CN101246029A - Electromechanical high-precision liquid level measurer - Google Patents

Electromechanical high-precision liquid level measurer Download PDF

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Publication number
CN101246029A
CN101246029A CNA2008100197917A CN200810019791A CN101246029A CN 101246029 A CN101246029 A CN 101246029A CN A2008100197917 A CNA2008100197917 A CN A2008100197917A CN 200810019791 A CN200810019791 A CN 200810019791A CN 101246029 A CN101246029 A CN 101246029A
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CN
China
Prior art keywords
liquid level
bracing frame
nut
motor
sensor
Prior art date
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Pending
Application number
CNA2008100197917A
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Chinese (zh)
Inventor
冷护基
李兵
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Anhui University of Technology AHUT
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Anhui University of Technology AHUT
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Publication date
Application filed by Anhui University of Technology AHUT filed Critical Anhui University of Technology AHUT
Priority to CNA2008100197917A priority Critical patent/CN101246029A/en
Publication of CN101246029A publication Critical patent/CN101246029A/en
Pending legal-status Critical Current

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  • Level Indicators Using A Float (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The invention provides an electromechanical high-precision measuring instrument of liquid level and belongs to the technical field of instrument measuring. The electromechanical high-precision measuring instrument of liquid level is composed of an electric motor, a speed reducer, an encoder, a screw rod, a nut, a liquid level sensor, support frames, a sensor displacement device, a balancing device, a storage tank, a proximity switch and a controller; the sensor displacement device comprises the nut, a guide rod that is fixed on the nut and the liquid level sensor that is fixedly connected on the guide rod, and the guide rod runs through a guide orifice on the support frame; the balancing device comprises a balancing block, a steel wire rope and a pulley; the support frames are fixed on the inner wall of the storage tank, the encoder is fixedly connected on a rear shaft of the electric motor, the electric motor and the speed reducer are fixedly connected on the support frame, the upper end of the screw rod is connected with the output shaft of the speed reducer, the lower end of the screw rod is fixedly connected with the support frame, the guide rod is arranged on the nut and implements guidance through the guide orifice of the support frame. The electromechanical high-precision measuring instrument of liquid level has the advantages of high measuring precision, simple and convenient operation, cheapness and safety, etc.

