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

Abstract

The invention discloses a device for real-time detection of the occurrence state of magnetic ore bodies in underground mining areas, and relates to the field of underground mining of metal ore deposits, wherein the magnetic mineral detection device comprises: a slurry collection tray, a coil sensor and a data measurement processor; the slurry collection tray is used to collect the slurry flowing in from the drill bit of the rock drilling trolley along the drill rod; the coil sensor detects the voltage when the slurry flows to obtain the sensor voltage; the data measurement processor is connected to the coil sensor; the data measurement processor calculates the inductance value of the coil sensor from the sensor voltage to determine the content of magnetic minerals in the slurry; the drilling monitoring system measures the drilling displacement and drilling torque of the drill rod, calculates the drilling rod propulsion speed according to the relationship between the drilling displacement and time, and determines the occurrence state of the target ore body from the drilling rod propulsion speed and the drilling torque. The invention can monitor the content and occurrence state of magnetic minerals in real time on site, reduce time cost, and improve measurement accuracy.

Description

Technical Field

[0001] The invention relates to the field of underground mining of metal ore deposits, and in particular to a device for real-time detection of the occurrence state of magnetic ore bodies in underground mining areas while drilling. Background Art

[0002] At present, the exploration of non-ferrous metal ore bodies often requires on-site rock drilling and coring. After collecting a large number of cores, they are transported back to the testing center for offline testing. This process consumes a lot of manpower and material resources, and cannot provide real-time guidance for on-site rock drilling and blasting work, which greatly prolongs the construction period. In addition, the effect is worse than in-situ testing, which brings many uncertainties to the site. Summary of the invention

[0003] Based on this, an embodiment of the present invention provides a device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas while drilling, so as to monitor the content and occurrence status of magnetic minerals in real time on site, reduce time cost and improve measurement accuracy.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas while drilling, comprising: a magnetic mineral detection device and a drilling monitoring system; the magnetic mineral detection device comprises: a slurry collection tray, a coil sensor and a data measurement processor;

[0006] The slurry collection tray is sleeved on the drill rod of the drilling rig; the slurry collection tray is used to collect the slurry flowing into the target ore body from the drill bit of the drilling rig along the drill rod; the slurry collection tray is connected to the inside of the coil sensor; the coil sensor is used to detect the voltage when the slurry flows to obtain the sensor voltage; the data measurement processor is connected to the coil sensor; the data measurement processor is used to calculate the inductance value of the coil sensor according to the sensor voltage, and determine the content of magnetic minerals in the slurry according to the inductance value;

[0007] The drilling monitoring system is used to measure the drilling displacement and drilling torque of the drill rod, and calculate the drill rod advancement speed based on the relationship between the drilling displacement and the drilling time, and determine the occurrence state of the target ore body based on the drill rod advancement speed and the drilling torque; the occurrence state at least includes the ore body thickness, the location of the gangue and the ore body boundary.

[0008] Optionally, the coil sensor specifically comprises: a glass fiber reinforced plastic tube, an enameled coil and a magnetic sleeve;

[0009] The enameled coil is wound around the outside of the FRP pipe; the magnetic sleeve is sleeved on the outside of the enameled coil; one end of the FRP pipe is connected to the slurry collecting tray; the enameled coil is connected to the data measuring and processing instrument; the enameled coil is used to detect the sensor voltage when the slurry flows in the FRP pipe, and send the sensor voltage to the data measuring and processing instrument.

[0010] Optionally, the drilling monitoring system specifically includes: a laser displacement sensor and a torque sensor;

[0011] The laser displacement sensor is used to emit laser to illuminate one end of the drill rod propulsion device; the other end of the drill rod propulsion device is connected to one end of the power head connecting rod; the other end of the power head connecting rod is connected to the drill 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 drilling torque of the drill rod.

[0012] Optionally, the drilling monitoring system further includes: a data processing system;

[0013] The data processing system is connected to the laser displacement sensor and the torque sensor respectively; the data processing system is used to calculate the drill rod advancement speed according to the relationship between the drilling displacement and the drilling time, and determine the occurrence state of the target ore body according to the drill rod advancement speed and the drilling torque.

