CN114991751A - Underground mining area magnetic ore body occurrence state is along with boring real-time detection device - Google Patents

Abstract

The invention discloses a device for detecting occurrence states of magnetic ore bodies in underground mining areas in real time while drilling, and relates to the field of underground mining of metal ore deposits, wherein the device for detecting the magnetic ore bodies comprises: the ore pulp collecting tray, the coil sensor and the data measuring and processing instrument; the ore pulp collecting tray is used for collecting ore pulp flowing from a drill bit of the drill jumbo along the drill rod; the coil sensor detects the voltage of ore pulp flowing to obtain the sensor voltage; the data measurement processor is connected with the coil sensor; the data measurement processor calculates the inductance value of the coil sensor according to the sensor voltage so as to determine the content of the magnetic minerals in the ore pulp; the drilling monitoring system measures the drilling displacement and the drilling torque of the drill rod, calculates the advancing speed of the drill rod according to the relation between the drilling displacement and the time, and determines the occurrence state of the target ore body according to the advancing speed of the drill rod and the drilling torque. The invention can monitor the content and occurrence state of the magnetic mineral in real time on site, reduce time cost and improve the accuracy of measurement.

Description

A real-time detection device while drilling for the occurrence state of magnetic ore bodies in underground mining areas

technical field

The invention relates to the field of underground mining of metal ore deposits, in particular to a real-time detection device while drilling for the occurrence state of magnetic ore bodies in an underground mining area.

Background technique

At present, the exploration of non-ferrous metal ore bodies often requires on-site rock drilling and coring, and after collecting a large amount of cores, they are transported back to the testing center for offline testing. The guidance greatly extended the construction period, and the effect was worse than in-situ detection, which brought a lot of uncertainty to the site.

SUMMARY OF THE INVENTION

Based on this, embodiments of the present invention provide a real-time detection device while drilling for the occurrence state of magnetic ore bodies in an underground mining area, so as to monitor the content and occurrence state of magnetic minerals in real time on site, reduce time costs, and improve measurement accuracy.

For achieving the above object, the present invention provides the following scheme:

A real-time detection device while drilling for the occurrence state of magnetic ore bodies in an underground mining area, comprising: a magnetic mineral detection device and a borehole monitoring system; the magnetic mineral detection device includes: a pulp collection tray, a coil sensor and a data measurement and processing instrument;

The ore slurry collection tray is sleeved on the drill pipe of the rock drilling trolley; the ore slurry collection tray is used to collect the ore slurry of the target ore body that flows in from the drill bit of the rock drilling trolley along the drill pipe; the The pulp collection tray is communicated with the inside of the coil sensor; the coil sensor is used to detect the voltage when the pulp flows to obtain the sensor voltage; the data measurement and processing instrument is connected with the coil sensor; the data measurement and processing instrument for calculating the inductance value of the coil sensor according to the sensor voltage, and determining the content of magnetic minerals in the pulp according to the inductance value;

The drilling monitoring system is used to measure the drilling displacement and drilling torque of the drill pipe, and according to the relationship between the drilling displacement and the drilling time, calculate the advancing speed of the drill pipe. The drilling torque determines the occurrence state of the target ore body; the occurrence state at least includes the thickness of the ore body, the position of the gangue and the boundary of the ore body.

Optionally, the coil sensor specifically includes: a glass steel pipe, an enameled coil and a magnetic sleeve;

The enameled coil is wound on the outside of the glass steel pipe; the magnetic sleeve is sleeved on the outside of the enameled coil; one end of the glass steel pipe is communicated with the pulp collection tray; the enameled coil is connected to the data measurement The processor is connected; the enameled coil is used to detect the sensor voltage when the slurry flows in the glass steel pipe, and send the sensor voltage to the data measurement and processor.

Optionally, the borehole monitoring system specifically includes: a laser displacement sensor and a torque sensor;

The laser displacement sensor is used to emit laser light to irradiate one end of the drill rod propulsion device; the other end of the drill rod propulsion device is connected to one end of a power head connecting rod; the other end of the power head connecting rod is connected to the drill rod rod; the torque sensor is located at the connection between the power head connecting rod and the drill rod; the laser displacement sensor is used to measure the drilling displacement of the drill rod; the torque sensor is used to measure the drill rod drilling torque.

Optionally, the borehole monitoring system further includes: a data processing system;

The data processing system is respectively connected with the laser displacement sensor and the torque sensor; the data processing system is used to calculate the advancing speed of the drill pipe according to the relationship between the drilling displacement and the drilling time, and Rod advancement speed and the drilling torque determine the state of occurrence of the target ore body.

