A thermal balance system and control method for a mine electric drive drilling machine feed device

Abstract

The application discloses a kind of mining electric drive drilling machine feed device heat balance system and control method, setting transmission system, transmission system includes: feed device, setting frame body, frame body one side is sliding surface, for installing support plate;Frame body is set screw rod conveying system along the axial direction, and is connected with support plate;Frame body is set shaft connection's feed motor and speed reducer, and speed reducer is moved screw rod transmission system by coupling;Frame body rear end installs rear support column, front end installs front support column.The application realizes the effect that final speed adjustable interval amplification, meets the need of low speed feed to ensure torque in the process of drilling and lifting rod, and the need of high speed feed to improve efficiency in the process of rod lifting.Solve the problem that water cooling system is mostly controlled by fixed flow, cannot adjust heat dissipation capacity according to real-time working condition of motor, there are "low-speed heat dissipation deficiency" and "high-speed energy consumption redundancy" dual problems.

Description

Technical Field

[0001] This application relates to the field of drilling technology and equipment, and in particular to a thermal balance system and control method for the feed device of a mining electric-drive drilling rig. Background Technology

[0002] The feed device of an electric drilling rig is the core execution unit for tunnel drilling operations. Existing electric feed systems typically use a fixed-ratio reducer to amplify motor torque. However, due to the limited adjustable range of the permanent magnet synchronous motor's output speed, heat generation increases dramatically as the speed deviates from the rated speed, and the system cannot operate for extended periods. In actual operation, low-speed feed is required to ensure torque during drilling and rod lifting, while high-speed feed is needed to improve efficiency during rod loading and unloading, with a difference of approximately 3-4 times. Because the motor's adjustable speed range is small and a fixed ratio is used, this cannot meet the requirements. Therefore, an adjustable-speed reducer is used to amplify the adjustable speed range, preventing the motor from operating in a low-efficiency, high-heat state for extended periods.

[0003] The permanent magnet synchronous motors used in electric drilling rigs have the advantages of high efficiency and high power density. However, when operating under high load and multiple working conditions for a long time, the heat generation dynamically changes with the speed and load, and the heat generation varies significantly with different speeds. In existing technologies, water cooling systems mostly use fixed flow control. Constant flow water cooling systems still maintain a high water supply and cannot adjust the heat dissipation capacity according to the real-time working conditions of the motor, resulting in the dual problems of "insufficient heat dissipation at low speeds" and "redundant energy consumption at high speeds". At the same time, with the increasing integration of the whole machine, various motion systems share cooling resources. Although independent cooling circuits are used, temperature control is generally performed for a single system, which can easily lead to local overheating problems under cross-operating conditions. Therefore, this invention proposes a feed device thermal balance system and control method that can dynamically adapt to working conditions, accurately estimate heat, and adjust the flow rate in real time. Summary of the Invention

[0004] This invention provides a thermal balance system and control method for the feed device of a mining electric-drive drilling rig, which solves the dual problems of "insufficient heat dissipation at low speeds" and "redundant energy consumption at high speeds" that water-cooling systems mostly use fixed flow control and cannot adjust the heat dissipation capacity according to the real-time operating conditions of the motor.

[0005] To solve the above problems, the technical solution adopted by the present invention includes:

[0006] A thermal balance system for the feed device of a mining electric-drive drilling rig includes a transmission system comprising: a feed device with a frame, one side of which is a sliding surface for mounting a support plate; a screw transmission system axially mounted inside the frame and connected to the support plate; a feed motor and a reducer mounted on the frame, the reducer driving the screw transmission system via a coupling; and a rear support column mounted at the rear end of the frame and a front support column mounted at the front end. A thermal management system and a control system are also provided; the thermal management system includes a cooling water pump, a cooling water circuit, a cooling water tank and a proportional solenoid valve, and collects data through a flow meter and a temperature sensor to monitor the temperature of the transmission system and thereby adjust the cooling water flow. The control system is used to analyze the thermal status data collected by the thermal management system in real time and execute the cooling resource allocation logic.

[0007] Optionally, the feed motor is a permanent magnet synchronous motor, and the reducer is an adjustable speed reducer, which drives the screw transmission system through a coupling; the screw transmission system is a ball screw or planetary screw structure, which is connected to the support plate through a flange, thereby driving the support plate to move back and forth.

[0008] Optionally, the adjustable speed reducer includes a reduction ratio of... The first gear working mode and reduction ratio are The second gear working mode requires switching between the two gears via a solenoid valve. The first gear is the low-speed mode, used for deep hole drilling and drill bit lifting operations; it operates at low speed. When in gear, the system output speed is ; The second gear mode is high speed, used for the rotary head to move backward and leave space during rod addition operations, and for the rotary head to move forward and retrieve the rod during rod removal operations; the system output speed is... , This is the rated speed of the motor, expressed in r / min. This indicates the rated speed coefficient.