[0014] Optionally, the data measurement and processing instrument specifically comprises: a single chip microcomputer, a first processing circuit and a second processing circuit;

[0015] 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 to output a square wave signal; the first processing circuit is used to convert the square wave circuit into a sinusoidal current excitation signal; the coil sensor is used to detect the voltage of the slurry when it flows under the excitation of the sinusoidal current excitation signal to obtain a sensor voltage;

[0016] The input end of the second processing circuit is respectively connected to 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 to the input end of the single-chip microcomputer; the second processing circuit is used to amplify and convert 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 to calculate the inductance value of the coil sensor according to the processed internal resistance voltage and the processed sensor voltage, and determine the content of magnetic minerals in the slurry according to the inductance value.

[0017] Optionally, the first processing circuit specifically includes: a bandpass filtering circuit and a voltage-current conversion circuit;

[0018] The output end of the single chip microcomputer is connected to the input end of the voltage-current conversion circuit through the bandpass filter circuit; the output end of the voltage-current conversion circuit is connected to the input end of the coil sensor;

[0019] The bandpass filter circuit is used to adjust 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.

[0020] Optionally, the second processing circuit specifically includes: a phasor voltage measurement circuit, a voltage translation circuit and an analog-to-digital conversion circuit;

[0021] The input end of the phasor voltage measurement circuit is connected to the input end of the coil sensor and the output end of the coil sensor respectively; the output end of the phasor voltage measurement circuit is connected to the input end of the voltage shift circuit; the output end of the voltage shift circuit is connected to the input end of the analog-to-digital conversion circuit; the output end of the analog-to-digital conversion circuit is connected to the input end of the single-chip microcomputer;

[0022] 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 convert the resistance phasor voltage and the sensor phasor voltage into a set voltage range to obtain the converted resistance phasor voltage and the converted sensor phasor voltage; 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.

[0023] Optionally, the magnetic mineral detection device further comprises: a connecting pipe;

[0024] A through hole is provided on the slurry collecting tray; and the connecting pipe is used to connect the through hole with the glass fiber reinforced plastic pipe.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The embodiment of the present invention proposes a device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas while drilling, wherein a slurry collection tray is sleeved on the drill rod of a drilling rig; the slurry collection tray is used to collect slurry flowing along the drill rod from the drill bit of the drilling rig; the slurry collection tray is connected to the inside of a coil sensor; the coil sensor is used to detect the voltage when the slurry flows to obtain the sensor voltage; a data measurement processor is connected to the coil sensor; the data measurement processor is used to calculate the inductance value of the coil sensor according to the sensor voltage, and determine the content of magnetic minerals in the slurry according to the inductance value; a drilling monitoring system measures the drilling displacement and drilling torque of the drill rod, and calculates the drill rod advancement speed according to the drilling displacement combined with the drilling time, and determines the occurrence status of the target ore body in combination with the drill rod advancement speed and drilling torque. The present invention utilizes the inductance principle to collect the slurry at the drill bit in real time during the drilling process, utilizes a coil sensor and a data measurement processor to detect the content of magnetic minerals in the slurry in real time, utilizes a drilling system to detect the occurrence state of the magnetic minerals, and realizes the purpose of real-time monitoring the content and occurrence state of the magnetic minerals on site. Compared with sampling off-line detection, the present invention saves working hours, greatly reduces time cost, and improves measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 A structural diagram of a device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas while drilling provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of assembling the slurry collection tray, the coil sensor, and the drill rod provided in an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the structure of a data measurement and processing device provided in an embodiment of the present invention.

[0031] Figure 4 A structural diagram of a borehole monitoring system in a device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas provided by an embodiment of the present invention.

[0032] Explanation of symbols:

[0033] 1-drill bit; 2-water flushing pipe; 3-drill rod; 4-slurry collection tray; 5-connecting pipe; 6-magnetic sleeve; 7-enameled coil; 8-glass fiber reinforced plastic pipe; 9-connecting line; 10-data measurement and processing instrument; 11-fixed bracket; 12-fixed base; 13-laser displacement sensor; 14-standard target bull's eye; 15-power head auxiliary device; 16-torque sensor; 17-power head connecting rod; 18-rock mass. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] China is rich in iron ore resources, but the current conventional prospecting, rock drilling and blasting methods have many problems, as listed below:

