Ball mill monitoring system

Abstract

The utility model provides a ball mill monitoring system. The ball mill monitoring system comprises a controller, a material granularity detection module, a ventilator valve opening degree detection circuit and a ventilator control module, wherein the output end of the material granularity detection module is connected to the first signal input end of the controller; the ventilator control module comprises a DAC module, a subtraction circuit and a summing circuit which are connected in sequence, the data input end, the clock input end and the latch enabling end of the DAC module are all connected with the multiple first signal output ends of the controller, and the data output end of the DAC module is connected to the first input end of the subtraction circuit; the second input end of the subtraction circuit is connected with the output end of the ventilator valve opening detection circuit, the output end of the subtraction circuit is connected to the first input end of the addition circuit, the second input end of the addition circuit is connected with the first reference voltage, and the output end of the addition circuit is connected to the control end of the ventilator valve. The grinding effect of the ball mill can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of electromechanical equipment technology, and in particular to a ball mill monitoring system. Background Technology

[0002] As a key piece of equipment in the mineral processing process, the ball mill's operating efficiency and product quality have a crucial impact on the company's economic benefits and environmental indicators.

[0003] During ball mill grinding, if the material particles are large, coarse dust particles will be shed in the initial stages of grinding. The presence of these coarse dust particles can negatively impact the grinding process. Firstly, coarse dust particles may form agglomerates within the ball mill, affecting the effective contact between the grinding media (such as steel balls) and other materials. Furthermore, due to their larger particle size, more energy may be required for grinding, resulting in lower efficiency compared to directly grinding materials of suitable particle size. Secondly, the composition of coarse dust particles is complex, potentially containing a significant amount of gangue minerals or incompletely dissociated valuable minerals, affecting the dissociation of valuable minerals and the particle size uniformity of the product. Utility Model Content

[0004] This disclosure provides a ball mill monitoring system to improve the grinding effect of the ball mill.

[0005] This disclosure provides a ball mill monitoring system, including a controller, a material particle size detection module, a fan valve opening detection circuit, and a fan control module.

[0006] The material particle size detection module is configured to detect the particle size of the material, and the output terminal of the material particle size detection module is connected to the first signal input terminal of the controller;

[0007] The ventilation fan control module includes a DAC module, a subtraction circuit, and an addition circuit connected in sequence. The data input terminal, clock input terminal, and latch enable terminal of the DAC module are all connected to multiple first signal output terminals of the controller. The data output terminal of the DAC module is connected to the first input terminal of the subtraction circuit. The second input terminal of the subtraction circuit is connected to the output terminal of the ventilation fan valve opening detection circuit. The output terminal of the subtraction circuit is connected to the first input terminal of the addition circuit. The second input terminal of the addition circuit is connected to a first reference voltage. The output terminal of the addition circuit is connected to the control terminal of the ventilation fan valve.

[0008] In one exemplary embodiment of this disclosure, the ventilator valve opening detection circuit includes resistors R2 and R4 and a filter circuit.

[0009] The first end of the resistor R2 is connected to the current output terminal of the ventilator valve, the second end of the resistor R2 is grounded through the resistor R4, the second end of the resistor R2 is connected to the input terminal of the filter circuit, and the output terminal of the filter circuit is the output terminal of the ventilator valve opening detection circuit.

[0010] In one exemplary embodiment of this disclosure, the ball mill monitoring system further includes a zero-ohm resistor R7, the first end of which is connected to the output terminal of the filter circuit, and the second end of which is the output terminal of the ventilator valve opening detection circuit.

[0011] In one exemplary embodiment of this disclosure, the subtraction circuit includes operational amplifier U4A, resistor R16, resistor R21, and resistor R11.

[0012] The first terminal of resistor R16 is the first input terminal of the subtraction circuit, and the second terminal of resistor R16 is connected to the non-inverting input terminal of operational amplifier U4A. The first terminal of resistor R21 is the second input terminal of the subtraction circuit, and the second terminal of resistor R21 is connected to the inverting input terminal of operational amplifier U4A. The output terminal of operational amplifier U4A is fed back to the inverting input terminal of operational amplifier U4A through resistor R11.

[0013] The output terminal of the operational amplifier U4A is the output terminal of the subtraction circuit.

