Equipment and method for measuring torque and feed force while drilling

Abstract

The present invention discloses an apparatus and method for measuring torque and feed force while drilling, comprising a drill rod for measuring torque and feed force while drilling, a charging base and a signal processing device; during the drilling process of the drill bit, the drill rod for measuring torque and feed force while drilling acquires strain electrical signals in real time and transmits them wirelessly to the signal processing device, thereby obtaining in real time the torque and feed force borne by the drill rod during the drilling process; and the strain gauge is provided with a protective sleeve on the outside, which can effectively prevent the strain gauge from being impacted by broken rocks around the borehole, thereby ensuring the stable operation of the strain gauge; in addition, when the present invention completes the measurement work and needs to be charged, there is no need to remove the internal power supply, and the drill rod for measuring torque and feed force while drilling is placed on the charging base for wireless charging, thereby quickly realizing power replenishment without disassembly, and facilitating the efficient and stable use of the drill rod for measuring torque and feed force in the narrow working environment underground in coal mines.

Description

Technical Field

[0001] The invention relates to equipment and a method for measuring torque and feed force while drilling, belonging to the technical field of coal mine geological exploration drilling engineering. Background Art

[0002] Predicting the mechanical parameters of surrounding rock in underground engineering projects is fundamental for determining support parameters, grading surrounding rock, and analyzing surrounding rock stability. Conventional methods for determining rock mechanical parameters include laboratory testing and field testing. While these methods offer precise measurements, they require collecting and transporting rock samples to a laboratory for testing, which is time-consuming and labor-intensive, and the test results cannot be used to provide timely guidance for on-site engineering projects. Furthermore, the mechanical parameters of surrounding rock undergo significant changes after excavation disturbance, and the patterns of these changes significantly influence surrounding rock deformation and support stresses, but laboratory testing methods cannot provide timely evaluation of these changes. Consequently, field testing methods have garnered extensive attention and research. Since the drill rod's parameters change while drilling as it penetrates rock formations with varying mechanical properties, the response of these parameters to the mechanical properties of the rock formation can be explored. By collecting and analyzing these parameters during drilling, the rock mechanical properties of the drilled rock mass can be predicted in real time. The resulting measurement while drilling technology has achieved significant success in theory, experimentation, and field applications, and is widely used in geological exploration, tunneling, coal mining, and other fields.

[0003] Real-time acquisition, analysis, and analysis of drilling parameters are the prerequisite and foundation for predicting rock mass geological information. Existing research has found that drill pipe torque and feed force during drilling significantly affect mechanical parameters such as the uniaxial compressive strength of the rock mass. Dynamic changes in drill pipe torque and feed force can intuitively and accurately reflect changes in the mechanical properties of the drilled rock formation. Real-time monitoring of drill pipe torque and feed force is key to accurately predicting rock mass geological information.

[0004] Intelligent coal mine construction is a key technological advancement for coal enterprises' transformation and upgrading. Intelligent coal mine geological support systems are a fundamental component of this intelligent development, with the core goal of achieving transparency in mine geological information. Transparent geology relies on high-precision geological detection and monitoring technologies, necessitating the widespread adoption of intelligent detection and monitoring technology and equipment for simultaneous drilling, excavation, and drilling. While researchers have developed large-scale drilling equipment capable of simultaneously monitoring drill pipe torque and feed force, these are primarily used in tunneling and slope engineering projects and are not suitable for the confined working environments of underground coal mines. Existing measurement-while-drilling (MWD) equipment primarily relies on strain gauges for data acquisition, making timely repair and replacement difficult in the event of damage. Furthermore, MWD equipment relies primarily on internal batteries for power, requiring removal and replacement when power is low. This complicates the operation and impacts the continued use of the MWD equipment. Summary of the Invention

