Electrode type liquid level detection and control circuit for impact crusher

Abstract

The utility model discloses an electrode formula liquid level detection and control circuit for impact crusher, including electrode probe, liquid level detection circuit, photoelectric coupler isolation circuit and relay drive circuit, electrode probe is used for inserting in liquid, forms conducting path when liquid level exceeds set height, and liquid level detection circuit includes triode BG7, triode BG8, triode BG9 and LM431 reference voltage source constitution, is used for converting the liquid level signal of electrode probe into stable voltage signal, and photoelectric coupler isolation circuit includes photoelectric coupler device IC3, is used for receiving voltage signal and carries out isolated output, and relay drive circuit includes relay K3, when liquid level exceeds set height, photoelectric coupler device IC3 conduction drive relay K3 attraction, and output control signal, when liquid level is lower than set height, photoelectric coupler device IC3 cut-off, and relay K3 releases, and output signal closes, in general the utility model has simple structure, and the advantages such as high detection precision, strong environmental adaptability, high stability degree and significant cost reduction.

Description

Technical Field

[0001] This utility model belongs to the technical field of impact crusher detection circuits, specifically relating to an electrode-type liquid level detection and control circuit for impact crushers. Background Technology

[0002] During long-term operation, impact crushers rely on lubrication or hydraulic systems to ensure the normal operation of key components such as bearings and rotors. The level of lubricating oil or hydraulic oil directly affects the reliability and safety of the equipment. If the level is too low, it can easily lead to insufficient lubrication, causing bearing burnout or equipment shutdown. If the level is too high, it may cause oil overflow, affecting system stability. Therefore, real-time monitoring and automatic control of the level are of great significance.

[0003] There are two main types of liquid level detection methods for existing crushers: mechanical float detection and pressure sensor detection. Mechanical float detection is prone to jamming or failure in mining conditions with high dust and strong vibration, resulting in inaccurate liquid level information. Although pressure sensors can output electrical signals, they suffer from severe zero-point drift and poor anti-interference ability in environments with impurities in the oil and large temperature fluctuations, often producing false alarms or missed alarms, increasing maintenance difficulty and downtime risks. In addition, traditional monitoring methods mainly rely on PLCs. PLC input methods have low protection levels and insufficient reliability outside the operating temperature range of -10 to 70℃, making them unsuitable for the harsh environment of impact crusher sites with high and low temperatures and strong electromagnetic interference.

[0004] Therefore, there is an urgent need for a liquid level detection and control scheme suitable for impact crushers, which can directly determine liquid level changes using electrodes, stabilize the output of the detection signal by combining circuit design, and realize the automatic start and stop of the pump through isolation and relay drive, so as to improve detection sensitivity, anti-interference ability and overall operational stability, thereby meeting the reliable management requirements of lubrication and hydraulic systems in heavy-duty mining environments. Utility Model Content

[0005] In view of this, this utility model proposes an electrode-type liquid level detection and control circuit for impact crushers, which is applied to the field of impact crusher detection circuit technology and solves the existing technical problems of easy failure, low detection accuracy and unsuitability for harsh environments.

[0006] To achieve the above-mentioned technical objectives, the specific technical solution adopted by this utility model is as follows: An electrode-type liquid level detection and control circuit for an impact crusher includes an electrode probe, a liquid level detection circuit, an optocoupler isolation circuit, and a relay drive circuit. The electrode probe is inserted into the liquid, forming a conductive path when the liquid level exceeds a set height. The liquid level detection circuit includes transistors BG7, BG8, and BG9, and an LM431 reference voltage source, used to convert the liquid level signal generated by the electrode probe into a stable voltage signal. The optocoupler isolation circuit includes an optocoupler IC3, used to receive the voltage signal and perform isolated output. The relay drive circuit includes a relay K3. When the liquid level exceeds the set height, the optocoupler IC3 conducts, driving the relay K3 to engage and output a control signal. When the liquid level is below the set height, the optocoupler IC3 is cut off, the relay K3 is released, and the output signal is turned off.

[0007] Furthermore, a 2.5V reference voltage is connected to the input terminal of the electrode probe to ensure the sensitivity and stability of the liquid level detection.

[0008] Furthermore, the optocoupler isolation circuit uses the TLP521-1 optocoupler device to achieve electrical isolation between the liquid level detection signal and the control circuit, thereby improving anti-interference capability.

[0009] Furthermore, the relay drive circuit has a freewheeling diode D6 connected in parallel across the coil of relay K3 to suppress the back electromotive force when the relay is engaged and disengaged.

[0010] Furthermore, the output of the relay drive circuit is connected to the motor of the lubrication pump or hydraulic pump to achieve automatic start-stop control of the pump based on the liquid level.