Optionally, the data measurement and processing instrument specifically includes: a single-chip microcomputer, a first processing circuit and a second processing circuit;

The output end of the single-chip microcomputer is connected to the input end of the coil sensor through the first processing circuit; the single-chip microcomputer is used for outputting a square wave signal; the first processing circuit is used for converting the square wave circuit into a sine wave current excitation signal; the coil sensor is used for detecting the voltage of the slurry flowing under the excitation of the sinusoidal current excitation signal to obtain the sensor voltage;

The input end of the second processing circuit is respectively connected with the input end of the coil sensor and the output end of the coil sensor; the output end of the second processing circuit is connected with the input end of the single-chip microcomputer; the second The processing circuit is used for amplifying and converting the internal resistance voltage of the coil sensor and the sensor voltage to obtain the processed internal resistance voltage and the processed sensor voltage; the single-chip microcomputer is also used for processing according to the processed internal resistance voltage Calculate the inductance value of the coil sensor with the processed sensor voltage, and determine the content of magnetic minerals in the pulp according to the inductance value.

Optionally, the first processing circuit specifically includes: a band-pass filter circuit and a voltage-current conversion circuit;

The output end of the single-chip microcomputer is connected with the input end of the voltage-current conversion circuit through the band-pass filter circuit; the output end of the voltage-current conversion circuit is connected with the input end of the coil sensor;

The band-pass filter circuit is used for setting the square wave signal to obtain a sinusoidal voltage signal; the voltage-current conversion circuit is used for converting the sinusoidal voltage signal into a sinusoidal current excitation signal.

Optionally, the second processing circuit specifically includes: a phasor voltage measurement circuit, a voltage translation circuit, and an analog-to-digital conversion circuit;

The input end of the phasor voltage measurement circuit is respectively connected with the input end of the coil sensor and the output end of the coil sensor; the output end of the phasor voltage measurement circuit is connected with the input end of the voltage translation circuit; The output end of the voltage shift circuit is connected with the input end of the analog-to-digital conversion circuit; the output end of the analog-to-digital conversion circuit is connected with the input end of the single-chip microcomputer;

The phasor voltage measurement circuit is used to amplify the internal resistance voltage of the coil sensor and the sensor voltage to obtain the resistance phasor voltage and the sensor phasor voltage; the voltage translation circuit is used to amplify the resistance phasor voltage The voltage and the sensor phasor voltage are converted into the set voltage range, and the converted resistance phasor voltage and the converted sensor phasor voltage are obtained; the analog-to-digital conversion circuit is used for converting the converted resistance phasor voltage and The converted sensor phasor voltages are respectively subjected to analog-to-digital conversion to obtain the processed internal resistance voltage and the processed sensor voltage.

Optionally, the magnetic mineral detection device further comprises: a connecting pipe;

A through hole is set on the pulp collection tray; the connecting pipe is used for connecting the through hole with the glass steel pipe.

Compared with the prior art, the beneficial effects of the present invention are:

The embodiment of the present invention proposes a real-time detection device while drilling for the occurrence state of magnetic ore bodies in an underground mining area. The ore slurry collection tray is sleeved on the drill pipe of the rock drilling rig; The ore slurry flowing in along the drill pipe at the drill bit; the slurry collection tray is connected with the interior of the coil sensor; the coil sensor is used to detect the voltage when the ore slurry flows, and the sensor voltage is obtained; the data measurement processor is connected with the coil sensor; The sensor voltage calculates the inductance value of the coil sensor, and determines the content of magnetic minerals in the slurry according to the inductance value; the drilling monitoring system measures the drilling displacement and drilling torque of the drill pipe, and calculates the drill pipe advancement according to the drilling displacement and the drilling time. Speed, combined with drill pipe advancing speed and drilling torque, determine the occurrence state of the target ore body. The invention uses the principle of inductance to collect the ore slurry at the drill bit in real time during the drilling process, uses the coil sensor and the data measurement processor to detect the content of the magnetic minerals in the ore slurry in real time, and uses the drilling system to detect the occurrence state of the magnetic minerals. The purpose of real-time monitoring of the content and occurrence state of magnetic minerals, compared with offline detection by sampling, saves man-hours, greatly reduces time costs, and improves measurement accuracy.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

1 is a structural diagram of a device for real-time detection while drilling of a magnetic ore body occurrence state in an underground mining area provided by an embodiment of the present invention;

2 is a schematic diagram of the assembly of the slurry collection tray, the coil sensor and the drill pipe, respectively, provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a data measurement and processing instrument provided by an embodiment of the present invention.

FIG. 4 is a structural diagram of a borehole monitoring system in a real-time detection while drilling device for detecting the occurrence state of magnetic ore bodies in an underground mining area according to an embodiment of the present invention.

