A rotary heat balance system and control method for a mine electric drive drilling machine

Abstract

The application discloses a kind of mine electric drive drilling machine rotator heat balance system and control method, setting rotary motor, reduction gearbox, hydraulic oil circulation unit and cooling water circulation unit;Rotary motor is connected with reduction gearbox transmission, and reduction gearbox is connected with rotator main shaft transmission;Hydraulic oil circulation unit is cooled for reduction gearbox by setting multiple oil nozzles in reduction gearbox box;Cooling water circulation unit is cooled for rotary motor.The application realizes the time-sharing multiplexing heat balance control of the rotary system of electric drive drilling machine by setting double-cycle cooling system, and can be cooled for rotary motor, rotator and reduction gearbox by sharing hydraulic oil circulation unit and cooling water circulation unit with feed motor and track walking motor, to solve the problem of excessively high temperature when rotary motor drives rotator to work.

Description

Technical Field

[0001] This invention belongs to the field of coal mine drilling equipment technology, and relates to a thermal balance system and control method for a rotary head of a mining electric drive drilling rig. Background Technology

[0002] The rotary system is a crucial component of underground coal mine drilling rigs, indispensable in water exploration and drilling processes. Installed on the rig's feed device and working in conjunction with it for drilling operations, the rotary system's primary function is to clamp the drill string and provide torque and axial force. Currently, conventional rotary systems are typically hydraulically driven, with hydraulic fluid serving as the power source; the hydraulic oil drives a motor to rotate and clamp the drill string. However, with the development of electric drilling rigs, conventional hydraulic rotary systems can no longer meet the requirements of electric drilling rigs regarding clamping force, rotation speed, and accuracy during drill string drilling. Furthermore, electric drilling rigs have replaced conventional hydraulic motors with electric motors, whose speeds far exceed those of rotary systems driven by conventional hydraulic motors.

[0003] However, drilling operations typically face challenges such as heavy loads, high power demands, and variable operating conditions, requiring electric drilling rig drive systems (i.e., rotary systems) to possess significant power output and a wide speed range. These operating conditions make it difficult for rotary motors to continuously operate within their high-efficiency range, especially under heavy loads or strong disturbances, easily leading to motor stalling. When the motor is inefficient or stalled, a large amount of electrical energy is converted into heat, causing increased internal resistance and winding temperature rise, thus creating a vicious cycle of "decreased efficiency → increased heat loss → further reduction in efficiency." Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a thermal balance system and control method for the rotary head of a mining electric-driven drilling rig, in order to solve the problem of excessively high temperature when the rotary head is driven by a motor, and to achieve thermal balance control and even adaptive drilling of the rotary head system of the mining electric-driven drilling rig.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] A thermal balance system for a rotary head of a mining electric-drive drilling rig includes a rotary motor, a gearbox, a hydraulic oil circulation unit, and a cooling water circulation unit. The rotary motor is connected to the gearbox via a drive, and the gearbox is connected to the rotary head spindle via a drive. The hydraulic oil circulation unit controls the temperature of the gearbox by embedding multiple oil nozzles on the inner wall of the gearbox. The cooling water circulation unit surrounds the rotary motor to control its temperature.

[0007] Optionally, the hydraulic oil circulation unit includes a hydraulic oil pump, a hydraulic oil cooler, and an oil injector, with one end of the hydraulic oil cooler connected to the hydraulic oil pump and the other end connected to the oil injector. Multiple fuel injectors are provided and embedded in the housing wall of the gearbox.

[0008] Optionally, the gearbox includes at least a first gear meshing area and a second gear meshing area; the number of fuel injectors is four or more, with at least two first fuel injectors and second fuel injectors used to cool the first gear meshing area, and at least two third fuel injectors and fourth fuel injectors used to cool the second gear meshing area.

[0009] Optionally, the relationship between each fuel injector and the attitude angle should be: ; in The standard unit of measurement for fuel injection quantity. For the host's attitude angle, The flow rate of the first fuel injector a The flow rate of the second fuel injector b. The flow rate of the third fuel injector c. The flow rate of the fourth fuel injector d.

[0010] Optionally, the cooling water circulation unit includes a cooling water tank, a cooling water pump, a motor cooling housing, and a frequency converter. The two ends of the cooling water pump are respectively connected to the cooling water tank and the motor cooling housing. The water-cooled housing is located outside the rotary motor. The frequency converter adjusts the speed of the rotary motor. The water-cooled housing is located outside the frequency converter and is connected in series with the motor cooling housing outside the rotary motor.

