Double-pipeline centralized gas supply system of ball mill

Abstract

The utility model discloses a double-pipeline centralized gas supply system of a ball mill. The system consists of at least one ball mill unit, a gas source system unit, a main pipeline unit, a branch pipeline unit and a PLC (Programmable Logic Controller), the air source system unit supplies air to a pneumatic clutch and a gear lubricating device in the ball mill unit; the system comprises a first air compressor, a second air compressor and a third air compressor, the first air compressor is connected with a first air storage tank through a first air source pipeline, the first air source pipeline is connected with a first pressure transmitter and a first electric ball valve, and the second air compressor is connected with a second air storage tank through a second air source pipeline. A second air source pipeline is connected with a second pressure transmitter and a second electric ball valve, and a third air compressor is connected with a third pressure transmitter; and the PLC is connected with each electric control component in the gas source system unit and the branch pipeline unit through cables. The utility model has the advantages of compact arrangement of connecting pipelines, high air supply efficiency, obvious energy-saving effect and good pressure stabilizing effect, and can ensure the efficient and stable operation of the ball mill.

Description

Technical Field

[0001] This utility model relates to the field of grinding and beneficiation gas supply technology, specifically a dual-pipeline centralized gas supply system for ball mills. Background Technology

[0002] Ball mills are the most widely used grinding equipment, primarily used to grind crushed minerals to the particle size required for beneficiation operations. Pneumatic clutches and gear lubrication devices are two important transmission components ensuring the normal operation of the ball mill. They mainly function to inflate and vent the air chamber and lubricate the gears. Both require a reliable air supply with sufficient pressure and stable flow.

[0003] Traditional ball mill air supply systems often consist of independent piston-type air pumps and small air storage tanks. During operation, these systems suffer from problems such as unstable air pressure and flow, high equipment failure rates, and lack of backup air sources. Specifically:

[0004] (1) High energy consumption: The piston air pump operates at a fixed speed and full load continuously, and cannot dynamically adjust the speed according to the load, resulting in serious waste of electrical energy;

[0005] (2) Large pressure fluctuations and poor pressure regulation performance: The inlet pressure of the ball mill is significantly affected by changes in operating conditions, requiring manual intervention for adjustment, resulting in poor stability;

[0006] (3) High equipment failure rate: The working performance of the air pump is unstable and it is not equipped with a backup air source. Once a failure occurs and the air supply stops, it will seriously affect the normal operation of the ball mill, or even cause the ball mill of this series to stop, which will have a significant impact on grinding and beneficiation production.

[0007] (4) Poor system pressure regulation: When the system pressure cannot be guaranteed, there is no backup gas source available.

[0008] Chinese patent CN207086035U discloses a ball mill air supply system, which adds an air compressor as the main air source to supply air to the clutch based on the original air pump. When the pressure of the main air source is insufficient, the backup air source (air pump) is activated. The system is simple to configure and can solve the problem of supplementing the air source when the air pressure is lower than the minimum set value to a certain extent. However, it still has problems such as a single air supply target, low pressure stabilization efficiency, and poor energy saving effect. Utility Model Content

[0009] The purpose of this invention is to provide a dual-pipeline centralized air supply system for ball mills to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a ball mill dual-pipeline centralized gas supply system, comprising at least one ball mill unit, a gas source system unit, a main pipeline unit, a branch pipeline unit, and a PLC controller;

[0011] The ball mill unit includes a ball mill drum, a synchronous motor, a pneumatic clutch, and a gear lubrication device; the pneumatic clutch is used to connect or disconnect the synchronous motor from the ball mill drum under stable air power; the gear lubrication device is used to spray lubricating oil onto the surface of the meshing gears;

[0012] The air source system unit includes a first air compressor and a second air compressor. The first air compressor is connected to a first air storage tank via a first air source pipeline. A first pressure transmitter and a first electric ball valve are sequentially connected to the first air source pipeline, and a first check valve is connected to the inlet of the first air storage tank. The second air compressor is connected to a second air storage tank via a second air source pipeline. A second pressure transmitter and a second electric ball valve are sequentially connected to the second air source pipeline, and a second check valve is connected to the inlet of the second air storage tank. The air source system unit also includes a third air compressor, and the exhaust port of the third air compressor is connected to a third pressure transmitter.