[0014] In one exemplary embodiment of this disclosure, the adder circuit includes operational amplifier U4B, resistors R12, R13, R14, and R15.

[0015] The first terminal of resistor R15 is the first input terminal of the adder circuit, and the second terminal of resistor R15 is connected to the non-inverting input terminal of operational amplifier U4B. The first terminal of resistor R14 is the first input terminal of the adder circuit, and the second terminal of resistor R14 is connected to the non-inverting input terminal of operational amplifier U4B.

[0016] The inverting input terminal of the operational amplifier U4B is grounded through resistor R13, and the output terminal of the operational amplifier U4B is fed back to the inverting input terminal through resistor R12.

[0017] The output terminal of the operational amplifier U4B is the output terminal of the adder circuit.

[0018] In one exemplary embodiment of this disclosure, the ball mill monitoring system further includes:

[0019] The reference source module is used to provide a second reference voltage to the reference voltage terminal of the DAC module.

[0020] In one exemplary embodiment of this disclosure, the material particle size detection module employs a laser particle size analyzer.

[0021] In one exemplary embodiment of this disclosure, the ball mill monitoring system further includes an abnormal state alarm module, the abnormal state alarm module comprising:

[0022] Vibration detection circuit, used to detect the vibration amplitude of the ball mill;

[0023] Temperature detection circuit, used to detect the operating temperature of the ball mill;

[0024] Current detection circuit is used to detect the operating current of the ball mill;

[0025] The vibration detection circuit, temperature detection circuit, and current detection circuit are respectively connected to multiple second signal input terminals of the controller, and the second signal output terminal of the controller is connected to the alarm circuit.

[0026] The working principle and beneficial effects of the ball mill monitoring system provided in this embodiment are as follows:

[0027] In this embodiment, a material particle size detection module can detect the material particle size in real time and send the data to the controller. During the initial grinding stage, if the detected particle size is larger than a set value, the controller's first signal output terminal outputs a larger valve opening command value. This valve opening command value is a digital signal. By connecting the controller's first signal output terminal to the data input terminal of the DAC module, the DAC module outputs an analog voltage signal to the first input terminal of the subtraction circuit. Simultaneously, the output terminal of the ventilation fan valve opening detection circuit (the actual valve opening value) is connected to the second input terminal of the subtraction circuit, and the subtraction circuit outputs a first difference between the two. The larger the valve opening command value, the larger the first difference, indicating a greater difference between the actual valve opening value and the valve opening command value, requiring a further increase in valve opening. Therefore, the first difference (i.e., the output terminal of the subtraction circuit) can be used as the control signal for the ventilation fan valve, enabling the ventilation fan valve opening to be adjusted according to the valve opening command value.

[0028] Meanwhile, considering that the first difference may be negative, this embodiment of the present disclosure sets an addition circuit at the output terminal of the subtraction circuit to superimpose the output voltage of the subtraction circuit and the first reference voltage, thereby raising the output voltage of the subtraction circuit to above 0V.

[0029] This embodiment of the invention, through the cooperation of a material particle size detection module, a fan valve opening detection circuit, and a fan control module, increases the opening of the fan valve during the initial grinding stage when a larger particle size is detected. This increases the ventilation volume, allowing coarse dust particles generated in the early stages of grinding to be discharged promptly, preventing them from re-mixing within the ball mill and affecting the grinding effect. As grinding progresses and the material particles gradually become finer, the ventilation volume can be appropriately reduced to maintain stable temperature and pressure within the ball mill. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a circuit diagram of the ball mill monitoring system provided in an embodiment of this disclosure;

[0032] Figure 2 This is a schematic diagram of the ventilation fan valve opening detection circuit provided in an embodiment of this disclosure. Detailed Implementation

[0033] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0034] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0035] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:

[0036] Figure 1 This is a circuit diagram of a ball mill monitoring system provided in an embodiment of this disclosure. (Refer to...) Figure 1 The ball mill monitoring system includes a controller, a material particle size detection module, a fan valve opening detection circuit, and a fan control module.

[0037] The material particle size detection module is configured to detect the particle size of the material, and the output of the material particle size detection module is connected to the first signal input of the controller.