[0011] Optionally, a control unit is also provided; the control unit includes a first temperature sensor for monitoring the temperature of the gearbox; and a second temperature sensor for monitoring the temperature of the rotary motor.

[0012] Optionally, the control unit may further include a main controller and a data processing module; The hydraulic oil circulation unit also includes at least one electromagnetic flow valve, which is used to control the oil output of the injector; the data processing module outputs an adjustment command for the oil pressure of the hydraulic oil circulation unit based on the temperature of the first temperature sensor; the main controller controls the opening and closing degree of the electromagnetic flow valve based on the adjustment command. The cooling water circulation unit also includes at least one variable frequency speed control valve, which is used to control the flow rate of the cooling water pump. The data processing module outputs the cooling water adjustment command of the cooling water circulation unit based on the temperature of the second temperature sensor; the main controller controls the flow rate of the variable frequency speed control valve based on the adjustment command.

[0013] The control method for the thermal balance system of the rotary head of the mining electric-drive drilling rig described in this invention achieves thermal balance control of the mining electric-drive drilling rig by setting up a dual-circulation cooling system. The method includes the following steps: a. The rotary motor receives and executes the torque output command from the main controller to drive the gearbox to rotate; b. The second temperature sensor detects the current temperature of the rotary motor. The first temperature sensor detects the current temperature of the gearbox. The temperature signal value is then sent to the main controller. c. The main controller bases the temperature signal value. , With the set temperature signal value Calculate the comparison temperature signal value ; ; ; c1. The main controller compares whether the temperature signal value T is equal to the set temperature signal value. If the temperature signal value T is greater than or equal to the set temperature signal value, then step c2 is executed; otherwise, the main controller outputs a comparison temperature signal value of 1, and continues to execute step d; c2, the main controller outputs a comparison temperature signal value Continue with step d; d. The main controller compares the temperature signal value. Calculate the required coolant flow rate for the cooling systems of the rotary motor and gearbox respectively. With hydraulic oil flow rate And adjust the coolant flow rate of the heat dissipation system; The result is a negative decrease in flow rate, a result of 0 indicates no change in flow rate, and a result of a positive increase in flow rate; in the rotary motor cooling cycle, the motor power is... Efficiency is So, the heating power of the rotary motor for: ; To keep the temperature rise of the rotary motor at 0, the heat power removed by the coolant must be equal to the heat power of the motor: → ; For the temperature rise of the rotary motor; This refers to the density of the coolant. This refers to the specific heat capacity of the coolant. The required flow rate for the rotary motor cooling system; In the gearbox cooling cycle, let the gearbox power efficiency be... The input power of the gearbox is: ; The power of the gearbox heating is: ; Similarly, the required flow rate of the gearbox cooling system for: ; d1. The main controller compares the current hydraulic oil flow rate Q1 and the current coolant flow rate Q2 to see if they are equal to the required flow rate. If the current flow rates Q1 and Q2 are less than the required flow rate, then step d2 is executed; otherwise, the current flow rates are kept unchanged. d2. The main controller controls the opening and closing degree of the electromagnetic flow valve, and the flow meters detect and adjust the flow rates of hydraulic oil and coolant to the required flow rates, ultimately achieving... =0; ; ; ; Where Q is the flow rate, A is the cross-sectional area of ​​the solenoid valve opening, and V is the flow velocity of the coolant or hydraulic oil. d21. As the temperature continues to rise, the main controller determines whether the current flow rate Q has reached the maximum flow rate. If the current flow rate has not reached the maximum flow rate, proceed to step d22; otherwise, proceed to step d23. d22. The main controller adjusts the current flow rates Q1 and Q2 of the hydraulic oil and coolant to the required flow rates. , until satisfied Temperature rise requirement, If the value is 0, proceed to the next step e1; d23. The main controller reduces the output power of the rotary motor until it meets the requirements. Temperature rise requirement, If the value is 0, proceed to the next step e1; e. When the temperature of the rotary motor and gearbox meets the requirements At this time, the rotary motor speeds up, and the rotary speed of the rotary device increases.