[0037] (1) The prospecting network is too large and geological work is not carried out enough. At present, the commonly used prospecting method is to design an exploration network and drill geological boreholes for geological exploration, but most exploration grid parameters are usually designed to be 50×50m, that is, an average of 2500m 2 Drilling a geological borehole in the mine, some of which even reach 100×100m, will consume a lot of manpower and material resources if a precise prospecting network is set up for detailed exploration. The resulting problems include: ① It is difficult to accurately obtain detailed information on the rock layer. Such as the situation of gangue in the ore body, ore grade zoning, accurate ore body thickness, cavities and broken zones in the ore body, etc. These problems will lead to: a significant increase in the ore loss rate; excessive borehole length and mismatch of explosives, which increases the cost of drilling and explosives; and disasters and hidden dangers caused by failure to intervene in time after drilling into the geological risk area. ② It is difficult to establish a refined three-dimensional geological model. The depletion rate and loss rate in underground mining of metal mines rely on geological three-dimensional models. They are the service life of the mine and the main technical and economic indicators, but they are difficult to control and count during the mining process, mainly due to the insufficient development of geological work on mineral resources. However, under the current geological exploration process, refined geological work and the construction of transparent mines require a lot of manpower and material resources and are difficult to carry out. (2) Offline detection of geological coring is time-consuming.

[0038] In order to solve the above problems, the present invention provides a real-time detection device for the occurrence status of magnetic ore bodies in underground mining areas, which combines the rock drilling trolley with relevant accessories, uses the inductance principle to collect the slurry obtained by flushing during the drilling process in real time, and then uses relevant instruments to detect the content of magnetic minerals in the slurry in real time to determine the occurrence of the ore body in the rock formation. From the perspective of the different mechanical properties of the drilling rock body, ore body, and geological disaster risk area, some sensors and supporting data acquisition and processing systems (ore body occurrence identification system based on drilling parameters) are used to collect the mechanical parameters of the rock during the rock drilling process, and the calculation results are fed back in time. The calculation results are compared with the thickness of the ore body, the occurrence of interlayer gangue, and the ore grade zoning determined by the real-time monitoring device for the content of magnetic materials in the drilling slurry, so as to further improve the accuracy and credibility 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 a timely manner.

[0039] The following provides a specific embodiment to specifically illustrate the device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas while drilling according to the present invention.

[0040] See also Figure 1 The device for real-time detection of the occurrence state of magnetic ore bodies in underground mining areas of this embodiment includes: a magnetic mineral detection device; the magnetic mineral detection device includes: a slurry collection tray 4, a coil sensor and a data measurement and processing instrument 10. The slurry collection tray 4 is sleeved on the drill rod 3 of the drilling trolley; the slurry collection tray 4 is used to collect the slurry of the target ore body flowing along the drill rod 3 from the drill bit 1 of the drilling trolley; the slurry collection tray 4 is connected to the inside of the coil sensor; the coil sensor is used to detect the voltage when the slurry flows to obtain the sensor voltage; the data measurement and processing instrument 10 is connected to the coil sensor by a connecting line 9; the data measurement and processing instrument 10 is used to calculate the inductance value of the coil sensor according to the sensor voltage, and determine the content of magnetic minerals in the slurry according to the inductance value. The drilling monitoring system is used to measure the drilling displacement and drilling torque of the drill rod 3, and calculate the drill rod advancement speed based on the relationship between the drilling displacement and time, and determine the occurrence state of the target ore body based on the drill rod advancement speed and the drilling torque; the occurrence state at least includes the ore body thickness, the location of the gangue and the ore body boundary.

[0041] The magnetic mineral detection device in this embodiment has a relatively simple structure, a complete measurement system, stable performance, accurate measurement, is not affected by temperature drift, and can adapt to complex electromagnetic environments on site.

[0042] In one example, the coil sensor specifically includes: a glass fiber reinforced plastic tube 8 , an enameled coil 7 and a magnetic sleeve 6 .

[0043] The enameled coil 7 is wound around the outside of the FRP pipe 8; the magnetic sleeve 6 is sleeved on the outside of the enameled coil 7; one end of the FRP pipe 8 is connected to the slurry collecting tray 4; the enameled coil 7 is connected to the data measuring and processing instrument; the enameled coil 7 is used to detect the sensor voltage when the slurry flows in the FRP pipe 8, and send the sensor voltage to the data measuring and processing instrument 10.

