CN201298007Y

CN201298007Y - Densimeter

Info

Publication number: CN201298007Y
Application number: CNU2008201685468U
Authority: CN
Inventors: 陶星辰; 王洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-01
Filing date: 2008-12-01
Publication date: 2009-08-26
Anticipated expiration: 2018-12-01

Abstract

The utility model discloses a densimeter comprising an electronic balance circuit, a strain sensor and a lever, wherein the lever is arranged below the strain sensor, and the middle of the lever is provided with a point extended on the strain sensor; a motor and a screw rod are arranged on the lever; a hanging rope for hanging an object is hung on a screw thread of the screw rod and can move left and right along with the movement of the screw thread when the screw rod rotates. When the densimeter is used, the reading data of an electronic balance is one through adjusting the hanging point of the object, then the object is dipped into water, the obtained result is the weight ratio of the object in water and in the air, and finally the density value of the object is obtained through comparing with the detected result and the precalculated weight ratio of various materials in water and in the air. The densimeter is simpler to measure because the weight of the object in the air is not needed to be measured.

Description

A kind of densitometer

Technical field

The utility model relates to electronic measuring instrument, particularly to the improvement of solid body densitometer.

Background technology

At present, measure the density of solid,, need determine quality and these two numerical value of volume of object, calculate then, obtain the density of object according to formula: ρ=m/v.

The measurement quality is fairly simple, weighs with scale.

And measurement volumes need be immersed in object in the water of measuring cup, and the rising value and the former water level value of water level subtracted each other, and draws volume.In this link, because the surface tension effects of water, there is depression at the liquid level edge, is not to be a clearly line, therefore by visual can't pin-point reading, cause error.

Also to calculate at last, cumbersome.

In order to overcome the problems referred to above, make and measure simply accurately, on the market a kind of electronic densitometer (picnometer) has appearred now.It is to record the aerial weight of object (dry weight) earlier, records object again and is immersed in weight (weight in wet base) in the pure water that density is 1Kg/L.

According to the numerical value of dry weight and weight in wet base,, calculate the density of the object of surveying by built-in computer single-chip microcomputer computing.

This device is similar to electronic balance, and pallet is placed in the container, can add water in the trend container by built-in water pump.In addition, be provided with computer in the device, in order to result of calculation.

Its shortcoming is that whole apparatus structure more complicated, volume are bigger, and the circuit complexity, and cost is very high.And this device volume is big, is unfavorable for that geologic prospecting, archaeology are analyzed, carries during to metal purity and true and false outdoor studies such as differentiation when the evaluation operation during the jade exploitation, buying thing.

Summary of the invention

The utility model purpose be to provide a kind of simple in structure, volume is little, portative densitometer, use with convenient.

Scheme of the present utility model is: a kind of densitometer, comprise the electronic scale circuit, strain transducer, lever, strain transducer and electronic scale circuit are electrically connected, it is characterized in that: a lever is set below strain transducer, one end of lever is hinged on hinge on the fixed head of strain transducer as fulcrum, the centre has a point to be pulled on the force side of strain transducer by hook, motor and screw mandrel are housed on the lever, the rotating shaft of screw mandrel and motor is connected, and it is parallel with lever, on the screw thread of screw mandrel, hang with the lanyard that is used to hang object, lanyard can be when screw mandrel rotates with the motion of screw thread move left and right.

The utility model has the advantages that: during use, object is hung on the lever, another arm of force of lever acts on the electronic scale, by regulating the hitch point of object, making the electronic scale reading is 1, object is immersed in the water again, and the result who draws is exactly the ratio of weight in weight and the air in the object water, in testing result and the water that calculates good various materials in advance in weight and the air ratio of weight compare, thereby obtain the density value of object.Owing to do not need to measure object weight in air, make that measurement is simpler.Adopt strain transducer and measure numerical value, have good linearity, the advantage that degree of accuracy is high by the lever adjustment.

Description of drawings

The utility model is described in further detail with embodiment with reference to the accompanying drawings below.

Accompanying drawing is the structural representation of the densitometric Sensor section of the utility model.