[0013] The gas source system unit is connected to the main pipeline unit and the branch pipeline unit. The exhaust port of the first gas storage tank is connected to the first gas supply main pipe, and the pneumatic clutch is connected to the first gas supply main pipe through the first gas supply branch pipe. The exhaust port of the second gas storage tank is connected to the second gas supply main pipe, and the gear lubrication device is connected to the second gas supply main pipe through the second gas supply branch pipe.

[0014] The PLC controller is connected to the various electrical control components in the gas source system unit and the branch pipeline unit via cables.

[0015] Preferably, the pneumatic clutch requires an air source pressure of 0.7 to 1.0 MPa, and the gear lubrication device requires an air source pressure of 0.5 to 0.8 MPa.

[0016] Preferably, the first air compressor is equipped with a first air compressor controller, the loading pressure of which is set to 0.7 MPa and the unloading pressure to 1.0 MPa; the second air compressor is equipped with a second air compressor controller, the loading pressure of which is set to 0.5 MPa and the unloading pressure to 0.8 MPa; the first and second air compressors are the main air compressors and are permanent magnet variable frequency screw air compressors; the third air compressor is equipped with a third air compressor controller, the loading pressure of which is set to 0.7 MPa and the unloading pressure to 1.0 MPa; the third air compressor is the auxiliary air compressor and is an industrial frequency screw air compressor.

[0017] Preferably, the third air compressor is connected in parallel with the first and second air compressors. The third air compressor is connected to the first air source pipeline through a third air source pipeline and to the second air source pipeline through a fourth air source pipeline. A first electric V-shaped ball valve is connected to the third air source pipeline and a second electric V-shaped ball valve is connected to the fourth air source pipeline.

[0018] Preferably, a pressure reducing valve is connected to the front end of the air inlet of the second gas tank, and a pressure relief valve is connected to the rear end of the exhaust port. The pressure relief valve is connected in parallel to the second gas supply main pipe.

[0019] Preferably, the first gas supply branch pipe is connected to a first electric shut-off valve and a fourth pressure transmitter, and the second gas supply branch pipe is connected to a second electric shut-off valve and a fifth pressure transmitter.

[0020] Preferably, the electrical control components include a first air compressor controller, a first pressure transmitter, a first electric ball valve, a second air compressor controller, a second pressure transmitter, a second electric ball valve, a third air compressor controller, a third pressure transmitter, a first electric V-type ball valve, a second electric V-type ball valve, a first electric shut-off valve, a fourth pressure transmitter, a second electric shut-off valve, and a fifth pressure transmitter, wherein the electric V-type ball valve and the pressure transmitter use 4-20mA analog signals, and the rest use digital signals.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. This ball mill dual-pipeline centralized air supply system constructs a redundant air source system through two main air compressors and one auxiliary air compressor, which can ensure uninterrupted air supply and guarantee stable and reliable air supply to the ball mill's pneumatic clutch and gear lubrication device. Moreover, through pressure deviation rate-based control distribution, the pressure stabilization effect is good.

[0023] 2. The ball mill's dual-pipeline centralized air supply system, with its flexible adjustment of the variable frequency main air compressor and intelligent start-stop of the auxiliary air compressor, can greatly reduce ineffective operating time and achieve significant energy savings. Moreover, the stable air source and pressure ensure uniform material flow within the ball mill, extending the replacement cycle of easily worn and consumable parts such as liners and steel balls, reducing the impact on the transmission system caused by unstable air pressure, and thus significantly reducing the equipment failure rate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the ball mill dual-pipeline centralized air supply system of this utility model;

[0025] Figure 2 This is a schematic diagram of the PLC control connection in the gas supply system of this utility model.

[0026] In the diagram: 101, ball mill drum; 102, synchronous motor; 103, pneumatic clutch; 104, gear lubrication device; 201, first air compressor; 202, first air compressor controller; 203, first pressure transmitter; 204, first electric ball valve; 205, first air source pipeline; 206, first check valve; 207, first air storage tank; 208, second air compressor; 209, second air compressor controller; 210, second pressure transmitter; 211, second electric ball valve; 212, second air source pipeline; 213, pressure reducing valve; 214, second check valve; 215, ... 2. Air storage tank; 216. Pressure relief valve; 217. Third air compressor; 218. Third air compressor controller; 219. Third pressure transmitter; 220. Third air source pipeline; 221. First electric V-ball valve; 222. Fourth air source pipeline; 223. Second electric V-ball valve; 301. First main air supply pipe; 302. Second main air supply pipe; 401. First branch air supply pipe; 402. First electric shut-off valve; 403. Fourth pressure transmitter; 404. Second branch air supply pipe; 405. Second electric shut-off valve; 406. Fifth pressure transmitter; 501. PLC controller. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-2 The ball mill dual-pipeline centralized gas supply system provided in this embodiment consists of at least one ball mill unit, a gas source system unit, a main pipeline unit, a branch pipeline unit, and a PLC controller 501.

