A zero-spark safety control method and storage medium for mining cable drill rods

Abstract

A zero-spark safety control method and storage medium for a mining cable-operated drill pipe, belonging to the field of downhole drilling technology, includes a control unit, a low-voltage detection branch, a high-voltage power branch, and a cable-operated drill pipe. The output terminals of the low-voltage detection branch and the high-voltage power branch are connected in parallel to the power supply line of the cable-operated drill pipe. The output current of the low-voltage detection branch is controlled by the control unit to be in the microampere range. The high-voltage power branch is driven by the control unit through a controllable switching element, so that the control unit can smoothly increase the actual output voltage from zero volts to the working voltage in a soft-start manner. The control unit performs the following steps: using the low-voltage detection branch, if valid identification data is read and the measured impedance characteristic parameters meet the preset conditions, and a command to open the high-voltage power branch is received, the high-voltage power branch is turned on. The above technical solution ensures "zero spark" throughout the entire downhole connection process, significantly improving the safety of operations in high-gas environments.

Description

Technical Field

[0001] This application relates to the field of downhole drilling technology, specifically to a zero-spark safety control method and storage medium for a mining cable drill rod. Background Technology

[0002] In downhole drilling operations, cabled drill pipes (composed of drill pipe sections connected together with built-in communication cables) often need to be connected to depths of thousands of meters. Their long-distance power supply circuits exhibit significant inductive characteristics. During the insertion or removal of drill pipe sections, the high-inductance circuit generates a large back electromotive force due to sudden current changes. This can cause violent electrical sparks at the metal interface. When the underground gas concentration exceeds the standard, such sparks can easily ignite the gas, causing a serious explosion. Summary of the Invention

[0003] In view of the above problems, this application provides a zero-spark safety control method and storage medium for mine cable drill rods, which solves the problem that violent electric sparks are easily generated when inductive circuits are plugged in under high gas conditions.

[0004] To achieve the above objectives, the inventors provide a zero-spark safety control method for a mining cable-operated drill rod, comprising a control unit, a low-voltage detection branch, a high-voltage power branch, and a cable-operated drill rod; the output terminals of the low-voltage detection branch and the high-voltage power branch are both connected in parallel to the power supply line of the cable-operated drill rod; the low-voltage detection branch is controlled by the control unit through a current-limiting resistor to keep the output current at the microampere level; the high-voltage power branch is driven by the control unit through a controllable switching element, so that the control unit can smoothly increase the output voltage from zero volts to the working voltage in a soft-start manner;

[0005] The control unit performs the following steps during execution:

[0006] Use a weak current detection branch to read the identification data and measured impedance characteristic parameters of the sensor at the end of the cable drill rod;

[0007] If valid identification data is read, and the measured impedance characteristic parameters meet the preset conditions, and a high-voltage power branch opening command is received, then the high-voltage power branch is turned on through a controllable switching element.

[0008] Furthermore, the controllable switching element is a controlled DC-DC converter or a high-power MOSFET.

[0009] Furthermore, the control unit smoothly increases the voltage from zero volts to the operating voltage according to a preset S-shaped boost curve.

[0010] Furthermore, the upward slope of the S-shaped voltage rise curve is dynamically compensated based on the inductance calculated from the current number of drill pipe sections in the cable-connected drill pipe.

[0011] Furthermore, the upward slope of the S-shaped voltage rise curve is dynamically compensated based on the inductance calculated from the current number of drill pipe sections in the cable-connected drill pipe, including the following steps:

[0012] Get the number of drill pipe sections ;

[0013] like The rise time of the voltage smoothly rising from zero volts to the operating voltage. ;

[0014] like The rise time of the voltage smoothly rising from zero volts to the operating voltage. ;

[0015] like The rise time of the voltage smoothly rising from zero volts to the operating voltage. .

[0016] Furthermore, during the process of the output voltage smoothly rising from zero volts to the operating voltage, the rate of change of current is monitored in real time. If the rate of change of current exceeds a preset range, the high-voltage power branch is shut off.

[0017] Furthermore, the preset conditions include one or more of the following:

[0018] The difference between the measured impedance value and the theoretical impedance value exceeds the preset range;

[0019] The measured impedance dynamic fluctuation rate did not exceed the preset range.

[0020] Furthermore, the theoretical impedance value is:

[0021] ;

[0022] in, Indicates the number of drill pipe sections; Indicates the resistance of the internal cables of a single drill pipe section; This indicates the equivalent internal resistance of the downhole probe.

