CN203929561U - Portable Solid Density Meter - Google Patents

Abstract

The utility model discloses a kind of by detecting the variation of quality in fixed container, indirectly record the big or small Portable solid penetron of solid matter volume, solid matter container and the airtight water container being communicated with by flexible conduit by being equipped with on container cushion cap, the first LOAD CELLS is equipped with in solid matter container bottom, the second LOAD CELLS is equipped with in airtight water container bottom, and the first LOAD CELLS and the second LOAD CELLS connect and compose with metering circuit respectively.Remarkable advantage is to survey in extensive range, can be greater than 1g/cm to density ³and the density of solid matter not soluble in water is measured, greatly improved measuring accuracy.In the metering circuit of gravity, adopt the integrated circuit of amplification and analog to digital conversion one, this device is once completed on measuring, avoided repeatedly measuring the error accumulation causing.

Description

Portable Solid Density Meter

technical field

The utility model relates to a density measuring device for a solid solid material with an arbitrary shape, in particular for measuring the density of a solid material with a density less than 1g/cm ³ . Specifically, load cells and data acquisition and data processing technologies are used to measure the density of solid substances such as ores.

Background technique

Density is a very important physical quantity, and it has important utilization value in many fields. There are many measurement methods for measuring the density of solid substances, such as radioactive principle measurement method, microwave technology measurement method and Archimedes measurement method. The most commonly used method is the Archimedes indirect measurement method, but most of the densitometers manufactured based on this principle are inconvenient to carry and inconvenient to measure.

According to the density calculation formula: , the key is to accurately measure the mass and volume of solid matter. For the determination of solid mass, it can be measured by the weighing sensor currently on the market, but for the volume of irregular solid matter, it cannot be directly measured, and the method of directly draining liquid is generally used for measurement. And the disclosed air pumping method density measuring instrument of CN2533465Y, because structure is complicated, can not realize portable measurement. Therefore, it can only be limited to laboratory measurements. The high-precision density detector disclosed by CN2293826Y needs weighing devices such as trays and weights, does not have the characteristics of portability, and needs vernier readings, and does not have the advantage of digital display. A paper entitled "Intelligent Density Detector" published in the Journal of Physical Experiments has adopted the same sensor and A/D module as the utility model, but due to the difference in measurement principles, the volume of the measuring instrument described in this paper Large, still inconvenient to carry, and only suitable for laboratory measurements.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a portable solid density measuring instrument.

The purpose of this utility model is achieved by the following technical solutions:

The portable solid density measuring instrument is equipped with a solid matter holding container 1 and a closed water holding container 2 on the container platform. A first load cell 4 is installed at the bottom of the container 1, and a second load cell 5 is installed at the bottom of the airtight water container 2, and the first load cell 4 and the second load cell 5 are respectively connected to a measuring circuit 13 to form a structure.

The measurement circuit 13 is composed of the first load cell 4 and the second load cell 5 respectively connected to the keyboard 10 and the liquid crystal display 9 through the amplifier circuit 6, the A/D conversion circuit 7 and the minimum system 8 of the single chip microcomputer. The output signals of the two load cells are connected to the measurement circuit for data acquisition and processing.

Beneficial effect:

The utility model discloses a device for indirectly measuring the volume of a solid substance by detecting the change of the mass in a fixed container, and then obtaining the density of the solid substance to be measured. The notable advantage of the device is that it can measure a wide range, and can measure the density of solid substances with a density greater than 1g/cm ³ and not easily soluble in water, which greatly improves the measurement accuracy. Moreover, the purpose of the load cell is to measure the difference in quality, so as not to cause errors due to the difference in the quality of the water in the two containers. An integrated circuit integrating amplification and analog-to-digital conversion is used in the gravity measurement circuit. The device completes the measurement once, avoiding error accumulation caused by multiple measurements.