Symbol Description:

1- drill bit; 2- flush pipe; 3- drill pipe; 4- slurry collection tray; 5- connecting pipe; 6- magnetic sleeve; 7- enameled coil; 8- glass steel pipe; 9- connecting wire; 10- data measurement Processor; 11-fixed bracket; 12-fixed base; 13-laser displacement sensor; 14-standard bullseye; 15-power head auxiliary device; 16-torque sensor; 17-power head connecting rod; 18-rock mass.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

China is rich in iron ore resources, but there are many problems in the current conventional prospecting, rock drilling and blasting methods, which are listed as follows:

(1) The prospecting network is too large and the geological work is insufficient. At present, the commonly used exploration method is to design the exploration network and drill geological drilling holes for geological exploration, but most of the exploration grid parameters are usually designed to be 50 × 50m, that is, a geological drilling hole is drilled within an average of ^2500m2 , and some even If it reaches 100×100m, if a precise prospecting network is set up, it will consume a lot of manpower and material resources. The resulting problems include: (1) It is difficult to accurately obtain the detailed information inside the rock formation. Such as gangue inclusion in the ore body, ore grade division, accurate ore body thickness, cavities and broken zones in the ore body, etc. These problems will lead to: greatly increased ore damage rate; too long drilling holes and mismatch of explosives, which will increase the cost of drilling holes and explosives; disasters and hidden dangers caused by failure to intervene in time when drilling into geological risk areas Wait. ② It is difficult to establish a refined 3D geological model. The dilution rate and loss rate in the underground mining of metal mines depend on the three-dimensional geological model. They are the service life of the mine and the main technical and economic indicators, but it is difficult to control and count in the mining process, mainly due to the lack of geological work on mineral resources. Under the current geological exploration process, refined geological work and the construction of transparent mines require a lot of manpower and material resources, which is difficult to carry out. (2) Off-line detection of geological coring takes a long time.

In order to solve the above problems, the present invention provides a real-time detection device while drilling for the occurrence state of magnetic ore bodies in the underground mining area, so that the rock drilling rig is combined with relevant accessories, and the ore slurry obtained during the drilling process is collected in real time by using the principle of inductance, and then Use relevant instruments to detect the content of magnetic minerals in ore slurry in real time, determine the occurrence of ore bodies in rock formations, and use some sensors and supporting tools from the perspective of different mechanical properties of drilling rock masses, ore bodies, and geological disaster risk areas. The data acquisition and processing system (the ore body occurrence identification system based on drilling parameters) collects the mechanical parameters of the rock during the rock drilling process, feeds back the calculation results in time, and matches the ore body determined by the real-time monitoring device for the magnetic content of the drilling slurry The thickness of the gangue, the occurrence of gangue, and the ore grade division are compared to further improve the accuracy and reliability of the identification system. In addition, the ore body occurrence identification system based on drilling parameters can also identify geological disaster risk areas and conduct risk assessment in time.

Specific examples are provided below to specifically describe the device for real-time detection while drilling of the occurrence state of magnetic ore bodies in underground mining areas of the present invention.

Referring to FIG. 1 , the real-time detection device while drilling for the occurrence state of magnetic ore bodies in the underground mining area of the present embodiment includes: a magnetic mineral detection device; the magnetic mineral detection device includes: a pulp collection tray 4 , a coil sensor and a data measurement process Meter 10. The ore slurry collection tray 4 is sleeved on the drill pipe 3 of the rock drilling rig; the ore slurry collection tray 4 is used to collect the target ore body that flows in from the drill bit 1 of the rock drilling rig along the drill pipe 3 The pulp collecting tray 4 is communicated with the inside of the coil sensor; the coil sensor is used to detect the voltage when the pulp is flowing to obtain the sensor voltage; the data measurement and processing instrument 10 is used with the coil sensor The connection line 9 is connected; the data measurement and processing instrument 10 is used for calculating the inductance value of the coil sensor according to the sensor voltage, and determining the content of magnetic minerals in the pulp according to the inductance value. The borehole monitoring system is used to measure the drilling displacement and drilling torque of the drill pipe 3, and calculate the drill pipe advancing speed according to the relationship between the drilling displacement and time. The drilling torque determines the occurrence state of the target ore body; the occurrence state at least includes the thickness of the ore body, the position of the gangue and the boundary of the ore body.

The magnetic mineral detection device in this embodiment has a relatively simple structure, a complete measurement system, stable performance, accurate measurement, and is not affected by temperature drift, and can adapt to the complex electromagnetic environment on site.

In one example, the coil sensor specifically includes: a glass steel pipe 8 , an enameled coil 7 and a magnetic sleeve 6 .

The enameled coil 7 is wound on the outside of the glass steel pipe 8; the magnetic sleeve 6 is sleeved on the outside of the enameled coil 7; one end of the glass steel pipe 8 is communicated with the pulp collection tray 4; the enameled wire The coil 7 is connected with the data measurement and processing instrument; the enameled coil 7 is used to detect the sensor voltage when the slurry flows in the glass steel pipe 8, and send the sensor voltage to the data measurement processing Meter 10.

Specifically, the magnetic mineral detection device further includes: a connecting pipe 5 ; a through hole is formed on the pulp collecting tray 4 ; the connecting pipe 5 is used for connecting the through hole with the glass steel pipe 8 .

In practical application, the connecting pipe 5 is directly connected with the glass steel pipe 8 inside the sensor, and the magnetic material slurry flows through it. On the outer circumference of the ring 7, the magnetic sleeve 6 is divided into two layers: inner and outer layers, both of which are made of steel, which can effectively prevent magnetic flux leakage.