[0023] If

[0024] ;

[0025] The difference between the measured impedance value and the theoretical impedance value exceeds the preset range.

[0026] Furthermore, during the period of conducting the high-power circuit, it also includes real-time monitoring of the sensor "heartbeat packets" and bit error rate;

[0027] If the heartbeat is abnormal or the bit error rate suddenly increases, it is determined that the physical connection is unstable, and the high-voltage power branch is shut off by a controllable switching element.

[0028] A storage medium storing a computer program, which, when executed by a processor, implements the zero-spark safety control method for the mining cable drill rod.

[0029] Unlike existing technologies, the above-mentioned technical solution uses only a weak current detection branch in the initial stage of insertion. The microampere-level current energy output by this branch is extremely low. Even if there is a momentary interruption or contact vibration during the insertion process, it is still far below the gas ignition threshold and will not generate sparks. It is also sufficient to activate the communication chip inside the sensor at the end of the drill pipe to perform security verification of identity data and impedance characteristics. After the verification is passed, the physical contact is in a completely static and stable locked state. Only when a manual trigger command is received can the high-power branch be opened. Since there is no air gap between the contacts, there will be no electric sparks generated by the electric field breaking down the air gap during the voltage rise process, completely eliminating insertion sparks. It realizes the timing control of "logic identification first, then safe power-on", ensuring "zero sparks" throughout the entire downhole insertion process and significantly improving the safety of operation in high gas environments.

[0030] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0031] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of the present invention and other related contents, and should not be considered as limitations on this application.

[0032] In the accompanying drawings of the instruction manual:

[0033] Figure 1 A schematic diagram of the zero-spark safety control module for a mining cable drill rod as described in a specific embodiment;

[0034] Figure 2 This is a schematic diagram of the zero-spark safety control process for a mining cable drill rod as described in a specific implementation.

[0035] The reference numerals used in the above figures are explained as follows:

[0036] 10. Control unit;

[0037] 20. Low-voltage detection branch;

[0038] 30. High-voltage power branch circuit;

[0039] 40. Cable-connecting drill rod. Detailed Implementation

[0040] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0041] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0042] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0043] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0044] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0045] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0046] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0047] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] The processor described in the embodiments of this application can be implemented by hardware, firmware, software, or a combination thereof. It can be a circuit, one or more of an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field-programmable gate array (FPGA), a central processing unit (CPU), a controller, a microcontroller, or a microprocessor. It also includes other physical, biological, or chemical structures that can implement the same or equivalent functions as the processors listed above, such as biological neurons, quantum computing units, DNA computing units, etc., so that the processor can execute some or all of the steps in the computer program or method involved in the various embodiments of this application, or any combination of the steps mentioned therein.

[0049] The computer program involved in the embodiments can be stored in a computer device readable storage medium, which includes, but is not limited to, disks, magnetic tapes, magnetic cards, floppy disks, flash memory, optical disks, optical cards, read-only memory (ROM), random access memory (RAM), erasable programmable ROM (EPROM), and electrically erasable programmable ROM (EEPROM), etc., and also includes other biological, physical, or chemical structures that can achieve the same or equivalent functions as the storage media listed above, such as DNA, RNA, proteins, and other units with information storage capabilities. In specific embodiments, the storage medium involved can be one of the above-mentioned media types, or a combination of the above-mentioned media types. In different embodiments, the computer program involved in the embodiments can be centrally stored in a single medium, or distributed and stored in multiple media. The memory containing the computer device readable storage medium can be non-volatile memory or random access memory. These computer device readable storage media can be built into the device, or can be connected to the device involved in the embodiments as an external device or part of an external device. In some embodiments, the memory having a computer device readable storage medium is deployed locally; in other embodiments, the memory may be deployed remotely from the processor, for example, as a network-attached memory accessed via RF circuitry or an external port and a communication network, wherein the communication network may be the Internet, one or more intranets, a local area network (LAN), a wide area network (WLAN), a storage area network (SAN), or a suitable combination thereof, as long as computer device access to the memory is enabled. Furthermore, the computer program involved in the embodiments may be stored in plaintext / ciphertext form, or it may be designed as training data, integrated and recombined through model training and implicitly stored in the parameter states of a deep neural network or other machine learning model.