[0005] In response to the problems existing in the above-mentioned prior art, the present invention provides an apparatus and method for measuring torque and feed force while drilling, which is suitable for the narrow working environment underground in coal mines, can facilitate the maintenance of strain gauges, and can charge the battery without removing the battery, thereby ensuring the efficient and stable use of the measurement while drilling equipment.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: an apparatus for measuring torque and feed force while drilling, comprising a drill pipe for measuring while drilling, a charging base and a signal processing device;

[0007] The measurement while drilling drill pipe comprises a rod body strain section and a rod body main section, the rod body strain section is coaxially connected to the rod body main section, and the outer diameter of the rod body strain section is smaller than the outer diameter of the rod body main section, an annular groove is provided on the circumferential surface of the rod body strain section, and a strain gauge is installed in the annular groove for collecting axial strain data and radial strain data of the rod body strain section; a protective sleeve is sleeved on the rod body strain section and covers the annular groove for protecting the strain gauge; a switch compartment and a blocking wedge are provided at the connection between the rod body main section and the rod body strain section, and a magnetic switch is built into the switch compartment; a sealing wedge is provided at the connection between the rod body main section and the rod body strain section. The first blocking wedge is used to block the front end of the switch compartment; the main section of the rod body is provided with a receiving compartment and a second blocking wedge, the receiving compartment is equipped with an electronic circuit device for receiving data collected by the strain gauge and sending it to the signal processing device, the front end of the receiving compartment is connected to the rear end of the switch compartment, and the front end of the receiving compartment is provided with a wiring hole 1 for wiring; the second blocking wedge blocks the rear end of the receiving compartment, and a wireless charging receiving coil is provided inside the second blocking wedge, which is connected to the electronic circuit device and is used to charge the built-in power supply of the electronic circuit device during wireless charging;

[0008] The charging base is provided with a wireless charging transmitting coil. During wireless charging, the drill pipe of the measurement while drilling is installed on the charging base, and the wireless charging receiving coil is wirelessly powered by the wireless charging transmitting coil to charge the built-in power supply of the electronic circuit device.

[0009] The signal processing device communicates wirelessly with the electronic circuit device, is used to receive data fed back by the electronic circuit device, and obtain the real-time torque and feed force of the drill rod during the drilling process after processing the data.

[0010] Furthermore, screw holes are provided on the circumferential surface of the rod strain segment on both sides of the annular groove for installing fixing bolts to fix the protective sleeve on the rod strain segment; and waterproof glue is filled between the protective sleeve and the annular groove to prevent water from entering the annular groove and affecting the strain gauge.

[0011] Furthermore, the outer diameter of the protective sleeve is the same as the outer diameter of the main section of the rod body. This structure facilitates subsequent drilling.

[0012] Furthermore, the electronic circuit device includes a power supply, a voltage regulator, a signal receiving module, an operational amplifier module, a control module, a storage module, a magnetic switch and a communication module. The signal receiving module is connected to the strain gauge for receiving the real-time voltage signal transmitted by the strain gauge. The operational amplifier module is respectively connected to the signal receiving module and the control module for amplifying the voltage signal transmitted by the signal receiving module and transmitting it to the control module; the control module is respectively connected to the storage module and the communication module for sending the data to the signal processing device through the communication module and storing the data in the storage module at the same time; the power supply supplies power to the signal receiving module, the operational amplifier module, the control module, the storage module and the communication module through the voltage regulator; the magnetic switch is connected to the control module for controlling the opening and closing of the electronic circuit device.

[0013] Furthermore, a flow channel 1 is axially opened inside the rod strain section, and an annular flow channel 2 is axially opened inside the rod strain section around the accommodating chamber. The flow channel 2 is connected to the flow channel 1, and is used to supply water through the flow channel 1 and the flow channel 2 when the drill bit is drilling, so as to perform wet operations.

[0014] Furthermore, the ends of the rod strain section and the ends of the rod main section are both provided with connecting sections, which facilitate connection with a drill bit and other drill rods.