Description

Electromechanical high-precision liquid level measurer
Technical field
The invention belongs to the instrument measurement technical field, be specifically related to a kind of electromechanical high-precision liquid level measurer.
Background technology
At present, High Accuracy Liquid Level Measuring System is used HTG system of company of Rosemount China Inc. comparatively generally in the whole world, the core component of this system is the high-precision intelligent pressure unit, its built-in storer of this sensor has many temperature compensation curve, to overcome the error that transmitter brings because of temperature variation in the HTG system, precision can reach below the 0.05%FS, be suitable for the Level Detection in the crude oil storage tank, its weak point is that HTG system price costliness is difficult to domestic most of enterprise always and accepts.Disclosed as Chinese patent publication number CN2067824U is a kind of raster pattern tank level measuring instrument, it is by floating drum, traction rope, guide rope, pulley blocks, the grating chi, cable, parts such as interface and computing machine are formed, the floating drum that the below is provided with weight is suspended in the wet tank by traction rope, hang with weight, the guide rope that is fixed on tank top places the guide lugs that is welded in the floating drum both sides, the grating chi that displacement signal can be transferred to pulse signal is housed on the pulley blocks, the grating chi is connected with the interface that pulse signal can be converted to digital signal by cable, go out liquid level by COMPUTER CALCULATION, its weak point is that float draft changes greatly, transmission stability is poor, bearing accuracy is not high, and measuring error is bigger than normal.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of precision height, simple in structure, good reliability, low-cost electromechanical high-precision liquid level measurer are provided.
Electromechanical high-precision liquid level measurer provided by the present invention is by motor 2, reductor 3, scrambler 1, leading screw 11, nut 9, liquid level sensor 13, bracing frame 4, bracing frame 6, sensor gearshift, balance device, storage tank 15, constitutes near switch 5 and controller; Described sensor gearshift comprises nut 9 and is fixed on the guide pole 10 on the nut 9 and connects firmly liquid level sensor 13 on guide pole 10, guide pole 10 passes the pilot hole on the bracing frame 6, at the initial position state, the sensor gearshift at storage tank 15 tops by near switch 5 location; Described balance device comprises counterbalance weight 12, wire rope 7 and pulley 8, and pulley 8 is fixed in the top of storage tank 15, and wire rope 7 one ends and nut 9 link, and the other end and counterbalance weight 12 link; Bracing frame 4 and bracing frame 6 are fixed on the inwall of storage tank 15, scrambler 1 connects firmly on motor 2 tailing axles, motor 2 and reductor 3 connect firmly on bracing frame 4, leading screw 11 upper ends are connected with the output shaft of speed reduction unit 3, lower end and bracing frame 6 connect firmly, guide pole 10 is installed on the nut 9, and guide pole 10 is by the pilot hole guiding of bracing frame 6; Bracing frame 4, bracing frame 6 are installed on the inwall of storage tank 15; Motor 2, scrambler 1, be connected with controller with power line near the signal wire of switch 5, liquid level sensor 13.
Described motor 2 is fire proof motor or stepper motor or is the motor of tight device with lock; The quantity that connects firmly the liquid level sensor 13 on guide pole 10 in the described sensor gearshift is 1-10, and liquid level sensor 13 is a little differential pressure sensor.Described controller is core with the single-chip microcomputer, the signal of liquid level sensor inserts single-chip microcomputer through the A/D conversion, the signal of scrambler inserts the counter T0 of single-chip microcomputer inside, insert single-chip microcomputer P0 mouth near switch 5, the delivery outlet and the solid-state relay of single-chip microcomputer join, be used for drive motor, the delivery outlet of single-chip microcomputer is by display driver circuit driving display and keyboard.
The present invention compared with prior art has: dynamo-electric mechanism is simple, handling safety reliable, measuring accuracy can reach the millimeter level, the measurement mechanism cost is low.
Description of drawings
Fig. 1 is the electromechanical high-precision liquid level measurer structure diagram;
Among the figure: 1: scrambler, 2: motor, 3: reductor, 4: bracing frame, 5: near switch, 6: bracing frame, 7: wire rope, 8: pulley, 9: nut, 10: guide pole, 11: leading screw, 12: counterbalance weight, 13: liquid level sensor, 14: liquid level sensor, 15: storage tank
Fig. 2 is a controller block scheme of the present invention;
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
Show as Fig. 1, the general height of petroleum storage tank is about 10 meters, and leading screw 11 is long more, processing technology is complicated more, and global error is bigger, so preferred version is designed to 2 meters long with leading screw 11, two guide poles 10 that 8-10 rice is long is installed on the nut 9, connect firmly a liquid level sensor 13 every 2 meters distances on the guide pole 10, connect 5 altogether; Using 2 meters long leading screws 11 to carry out under the transmission situation like this, measuring instrument can accurately be measured tank level in 10 meters scopes.
Before the measurement, 11 rotations of motor 2 rotating band movable wire thick sticks, nut 9 moves upward, when nut 9 tops trigger switch near the time near switch 5, single-chip microcomputer is received trigger pip near switch 5 control circuits, and sends simultaneously and stop the motor rotating signal, and motor 2 stops, zeroing finishes, and promptly is the reference point that detects.Known apart from the height of irritating the end near switch 5, liquid level sensor 13 is apart from the location aware near switch 5.
During measurement, motor 2 drives leading screw 11 drive nuts 9 and moves downward, and 5 liquid level sensors also move down simultaneously.Scrambler 1 connects with motor coaxle, and scrambler 2 can detect the rotating cycle of leading screw 11, and detected pulse data is input to single-chip microcomputer, can obtain the shift length S of leading screw 11 by the computing of single-chip microcomputer.
In the measuring process, the online from top to bottom change amount signal of patrolling and examining 5 liquid level sensors of single-chip microcomputer, and signal is input to carries out computing in the controller, can obtain density gradient, mass change value and oil water surface (to the crude oil medium) under each millimeter of medium fluid level condition.After measuring, the sensor gearshift is got back to storage tank 15 tops by resetting near switch 5.
In order to reduce power of motor, increase explosion-proof security, increase the lead screw pair self-locking property, designed the balance device of forming by counterbalance weight 12, pulley 8 and wire rope 7 among the present invention, be used for the weight of balance pair of nut, guide pole and 5 little differential pressure sensors etc.