[0050] A zero-spark safety control method for mine-use cable-operated drill pipes utilizes only a low-voltage detection branch 20 during the initial insertion phase to acquire the drill pipe's identification data and measured impedance characteristics. The microampere-level current output of this branch is extremely low, insufficient to drive high-power equipment, but enough to activate the communication chip inside the sensor at the drill pipe end, completing identification and impedance detection. Even if momentary interruptions or contact vibrations occur during insertion, this microampere-level current remains far below the gas ignition threshold, preventing spark generation. Subsequently, the identification data and impedance characteristics are verified for safety. After successful verification, the physical contacts are in a completely static and stable locked state. Only upon receiving a manual trigger command can the high-voltage power branch 30 be opened. Because there is no air gap between the contacts, the voltage rise process will not generate electric sparks due to the electric field breaking down the air gap, completely eliminating insertion sparks. This method achieves a "logic identification first, then safe energization" timing control, ensuring "zero sparks" throughout the entire underground insertion process and significantly improving operational safety in high-gas environments.

[0051] See below Figures 1-2 As shown, this application provides a specific embodiment of a zero-spark safety control method for a mining cable drill rod, which includes a control unit 10, a low-voltage detection branch 20, a high-voltage power branch 30, and a cable drill rod 40; the output terminals of the low-voltage detection branch 20 and the high-voltage power branch 30 are both connected in parallel to the power supply line of the cable drill rod 40; the low-voltage detection branch 20 is controlled by the control unit 10 through a current-limiting resistor to keep the output current at the microampere level; the high-voltage power branch 30 is driven by the control unit 10 through a controllable switching element to allow the control unit 10 to smoothly increase the output voltage from zero volts to the working voltage in a soft-start manner;

[0052] When the control unit 10 executes, it performs the following steps:

[0053] Use the weak current detection branch 20 to read the identification data and measured impedance characteristic parameters of the sensor at the end of the cable drill rod 40;

[0054] If valid identification data is read, and the measured impedance characteristic parameters meet the preset conditions, and an opening command for the high-voltage power branch 30 is received, then the high-voltage power branch 30 is turned on through the controllable switching element.

[0055] The aforementioned low-voltage detection branch 20 includes a current-limiting resistor, a detection and feedback loop, etc. The current-limiting resistor is connected in series in the output loop, converting the output current into microamperes. This is sufficient to activate the drill pipe end sensor and obtain connection status information. Specifically, the current-limiting resistor value can be between tens of kilohms and hundreds of kilohms, so that the output current is usually in the range of 1μA to 500μA. This current energy is far lower than the minimum ignition energy of methane gas (approximately 280μJ), and even in the case of contact jitter, momentary on / off, or incomplete connection, it will not generate an electric spark sufficient to ignite the methane gas. The detection and feedback loop is used to feed back the actual current value or contact voltage flowing in the loop to the control unit 10 so that it can calculate the measured impedance characteristics. In some embodiments, the low-voltage detection branch 20 is also equipped with a controllable switching element. Specifically, an electronic switch (such as a small-signal MOSFET) controlled by the control unit 10 is connected in series at the output end of the low-voltage detection branch 20. This electronic switch is only turned on during the low-voltage detection operation and remains in the off state under other operating conditions. This setting enables complete electrical isolation of the weak current detection branch 20 during the operation of the high-voltage power branch 30, effectively preventing backflow of high voltage and electromagnetic signal interference.

[0056] The aforementioned high-power branch 30 includes a controllable switching element; the control terminal of the controllable switching element is connected to the control unit 10 through the pulse width modulation output interface of the control unit 10, thereby enabling the control unit 10 to precisely adjust and control the output voltage / current. In some embodiments, the controllable switching element is a controlled DC-DC converter. The controlled DC-DC converter integrates a programmable soft-start function. The control unit 10 can achieve a smooth rise in output voltage from zero simply by enabling or using the reference voltage pin. It also has overcurrent limiting, short-circuit shutdown, and overheat protection functions. When an abnormal overload or partial short circuit occurs in the drill pipe circuit, the converter can quickly self-protect without additional monitoring by the control unit 10. In some embodiments, the controllable switching element is a high-power MOSFET. The gate of the high-power MOSFET can be directly driven by the PWM signal of the control unit 10. It can adjust the duty cycle with microsecond-level precision, which facilitates a smooth voltage rise. This effectively suppresses the reverse electromotive force generated at the moment of switching on and off of the high-inductive circuit, eliminating sparks at the source. It can also complete the shutdown within nanosecond to microsecond time. When the control unit 10 detects a communication abnormality or needs to preemptively extinguish the arc, it can quickly cut off the high-voltage circuit, ensuring "zero current" disconnection before the power contacts are physically separated, and completely eliminating the pull-out arc.

