Vibrating screen on-line monitoring system

Abstract

The utility model provides a vibrating screen online monitoring system, and belongs to the technical field of vibrating screens. The vibrating screen on-line monitoring system comprises a vibration monitoring module, a frequency-voltage conversion module, a comparison module, a vibration alarm module and a protection module. The vibration monitoring module is configured to monitor the vibration state of the vibration screen, the output end of the vibration monitoring module is connected with the input end of the frequency-voltage conversion module, the output end of the frequency-voltage conversion module is connected with the input end of the comparison module, and the output end of the comparison module is connected with the control end of the vibration alarm module; the control end of the protection module is connected with the output end of the comparison module, the first end of the protection module is connected with a power supply, and the second end of the protection module is connected with the power supply end of the vibrating screen. Efficient and stable operation of the vibrating screen can be guaranteed.

Description

Technical Field

[0001] This application relates to the field of vibrating screen technology, and in particular to an online monitoring system for vibrating screens. Background Technology

[0002] In industrial production, vibrating screens, as key equipment for material screening, are widely used in many industries such as mining, metallurgy, and chemicals. Traditionally, the lack of effective online monitoring methods makes it impossible to detect abnormal changes in vibration during vibrating screen operation. When a vibrating screen malfunctions, it often leads to poor material screening efficiency, severely impacting production efficiency and potentially causing serious equipment damage and significant economic losses. Furthermore, relying on manual periodic inspections to identify problems is not only inefficient but also has a significant time lag, failing to guarantee the efficient and stable operation of the vibrating screen. Utility Model Content

[0003] This application provides an online monitoring system for vibrating screens to ensure their efficient and stable operation.

[0004] This application provides an online monitoring system for a vibrating screen, including: a vibration monitoring module, a frequency-to-voltage conversion module, a comparison module, a vibration alarm module, and a protection module;

[0005] The vibration monitoring module is configured to monitor the vibration state of the vibrating screen. The output terminal of the vibration monitoring module is connected to the input terminal of the frequency-voltage conversion module. The output terminal of the frequency-voltage conversion module is connected to the input terminal of the comparison module. The output terminal of the comparison module is connected to the control terminal of the vibration alarm module.

[0006] The control terminal of the protection module is connected to the output terminal of the comparison module, the first terminal of the protection module is connected to the power supply, and the second terminal of the protection module is connected to the power supply terminal of the vibrating screen.

[0007] In one exemplary embodiment of this application, the vibration monitoring module includes: a rheostat RP1, an electromagnetic coil L1, a magnetic block U5, a switching transistor Q1, and a resistor R1;

[0008] The magnetic block U5 is fixedly mounted on the screen of the vibrating screen. The first end of the rheostat RP1 is connected to the VCC power supply, the second end of the rheostat RP1 is grounded, the sliding end of the rheostat RP1 is connected to the control end of the switching transistor Q1, the first end of the switching transistor Q1 is connected to the VCC power supply through the resistor R1, the second end of the switching transistor Q1 is grounded, and the first end of the switching transistor Q1 is connected to the input end of the frequency-voltage conversion module.

[0009] In one exemplary embodiment of this application, the vibration monitoring module further includes: capacitor C2, transistor Q2, resistor R10, resistor R13 and resistor R4;

[0010] The first end of capacitor C2 is connected to the first end of switching transistor Q1, the second end of capacitor C2 is connected to the base of transistor Q2, the second end of capacitor C2 is connected to the collector of transistor Q2 through resistor R13, the collector of transistor Q2 is connected to VCC power supply through resistor R10, the emitter of transistor Q2 is grounded through resistor R4, and the emitter of transistor Q2 is connected to the input terminal of the frequency-to-voltage conversion module.

[0011] In one exemplary embodiment of this application, resistor R2, rheostat RP2, and resistor R3 are used instead of resistors R10 and R13;

[0012] The first end of resistor R2 is connected to VCC power supply, the second end of resistor R2 is connected to the first end of resistor R3 through the variable resistor RP2, the sliding end of the variable resistor RP2 is connected to the base of transistor Q2, and the collector of transistor Q2 is connected to VCC power supply.

