Jigging machine air valve fault detection system

Abstract

The utility model provides a jigger air valve fault detection system. The jigger air valve fault detection system comprises an air valve working frequency detection circuit, the air valve working frequency detection circuit comprises a resonance circuit, a detection circuit and a comparison circuit which are connected in sequence, and the resonance circuit is used for outputting sinusoidal oscillation signals and comprises an inductive probe. The inductance value of the inductive probe and the position of the air valve body change in the same proportion, the detection circuit is used for converting sine oscillation signals output by the resonance circuit into direct current signals, and the first input end of the comparison circuit is connected with a first power source. The second input end of the comparison circuit is connected with the output end of the detection circuit, and the output end of the comparison circuit is used for being connected with a controller. The fault of the jigger can be detected in time.

Description

Technical Field

[0001] The present disclosure relates to the technical field of equipment detection, and in particular to a jigger air valve fault detection system. Background Art

[0002] Jigging separation is the process of sorting materials according to density in a vertically rising and falling variable speed water flow. Jigging machine is a device that realizes the jigging process and is a commonly used separation equipment.

[0003] The jig machine air valve is a key component of the jig machine. It controls the pulsation of the jig machine and directly determines the sorting accuracy of the jig machine. For a long time, experts have conducted a lot of research and improvement on the air valve structure. The performance of the air valve directly determines the sorting effect of the jig machine. The early sliding air valve and rotary air valve were all mechanically driven, with relatively slow movement speed and inconvenient frequency adjustment. Now the jig machine mostly uses CNC pneumatic air valves, which use cylinders to drive the air valve to move. The air valve structure is simple, the opening speed is fast, and good process effects can be obtained. This air valve is composed of CNC system, solenoid valve, cylinder and air valve. The CNC system controls the solenoid valve and cylinder to control the intake valve and exhaust valve to realize the pulsation of the jig bed. The characteristics of the electric control pneumatic air valve are: flexible and convenient adjustment of the jig frequency and periodic characteristics, strong adaptability to raw coals with different selectivity; the intake and exhaust air valves open quickly, the bed vibration explosive force is strong, the sorting accuracy is high, and the processing capacity is large.

[0004] The working environment of the jig machine air valve is harsh, with dust and coal sludge water, and the action frequency is 45-60 times / minute. In production, abnormal action of the air valve often occurs, affecting the work of the jig machine. If it is not discovered in time, it will seriously affect the working effect of the jig machine. Utility Model Content

[0005] The disclosed embodiment provides a jigger air valve fault detection system to solve the problem that jigger faults cannot be discovered in time.

[0006] The embodiment of the present disclosure provides a jigger air valve fault detection system, comprising: an air valve operating frequency detection circuit, wherein the air valve operating frequency detection circuit comprises a resonance circuit, a detection circuit and a comparison circuit connected in sequence,

[0007] The resonant circuit is used to output a sinusoidal oscillation signal, the resonant circuit includes an induction probe, the inductance of the induction probe changes in proportion to the position of the air valve body, the detection circuit is used to convert the sinusoidal oscillation signal output by the resonant circuit into a DC signal, the first input end of the comparison circuit is connected to a first power supply, the second input end of the comparison circuit is connected to the output end of the detection circuit, and the output end of the comparison circuit is used to be connected to a controller.

[0008] In an exemplary embodiment of the present disclosure, the detection circuit includes a voltage follower, an amplifier circuit and a peak detection circuit connected in sequence, the input end of the voltage follower is connected to the output end of the resonant circuit, and the output of the peak detection circuit serves as the output end of the detection circuit and is connected to the comparison circuit.

[0009] In an exemplary embodiment of the present disclosure, the amplifying circuit includes an operational amplifier U1B, a non-inverting input terminal of the operational amplifier U1B is connected to the output terminal of the voltage follower, an inverting input terminal of the operational amplifier U1B is grounded via a resistor R16, an output terminal of the operational amplifier U1B is feedback-connected to the inverting input terminal of the operational amplifier U1B via a resistor R11, and an output terminal of the operational amplifier U1B serves as an output terminal of the amplifying circuit.

[0010] In an exemplary embodiment of the present disclosure, the peak detection circuit includes a diode D1, a resistor R9, a capacitor C1 and an operational amplifier U1C, the anode of the diode D1 is connected to the output end of the amplifier circuit, the cathode of the diode D1 is connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, the two ends of the resistor R9 are connected in parallel with the capacitor C1, the first end of the capacitor C1 is connected to the non-inverting input end of the operational amplifier U1C, the output end of the operational amplifier U1C is feedback connected to the inverting input end of the operational amplifier U1C, and the output end of the operational amplifier U1C serves as the output end of the peak detection circuit.