[0014] Compared with existing technologies, it has the following technical advantages: In this invention, the output end of the rotary motor is connected to the input end of the gearbox, and the output end of the gearbox is connected to the rotary actuator. The rotary motor drives the gearbox, which in turn drives the rotary actuator. During operation of the electric drilling rig, the gearbox generates heat, which is cooled by the hydraulic oil circulation unit. Similarly, the rotary motor generates heat during operation, which is cooled by the cooling water circulation unit. This invention achieves time-sharing multiplexing thermal balance control of the rotary system of the electric drilling rig by setting up a dual-circulation cooling system. By sharing the hydraulic oil circulation unit and cooling water circulation unit with the feed motor and track motor, the rotary motor, rotary actuator, and gearbox can be cooled, thus solving the problem of excessively high temperatures when the rotary motor drives the rotary actuator. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the rotary system of a mining electric-driven drilling rig in an embodiment of this application; Figure 2 This is a schematic diagram of the internal cross-section of the rotary system in the embodiments of this application; Figure 3 This is a block diagram of the hydraulic oil circulation unit in the embodiments of this application; Figure 4 This is a block diagram of the cooling water circulation unit in the embodiments of this application; Figure 5 This is a block diagram of the control unit in an embodiment of this application; Figure 6 Schematic diagram of time-sharing multiplexing thermal balance adaptive drilling for electric rotary units The attached figures are labeled as follows: 1-Rotary motor, 2-Reduction gearbox, 3-Water supply, 4-Drive rod, 5-Support plate, 6-Slide rail; 11-Water inlet, 12-Water outlet, 13-Motor cooling housing, 14-Second temperature sensor; 21-Oil inlet, 22-Oil return port, 23-First gear meshing area, 24-First temperature sensor, 25-Second gear meshing area; a-First fuel injector, b-Second fuel injector, c-Third fuel injector, d-Fourth fuel injector. Detailed Implementation

[0017] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “parentheses” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following description is only for explaining the present invention and does not limit its content.

[0020] The units for the specific physical parameters in this invention are: temperature T "℃", density "kg / m³", and specific heat capacity "J / (kg)". ℃), Flow rate (L / min), Power (W), Flow velocity (m / s), Area (m²) 2 All other unmentioned parameters are in SI units.

[0021] Combination Figure 1-5 The thermal balance system for the rotary head of the mining electric drilling rig of the present invention includes a "dual circulation" system comprising a rotary motor 1, a gearbox 2, a hydraulic oil circulation unit, and a cooling water circulation unit. It utilizes a time-sharing multiplexing thermal balance control method applied to the entire thermal balance system of the electric drilling rig. The rotary motor 1 is driven by the gearbox 2, which is in turn driven by the rotary head spindle. The hydraulic oil circulation unit cools the gearbox, and the cooling water circulation unit cools the rotary motor. Simultaneously, multiple oil spray ports are installed at various angles within the gearbox housing to ensure that the gearbox gears can fully contact the hydraulic oil during multi-position drilling, rapidly dissipating heat. The gearbox 2 is connected to a water jet 3 and a drive rod 4. The entire system is mounted on a sliding support plate 5, which is mounted on a slide rail 6, allowing for position adjustment of the entire system.

[0022] Furthermore, the rotary system of the mining electric-driven drilling rig according to the embodiments of this application may also have the following technical features: In this invention, the hydraulic oil circulation unit includes a hydraulic oil tank, a hydraulic oil pump, a brazed plate cooler, an oil inlet pipe, an oil injector, and an oil return pipe. The gearbox 2 is provided with an oil inlet 21 and an oil return port 22 to supply oil to the oil injector located on the inner side of the gearbox wall. The hydraulic oil cooler is connected to the oil inlet 21. One end of the hydraulic oil cooler is connected to the hydraulic oil pump, and the other end is connected to the oil injector. The oil injector is located in various parts of the internal cavity of the gearbox.

[0023] In this invention, the gearbox 2 includes at least a first gear meshing area 23 and a second gear meshing area 24. The number of fuel injectors is four or more, with at least two injectors used to cool the first gear meshing area 23 and at least two injectors used to cool the second gear meshing area 24. For example, with four or more fuel injectors, at least two first fuel injectors (a) and two second fuel injectors (b) are used to cool the first gear meshing area 23, and at least two third fuel injectors (c) and four fourth fuel injectors (d) are used to cool the second gear meshing area 25. The relationship between each fuel injector and the attitude angle should be: ; in The standard unit of measurement for fuel injection quantity. For the host's attitude angle, The flow rate of the first fuel injector a The flow rate of the second fuel injector b. The flow rate of the third fuel injector c. The flow rate of the fourth fuel injector d.

[0024] In this invention, the cooling water circulation unit includes a cooling water tank, a cooling water pump, a motor cooling housing (13), a frequency converter, an inlet pipe, and a return pipe. The two ends of the cooling water pump are connected to the cooling water tank and the motor cooling housing, respectively. The motor cooling housing 13 is located outside the rotary motor 1. The unit also includes a frequency converter, which is configured to adjust the speed of the rotary motor 1. The frequency converter also has a water-cooled housing, which is connected in series with the motor cooling housing (13) outside the rotary motor for synchronous temperature control.