[0009] Optionally, a rotary device is installed on the pallet; A mounting platform is installed on the front face of the frame, which is in contact with the sliding surface, for installing the clamps and release devices.

[0010] Optionally, under the operating conditions of the feed system, the control system controls the flow rate of the motor cooling water. He is the cooling flow rate of the speed reducer After obtaining the cooling water flow rate of the feed system, the cooling water flow rate of the thermal management system is dynamically adjusted and distributed, specifically including: First thermal load parameters of the feed system Including the thermal load of the feed motor and the thermal load of the reducer Its feed system temperature threshold includes the feed motor temperature threshold. and reducer temperature threshold ; Feed motor thermal load This includes the theoretical heat generation of the feed motor. and the actual heat generation of the feed motor based on temperature sensor data ; The theoretical heat generation of the feed motor is as follows for: ; In the formula: To provide the theoretical heat generated by the feed motor, W ; This represents the actual output power of the motor. W ; This represents the actual working efficiency of the feed motor at speed n; Based on the actual heat generation of the feed motor collected by the temperature sensor for: ; In the formula: Specific heat capacity of motor material, J / (kg) ℃); The total mass of the heating components of the motor is expressed in kg. The change in temperature read by the sensor is expressed in °C. The time interval corresponding to the temperature change is in seconds (s). The heat removed by the thermal management system is the thermal load of the feed motor. : ; The coolant flow rate of the instantaneous heating management system is: ; Theoretical heat generation of the motor Actual heat generation corresponding to sensor temperature The value selected from; The motor cooling water flow rate, in L / min, is the target parameter that is dynamically adjusted. Specific heat capacity of the cooling medium, J / (kg) ℃); The density of the cooling medium is expressed in kg / L. The allowable temperature rise of the cooling medium, in °C, is: + ≤ ; Dynamically adjust the coolant flow rate by acquiring parameters in real time, such as the current engine speed n and the temperature sensor temperature. Ambient temperature and time interval By calculating the theoretical heat generation of the motor Actual heat generation corresponding to sensor temperature Select the target heat that needs to be dissipated. ; like ; but: ; The error threshold can be set according to the actual working conditions; like ; but: ; Finally, the motor cooling water flow rate is dynamically calculated. This yields the optimal flow rate at the current rotational speed. The heat generated by the speed reducer comes from gear meshing and bearing heating, i.e., the total heat output. : ; Total heating power, W ; For the input power of the speed reducer, W ; For the speed reducer at the reduction ratio The efficiency of the lower; For bearing power loss, W ; ; The bearing friction torque is N. m; Angular velocity of the axis, in rad / s; According to the principle of thermal balance, the heat dissipation is: ; The coolant flow rate of the reducer is expressed in L / min. The density of the cooling medium is expressed in kg / L. Specific heat capacity of the cooling medium, J / (kg) ℃); The change in temperature is expressed in °C. + ≤ ; in For the target temperature, The initial ambient temperature; The cooling flow rate of the feed system is: .

[0011] Optionally, in driller mode, the feed system operating priority and driller mode operating priority can be set separately according to the dynamic allocation principle of thermal balance. The feed system operating priority, feed system cooling flow rate When the feed system cooling flow rate is at its maximum, the heat removed by the feed cooling system in real time is less than the heat dissipated by the transmission system. Therefore, priority should be given to ensuring the cooling flow rate of the feed motor. ,Right now: ; and This represents the actual cooling flow rate of the motor and reducer. To provide the maximum cooling flow rate to the system; The drilling mode operating condition priority is determined based on the actual operating conditions when the feed system and rotary system are working simultaneously, with the feed system in heavy load mode. At the same time, priority should be given to ensuring the supply system. When the rotary system is in high-speed cutting condition, priority should be given to ensuring the supply of the rotary system. Supply, i.e. , The flow rate required by the rotary system; if both are in priority mode, the system with the larger ratio is prioritized based on the ratio of real-time temperature detection data to its respective temperature threshold. ; , To provide the system with real-time temperature and temperature threshold, , Given the real-time temperature and temperature threshold of the rotary system, and: ; For the cooling flow rate of the hydraulic system circuit, This represents the maximum cooling flow rate of the entire system.

