CN204649985U - A kind of mining focusing dual-frequency IP instrument isolation sampling and control system - Google Patents

Abstract

The utility model discloses an isolated sampling and control system for a mine-used focusing dual-frequency IP instrument, which is characterized in that it consists of a single-chip microcomputer, an analog-to-digital converter, a digital-to-analog converter, a voltage isolation sampling circuit, a current isolation sampling circuit, a voltage isolation Composed of control circuit, constant current output circuit, front-end isolated power supply and rear-end isolated power supply, the single-chip microcomputer generates digital control signals, which are converted into analog quantities by a digital-to-analog converter, and are generated by the constant-current output circuit after isolation and output by the voltage isolation control circuit. Stable and adjustable current, the output voltage and current are isolated and sampled by the voltage isolation sampling circuit and the current isolation sampling circuit respectively, converted into digital quantities by the analog-to-digital converter, and then collected and processed by the single-chip microcomputer, the isolated front-end circuit and the back-end circuit are respectively controlled by the front-end isolated power supply And back-end isolated power supply. The utility model can realize the high-precision control and voltage and current detection of the constant current output circuit.

Description

A Mine-used Focused Dual-frequency IP Instrument Isolation Sampling and Control System

technical field

The utility model relates to an isolated sampling and control system of an electrical prospecting instrument, in particular to an isolated sampling and control system of a mine-used focusing dual-frequency IP instrument launching device.

Background technique

In order to ensure the safe production of personnel and machines in the coal mine working face, the principle of "forecasting and forecasting, all digging must be explored, first explored and then excavated, and first treated before mining" must be followed during the excavation process. With the continuous development of mining mechanization level in our country, the requirements for detection technology of fully mechanized excavation working face are getting higher and higher. At present, the advanced detection methods commonly used in underground coal mines mainly include: mine direct current method, mine transient electromagnetic method, mine geological radar detection method, Rayleigh wave method and mine seismic wave method and other detection technologies. These geophysical prospecting methods have outstanding problems such as low detection accuracy, poor real-time performance, poor directionality, low efficiency, high cost, poor anti-interference ability, and excavation separation, which cannot fully meet the requirements of advanced detection for excavation. Therefore, it is of great significance to study an advanced detection method with simple working method, high detection accuracy, and cooperative operation with roadheaders.

Focused dual-frequency IP method detection technology (patent number CN103176214A) is a new method for advanced detection of coal roadways based on dual IP method and electric field focusing deflection effect proposed by China University of Mining and Technology (Beijing). According to the principle of the focused dual-frequency IP method, a mine-used focused dual-frequency IP device was developed. The instrument consists of two parts, the transmitting device and the receiving device. The transmitting device transmits a single-channel modulated square wave current with the same amplitude and high and low frequency combination to the front of the tunneling section through the main electrode (arranged at the center of the tunneling section) as the excitation, and the constraining electrodes (symmetrically arranged Around the main electrode) four channels of modulated square wave currents with the same polarity as the main electrode and adjustable amplitude strength are used as constraints, and the restraint effect of the electric field is used to effectively control the propagation direction and distance of the detection electric field, so that a certain distance in front of the roadway section The azimuthal surrounding rock medium produces different degrees of induced polarization. The induced polarization potential difference is detected by the receiving device, and the apparent frequency and apparent resistivity of the induced electrical parameters are calculated to realize the geological anomalies (including water, faults and collapsed columns) in front of the roadway section. Geological structure, etc.) accurate judgment of the orientation to achieve the purpose of fixed direction and fixed distance detection; by changing the constrained direction and amplitude of the emission current of the confinement electrode, the angle and depth scanning detection can be realized, that is, the electric field focusing deflection effect.

In order to realize the focus deflection effect of the detection electric field, the transmitter device of the detector is required to output a single-channel amplitude-controllable, five-channel mutually isolated dual-frequency modulated square wave current; in order to realize accurate detection of the voltage and current of each channel of the transmitting electrode and the restraining electrode, At the same time, it is necessary to conduct high-precision isolated sampling of the output voltage and current values of the detector transmitter.

Utility model content

The purpose of this utility model is to solve the problem of isolation control of emission current and isolation sampling of voltage and current in the launch device of the mine-used focusing dual-frequency IP instrument, so as to realize the single-channel amplitude controllable and 4-channel mutual isolation of the detector output Dual-frequency modulation of square wave current, and high-precision isolated sampling of output voltage and current values of each channel at the same time.

The utility model is achieved through the following technical solutions:

A mine-used focused dual-frequency IP instrument isolation sampling and control system is characterized in that it consists of a single-chip microcomputer, an analog-to-digital converter, a digital-to-analog converter, a voltage isolation sampling circuit, a current isolation sampling circuit, a voltage isolation control circuit, a constant current Output circuit, front-end isolated power supply and rear-end isolated power supply. The single-chip microcomputer generates digital control signals, which are converted into analog quantities by a digital-to-analog converter. After isolation and output by the voltage isolation control circuit, the constant current output circuit is controlled to generate a stable and adjustable current. The output voltage and current are isolated and sampled by the voltage isolation sampling circuit and the current isolation sampling circuit respectively. After being converted into digital quantities by the analog-to-digital converter, they are collected and processed by the single-chip microcomputer. powered by.