[0011] In an exemplary embodiment of the present disclosure, the comparison circuit includes a switch tube Q1 and a switch tube Q2, the first end of the switch tube Q1 is the first input end of the comparison circuit, the control end of the switch tube Q1 is the second input end of the comparison circuit, and the second end of the switch tube Q1 is grounded through a resistor R2.

[0012] The first end of the switch tube Q1 is connected to the first end of the switch tube Q2, the control end of the switch tube Q2 is connected to the second end of the switch tube Q1, and the second end of the switch tube Q2 is the output end of the comparison circuit.

[0013] In an exemplary embodiment of the present disclosure, a damper control circuit is also included, which includes an optocoupler U3 and a switch tube Q3. The first input end of the optocoupler U3 is used to connect to the PWM output end of the controller, the second input end of the optocoupler U3 is grounded, the first output end of the optocoupler U3 is connected to the first power supply through a resistor R38, the second output end of the optocoupler U3 is grounded, the second output end of the optocoupler U3 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the first end of the damper coil, the second end of the damper coil is connected to the second power supply, and the second end of the switch tube Q3 is grounded.

[0014] In an exemplary embodiment of the present disclosure, a primary alarm circuit and a secondary alarm circuit are also included.

[0015] The disclosed embodiment provides a jigger air valve fault detection system, which detects the air valve body movement frequency by setting the air valve working frequency detection circuit. If the valve body movement frequency is too small, it indicates that the valve body is not moving properly, that is, an air valve fault has occurred, thereby achieving timely detection of the air valve fault.

[0016] The inductive probe is an inductive probe. When an alternating current is passed through the inductive probe, an alternating magnetic field is generated around the inductive probe. When the valve body is close to the inductive probe, the alternating magnetic field induces eddy current in the valve body. The eddy current reacts on the inductive probe, which causes the output voltage of the resonant circuit where the inductive probe is located to change. The smaller the distance between the valve body and the inductive probe, the greater the output voltage of the resonant circuit. The larger the distance between the valve body and the inductive probe, the smaller the output voltage of the resonant circuit. The output voltage of the resonant circuit is converted into a DC signal by the detection circuit. When the distance between the valve body and the inductive probe is less than the set value, the output voltage of the detection circuit is greater than the first power supply, and the comparison circuit outputs a low level. When the distance between the valve body and the inductive probe is greater than the set value, the output voltage of the detection circuit is less than the first power supply, and the comparison circuit outputs a high level. In this way, as the valve body moves repeatedly, the output end of the comparison circuit outputs a pulse signal. The output end of the comparison circuit is connected to the controller, and the controller can obtain the working frequency of the air valve by calculating the frequency of the pulse signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 is a schematic diagram of a wind valve operating frequency detection circuit provided by an embodiment of the present disclosure;

[0019] Figure 2 is a schematic diagram of a comparison circuit provided by an embodiment of the present disclosure;

[0020] Figure 3 It is a schematic diagram of the air valve control circuit provided in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0022] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0023] The following is a detailed description of the implementation of the present disclosure in conjunction with the specific drawings:

[0024] The jigger air valve fault detection system of this embodiment includes an air valve operating frequency detection circuit. Figure 1 The air valve operating frequency detection circuit includes a resonance circuit, a detection circuit and a comparison circuit connected in sequence.

[0025] The resonant circuit is used to output a sinusoidal oscillation signal. The resonant circuit includes an induction probe. The inductance of the induction probe changes in proportion to the position of the air valve body. The detection circuit is used to convert the sinusoidal oscillation signal output by the resonant circuit into a DC signal. The first input end of the comparison circuit is connected to the first power supply, the second input end of the comparison circuit is connected to the output end of the detection circuit, and the output end of the comparison circuit is used to be connected to the controller.

[0026] In this embodiment, the air valve operating frequency detection circuit is set to detect the action frequency of the air valve body. If the valve body action frequency is too small, it indicates that the valve body is not moving properly, that is, an air valve failure has occurred, thereby achieving timely detection of the air valve failure.

[0027] The inductive probe is an inductive probe. When an alternating current is passed through the inductive probe, an alternating magnetic field is generated around the inductive probe. When the valve body is close to the inductive probe, the alternating magnetic field induces eddy current in the valve body. The eddy current reacts on the inductive probe, which causes the output voltage of the resonant circuit where the inductive probe is located to change. The smaller the distance between the valve body and the inductive probe, the greater the output voltage of the resonant circuit. The larger the distance between the valve body and the inductive probe, the smaller the output voltage of the resonant circuit. The output voltage of the resonant circuit is converted into a DC signal by the detection circuit. When the distance between the valve body and the inductive probe is less than the set value, the output voltage of the detection circuit is greater than the first power supply, and the comparison circuit outputs a low level. When the distance between the valve body and the inductive probe is greater than the set value, the output voltage of the detection circuit is less than the first power supply, and the comparison circuit outputs a high level. In this way, as the valve body moves repeatedly, the output end of the comparison circuit outputs a pulse signal. The output end of the comparison circuit is connected to the controller, and the controller can obtain the working frequency of the air valve by calculating the frequency of the pulse signal.