[0057] The aforementioned cable-connected drill pipe 40 is a power supply and communication circuit formed by sequentially connecting several sections of drill pipe with built-in communication cables (such as single-core, double-core, or multi-core insulated wires). Its end has a sensor for measurement while drilling (MWD), including but not limited to: measuring geological and engineering parameters such as borehole inclination angle, azimuth angle, and tool face angle, and uploading the measurement data to the surface or downhole control unit 10 in real time through the built-in communication cable; at the same time, the sensor also stores a unique identification code (ID) and periodically emitted heartbeat packets for identification authentication during the weak current detection phase and connection status monitoring during operation.

[0058] The aforementioned control unit 10 includes peripheral interfaces such as a multi-channel signal acquisition interface and a pulse width modulation (PWM) output interface. The multi-channel signal acquisition interface is used to acquire the voltage and current signals returned by the weak current detection branch 20, calculate the measured impedance characteristics, read the sensor identification code, and receive the power supply branch 30 activation command. The PWM output interface is connected to the control terminal of the controllable switching element within the power supply branch 30, and by adjusting the PWM duty cycle, the output voltage is smoothly raised from zero volts to the rated operating voltage. In terms of timing control, the control unit 10 keeps the power supply branch 30 off by default, only enabling the weak current detection branch 20. When valid identification data is read and the measured impedance characteristic parameters meet preset conditions, and an activation command for the power supply branch 30 is received (such as a manual activation command), the control unit 10 conducts the power supply branch 30 through the controllable switching element. Specifically, the control unit 10 can be any one of an industrial-grade microcontroller (MCU), digital signal processor (DSP), or programmable logic device (FPGA).

[0059] The working principle of control unit 10 is as follows:

[0060] Initial state: The control unit 10 defaults to the power supply branch 30 being in the off state, that is, the power supply branch 30 is in the off state through the controllable switching element, so that the power supply branch 30 is physically isolated from the power supply line of the cable drill rod 40, ensuring that no live contact sparks will be generated no matter how the drill rod is inserted or removed; the weak current detection branch 20 is used to read the identification data and measured impedance characteristic parameters of the sensor at the end of the cable drill rod 40.

[0061] Activation conditions: The control unit 10 will only turn on the high-voltage branch through the controllable switching element after the identification code is successfully read in the low-voltage detection branch 20, the measured impedance characteristic parameters meet the preset conditions, and the high-voltage power branch 30 is received as the activation command.

[0062] Soft start process: The control unit 10 controls the output voltage of the high-voltage power branch 30 to rise smoothly from zero volts to the working voltage. Since the physical contacts are firmly locked at this time, the soft start process does not produce any physical gap breakdown, and completely eliminates sparks.

[0063] The purpose of the aforementioned high-voltage power branch 30 is to smoothly increase the output voltage from zero volts to the operating voltage, which is to suppress the back electromotive force generated by the sudden change in current during the energization of the highly inductive cable circuit. This completely eliminates electrical sparks. The output voltage of the high-voltage power branch 30 can be boosted according to a preset boosting method, such as an arc-shaped boost curve (the slope gradually increases from zero in the initial stage and then gradually returns to zero in the later stage), a stepped step, and an S-shaped curve; the S-shaped boost curve is preferred, as the slopes in both the initial and final stages are zero, avoiding high-voltage impacts on the circuit inductor and effectively eliminating the instantaneous overshoot and ringing phenomena common in inductive loads; at the same time, the S-curve reduces the rate of change of current. The continuous and controllable power supply makes the power supply start-up process of the long-distance cable drill rod 40 in high-gas environments more stable and spark-free.

[0064] In some embodiments, the rise slope of the output voltage of the high-power branch 30 can be dynamically compensated based on the inductance calculated from the current number of drill pipe sections of the cable-connected drill pipe 40. Specifically:

[0065] Total Inductance ;

[0066] The more drill pipe sections there are, the greater the total inductance of the circuit and the stronger the energy storage characteristics. To suppress the back electromotive force at the moment of energization, the voltage rise time needs to be extended accordingly; that is, the control unit 10 adjusts the voltage rise time based on the number of drill pipe sections obtained. (Read current meter counter data) and dynamically adapt to different voltage rise times (soft start time); specifically, the voltage rise time can be adjusted according to the number of drill pipe sections. Soft-starting of highly inductive circuits is performed using methods such as linear interpolation, piecewise laddering, exponential or logarithmic curves, and table lookup to ensure both safety and efficiency. The piecewise laddering method is used as an example, dividing the circuit into multiple intervals, with a fixed voltage rise time set for each interval. The process includes the following steps:

[0067] Get the number of drill pipe sections ;

[0068] like The rise time of the voltage smoothly rising from zero volts to the operating voltage. ;

[0069] like The rise time of the voltage smoothly rising from zero volts to the operating voltage. ;

[0070] like The rise time of the voltage smoothly rising from zero volts to the operating voltage. .