[0029] The ball mill unit includes a ball mill drum 101, a synchronous motor 102, a pneumatic clutch 103, and a gear lubrication device 104. Under stable and suitable air source power, the pneumatic clutch 103 inflates or deflates the air tire to connect or disconnect the synchronous motor 102 from the ball mill drum 101. The pneumatic clutch 103 requires an air source pressure of 0.7 to 1.0 MPa. The gear lubrication device 104 is used to spray lubricating oil onto the surface of the meshing gears. The gear lubrication device 104 requires an air source pressure of 0.5 to 0.8 MPa.

[0030] The air supply system unit includes a first air compressor 201 and a second air compressor 208. Both air compressors are main air compressors, employing permanent magnet variable frequency screw compressors. The first air compressor 201 primarily provides air to the pneumatic clutch 103, with its controller 202 setting the loading pressure to 0.7 MPa and the unloading pressure to 1.0 MPa. The second air compressor 208 primarily provides air to the gear lubrication device 104, with its controller 209 setting the loading pressure to 0.5 MPa and the unloading pressure to 0.8 MPa. The first air compressor 201 is connected to a first air storage tank 207 via a first air supply pipeline 205. A first pressure transmitter 203 and a first electric ball valve 204 are sequentially connected to the first air supply pipeline 205 at the exhaust end of the first air compressor 201. A first check valve 206 is connected to the first air supply pipeline 205 at the inlet end of the first air storage tank 207. The second air compressor 208 is connected to the second air tank 215 via the second air source pipeline 212. A second pressure transmitter 210 and a second electric ball valve 211 are sequentially connected to the second air source pipeline 212 at the exhaust end of the second air compressor 208. A second check valve 214 is connected to the second air source pipeline 212 at the air inlet of the second air tank 215. A pressure reducing valve 213 is connected to the front end of the air inlet of the second air tank 215. The outlet pressure setting of the pressure reducing valve 213 is 0.8 MPa to prevent the air supply pressure from exceeding 0.8 MPa when the third air compressor 217 provides auxiliary air supply. Its installation position is located at the front end of the air inlet of the second check valve 214. A pressure relief valve 216 is connected to the rear end of the exhaust port. The pressure relief valve 216 is connected in parallel to the second main air supply pipe 302. The pressure relief setting of the pressure relief valve 216 is 0.8 MPa, forming a double protection with the pressure reducing valve 213.

[0031] The air source system unit in this embodiment also includes a third air compressor 217, which is an auxiliary air compressor and adopts a power frequency screw air compressor; the exhaust port of the third air compressor 217 is connected to the third pressure transmitter 219; the loading pressure of the third air compressor controller 218 is set to 0.7MPa and the unloading pressure is set to 1.0MPa, which is consistent with the pneumatic clutch 103 with higher air pressure. The third air compressor 217 is connected in parallel with the first air compressor 201 and the second air compressor 208. The third air compressor 217 is connected to the rear end of the exhaust port of the first electric ball valve 204 on the first air source pipeline 205 through the third air source pipeline 220, and at the same time, it is connected to the rear end of the exhaust port of the second electric ball valve 211 on the second air source pipeline 212 through the fourth air source pipeline 222. The third electric V-shaped ball valve 221 is connected to the third air source pipeline 220, and the fourth electric V-shaped ball valve 223 is connected to the fourth air source pipeline 222. The valve core design of the electric V-shaped ball valve provides a near-linear flow characteristic, taking into account both on / off and regulation functions. The linear regulation function enables the auxiliary air source to smoothly enter the main air source network, avoiding pressure fluctuations.

[0032] In the above embodiment, the first electric V-type ball valve 221 and the second electric V-type ball valve 223 adopt a staged opening method. When the pneumatic clutch 103 needs auxiliary air supply, the pressure difference between the third pressure transmitter 219 and the first pressure transmitter 203 is compared in real time. When ΔP < 0.05MPa, the first electric V-type ball valve 221 is opened. When the gear lubrication device 104 needs auxiliary air supply, the pressure difference between the third pressure transmitter 219 and the second pressure transmitter 210 is compared in real time. When ΔP < 0.05MPa, the second electric V-type ball valve 223 is opened. The purpose of controlling the pressure difference is to ensure that the compressed air from the auxiliary pipeline network is smoothly integrated into the main pipeline network. The opening method of the first electric V-type ball valve 221 and the second electric V-type ball valve 223 is as follows: the valve is opened to 20% opening degree in the first 1 second, and then linearly opened to 100% opening degree in the following 2 seconds.