[0013] In one exemplary embodiment of this application, the frequency-to-voltage conversion module includes: diode D1, resistor R5, resistor R8, transistor Q3, resistor R7, capacitor C4, operational amplifier U1, and resistor R6;

[0014] The cathode of diode D1 is connected to the output terminal of the vibration monitoring module, the anode of diode D1 is grounded through resistor R5, the anode of diode D1 is connected to the control terminal of transistor Q3, the first terminal of transistor Q3 is connected to VCC power supply through resistor R8, the second terminal of transistor Q3 is connected to the inverting input terminal of operational amplifier U1, the non-inverting input terminal of operational amplifier U1 is grounded through resistor R6, the output terminal of operational amplifier U1 is connected to the inverting input terminal of operational amplifier U1 through capacitor C4, the output terminal of operational amplifier U1 is connected to the first terminal of transistor Q3 through resistor R7, and the output terminal of operational amplifier U1 is connected to the input terminal of the comparator module.

[0015] In one exemplary embodiment of this application, the comparison module includes: operational amplifier U2, operational amplifier U3, and OR gate U4;

[0016] The non-inverting input of the operational amplifier U2 is connected to the output of the frequency-to-voltage conversion module, the inverting input of the operational amplifier U2 is used to connect to the reference voltage V1, and the output of the operational amplifier U2 is connected to the first input of the OR gate U4.

[0017] The non-inverting input of the operational amplifier U3 is connected to the reference voltage V2, the inverting input of the operational amplifier U3 is connected to the output of the frequency-to-voltage conversion module, the output of the operational amplifier U3 is connected to the second input of the OR gate U4, and the output of the OR gate U4 is connected to the control terminal of the alarm module.

[0018] In one exemplary embodiment of this application, the alarm module includes: a resistor R9, a transistor Q4, and a light-emitting diode LED1;

[0019] The first end of the resistor R9 is connected to the output terminal of the comparator module, the second end of the resistor R9 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the VCC power supply, the emitter of the transistor Q4 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is grounded.

[0020] The beneficial effects of the online monitoring system for vibrating screens provided in this application embodiment are as follows: The vibration monitoring module senses the vibration state of the vibrating screen in real time based on the principle of electromagnetic induction, without missing any abnormal signs. The frequency-voltage conversion module cleverly converts pulse signals into voltage signals, laying the foundation for subsequent accurate judgment. The comparison module strictly compares the voltage signals according to the set threshold, which can accurately identify abnormal vibration conditions. Once the vibration exceeds the normal range, the vibration alarm module is immediately activated, quickly notifying the operator in the form of an alarm to help them respond in a timely manner. At the same time, after detecting an abnormal signal, the protection module quickly cuts off the power supply to the vibrating screen to avoid irreversible damage to the equipment caused by continuous abnormal vibration, effectively reducing the equipment failure rate, reducing maintenance frequency and costs, improving the reliability, safety and stability of the vibrating screen operation, and ensuring the efficient and continuous operation of production. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the online monitoring system for vibrating screens provided in the embodiments of this application;

[0023] Figure 2 This is a circuit diagram of an online monitoring system for a vibrating screen provided in an embodiment of this application;

[0024] Figure 3 This is a circuit diagram of an online monitoring system for a vibrating screen provided in another embodiment of this application. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] The implementation of this application will be described in detail below with reference to the specific accompanying drawings:

[0028] Figure 1 This is a schematic diagram of an online monitoring system for a vibrating screen provided in an embodiment of this application. (Refer to...) Figure 1 The online monitoring system for the vibrating screen includes: a vibration monitoring module, a frequency-to-voltage conversion module, a comparison module, a vibration alarm module, and a protection module.

[0029] The vibration monitoring module is configured to monitor the vibration status of the vibrating screen. The output of the vibration monitoring module is connected to the input of the frequency-voltage conversion module, the output of the frequency-voltage conversion module is connected to the input of the comparison module, and the output of the comparison module is connected to the control terminal of the vibration alarm module.

[0030] The control terminal of the protection module is connected to the output terminal of the comparison module, the first terminal of the protection module is connected to the power supply, and the second terminal of the protection module is connected to the power supply terminal of the vibrating screen.

[0031] In this embodiment, the vibration of the vibrating screen is monitored by the principle of electromagnetic induction. A magnet can be fixed on the screen mesh of the vibrating screen. When the vibrating screen is working, the magnet can be moved along with the vibration of the screen mesh.

[0032] This embodiment is based on the principle of electromagnetic induction. By fixing a magnet to the screen of a vibrating screen, when the vibrating screen is working, the screen drives the magnet to vibrate, causing the magnetic field around the magnet to change regularly. The vibration monitoring module detects this magnetic field change and converts it into a pulse signal output.