Mark among the figure: 1 fixed screw, 2 strain transducers, 3 sensor fixation plates, 4 levers, 5 lanyards, 6 testees, 7 screw mandrels, 8 drag hooks, 9 motors, 10 hinges.

Embodiment

The foundation of embodiment method is:

In water, because the ratio that the big suffered buoyancy of object of density accounts in gravity is little, and the ratio that the little suffered buoyancy of object of density accounts in gravity is big, and is little such as the difference of weight in weight and the air in the water of gold, in the water of plastics in weight and the air weight difference big.

We are according to above-mentioned principle, and the ratio by weight (dry weight) in weight (weight in wet base) and the air in the mensuration object water draws the relevant information of object density indirectly.

Be appreciated that this principle with following formula:

G _Wet/ G _Do=(G _Do-F _Buoyancy)/G _Do=(ρ V-ρ _WaterV)/ρ V

＝(ρ-1)/ρ

In the formula:

G _WetThe weight in wet base of object (soaking in water) G does _ThingThe dry weight of body (in the air)

F _BuoyancyThe proportion (density) of the buoyancy ρ object of object in water

The volume ρ of V object _WaterThe proportion of water (density)

The result who records according to this principle is the ratio of object weight in wet base and dry weight, and only the density with object is relevant for it, such as:

Material density (ρ-1)/ρ numerical value

Au 19.3 0.948

Al 2.70 0.630

Cr 7.20 0.861

Cu 8.92 0.888

Fe 7.86 0.873

Mg 1.74 0.425

Pb 11.34 0.912

Calculate good relevant data in advance, testing result can obtain the density information of object in contrast.

The densitometer of embodiment, comprise electronic scale circuit, strain transducer, lever, its structure is: a lever 4 is set below strain transducer 2, one end of lever 4 is hinged on the strain transducer fixed head 3 as fulcrum with hinge 10, the centre of lever 4 has a point to be pulled on the force side of strain transducer 2 by linking up with 8, and the power of lever 4 just acts on strain transducer 2 like this.

Motor 9 and screw mandrel 7 are housed on the lever 4, and they all are contained in the below of lever 4, and screw mandrel 7 is connected with the rotating shaft of motor 9, and parallel with lever 4, and the rotation of motor 9 can drive screw mandrel 7 and rotate.

Hang with the lanyard 5 that is used to hang object on the screw thread of screw mandrel 7, lanyard 5 adopts the cord of lightweights, and quality own is little of can ignoring, lanyard 5 can be when screw mandrel 7 rotations with the motion of screw thread move left and right.

When testee 6 is hung diverse location on screw mandrel 7, amount of force on strain transducer 2 promptly with object from the stress point of strain transducer 2 promptly link up with 8 relevant apart from length, therefore, can drive the size that sling point that screw mandrels 7 move lanyard 5 is adjusted this acting force arbitrarily by motor 9 no matter its weight size how.

No matter the weight size of testee 6, earlier by above-mentioned means, the reading that the electronic scale circuit is shown is adjusted to 1.000 (or 10.00 or 100.0) in proportion, and after object was immersed in the water, because denominator is 1, then the reading of Xian Shiing promptly was G so _Wet/ G _Do, avoided the trouble of calculating.

Such as the iron block of one tens grammes per square metre, when surveying dry weight earlier, we the reading on the electronic balance can be adjusted to 100.0 in proportion; And the iron block of several grammes per square metres, we can adjust to 10.00.Because the result be (ρ-1)/ρ, have nothing to do with weight, be immersed in the water so after, the reading of demonstration is 0.873.

Claims

A kind of densitometer, comprise the electronic scale circuit, strain transducer, lever, strain transducer and electronic scale circuit are electrically connected, it is characterized in that: a lever (4) is set in strain transducer (2) below, one end of lever (4) is hinged on strain transducer fixed head (3) with hinge (10) and goes up as fulcrum, the centre has a point to be pulled on the force side of strain transducer (2) by hook (8), motor (9) and screw mandrel (7) are housed on the lever (4), screw mandrel (7) is connected with the rotating shaft of motor (9), and it is parallel with lever (4), on the screw thread of screw mandrel (7), hang with the lanyard (5) that is used to hang object, lanyard (5) can be when screw mandrel (7) rotates with the motion of screw thread move left and right.