[0012] A control method for a thermal balance system of a mining electric-drive drilling rig feed device, utilizing any of the thermal balance systems described in this invention for control, specifically includes: The control system dynamically adjusts the cooling water flow rate via a proportional solenoid valve, thereby adjusting the thermal management system's response to the thermal load on the feed motor. and the thermal load of the reducer The distribution amount yields the cooling water flow rate of the feed system as follows: ; The coolant flow rate of the reducer is expressed in L / min. The value is the motor cooling flow rate, in L / min.

[0013] Optionally, based on the principle of dynamic allocation of thermal balance, the control system can set the priority of the feed system operating conditions and the priority of the driller's mode operating conditions respectively. The feed system operating conditions are prioritized, and the control system regulates the thermal management system to distribute heat to the feed system, so that the cooling water flow rate of the feed system is in the optimal state. In driller mode, the first thermal load parameter of the feed system and the second heat load parameters of the slewing system As two independent thermal control subsystems, the auxiliary hydraulic system Both the traveling and drilling modes participate in system operations, and all of the above systems are connected to the total cooling resources for dynamic allocation; when the feed system and the rotary system are working simultaneously, the cooling supply is determined according to the actual working conditions; if both are in priority working conditions, the determination is made based on the ratio of real-time temperature detection data to their respective temperature thresholds.

[0014] The technical effects achieved by this invention are as follows: (1) The wide-range adjustable speed feed device proposed in this invention controls the switching of the appropriate speed ratio of the reducer under different working conditions through the control of the solenoid valve, so as to achieve the effect of expanding the final speed adjustable range, and meet the working conditions that require low speed feed to ensure torque during drilling and rod lifting processes, while requiring high speed feed to improve efficiency during rod loading and unloading processes.

[0015] (2) This invention proposes a heat balance system and control method that can dynamically adapt to operating conditions, accurately estimate heat, and adjust flow rate in real time. It solves the problem that water cooling systems mostly use fixed flow control, which cannot adjust the heat dissipation capacity according to the real-time operating conditions of the motor, resulting in the dual problems of "insufficient heat dissipation at low speeds" and "redundant energy consumption at high speeds". Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the feeding device structure of the present invention; Figure 2 This is a schematic diagram of the structure of the feeding device of the present invention after the rotary head is installed; Figure 3 This is a schematic diagram of the thermal balance system structure of the feed device for a mining electric-drive drilling rig according to the present invention; Figure 4 This is a flowchart of the control method for the thermal balance system of the feed device of the mining electric-drive drilling rig of the present invention; Figure 5 This is a flowchart of the control method for the thermal balance system of the feed device of the mining electric-drive drilling rig of the present invention; 1-Rear support column, 2-Feed motor, 3-Panel, 4-Screw drive system, 5-Frame, 6-Mounting platform, 7-Front support column, 8-Reducer, 9-Rotator, 10-Rear buckle, 11-New drill rod, 12-Clamper, 13-Front buckle, 14-Unlocker, 15-Bottom hole drill rod, 16-Thermal management system interface, 17-Tension displacement sensor. 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] Combination Figure 1-5The thermal balance system for the feed device of the mining electric-drive drilling rig of the present invention includes a transmission system comprising: a feed device, a frame 5 for which one side is a sliding surface for mounting a support plate 3; a screw transmission system 4 axially mounted inside the frame 5 and connected to the support plate 3; a feed motor 2 and a reducer 8 axially mounted on the frame 5, the reducer 8 driving the screw transmission system 4 via a coupling; a rear support column 1 mounted at the rear end of the frame 2 and a front support column 7 mounted at the front end; a thermal management system and a control system; the thermal management system includes a cooling water pump, a cooling water circuit, a cooling water tank, and a proportional solenoid valve, which collects data through a flow meter and a temperature sensor to monitor the temperature of the transmission system and thereby adjust the cooling water flow rate; the control system is used to analyze the thermal state data collected by the thermal management system in real time and execute the cooling resource allocation logic. The rear support column 1 and the front support column 7 have similar structures, both consisting of a hydraulic cylinder, a telescopic rod, and a grounding device. During construction, the number of telescopic rods can be adjusted as required to ensure the structure's front and rear supports are secure. The feed motor 2 is a permanent magnet synchronous motor, and the main shaft drives the screw transmission system 4 via a coupling. The screw transmission system 4 is a ball screw or planetary screw structure, connected to the support plate 3 via a flange, thereby driving the support plate 3 to move back and forth. The thermal balance system of the mining electric-driven drilling rig feed device of this invention includes a transmission system, a thermal management system, and a control system. The transmission system includes an electric cylinder, a dual-speed ratio reducer, a braking unit, etc., driven by a permanent magnet synchronous motor. The thermal management system includes a water pump, cooling water circuit, cooling water tank, proportional solenoid valve, etc. Data is collected through flow meters and temperature sensors to monitor system temperature, and precise flow regulation is used to achieve system heat dissipation. The control system is used to analyze thermal state data in real time and execute cooling resource allocation logic.