[0015] The above-mentioned working method for the equipment for measuring torque and feed force while drilling comprises the following specific steps:

[0016] A. First, connect the two ends of the MWD drill pipe coaxially to the drill bit and ordinary drill pipe respectively through the connecting section, and control the magnetic switch to the on state through the switch hole. At this time, the entire electronic circuit device is in the working state, and the wireless communication status between the signal processing equipment and the electronic circuit device is tested. The assembly and preparation of the MWD drill pipe are completed;

[0017] B. When construction begins, the drill pipe is drilled into the coal and rock mass along with the drill bit. Simultaneously, the strain gauges acquire electrical signals representing the axial and radial strains of the pipe segment in real time and feed them back to the electronic circuit device. The electronic circuit device wirelessly transmits this data to the signal processing device, which can then obtain the torque and feed force experienced by the drill pipe in real time during the drilling process.

[0018] C. After completing a drilling measurement, the measurement while drilling drill pipe and the drill bit are removed from the borehole together, and a switch device (i.e., a telescopic rod or a long thin rod with a magnetic block at the end) is extended from the flow channel at the front end of the drill pipe to the position of the blocking wedge. The magnetic switch is triggered by magnetic force to turn off the electronic circuit device. The measurement while drilling drill pipe is then placed on a charging base, and the charging base is connected to an external power source for wireless charging. At this time, the wireless charging receiving coil is wirelessly powered by the wireless charging transmitting coil to charge the built-in power supply of the electronic circuit device. After completion, the measurement while drilling drill pipe is used for the next drilling measurement.

[0019] Compared with the existing technology, the present invention combines a measurement while drilling drill pipe, a charging base and a signal processing device, which has the following advantages:

[0020] 1. The measurement-while-drilling drill rod of the present invention can obtain electrical signals representing the axial and radial strains of the rod body strain segment in real time through strain gauges during the drilling process of the drill bit. After wirelessly transmitting the electrical signals to the signal processing equipment through an electronic circuit device for processing, the torque and feed force borne by the drill rod during the drilling process can be obtained in real time. In addition, the protective sleeve outside the strain gauge can effectively prevent the impact of broken rocks around the borehole on the strain gauge during the drilling process, thereby ensuring the stable operation of the strain gauge.

[0021] 2. After completing a measurement while drilling, the present invention does not need to remove the internal power supply. The measurement while drilling drill rod only needs to be placed on the charging base. At this time, the wireless charging transmitting coil of the charging base wirelessly powers the wireless charging receiving coil to charge the built-in power supply of the electronic circuit device, thereby quickly realizing non-disassembly power replenishment, facilitating the efficient and stable use of the measurement while drilling drill rod in the narrow working environment of underground coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the measurement while drilling drill pipe in the present invention being inside a borehole;

[0023] Figure 2 is a schematic diagram of a signal processing device in the present invention;

[0024] Figure 3 This is a schematic diagram of the overall assembly and charging of the measurement while drilling drill pipe in the present invention;

[0025] Figure 4 Schematic diagram of the cross-sectional structure of the measurement while drilling drill pipe in the present invention;

[0026] Figure 5 Schematic diagram of the cross-sectional structure of the second blocking wedge in the present invention;

[0027] In the figure: 1. Rod body, 11. Connecting section, 12. Rod body strain section, 13. Rod body main section, 14. Overcurrent channel 1, 15. Wiring hole 2, 16. Switch compartment, 17. Wiring hole 1, 18. Accommodation compartment, 19. Overcurrent channel 2, 2. Protective sleeve, 3. Protective sleeve fixing bolt, 4. Strain gauge, 5. Sealing wedge 1, 6. Electronic circuit device, 7. Sealing wedge 2, 71. Wireless charging receiving coil, 100. Measurement while drilling drill pipe, 200. Drill bit, 300. Drill hole, 400. Coal rock mass, 500. Ordinary drill pipe, 600. Charging base, 700. Signal processing equipment. DETAILED DESCRIPTION

[0028] The present invention will be further described below.