[0033] In this embodiment, the gas source system unit is connected to the main pipeline unit and the branch pipeline unit, with the number of branch pipeline units determined by the number of ball mill units. In the gas source system unit, the exhaust port of the first gas storage tank 207 is connected to the first main gas supply pipe 301, and the pneumatic clutch 103 is connected to the first main gas supply pipe 301 via the first branch gas supply pipe 401. The first branch gas supply pipe 401 is sequentially connected to the first electric shut-off valve 402 and the fourth pressure transmitter 403. In the gas source system unit, the exhaust port of the second gas storage tank 215 is connected to the second main gas supply pipe 302, and the gear lubrication device 104 is connected to the second main gas supply pipe 302 via the second branch gas supply pipe 404. The second branch gas supply pipe 404 is sequentially connected to the second electric shut-off valve 405 and the fifth pressure transmitter 406.

[0034] In this embodiment, the PLC controller 501 is connected via cables to the first air compressor controller 202, the first pressure transmitter 203, the first electric ball valve 204, the second air compressor controller 209, the second pressure transmitter 210, the second electric ball valve 211, the third air compressor controller 218, the third pressure transmitter 219, the first electric V-type ball valve 221, the second electric V-type ball valve 223, the first electric shut-off valve 402, the fourth pressure transmitter 403, the second electric shut-off valve 405, and the fifth pressure transmitter 406. The electric V-type ball valve and the pressure transmitter use 4-20mA analog signal input terminals, while the others use digital signal input terminals.

[0035] In actual operation, the PLC controller 501 collects pressure data from the fourth pressure transmitter 403 and the fifth pressure transmitter 406 in real time, and calculates the pressure drop rate ΔP / Δt of the first air supply branch pipe 401 and the second air supply branch pipe 404 respectively; based on the ΔP / Δt data, pressure stabilization control is performed on the first air supply branch pipe 401 and the second air supply branch pipe 404 respectively, as follows:

[0036] (1) When |ΔP / Δt|<0.01MPa / s, the first electric shut-off valve 402 and the second electric shut-off valve 405 are the main control, and the first air compressor 201 and the second air compressor 208 are the auxiliary control by frequency conversion speed regulation.

[0037] (2) When 0.01MPa / s≤|ΔP / Δt|<0.03MPa / s, the first air compressor 201 and the second air compressor 208 are controlled by frequency conversion speed regulation, and the first electric shut-off valve 402 and the second electric shut-off valve 405 are controlled by frequency conversion speed regulation.

[0038] (3) When |ΔP / Δt|≥0.03MPa / s, or the pressure data of the fourth pressure transmitter 403 <0.7MPa and the pressure data of the fifth pressure transmitter 406 <0.5MPa, start the third air compressor 217, the first electric V-type ball valve 221 and the second electric V-type ball valve 223 to provide compensation air supply.

[0039] (4) When the pressure data of the fourth pressure transmitter 403 reaches 1.0MPa and the pressure data of the fifth pressure transmitter 406 reaches 0.8MPa, the third air compressor 217 stops supplying air and closes the first electric V-type ball valve 221 and the second electric V-type ball valve 223.