[0025] In this invention, the rotary system of the drilling rig further includes a control unit, which includes a first temperature sensor 24 for monitoring the temperature of the gearbox 2. The control unit also includes a second temperature sensor 14 for monitoring the temperature of the rotary motor 1.

[0026] In this invention, the control unit further includes a main controller and a data processing module; the hydraulic oil circulation unit further includes at least one electromagnetic flow valve, which is used to control the oil output of the fuel injector; the data processing module outputs an adjustment command for the oil pressure of the hydraulic oil circulation unit based on the temperature of the first temperature sensor; the main controller controls the opening and closing degree of the electromagnetic flow valve according to the adjustment command; the cooling water circulation unit further includes at least one variable frequency speed control valve, which is used to control the flow rate of the cooling water pump; the data processing module outputs an adjustment command for the cooling water of the cooling water circulation unit based on the temperature of the second temperature sensor; the main controller controls the flow rate of the variable frequency speed control valve according to the adjustment command.

[0027] In this invention, when the rotary motor drives the rotary unit and the temperature is too high, a cooling water circulation unit is set up to cool the rotary motor, and a hydraulic oil circulation unit is set up to cool the gearbox of the rotary system of the mining electric drill. The temperature of the rotary motor and gearbox is monitored in real time by a first and a second temperature sensor of the control system. The heat dissipation of the hydraulic oil circulation unit and the cooling water circulation unit is adjusted in real time based on the monitored temperature. This dual-circulation cooling system achieves thermal balance control of the mining electric drill. The thermal balance of the rotary system must first meet the time-sharing multiplexing thermal balance control logic of the entire machine, and must satisfy the following basic logic: ; in This is the maximum flow rate of the electric drilling rig. To provide flow rate to the motor, For the flow rate of the rotary motor, This refers to the flow rate of the walking motor.

[0028] Example 1: like Figure 1-5 As shown in the embodiment, a rotary system for a mining electric-driven drilling rig is proposed, including a rotary motor 1, a gearbox 2, a hydraulic oil circulation unit, and a cooling water circulation unit. The rotary motor is connected to the gearbox 2 for transmission; the hydraulic oil circulation unit is used to cool the gearbox 2; and the cooling water circulation unit is used to cool the rotary motor 1.

[0029] In this embodiment, the output end of the rotary motor 1 is connected to the input end of the gearbox 2, and the rotary motor 1 drives the gearbox 2, which in turn drives the rotary drill to perform rotary drilling operations. When the electric-driven drilling rig is working, the gearbox 2 generates heat, which is cooled by the hydraulic oil circulation unit. The rotary motor 1 also generates heat during operation, which is cooled by the cooling water circulation unit. This embodiment, through the "dual circulation" of the hydraulic oil circulation unit and the cooling water circulation unit, can cool the entire rotary system 1, thereby solving the problem of excessively high temperatures during adaptive drilling operations. The thermal balance control of the rotary system 1 of the mining electric-driven drilling rig is achieved by setting up a dual-circulation cooling system.

[0030] In this embodiment, the hydraulic oil circulation unit includes a hydraulic oil pump, a hydraulic oil cooler, and an oil injector. The top of the gearbox 2 has an oil inlet 21, and the hydraulic oil cooler is connected to the oil inlet 21. One end of the cooler is connected to the hydraulic oil pump, and the other end is connected to the oil injector, which is located inside the gearbox 2. In this embodiment, the gearbox 2 contains hydraulic oil. During operation, the hydraulic oil flows out from the return port 22 at the bottom of the gearbox 2. Pressurized by the hydraulic oil pump, the hydraulic oil flows from the tank through the cooler, where it exchanges heat with external cooling water to cool down. It then returns to the gearbox 2 through the oil inlet 21. The oil injector located inside the cavity sprays water onto each stage of the reduction gears to cool the gearbox 2.

[0031] In this embodiment, the hydraulic oil circulation unit is equipped with an oil tank for storing hydraulic oil. Furthermore, a filter is installed at the oil tank's suction port to filter out metal shavings from gear wear.