[0021] In this invention, the feed motor 2 is a permanent magnet synchronous motor, and the reducer 8 is an adjustable speed reducer, which drives the screw transmission system 4 through a coupling. The screw transmission system 4 has a ball screw or planetary screw structure and is connected to the support plate 3 through a flange, thereby driving the support 3 to move back and forth. The feed motor used in this invention is a permanent magnet synchronous motor, which serves as the drive source for the feed device and is connected to the input end of the dual-speed ratio reducer through bolts and cylindrical pins. The dual-speed ratio reducer is bolted to the feed machine body, and the output end of the reducer is connected to the transmission screw through a coupling. Both ends of the transmission screw are fixed to the inner part of the feed machine body through bearings and bearing seats, and the other end of the screw is connected to the brake through a spline. Figure 1 As shown. The brake is mainly used to brake when not feeding or pulling to prevent the slide and rotary head from slipping unexpectedly. The feed device has three working modes: horizontal drilling, elevation drilling, and depression drilling. When drilling the same depth, the required feed force is different under different modes, and the heat generated by the feed motor is different.

[0022] In this invention, the adjustable speed reducer includes a reduction ratio of... The first gear working mode and reduction ratio are The second working mode is controlled by a solenoid valve; the first working mode is the low-speed mode, used for deep hole drilling and drill bit lifting operations. When in gear, the system output speed is The second gear is the high-speed mode, used for the rotary head to move backward and leave space during rod addition operations, and for the rotary head to move forward and retrieve the rod during rod unloading operations; the system output speed is... , This is the rated speed of the motor, expressed in r / min. This indicates the rated speed coefficient. The speed reducer used in this invention is an adjustable speed reducer, including those with a reduction ratio of... The first gear working mode and reduction ratio are The second working mode is hereinafter referred to as the first and second gears. Switching between the two gears requires control via a solenoid valve, and the transmission system must be stopped during gear switching. The first gear is the low-speed gear, outputting low speed and high torque, mainly suitable for deep hole drilling and drill bit lifting operations. The second gear is the high-speed gear, outputting high speed and low torque, suitable for situations where the rotary head moves backward to leave space during rod addition operations and for situations where the rotary head moves forward to retrieve the rod during rod removal operations. Its low-speed mode... When in gear, the system output speed is It is in high gear At that time, the system output speed is , This is the rated speed of the motor. That is, the actual output speed of the motor. This is the optimal speed range for the motor. It is currently in the low-speed gear. At that time, the system generates a lot of heat.

[0023] In this invention, a rotary device 9 is installed on the support plate 3; a mounting platform 6 is provided on the front end face of the frame 5, which is in contact with the sliding surface, for installing the clamp 12 and the uncoupling device 14. A rear buckle 10 is installed at the rear end of the rotary device 9, and a front buckle is between the clamp 12 and the uncoupling device 14. The clamp 12 holds the newly added drill rod 11, and the bottom drill rod 15 is located behind the uncoupling device 14. The cooperation of the above components enables the replacement of the drill rod and the drilling operation.