[0040] Specifically, when the pneumatic clutch 103 needs to assist in the air supply to start the third air compressor 217, the pressure difference between the third pressure transmitter 219 and the first pressure transmitter 203 is compared in real time. When ΔP < 0.05 MPa, the first electric V-type ball valve 221 is opened. When the gear lubrication device 104 needs to assist in the air supply to start the third air compressor 217, the pressure difference between the third pressure transmitter 219 and the second pressure transmitter 210 is compared in real time. When ΔP < 0.05 MPa, the second electric V-type ball valve 223 is opened.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual line centralized air supply system for a ball mill, characterized by: It consists of at least one ball mill unit, an air supply system unit, a main pipeline unit, a branch pipeline unit, and a PLC controller (501); The ball mill unit includes a ball mill drum (101), a synchronous motor (102), a pneumatic clutch (103), and a gear lubrication device (104); the pneumatic clutch (103) is used to connect or disconnect the synchronous motor (102) from the ball mill drum (101) under stable air power; the gear lubrication device (104) is used to spray lubricating oil onto the surface of the meshing gears; The air source system unit includes a first air compressor (201) and a second air compressor (208). The first air compressor (201) is connected to a first air storage tank (207) through a first air source pipeline (205). A first pressure transmitter (203) and a first electric ball valve (204) are connected sequentially to the first air source pipeline (205). A first check valve (206) is connected to the inlet of the first air storage tank (207). The second air compressor (208) is connected to a second air storage tank (215) through a second air source pipeline (212). A second pressure transmitter (210) and a second electric ball valve (211) are connected sequentially to the second air source pipeline (212). A second check valve (214) is connected to the inlet of the second air storage tank (215). The air source system unit also includes a third air compressor (217). The exhaust port of the third air compressor (217) is connected to a third pressure transmitter (219). The gas source system unit is connected to the main pipeline unit and the branch pipeline unit. The exhaust port of the first gas storage tank (207) is connected to the first gas supply main pipe (301), and the pneumatic clutch (103) is connected to the first gas supply main pipe (301) through the first gas supply branch pipe (401). The exhaust port of the second gas storage tank (215) is connected to the second gas supply main pipe (302), and the gear lubrication device (104) is connected to the second gas supply main pipe (302) through the second gas supply branch pipe (404). The PLC controller (501) is connected to the various electrical control components in the gas source system unit and the branch pipeline unit via cables.

2. The ball mill dual-pipeline centralized gas supply system according to claim 1, characterized in that: The pneumatic clutch (103) requires an air source pressure of 0.7 to 1.0 MPa, and the gear lubrication device (104) requires an air source pressure of 0.5 to 0.8 MPa.

3. The ball mill dual-pipeline centralized air supply system according to claim 1, characterized in that: The first air compressor (201) is equipped with a first air compressor controller (202), the loading pressure of the first air compressor controller (202) is set to 0.7MPa and the unloading pressure is set to 1.0MPa. The second air compressor (208) is equipped with a second air compressor controller (209), the loading pressure of the second air compressor controller (209) is set to 0.5MPa and the unloading pressure is set to 0.8MPa. The first air compressor (201) and the second air compressor (208) are the main air compressors and adopt permanent magnet variable frequency screw air compressors. The third air compressor (217) is equipped with a third air compressor controller (218), the loading pressure of the third air compressor controller (218) is set to 0.7MPa and the unloading pressure is set to 1.0MPa. The third air compressor (217) is the auxiliary air compressor and adopts an industrial frequency screw air compressor.

4. The ball mill dual-pipeline centralized air supply system according to claim 1, characterized in that: The third air compressor (217) is connected in parallel with the first air compressor (201) and the second air compressor (208). The third air compressor (217) is connected to the first air source pipeline (205) through the third air source pipeline (220) and to the second air source pipeline (212) through the fourth air source pipeline (222). A first electric V-type ball valve (221) is connected to the third air source pipeline (220) and a second electric V-type ball valve (223) is connected to the fourth air source pipeline (222).

5. A ball mill dual-pipeline centralized air supply system according to claim 1, characterized in that: The second gas storage tank (215) has a pressure reducing valve (213) connected to the front end of the air inlet and a pressure relief valve (216) connected to the rear end of the exhaust port. The pressure relief valve (216) is connected in parallel to the second gas supply main pipe (302).

6. The ball mill dual-pipeline centralized air supply system according to claim 1, characterized in that: The first gas supply branch pipe (401) is connected to the first electric shut-off valve (402) and the fourth pressure transmitter (403), and the second gas supply branch pipe (404) is connected to the second electric shut-off valve (405) and the fifth pressure transmitter (406).

7. A ball mill dual-pipeline centralized air supply system according to claim 1, characterized in that: The electrical control components include a first air compressor controller (202), a first pressure transmitter (203), a first electric ball valve (204), a second air compressor controller (209), a second pressure transmitter (210), a second electric ball valve (211), a third air compressor controller (218), a third pressure transmitter (219), a first electric V-type ball valve (221), a second electric V-type ball valve (223), a first electric shut-off valve (402), a fourth pressure transmitter (403), a second electric shut-off valve (405), and a fifth pressure transmitter (406). Among these, the electric V-type ball valve and the pressure transmitter use 4-20mA analog signals, while the others use digital signals.

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