CN2216247Y

CN2216247Y - Liquid specific gravity real time measurer

Info

Publication number: CN2216247Y
Application number: CN 92232590
Authority: CN
Inventors: 杜安棣
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-10
Filing date: 1992-09-10
Publication date: 1995-12-27
Anticipated expiration: 2002-09-10

Abstract

The utility model relates to a liquid specific gravity real time measurer, which uses a force sensor to measure buoyancy. The liquid specific gravity real time measurer realizes the specific gravity real time measure for liquid (especially mixed liquid) on industrial production lines. The utility model has the advantages of simple and reliable method and simple device; on-site calibration is easy to realize; accuracy can be up 0.1%; the liquid specific gravity real time measurer can be widely used for monitoring and controlling slurry specific gravity, ore slurry specific gravity, dielectric specific gravity, paper pulp specific gravity, physic liquid specific gravity, and other solution specific gravity in online.

Description

Liquid specific gravity real time measurer

The utility model has provided with the tintometric device of force sensor measuring and has realized tintometric real-time measurement on the industrial production line.

Present Chinese liquid specific density measurement great majority are still continued to use ancient glass envelope picnometer and are finished.The SU-893 intelligence Fibre Optical Sensor concentration tester of New Tech. Research Centre, Shenzhen Univ.'s exploitation that 1992 the 4th phase P8 of " the new product world " the magazine page or leaf that sino-america joint-venture is published is delivered, be different according to the concentration difference of solution to the absorption of light with Fibre Optical Sensor, by Fibre Optical Sensor the variation of light signal is changed into electric signal output, and then signal is handled.This method has solved the specific gravity test of solution by solution concentration indirect calculation proportion.But the proportion to two-phase flow, mixed liquor then can't be measured.Use is the liquid level place that is installed in differing heights with two pressure transducers at the device of php slurry specific gravity test, realizes on-the-spot proportion monitoring with the way of pressure measurement difference.The problem of this method is that sensor must contact with measured object, and therefore the material technology to sensor requires height, and measuring accuracy is lower, restricted application, both on-site provings troubles.

The purpose of this invention is to provide the measurement mechanism that can be widely used in on-line measurement liquid on the production line (especially mixed liquor) proportion.

In order to achieve the above object, the technical solution adopted in the utility model is: according to Archimedes principle, survey the method monitoring liquid proportion of liquid buoyancy with force transducer.The specific design of device is: with a doubly-linked hole (or twin beams, five beams) strain force sensor is fixed on the base plate that through hole (or groove) arranged, the hole of passing on the base plate (or groove) is connected a special-purpose weight with soft rope (or stiff rod) with force transducer, make the force transducer cantilever force.The material of weight and shape can be selected according to the concrete condition of fluid to be measured, satisfy weight proportion＞test solution proportion.Weight all is immersed in the liquid, and the suffered buoyancy of object is passed to force transducer by power transmission thing (soft rope or stiff rod).The buoyancy of object also changed when liquid specific gravity changed, and force transducer converts the buoyancy that receives to electric signal output, carried out numeral demonstration and further processing by secondary instrument.Can also be on special-purpose object encapsulation temperature sensor so that the temperature of liquid is carried out synchro measure.

Use the utility model has the advantages that:

1. make liquid (solution or mixed liquor) but the proportion online in real time measure, and device is simple.

2. the precision height is applied widely.

3. on-site proving is convenient.

Below in conjunction with accompanying drawing example of the present utility model is further described:

Fig. 1 is the elevation cross-sectional view of this device embodiment, and Fig. 2 is a right view, and Fig. 3 is the block scheme of secondary instrument.(1) be elastic body, (2) are base plates, and (3) are steel wires, and (4) are heavy ball, (5) be shell, (6) are zero potentiometers, and (7) are sockets, (8) be the full scale pot, (9) are prime amplifiers, and (10) are that foil gauge (or semiconductor gauge) (11) is a link.Stick resistance strain gage (or semiconductor gauge) (10) in the doubly-linked hole on (or twin beams, five beams) formula power elastic body (1), it is formed electric bridge becomes force transducer.To be screwed behind the force sensor caliberating on a sheet metal (2) that has hole (or groove).With heavy ball (4) (material can be chosen wantonly, shape can arbitrarily) but should guarantee its whole proportion＞fluid to be measured proportion.

With steel wire (nylon rope, mfg. metal cord, other hawser or bar) (3) be connected with force transducer (can be to be flexible coupling, also can be hard connection) make the force transducer cantilever force.In housing (5), load onto prime amplifier (9) and zeroing, the pot (6) of transferring full scale, (8) (this amplifier and two visual field conditions of pot are contained in the primary instrument, also can be contained in the secondary instrument).

To install fixed placement links with digital display meter in air.Regulate zero potentiometer to 0, then heavy ball is immersed in the water fully, regulate full scale pot to 1.Finish and device can be contained in the appropriate location that needs the liquid production line that detects after the adjusting, heavy ball is immersed in the liquid, and (liquid specific gravity is carried out temperature survey and handles and temperature sensor can be encapsulated on the link (11) as need) links sensor output with secondary instrument.

With after heavy ball is connected, be transferred to 0 with zero potentiometer and think that promptly force transducer is steady state (SS) (original state) at this moment this moment by the deadweight of the suffered heavy ball of force transducer in air for force transducer.According to Archimedes' principle as can be known: when object was immersed in the liquid, its suffered buoyancy was the weight of its institute's discharged liquid:

Q＝d·V P＝P’－ Q

Q represents buoyancy, and d represents liquor ratio heavy, and V represents the volume of object, the power that the P representative sensor is suffered, and P ' represents the deadweight of heavy ball.

Object is immersed in the liquid, because the suffered power of force transducer that exists of buoyancy changes, to reduce, owing to the deadweight of sensor suffered heavy ball in air is set to zero, power when therefore heavy ball is immersed in the water after the suffered variation of force transducer (in the digital display meter shown value) is suffered buoyancy size, owing to the shape of heavy ball, size is fixed again, and volume just is fixed number.The size of buoyancy changes with the d of liquid at this moment, because the proportion of water is 1, the full scale pot is transferred to 1.This moment, the demonstration of digital display meter was just set up relation with the proportion of liquid.The demonstration of digital display meter is exactly the proportion of this liquid when heavy ball is immersed in other liquid.When the proportion of liquid changed, the numerical value of digital display meter was also incited somebody to action linear change thereupon.

Find out that by Fig. 1 the given embodiment device of the utility model is simple, with low cost, be easy to realize." the liquid specific gravity monitor-I type " made according to this scheme has demonstration, timed print function, there is the binary-coded decimal delivery outlet further to control with microcomputer is online, its specific gravity test precision reaches 0.1%, the II type also is packaged with temperature sensor on weight except that above function is arranged, but synchro measure fluid temperature and handling.

Mud balance monitoring when this device can be widely used in oil drilling, the ore pulp proportion monitoring in the ore-dressing technique, the monitoring of dielectric proportion, the monitoring of paper pulp proportion, herb liquid proportion monitoring etc.

Claims

A kind of with the tintometric device of force sensor measuring, it is characterized by: a doubly-linked cellular type, many beam types adaptability to changes sensor are fixed on the base plate of a through hole that arbitrary shape arranged, pass hole on this base plate with soft rope, stiff rod, a special-purpose weight is linked to each other with force transducer, make the force transducer cantilever force; And make whole being immersed in the liquid of ratio Beijing South Maxpower Technology Co. Ltd of the proportion＞fluid to be measured of special-purpose weight, force transducer has the full current potential of prime amplifier, zero potentiometer and accent.