[0032] In this embodiment, the gearbox 2 includes at least a first gear meshing area 23 and a second gear meshing area 25. The number of fuel injectors is four or more. At least two first fuel injectors (a) and two second fuel injectors (b) are used to cool the first gear meshing area 23, and at least two third fuel injectors (c) and four fourth fuel injectors (d) are used to cool the second gear meshing area 25. In this embodiment, the gearbox 2 can be a two-stage gearbox, which includes a first gear meshing area and a second gear meshing area. It can also be a high-speed gear meshing area and a low-speed gear meshing area. The number of fuel injectors can be set to multiple evenly distributed inside the gearbox cavity. By setting multiple fuel injectors, heat dissipation of the gearbox 2 can be achieved under different postures when drilling upward and downward holes in the main body of the drilling rig. Furthermore, the distance between the fuel injectors and the reduction gears must be greater than or equal to 10 mm to avoid collisions during high-speed rotation.

[0033] The gearbox oil level is typically controlled at 1 / 2 to 2 / 3 of the gearbox volume. With the main unit's horizontal angle at 0°, as the main unit's pitch angle is adjusted, at least two fuel injectors will be above the oil level. The pitch angle is collected by a rotary encoder at the angle adjustment device. Therefore, the relationship between each fuel injector and the pitch angle should be: ; in The standard unit of measurement for fuel injection quantity. For the host's attitude angle, The flow rate of the first fuel injector a The flow rate of the second fuel injector b. The flow rate of the third fuel injector c. The flow rate of the fourth fuel injector d.

[0034] In this embodiment, the cooling water circulation unit includes a water tank, a water pump, and a water-cooled housing. The two ends of the water pump are connected to the water tank and the water-cooled housing 13, respectively. The water-cooled housing 13 is disposed within both the rotary motor 1 and the frequency converter. In this embodiment, cooling water is pressurized by the water pump and delivered to the water-cooled housing 13 to cool the rotary motor 1. An explosion-proof layer is provided around the rotary motor 1. The water-cooled housing 13 is disposed between the rotor of the rotary motor and the explosion-proof layer, arranged in a U-shape to ensure unidirectional flow of the cooling water and prevent localized heat accumulation.

[0035] In this embodiment, the rotary system of the electric drilling rig also includes a frequency converter, which is configured to regulate the speed of the rotary motor 1 and distribute the required voltage. A portion of the water-cooled housing 13 is located within the frequency converter. During operation, the frequency converter also generates heat; therefore, the water-cooled housing 13 is located inside the explosion-proof housing of the frequency converter to cool it. The frequency converter heats up more slowly than the rotary motor 1; therefore, the cooling water must flow through the frequency converter first and then through the rotary motor to form a unidirectional flow and avoid localized heat accumulation.

[0036] In this embodiment, the rotary system of the electric drilling rig also includes a control unit. The control unit includes a first temperature sensor 24 disposed on the outer wall of the gearbox 2 for real-time monitoring of the gearbox 2's temperature. The control unit also includes a second temperature sensor 14 for monitoring the temperature of the rotary motor. Multiple second temperature sensors 14 can be used; some monitor the output end of the rotary motor 1, monitoring the high-load heating area in real-time; others are disposed around the stator windings of the rotary motor, monitoring the core heating areas of copper and iron losses in real-time. By setting multiple second temperature sensors 14, the temperature of the rotary motor 1 under different loads, speeds, and torques can be monitored in real-time. The control unit also includes solenoid valves and flow meter sensors respectively arranged at the oil and water inlet pipes of the gearbox 2 and the rotary motor 1. The flow meter is used to detect the hydraulic oil and cooling water flow rates in real-time, and the feedback is sent to the controller, which then controls the flow rate changes through the solenoid valves to rationally distribute the dual-circulation flow. This provides data support for the adaptive working drilling state thermal balance control of the rotary system 10 of the mining electric drilling rig. The control unit also includes a main controller and a data processing module. The hydraulic oil circulation unit is equipped with an electromagnetic flow valve, which controls the oil output of the fuel injector. The data processing module is configured to output an adjustment command for the hydraulic oil flow rate of the hydraulic oil circulation unit based on the temperature of the first temperature sensor 24. The main controller is configured to control the opening and closing degree of the electromagnetic flow valve according to the adjustment command. In this embodiment, the main controller can be a programmable logic controller (PLC), which must be an explosion-proof type for mining applications with a response time of less than or equal to 0.5 seconds. When the temperature of the first temperature sensor 24 rises, the data processing module receives the temperature rise signal and, combined with the real-time monitored flow rate, increases the flow rate adjustment command according to the operating conditions. The main controller increases the opening and closing degree of the corresponding electromagnetic flow valve according to the adjustment command to increase the oil output of the fuel injector and increase the hydraulic oil circulation speed in the gearbox 2 to cool down and prevent overheating. Similarly, the data processing module is also configured to output an adjustment command for the cooling water flow rate of the cooling water circulation unit based on the temperature of the second temperature sensor 14. In this embodiment, a variable frequency speed control valve is connected in series at the outlet of the water pump. This valve can adjust the cooling water flow rate of the cooling water circulation unit based on the real-time temperature dynamics of the rotary motor and the cooling water flow rate monitored by the flow meter. When the temperature monitored in real time by the second temperature sensor 14 rises, the data processing module receives the signal and outputs an adjustment command to increase the cooling water flow rate. The variable frequency speed control valve increases its opening degree to increase the water flow rate in the water-cooled housing 13, thereby quickly cooling the rotary motor.