The influence of the inductive medium in the middle of the enameled coil 7 in the coil sensor is more sensitive than that of the two ends. The enameled coil 7 can choose a solenoid type solenoid coil. The starting point is connected to the middle of the coil sensor.

The enameled coil 7 can select sinusoidal current as the excitation signal, which can prevent the temperature drift from causing unnecessary influence on the system measurement result.

In an example, referring to FIG. 2 , there is a frustum between the bottom and the top of the slurry collection tray 4 beyond a certain distance, the frustum is hollow, and the drill pipe 3 of the rock drilling trolley passes through the center of the frustum, and the top of the frustum is connected to the drill pipe 3 Close but not fit, does not affect the rotation of the drill pipe 3.

In an example, referring to FIG. 3 , the data measurement and processing instrument 10 specifically includes: a single-chip microcomputer, a first processing circuit, a second processing circuit and a display circuit.

The output end of the single-chip microcomputer is connected to the input end of the coil sensor through the first processing circuit; the single-chip microcomputer is used for outputting a square wave signal; the first processing circuit is used for converting the square wave circuit into a sine wave Current excitation signal; the coil sensor is used to detect the voltage of the slurry flowing under the excitation of the sinusoidal current excitation signal to obtain the sensor voltage.

The input end of the second processing circuit is respectively connected with the input end of the coil sensor and the output end of the coil sensor; the output end of the second processing circuit is connected with the input end of the single chip microcomputer; The output end is also connected with the display circuit; the second processing circuit is used for amplifying and converting the internal resistance voltage of the coil sensor and the sensor voltage to obtain the processed internal resistance voltage and the processed sensor voltage; The single chip microcomputer is also used for calculating the inductance value of the coil sensor according to the processed internal resistance voltage and the processed sensor voltage, and determining the content of magnetic minerals in the pulp according to the inductance value. The display circuit is used to display the content of magnetic minerals in the pulp. The inductance value of the sensor can be obtained from the phasor ratio of the processed internal resistance voltage and the processed sensor voltage.

Specifically, the type of the single-chip microcomputer can be a PIC16F877 type single-chip microcomputer, which is an 8-bit single-chip microcomputer. It adopts a simplified instruction set Harvard structure and a two-level pipelined instruction fetching method. The crystal oscillator frequency can reach 20MHz, and the execution time of the unit cycle instruction can reach 200ms, and contains peripheral resources such as FLASH, EEPROM, PWM output, IIC interface, etc., with low price, simplified instruction set, low power consumption, etc., suitable for industrial field use.

Specifically, the first processing circuit specifically includes: a band-pass filter circuit and a voltage-current conversion circuit.

The output end of the single-chip microcomputer is connected with the input end of the voltage-current conversion circuit through the band-pass filter circuit; the output end of the voltage-current conversion circuit is connected with the input end of the coil sensor; the band-pass filter circuit It is used to set the square wave signal to obtain a sinusoidal voltage signal; the voltage-current conversion circuit is used to convert the sinusoidal voltage signal into a sinusoidal current excitation signal.

Specifically, the second processing circuit specifically includes: a phasor voltage measurement circuit, a voltage translation circuit, and an analog-to-digital conversion circuit.

The input end of the phasor voltage measurement circuit is respectively connected with the input end of the coil sensor and the output end of the coil sensor; the output end of the phasor voltage measurement circuit is connected with the input end of the voltage translation circuit; The output end of the voltage shift circuit is connected with the input end of the analog-to-digital conversion circuit; the output end of the analog-to-digital conversion circuit is connected with the input end of the single-chip microcomputer.

The phasor voltage measurement circuit is used to amplify the internal resistance voltage of the coil sensor and the sensor voltage to obtain the resistance phasor voltage and the sensor phasor voltage; the voltage translation circuit is used to amplify the resistance phasor voltage The voltage and the sensor phasor voltage are converted into the set voltage range (such as 0-5V), and the converted resistance phasor voltage and the converted sensor phasor voltage are obtained to meet the voltage of the input signal by the analog-to-digital conversion circuit. requirements; the analog-to-digital conversion circuit is used to perform analog-to-digital conversion on the converted resistance phasor voltage and the converted sensor phasor voltage, respectively, to obtain the processed internal resistance voltage and the processed sensor voltage, so as to achieve the measurement accuracy. The purpose of digital sampling of a signal.

In one example, the AD632 amplifier is used in the phasor voltage measurement circuit. The AD632 amplifier precisely amplifies the internal resistance voltage of the coil sensor and the sensor voltage, and simultaneously suppresses interference signals to obtain high-quality resistance phasor voltage and sensor phase voltage. amount of voltage.