[0024] In this invention, under the operating conditions of the feed system, the control system controls the flow rate of the motor cooling water. He is the cooling flow rate of the speed reducer After obtaining the cooling water flow rate of the feed system, the cooling water flow rate of the thermal management system is dynamically adjusted and distributed. Both the feed motor 2 and the reducer 8 are equipped with thermal management system interfaces 16, which are connected to the cooling water of the thermal management system for cooling. Tensile displacement sensors 17 are installed on the side of the frame 5 to determine the current operating condition of the system based on displacement data, specifically including: First thermal load parameters of the feed system Including the thermal load of the feed motor and the thermal load of the reducer Its feed system temperature threshold includes the feed motor temperature threshold. and reducer temperature threshold ; Feed motor thermal load This includes the theoretical heat generation of the feed motor. and the actual heat generation of the feed motor based on temperature sensor data ; Theoretical heat generation of the feed motor for: ; In the formula: To provide the theoretical heat generated by the feed motor, W ; This represents the actual output power of the motor. W ; This represents the actual working efficiency of the feed motor at speed n; Based on the actual heat generation of the feed motor collected by the temperature sensor for: ; In the formula: Specific heat capacity of motor material, J / (kg) ℃); The total mass of the heating components of the motor is expressed in kg. The change in temperature read by the sensor is expressed in °C. The time interval corresponding to the temperature change is in seconds (s). The heat removed by the thermal management system is the thermal load of the feed motor. : ; The coolant flow rate of the instantaneous heating management system is: ; Theoretical heat generation of the motor Actual heat generation corresponding to sensor temperature The value selected from; The motor cooling water flow rate, in L / min, is the target parameter that is dynamically adjusted. Specific heat capacity of the cooling medium, J / (kg) ℃); The density of the cooling medium is expressed in kg / L. The allowable temperature rise of the cooling medium, in °C, is: + ≤ ; Dynamically adjust the coolant flow rate by acquiring parameters in real time, such as the current engine speed n and the temperature sensor temperature. Ambient temperature and time interval By calculating the theoretical heat generation of the motor Actual heat generation corresponding to sensor temperature Select the target heat that needs to be dissipated. ; like ; but: ; The error threshold can be set according to the actual working conditions; like ; but: ; Finally, the motor cooling water flow rate is dynamically calculated. This yields the optimal flow rate at the current rotational speed. The heat generated by the speed reducer comes from gear meshing and bearing heating, i.e., the total heat output. : ; Total heating power, W ; For the input power of the speed reducer, W ; For the speed reducer at the reduction ratio The efficiency of the lower; For bearing power loss, W ; ; The bearing friction torque is N. m; Angular velocity of the axis, in rad / s; According to the principle of thermal balance, the heat dissipation is: ; The coolant flow rate of the reducer is expressed in L / min. The density of the cooling medium is expressed in kg / L. Specific heat capacity of the cooling medium, J / (kg) ℃); The change in temperature is expressed in °C. + ≤ ; in For the target temperature, The initial ambient temperature; The cooling flow rate of the feed system is: .

[0025] In this invention, under the driller's mode, the priority of the feed system operating condition and the priority of the driller's mode operating condition are set according to the principle of dynamic allocation of thermal balance. Feed system operating priority, feed system cooling flow rate When the feed system cooling flow rate is at its maximum, the heat removed by the feed cooling system in real time is less than the heat dissipated by the transmission system. Therefore, priority should be given to ensuring the cooling flow rate of the feed motor. ,Right now: ; and This represents the actual cooling flow rate of the motor and reducer. To provide the maximum cooling flow rate to the system; The driller's operating mode priority is determined based on the actual operating conditions when the feed system and rotary system are working simultaneously, with the feed system in heavy load mode. At the same time, priority should be given to ensuring the supply system. When the rotary system is in high-speed cutting condition, priority should be given to ensuring the supply of the rotary system. Supply, i.e. , The flow rate required by the rotary system; if both are in priority mode, the system with the larger ratio is prioritized based on the ratio of real-time temperature detection data to its respective temperature threshold. ; , To provide the system with real-time temperature and temperature threshold, , Given the real-time temperature and temperature threshold of the rotary system, and: ; For the cooling flow rate of the hydraulic system circuit, This represents the maximum cooling flow rate of the entire system.

[0026] Combination Figure 4 and 5 The present invention discloses a control method for the thermal balance system of the feed device of a mining electric-drive drilling rig. The method utilizes the thermal balance system of the feed device of the mining electric-drive drilling rig to perform control, including: The control system dynamically adjusts the cooling water flow rate via a proportional solenoid valve, thereby adjusting the thermal management system's response to the thermal load on the feed motor. and the thermal load of the reducer The distribution amount yields the cooling water flow rate of the feed system as follows: ; The coolant flow rate of the reducer is expressed in L / min. The value is the motor cooling flow rate, in L / min.

[0027] With the rotary head operating synchronously, the control system sets the priority of the feed system and the priority of the driller's mode respectively according to the principle of dynamic heat balance allocation. The feed system operating conditions are prioritized, and the control system regulates the thermal management system to distribute heat to the feed system, so that the cooling water flow rate of the feed system is in the optimal state. In driller mode, the first thermal load parameter of the feed system and the second heat load parameters of the slewing system As two independent thermal control subsystems, the auxiliary hydraulic system Both the traveling and drilling modes participate in system operations, and all of the above systems are connected to the total cooling resources for dynamic allocation; when the feed system and the rotary system are working simultaneously, the cooling supply is determined according to the actual working conditions; if both are in priority working conditions, the determination is made based on the ratio of real-time temperature detection data to their respective temperature thresholds.

[0028] For example, the control system dynamically adjusts the cooling flow rate through proportional solenoid valves based on different operating states, thereby adjusting the heat dissipation of the thermal management system for different subsystems. The ideal state of the cooling flow rate is: Heat dissipation = system heat generation.

