CN103968806B - Liquid metal droplet electronic level gauge - Google Patents

Abstract

The invention relates to the field of measuring tools, and discloses a liquid metal liquid droplet electronic level, which includes an insulated airtight pipeline, which contains a non-electrolyte solution and a liquid metal droplet, and the liquid metal droplet forms a spherical structure in the non-electrolyte; The first resistance plate and the second resistance plate with different resistivities are arranged in parallel on the inner wall of the pipeline, and the two resistance plates are connected by liquid metal droplets; the first resistance plate and the second resistance plate are connected to the power supply to form a circuit loop; the signal processing device is set On the circuit, the electrical signal is acquired and analyzed to determine the offset of the droplet and thus the degree of leveling. The utility model has the advantages of simple structure, easy processing, accurate measurement results, intuitive display, low cost and easy integration. The volume change of the liquid metal droplet is not obvious when the temperature rises, which avoids the influence of the size of the bubble in the bubble level on the reading due to the continuous and stepless change of the resistance value, and can realize stepless measurement.

Description

Liquid Metal Droplet Electronic Level

technical field

The invention relates to the field of measuring tools, in particular to a liquid metal droplet electronic level.

Background technique

The level from the simple bubble level in the past to the current electronic level is the result of the development of automation and electronic measurement technology. As a detection tool, it has become an indispensable and important measurement tool in civil engineering, industrial automation, oil drilling, intelligent platform, machining and other fields. At present, the main types of levels are bubble levels, electronic levels, and digital levels.

There are two types of bubble levels commonly used: bar level and frame level. This type of spirit level uses the principle of constant level to directly display the angular displacement with the vial vial. The main part is the vial. With graduation line: After adjusting the spirit level, when the bottom surface of the base is level, the air bubble in the tube is in the middle of the tube. When the level is placed on the measured plane, the inclination of the plane can be determined from the deflection direction of the bubble. The bubble level is easy to operate, and the level can be directly observed, which can be used to roughly estimate the level. However, the movement of the bubble is difficult to distinguish with the naked eye, and it is also difficult to operate due to its high sensitivity. In addition, the size of the bubble will change with the ambient temperature. It leads to large errors in measurement; and the signal feedback and automatic adjustment functions cannot be realized.

Electronic level, it is used to measure high-precision machine tool, such as NC lathe, milling machine, cutting machine, three-dimensional measuring bed and other bed surfaces, and its sensitivity is very high. There are two main principles of electronic levels: inductive and capacitive. Inductive principle: When the base of the level is tilted due to the inclination of the workpiece to be measured, the voltage of the induction coil will change due to the movement of the internal pendulum. The measurement principle of the capacitive level is that a circular pendulum hangs freely on a thin wire. The pendulum is affected by the gravity of the center of the earth and is suspended in a friction-free state. There are electrodes on both sides of the pendulum and the capacitance is equal when the gap is the same. If the level is affected by the workpiece to be measured, the different distances between the two gaps will produce different capacitances and angle differences. This type of spirit level has high precision, but its structure is relatively complicated due to sensors and signal processing devices, and its cost is relatively high.

Digital Level Meter The digital level meter based on sensor, digital signal processing and single-chip microcomputer technology is the direction of digital development of current inclination testing instruments. The angle sensor is used to sense the horizontal inclination, and the inclination is directly displayed on the digital tube or uploaded to the computer for display and processing through signal processing and single-chip control and calculation, so that the angle measurement becomes convenient and fast, and the inclination angle is realized. high-precision measurement. However, the digital level still has complex structure and high cost.

Contents of the invention

(1) Technical problems to be solved

The purpose of the present invention is how to provide a level instrument with simple structure and accurate measurement.

(2) Technical solutions

In order to solve the above-mentioned technical problems, the present invention provides a liquid metal droplet electronic level, which includes: an insulated airtight pipeline containing a non-electrolyte solution and a liquid metal droplet; a first resistance plate and a second resistance plate with different resistivities; The first resistance plate and the second resistance plate are arranged in parallel on the inner wall of the insulated and airtight pipeline, and are connected through the liquid metal droplets; the circuit, the first resistance plate and the second resistance plate are connected to the circuit; the signal processing device, which Provided on said circuit, the electrical signal is acquired and analyzed to determine the extent of the level.