Claims (4)

1, electromechanical high-precision liquid level measurer is characterized in that this fluid level measuring instrument is by motor (2), reductor (3), scrambler (1), leading screw (11), nut (9), liquid level sensor (13), bracing frame (4), bracing frame (6), sensor gearshift, balance device, constitute near switch (5) and controller; Described sensor gearshift comprises nut (9) and is fixed on the guide pole (10) on the nut (9) and connects firmly liquid level sensor (13) on guide pole (10) that guide pole (10) passes the pilot hole on the bracing frame (6); Described balance device comprises counterbalance weight (12), wire rope (7) and pulley (8), and pulley (8) is fixed in the top of storage tank (15), and wire rope (7) one ends and nut (9) link, and the other end and counterbalance weight (12) link; Bracing frame (4) and bracing frame (6) are fixed on the inwall of storage tank (15), scrambler (1) connects firmly on motor (2) tailing axle, motor (2) and reductor (3) connect firmly on bracing frame (4), leading screw (11) upper end is connected with the output shaft of speed reduction unit (3), lower end and bracing frame (6) connect firmly, guide pole (10) is installed on the nut (9), and guide pole (10) is by the pilot hole guiding of bracing frame (6); Bracing frame (4), bracing frame (6) are installed on the inwall of storage tank (15); Motor (2), scrambler (1), be connected with controller with power line near the signal wire of switch (5), liquid level sensor (13).
2, electromechanical high-precision liquid level measurer according to claim 1 is characterized in that: described motor (2) is the motor of fire proof motor or stepper motor or tight device with lock.
3, electromechanical high-precision liquid level measurer according to claim 1 is characterized in that: the quantity that connects firmly the liquid level sensor (13) on guide pole (10) in the described sensor gearshift is 1-10.
4, electromechanical high-precision liquid level measurer according to claim 1 is characterized in that: described liquid level sensor (13) is a little differential pressure sensor.
CNA2008100197917A 2008-03-17 2008-03-17 Electromechanical high-precision liquid level measurer Pending CN101246029A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2008100197917A CN101246029A (en) 2008-03-17 2008-03-17 Electromechanical high-precision liquid level measurer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2008100197917A CN101246029A (en) 2008-03-17 2008-03-17 Electromechanical high-precision liquid level measurer

Publications (1)

Publication Number Publication Date
CN101246029A true CN101246029A (en) 2008-08-20

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102589650A (en) * 2011-12-23 2012-07-18 太原理工大学 Integrated measuring apparatus of liquid level and material level
CN103791983A (en) * 2014-01-29 2014-05-14 青岛澳邦量器有限责任公司 Liquid storage tank liquid level meter
CN109186718A (en) * 2018-09-27 2019-01-11 北京众信科源科技有限公司 A kind of water level sensor
CN113390489A (en) * 2021-04-28 2021-09-14 龙武 Dual-state adjustable probe for radar liquid level meter
CN114279390A (en) * 2021-12-07 2022-04-05 金陵科技学院 Iron ore underground material pit depth measuring device and working mode
CN114405138A (en) * 2021-12-21 2022-04-29 安徽工业大学 Novel static oil purifier

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102589650A (en) * 2011-12-23 2012-07-18 太原理工大学 Integrated measuring apparatus of liquid level and material level
CN103791983A (en) * 2014-01-29 2014-05-14 青岛澳邦量器有限责任公司 Liquid storage tank liquid level meter
CN109186718A (en) * 2018-09-27 2019-01-11 北京众信科源科技有限公司 A kind of water level sensor
CN113390489A (en) * 2021-04-28 2021-09-14 龙武 Dual-state adjustable probe for radar liquid level meter
CN114279390A (en) * 2021-12-07 2022-04-05 金陵科技学院 Iron ore underground material pit depth measuring device and working mode
CN114405138A (en) * 2021-12-21 2022-04-29 安徽工业大学 Novel static oil purifier
CN114405138B (en) * 2021-12-21 2023-04-11 安徽工业大学 Novel static oil purifier

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Open date: 20080820