[0029] Based on the time-sharing multiplexing thermal balance control logic of the whole machine, the preset total cooling resources of the whole machine are: In driller mode, the first thermal load parameter of the feed system and the second heat load parameters of the slewing system As two independent thermal control subsystems, the auxiliary hydraulic system (Mainly includes the hydraulic drive of rear support column 1, front support column 7, clamp 12 and unhooking device 14), which participate in system operation in both travel and driller modes. All of the above systems are connected to the total cooling resources for dynamic allocation.

[0030] First thermal load parameters of the feed system Mainly includes the thermal load of the feed motor and the thermal load of the dual-speed ratio reducer Thermal load on the feed motor The theoretical heat output of the feed motor is defined as the heat generated at different speeds. and the actual heat generation of the feed motor based on temperature sensor data Two types.

[0031] Theoretical heat generation of the feed motor for: ; In the formula: Theoretical calorific value W This refers to the total heat loss of the motor. The actual output power of the motor W , This represents the actual working efficiency of the feed motor at speed n; that is: ; In the formula: N is the motor torque. m; For rotational speed, r / min ; Actual heat generation of the feed motor for: ; In the formula: This represents the actual heat generated corresponding to the sensor temperature. W ; Specific heat capacity of motor material, J / (kg) ℃); The total mass of the heating components of the motor is expressed in kg. The change in temperature read by the sensor is expressed in °C. The time interval corresponding to the temperature change is in seconds (s). ; in The current motor sensor temperature, The initial ambient temperature; The amount of heat removed is: ; That is, the cooling flow rate is: ; In the formula: Heat removed by the cooling system ( W ); Ideally: ; Theoretical heat generation of the motor Actual heat generation corresponding to sensor temperature The value selected from; The target parameter is the motor cooling flow rate in L / min, which is dynamically adjusted. Specific heat capacity of the cooling medium (J / (kg)) ℃); The density of the cooling medium is expressed in kg / L. The allowable temperature rise of the cooling medium is ℃, that is: + ≤ ; Dynamically adjust the cooling flow rate by acquiring parameters in real time, such as the current engine speed n and the temperature sensor temperature. and ambient temperature Feed motor temperature threshold ; By calculating the theoretical heat generation of the motor Actual heat generation corresponding to sensor temperature Select the target heat that needs to be dissipated. .

[0032] like ; but: ; The error threshold can be set according to the actual working conditions.

[0033] like ; but: ; Finally, the cooling flow rate is dynamically calculated. This yields the optimal flow rate at the current rotational speed.

[0034] The heat generated by the speed reducer comes from the heat generated by gear meshing and bearings, which is the total heat output. : ; Total heating power W ; Input power to the speed reducer W ; For the speed reducer at the reduction ratio The efficiency of the lower; For bearing power loss W ; ; Bearing friction torque N m, The angular velocity of the axis is rad / s; According to the principle of thermal balance, the heat dissipation is: ; Cooling flow rate of the reducer (L / min): The density of the cooling medium is expressed in kg / L. Specific heat capacity of the cooling medium (J / (kg)) ℃); The change in temperature is expressed in °C. + ≤ ; in For the target temperature, The initial ambient temperature and the gearbox temperature threshold. ; Finally, the overall cooling flow rate of the feed system under different motor speeds and different reduction ratios is: ; Based on the principle of dynamic allocation of thermal balance, the priority of the feed system operating conditions and the priority of the driller's mode operating conditions are set respectively.

[0035] Feed system operating condition priority, i.e., the cooling flow rate of the feed system when special operating conditions such as stall occur. When the feed system cooling flow rate is at its maximum, the heat removed by the feed cooling system in real time is less than the heat dissipated by the transmission system. Therefore, priority should be given to ensuring the cooling flow rate of the feed motor. ,Right now ; and This represents the actual cooling flow rate of the motor and reducer. To provide the maximum cooling flow rate to the system.

[0036] The driller's operating mode priority is determined based on the actual operating conditions when the feed system and rotary system are working simultaneously, with the feed system in heavy load mode. At the same time, priority should be given to ensuring the supply system. When the rotary system is in high-speed cutting condition, priority should be given to ensuring the supply of the rotary system. Supply, i.e. , This is the flow rate required by the rotary system. If both are in priority mode, the system with the larger ratio is prioritized based on the ratio of real-time temperature monitoring data to its respective temperature threshold. ; , To provide the system with real-time temperature and temperature threshold, , For the real-time temperature and temperature threshold of the rotary system, and ; For the cooling flow rate of the hydraulic system circuit, This represents the maximum cooling flow rate of the entire system. If a temperature sensor malfunction error occurs, a warning should be issued, and the transmission system needs to be shut down for maintenance.