[0033] In this embodiment, the frequency-to-voltage conversion module receives the pulse signal output by the vibration monitoring module and converts it into a corresponding voltage signal. The purpose is to convert the pulse signal into a voltage signal form that is easier to compare and process, making it easier to compare and judge the voltage signal with a set threshold.

[0034] In this embodiment, the comparison module compares the voltage signal output by the frequency-to-voltage conversion module with a preset threshold. The threshold can be set according to the voltage signal range corresponding to the vibration state of the vibrating screen during normal operation. By comparing, it can be determined whether the vibration state of the vibrating screen is normal.

[0035] In this embodiment, when the comparison module determines that the voltage signal exceeds a set threshold, it indicates that the vibration of the vibrating screen is abnormal. At this time, the vibration alarm module receives the output signal from the comparison module and issues an alarm signal to remind the operator to take timely measures to avoid equipment failure or other safety problems. In this embodiment, the alarm signal can be a light alarm signal, a sound alarm signal, or a combined sound and light alarm signal, etc.

[0036] In this embodiment, the control terminal of the protection module is connected to the output terminal of the comparison module. When the comparison module detects that the voltage signal exceeds the threshold, i.e., abnormal vibration, the protection module activates. The first terminal of the protection module is connected to the power supply, and the second terminal is connected to the power supply terminal of the vibrating screen. The protection module can cut off the power supply to the vibrating screen, thereby protecting the vibrating screen equipment and preventing further damage to the equipment or other safety accidents caused by abnormal vibration.

[0037] As can be seen from the above, the vibration monitoring module, based on the principle of electromagnetic induction, senses the vibration status of the vibrating screen in real time, not missing any abnormal signs. The frequency-voltage conversion module cleverly converts pulse signals into voltage signals, laying the foundation for subsequent accurate judgment. The comparison module strictly compares the voltage signals according to the set threshold, which can accurately identify abnormal vibration conditions. Once the vibration exceeds the normal range, the vibration alarm module is immediately activated, quickly notifying the operator in the form of an alarm to help them respond promptly. At the same time, after detecting an abnormal signal, the protection module quickly cuts off the power supply to the vibrating screen to avoid irreversible damage to the equipment caused by continuous abnormal vibration, effectively reducing the equipment failure rate, reducing maintenance frequency and costs, improving the reliability, safety and stability of the vibrating screen operation, and ensuring the efficient and continuous operation of production.

[0038] like Figure 2 As shown, in one embodiment of this disclosure, the vibration monitoring module includes: a rheostat RP1, an electromagnetic coil L1, a magnetic block U5, a switching transistor Q1, and a resistor R1;

[0039] The magnetic block U5 is fixedly installed on the screen of the vibrating screen. The first end of the rheostat RP1 is connected to the VCC power supply, the second end of the rheostat RP1 is grounded, the sliding end of the rheostat RP1 is connected to the control end of the switching tube Q1, the first end of the switching tube Q1 is connected to the VCC power supply through the resistor R1, the second end of the switching tube Q1 is grounded, and the first end of the switching tube Q1 is connected to the input end of the frequency-voltage conversion module.

[0040] In this embodiment, the magnetic block U5 is fixed to the screen of the vibrating screen. When the vibrating screen is running, the screen drives the magnetic block U5 to vibrate, causing a change in the magnetic field around the magnetic block U5. The electromagnetic coil L1 uses the principle of electromagnetic induction to monitor the change in the magnetic field around the magnetic block U5. When the magnetic block U5 is close to the electromagnetic coil L1, the magnetic flux through the electromagnetic coil L1 increases, and according to the law of electromagnetic induction, an induced current is generated in the electromagnetic coil L1; when the magnetic block U5 is away from the electromagnetic coil L1, the magnetic flux through the electromagnetic coil L1 decreases, and the induced current in the electromagnetic coil L1 decreases. The rheostat RP1 is used to provide an adjustable control voltage for the switching transistor Q1. By adjusting the position of the sliding end, the conduction threshold of the switching transistor Q1 can be changed. The switching transistor Q1 controls its conduction and closing states according to the current signal on the electromagnetic coil L1. When a sufficiently large current signal is generated on the electromagnetic coil L1, the switching transistor Q1 conducts; when the current on the electromagnetic coil L1 decreases to a certain level, the switching transistor Q1 closes.