[0071] In some implementations, during the soft-start process where the output voltage smoothly rises from zero volts to the operating voltage, the control unit 10 can monitor the rate of change of the current in the high-power branch 30 in real time through a current sampling circuit. Because the 40-circuit cable drill pipe has significant inductive characteristics, if the current rise rate is too fast, an excessively high back electromotive force will be generated in the inductive circuit. This could potentially cause local insulation breakdown or generate potential sparks at the contact gaps. Therefore, the control unit 10 pre-sets a reasonable and safe preset range for the current change rate based on parameters such as the number of drill pipe sections and the operating voltage. During soft start-up, if the current change rate is detected to exceed this preset range, it indicates a possible abnormality in the cable-connected drill pipe 40 (such as a partial short circuit, poor contact leading to a sudden current change, or inductor saturation). The control unit 10 immediately shuts off the controllable switching element in the high-power branch 30, cutting off the output voltage. This suppresses further accumulation of inductor energy, preventing local breakdown, contact arcing, or spark discharge caused by sudden energy release, ensuring the safety of the equipment and the downhole environment.

[0072] The aforementioned measured impedance characteristic parameters may include measured impedance values, impedance dynamic fluctuation rate, etc., and the preset conditions include one or more of the following:

[0073] The difference between the measured impedance value and the theoretical impedance value exceeds the preset range;

[0074] The measured impedance dynamic fluctuation rate did not exceed the preset range.

[0075] The theoretical impedance value mentioned above:

[0076] ;

[0077] in, Indicates the number of drill pipe sections; Indicates the resistance of the internal cables of a single drill pipe section; This indicates the equivalent internal resistance of the downhole probe.

[0078] The preset range of the difference between the measured impedance value and the theoretical impedance value is based on the theoretical impedance value. Settings. This allows you to set the relative error between the measured impedance and the theoretical impedance to determine if there are any connection abnormalities (such as severe dust contamination, oxide layer, or incorrect connection); for example, if... If so, it is determined that the connection is abnormal.

[0079] The aforementioned measured impedance dynamic fluctuation rate is used to determine whether the physical connection is stably locked and whether there are transient changes caused by hand shaking or lack of locking. The measured impedance dynamic fluctuation rate can be calculated within a preset period by the standard deviation of multiple measured impedance values. This preset range can be comprehensively calibrated based on impedance stability under normal locking conditions, operational jitter amplitude, mechanical structure characteristics, circuit measurement noise, and safety redundancy coefficient. For example, within a 500ms detection period, if the standard deviation of multiple measured impedance values... The cause was determined to be operator hand movement or improper physical connection.

[0080] A jump packet is a short frame of data periodically sent by the sensor at fixed time intervals (e.g., every 100ms) to characterize normal power supply, smooth communication link, and stable physical connection of the interface. The bit error rate (BER) is used to quantify the proportion of bit transmission errors caused by factors such as contact micro-movement, mechanical vibration, and poor contact during transmission. When the drill pipe interface experiences slight displacement due to downhole vibration, human pulling, or mechanical loosening, although the high-voltage contacts may not be completely separated, the contact pressure of the signal contacts has changed, causing signal distortion or packet loss. Therefore, in some embodiments, during the period when the high-voltage power branch 30 is connected, the control unit 10 can also continuously monitor the "heartbeat packets" and communication BER periodically returned by the drill pipe end sensor. If the heartbeat packet is not received within the time limit or the BER suddenly increases (the BER can be set; if the BER exceeds a preset threshold, it is determined to be a sudden increase in the BER), the physical connection can be determined to be unstable before the power contacts physically separate. To prevent sparks from being generated, the control unit 10 immediately and quickly shuts off the high-power branch 30 via a controllable switching element, reducing the circuit current to zero. Utilizing the characteristic that signal transmission is more sensitive to micro-motions, it anticipates connection anomalies, suppresses spark generation, and ensures the safe disassembly of the long-distance cable-stayed drill pipe 40 in high-gas environments.