[0037] (1) The wide-range adjustable speed electric drive feed device proposed in this invention controls the switching of the appropriate speed ratio of the reducer under different working conditions through the electromagnetic valve, so as to achieve the effect of expanding the adjustable range of the final speed, so as to meet the different working conditions during drilling operations, effectively reduce the drive motor to be in a state of much greater or less than the non-rated speed for a long time, and avoid the motor to work in a low-efficiency and high-heat state for a long time. (2) The working process of the electric-driven drilling rig mainly includes the driller mode and the traveling mode. In the traveling mode, the drilling rig will travel to the designated drilling position; while in the driller mode, the drilling rig will stop at the designated work position to drill. Only one mode is working at any given time in the driller mode and the traveling mode, and the two modes have the characteristic of time-sharing operation; while the driller mode mainly involves the coordinated operation of the whole machine's hydraulic auxiliary system, slewing system and feed system. This invention is based on the time-sharing multiplexing thermal balance control system of the electric-driven drilling rig, that is, the total control system allocates a basic cooling water flow rate to each motor. For different working conditions of the driller mode, a quantitative model based on feedback current is established for the dual reduction ratio feed device to predict heat, dynamically adapt and adjust in real time to achieve precise thermal balance control and solve the problem of local overheating under cross-working conditions.

[0038] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A thermal balance system for the feed device of a mining electric-drive drilling rig, characterized in that, A transmission system is provided, which includes: a feeding device, a frame (5) for the feeding device, one side of the frame (5) being a sliding surface for mounting the pallet (3); a screw transmission system (4) is provided axially inside the frame (5) and connected to the pallet (3); a shaft-connected feeding motor (2) and a reducer (8) are provided on the frame (5), and the reducer (8) drives the screw transmission system (4) to move through a coupling; a rear support column (1) is installed at the rear end of the frame (2), and a front support column (7) is installed at the front end; A thermal management system and a control system are also provided; the thermal management system includes a cooling water pump, a cooling water circuit, a cooling water tank and a proportional solenoid valve, and collects data through a flow meter and a temperature sensor to monitor the temperature of the transmission system and thereby adjust the cooling water flow. The control system is used to analyze the thermal status data collected by the thermal management system in real time and execute the cooling resource allocation logic.

2. The thermal balance system for the feed device of a mining electric-drive drilling rig according to claim 1, characterized in that, The feed motor (2) is a permanent magnet synchronous motor, and the reducer (8) is an adjustable speed reducer, which drives the screw transmission system (4) to move through the coupling; The lead screw transmission system (4) is a ball screw or planetary screw structure, which is connected to the support plate (3) through a flange, thereby driving the support (3) to move back and forth.

3. The thermal balance system for the feed device of a mining electric-drive drilling rig according to claim 2, characterized in that, The adjustable speed reducer includes a reduction ratio of The first gear working mode and reduction ratio are The second gear working mode requires switching between the two gears via a solenoid valve. The first gear working mode is low speed, used for deep hole drilling and drill lifting operations; It is at a low speed When in gear, the system output speed is ; The second gear is the high-speed mode, used for the rotary head to move backward and leave space during rod addition operations, and for the rotary head to move forward and retrieve the rod during rod removal operations; the system output speed is... , This is the rated speed of the motor, expressed in r / min. This indicates the rated speed coefficient.

4. The thermal balance system for the feed device of a mining electric-drive drilling rig according to claim 1 or 2, characterized in that, A rotary device (9) is installed on the pallet (3); A mounting platform (6) is provided on the front end face of the frame (5) in contact with the sliding surface for mounting the clamp (12) and the unscrew (14).