Wherein, the circuit includes a power supply and wires, and the two poles of the power supply are respectively connected to the first resistor and the second resistor by the wires.

Wherein, the first resistance plate is connected to the positive pole of the power supply, and the second resistance plate is connected to the negative pole of the power supply.

Wherein, the liquid metal droplet is liquid mercury, metallic gallium or a gallium-based alloy.

Wherein, the first resistor plate and the second resistor plate are straight chip resistors.

Wherein, the first resistance plate and the second resistance plate are made of non-metallic materials.

Wherein, the first resistance plate and the second resistance plate are embedded in the inner wall of the insulating and airtight pipeline.

Wherein, the first resistance plate and the second resistance plate are arranged at corresponding positions above and below the inner wall of the insulating and airtight pipeline.

(3) Beneficial effects

The liquid metal droplet electronic level provided by the invention comprises an insulated airtight pipeline containing a non-electrolyte solution and a liquid metal droplet, and the liquid metal droplet forms a spherical structure in the non-electrolyte; The first resistance plate and the second resistance plate are connected by liquid metal droplets; the first resistance plate and the second resistance plate are connected to the power supply to form a circuit loop; the signal processing device is set on the circuit to obtain and analyze An electrical signal that determines how level the spirit level is. When the insulated closed pipeline is not in a horizontal state, due to the action of gravity, the metal droplet will shift in the pipeline, and the resistance in the connected circuit will change. The position of the liquid metal droplet is determined by measuring the resistance value change in the circuit. To determine the degree of level. Its principle is similar to that of ordinary bubble levels. According to the principle of gravity, the position of liquid metal droplets changes with the level of the insulating and airtight pipeline; the signal processing device can convert the measurement results into digital signal output, which integrates the bubble level and electronic level. The utility model has the advantages of simple structure, easy processing, accurate measurement results, intuitive display and beneficial effects, and low manufacturing cost. The volume change of the liquid metal droplet is not obvious when the temperature rises or falls, which overcomes the problem that the size of the bubbles in the bubble level will affect the reading with the temperature change, and the measurement is accurate; due to the continuous and stepless change of the resistance value, the stepless measurement can be realized and the measurement result is accurate; At the same time, the radius of the insulating and airtight pipeline can be made very small, which is easy to integrate.

Description of drawings

Fig. 1 is the local transverse sectional view of liquid metal droplet electronic level of the present invention;

Fig. 2 is the longitudinal sectional view of the insulating and airtight pipeline of the liquid metal droplet electronic level of the present invention;

In the figure, 1: insulated and airtight pipeline; 2: first resistance plate; 3: second resistance plate; 4: liquid metal droplet; 5: power supply; 6: signal processing device; 7: wire.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

As shown in Figures 1 and 2, the liquid metal droplet electronic level of the present invention includes: an insulated airtight pipeline 1, and a non-electrolyte solution and a liquid metal droplet 4 are packaged in the insulated airtight pipeline 1, and the density of the liquid metal droplet 4 is the same as The density of the non-electrolyte solution is different, forming spherical structure droplets, which are in the insulated and airtight pipeline; the first resistance plate 2 and the second resistance plate 3 are arranged in parallel on the inner wall of the insulated and airtight pipeline 1, and the resistivity of the two resistance plates is different. The plates are connected by liquid metal droplets 4; the power supply 5, the first resistance plate 2 and the second resistance plate 3 are respectively connected to the two poles of the power supply 5 through wires 7 to form a circuit loop; the signal processing device 6 is arranged on the circuit , acquire and analyze the electrical signal, determine the offset of the droplet, and finally determine the level of the spirit level.

The principle of this level meter is: under the action of gravity, when the insulating and airtight pipe of the level meter is level, the liquid metal droplet is in the middle of the pipe, and the signal processing device obtains the corresponding electrical signal; The droplet is shifted under the action of gravity and moves to the relatively low places at both ends of the pipe. Since the resistivity of the first resistance plate and the second resistance plate are different, the resistance value connected to the circuit will increase with the offset. By analyzing the electrical signal, calculate the change of the resistance value in the access circuit, determine the offset of the liquid metal droplet in the insulated and closed pipeline, and finally determine the level of the level.