[0029] Example: Figure 1 and 2 As shown, a device for measuring torque and feed force while drilling includes a drill rod 100 for measuring while drilling, a charging base 600 and a signal processing device 700;

[0030] like Figure 3 and 4 As shown, the measurement while drilling drill pipe 100 includes a rod body strain section 12 and a rod body main section 13. The rod body strain section 12 is coaxially connected to the rod body main section 13, and the outer diameter of the rod body strain section 12 is smaller than the outer diameter of the rod body main section 13. An annular groove is provided on the circumferential surface of the rod body strain section 12, and a strain gauge 4 is installed in the annular groove for collecting axial strain data and radial strain data of the rod body strain section 12; a protective sleeve 2 is sleeved on the rod body strain section 12 and covers the annular groove for protecting the strain gauge 5; protective sleeve fixing bolts 3 are provided on the circumferential surface of the rod body strain section 12 on both sides of the annular groove for fixing the protective sleeve 2 on the rod body strain section 12; and waterproof glue is filled between the protective sleeve 2 and the annular groove to prevent water from entering the annular groove and affecting the strain gauge 4; The outer diameter of the protective sleeve 2 is the same as the outer diameter of the rod body main section 13; a switch compartment 16 and a blocking wedge 5 are provided at the connection between the rod body main section 13 and the rod body strain section 12, and the switch compartment 16 has a built-in magnetic switch; the blocking wedge 5 is used to block the front end of the switch compartment 16; a accommodating compartment 18 with an open end and a blocking wedge 2 7 are provided in the rod body main section 13, and an electronic circuit device 6 is installed in the accommodating compartment 18 for receiving data collected by the strain gauge 4 and sending it to the signal processing device 700; the front end of the accommodating compartment 18 is connected to the rear end of the switch compartment 16, and a wiring hole 1 is provided at the front end of the accommodating compartment 18, and a wiring hole 2 is provided on the side of the switch compartment as needed, both of which are used for wiring; the blocking wedge 2 7 blocks the rear end of the accommodating compartment 18, and a wireless charging receiving coil 71 is provided inside the blocking wedge 2 7. Figure 5As shown, the wireless charging receiving coil 71 is connected to the electronic circuit device 6 and is used to charge the built-in power supply of the electronic circuit device 6 during wireless charging; the electronic circuit device 3 includes a power supply, a voltage regulator, a signal receiving module, an operational amplifier module, a control module, a storage module, a magnetic switch and a communication module. The signal receiving module is connected to the strain gauge and is used to receive the real-time voltage signal from the strain gauge. The operational amplifier module is respectively connected to the signal receiving module and the control module, and is used to amplify the voltage signal from the signal receiving module and transmit it to the control module; the control module is respectively connected to the storage module and the communication module, and is used to send the data to the signal processing device through the communication module and store the data in the storage module at the same time; the power supply supplies power to the signal receiving module, the operational amplifier module, the control module, the storage module and the communication module through the voltage regulator; the magnetic switch is connected to the control module and is used to control the opening and closing of the electronic circuit device; as shown Figure 4 As shown, a switch compartment 16 and a blocking wedge 5 are provided in the transition section between the rod body main section 12 and the rod body strain section 13, and the switch compartment 16 has a built-in magnetic switch.

[0031] The charging base 600 is provided with a wireless charging transmitting coil. During wireless charging, the measurement while drilling drill pipe 100 is mounted on the charging base 600, and the wireless charging transmitting coil wirelessly powers the wireless charging receiving coil 71 to charge the built-in power supply of the electronic circuit device 6.

[0032] like Figure 2 As shown, the signal processing device 700 communicates wirelessly with the electronic circuit device 3, is used to receive data fed back by the electronic circuit device 6, and obtain the real-time torque and feed force of the drill rod during drilling after processing the data.