[0037] Thermal balance control of mining electric-drive drilling rigs is achieved by setting up a dual-circulation cooling system.

[0038] The method includes the following steps: a. The rotary motor receives and executes the torque output command from the whole machine controller to drive the gearbox to rotate; b. The second temperature sensor detects the current temperature of the rotary motor. The first temperature sensor detects the current temperature of the gearbox. and sends the temperature signal value to the controller; c. The controller bases the temperature signal value. , With the set temperature signal value Calculate the comparison temperature signal value ; ; ; c1. The controller compares whether the temperature signal value T is equal to the set temperature signal value. If the temperature signal value T is greater than or equal to the set temperature signal value, then step c2 is executed; otherwise, the heat dissipation controller outputs a comparison temperature signal value of 1 and continues to execute step d. c2, Controller outputs comparison temperature signal value Continue with step d.

[0039] d. The heat dissipation system controller compares the temperature signal value. Calculate the required coolant flow rate for the cooling systems of the rotary motor and gearbox respectively. With hydraulic oil flow rate And adjust the coolant flow rate of the heat dissipation system. The result is a negative decrease in flow, a result of 0 indicates no change in flow, and a result of positive indicates an increase in flow.

[0040] In the rotary motor cooling cycle, the motor power is... Efficiency is So, the heating power of the rotary motor for: ; To keep the temperature rise of the rotary motor at 0, the heat power removed by the coolant must be equal to the heat power of the motor: → ; For the temperature rise of the rotary motor; This refers to the density of the coolant. This refers to the specific heat capacity of the coolant. This is the flow rate required for the rotary motor cooling system.

[0041] In the gearbox cooling cycle, let the gearbox power efficiency be... The input power of the gearbox is: ; The power of the gearbox heating is: ; Similarly, the required flow rate of the gearbox cooling system for: ; d1. The controller compares the current hydraulic oil flow rate Q1 and the current coolant flow rate Q2 to see if they are equal to the required flow rate. If the current flow rates Q1 and Q2 are less than the required flow rate, then step d2 is executed; otherwise, the current flow rates are kept unchanged. d2. The cooling system controller controls the opening and closing degree of the solenoid valve, and the flow meters detect and adjust the flow rates of hydraulic oil and coolant to the required flow rates, ultimately ensuring... It is 0.

[0042] ; ; ; Where Q is the flow rate, A is the cross-sectional area of ​​the solenoid valve opening, and V is the flow velocity of the coolant and hydraulic oil.

[0043] d21. As the temperature continues to rise, the heat dissipation controller determines whether the current flow rate Q has reached the maximum flow rate. If the current flow rate has not reached the maximum flow rate, proceed to step d22; otherwise, proceed to step d23. d22. The controller adjusts the current flow rates Q1 and Q2 of the hydraulic oil and coolant to the required flow rates. , until satisfied Temperature rise requirement, If the value is 0, proceed to the next step e1; d23. The heat dissipation controller sends a feedback signal to the motor controller. Upon receiving the feedback signal, the motor controller reduces the output power of the rotary motor until the required power is met. Temperature rise requirement, If the value is 0, proceed to the next step e1.

[0044] e. When the temperature of the rotary motor and gearbox meets the requirements At this time, the rotary motor speeds up, and the rotary speed of the rotary device increases.