In one example, the drilling rig is equipped with a punching device and a flushing pipe 2 during production, and the punching device is located at the drill bit 1; the flushing pipe 2 is arranged inside the drill pipe 3; The water pipe 2 communicates with the flushing device. The flushing device is used for flushing the ore slurry at the drill bit 1 , so that the ore slurry flows into the ore slurry collection tray 4 along the drill pipe 3 .

In an example, the magnetic mineral detection device further includes: a fixing bracket 11; one end of the fixing bracket 11 is supported on the ground, and the other end is supported on the pulp collecting tray 4 and the coil sensor, and these instruments are fixed.

In one example, the borehole monitoring system may be a DPM-type borehole process monitoring system.

The borehole monitoring system is connected with the data measurement and processing instrument; the borehole monitoring system is used to measure the drilling displacement and drilling torque of the drill pipe 3; the data measurement and processing instrument is used to measure the The content of the magnetic minerals in the medium, the drilling position and the drilling torque determine the ore body information; the ore body information at least includes the gangue position, the ore body boundary and the ore body thickness. The display circuit in the data measurement and processing instrument is also used to display the ore body information.

At present, the DPM type drilling process monitoring system is equipped with a distance sensor: it is used to monitor the position of the power sliding body of the drilling rig on the chain, so as to measure the number of drill rods used and the length of each drill rod, as well as the drilling depth and depth of the DTH hammer. Drilling depth. In the present invention, the laser displacement sensor 13 is preferably replaced to be matched with the rock drilling rig, and the torque sensor 16 is matched with the system.

Specifically, referring to FIG. 4 , the borehole monitoring system specifically includes: a laser displacement sensor 13 and a torque sensor 16 . The laser displacement sensor 13 is used to emit laser light to irradiate one end of the drill pipe propulsion device, and the irradiation point is the standard bullseye 14, and the standard bullseye 14 is specifically located on the power head auxiliary device 15 at the end of the drill pipe propulsion device; The other end of the drill rod propulsion device is connected to one end of the power head connecting rod 17; the other end of the power head connecting rod 17 is connected to the drill rod 3, and the drill rod 3 enters the rock mass 18; the torque sensor 16 is located at The connection between the power head connecting rod 17 and the drill rod 3 ; the laser displacement sensor 13 is used to measure the drilling displacement of the drill rod 3 ; the torque sensor 16 is used to measure the drill rod 3 . Drilling torque.

In practical applications, the laser displacement sensor 13 is located at the lower part of the drill pipe propulsion device, and is fixed with the fixed base 12 dedicated to the drilling rig, monitors the drilling displacement in real time, and records the drilling time for calculating the drilling rate. Because the sensor works synchronously with the magnetic mineral detection device, the recorded drilling displacement and drilling time can correspond to the data fed back by the magnetic mineral detection device at each time point, which can help the device to accurately record the gangue in the ore body. Location and boundaries of the ore body.

The selected DPM type drilling monitoring system is only equipped with a laser displacement sensor 13 and a torque sensor 16. The purpose is that the drilling rig controls the drilling pressure and the rotation speed of the drill bit 1 to be constant, so as to monitor the drilling rate and drilling torque of the drilling rig. Among the massive measurement parameters, the rotational speed of the drill bit 1 and the drilling pressure are independent parameters, which are not affected by the lithology of the drilling rock mass, while the rotational torque and the drilling rate are the influencing parameters, which not only depend on the drilling rig itself, but also are affected by the mechanical properties of the rock. , according to the different mechanical properties of the rock, the influence parameters measured by the sensor respond to different principles, and the ore body can be identified.

One end of the laser displacement sensor 13 is fixed on the special fixed base 12, and is matched with trolleys of different structures according to the actual situation, and the laser irradiation is perpendicular to the drill pipe propulsion device.

The torque sensor 16 is a cylindrical shaft at both ends, and is installed between the drill rod 3 and the power head connecting rod 17 to monitor the torque change of the drill rod 3 in real time during the drilling process.

In one example, the borehole monitoring system further includes: a data processing system. The data processing system is respectively connected with the laser displacement sensor 13 and the torque sensor 16; the data processing system is used to determine the occurrence state of the target ore body according to the drilling position and the drilling torque .

The laser displacement sensor 13 and the torque sensor 16 are both connected to the data recorder through the connecting line 9, and the data recorder can be connected to the data processing system through a data adapter, and the data processing system can be a computer terminal to realize data display and processing.

The real-time detection device while drilling the magnetic ore body occurrence state in the underground mining area of this embodiment has the following advantages:

(1) On-site real-time monitoring and acquisition of the content and occurrence state of magnetic minerals can accurately delineate the boundary of the ore body, guide the design of blasting parameters on-site, reduce unnecessary drilling lengths, significantly reduce drilling costs, and improve work efficiency. Reduce the ore dilution caused by the broken rock outside the ore due to the long blast hole, and significantly reduce the cost of ore handling and beneficiation.

(2) The on-site real-time monitoring and acquisition of the content and occurrence state of magnetic minerals saves man-hours and greatly reduces time costs compared with offline sampling detection.

A more specific implementation manner is given below to further describe the above embodiment.