Description of drawings

Accompanying drawing 1 is the device structural diagram of portable solid density measuring instrument

Accompanying drawing 2 is the overall system block diagram of accompanying drawing 1

1 container for solid matter, 2 airtight water container, 3 flexible conduit, 4 the first load cell, 5 the second load cell, 6 amplifier circuit, 7A/D conversion circuit, 8 the smallest single-chip system, 9 liquid crystal display LCD , 10 keyboard, 11HX711 load cell dedicated module, 12 is the measured object, 13 is the measurement circuit.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

The portable solid density measuring instrument is equipped with a solid matter holding container 1 and a closed water holding container 2 connected by a flexible conduit 3 on the container platform. The bottom of the solid matter holding container 1 is equipped with a first load cell 4. The bottom of the water container 2 is equipped with a second load cell 5 , and the first load cell 4 and the second load cell 5 are respectively connected to the measurement circuit 13 to form.

The measurement circuit 13 is composed of the first load cell 4 and the second load cell 5 respectively connected to the keyboard 10 and the liquid crystal display 9 through the amplifier circuit 6, the A/D conversion circuit 7 and the minimum system 8 of the single chip microcomputer. The output signals of the two load cells are connected to the measurement circuit for data acquisition and processing.

The physical quantity of density is defined as the ratio of mass m to volume v, so the physical quantity that needs to be measured is the mass m and volume v of the object to be measured, and the determination of mass m can be achieved with a high-precision load cell . As shown in Figure 1, before the object to be tested is put into the container 1, press the start key on the keyboard 10 to perform the initial measurement. At this time, the mass measured by the first load cell is recorded as m ₁ , and the second weigh The mass measured by the sensor is recorded as m ₂ ; then put the measured object in the container 1, the object to be measured sinks to the bottom of the container, press the end button on the keyboard 10, then the mass measured by the first load cell at this time denoted as _m ′ ₁ , the second weighing

The mass measured by the sensor is denoted as m′ ₂ , given by the formula (4) The density of the measured object can be calculated.

The measurement circuit 13 is composed of a dedicated A/D module 11 for a load cell HX711, a minimum system 8 of a single-chip microcomputer, a display 9 and a keyboard 10. Among them, the HX711 module 11 integrates the amplifier circuit 6 and the up to 24-bit A/D conversion circuit 7, which greatly improves the measurement accuracy.

The utility model has used two sensors, and one is the first load cell 4 that is used to measure container 1 mass variation, and the other is the load cell 5 that is used to measure the quality of water in airtight water holding container 2. When no object is placed in the container 1, the mass of the container 1 and the water contained in the container 1 measured by the first load cell 4 is m ₁ , and the mass of the container 2 and the water contained in the container 2 measured by the second load cell 5 is m 1 . The mass of water is m ₂ ; after the object to be tested is put into the container 1, the mass of the container 1 and its own water and the object to be measured measured by the first load cell is m ₁ ', and the mass measured by the second load cell If the mass of container 2 and the water contained in it is m′ ₂ , then the mass of the measured object is:

M=(m' ₁ -m ₁ )+(m' ₂ -m ₂ )=Δm ₁ +Δm ₂

(1)

According to the principle of the connecting device, the volume of water added in container 2 is the same as the volume of the rising liquid level in container 1, so the volume of the measured object is:

The density of the measured object obtained from formulas (1) and (2) is:

Since the density of water is known to be 1g/cm ³ , formula (3) can be simplified as:

It can be seen from the formula (4) that the density of the measured object can be obtained by measuring the mass change of the two containers before and after the measured object is put into the two load cells.

Claims (2)

1. A portable solid density measuring instrument is characterized in that, a solid matter holding container (1) and an airtight water holding container (2) are housed on the container platform, and the solid matter holding container (1) and the airtight water holding container The containers (2) are communicated through soft conduits (3), the bottom of the solid matter storage container (1) is equipped with a first load cell (4), and the bottom of the airtight water container (2) is equipped with a second load cell ( 5), the first load cell (4) and the second load cell (5) are respectively connected to the measuring circuit (13) to constitute. 2. according to the described portable solid density measuring instrument of claim 1, it is characterized in that, measuring circuit (13) is respectively through amplifying circuit (6) by the first load cell (4) and the second load cell (5). , the A/D conversion circuit (7) and the minimum system of the single chip microcomputer (8) are respectively connected with the keyboard (10) and the liquid crystal display (9) to form.