[0041] In this embodiment, when the vibrating screen is operating normally, the vibration of the screen mesh is regular, and the magnetic block U5 vibrates regularly with the screen mesh, causing the magnetic field around the magnetic block U5 to change regularly as well. After detecting this regular magnetic field change, the electromagnetic coil L1 generates a regular induced current. The switch Q1 turns on and off regularly according to the magnitude of the induced current, thereby generating a stable frequency pulse signal at the first terminal of the switch Q1. When the vibrating screen operates abnormally, the vibration of the screen mesh becomes irregular, and the vibration of the magnetic block U5 also becomes irregular, causing irregular changes in the magnetic field around the magnetic block U5. After detecting this irregular magnetic field change, the electromagnetic coil L1 generates an irregular induced current. The switch Q1 turns on and off according to the irregular induced current, causing the frequency of the pulse signal output from the first terminal of the switch Q1 to change. The first terminal of the switch Q1 is connected to the input terminal of the frequency-to-voltage conversion module, outputting the generated pulse signal to the frequency-to-voltage conversion module.

[0042] As can be seen from the above, the vibration monitoring module of this embodiment converts the vibration state of the vibrating screen into an electrical signal through the magnetic block U5 and the electromagnetic coil L1, and then converts the electrical signal into a pulse signal output through the switching tube Q1, thereby realizing the monitoring of the vibration state of the vibrating screen.

[0043] like Figure 2 As shown, in one embodiment of this disclosure, the vibration monitoring module further includes: capacitor C2, transistor Q2, resistor R10, resistor R13 and resistor R4;

[0044] The first end of capacitor C2 is connected to the first end of switching transistor Q1, the second end of capacitor C2 is connected to the base of transistor Q2, the second end of capacitor C2 is connected to the collector of transistor Q2 through resistor R13, the collector of transistor Q2 is connected to VCC power supply through resistor R10, the emitter of transistor Q2 is grounded through resistor R4, and the emitter of transistor Q2 is connected to the input terminal of the frequency-to-voltage conversion module.

[0045] In this embodiment, the pulse signal at the first terminal of the switch Q1 is relatively weak. The capacitor C2, transistor Q2, resistor R10, resistor R13 and resistor R4 constitute an amplifier circuit to amplify the pulse signal.

[0046] The weak pulse signal output from switching transistor Q1 is coupled through capacitor C2, removing the DC component, and then input as an AC pulse signal to the base of transistor Q2. The input pulse signal causes a change in the base current of transistor Q2. According to the current amplification principle of transistors, the collector current can change significantly with the change in base current. This change in collector current of transistor Q2 is converted into a voltage change through resistor R10, resulting in an amplified pulse signal at the collector of transistor Q2. This amplified signal is then output from the emitter of transistor Q2 and finally connected to the input of the frequency-to-voltage conversion module.

[0047] As can be seen from the above, the pulse signal output by the switching transistor Q1 is weak, easily interfered with, and difficult to process. However, the amplifier circuit composed of capacitor C2, transistor Q2, etc., can effectively amplify the pulse signal, enhance its anti-interference capability, ensure signal quality, provide a stable and reliable input to the frequency-to-voltage conversion module, and guarantee the accurate operation of the vibrating screen online monitoring system.

[0048] like Figure 3 As shown, in one embodiment of this disclosure, resistors R2, rheostat RP2, and resistor R3 are used instead of resistors R10 and R13;

[0049] The first end of resistor R2 is connected to the VCC power supply. The second end of resistor R2 is connected to the first end of resistor R3 through rheostat RP2. The sliding end of rheostat RP2 is connected to the base of transistor Q2. The collector of transistor Q2 is connected to the VCC power supply.

[0050] In this embodiment, the voltage divider circuit consisting of resistor R2, rheostat RP2, and resistor R3 can distribute the VCC power supply voltage according to the resistance ratio of each resistor.

[0051] By changing the resistance of the variable resistor RP2, the resistance ratio of the voltage divider circuit can be altered, thereby changing the base voltage of transistor Q2. When the resistance of RP2 connected to the circuit is increased, the proportion of RP2 in the total resistance increases, and according to the voltage divider formula, the base voltage of transistor Q2 can increase. When the resistance of RP2 connected to the circuit is decreased, the proportion of RP2 in the total resistance decreases, and the base voltage of transistor Q2 can decrease.