The magnetic mineral detection device starts the measurement synchronously with the borehole monitoring system.

1. Magnetic mineral detection device

As shown in Figures 1 and 2, the magnetic mineral detection device includes a slurry collection tray 4, a coil sensor, a data measurement processor 10, a fixed bracket 11, etc., and the drill pipe 3 of the drilling rig passes through the slurry collection tray 4, and the slurry collects The tray 4, the coil sensor connecting pipe, and the coil sensor are uniformly supported by the fixed bracket 11. The middle of the coil sensor is connected to the data measurement and processing instrument 10 through the connecting line 9. The instrument is reset to zero and ready for measurement.

The drilling rig drills the upward blast hole, and the drill bit 1 is equipped with a flushing device for flushing drill cuttings. The washed ore slurry flows into the ore slurry collection tray 4 at the bottom of the drill pipe 3 along the drilled blast hole, and the ore slurry passes through the connection. The tube 5 passes through the coil sensor at a constant speed, and the measurement system starts to work and record in real time.

1) The working principle of the detection device:

When the slurry containing ferromagnetic minerals dynamically passes through the FRP pipe 8 of the coil sensor, only the magnetic heavy medium will cause the coil inductance to change, while other components will not cause the inductance to change. By detecting its inductance value in real time, the purpose of detecting the content value of the magnetic heavy medium in real time can be achieved.

2) Detection principle:

As shown in formula (1), the inductance value of the coil sensor is only related to the coil length l, the number of turns N, and the cross-sectional area S. When these parameters are fixed, the inductance value L is only related to the permeability μ ₀ , and has a linear relationship with the inductance value. The magnetic permeability is affected by the content of the magnetic material in the glass steel pipe 8, and other material components will not cause its value to change. Therefore, the more the magnetic material content, the greater the magnetic permeability and the greater the inductance value.

L=μ ₀ N ² S/l (1)

When the suspension flows through the FRP 8 of the coil sensor, the content of the ferromagnetic heavy medium affects the inductance value L of the sensor. According to Lenz's law, it can be deduced that:

i represents the induced current, and t represents the time. From formula (1) and formula (2), it can be known that the sensor voltage V1 changes with the change of the content of the magnetic substance in the tube. The higher the content, the higher the voltage. Therefore, the voltage value of the coil sensor can reflect the change of the content of the magnetic substance in the glass steel pipe 8 .

3) Introduction to the working process of the detection device:

a. First, the excitation signal is generated by the control of the single-chip microcomputer and applied to the coil sensor, and the two ends of the coil sensor generate induced electromotive force. During the measurement process, the internal resistance of the coil sensor will change with the change of temperature. In order to prevent the temperature drift from affecting the measurement results, the sinusoidal current signal is selected as the excitation signal to avoid internal resistance interference. In order to obtain a stable excitation signal, a single-chip microcomputer is used to generate a stable and reliable square wave signal with a value of 100Hz, and then the signal is set by filtering, and a sinusoidal voltage signal of the corresponding frequency is obtained after settling with an active filter circuit. Through the voltage-current conversion circuit, the sinusoidal voltage excitation signal is converted into a sinusoidal current excitation signal with an amplitude of about 20mA.

b. Measure the coil sensor voltage value and send it to the microcontroller. The sensor voltage V1 and the internal resistance voltage V2 can be measured through the phasor voltage measurement circuit, the voltage translation circuit, and the AD conversion circuit. From the measurement principle of the ferromagnetic mineral content, it can be known that by collecting the phase signals of the sensor voltage V1 and the internal resistance voltage V2 The sensor inductance value can be obtained by measuring the ratio.

c. Obtain the inductance of the coil sensor through relevant calculations. The inductance value is proportional to the content of ferromagnetic minerals, corresponding to the amount of magnetic minerals, which is displayed in the format of time-magnetic content relative value. Due to the synchronous work, the recorded time can correspond to the time recorded in the DPM type drilling monitoring system. Through the time, the drilling displacement can be corresponding to the magnetic content in the slurry, so as to accurately match the magnetic content to the ore body. specific location in .

2. Borehole monitoring system

The drilling monitoring system is realized by the iron ore body identification method based on drilling parameters.

As shown in Figure 4, taking a certain type of rock drilling rig as an example, the drilling monitoring system is matched with the rock drilling equipment, and other rock drilling equipment can also be installed according to the actual situation. The monitoring system selects supporting devices including a laser displacement sensor 13, a torque sensor 16, a data recorder, and a computer. One end of the laser displacement sensor 13 is fixed on the special fixed base 12, and is matched with trolleys of different structures according to the actual situation, and the laser irradiation is perpendicular to the drill pipe propulsion device. The torque sensor 16 is a cylindrical shaft at both ends, and is installed between the drill rod 3 and the power head connecting rod 17 . Both the laser displacement sensor 13 and the torque sensor 16 are connected with the data recorder through the connecting line 9, and the data recorder is connected with the computer through the data transfer line, start the rock drilling equipment, and set the parameters of the rock drilling equipment, that is, control the drilling pressure and the drill bit 1 When the rotation speed is constant, the drilling monitoring system is activated to collect drilling parameters.