[0038] The ventilation fan control module includes a DAC module, a subtraction circuit, and an addition circuit connected in sequence. The data input terminal D, clock input terminal CLK, and latch enable terminal LE of the DAC module are all connected to multiple first signal output terminals of the controller. The data output terminal of the DAC module is connected to the first input terminal of the subtraction circuit. The second input terminal of the subtraction circuit is connected to the output terminal of the ventilation fan valve opening detection circuit. The output terminal of the subtraction circuit is connected to the first input terminal of the addition circuit. The second input terminal of the addition circuit is connected to the first reference voltage. The output terminal of the addition circuit is connected to the control terminal of the ventilation fan valve.

[0039] In this embodiment, a material particle size detection module can detect the material particle size in real time and send the data to the controller. During the initial grinding stage, if the detected particle size is larger than a set value, the controller's first signal output terminal outputs a larger valve opening command value. This valve opening command value is a digital signal. By connecting the controller's first signal output terminal to the data input terminal D of the DAC module, the DAC module outputs an analog voltage signal to the first input terminal of the subtraction circuit. Simultaneously, the output terminal of the ventilation fan valve opening detection circuit (the actual valve opening value) is connected to the second input terminal of the subtraction circuit, and the subtraction circuit outputs the first difference between the two. The larger the valve opening command value, the larger the first difference, indicating a greater difference between the actual valve opening value and the valve opening command value, requiring a further increase in valve opening. Therefore, the first difference (i.e., the output terminal of the subtraction circuit) can be used as the control signal for the ventilation fan valve, enabling the ventilation fan valve opening to be adjusted according to the valve opening command value.

[0040] Meanwhile, considering that the first difference may be negative, this embodiment of the present disclosure sets an addition circuit at the output terminal of the subtraction circuit to superimpose the output voltage of the subtraction circuit and the first reference voltage, thereby raising the output voltage of the subtraction circuit to above 0V.

[0041] This embodiment of the invention, through the cooperation of a material particle size detection module, a fan valve opening detection circuit, and a fan control module, increases the opening of the fan valve during the initial grinding stage when a larger particle size is detected. This increases the ventilation volume, allowing coarse dust particles generated in the early stages of grinding to be discharged promptly, preventing them from re-mixing within the ball mill and affecting the grinding effect. As grinding progresses and the material particles gradually become finer, the ventilation volume can be appropriately reduced to maintain stable temperature and pressure within the ball mill.

[0042] Reference Figure 2 In one exemplary embodiment of this disclosure, the ventilation fan valve opening detection circuit includes resistors R2 and R4 and a filter circuit.

[0043] The first end of resistor R2 is connected to the current output terminal of the ventilator valve, the second end of resistor R2 is grounded through resistor R4, the second end of resistor R2 is connected to the input terminal of the filter circuit, and the output terminal of the filter circuit is the output terminal of the ventilator valve opening detection circuit.

[0044] In this embodiment, the ventilation fan valve is an electrically adjustable valve. The control circuit inside the electrically adjustable valve converts the valve opening information into a 4-20mA current signal for output. The aforementioned feedback current signal is proportional to the valve opening; for example, a 4mA current is fed back when the valve is fully closed, a 20mA current is fed back when the valve is fully open, and intermediate openings correspond to a corresponding linear current value.

[0045] Resistors R2 and R4 form a series circuit. The current signal output from the current output terminal of the ventilation fan valve flows through resistors R2 and R4, forming a voltage signal across resistor R4. This voltage signal, after being filtered by a filter circuit to remove high-frequency interference signals, serves as the output signal of the ventilation fan valve opening detection circuit and is connected to the second input terminal of the subtraction circuit. The filter circuit includes a second-order low-pass filter circuit consisting of resistor R5 and capacitor C8, and resistor R6 and capacitor C9.

[0046] As can be seen from the above, this embodiment achieves the conversion of current-to-voltage signals based on resistors R2 and R4, and the circuit structure is simple and easy to implement.

[0047] Reference Figure 2 In one exemplary embodiment of this disclosure, the ball mill monitoring system further includes a zero-ohm resistor R7, the first end of which is connected to the output of the filter circuit, and the second end of which is the output of the ventilator valve opening detection circuit.