[0052] Since adjusting the variable resistor RP2 changes the base voltage of transistor Q2, it's equivalent to altering the transistor's conduction condition. When the environment changes, such as alterations in the vibration characteristics of the vibrating screen or different external interference factors, adjusting RP2 can adjust the conduction voltage of transistor Q2, enabling the vibration monitoring module to respond more accurately to vibration signals. For example, in environments with severe vibration, the conduction voltage of transistor Q2 can be appropriately increased to avoid false triggering due to normal vibration fluctuations; while in environments with relatively weak vibration, the conduction voltage can be decreased to improve the module's sensitivity to weak vibration signals.

[0053] As can be seen from the above, this embodiment adjusts the conduction voltage of transistor Q2 by changing the resistance value of rheostat RP2, enabling the vibration monitoring module to be flexibly adjusted according to different environmental conditions, thereby improving the adaptability and accuracy of the online monitoring system for vibrating screens.

[0054] like Figure 3 As shown, in one embodiment of this disclosure, the frequency-to-voltage conversion module includes: diode D1, resistor R5, resistor R8, transistor Q3, resistor R7, capacitor C4, operational amplifier U1, and resistor R6.

[0055] The cathode of diode D1 is connected to the output terminal of the vibration monitoring module, and the anode of diode D1 is grounded through resistor R5. The anode of diode D1 is connected to the control terminal of transistor Q3. The first terminal of transistor Q3 is connected to the VCC power supply through resistor R8. The second terminal of transistor Q3 is connected to the inverting input terminal of operational amplifier U1. The non-inverting input terminal of operational amplifier U1 is grounded through resistor R6. The output terminal of operational amplifier U1 is connected to the inverting input terminal of operational amplifier U1 through capacitor C4. The output terminal of operational amplifier U1 is connected to the first terminal of transistor Q3 through resistor R7. The output terminal of operational amplifier U1 is connected to the input terminal of the comparator module.

[0056] In this embodiment, a unijunction transistor can be used as transistor Q3. The control terminal of transistor Q3 is the emitter of the unijunction transistor, the first terminal of transistor Q3 is the first base of the unijunction transistor, and the second terminal of transistor Q3 is the second base of the unijunction transistor.

[0057] In this embodiment, the pulse signal output by the vibration monitoring module is rectified by diode D1, allowing only the positive pulse signal to pass through. After current limiting and voltage division by resistor R5, it is transmitted to the emitter of transistor Q3. When the emitter voltage reaches the conduction threshold of the unijunction transistor, the unijunction transistor conducts, generating a current between the first and second bases. This converts the pulse signal into an electrical signal related to the pulse frequency and transmits it to the inverting input of operational amplifier U1. Operational amplifier U1 processes the input signal. The integral effect of capacitor C4 makes the output voltage of operational amplifier U1 proportional to the frequency of the input pulse signal. That is, the higher the frequency of the input pulse signal, the faster capacitor C4 charges, and the higher the output voltage of operational amplifier U1; conversely, the lower the frequency of the input pulse signal, the lower the output voltage of operational amplifier U1. The output terminal of operational amplifier U1 is connected to the first base of transistor Q3 through resistor R7, forming negative feedback to stabilize the operating state of transistor Q3 and the output voltage of operational amplifier U1, preventing circuit instability. Finally, the output terminal of operational amplifier U1 outputs the converted voltage signal to the comparator module.

[0058] As can be seen from the above, the frequency-to-voltage conversion module, through the coordinated operation of diode D1 rectification, transistor Q3 signal conversion, and operational amplifier U1 integration and feedback, can accurately convert the pulse signal output by the vibration monitoring module into a voltage signal. This provides an adaptation signal for the subsequent comparison module, ensuring the accuracy of the system's vibration state monitoring and judgment, and improving the overall performance of the vibrating screen online monitoring system.

[0059] like Figure 3 As shown, in one embodiment of this disclosure, the comparison module includes: operational amplifier U2, operational amplifier U3, and OR gate U4;

[0060] The non-inverting input of op-amp U2 is connected to the output of the frequency-to-voltage conversion module, the inverting input of op-amp U2 is connected to the reference voltage V1, and the output of op-amp U2 is connected to the first input of OR gate U4.