[0028] It should be noted that the controller may be a currently commonly used single-chip microcomputer, DSP, ARM or other microcontroller. This embodiment specifically uses the ARM chip STM32F103.

[0029] Reference Figure 1 In an exemplary embodiment of the present disclosure, the detection circuit includes a voltage follower, an amplifier circuit and a peak detection circuit connected in sequence, the input end of the voltage follower is connected to the output end of the resonant circuit, and the output of the peak detection circuit serves as the output end of the detection circuit and is connected to the comparison circuit.

[0030] In this embodiment, the voltage follower has the characteristics of large input resistance, small output resistance and strong load capacity, thereby realizing impedance matching between the resonant circuit and the detection circuit; the amplifier circuit is used to amplify the output voltage of the resonant circuit, which is beneficial to improving the signal detection accuracy; the sinusoidal oscillation voltage signal output by the resonant circuit passes through the peak detection circuit, and then outputs the peak voltage of the sinusoidal oscillation voltage signal, thereby realizing the conversion of the sinusoidal oscillation signal to a DC signal.

[0031] Reference Figure 1 In an exemplary embodiment of the present disclosure, the amplifier circuit includes an operational amplifier U1B, a non-inverting input terminal of the operational amplifier U1B is connected to the output terminal of the voltage follower, an inverting input terminal of the operational amplifier U1B is grounded through a resistor R16, an output terminal of the operational amplifier U1B is feedback-connected to the inverting input terminal of the operational amplifier U1B through a resistor R11, and an output terminal of the operational amplifier U1B serves as an output terminal of the amplifier circuit.

[0032] In this embodiment, the operational amplifier U1B, the resistor R16 and the resistor R11 constitute a common-phase proportional amplifier circuit for amplifying the output voltage of the resonant circuit. The amplification factor of the signal can be adjusted by adjusting the resistance values ​​of the resistor R16 and the resistor R11.

[0033] Reference Figure 1 In an exemplary embodiment of the present disclosure, the peak detection circuit includes a diode D1, a resistor R9, a capacitor C1 and an operational amplifier U1C, the anode of the diode D1 is connected to the output end of the amplifier circuit, the cathode of the diode D1 is connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, the two ends of the resistor R9 are connected in parallel with the capacitor C1, the first end of the capacitor C1 is connected to the non-inverting input end of the operational amplifier U1C, the output end of the operational amplifier U1C is feedback connected to the inverting input end of the operational amplifier U1C, and the output end of the operational amplifier U1C serves as the output end of the peak detection circuit.

[0034] In this embodiment, in the positive half cycle of the sinusoidal oscillation signal, the diode is turned on, and the output voltage of the amplifier circuit charges the capacitor C1. When the capacitor C1 is fully charged, the voltage across the capacitor C1 is maintained at the peak voltage of the output voltage of the amplifier circuit; in the negative half cycle of the sinusoidal oscillation signal, the diode is turned off, and the capacitor C1 is discharged through the resistor R1 to prepare for the next charging. The operational amplifier U1C constitutes a voltage follower, which plays the role of signal isolation buffer.

[0035] Reference Figure 2 In an exemplary embodiment of the present disclosure, the comparison circuit includes a switch tube Q1 and a switch tube Q2, the first end of the switch tube Q1 is the first input end of the comparison circuit, the control end of the switch tube Q1 is the second input end of the comparison circuit, and the second end of the switch tube Q1 is grounded through a resistor R2.

[0036] The first end of the switch tube Q1 is connected to the first end of the switch tube Q2, the control end of the switch tube Q2 is connected to the second end of the switch tube Q1, and the second end of the switch tube Q2 is the output end of the comparison circuit.

[0037] In this embodiment, when the output of the detection circuit is less than the set value (the voltage at the first end of the switch tube Q1), the switch tube Q1 is turned on, the switch tube Q2 is turned off, and the second end of the switch tube Q2 outputs a low level; when the output of the detection circuit is greater than the set value (the voltage at the first end of the switch tube Q1), the switch tube Q1 is turned off, the switch tube Q2 is turned on, and the second end of the switch tube Q2 outputs a high level.

[0038] Reference Figure 3In an exemplary embodiment of the present disclosure, a damper control circuit is also included, the damper control circuit includes an optocoupler U3 and a switch tube Q3, the first input end of the optocoupler U3 is used to connect to the PWM output end of the controller, the second input end of the optocoupler U3 is grounded, the first output end of the optocoupler U3 is connected to the first power supply through a resistor R38, the second output end of the optocoupler U3 is grounded, the second output end of the optocoupler U3 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the first end of the damper coil, the second end of the damper coil is connected to the second power supply, and the second end of the switch tube Q3 is grounded.