[0044] Specifically, the magnetic mineral detection device further includes: a connecting pipe 5 ; a through hole is provided on the slurry collecting tray 4 ; and the connecting pipe 5 is used to connect the through hole with the glass fiber reinforced plastic pipe 8 .

[0045] In practical applications, the connecting pipe 5 is directly connected to the glass fiber reinforced plastic pipe 8 inside the sensor, and magnetic slurry flows therein. The enameled coil 7 is tightly wound around the outer periphery of the glass fiber reinforced plastic pipe 8, and the magnetic sleeve 6 is tightly wrapped around the outer periphery of the enameled coil 7. The magnetic sleeve 6 is divided into two layers, inner and outer layers, both of which are made of steel, and can effectively prevent magnetic leakage.

[0046] The middle part of the enameled coil 7 in the coil sensor is more sensitive to the influence of the medium than the two ends. The enameled coil 7 can be a solenoid type electromagnetic coil. When selecting a solenoid type electromagnetic coil, a short and thick coil should be selected, and the starting point of the connecting line is connected to the middle part of the coil sensor.

[0047] The enameled coil 7 can select a sinusoidal current as an excitation signal to prevent temperature drift from causing unnecessary influence on the system measurement results.

[0048] In one example, see Figure 2 There is a cone between the bottom and the top of the slurry collecting tray 4 at a certain distance. The cone is hollow, and the drill rod 3 of the drilling rig passes through the middle. The top of the cone fits tightly with the drill rod 3 but does not fit, so it does not affect the rotation of the drill rod 3.

[0049] In one example, see Figure 3 The data measurement and processing device 10 specifically includes: a single chip microcomputer, a first processing circuit, a second processing circuit and a display circuit.

[0050] 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 to output a square wave signal; the first processing circuit is used to convert the square wave circuit into a sinusoidal current excitation signal; the coil sensor is used to detect the voltage of the slurry when it flows under the excitation of the sinusoidal current excitation signal to obtain a sensor voltage.

[0051] The input end of the second processing circuit is respectively connected to 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 to the input end of the single-chip microcomputer; the output end of the single-chip microcomputer is also connected to the display circuit; the second processing circuit is used to amplify and convert 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 to calculate the inductance value of the coil sensor according to the processed internal resistance voltage and the processed sensor voltage, and determine the content of magnetic minerals in the slurry according to the inductance value. The display circuit is used to display the content of magnetic minerals in the slurry. Among them, the inductance value of the sensor can be obtained by the phase ratio of the processed internal resistance voltage and the processed sensor voltage.

[0052] Specifically, the model of the single-chip microcomputer can be a PIC16F877 single-chip microcomputer, which is an 8-bit single-chip microcomputer, adopts a reduced instruction set Harvard structure, a two-stage pipeline instruction fetching method, the crystal oscillator frequency can reach 20MHz, the execution time of a unit cycle instruction can reach 200ms, and it contains peripheral resources such as FLASH, EEPROM, PWM output, IIC interface, etc. It has the characteristics of low price, simplified instruction set, low power consumption, etc., and is suitable for use in industrial sites.

[0053] Specifically, the first processing circuit includes: a bandpass filtering circuit and a voltage-current conversion circuit.

[0054] The output end of the single-chip microcomputer is connected to the input end of the voltage-current conversion circuit through the bandpass filter circuit; the output end of the voltage-current conversion circuit is connected to the input end of the coil sensor; the bandpass filter circuit is used to adjust 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.

[0055] Specifically, the second processing circuit includes: a phasor voltage measurement circuit, a voltage shift circuit and an analog-to-digital conversion circuit.

[0056] The input end of the phasor voltage measurement circuit is connected to the input end of the coil sensor and the output end of the coil sensor respectively; the output end of the phasor voltage measurement circuit is connected to the input end of the voltage shift circuit; the output end of the voltage shift circuit is connected to the input end of the analog-to-digital conversion circuit; the output end of the analog-to-digital conversion circuit is connected to the input end of the single-chip microcomputer.

[0057] 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 convert the resistance phasor voltage and the sensor phasor voltage to a set voltage range (such as 0-5V) to obtain the converted resistance phasor voltage and the converted sensor phasor voltage to meet the voltage requirements of the analog-to-digital conversion circuit for the input signal; 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 to achieve the purpose of digital sampling of the measurement signal.