[0033] As an improvement of the present invention, Figure 4 As shown, a flow channel 14 is axially opened inside the rod strain section 12, and an annular flow channel 2 19 is axially opened inside the rod strain section surrounding the accommodating chamber 18. The flow channel 2 19 is connected to the flow channel 14, and is used to supply water through the flow channel 14 and the flow channel 2 19 when the drill bit is drilling, so as to perform wet operation.

[0034] As another improvement of the present invention, both the end of the rod strain section 12 and the end of the rod main section 13 are provided with a connecting section 11 to facilitate connection with the drill bit 200 and other drill rods.

[0035] The above-mentioned power supply, voltage stabilizer, signal receiving module, operational amplifier module, control module, storage module, magnetic switch, communication module, wireless charging receiving coil 71, wireless charging transmitting coil and signal processing equipment are all existing devices and can be directly purchased on the market. The present invention only utilizes their existing functions.

[0036] The above-mentioned working method for the equipment for measuring torque and feed force while drilling comprises the following specific steps:

[0037] A. First, coaxially connect the two ends of the MWD drill rod 100 to the drill bit 200 and the ordinary drill rod 500 through the connecting section 11. Insert the switch rod from the front end of the drill rod through the flow channel 14 to trigger the magnetic switch. At this time, the entire electronic circuit device 3 is in operation. The wireless communication status between the signal processing device 700 and the electronic circuit device 3 is tested, completing the assembly and preparation of the MWD drill rod 100.

[0038] B. When construction begins, the drill rod 100, along with the drill bit 200, drills into the coal and rock mass 400. Simultaneously, the strain gauge 4 acquires, in real time, electrical signals representing the axial and radial strains of the rod body strain segment 12 and feeds these signals back to the electronic circuit device 6. The electronic circuit device 6 wirelessly transmits this data to the signal processing device 700, enabling the signal processing device 700 to obtain, in real time, the torque and feed force experienced by the drill rod during drilling.

[0039] C. After completing a drilling measurement, the measurement while drilling drill rod and the drill bit 200 are taken out of the borehole 400 together, and a switch device (i.e., a telescopic rod or a long thin rod with a magnetic block at the end) is extended from the flow channel 14 at the front end of the drill rod to the position of the blocking wedge 5, and the magnetic switch is triggered by magnetic force to turn off the electronic circuit device 6; then the measurement while drilling drill rod 100 is placed on the charging base 600, and the charging base 600 is connected to an external power source for wireless charging. At this time, the wireless charging receiving coil 71 is wirelessly powered by the wireless charging transmitting coil to charge the built-in power supply of the electronic circuit device 3; after completion, the measurement while drilling drill rod 100 is used for the next drilling 300 measurement.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for measuring torque and feed force while drilling, characterized in that: Includes measurement while drilling drill pipe, charging base and signal processing equipment; The measurement while drilling drill pipe comprises a rod body strain section and a rod body main section, the rod body strain section is coaxially connected to the rod body main section, and the outer diameter of the rod body strain section is smaller than the outer diameter of the rod body main section, an annular groove is provided on the circumferential surface of the rod body strain section, and a strain gauge is installed in the annular groove for collecting axial strain data and radial strain data of the rod body strain section; a protective sleeve is sleeved on the rod body strain section and covers the annular groove for protecting the strain gauge; a switch compartment and a blocking wedge are provided at the connection between the rod body main section and the rod body strain section, and a magnetic switch is built into the switch compartment; a sealing wedge is provided at the connection between the rod body main section and the rod body strain section. The first blocking wedge is used to block the front end of the switch compartment; the main section of the rod body is provided with a receiving compartment and a second blocking wedge, the receiving compartment is equipped with an electronic circuit device for receiving data collected by the strain gauge and sending it to the signal processing device, the front end of the receiving compartment is connected to the rear end of the switch compartment, and the front end of the receiving compartment is provided with a wiring hole 1 for wiring; the second blocking wedge blocks the rear end of the receiving compartment, and a wireless charging receiving coil is provided inside the second blocking wedge, which is connected to the electronic circuit device and is used to charge the built-in power supply of the electronic circuit device during wireless charging; The charging base is provided with a wireless charging transmitting coil. During wireless charging, the drill pipe of the measurement while drilling is installed on the charging base, and the wireless charging receiving coil is wirelessly powered by the wireless charging transmitting coil to charge the built-in power supply of the electronic circuit device. The signal processing device communicates wirelessly with the electronic circuit device, is used to receive data fed back by the electronic circuit device, and obtain the real-time torque and feed force of the drill rod during the drilling process after processing the data.