Compared with the prior art, the isolation sampling and control system of the mining focusing dual-frequency IP instrument of the utility model has the following beneficial effects:

(1) The front-end and back-end circuits are isolated from each other and the back-end circuits are isolated from each other, which solves the technical problem of single-channel controllable and 5-channel mutual isolation of the detector output.

(2) The linear optocoupler isolation technology is adopted to solve the technical problems of high-precision isolation control of the emission current of each channel of the mining focused dual-frequency IP instrument and high-precision isolation sampling of voltage and current.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the circuit diagram of the front-end isolated power supply and the rear-end isolated power supply of the utility model;

Fig. 3 is the circuit diagram of the utility model voltage isolation sampling and current isolation sampling circuit;

Fig. 4 is a circuit diagram of the voltage isolation control circuit of the utility model.

Among them, 1. Single-chip microcomputer, 2. Analog-to-digital converter, 3. Digital-to-analog converter, 4. Voltage isolation sampling circuit, 5. Current isolation sampling circuit, 6. Voltage isolation control circuit, 7. Constant current output circuit, 8. Front-end isolated power supply, 9. Back-end isolated power supply.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand and understand, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. This embodiment shall not be used to explain the limitation of the protection scope of the present utility model.

See Figure 1

The isolated sampling and control system of the mine-used focusing dual-frequency IP instrument described in the present embodiment is characterized in that it consists of a single-chip microcomputer (1), an analog-to-digital converter (2), a digital-to-analog converter (3), and a voltage isolation sampling circuit (4), current isolation sampling circuit (5), voltage isolation control circuit (6), constant current output circuit (7), front-end isolated power supply (8) and rear-end isolated power supply (9), the single-chip microcomputer (1) A digital control signal is generated, which is converted into an analog quantity by a digital-to-analog converter (3), and is isolated and output by a voltage isolation control circuit (6) to control a constant current output circuit (7) to generate a stable and adjustable current. The output voltage and current are respectively passed through the voltage The isolated sampling circuit (4) and the current isolated sampling circuit (5) are isolated and sampled, converted into digital quantities by the analog-to-digital converter (2) and then collected and processed by the single-chip microcomputer (1). The isolated front-end circuit and the back-end circuit are respectively controlled by the front-end isolated power supply (8) and back-end isolated power supply (9) supply power.

See Figure 2

The front-end isolated power supply (8) and the back-end isolated power supply (9) both use the isolated power supply module A0515S-1W of Guangzhou Jinshengyang Company. The voltage supplies power to the back-end circuit. The function of the input diode D7 is to prevent reverse connection of the power supply. The resistor R10 is a 0.5A self-recovery fuse, which is used for over-current protection.

See Figure 3

The voltage isolation sampling circuit (4) has the same circuit structure as the current isolation sampling circuit (5), and is composed of an instrumentation amplifier AD620, an operational amplifier OP07, and a linear optocoupler HCNR201. The instrumentation amplifier measures the sampling resistance of the constant current output circuit (7). The voltage signal at both ends of the signal is converted into a single-ended signal, which is linearly isolated by a high-precision isolation amplifier composed of a linear optocoupler HCNR201, and finally sampled by an analog-to-digital converter (2).

See Figure 4

The voltage isolation control circuit (6) is composed of an operational amplifier and a linear optocoupler circuit, etc., and the digital-to-analog converter (3) converts the digital control signal into an analog control quantity, and the analog control signal is passed through a high voltage circuit composed of a linear optocoupler HCNR201. The linear isolation of the precision isolation amplifier realizes the control of the output current value of the constant current output circuit (7).

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the claims and their equivalents.

Claims (2)

1. A mine-used focusing dual-frequency IP instrument isolation sampling and control system is characterized in that, by single-chip microcomputer, analog-to-digital converter, digital-to-analog converter, voltage isolation sampling circuit, current isolation sampling circuit, voltage isolation control circuit, Composed of constant current output circuit, front-end isolated power supply and rear-end isolated power supply, the single-chip microcomputer generates digital control signals, which are converted into analog quantities by digital-to-analog converters, and the constant-current output circuit is controlled by the voltage isolation control circuit to generate stable and adjustable output after isolation and output. The current, output voltage and current are isolated and sampled by the voltage isolation sampling circuit and the current isolation sampling circuit respectively. After being converted into digital quantities by the analog-to-digital converter, they are collected and processed by the single-chip microcomputer. Isolated power supply. 2. The isolated sampling and control system of the mine-used focusing dual-frequency IP device according to claim 1, wherein the voltage isolation sampling circuit, the current isolation sampling circuit, and the voltage isolation control circuit all adopt high-precision isolation amplifiers.