[0058] In one example, the phasor voltage measurement circuit uses an AD632 amplifier, which precisely amplifies the internal resistance voltage of the coil sensor and the sensor voltage, while suppressing interference signals to obtain high-quality resistance phasor voltage and sensor phasor voltage.

[0059] In one example, the drilling rig is equipped with a punching device and a flushing pipe 2 during production, wherein the punching device is located at the drill bit 1; the flushing pipe 2 is arranged inside the drill rod 3; the flushing pipe 2 is connected to the flushing device. The flushing device is used to flush the slurry at the drill bit 1 so that the slurry flows along the drill rod 3 into the slurry collecting tray 4.

[0060] In one example, the magnetic mineral detection device further includes: a fixed bracket 11; one end of the fixed bracket 11 is supported on the ground, and the other end is supported on the slurry collection tray 4 and the coil sensor to fix these instruments.

[0061] In one example, the drilling monitoring system may be a DPM type drilling process monitoring system.

[0062] The drilling monitoring system is connected to the data measurement and processing instrument; the drilling monitoring system is used to measure the drilling displacement and drilling torque of the drill rod 3; the data measurement and processing instrument is used to determine the ore body information according to the content of magnetic minerals in the ore slurry, the drilling position and the drilling torque; the ore body information at least includes the location of the gangue, the boundary of the ore body and the thickness of the ore body. The display circuit in the data measurement and processing instrument is also used to display the ore body information.

[0063] At present, the DPM type drilling process monitoring system is equipped with a distance sensor: it is used to monitor the position of the drilling rig power slide body 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 drilling depth of the down-the-hole hammer. The present invention preferably replaces it with a laser displacement sensor 13 to match the rock drilling rig, and matches the torque sensor 16 in the system.

[0064] For details, see Figure 4 The drilling monitoring system specifically includes: a laser displacement sensor 13 and a torque sensor 16. The laser displacement sensor 13 is used to emit a laser to irradiate one end of the drill rod propulsion device, and the irradiation point is the standard target bull's eye 14, which is specifically located on the power head auxiliary device 15 at the end of the drill rod 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 drilling torque of the drill rod 3.

[0065] In practical applications, the laser displacement sensor 13 is located at the bottom of the drill rod propulsion device and fixed to the fixed base 12 dedicated to the rock drilling trolley to monitor the drilling displacement in real time and record the drilling time for calculating the drilling rate. Since 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 assist the device to accurately record the location of the gangue in the ore body and the boundary of the ore body.

[0066] The selected DPM 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 drill bit 1 speed to be constant so as to monitor the drilling rate and drilling torque of the drilling rig. The reason is that among the vast amount of measurement parameters, the drill bit 1 speed and the drilling pressure are independent parameters and are not affected by the lithology of the drilled rock mass, while the rotational torque and the drilling rate are 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 principle that the influencing parameters measured by the sensor respond differently to different mechanical properties of the rock, ore body identification can be carried out.

[0067] One end of the laser displacement sensor 13 is fixed on a dedicated fixed base 12, and is matched with different structural trolleys according to actual conditions, and the laser irradiation is perpendicular to the drill rod propulsion device.

[0068] The torque sensor 16 is a shaft with two cylindrical ends, 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.

[0069] In one example, the drilling monitoring system further includes: a data processing system. The data processing system is connected to the laser displacement sensor 13 and the torque sensor 16 respectively; 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.

[0070] The laser displacement sensor 13 and the torque sensor 16 are both connected to the data recorder via the connecting line 9. The data recorder can be connected to the data processing system via a data adapter line. The data processing system can be a computer terminal to realize data display and processing.

[0071] The device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas according to this embodiment has the following advantages:

[0072] (1) Real-time monitoring of the content and occurrence state of magnetic minerals can accurately delineate the boundaries of the ore body, provide on-site guidance for blasting parameter design, and reduce unnecessary drilling length, which can significantly reduce drilling costs, improve work efficiency, and reduce ore depletion caused by breaking rocks outside the ore body due to excessively long blastholes, significantly reducing ore transportation costs and mineral processing costs.