[0081] This application also provides a storage medium storing a computer program. When executed by a processor, the computer program implements the zero-spark safety control method for mining cable drill rods. When the computer program is executed by the processor, core functions such as weak current detection, impedance verification, manual trigger soft start, and active pre-power-off can be achieved without replacing the main hardware, greatly reducing the cost of downhole explosion-proof upgrades. Simultaneously, the method is solidified in a standardized software format, facilitating portability and mass production across different equipment models. Furthermore, when safety strategies are optimized or dynamic compensation algorithms are improved, only the program in the storage medium needs to be updated, without modifying any electrical circuits, making maintenance and upgrades flexible and convenient. In addition, by using software to implement logical judgments and curve generation, a more cost-effective general-purpose processor can be selected, reducing hardware specialization requirements. During program operation, it can also automatically record logs such as impedance, verification results, and climbing parameters, providing data support for equipment status traceability and downhole safety management.

[0082] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A zero-spark safety control method for mine cable-operated drill rods, characterized in that, It includes a control unit, a low-voltage detection branch, a high-voltage power branch, and a cable-connected drill rod; the output terminals of the low-voltage detection branch and the high-voltage power branch are both connected in parallel to the power supply line of the cable-connected drill rod; the low-voltage detection branch is controlled by the control unit through a current-limiting resistor to keep the output current at the microampere level. The high-voltage power branch is driven by the control unit through a controllable switching element, so that the control unit can smoothly increase the actual output voltage from zero volts to the working voltage in a soft-start manner. The control unit performs the following steps during execution: Use a weak current detection branch to read the identification data and measured impedance characteristic parameters of the sensor at the end of the cable drill rod; If valid identification data is read, and the measured impedance characteristic parameters meet the preset conditions, and a high-voltage power branch opening command is received, then the high-voltage power branch is turned on through a controllable switching element.

2. The zero-spark safety control method for mine cable-operated drill rods according to claim 1, characterized in that, The controllable switching element is a controlled DC-DC converter or a high-power MOSFET.

3. The zero-spark safety control method for mine cable-operated drill rods according to claim 1, characterized in that, The control unit smoothly increases the voltage from zero volts to the operating voltage according to the preset S-shaped boost curve.

4. The zero-spark safety control method for mine cable-operated drill rods according to claim 3, characterized in that, The upward slope of the S-shaped voltage rise curve is dynamically compensated based on the inductance calculated from the current number of drill pipe sections in the cable-connecting drill pipe.

5. The zero-spark safety control method for mine cable-operated drill rods according to claim 4, characterized in that, The upward slope of the S-shaped voltage rise curve is dynamically compensated based on the inductance calculated from the current number of drill pipe sections, including the following steps: Get the number of drill pipe sections ; like The rise time of the voltage smoothly rising from zero volts to the operating voltage. ; like The rise time of the voltage smoothly rising from zero volts to the operating voltage. ; like The rise time of the voltage smoothly rising from zero volts to the operating voltage. .

6. The zero-spark safety control method for mine cable-operated drill rods according to claim 4, characterized in that, During the process of the output voltage smoothly rising from zero volts to the operating voltage, the rate of change of current is monitored in real time. If the rate of change of current exceeds the preset range, the high-voltage power branch is shut off.

7. The zero-spark safety control method for mine cable-operated drill rods according to claim 1, characterized in that, The preset conditions include one or more of the following: The difference between the measured impedance value and the theoretical impedance value exceeds the preset range; The measured dynamic fluctuation rate of impedance did not exceed the preset range.

8. The zero-spark safety control method for mine cable-operated drill rods according to claim 7, characterized in that, The theoretical impedance value: ； in, Indicates the number of drill pipe sections; Indicates the resistance of the internal cables of a single drill pipe section; This indicates the equivalent internal resistance of the downhole probe. If ； The difference between the measured impedance value and the theoretical impedance value exceeds the preset range.

9. The zero-spark safety control method for mine cable-operated drill rods according to claim 1, characterized in that, During the period of conducting the high-power circuit, it also includes real-time monitoring of sensor "heartbeat packets" and bit error rate; If the heartbeat is abnormal or the bit error rate suddenly increases, it is determined that the physical connection is unstable, and the high-voltage power branch is shut off by a controllable switching element.

10. A storage medium storing a computer program that, when executed by a processor, implements the zero-spark safety control method for a mining cable drill rod according to any one of claims 1-9.

Images