5. The thermal balance system for the feed device of a mining electric-drive drilling rig according to any one of claims 1-4, characterized in that, Under the operating conditions of the feed system, the control system controls the flow rate of the motor cooling water. He is the cooling flow rate of the reducer After obtaining the cooling water flow rate of the feed system, the cooling water flow rate of the thermal management system is dynamically adjusted and distributed, specifically including: First thermal load parameters of the feed system Including the thermal load of the feed motor and the thermal load of the reducer Its feed system temperature threshold includes the feed motor temperature threshold. and reducer temperature threshold ; Feed motor thermal load This includes the theoretical heat generation of the feed motor. and the actual heat generation of the feed motor based on temperature sensor data ; The theoretical heat generation of the feed motor is as follows for: ； In the formula: To feed the theoretical heat generated by the motor, W ; This represents the actual output power of the motor. W ; This represents the actual working efficiency of the feed motor at speed n; Based on the actual heat generation of the feed motor collected by the temperature sensor for: ； In the formula: Specific heat capacity of motor material, J / (kg) ℃); The total mass of the heating element of the motor is expressed in kg. The change in temperature read by the sensor is expressed in °C. The time interval corresponding to the temperature change is in seconds (s). The heat removed by the thermal management system is the thermal load of the feed motor. : ； The coolant flow rate of the instantaneous heating management system is: ； Theoretical heat generation of the motor Actual heat generation corresponding to sensor temperature The value selected from; The motor cooling water flow rate, in L / min, is the target parameter that is dynamically adjusted. Specific heat capacity of the cooling medium, J / (kg) ℃); The density of the cooling medium is expressed in kg / L. The allowable temperature rise of the cooling medium, in °C, is: + ≤ ； Dynamically adjust the coolant flow rate, that is, by acquiring parameters in real time, such as the current engine speed n and the temperature sensor temperature. Ambient temperature and time interval By calculating the theoretical heat generation of the motor Actual heat generation corresponding to sensor temperature Select the target heat that needs to be dissipated. ; like ； but: ； The error threshold can be set according to the actual working conditions; like ； but: ； Finally, the motor cooling water flow rate is dynamically calculated. This yields the optimal flow rate at the current rotational speed. The heat generated by the speed reducer comes from gear meshing and bearing heating, i.e., the total heat output. : ； Total heating power, W ; For the input power of the speed reducer, W ; For the speed reducer at the reduction ratio The efficiency of the lower; For bearing power loss, W ; ； The bearing friction torque is N. m; Angular velocity of the axis, in rad / s; According to the principle of thermal balance, the heat dissipation is: ； The coolant flow rate of the reducer is expressed in L / min. The density of the cooling medium is expressed in kg / L. Specific heat capacity of the cooling medium, J / (kg) ℃); The change in temperature is expressed in °C. + ≤ ； in For the target temperature, The initial ambient temperature; The cooling flow rate of the feed system is: 。 6. The thermal balance system for the feed device of a mining electric-drive drilling rig according to claim 5, characterized in that, In driller mode, the priority of feed system operating conditions and driller mode operating conditions are set separately according to the principle of dynamic allocation of heat balance. The feed system operating priority, feed system cooling flow rate When the feed system cooling flow rate is at its maximum, the heat removed by the feed cooling system in real time is less than the heat dissipated by the transmission system. Therefore, priority should be given to ensuring the cooling flow rate of the feed motor. ,Right now: ； and This represents the actual cooling flow rate of the motor and reducer. To provide the maximum cooling flow rate to the system; The drilling mode operating condition priority is determined based on the actual operating conditions when the feed system and rotary system are working simultaneously, with the feed system in heavy load mode. At the same time, priority should be given to ensuring the supply system. When the rotary system is in high-speed cutting condition, priority should be given to ensuring the supply of the rotary system. Supply, i.e. , The flow rate required by the rotary system; if both are in priority mode, the system with the larger ratio is prioritized based on the ratio of real-time temperature detection data to its respective temperature threshold. ； , To provide the system with real-time temperature and temperature threshold, , Given the real-time temperature and temperature threshold of the rotary system, and: ； For the cooling flow rate of the hydraulic system circuit, This represents the maximum cooling flow rate of the entire system.

7. A control method for the thermal balance system of the feed device of a mining electric-drive drilling rig, characterized in that, Controlled by the thermal balance system of the feed device of the mining electric-drive drilling rig according to any one of claims 1-6, specifically including: The control system dynamically adjusts the cooling water flow rate via a proportional solenoid valve, thereby adjusting the thermal management system's response to the thermal load on the feed motor. and the thermal load of the reducer The distribution amount yields the cooling water flow rate of the feed system as follows: ； The coolant flow rate of the reducer is expressed in L / min. The value is the motor cooling flow rate, in L / min.

8. The control method for the thermal balance system of the feed device of a mining electric-drive drilling rig according to claim 7, characterized in that, Based on the principle of dynamic thermal balance allocation, the control system sets the priority of the feed system operating conditions and the priority of the driller's mode operating conditions respectively. The feed system operating conditions are prioritized, and the control system regulates the thermal management system to distribute heat to the feed system, so that the cooling water flow rate of the feed system is in the optimal state. In driller mode, the first thermal load parameter of the feed system and the second heat load parameters of the slewing system As two independent thermal control subsystems, the auxiliary hydraulic system Both the traveling and drilling modes participate in system operations, and all of the above systems are connected to the total cooling resources for dynamic allocation; when the feed system and the rotary system are working simultaneously, the cooling supply is determined according to the actual working conditions; if both are in priority working conditions, the determination is made based on the ratio of real-time temperature detection data to their respective temperature thresholds.

Images