[0073] (2) On-site real-time monitoring of the content and occurrence state of magnetic minerals saves man-hours and greatly reduces time costs compared to offline sampling detection.

[0074] A more specific implementation is given below to further illustrate the above embodiment.

[0075] The magnetic mineral detection device and the drilling monitoring system start measurement synchronously.

[0076] 1. Magnetic mineral detection device

[0077] like Figure 1 and Figure 2 As shown, the magnetic mineral detection device includes a slurry collecting tray 4, a coil sensor, a data measuring and processing instrument 10 and a fixed bracket 11, etc. The drill rod 3 of the drilling rig passes through the slurry collecting tray 4, and the slurry collecting tray 4, the coil sensor connecting pipe, and the coil sensor are firmly supported by the fixed bracket 11. The middle part of the coil sensor is connected to the data measuring and processing instrument 10 through a connecting line 9, and the instrument is reset to zero to prepare for measurement work.

[0078] The drilling rig drills an upward blasthole, and a flushing device for flushing drill cuttings is provided at the drill bit 1. The flushed slurry flows along the drilled blasthole into the slurry collecting tray 4 at the bottom of the drill rod 3. The slurry passes through the coil sensor at a uniform speed through the connecting pipe 5, and the measuring system starts working and records in real time.

[0079] 1) Working principle of the detection device:

[0080] When the slurry containing ferromagnetic minerals dynamically passes through the glass fiber reinforced plastic tube 8 of the coil sensor, only the magnetic heavy medium will cause the coil inductance value to change, while other components will not cause the inductance value to change. By detecting its inductance value in real time, the purpose of real-time detection of the magnetic heavy medium content value can be achieved.

[0081] 2) Detection principle:

[0082] 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 magnetic permeability μ 0 The magnetic permeability is affected by the content of magnetic material in the glass fiber reinforced plastic tube 8, and other material components will not cause its value to change. Therefore, the more magnetic material content, the greater the magnetic permeability and the greater the inductance value.

[0083] L=μ 0 N 2 S / l (1)

[0084] When the suspension flows through the glass fiber reinforced plastic tube 8 of the coil sensor, the content of the ferromagnetic heavy medium affects the size of the sensor inductance value L, which can be deduced according to Lenz's law:

[0085]

[0086] i represents the induced current, t represents the time. From formula (1) and formula (2), it can be seen that the sensor voltage V1 changes with the change of the magnetic content in the tube. The higher the content, the higher the voltage. Therefore, the coil sensor voltage value can reflect the change of the magnetic content in the glass fiber reinforced plastic tube 8.

[0087] 3) Introduction to the working process of the detection device:

[0088] a. First, the excitation signal is generated by the single-chip microcomputer control and applied to the coil sensor, and an induced electromotive force is generated at both ends of the coil sensor. 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 stable and reliable square wave signal with a value of 100Hz is generated by the single-chip microcomputer. The signal is then adjusted by filtering, and the sinusoidal voltage signal of the corresponding frequency is obtained after adjustment by the active filter circuit. The sinusoidal voltage excitation signal is converted into a sinusoidal current excitation signal through the voltage-current conversion circuit, with an amplitude of about 20mA.

[0089] b. Measure the coil sensor voltage value and send it to the microcontroller. Through the phasor voltage measurement circuit, voltage translation circuit, and AD conversion circuit, the sensor voltage V1 and the internal resistance voltage V2 can be measured. According to the ferromagnetic mineral content measurement principle, the sensor inductance value can be obtained by collecting the phasor ratio of the sensor voltage V1 and the internal resistance voltage V2 signals.

[0090] c. The inductance of the coil sensor is obtained through relevant calculations. The inductance value is proportional to the content of ferromagnetic minerals, and the corresponding magnetic mineral content can be known, which is displayed in the format of time-relative value of magnetic content. Due to synchronous work, the recorded time can correspond to the time recorded in the DPM drilling monitoring system. The drilling displacement can be corresponded to the magnetic content in the slurry through time, so as to accurately match the magnetic content value to the specific position in the ore body.

[0091] 2. Borehole monitoring system

[0092] The borehole monitoring system is implemented based on the iron ore body identification method of drilling parameters.