[0048] In this embodiment, a zero-ohm resistor R7 is set at the output of the filter circuit, which will impede the current to a certain extent, thereby avoiding excessive circulating current.

[0049] In one exemplary embodiment of this disclosure, the subtraction circuit includes operational amplifier U4A, resistor R16, resistor R21, and resistor R11.

[0050] The first terminal of resistor R16 is the first input terminal of the subtraction circuit, and the second terminal of resistor R16 is connected to the non-inverting input terminal of operational amplifier U4A. The first terminal of resistor R21 is the second input terminal of the subtraction circuit, and the second terminal of resistor R21 is connected to the inverting input terminal of operational amplifier U4A. The output terminal of operational amplifier U4A is fed back to the inverting input terminal of operational amplifier U4A through resistor R11.

[0051] The output of op-amp U4A is the output of the subtraction circuit.

[0052] In this embodiment, the operational amplifier U4A, resistors R16, R21, and R11 constitute a subtraction circuit. According to actual needs, the amplification factor of the subtraction circuit can be adjusted by adjusting the resistance values ​​of resistors R21 and R11, thereby adjusting the output voltage level of the subtraction circuit.

[0053] In one exemplary embodiment of this disclosure, the adder circuit includes operational amplifier U4B, resistors R12, R13, R14, and R15.

[0054] The first terminal of resistor R15 is the first input terminal of the adder circuit, and the second terminal of resistor R15 is connected to the non-inverting input terminal of operational amplifier U4B. The first terminal of resistor R14 is also the first input terminal of the adder circuit, and the second terminal of resistor R14 is connected to the non-inverting input terminal of operational amplifier U4B.

[0055] The inverting input of op-amp U4B is grounded through resistor R13, and the output of op-amp U4B is fed back to the inverting input through resistor R12.

[0056] The output of op-amp U4B is the output of the adder circuit.

[0057] In this embodiment, the operational amplifier U4B, resistors R12, R13, R14, and R15 constitute an adder circuit. According to actual needs, the amplification factor of the adder circuit can be adjusted by adjusting the resistance values ​​of resistors R12 and R13, thereby adjusting the output voltage level of the adder circuit.

[0058] In one exemplary embodiment of this disclosure, the ball mill monitoring system further includes:

[0059] The reference source module is used to provide a second reference voltage to the reference voltage terminal of the DAC module.

[0060] In this embodiment, the reference source module U2 provides a stable reference voltage for the DAC module U1, which is beneficial to the reliable operation of the DAC module U1.

[0061] In one exemplary embodiment of this disclosure, the material particle size detection module employs a laser particle size analyzer.

[0062] In this embodiment, the material particle size detection module is implemented using a laser particle size analyzer. The laser particle size analyzer works based on the principle of light scattering. When a laser beam irradiates a particle sample, the particles scatter the laser light. Small particles mainly produce Rayleigh scattering, and the intensity of the scattered light is relatively uniform in all directions; while the scattered light from large particles is mainly concentrated in a small angular range in front. By measuring the intensity of the scattered light at different angles, the laser particle size analyzer can obtain the particle size distribution.

[0063] Laser particle size analyzers not only provide accurate measurement results, but also enable rapid detection of material particle size.

[0064] In one exemplary embodiment of this disclosure, the ball mill monitoring system further includes an abnormal state alarm module, which includes:

[0065] Vibration detection circuit, used to detect the vibration amplitude of the ball mill;

[0066] Temperature detection circuit, used to detect the operating temperature of the ball mill;

[0067] Current detection circuit is used to detect the operating current of the ball mill;

[0068] The vibration detection circuit, temperature detection circuit, and current detection circuit are respectively connected to multiple second signal input terminals of the controller, and the second signal output terminal of the controller is connected to the alarm circuit.

[0069] In this embodiment, by installing vibration sensors in parts such as the ball mill cylinder and bearings to form a vibration detection circuit, the vibration generated by the ball mill during operation can be accurately captured; by installing temperature sensors in key parts of the ball mill (such as the motor, bearings, and grinding cylinder) to form a temperature detection circuit, the working temperature of the ball mill can be detected in real time; and by setting a current detection circuit, the working current of the ball mill can be monitored.