[0039] In this embodiment, according to actual needs, the controller outputs a PWM signal of a corresponding frequency to the control end of the switch tube Q3, and realizes pulse control of the air valve by controlling the on and off of the switch tube. The optical coupler U3 realizes electrical isolation between the controller and the air valve control circuit, preventing interference signals on the air valve side from entering the controller, thereby ensuring reliable operation of the controller.

[0040] In an exemplary embodiment of the present disclosure, a primary alarm circuit and a secondary alarm circuit are also included.

[0041] In this embodiment, both the first alarm circuit and the second alarm circuit can use sound / light alarm circuits to generate sound / light alarm signals to remind the staff to deal with it in time. When the deviation rate between the actual working frequency of the air valve and the preset working frequency is ≤A, it is determined that a minor fault has occurred, and the first alarm circuit can be activated without stopping the system; when the deviation rate between the actual working frequency of the air valve and the preset working frequency of the air valve is >A, it is determined that a serious fault has occurred, and the second alarm circuit is activated, and production needs to be stopped as soon as possible to deal with the fault. The value A can be set according to the nature of the coal preparation plant and the importance of the jig sorting products in the coal preparation plant.

[0042] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A jig machine air valve fault detection system, characterized in that: It includes a wind valve operating frequency detection circuit, which includes a resonance circuit, a detection circuit and a comparison circuit connected in sequence. The resonant circuit is used to output a sinusoidal oscillation signal, the resonant circuit includes an induction probe, the inductance of the induction probe changes in proportion to the position of the air valve body, the detection circuit is used to convert the sinusoidal oscillation signal output by the resonant circuit into a DC signal, the first input end of the comparison circuit is connected to a first power supply, the second input end of the comparison circuit is connected to the output end of the detection circuit, and the output end of the comparison circuit is used to be connected to a controller.

2. The jig machine air valve fault detection system according to claim 1, characterized in that: The detection circuit includes a voltage follower, an amplifier circuit and a peak detection circuit connected in sequence, the input end of the voltage follower is connected to the output end of the resonant circuit, and the output of the peak detection circuit serves as the output end of the detection circuit and is connected to the comparison circuit.

3. The jig air valve fault detection system according to claim 2, characterized in that: The amplifier circuit includes an operational amplifier U1B, the non-inverting input terminal of the operational amplifier U1B is connected to the output terminal of the voltage follower, the inverting input terminal of the operational amplifier U1B is grounded through a resistor R16, the output terminal of the operational amplifier U1B is feedback-connected to the inverting input terminal of the operational amplifier U1B through a resistor R11, and the output terminal of the operational amplifier U1B serves as the output terminal of the amplifier circuit.

4. The jig air valve fault detection system according to claim 2, characterized in that: The peak detection circuit includes a diode D1, a resistor R9, a capacitor C1 and an operational amplifier U1C, wherein the anode of the diode D1 is connected to the output end of the amplifier circuit, the cathode of the diode D1 is connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, the two ends of the resistor R9 are connected in parallel with the capacitor C1, the first end of the capacitor C1 is connected to the non-inverting input end of the operational amplifier U1C, the output end of the operational amplifier U1C is feedback-connected to the inverting input end of the operational amplifier U1C, and the output end of the operational amplifier U1C serves as the output end of the peak detection circuit.

5. The jigger air valve fault detection system according to claim 1, characterized in that: The comparison circuit includes a switch tube Q1 and a switch tube Q2. The first end of the switch tube Q1 is the first input end of the comparison circuit. The control end of the switch tube Q1 is the second input end of the comparison circuit. The second end of the switch tube Q1 is grounded through a resistor R2. The first end of the switch tube Q1 is connected to the first end of the switch tube Q2, the control end of the switch tube Q2 is connected to the second end of the switch tube Q1, and the second end of the switch tube Q2 is the output end of the comparison circuit.

6. The jig machine air valve fault detection system according to claim 1, characterized in that: It also includes a wind valve control circuit, which includes an optocoupler U3 and a switch tube Q3. The first input end of the optocoupler U3 is used to connect to the PWM output end of the controller, the second input end of the optocoupler U3 is grounded, the first output end of the optocoupler U3 is connected to the first power supply through a resistor R38, the second output end of the optocoupler U3 is grounded, the second output end of the optocoupler U3 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the first end of the wind valve coil, the second end of the wind valve coil is connected to the second power supply, and the second end of the switch tube Q3 is grounded.

7. The jigger air valve fault detection system according to claim 1, characterized in that: It also includes a primary alarm circuit and a secondary alarm circuit.

Images