[0093] like Figure 4 As shown, taking a certain type of rock drilling trolley as an example, the drilling monitoring system is matched with the rock drilling equipment. For other rock drilling equipment, it can also be installed according to actual conditions. The monitoring system uses supporting devices including laser displacement sensor 13, torque sensor 16, data recorder, and computer. One end of the laser displacement sensor 13 is fixed on a dedicated fixed base 12, and it is matched with trolleys of different structures according to actual conditions. The laser irradiation is perpendicular to the drill rod propulsion device. The torque sensor 16 is a cylindrical shaft at both ends, which is installed between the drill rod 3 and the power head connecting rod 17. 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 is connected to the computer through the data adapter line. The rock drilling equipment is started, and the parameters of the rock drilling equipment are set, that is, the drilling pressure and the speed of the drill bit 1 are controlled to be constant, and the drilling monitoring system is started to collect drilling parameters.

[0094] Measuring principle:

[0095] The mechanical properties of rock are obviously different from those of iron ore, and the RQD value of rock is much smaller than that of iron ore. The drilling torque and drilling rate are influencing parameters, and their magnitude is affected by the mechanical properties of rock. According to the principle that the influencing parameters respond differently to different mechanical properties of rock, ore body identification can be performed. 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 threshold value of the change of the drilling rate and drilling torque of the iron ore body is clarified, it can be determined that the drill has crossed the boundary between the ore body and the rock body or crossed the gangue in the ore body. At this time, the data measured by the laser displacement sensor 13 is recorded, that is, the specific height of the ore-rock boundary or the gangue in the borehole.

[0096] The present invention breaks through the existing offline detection method and traditional prospecting method, overcomes the technical defects of being unable to obtain the magnetic mineral content in real time for grade zoning, being unable to accurately delineate the thickness of the ore body, and being unable to accurately detect the location of the interlayer of gangue, and provides a detection device for timely detecting the content and occurrence state of magnetic materials in the flushing slurry during the drilling process of the rock drilling trolley at a mining site. The device is intended to combine the magnetic mineral detection device with the drilling monitoring system realized by the iron ore body identification method based on the drilling parameters, so as to achieve the purpose of on-site real-time monitoring, save time cost, accurately determine the thickness and boundary of the ore body, clarify the location of the interlayer of gangue, reduce ore depletion, and greatly reduce the cost of drilling, ore transportation, and ore dressing. Among the two sets of monitoring equipment supporting the detection device, the magnetic mineral detection device is the main one, and the drilling monitoring system is the auxiliary one. The two are compared and improved with each other, which further improves the detection accuracy.

[0097] Specifically, the magnetic mineral detection device is combined with the drilling monitoring system to record the drilling displacement and drilling time in real time. The displacement can correspond to the content data measured in the on-site real-time detection device of the ferromagnetic mineral content of the slurry, so that the drilling 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 principle that the drilling torque and the drilling rate respond differently to different rock mechanical properties, the accurate position of the magnetic ore body can be further identified. The identification results of the two systems are compared with each other, which can further improve the accuracy and stability of the invention, so that the invention can quickly and in real time obtain the specific position of the interlayer of the ore layer and the specific thickness of the ore body, reducing the time cost, drilling cost and blasting cost of mining activities. Secondly, it is of great significance to prospecting and precise ore placement engineering, thereby reducing the cost of transporting raw ore and the cost of mineral processing.

[0098] The device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas while drilling of the present invention also has the following advantages:

[0099] (1) Accurately detect the location of the gangue in the ore body and reasonably match the explosives to the gangue, which can avoid the increase in blasting costs caused by excessive crushing of the gangue.

[0100] (2) Ore grade division is carried out to guide ore discharge. The gangue and ore are discharged separately, which can greatly reduce the mixing of ore and gangue, thereby reducing the ore transportation cost and mineral processing cost.

[0101] (3) During the drilling process, accurate identification of geological disaster areas is carried out, and reasonable support is provided to the weak roof in a timely manner to reduce safety hazards and minimize the occurrence of disasters.

[0102] In addition, according to calculations, the cost of transporting and beneficiating raw ore is about 50 yuan / t. If the gangue is effectively eliminated, the cost of ore transportation and beneficiation can be saved by about 20 yuan / t, which can save huge costs for the enterprise. And the rock drilling blasthole can be achieved with a hole of 2m, which meets the standards for establishing a refined and transparent mine.