[0061] The non-inverting input of op-amp U3 is connected to the reference voltage V2, the inverting input of op-amp U3 is connected to the output of the frequency-to-voltage conversion module, the output of op-amp U3 is connected to the second input of OR gate U4, and the output of OR gate U4 is connected to the control terminal of the alarm module.

[0062] In this embodiment, the reference voltage V1 is greater than the reference voltage V2.

[0063] In this embodiment, the voltage signal output by the frequency-to-voltage conversion module is transmitted to the non-inverting input of operational amplifier U2 and the inverting input of operational amplifier U3, respectively. Operational amplifiers U2 and U3 constitute a voltage range comparison circuit. When the voltage signal output by the frequency-to-voltage conversion module exceeds the range of V2 to V1, the corresponding operational amplifier is triggered to output a high-level signal.

[0064] The output signals of operational amplifiers U2 and U3 serve as the inputs of OR gate U4. If the voltage signal output by the frequency-to-voltage conversion module is higher than the reference voltage V1, operational amplifier U2 outputs a high level, and the first input of OR gate U4 is high. At this time, regardless of the output of operational amplifier U3, OR gate U4 outputs a high level.

[0065] If the voltage signal output by the frequency-to-voltage conversion module is lower than the reference voltage V2, the op-amp U3 outputs a high level, and the second input of the OR gate U4 is high. Similarly, regardless of the output of op-amp U2, the OR gate U4 outputs a high level.

[0066] Only when the voltage signal output by the frequency-to-voltage conversion module is between V2 and V1, op-amps U2 and U3 both output a low level, and OR gate U4 outputs a low level.

[0067] The output of OR gate U4 is connected to the control terminal of the alarm module. When OR gate U4 outputs a high level, it indicates that the voltage signal output by the frequency-voltage conversion module exceeds the normal range, meaning that the vibration state of the vibrating screen is abnormal. At this time, the alarm module is triggered to issue an alarm.

[0068] When the output of OR gate U4 is low, it indicates that the voltage signal output by the frequency-voltage conversion module is within the normal range, the vibration state of the vibrating screen is normal, and the alarm module does not issue an alarm.

[0069] As can be seen from the above, the comparison module in this embodiment compares the voltage signal output by the frequency-to-voltage conversion module with the reference voltage through two operational amplifiers, and uses an OR gate for logical judgment, thereby realizing the monitoring of the vibration state of the vibrating screen and the control of abnormal alarms.

[0070] like Figure 3 As shown, in one embodiment of this disclosure, the alarm module includes: a resistor R9, a transistor Q4, and a light-emitting diode LED1;

[0071] The first end of resistor R9 is connected to the output of the comparator module, the second end of resistor R9 is connected to the base of transistor Q4, the collector of transistor Q4 is connected to the VCC power supply, the emitter of transistor Q4 is connected to the anode of LED1, and the cathode of LED1 is grounded.

[0072] In this embodiment, when the comparison module determines that the vibration state of the vibrating screen is normal, its output terminal outputs a low level. At this time, there is no voltage difference across resistor R9, and no current flows into the base of transistor Q4, so transistor Q4 is in the cutoff state. Because transistor Q4 is cut off, the circuit between the VCC power supply and LED1 is interrupted, and no current flows through LED1, so LED1 is off, indicating that the vibrating screen is working normally and no abnormality has occurred.

[0073] In this embodiment, when the comparison module determines that the vibration state of the vibrating screen is abnormal, its output terminal outputs a high level. The high-level signal provides current to the base of transistor Q4 through resistor R9. When the base current reaches a certain value, transistor Q4 conducts, which is equivalent to closing a switch. At this time, a complete circuit is formed between VCC power supply, transistor Q4, LED1, and ground, and current flows through LED1, causing LED1 to light up and issue an alarm signal to remind the operator that the vibrating screen may have an abnormality and needs to be checked and handled.

[0074] As can be seen from the above, the alarm module, through the coordinated operation of resistor R9, transistor Q4 and LED1, realizes the alarm function for abnormal conditions of the vibrating screen based on the output signal of the comparison module.

[0075] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 application.