[0045] Combination Figure 6 The following are the process descriptions for two operating conditions: I. Working Process in Soft Coal Seams and Low-Load Rock Strata When the slewing load is low, T1≤T 设1 At this time T差1 If the value is ≤0, it indicates that the hydraulic oil flow rate is unchanged or decreasing. In this case, the hydraulic oil flow rate Q1 is compared with the reference flow rate Qoil: if Q1≤Qoil, the opening of the hydraulic oil solenoid valve remains unchanged; if Q1>Qoil, the opening of the hydraulic oil solenoid valve is closed. T2≤T 设2 At this time T 差2 If the value is ≤0, it indicates that the coolant flow rate is unchanged or decreased. In this case, the coolant flow rate Q2 is compared with the reference flow rate Q_cold: if Q2≤Q_cold, the coolant solenoid valve opening remains unchanged; if Q2>Q_cold, the coolant solenoid valve opening is closed. The rotational motor speed is increased, which in turn drives the power and speed of the rotary engine to increase simultaneously, thus completing the adaptive drilling action under this working condition.

[0046] II. Working Process in Hard Rock Formations The drilling operation is started, and the process proceeds sequentially through the operation of the rotary motor and the rotation of the gearbox. After confirming that the rotary load is normal, the process enters the rapid rotary drilling and thermal balance adaptive drilling stages.

[0047] Perform two sets of temperature judgments: The slewing load is high, T1 > T 设1 If Tdifference > 0, it is determined that the hydraulic oil flow rate has increased. Compare the hydraulic oil flow rate Q1 with Qoil: if Q1 ≤ Qoil, the opening of the hydraulic oil solenoid valve increases; if Q1 > Qoil, the opening of the hydraulic oil solenoid valve remains unchanged.

[0048] T2>T 设2 If Tdifference > 0, it is determined that the coolant flow rate has increased. Compare the coolant flow rates Q2 and Qcold: if Q2 ≤ Qcold, the opening of the coolant solenoid valve increases; if Q2 > Qcold, the opening of the coolant solenoid valve remains unchanged.

[0049] Execute the branch based on the traffic limit exceeding situation: If Q_cold > Q_MAX_cold or Q_oil > Q_MAX_oil: First reduce the power and speed of the rotary motor, then determine if T_difference ≤ 0, trigger the rotary motor speed to increase.

[0050] If Q2 = Qcold ≤ QMAXcold, or Q2 = Qoil ≤ QMAXoil: first determine T difference ≤ 0, trigger the rotary motor speed increase, and finally achieve synchronous increase of rotary power and speed.

[0051] The hydraulic oil pump and cooling water pump in the "dual circulation" cooling system have hardware maximum power limits. When the temperature rise rate cannot be limited by the cooling system, the control system reduces the power of the rotary motor to ensure that the drilling rig hardware is not damaged, enabling the electric drive drilling rig to achieve adaptive drilling.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A thermal balance system for the rotary head of a mining electric-drive drilling rig, characterized in that, The system includes a rotary motor (1), a gearbox (2), a hydraulic oil circulation unit, and a cooling water circulation unit. The rotary motor (1) is connected to the gearbox (2) for transmission, and the gearbox (2) is connected to the main shaft of the rotary engine for transmission. The hydraulic oil circulation unit controls the temperature of the gearbox (2) by embedding multiple oil nozzles in the inner wall of the gearbox (2); The cooling water circulation unit is set up outside the rotary motor (1) to control the temperature of the rotary motor (1).

2. The thermal balance system for the rotary head of a mining electric-drive drilling rig according to claim 1, characterized in that, The hydraulic oil circulation unit includes a hydraulic oil pump, a hydraulic oil cooler, and an oil injector. One end of the hydraulic oil cooler is connected to the hydraulic oil pump, and the other end is connected to the oil injector. Multiple fuel injectors are provided and embedded in the housing wall of the gearbox (2).

3. The thermal balance system for the rotary head of a mining electric-drive drilling rig according to claim 1 or 2, characterized in that, The gearbox (2) includes at least a first gear meshing area (23) and a second gear meshing area (25); The number of the fuel injectors is four or more, with at least two first fuel injectors (a) and second fuel injectors (b) used to cool the first gear meshing area (23), and at least two third fuel injectors (c) and fourth fuel injectors (d) used to cool the second gear meshing area (25).

4. The thermal balance system for the rotary head of a mining electric-drive drilling rig according to claim 3, characterized in that, The relationship between each fuel injector and its attitude angle should be as follows: ； in The standard unit of measurement for fuel injection quantity. For the host's attitude angle, The flow rate of the first fuel injector a The flow rate of the second fuel injector b. The flow rate of the third fuel injector c. The flow rate of the fourth fuel injector d.

5. The thermal balance system for the rotary head of a mining electric-drive drilling rig according to claim 1 or 2, characterized in that, The cooling water circulation unit includes a cooling water tank, a cooling water pump, a motor cooling housing (13) and a frequency converter. The two ends of the cooling water pump are connected to the cooling water tank and the motor cooling housing (13) respectively. The motor cooling housing (13) is located outside the rotary motor (1). The frequency converter adjusts the speed of the rotary motor (1). A water-cooled housing is installed outside the frequency converter, which is connected in series with the motor cooling housing (13) outside the rotary motor.