[0103] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0104] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the device and its core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas while drilling, characterized in that: include: Magnetic mineral detection devices and borehole monitoring systems; The magnetic mineral detection device comprises: a slurry collection tray, a coil sensor and a data measurement processor; The slurry collection tray is sleeved on the drill rod of the drilling rig; the slurry collection tray is used to collect the slurry flowing into the target ore body from the drill bit of the drilling rig along the drill rod; the slurry collection tray is connected to the inside of the coil sensor; the coil sensor is used to detect the voltage when the slurry flows to obtain the sensor voltage; the data measurement processor is connected to the coil sensor; the data measurement processor is used to calculate the inductance value of the coil sensor according to the sensor voltage, and determine the content of magnetic minerals in the slurry according to the inductance value; The drilling monitoring system is used to measure the drilling displacement and drilling torque of the drill rod, and calculate the drilling rod advancement speed according to the relationship between the drilling displacement and time, and determine the occurrence state of the target ore body according to the drilling rod advancement speed and the drilling torque; the occurrence state at least includes the ore body thickness, the location of the gangue and the ore body boundary; The coil sensor specifically comprises: a glass fiber reinforced plastic tube, an enameled coil and a magnetic sleeve; The enameled coil is wound around the outside of the FRP pipe; the magnetic sleeve is sleeved on the outside of the enameled coil; one end of the FRP pipe is connected to the slurry collecting tray; the enameled coil is connected to the data measuring and processing instrument; the enameled coil is used to detect the sensor voltage when the slurry flows in the FRP pipe, and send the sensor voltage to the data measuring and processing instrument; The magnetic mineral detection device further includes: a connecting pipe; A through hole is provided on the slurry collecting tray; and the connecting pipe is used to connect the through hole with the glass fiber reinforced plastic pipe.

2. The device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas according to claim 1, characterized in that: The drilling monitoring system specifically includes: a laser displacement sensor and a torque sensor; The laser displacement sensor is used to emit laser to illuminate one end of the drill rod propulsion device; the other end of the drill rod propulsion device is connected to one end of the power head connecting rod; the other end of the power head connecting rod is connected to the drill 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 drilling torque of the drill rod.

3. The device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas according to claim 2, characterized in that: The drilling monitoring system further includes: a data processing system; The data processing system is connected to the laser displacement sensor and the torque sensor respectively; the data processing system is used to calculate the drill rod advancement speed according to the relationship between the drilling displacement and time, and determine the occurrence state of the target ore body according to the drill rod advancement speed and the drilling torque.

4. The device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas while drilling according to claim 1, characterized in that: The data measurement and processing instrument specifically comprises: a single chip computer, 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 to output a square wave signal; the first processing circuit is used to convert the square wave circuit into a sinusoidal current excitation signal; the coil sensor is used to detect the voltage of the slurry when it flows under the excitation of the sinusoidal current excitation signal to obtain a sensor voltage; The input end of the second processing circuit is respectively connected to 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 to the input end of the single-chip microcomputer; the second processing circuit is used to amplify and convert 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 to calculate the inductance value of the coil sensor according to the processed internal resistance voltage and the processed sensor voltage, and determine the content of magnetic minerals in the slurry according to the inductance value.

5. The device for real-time detection of the occurrence status of magnetic ore bodies in underground mining areas according to claim 4, characterized in that: The first processing circuit specifically includes: a bandpass filtering circuit and a voltage-current conversion circuit; The output end of the single chip microcomputer is connected to the input end of the voltage-current conversion circuit through the bandpass filter circuit; the output end of the voltage-current conversion circuit is connected to the input end of the coil sensor; The bandpass filter circuit is used to adjust 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.

6. The device for real-time detection of the occurrence state of magnetic ore bodies in underground mining areas while drilling according to claim 4, characterized in that: 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 connected to the input end of the coil sensor and the output end of the coil sensor respectively; the output end of the phasor voltage measurement circuit is connected to the input end of the voltage shift circuit; the output end of the voltage shift circuit is connected to the input end of the analog-to-digital conversion circuit; the output end of the analog-to-digital conversion circuit is connected to 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 convert the resistance phasor voltage and the sensor phasor voltage into a set voltage range to obtain the converted resistance phasor voltage and the converted sensor phasor voltage; 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.

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