Further, preferably, the first resistance plate 2 is connected to the positive pole of the power supply 5 , and the second resistance plate 3 is connected to the negative pole of the power supply 5 . The connection between the power supply 5 and the two resistance plates can be selected at the same end of the two resistance plates, or can be connected at opposite ends, and it only needs to adjust the analysis basis of the signal analysis device accordingly.

Further, liquid metal droplets are preferably liquid mercury, metal gallium or gallium-based alloy droplets. The gallium metal alloy is preferably gallium indium alloy or gallium indium tin alloy.

Further, the first resistance plate 2 and the second resistance plate 3 are made of non-metallic materials with different resistivities, preferably carbon-based thin film resistance materials or metal oxide film resistance materials to make straight sheet resistance plates. Made of non-metallic materials can prevent liquid metal from corroding the resistance plate.

Further, the first resistance plate 2 and the second resistance plate 3 are fixed in parallel in the insulating airtight pipeline, preferably the resistance plate is embedded in the inner wall of the insulating airtight pipeline 1, so that the insulating airtight pipeline 1 is connected with the first resistance plate 2 and the second resistance plate 3 to form an integrated structure.

Further, it is preferable that the first resistance plate 2 and the second resistance plate 3 are arranged at corresponding upper and lower positions on the inner wall of the insulating and airtight pipeline 1 .

In the liquid metal droplet electronic level described in the above-mentioned embodiments, two resistors with different resistivities are connected to the circuit, and the two resistors are connected by liquid metal droplets, and the offset of the liquid metal droplets under the action of gravity is used. Characteristics, the resistance value in the connected circuit changes with the offset of the metal droplet, which causes the change of the electrical signal in the circuit, and the signal processing device determines the offset of the liquid metal droplet through the analysis of the electrical signal, so as to finally determine the level meter level of. The level meter determines the position of the liquid metal droplet by measuring the resistance value change in the circuit, so as to determine the level of the level meter. The principle of this spirit level is similar to that of the ordinary bubble level. Under the action of gravity, the position of the liquid metal droplet changes with the level of the insulating and airtight pipeline; the result can be converted into a digital signal output by using the signal processing device, and the air bubbles are collected. The advantages of the level meter and the electronic level meter are that it has the advantages of simple structure, easy processing, accurate measurement results, intuitive display, and low cost. The volume change of the liquid metal droplet is not obvious when the temperature rises or falls, which overcomes the problem of the influence of the bubble size on the reading with the temperature change in the bubble level meter, and the measurement is accurate; due to the continuous stepless change of the resistance value, the stepless measurement can be realized and the measurement accuracy can be improved. ; At the same time, the radius of the insulating airtight pipeline can be made very small, which is easy to integrate.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (8)

1. a liquid metal droplet electrolevel, including insulation closed conduit, the first resistance board, the second resistance board and circuit, it is characterised in that

Insulation closed conduit is built with non-electrolytic solution and liquid metal droplet；

First resistance board and the second resistance board resistivity are different, and described first resistance board and the second resistance board are set in parallel in insulation closed conduit inwall, are connected by described liquid metal droplet；

Described first resistance board and the second resistance board access in circuit；Also include:

Signal processing apparatus, it is arranged on described circuit, obtains the signal of telecommunication of also analysis circuit, it is determined that horizontality.

2. liquid metal droplet electrolevel as claimed in claim 1, it is characterised in that described circuit includes power supply and wire, and described two poles is connected with described first resistance and the second resistance with described wire respectively.

3. liquid metal droplet electrolevel as claimed in claim 2, it is characterised in that described first resistance board is connected with positive source, and described second resistance board is connected with power cathode.

4. liquid metal droplet electrolevel as claimed in claim 1, it is characterised in that described liquid metal droplet is liquid mercury, gallium or gallium-base alloy.

5. liquid metal droplet electrolevel as claimed in claim 1, it is characterised in that described first resistance board and the second resistance board are straight type pellet resistance.

6. liquid metal droplet electrolevel as claimed in claim 1, it is characterised in that described first resistance board and the second resistance board are made up of nonmetallic materials.

7. liquid metal droplet electrolevel as claimed in claim 1, it is characterised in that described first resistance board and the second resistance board embed in described insulation closed conduit inwall.

8. the liquid metal droplet electrolevel as described in any one of claim 1 to 7, it is characterised in that described first resistance board and the second resistance board are located at the position of described insulation closed conduit inwall upper and lower corresponding.