Measurement principle:

The mechanical properties of rock are obviously different from those of iron ore. The RQD value of rock is much smaller than that of iron ore. The drilling torque and drilling rate are used as influencing parameters, and their magnitudes are affected by the mechanical properties of rock. The influence parameters respond to different principles, and ore body identification can be carried out. Due to the difference in mechanical properties, if there is a step change in the drilling rate and drilling torque during the drilling process, or after a lot of field test experience, the change thresholds of the drilling rate and drilling torque of the iron ore body can be clarified. It is determined that the drilling rig has crossed the boundary between the ore body and the rock mass or the gangue in the ore body, and the data measured by the laser displacement sensor 13 is recorded at this time, that is, the specific height of the ore-rock boundary or the gangue in the borehole.

The invention breaks through the existing off-line detection method and the traditional prospecting method, overcomes the technical defects that the magnetic mineral content cannot be obtained in real time for grade division, the thickness of the ore body cannot be accurately delineated, and the position of the gangue cannot be accurately detected, thereby providing a mining site, During the drilling process of the drilling rig, a detection device for detecting the content and occurrence state of magnetic substances in the flushing slurry in time. The monitoring system is combined to achieve on-site real-time monitoring, save time and cost, accurately ore body thickness and ore body boundary, clarify the location of gangue, reduce ore dilution, and greatly reduce the cost of perforation, ore handling and beneficiation costs. Among the two sets of monitoring equipment matching the detection device, the magnetic mineral detection device is the main one, and the borehole monitoring system is the auxiliary.

Specifically, the combination of the magnetic mineral detection device and the drilling monitoring system can record the drilling displacement and drilling time in real time. The position and drilling time correspond to the monitored magnetic content. Secondly, the recorded drilling displacement can be further converted into the drilling rate. Combined with the drilling torque monitored by the torque sensor 16, according to the different mechanical properties of the rock, the drilling torque is different from the drilling torque. The drilling rate responds to different principles, which can further identify the accurate orientation of the magnetic ore body. The identification results of the two systems can be compared with each other, which can further improve the accuracy and stability of the invention, so that the invention can quickly and real-time get the ore layer penetrated. The specific orientation of the gangue and the specific thickness of the ore body reduce the time cost, perforation cost and blasting cost of mining activities. Secondly, it is of great significance to prospecting and precise ore drawing projects, thereby reducing the cost of raw ore handling and beneficiation.

The real-time detection device while drilling the magnetic ore body occurrence state in the underground mining area of the present invention also has the following advantages:

(1) Accurately detect the position of the gangue in the ore body, and match the gangue reasonably with explosives, which can avoid the increase of blasting cost caused by the excessive fragmentation of the gangue.

(2) Classify the grade of the ore, guide the ore drawing, and separate the gangue and the ore to draw the ore separately, which can greatly reduce the mixing of the ore and the gangue, thereby reducing the cost of ore handling and beneficiation.

(3) During the drilling process, the accurate identification of geological disaster areas is carried out, and the weak roof is properly supported in time, so as to reduce potential safety hazards and reduce the occurrence of disasters.

In addition, according to the calculation, the handling and beneficiation cost of the raw ore is about 50 yuan/t. If the gangue is effectively eliminated, the ore handling cost and the beneficiation cost can be saved by about 20 yuan/t, which can save a huge cost for the enterprise. In addition, the rock drilling blasthole can achieve a 2m hole, which meets the standard for establishing a refined and transparent mine.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the device and the core idea of the present invention; meanwhile, for those skilled in the art, according to the present invention There will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (8)

