Mine ball mill bearing bush cooling water circulation system

Abstract

The utility model belongs to the field of ball mill bearing bush cooling, and relates to a mine ball mill bearing bush cooling water circulation system which comprises a water inlet pool, a ball mill bearing bush and a water storage pool, a water outlet of the water inlet pool is communicated with a water inlet of the ball mill bearing bush, and a water outlet of the ball mill bearing bush is communicated with a water inlet of the water storage pool. The water outlet of the water storage tank is communicated with the water inlet of the water inlet tank; a water inlet of the water inlet tank is positioned at the top of the water inlet tank, and a water outlet of the water inlet tank is positioned below the water inlet tank; a water inlet of the water storage tank is positioned at the lower part of the water storage tank, and a water outlet of the water storage tank is positioned at the lower part of the water storage tank and is positioned on the opposite side of the water inlet of the water storage tank; meanwhile, the water inlet of the water inlet tank is also connected with a municipal water inlet pipeline. According to the system, automatic control over cooling water circulation of the ball mill bearing bush is achieved based on a PLC control program.

Description

Technical Field

[0001] The utility model belongs to the field of ball mill bearing cooling and relates to a bearing cooling water circulation system for a mine ball mill. Background Art

[0002] Considering the importance of temperature protection for the vacuum carbon graphite bearings of the ball mill, the cooling method for the bearings during operation is mainly to conduct heat away from the internal heat by circulating water, thereby achieving a heat dissipation effect. Normally, the water source is production water, but the production water contains many impurities, which has a poor cooling effect on the ball mill bearings. At present, the cooling water for the ball mill bearings in the mine is cooled by municipal tap water, which is free of impurities. When the ball mill is running for a long time, the bearing cooling device will not scale, and the overall ball mill bearing temperature cooling effect is relatively good. According to production needs, the mine has 5 ball mills for reuse. The municipal water consumption is large and the operating cost is high. To overcome this, our mine installed a water storage pool and a water inlet pool to conduct a feasibility study on the comprehensive recovery, circulation, automatic control and reuse of the ball mill cooling water.

[0003] At present, when the water storage pool or water inlet pool is full or short of water, personnel need to manually start and stop the booster water pump. If the inspection is not timely, it is easy to cause the pool to overflow, or the pump to run dry due to lack of water, causing damage to the water pump equipment, waste of municipal water resources and lack of water for bearing cooling water. After the water shortage occurs, if the water is not replenished in time, it will further cause the ball mill bearing temperature to be high, the ball mill bearing to burn, etc. Utility Model Content

[0004] The present application provides a mining ball mill bearing cooling water circulation system, which realizes automatic control of the ball mill bearing cooling water circulation based on a PLC control program.

[0005] To achieve the above technical objectives, the technical solution adopted by the present application is as follows: a mining ball mill bearing cooling water circulation system, comprising a water inlet pool, a ball mill bearing, and a water storage pool, wherein the water outlet of the water inlet pool is connected to the water inlet of the ball mill bearing, the water outlet of the ball mill bearing is connected to the water inlet of the water storage pool, and the water outlet of the water storage pool is connected to the water inlet of the water inlet pool;

[0006] The water inlet of the water inlet pool is located at the top of the water inlet pool, and the water outlet of the water inlet pool is located below the water inlet pool; the water inlet of the water storage pool is located at the lower part of the water storage pool, and the water outlet of the water storage pool is located at the lower part of the water storage pool and on the opposite side of the water inlet of the water storage pool;

[0007] At the same time, the water inlet of the water inlet pool is also connected to a municipal water inlet pipeline.

[0008] As an improved technical solution of the present application, a municipal water inlet pipe is provided on the top of the water inlet pool, and a water inlet pool level gauge is installed just above the center of the water inlet pool.

[0009] As an improved technical solution of the present application, a municipal water inlet pipe is provided on the top of the water storage tank, and a water storage tank level gauge is installed directly above the center of the water storage tank.

[0010] As an improved technical solution of the present application, the pipe connecting the water outlet of the water inlet pool to the water inlet of the ball mill bearing is provided with a water inlet pool electric water valve, a water inlet pool booster pump and a water inlet temperature sensor.

[0011] As an improved technical solution of the present application, the pipe connecting the water outlet of the water storage tank to the water inlet of the water inlet tank is provided with a water storage tank electric water valve, a water storage tank booster pump, and a water storage temperature sensor.

[0012] As an improved technical solution of the present application, a municipal water inlet electric water valve is provided on the municipal water inlet pipe.

[0013] Beneficial effects

[0014] This application designs a water inlet pool and a water storage pool on the water inlet side and the water outlet side of the ball mill bearing respectively. The water inlet pool, the ball mill bearing and the water storage pool form a cooling water circulation, and use municipal water to supplement the cooling water, so as to realize the recycling of the cooling water of the ball mill bearing and the automatic replenishment of municipal water after the natural evaporation loss of the cooling water, thereby saving water and reducing water costs.

[0015] This application designs a water inlet pool and a water storage pool on the water inlet side and the water outlet side of the ball mill bearing respectively, and installs a liquid level gauge, temperature sensor, etc. on the water inlet pool and the water storage pool respectively. After obtaining the data of the liquid level gauge and temperature sensor through an external PLC control system, the operation of the water inlet pool electric valve and the water storage pool electric valve is controlled to realize automatic circulation of cooling water for the ball mill bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Draw a schematic diagram showing the structure of the application system;

[0017] In the figure, 1. Municipal water inlet pipe; 2. Water storage tank circulating water pipe; 3. Municipal water inlet electric water valve; 4. Water inlet tank level gauge; 5. Water storage tank level gauge; 6. Water inlet tank; 7. Water storage tank; 8. Ball mill bearing; 9. Water inlet tank booster pump; 10. Water storage tank booster pump; 11. Water inlet temperature sensor; 12. Water storage temperature sensor; 13. Water inlet tank electric water valve; 14. Water storage tank electric water valve. DETAILED DESCRIPTION

[0018] The technical solution of this application is clearly and completely described below with reference to the accompanying drawings.

[0019] like Figure 1As shown, a cooling water circulation system for a ball mill bearing is shown, comprising an inlet pool 6, a ball mill bearing 8, and a water storage pool 7. The inlet pool 6 and the water storage pool 7 are designed to ensure that the water inlet pool 6 ensures the water supply and buffering capacity of the ball mill bearing 8, while the water storage pool 7 stores water for cooling when the water inlet pool 6 is sufficient and to promptly increase the pressure to replenish water in the inlet pool 6 when the water level is insufficient.

[0020] The outlet of the water inlet pool 6 is connected to the water inlet of the ball mill bearing 8, the outlet of the ball mill bearing 8 is connected to the water inlet of the water storage pool 7, and the outlet of the water storage pool 7 is connected to the water inlet of the water inlet pool 6. The water inlet of the water inlet pool 6 is located at the top of the water inlet pool 6, and the water outlet of the water inlet pool 6 is located at the bottom of the water inlet pool 6. The purpose is to ensure that the water inlet is from top to bottom, the upper water inlet reduces the water inlet pressure, and the lower water outlet increases its own water outlet pressure, thereby reducing the boost load of the boost pump; the water inlet of the water storage pool 7 is located at the bottom of the water storage pool 7, and the water outlet of the water storage pool 7 is located at the bottom of the water storage pool 7 and on the opposite side of the water inlet of the water storage pool 7. The purpose is that the cooling water of the ball mill bearing 8 is warm water after cooling. The water inlet and outlet are arranged at the bottom to take advantage of the lower temperature of the bottom of the water storage pool 7 itself to play a role in cooling the cooling water.

[0021] At the same time, the water inlet of the water inlet pool 6 is also connected to the municipal water inlet pipe 1.

[0022] In order to facilitate external PLC system control, preferably, a municipal water inlet pipe 1 is provided on the top of the water inlet pool 6, and a water inlet pool level gauge 4 is installed directly above the center of the water inlet pool 6. The purpose is to provide the PLC system with real-time data on the liquid level of the water inlet pool 6, so as to determine whether the water storage pool 7 is being filled with water or whether the municipal water supply is being replenished.

[0023] A municipal water inlet pipe 1 is installed at the top of the water reservoir 7, and a water reservoir level gauge 5 is installed directly above the center of the water reservoir 7. This gauge provides the PLC system with real-time data on the water reservoir 7, allowing it to determine whether to stop the water reservoir booster pump 10 when the water level is low, or whether to start the water reservoir booster pump 10 when the water level is high, based on the liquid level in the water inlet tank 6.

[0024] The pipe connecting the outlet of the water inlet pool 6 to the water inlet of the ball mill bearing 8 is equipped with an electric water valve 13 for the water inlet pool, a water inlet booster pump 9, and an inlet water temperature sensor 11. The purpose is to provide the PLC system with the water temperature at the outlet of the water inlet pool 6 and monitor the inlet water temperature in real time. The electric water valve serves to remotely close the valve when the ball mill bearing 8 is cooled in winter, saving water. The order of installation is the electric valve for the water inlet pool (electric water valve 13 for the water inlet pool), the booster pump 9 for the water inlet pool, and the inlet water temperature sensor 11. This is because the electric valve for the water inlet pool should be installed at the front end first, which facilitates subsequent pipeline inspection and maintenance. The inlet water temperature sensor 11 should be installed at the rear end of the booster pump 9 for the water inlet pool. During use, the booster pump 9 itself will generate a certain amount of heat. The inlet water temperature sensor 11 installed at the rear end can detect the water temperature of the entire water in the water inlet pool 6 after it is pressurized by the booster pump 9.

[0025] The pipe connecting the outlet of the water reservoir 7 to the inlet of the water inlet 6 is equipped with a water reservoir electric valve 14, a water reservoir booster pump 10, and a water temperature sensor 12. This is to provide the PLC system with the outlet water temperature of the water reservoir 7 and monitor the water temperature in real time. The water reservoir electric valve 14 serves to remotely shut down the water reservoir booster pump 10 during maintenance and replacement, or when the equipment is not in use for cooling in winter, thereby saving water. The order of installation is the water reservoir electric valve (water reservoir electric valve 14), water reservoir booster pump 10, and water temperature sensor 12. The water reservoir electric valve is installed first, facilitating subsequent equipment maintenance. The water temperature sensor 12 is installed at the rear end of the water reservoir booster pump 10. During normal use, the water reservoir booster pump 10 generates a certain amount of heat. Installing the water temperature sensor 12 at the rear end allows the water in the entire water reservoir 7 to be measured after being pressurized by the water reservoir booster pump 10.

[0026] The municipal water inlet pipe 1 is provided with a municipal water inlet electric valve 3, the main purpose of which is to give a water level signal to the PLC system when the liquid levels of the water storage tank 7 and the water inlet tank 6 are not high, and to replenish water by remotely and automatically opening the municipal water inlet electric valve 3.

[0027] The technical solution of this application is clearly and completely described below in conjunction with specific embodiments.

[0028] A bearing cooling water circulation system for a mine ball mill is optimized through PLC control to become an automatic control device for cooling water circulation of a mine ball mill.

[0029] The control system PLC of the device is programmed with Siemens 1200 PLC and supporting DI, DO, AI, and AO modules. The liquid level meter, temperature sensor, and electric valve are used to realize the start and stop control of the booster pump, thereby realizing automatic control of the cooling water circulation of the ball mill bearing 8.

[0030] An automatic control device for cooling water circulation in a mining ball mill includes a main electronic control system, a water inlet booster pump 9, a water storage booster pump 10, a water inlet level gauge 4 (an ultrasonic water inlet level gauge), a water storage level gauge 5 (an ultrasonic water storage level gauge), a water inlet electric valve 13, a water storage electric valve 14, an inlet water temperature sensor 11, a water storage temperature sensor 12, and a frequency converter. The frequency converter provides drive for the two booster pumps.

[0031] An ultrasonic level gauge for the water inlet 6 and the water storage 7 are installed at the center of the cover plates of the water inlet 6 and the water storage 7. A 7.5KW water inlet booster pump 9 is installed at the bottom of the water inlet 6, and a 7.5KW water storage booster pump 10 is installed at the bottom of the water storage 7 (the water inlet booster pump 9 and the water storage booster pump 10 are installed 30 cm behind the electric valve pipe of the water inlet 6 and 30 cm behind the electric valve pipe of the water storage 7 respectively; if the distance is too long, it will be inconvenient to repair and drain the booster pump, and if the distance is too close, it will be inconvenient to replace the valve. A distance of 30 cm is most suitable). The valve installed at the front end of the water inlet booster pump 9 is a DN50 water inlet electric water valve 13, and the valve installed at the front end of the water storage 7 booster pump is a DN50 water storage electric water valve 14; a water inlet temperature sensor 11 is installed at the outlet end of the water inlet 6 booster pump pipe, and a water storage temperature sensor 12 is installed at the outlet end of the water storage booster pump 10 pipe.

[0032] The water inlet pool 6 and the water storage pool 7 are both circular pools with a depth of 6m and an outer diameter of 6m.

[0033] The booster pump control is connected to a frequency converter. The frequency converter, level gauge, electric water valve, and temperature sensor are connected to various points in the automation system for automated control using logic programming. The two level gauges are configured with high, medium, and low ranges of 5m, 3m, and 1m, respectively, while the temperature sensor's high and low ranges are set to 45°C and 20°C. This design aims to improve the efficiency, stability, and safety of the water supply system. The following is a detailed explanation of the design and its core technical principles:

[0034] 1. Design reasons

[0035] 1. Improve water supply efficiency:

[0036] By controlling the speed of the booster water pump through the frequency converter, the flow and pressure of the water pump can be adjusted in real time according to the actual water consumption, avoiding unnecessary energy waste.

[0037] Liquid level gauges and temperature sensors can monitor water level and temperature in real time, ensuring that the water pump operates under optimal conditions and further improving water supply efficiency.

[0038] 2. Enhance system stability:

[0039] Setting the level gauge to high, medium, and low ranges (5m, 3m, and 1m) ensures the system can respond appropriately to varying water levels. For example, when the water level falls below the low range (1m), a backup pump can be automatically activated or an alarm can be sounded. When the water level rises above the high range (5m), the pump flow rate can be automatically reduced or some pumps shut down to prevent overflow.

[0040] The temperature sensor sets high and low temperature thresholds (45°C and 20°C) to protect the water pump from overheating or overcooling, as well as the safety of the bearing and extend the service life of the equipment.

[0041] 3. Improved security:

[0042] The automatic control of the electric water valve can quickly cut off the water source in an emergency to prevent the accident from escalating.

[0043] Through real-time monitoring and alarming of the automated system, potential safety hazards can be discovered and dealt with in a timely manner.

[0044] 2. Core Technology Principles

[0045] 1. Frequency conversion speed regulation technology:

[0046] A frequency converter (VFD) controls the motor's speed by varying the frequency of the motor's power supply, thereby regulating the pump's flow rate. This technology offers significant energy savings, as pump power is proportional to the cube of the speed. Reducing speed significantly reduces energy consumption. Variable frequency speed regulation systems typically employ closed-loop control, collecting actual flow, pressure, and other parameters and comparing them with set values ​​to automatically adjust the VFD's output frequency to achieve system stability.

[0047] 2. Sensor technology:

[0048] Liquid level gauges and temperature sensors are key components in automation systems. They convert physical quantities (such as liquid level and temperature) into electrical signals for analysis and processing by the automation system. Liquid level gauges typically use ultrasonic and other measurement principles, offering high accuracy and reliability. Temperature sensors use thermal resistors for temperature measurement.

[0049] 3. Logic programming and automatic control:

[0050] Automation systems control individual devices through logic programming. Control logic is written based on actual needs, defining the linkages and response conditions between devices. When the system receives a signal from a sensor, it evaluates and processes it according to pre-set logic, then issues corresponding control instructions to actuators (such as inverters and electric water valves), achieving automatic control.

[0051] 3. Core technical principles that distinguish it from similar technologies

[0052] 1. System architecture design

[0053] System architecture design is a key component of the cooling water circulation control system. This requires a rational design based on actual needs and site conditions. This includes the layout and connection of key components such as the water storage tank 7, water inlet tank 6, booster pump, electric valves, and sensors. Furthermore, system scalability and maintainability are considered.

[0054] 2. Control system design

[0055] The control system is the core of the cooling water circulation system, responsible for automated control of the system. It monitors and controls the system's status in real time, enabling hardware control and data processing. The control system must be highly stable and reliable to ensure normal operation.

[0056] 3. Cooling strategy design

[0057] Design a reasonable cooling strategy based on the equipment's process requirements. This includes determining parameters such as circulating water temperature and pressure, and adjusting the strategy for different operating conditions. Furthermore, consider the regeneration and reuse of cooling water to reduce energy consumption and minimize environmental impact.

[0058] 4. Uniqueness of control mode

[0059] After the PLC automatic control mode is started, when the water inlet tank level gauge 4 and the water storage tank level gauge 5 simultaneously display the low range of 1m, the municipal water inlet electric valve 3 begins to open, and the liquid level of the water inlet tank 6 begins to rise; because the water inlet tank 6 and the water storage tank 7 must have a minimum water level of 1m to prevent the municipal water from being cut off and without water for replenishment, the 1m water level of the two tanks themselves can be used to circulate and cool for a short time through the water storage tank circulating water pipe 2 (the pipe connecting the water storage tank 7 and the water inlet tank 6), ensuring that a part of the water can be recycled before the municipal water is replenished.

[0060] When the water level gauge 5 shows 3m, the electric water valve 13 in the water inlet tank opens. Simultaneously, the automation system controls the frequency converter of the water inlet tank booster pump 9 to start boosting the pressure. After the booster pump increases the pressure, the water in the outlet pipe below the water inlet tank 6 flows through the booster pump, increasing the pressure to 0.4 MPa (normal pressure is 0.2 MPa). This increased pressure accelerates the flow of water through the ball mill bearing 8, allowing for rapid cooling. The cooling water then flows through the ball mill bearing 8 and enters the water reservoir 7.

[0061] When the water level gauge 5 of the water reservoir rises to 3m, the electric water valve 14 of the water reservoir opens. Simultaneously, the automated system controls the inverter of the water reservoir booster pump 10 to increase the pressure, returning the circulated cooling water to the inlet tank 6, thus repeating the cycle. If the water level of the inlet tank 6 reaches 5m, the booster pump 10 of the water reservoir stops pumping water to the inlet tank 6, and the ball mill cooling water flows to the water reservoir 7 for storage. When the water level of the water reservoir 7 reaches 5m, the inlet tank 6 is less than 5m, and the booster pump 10 of the water reservoir starts pumping water to the inlet tank 6. The water levels of the water reservoirs 7 and 6 will not reach 5m because the liquid levels of the two tanks are below 1m. After automatic water replenishment by the municipal government, the replenishment stops when the highest water level of the two tanks reaches 4m. This is to leave room for circulation in the two tanks. The cooling water pipeline inside the bearing is equipped with a check valve, which prevents the water in the tail end water reservoir 7 from flowing back into the ball mill bearing 8.

[0062] In this way, the cooling water circulation of the ball mill bearing 8 is automatically controlled, so that the water flow can be kept circulating for a long time and the temperature can be prevented from rising.

[0063] In summary, the technical solution of the present application greatly improves the safety of cooling the ball mill bearing 8; reduces unnecessary waste of municipal water supply, and saves 300,000 cubic meters of municipal water each year, about 600,000 yuan; solves the problem of bearing burning and other failures caused by high bearing cooling water temperature from the source, with each set of bearings worth 500,000 yuan; reduces the workload of employee inspections and uncertain safety factors during the inspection process, etc.

Claims

1. A mining ball mill bearing cooling water circulation system, characterized in that: It includes a water inlet pool, a ball mill bearing and a water storage pool, wherein the water outlet of the water inlet pool is connected to the water inlet of the ball mill bearing, the water outlet of the ball mill bearing is connected to the water inlet of the water storage pool, and the water outlet of the water storage pool is connected to the water inlet of the water inlet pool; The water inlet of the water inlet pool is located at the top of the water inlet pool, and the water outlet of the water inlet pool is located below the water inlet pool; the water inlet of the water storage pool is located at the lower part of the water storage pool, and the water outlet of the water storage pool is located at the lower part of the water storage pool and on the opposite side of the water inlet of the water storage pool; At the same time, the water inlet of the water inlet pool is also connected to a municipal water inlet pipeline.

2. The mining ball mill bearing cooling water circulation system according to claim 1, characterized in that: A municipal water inlet pipe is provided on the top of the water inlet pool, and a water inlet pool level gauge is installed just above the center of the water inlet pool.

3. The mining ball mill bearing cooling water circulation system according to claim 1, characterized in that: A municipal water inlet pipe is provided on the top of the water storage tank, and a water storage tank level gauge is installed just above the center of the water storage tank.

4. The mining ball mill bearing cooling water circulation system according to claim 1, characterized in that: The pipe through which the water outlet of the water inlet pool is connected to the water inlet of the ball mill bearing bush is provided with a water inlet pool electric water valve, a water inlet pool booster pump and a water inlet temperature sensor.

5. The mining ball mill bearing cooling water circulation system according to claim 1, characterized in that: A pipeline connecting the water outlet of the water storage tank to the water inlet of the water inlet tank is provided with a water storage tank electric water valve, a water storage tank booster pump, and a water storage temperature sensor.

6. The mining ball mill bearing cooling water circulation system according to claim 1, characterized in that: The municipal water inlet pipe is provided with a municipal water inlet electric water valve.

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