6. The thermal balance system for the rotary head of a mining electric-drive drilling rig according to claim 1 or 2, characterized in that, A control unit is also included; The control unit includes a first temperature sensor (24) for monitoring the temperature of the gearbox (2); Includes a second temperature sensor (14), which is used to monitor the temperature of the rotary motor (1).

7. The thermal balance system for the rotary head of a mining electric-drive drilling rig according to claim 6, characterized in that, The control unit also includes a main controller and a data processing module; The hydraulic oil circulation unit also includes at least one electromagnetic flow valve, which is used to control the oil output of the injector; the data processing module outputs an adjustment command for the oil pressure of the hydraulic oil circulation unit based on the temperature of the first temperature sensor; the main controller controls the opening and closing degree of the electromagnetic flow valve based on the adjustment command. The cooling water circulation unit also includes at least one variable frequency speed control valve, which is used to control the flow rate of the cooling water pump. The data processing module outputs the cooling water adjustment command of the cooling water circulation unit based on the temperature of the second temperature sensor; the main controller controls the flow rate of the variable frequency speed control valve based on the adjustment command.

8. The control method for the thermal balance system of the rotary head of a mining electric-drive drilling rig as described in claim 7, characterized in that, Thermal balance control of mining electric-driven drilling rigs is achieved by setting up a dual-circulation cooling system. This method includes the following steps: a. The rotary motor receives and executes the torque output command from the main controller to drive the gearbox to rotate; b. The second temperature sensor detects the current temperature of the rotary motor. The first temperature sensor detects the current temperature of the gearbox. The temperature signal value is then sent to the main controller. c. The main controller bases the temperature signal value. , With the set temperature signal value Calculate the comparison temperature signal value ; ； ； c1. The main controller compares whether the temperature signal value T is equal to the set temperature signal value. If the temperature signal value T is greater than or equal to the set temperature signal value, then step c2 is executed; otherwise, the main controller outputs a comparison temperature signal value of 1, and continues to execute step d; c2, the main controller outputs a comparison temperature signal value Continue with step d; d. The main controller compares the temperature signal value. Calculate the required coolant flow rate for the cooling systems of the rotary motor and gearbox respectively. With hydraulic oil flow rate And adjust the coolant flow rate of the heat dissipation system; The result is a negative decrease in flow rate, a result of 0 indicates no change in flow rate, and a result of a positive increase in flow rate; in the rotary motor cooling cycle, the motor power is... Efficiency is So, the heating power of the rotary motor for: ； To keep the temperature rise of the rotary motor at 0, the heat power removed by the coolant must be equal to the heat power of the motor: → ； For the temperature rise of the rotary motor; This refers to the density of the coolant. This refers to the specific heat capacity of the coolant. The required flow rate for the rotary motor cooling system; In the gearbox cooling cycle, let the gearbox power efficiency be... The input power of the gearbox is: ； The power of the gearbox's heat generation is: ； Similarly, the required flow rate of the gearbox cooling system for: ； d1. The main controller compares the current hydraulic oil flow rate Q1 and the current coolant flow rate Q2 to see if they are equal to the required flow rate. If the current flow rates Q1 and Q2 are less than the required flow rate, then step d2 is executed; otherwise, the current flow rates are kept unchanged. d2. The main controller controls the opening and closing degree of the electromagnetic flow valve, and the flow meters detect and adjust the flow rates of hydraulic oil and coolant to the required flow rates, ultimately achieving... =0; ； ； ； Where Q is the flow rate, A is the cross-sectional area of ​​the solenoid valve opening, and V is the flow velocity of the coolant or hydraulic oil. d21. As the temperature continues to rise, the main controller determines whether the current flow rate Q has reached the maximum flow rate. If the current flow rate has not reached the maximum flow rate, proceed to step d22; otherwise, proceed to step d23. d22. The main controller adjusts the current flow rates Q1 and Q2 of the hydraulic oil and coolant to the required flow rates. , until satisfied Temperature rise requirement, If the value is 0, proceed to the next step e1; d23. The main controller reduces the output power of the rotary motor until it meets the requirements. Temperature rise requirement, If the value is 0, proceed to the next step e1; e. When the temperature of the rotary motor and gearbox meets the requirements At this time, the rotary motor speeds up, and the rotary speed of the rotary device increases.

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