Claims

1. A vibrating screen on-line monitoring system characterized by, The vibration monitoring module, the frequency-voltage conversion module, the comparison module, the vibration alarm module and the protection module are included. The vibration monitoring module is configured to monitor the vibration state of the vibrating screen, the output end of the vibration monitoring module is connected to the input end of the frequency-voltage conversion module, the output end of the frequency-voltage conversion module is connected to the input end of the comparison module, and the output end of the comparison module is connected to the control end of the vibration alarm module. The control end of the protection module is connected to the output end of the comparison module, the first end of the protection module is connected to the power supply, and the second end of the protection module is connected to the power supply end of the vibrating screen. The vibration monitoring module includes a rheostat RP1, an electromagnetic coil L1, a magnetic block U5, a switch tube Q1 and a resistor R1.

2. The on-line monitoring system of a vibrating screen of claim 1, wherein, The magnetic block U5 is fixedly arranged on the screen of the vibrating screen, the first end of the rheostat RP1 is connected to the VCC power supply, the second end of the rheostat RP1 is grounded, the sliding end of the rheostat RP1 is connected to the control end of the switch tube Q1, the first end of the switch tube Q1 is connected to the VCC power supply through the resistor R1, the second end of the switch tube Q1 is grounded, and the first end of the switch tube Q1 is connected to the input end of the frequency-voltage conversion module. The vibration monitoring module further includes a capacitor C2, a triode Q2, a resistor R10, a resistor R13 and a resistor R4.

3. The on-line monitoring system of a vibrating screen of claim 2, wherein, The first end of the capacitor C2 is connected to the first end of the switch tube Q1, the second end of the capacitor C2 is connected to the base of the triode Q2, the second end of the capacitor C2 is connected to the collector of the triode Q2 through the resistor R13, the collector of the triode Q2 is connected to the VCC power supply through the resistor R10, the emitter of the triode Q2 is grounded through the resistor R4, and the emitter of the triode Q2 is connected to the input end of the frequency-voltage conversion module. The resistor R2, the rheostat RP2 and the resistor R3 are used to replace the resistor R10 and the resistor R13.

4. The on-line monitoring system of a vibrating screen of claim 3, wherein, The first end of the resistor R2 is connected to the VCC power supply, the second end of the resistor R2 is connected to the first end of the resistor R3 through the rheostat RP2, the sliding end of the rheostat RP2 is connected to the base of the triode Q2, and the collector of the triode Q2 is connected to the VCC power supply. The frequency-voltage conversion module includes a diode D1, a resistor R5, a resistor R8, a transistor Q3, a resistor R7, a capacitor C4, an operational amplifier U1 and a resistor R6.

5. The on-line monitoring system of a vibrating screen of claim 1, wherein, The cathode of the diode D1 is connected to the output end of the vibration monitoring module, the anode of the diode D1 is grounded through the resistor R5, the anode of the diode D1 is connected to the control end of the transistor Q3, the first end of the transistor Q3 is connected to the VCC power supply through the resistor R8, the second end of the transistor Q3 is connected to the inverting input end of the operational amplifier U1, the non-inverting input end of the operational amplifier U1 is grounded through the resistor R6, the output end of the operational amplifier U1 is connected to the inverting input end of the operational amplifier U1 through the capacitor C4, the output end of the operational amplifier U1 is connected to the first end of the transistor Q3 through the resistor R7, and the output end of the operational amplifier U1 is connected to the input end of the comparison module. ​ 6. The on-line monitoring system of a vibrating screen of claim 1, wherein, The comparison module comprises: an operational amplifier U2, an operational amplifier U3 and an OR gate U4; The non-inverting input terminal of the operational amplifier U2 is connected to the output terminal of the frequency-voltage conversion module, the inverting input terminal of the operational amplifier U2 is connected to a V1 reference voltage, and the output terminal of the operational amplifier U2 is connected to the first input terminal of the OR gate U4; The non-inverting input terminal of the operational amplifier U3 is connected to a V2 reference voltage, the inverting input terminal of the operational amplifier U3 is connected to the output terminal of the frequency-voltage conversion module, the output terminal of the operational amplifier U3 is connected to the second input terminal of the OR gate U4, and the output terminal of the OR gate U4 is connected to the control terminal of the alarm module.

7. The on-line monitoring system of a vibrating screen of claim 1, wherein, The alarm module comprises: a resistor R9, a triode Q4 and a light-emitting diode LED1; The first terminal of the resistor R9 is connected to the output terminal of the comparison module, the second terminal of the resistor R9 is connected to the base of the triode Q4, the collector of the triode Q4 is connected to a VCC power supply, the emitter of the triode Q4 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is grounded.

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