[0070] The output signals of the vibration detection circuit, temperature detection circuit, and current detection circuit are respectively connected to multiple second signal input terminals of the controller. The controller can monitor the working status of the ball mill in real time. If an abnormality is detected, the alarm circuit will be triggered immediately.

[0071] As can be seen from the above, this embodiment can promptly detect and issue alarms when abnormalities such as vibration, excessive temperature, or unstable current occur by real-time monitoring of the key operating parameters of the ball mill, thus reminding staff to carry out timely maintenance.

[0072] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A ball mill monitoring system, characterized by, The controller, the material particle size detection module, the ventilator valve opening degree detection circuit and the ventilator control module, The material particle size detection module is configured to detect the material particle size, and an output end of the material particle size detection module is connected to a first signal input end of the controller; The ventilator control module comprises a DAC module, a subtraction circuit and an addition circuit connected in sequence, a data input end, a clock input end and a latch enable end of the DAC module are connected to a plurality of first signal output ends of the controller, a data output end of the DAC module is connected to a first input end of the subtraction circuit, a second input end of the subtraction circuit is connected to an output end of the ventilator valve opening degree detection circuit, an output end of the subtraction circuit is connected to a first input end of the addition circuit, a second input end of the addition circuit is connected to a first reference voltage, and an output end of the addition circuit is connected to a control end of the ventilator valve.

2. The ball mill monitoring system of claim 1, wherein, The ventilator valve opening degree detection circuit comprises a resistor R2, a resistor R4 and a filter circuit, a first end of the resistor R2 is connected to a current output end of the ventilator valve, a second end of the resistor R2 is grounded through the resistor R4, the second end of the resistor R2 is connected to an input end of the filter circuit, and an output end of the filter circuit is an output end of the ventilator valve opening degree detection circuit.

3. The ball mill monitoring system of claim 2, wherein, Further comprising a zero-ohm resistor R7, a first end of the zero-ohm resistor R7 is connected to an output end of the filter circuit, and a second end of the zero-ohm resistor R7 is an output end of the ventilator valve opening degree detection circuit.

4. The ball mill monitoring system of claim 1, wherein, The subtraction circuit comprises an operational amplifier U4A, a resistor R16, a resistor R21 and a resistor R11, a first end of the resistor R16 is a first input end of the subtraction circuit, a second end of the resistor R16 is connected to a non-inverting input end of the operational amplifier U4A, a first end of the resistor R21 is a second input end of the subtraction circuit, a second end of the resistor R21 is connected to an inverting input end of the operational amplifier U4A, an output end of the operational amplifier U4A is feedback-connected to the inverting input end of the operational amplifier U4A through the resistor R11, and the output end of the operational amplifier U4A is an output end of the subtraction circuit.

5. The ball mill monitoring system of claim 1, wherein, The addition circuit comprises an operational amplifier U4B, a resistor R12, a resistor R13, a resistor R14 and a resistor R15, a first end of the resistor R15 is a first input end of the addition circuit, a second end of the resistor R15 is connected to a non-inverting input end of the operational amplifier U4B, a first end of the resistor R14 is a first input end of the addition circuit, and a second end of the resistor R14 is connected to the non-inverting input end of the operational amplifier U4B, an inverting input end of the operational amplifier U4B is grounded through the resistor R13, an output end of the operational amplifier U4B is feedback-connected to the inverting input end of the operational amplifier U4B through the resistor R12, and the output end of the operational amplifier U4B is an output end of the addition circuit.

6. The ball mill monitoring system of claim 1, wherein, Further comprising: a reference source module configured to provide a second reference voltage for a reference voltage end of the DAC module.

7. The ball mill monitoring system of claim 1, wherein, The material particle size detection module adopts a laser particle size detector.

8. The ball mill monitoring system of claim 1, wherein, Further comprising an abnormal state alarm module, the abnormal state alarm module comprises: A vibration detection circuit is arranged to detect the vibration amplitude of the ball mill; A temperature detection circuit is arranged to detect the working temperature of the ball mill; A current detection circuit is arranged to detect the working current of the ball mill; The vibration detection circuit, the temperature detection circuit and the current detection circuit are respectively connected to a plurality of second signal input ends of a controller, and a second signal output end of the controller is connected to an alarm circuit.

Images