河淮河小清河流域水利管理服务中心 | System for tracking and measuring water level in pipeline |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |