Centralized air supply device of ball mill

Abstract

The utility model belongs to the field of ball mill gas supply, and relates to a ball mill centralized gas supply device which comprises a dry oil injection system and a pneumatic clutch system. Comprising a screw type air compressor, a dry oil injection air bag and a pneumatic clutch air bag, the screw type air compressor supplies air to the dry oil injection air bag and the pneumatic clutch air bag. The dry oil injection air bag supplies air to the dry oil injection system through a dry oil injection air pipe; the pneumatic clutch air bag supplies air to the pneumatic clutch system through a pneumatic clutch air pipe.

Description

Technical Field

[0001] This utility model belongs to the field of ball mill gas supply and relates to a centralized gas supply device for ball mills. Background Technology

[0002] The ball mill is mainly composed of a feeding section, main bearing, cylinder section, transmission section, main motor, slow speed drive device, pneumatic clutch, dry oil injection and lubrication, and electrical control system.

[0003] Its working principle is as follows: The equipment is driven by a synchronous motor, which drives the cylindrical section to rotate through the transmission unit. When the cylindrical section rotates, the grinding media—steel balls—installed inside the cylindrical section are lifted to a certain height under the action of friction and centrifugal force, and then thrown down at a certain linear velocity. The ore is crushed by the impact of the falling steel balls and by the additional crushing and abrasive action between the steel balls and between the steel balls and the mill. The overflow mill uses the force of water to directly discharge the crushed qualified material outside the cylinder through the hollow shaft.

[0004] As an important component of a ball mill, the pneumatic clutch works as follows: when air pressure is supplied to the air chamber, the chamber expands, and the air pressure is evenly distributed on the friction shoes, thus engaging the drum mounted on the driven element. The friction shoes consist of friction blocks mounted on an aluminum backing plate, and power is transmitted to the side plate via a torque bar. When the air is released, the return spring and centrifugal force ensure that the friction shoes completely disengage from the drum.

[0005] Dry oil injection is also an essential component of ball mills, mainly providing lubrication for the large and small gears to ensure proper lubrication of the gears.

[0006] like Figure 1 As shown, the current air supply method for ball mill pneumatic clutches mostly relies on small air compressors for supplementation. Small air compressors have a high failure rate, and their small capacity means that if they malfunction, they cannot supply air to the ball mill pneumatic clutch. In actual operation, this air supply failure frequently causes ball mill shutdowns, significantly impacting production.

[0007] The air supply method for dry oil injection is mostly to supplement it with a small air compressor. After a failure, the air source cannot be provided to the dry oil pump, which in turn causes dry oil injection failure. With the large-scale use of synthetic oil, dry oil injection needs to be repaired within 2 hours, otherwise the large and small gears will have insufficient oil film, which will damage the large and small gears.

[0008] The frequent malfunctions of these two small air compressors have caused great distress to production stability and the safety of the ball mill equipment. Utility Model Content

[0009] This application provides a centralized air supply device for ball mills, which enables the pneumatic clutch and dry oil injection to be supplied with air by independent air receivers, avoiding pneumatic clutch failure caused by dry oil injection air circuit failure, and solving the problem of frequent failures caused by the use of small air compressors.

[0010] To achieve the above technical objectives, the technical solution adopted in this application is a centralized air supply device for a ball mill, comprising a dry oil injection system and a pneumatic clutch system; including a screw air compressor, a dry oil injection air receiver, and a pneumatic clutch air receiver;

[0011] The screw air compressor supplies air to the dry oil injection air receiver and the pneumatic clutch air receiver respectively;

[0012] The dry oil injection air supply unit supplies air to the dry oil injection system through the dry oil injection air duct;

[0013] The pneumatic clutch air supply unit supplies air to the pneumatic clutch system through the pneumatic clutch air duct.

[0014] As an improved technical solution of this application, it also includes a dryer, wherein the air supplied by the screw air compressor is supplied to the dry oil injection air receiver and the pneumatic clutch air receiver after passing through the dryer.

[0015] As an improved technical solution of this application, it also includes an air receiver check valve. There are two air receiver check valves: one air receiver check valve is located between the screw air compressor and the dry oil injection air receiver; the other air receiver check valve is located between the screw air compressor and the pneumatic clutch air receiver.

[0016] As an improved technical solution of this application, the screw air compressor is arranged in two units, and the two screw air compressors can supply air to the dry oil injection air receiver and the pneumatic clutch air receiver respectively.

[0017] As an improved technical solution of this application, the outlet of the screw air compressor is equipped with an outlet gate valve and a check valve.

[0018] As an improved technical solution of this application, it also includes pressure sensors. There are two pressure sensors, which are located on the dry oil injection duct and the pneumatic clutch duct, respectively.

[0019] As an improved technical solution of this application, the dry oil injection air bag is equipped with an automatic air bag drain valve.

[0020] As an improved technical solution of this application, the pneumatic clutch air bag is provided with an automatic air bag drain valve.

[0021] Beneficial effects

[0022] 1. The technical solution of this application uses a screw air compressor, a dry oil injection air receiver, and a pneumatic clutch air receiver to solve the problem of frequent failures of small air compressors.

[0023] 2. The pneumatic clutch system and the dry oil injection system are supplied with air by independent air receivers to avoid pneumatic clutch failure caused by dry oil injection air circuit failure.

[0024] 3. Online air pressure monitoring: Pressure sensors are added to the outlets of the pneumatic clutch air receiver and the dry oil injection air receiver, and automation is introduced to prevent internal air compressor malfunctions from going undetected in time, ensuring efficient equipment operation.

[0025] 4. Automatic drainage devices (automatic drain valve for air receiver) are added to the dry oil injection air receiver and the pneumatic clutch air receiver, and a dehumidification device (dryer) is added to the screw air compressor outlet: effectively removing moisture from compressed air, protecting the pneumatic clutch and pneumatic valve, and ensuring the dry oil injection air circuit is dry and can be used for a long time.

[0026] 5. Reduce operating and maintenance costs. Air compressor failure can cause the ball mill to stop. The ball mill has a power of up to 1250KW. Starting and stopping it will result in a large amount of material costs. Moreover, after the ball mill stops, the entire ore dressing plant's production process and indicators will fluctuate.

[0027] 6. The equipment operates stably, with a very low failure rate after the modification, effectively ensuring stable equipment operation and thus ensuring stable production. Attached Figure Description

[0028] Figure 1 A schematic diagram of the air supply device before the modification is shown. In the diagram, 1. Ball mill; 2. Pneumatic clutch system; 3. Ball mill brake shoe assembly; 4. Ball mill large and small gears; 5. Dry oil injection system; 6. Dry oil injection small air compressor; 7. Pneumatic clutch small air compressor.

[0029] Figure 2 A schematic diagram of the air supply device of this application is shown; in the diagram, 1 is a ball mill; 2 is a pneumatic clutch system; 3 is a ball mill brake shoe assembly; 4 is a ball mill gear; 5 is a dry oil injection system; 6 is a screw air compressor; 7 is a dryer; 8 is a dry oil injection air receiver; 9 is a pneumatic clutch air receiver; 10 is a dry oil injection air duct; 11 is a pneumatic clutch air duct; 12 is an air receiver check valve; 13 is an air receiver automatic drain valve; and 14 is a pressure sensor. Detailed Implementation

[0030] like Figure 1 As shown, the existing air supply method for the pneumatic clutch of ball mills is mostly to supply it with small air compressors. Small air compressors have a high failure rate and small volume. Once they fail, they cannot supply air to the pneumatic clutch of the ball mill, which often causes the ball mill to stop due to air supply failure, and has a significant impact on production.

[0031] Figure 1 In the middle, there are: 1. Ball mill; 2. Pneumatic clutch system; 3. Ball mill brake shoe assembly; 4. Ball mill large and small gears; 5. Dry oil injection system; 6. Dry oil injection small air compressor; 7. Pneumatic clutch small air compressor.

[0032] To completely solve the above problems, the technical solution proposed in this application is as follows: Figure 2 As shown, all the small air compressors used in the ball mill 1 are eliminated, and a screw air compressor 6 is used for centralized air supply; at the same time, the pneumatic clutch system 2 and the dry oil injection system 5 are supplied with air by independent air units, thereby meeting the production needs.

[0033] The specific design concept is as follows: a centralized air supply device for a ball mill, including a dry oil injection system 5 and a pneumatic clutch system 2; including a screw air compressor 6, a dry oil injection air receiver 8 and a pneumatic clutch air receiver 9; the screw air compressor 6 supplies air to the dry oil injection air receiver 8 and the pneumatic clutch air receiver 9 respectively; the dry oil injection air receiver 8 supplies air to the dry oil injection system 5 through a dry oil injection air pipe 10; the pneumatic clutch air receiver 9 supplies air to the pneumatic clutch system 2 through a pneumatic clutch air pipe 11.

[0034] illustrate:

[0035] The dry oil injection system 5 consumes gas. Each time the dry oil injection system 5 is running, it is necessary to perform a front-blowing and back-blowing action on the outlet pipe. The purpose of the front-blowing and back-blowing action is to blow out the grease in the dry oil injection outlet pipe, which requires a large amount of gas.

[0036] Pneumatic clutch system 2 is a pressure-holding type. The working principle of the pneumatic clutch is that air enters the clutch's air chamber, causing it to inflate and engage the drum mounted on the driven element. This allows the ball mill motor to drive the drum via the air chamber, which in turn drives the pinion gear, ultimately rotating the ball mill's large gear. After the ball mill starts operating, the air chamber must remain fully filled with gas. When the gas level falls below a set value, the pneumatic clutch opens a valve to supply air to the inside. The gas consumption within the air chamber is relatively slow, but some consumption still occurs.

[0037] Considering the different air supply principles of the dry oil injection system 5 and the pneumatic clutch system 2, a dry oil injection air manifold 8 and a pneumatic clutch air manifold 9 are added for independent air supply. This allows for pressure maintenance in the event of an air compressor failure, ensuring normal operation of the ball mill. If only one air manifold is used, a leak in the air pipe of the dry oil injection system 5 would cause fluctuations in the overall air pressure, potentially triggering insufficient pressure detection in the pneumatic clutch system 2 of the ball mill 1, thus causing the ball mill to trip and shut down as a safety measure.

[0038] As an improved technical solution of this application, a dryer 7 is also included. The air supplied by the screw air compressor 6 is then supplied to the dry oil injection air receiver 8 and the pneumatic clutch air receiver 9 after passing through the dryer 7. The compressed air in the screw air compressor 6 contains a certain amount of moisture, which can be removed by the dryer 7.

[0039] As an improved technical solution of this application, it also includes an air receiver check valve 12. There are two air receiver check valves 12, one of which is located between the screw air compressor 6 and the dry oil injection air receiver 8; the other air receiver check valve 12 is located between the screw air compressor 6 and the pneumatic clutch air receiver 9.

[0040] As an improved technical solution of this application, two screw air compressors 6 are arranged. The two screw air compressors 6 can supply air to the dry oil injection air receiver 8 and the pneumatic clutch air receiver 9, respectively. That is, one screw air compressor 6 is on standby, supplying air to the dry oil injection air receiver 8 and the pneumatic clutch air receiver 9. To prevent cross-contamination, an outlet gate valve and a check valve are installed at the outlet of each screw air compressor 6.

[0041] As an improved technical solution of this application, pressure sensors 14 are also included. There are two pressure sensors 14, located on the dry oil injection duct 10 and the pneumatic clutch duct 11, respectively. After the screw air compressor 6 is modified, an air pressure detection device (pressure sensor 14) is added, and a lower limit alarm value is set. Once the screw air compressor malfunctions (e.g., the air compressor motor is running, the coupling is damaged, or the air compressor trips, which the operator cannot know), the air pressure detection device will trigger an alarm. After testing, the 3 cubic meter air receivers (dry oil injection air receiver 8 and pneumatic clutch air receiver 9) added due to the air compressor malfunction can maintain pressure for more than 30 minutes without affecting the operation of the ball mill 1, which is not available in small air compressors.

[0042] As an improved technical solution of this application, the dry oil injection air bag 8 is provided with an automatic air bag drain valve 13.

[0043] As an improved technical solution of this application, the pneumatic clutch air bag 9 is provided with an automatic air bag drain valve 13.

[0044] A more detailed explanation of the technical solution in this application is as follows:

[0045] like Figure 2As shown, a centralized air supply device for a ball mill includes the following components: a ball mill 1, a pneumatic clutch system 2, a ball mill brake shoe assembly 3, ball mill large and small gears 4, a dry oil injection system 5, a screw air compressor 6, a dryer 7, a dry oil injection air receiver 8, a pneumatic clutch air receiver 9, a dry oil injection air duct 10, a pneumatic clutch air duct 11, an air receiver check valve 12, an air receiver automatic drain valve 13, and a pressure sensor 14.

[0046] The screw air compressor 6 supplies air to the dry oil injection air receiver 8 and the pneumatic clutch air receiver 9 respectively; the dry oil injection air receiver 8 supplies air to the dry oil injection system 5 through the dry oil injection air pipe 10; the pneumatic clutch air receiver 9 supplies air to the pneumatic clutch system 2 through the pneumatic clutch air pipe 11.

[0047] When each ball mill 1 is in production, the pneumatic clutch system 2 needs to provide air to the ball mill brake shoe assembly 3. At this time, the air bladder inside the ball mill brake shoe assembly 3 expands, and the air pressure is evenly distributed on the friction shoes, gripping the drum installed on the driven element. The motor drives the ball mill to run, thus putting it into production.

[0048] During the production process, the surfaces of the large and small gears 4 of the ball mill need to be lubricated to prevent meshing failure. At this time, the dry oil injection system 5 will work according to the set time and program to spray grease to lubricate the surfaces of the large and small gears.

[0049] At this time, both the pneumatic clutch system 2 and the dry oil injection system 5 require sufficient air supply. The screw air compressor 6 starts working in advance before the ball mill 1 starts running. The compressed air generated is dried by the dryer 7 and then enters the dry oil injection air receiver 8 and the pneumatic clutch air receiver 9 respectively; then it enters the pneumatic clutch system 2 and the dry oil injection system 5 through the dry oil injection air pipe 10 and the pneumatic clutch air pipe 11 respectively, thus providing the air supply required for the operation of the ball mill 1.

[0050] Among them, two screw air compressors are arranged. During the installation process, outlet gate valves and check valves should be installed at the outlets of the two air compressors to prevent cross-flow of air between the two air compressors.

[0051] Pressure sensors 14 are respectively installed on the dry oil injection duct 10 and the pneumatic clutch duct 11. The main reason is that dry oil injection is a consumable product, while the pneumatic clutch is a pressure-maintaining product, and their operating modes are different. The causes of failures and the solutions are also different. By introducing pressure sensors 14 into automation, synchronous alarms can be set up between the work station and the monitoring room, enabling predictive maintenance.

[0052] In addition, to ensure the stability of this system, accessories such as the air receiver check valve 12, the air receiver automatic drain valve 13, and the pressure sensor 14 were added. Their functions are as follows:

[0053] 1. Air manifold check valve 12: Due to the different working methods and air consumption of the pneumatic clutch system 2 and the dry oil injection system 5, pneumatic clutch air manifold 9 and dry oil injection air manifold 8 are installed on site respectively. To prevent air leakage during operation, air manifold check valve 12 is added.

[0054] 2. Automatic Drain Valve 13 for Air Receivers: During operation, the compressed air in the screw air compressor 6 contains a certain amount of moisture. Although the dryer 7 removes some of the moisture, some will still remain. To protect the internal components of the pneumatic clutch system 2 and the dry oil injection system 5 from the moisture in the compressed air, it is necessary to periodically drain the dry oil injection air receiver 8 and the pneumatic clutch air receiver 9. This method utilizes automatic drainage to completely solve this problem.

[0055] 3. Pressure sensor 14: There is a very low probability that the screw air compressor 6 will trip or the coupling will be damaged during operation. The purpose of adding pressure sensor 14 is to prevent the above-mentioned faults from occurring without the knowledge of the on-site personnel, which could lead to the ball mill 1 shutting down due to insufficient air supply.

[0056] In summary, the newly developed centralized air supply device for ball mills has proven highly stable in operation, not only resolving existing issues but also achieving significant success in other aspects. Furthermore, it has substantially increased the operating rate of the ball mills, reduced maintenance costs, and brought substantial benefits to the company.

Claims

1. A centralized air supply device for a ball mill, comprising a dry oil injection system and a pneumatic clutch system; characterized in that, It includes a screw air compressor, a dry oil injection air receiver, and a pneumatic clutch air receiver; the screw air compressor supplies air to the dry oil injection air receiver and the pneumatic clutch air receiver respectively; the dry oil injection air receiver supplies air to the dry oil injection system through a dry oil injection air pipe; the pneumatic clutch air receiver supplies air to the pneumatic clutch system through a pneumatic clutch air pipe.

2. The centralized air supply device for a ball mill according to claim 1, characterized in that, It also includes a dryer, and the air supplied by the screw air compressor is supplied to the dry oil injection air receiver and the pneumatic clutch air receiver after passing through the dryer.

3. The centralized air supply device for a ball mill according to claim 1, characterized in that, It also includes air receiver check valves, of which there are two: one air receiver check valve is located between the screw air compressor and the dry oil injection air receiver; the other air receiver check valve is located between the screw air compressor and the pneumatic clutch air receiver.

4. A centralized air supply device for a ball mill according to claim 1, characterized in that, Two screw air compressors are arranged, and the two screw air compressors can supply air to the dry oil injection air receiver and the pneumatic clutch air receiver, respectively.

5. A centralized air supply device for a ball mill according to claim 1, characterized in that, The screw air compressor is equipped with an outlet gate valve and a check valve at its outlet.

6. A centralized air supply device for a ball mill according to claim 1, characterized in that, It also includes pressure sensors, of which there are two, located on the dry oil injection duct and the pneumatic clutch duct respectively.

7. A centralized air supply device for a ball mill according to claim 1, characterized in that, The dry oil injection air bag is equipped with an automatic drain valve.

8. A centralized air supply device for a ball mill according to claim 1, characterized in that, The pneumatic clutch air chamber is equipped with an automatic air chamber drain valve.

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