2. The equipment for measuring torque and feed force while drilling according to claim 1, characterized in that: Screw holes are provided on the circumferential surface of the rod strain section on both sides of the annular groove for installing fixing bolts to fix the protective sleeve on the rod strain section; and waterproof glue is filled between the protective sleeve and the annular groove.

3. The equipment for measuring torque and feed force while drilling according to claim 1, characterized in that: The outer diameter of the protective sleeve is the same as the outer diameter of the rod body.

4. The equipment for measuring torque and feed force while drilling according to claim 1, characterized in that: The electronic circuit device includes a power supply, a voltage regulator, a signal receiving module, an operational amplifier module, a control module, a storage module, a magnetic switch and a communication module. The signal receiving module is connected to the strain gauge and is used to receive the real-time voltage signal transmitted by the strain gauge. The operational amplifier module is respectively connected to the signal receiving module and the control module and is used to amplify the voltage signal transmitted by the signal receiving module and transmit it to the control module; the control module is respectively connected to the storage module and the communication module and is used to send the data to the signal processing device through the communication module and store the data in the storage module; the power supply supplies power to the signal receiving module, the operational amplifier module, the control module, the storage module and the communication module through the voltage regulator; the magnetic switch is connected to the control module and is used to control the opening and closing of the electronic circuit device.

5. The equipment for measuring torque and feed force while drilling according to claim 1, characterized in that: A flow channel 1 is axially opened inside the rod strain section, and an annular flow channel 2 is axially opened inside the rod strain section surrounding the accommodating chamber. The flow channel 2 is connected to the flow channel 1, and is used to supply water through the flow channel 1 and the flow channel 2 when the drill bit is drilling, so as to perform wet operation.

6. The equipment for measuring torque and feed force while drilling according to claim 1, characterized in that: The ends of the rod body strain section and the ends of the rod body main section are both provided with connecting sections, which are convenient for connection with the drill bit and other drill rods.

7. A working method for the torque and feed force measurement while drilling equipment according to any one of claims 1 to 6, characterized in that: The specific steps are: A. First, connect the two ends of the MWD drill pipe coaxially to the drill bit and ordinary drill pipe respectively through the connecting section, and control the magnetic switch to the on state through the switch hole. At this time, the entire electronic circuit device is in the working state, and the wireless communication status between the signal processing equipment and the electronic circuit device is tested. The assembly and preparation of the MWD drill pipe are completed; B. When construction begins, the drill pipe is drilled into the coal and rock mass along with the drill bit. Simultaneously, the strain gauges acquire electrical signals representing the axial and radial strains of the pipe segment in real time and feed them back to the electronic circuit device. The electronic circuit device wirelessly transmits this data to the signal processing device, which can then obtain the torque and feed force experienced by the drill pipe in real time during the drilling process. C. After completing a drilling measurement, the measurement-while-drilling drill pipe and the drill bit are removed from the borehole, and a switch device is inserted from the flow channel at the front end of the drill pipe to the position of the blocking wedge. The magnetic switch is triggered by magnetic force to turn off the electronic circuit device. The measurement-while-drilling drill pipe is then placed on a charging base, which is connected to an external power source for wireless charging. At this time, the wireless charging receiving coil is wirelessly powered by the wireless charging transmitting coil to charge the built-in power supply of the electronic circuit device. After completion, the measurement-while-drilling drill pipe is used for the next drilling measurement.

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