1. a real-time detection device while drilling for the occurrence state of magnetic ore body in an underground mining area, it is characterized in that, comprising: magnetic mineral detection device and borehole monitoring system; Described magnetic mineral detection device, comprises: ore pulp collection tray, coil sensor and data measurement processor; The ore slurry collection tray is sleeved on the drill pipe of the rock drilling trolley; the ore slurry collection tray is used to collect the ore slurry of the target ore body that flows in from the drill bit of the rock drilling trolley along the drill pipe; the The pulp collection tray is communicated with the inside of the coil sensor; the coil sensor is used to detect the voltage when the pulp flows to obtain the sensor voltage; the data measurement and processing instrument is connected with the coil sensor; the data measurement and processing instrument for calculating the inductance value of the coil sensor according to the sensor voltage, and determining the content of magnetic minerals in the pulp according to the inductance value; The drilling monitoring system is used to measure the drilling displacement and drilling torque of the drill pipe, and calculate the drill pipe advancing speed according to the relationship between the drilling displacement and time. The drilling torque determines the occurrence state of the target ore body; the occurrence state at least includes the thickness of the ore body, the position of the gangue and the boundary of the ore body. 2. The device for real-time detection while drilling of a magnetic ore body occurrence state in an underground mining area according to claim 1, wherein the coil sensor specifically comprises: a glass steel pipe, an enameled coil and a magnetic sleeve; The enameled coil is wound on the outside of the glass steel pipe; the magnetic sleeve is sleeved on the outside of the enameled coil; one end of the glass steel pipe is communicated with the pulp collection tray; the enameled coil is connected to the data measurement The processor is connected; the enameled coil is used to detect the sensor voltage when the slurry flows in the glass steel pipe, and send the sensor voltage to the data measurement and processor. 3. The device for real-time detection while drilling of a magnetic ore body occurrence state in an underground mining area according to claim 1, wherein the borehole monitoring system specifically comprises: a laser displacement sensor and a torque sensor; The laser displacement sensor is used to emit laser light to irradiate one end of the drill rod propulsion device; the other end of the drill rod propulsion device is connected to one end of a power head connecting rod; the other end of the power head connecting rod is connected to the drill rod rod; the torque sensor is located at the connection between the power head connecting rod and the drill rod; the laser displacement sensor is used to measure the drilling displacement of the drill rod; the torque sensor is used to measure the drill rod drilling torque. 4. The device for real-time detection while drilling of the occurrence state of magnetic ore bodies in an underground mining area according to claim 3, wherein the borehole monitoring system further comprises: a data processing system; The data processing system is respectively connected with the laser displacement sensor and the torque sensor; the data processing system is used for calculating the drill pipe advancing speed according to the relationship between the drilling displacement and time, and according to the drill pipe advancing speed The speed and the drilling torque determine the state of occurrence of the target ore body. 5 . The device for real-time detection while drilling of the magnetic ore body occurrence state in an underground mining area according to claim 1 , wherein the data measurement and processing instrument specifically comprises: a single-chip microcomputer, a first processing circuit and a second processing device. 6 . circuit; The output end of the single-chip microcomputer is connected to the input end of the coil sensor through the first processing circuit; the single-chip microcomputer is used for outputting a square wave signal; the first processing circuit is used for converting the square wave circuit into a sine wave current excitation signal; the coil sensor is used for detecting the voltage of the slurry flowing under the excitation of the sinusoidal current excitation signal to obtain the sensor voltage; The input end of the second processing circuit is respectively connected with the input end of the coil sensor and the output end of the coil sensor; the output end of the second processing circuit is connected with the input end of the single-chip microcomputer; the second The processing circuit is used for amplifying and converting the internal resistance voltage of the coil sensor and the sensor voltage to obtain the processed internal resistance voltage and the processed sensor voltage; the single-chip microcomputer is also used for processing according to the processed internal resistance voltage Calculate the inductance value of the coil sensor with the processed sensor voltage, and determine the content of magnetic minerals in the pulp according to the inductance value. 6. The device for real-time detection while drilling of a magnetic ore body occurrence state in an underground mining area according to claim 5, wherein the first processing circuit specifically comprises: a band-pass filter circuit and a voltage-current conversion circuit; The output end of the single-chip microcomputer is connected with the input end of the voltage-current conversion circuit through the band-pass filter circuit; the output end of the voltage-current conversion circuit is connected with the input end of the coil sensor; The band-pass filter circuit is used for setting the square wave signal to obtain a sinusoidal voltage signal; the voltage-current conversion circuit is used for converting the sinusoidal voltage signal into a sinusoidal current excitation signal. 7. The device for real-time detection while drilling of magnetic ore body occurrence state in an underground mining area according to claim 5, wherein the second processing circuit specifically comprises: a phasor voltage measurement circuit, a voltage translation circuit and a analog-to-digital conversion circuit; The input end of the phasor voltage measurement circuit is respectively connected with the input end of the coil sensor and the output end of the coil sensor; the output end of the phasor voltage measurement circuit is connected with the input end of the voltage translation circuit; The output end of the voltage shift circuit is connected with the input end of the analog-to-digital conversion circuit; the output end of the analog-to-digital conversion circuit is connected with the input end of the single-chip microcomputer; The phasor voltage measurement circuit is used to amplify the internal resistance voltage of the coil sensor and the sensor voltage to obtain the resistance phasor voltage and the sensor phasor voltage; the voltage translation circuit is used to amplify the resistance phasor voltage The voltage and the sensor phasor voltage are converted into the set voltage range, and the converted resistance phasor voltage and the converted sensor phasor voltage are obtained; the analog-to-digital conversion circuit is used for converting the converted resistance phasor voltage and The converted sensor phasor voltages are respectively subjected to analog-to-digital conversion to obtain the processed internal resistance voltage and the processed sensor voltage. 8 . The device for real-time detection while drilling of the occurrence state of magnetic ore bodies in an underground mining area according to claim 2 , wherein the magnetic mineral detection device further comprises: a connecting pipe; 9 . A through hole is set on the pulp collection tray; the connecting pipe is used for connecting the through hole with the glass steel pipe.

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