[0011] By adopting the above technical solution, this utility model can also bring the following beneficial effects: 1. This utility model discloses an electrode-type liquid level detection and control circuit for an impact crusher. By setting up an electrode probe and a liquid level detection circuit, the liquid level signal is converted into a stable voltage signal using transistors BG7, BG8, and BG9 and an LM431 reference voltage source. A 2.5V reference voltage is connected to the electrode input terminal, which effectively improves the sensitivity and stability of the detection. Compared with traditional mechanical floats and pressure sensors, it avoids the problems of mechanical jamming and zero-point drift. It can achieve accurate and reliable liquid level monitoring under conditions of high dust, strong vibration, and complex oil impurities, and has the advantages of high detection accuracy and strong environmental adaptability.

[0012] 2. This utility model discloses an electrode-type liquid level detection and control circuit for an impact crusher. By setting up an optocoupler isolation circuit and a relay drive circuit, and using a TLP521-1 optocoupler to achieve signal isolation, the influence of strong electromagnetic interference on the main circuit is avoided. At the same time, a freewheeling diode D6 is connected in parallel across the coil of relay K3 to suppress the back electromotive force during the operation of relay K3, thereby ensuring the safety and stability of the circuit components. After the liquid level signal is processed by the optocoupler, it can directly drive relay K3 to realize the start and stop of the pump. The entire control process does not require manual intervention, the operation is reliable, and it can realize automated liquid level control in harsh environments. It has the advantages of strong anti-interference ability, stable and reliable control, and low maintenance cost. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This utility model provides a circuit diagram of an electrode-type liquid level detection and control circuit for an impact crusher. Detailed Implementation

[0015] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0016] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. This utility model can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0017] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0018] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details. Example 1

[0020] like Figure 1 As shown, an electrode-type liquid level detection and control circuit for an impact crusher includes an electrode probe, a liquid level detection circuit, an optocoupler isolation circuit, and a relay drive circuit. The liquid level detection circuit includes transistors BG7, BG8, and BG9, as well as an LM431 reference voltage source. The electrode probe is inserted into the lubricating oil or hydraulic oil tank, and its input terminal is connected to a 2.5V reference voltage. When the liquid level exceeds the set height of the dual electrodes, the electrodes are connected by the liquid. The voltage signal is processed by transistors BG7, BG8, and BG9, and then stably output by the LM431 reference voltage source, thereby converting the conductive state of the liquid level change into a stable voltage signal, ensuring sensitive and reliable detection results. The optocoupler isolation circuit uses optocoupler IC3, model number TLP521-1. The input terminal of the optocoupler isolation circuit receives the voltage signal output by the liquid level detection circuit, which is used to achieve electrical isolation between the signal and the subsequent control circuit. Optocoupler IC3 can not only prevent high voltage or strong interference signals from directly affecting the main control unit, but also accurately transmit the electrical signal corresponding to the liquid level change.

[0021] The relay drive circuit includes relay K3 and its protection components. When optocoupler IC3 is turned on, it drives relay K3 to close its output terminal, thereby starting the lubrication pump or hydraulic pump motor. When optocoupler IC3 is turned off, relay K3 is released, the output terminal is disconnected, and the motor stops. To prevent the reverse electromotive force generated during relay operation from damaging the circuit, a freewheeling diode D6 is connected in parallel across the coil of relay K3 to suppress voltage surges and protect the circuit for safe and stable operation.

[0022] In use, this invention collects liquid level signals through an electrode probe, which are then processed by transistors BG7, BG8, and BG9 and an LM431 reference voltage source to form a stable signal. This signal is then isolated and amplified by optocoupler IC3, ultimately driving relay K3 to start and stop the pump. When the liquid level exceeds the electrode height, IC3 conducts, K3 is energized, and the pump starts. When the liquid level is below the electrode height, IC3 is deactivated, K3 is released, and the pump shuts down. This completes the automated liquid level detection and control of the lubrication or hydraulic system of the impact crusher. In summary, this invention has the advantages of simple circuit structure, high detection accuracy, strong environmental adaptability, high stability, strong anti-interference ability, and significantly reduced cost.

[0023] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An electrode-type liquid level detection and control circuit for an impact crusher, characterized in that: The device includes an electrode probe, a liquid level detection circuit, an optocoupler isolation circuit, and a relay drive circuit. The electrode probe is inserted into the liquid and forms a conductive path when the liquid level exceeds a set height. The liquid level detection circuit consists of transistors BG7, BG8, and BG9 and an LM431 reference voltage source, used to convert the liquid level signal generated by the electrode probe into a stable voltage signal. The optocoupler isolation circuit includes an optocoupler IC3, used to receive the voltage signal and output it in isolation. The relay drive circuit includes a relay K3. When the liquid level exceeds the set height, the optocoupler IC3 conducts, driving the relay K3 to engage and output a control signal. When the liquid level falls below the set height, the optocoupler IC3 is turned off, the relay K3 is released, and the output signal is turned off.

2. The electrode-type liquid level detection and control circuit for an impact crusher as described in claim 1, characterized in that: The input terminal of the electrode probe is connected to a 2.5V reference voltage to ensure the sensitivity and stability of liquid level detection.

3. The electrode-type liquid level detection and control circuit for an impact crusher as described in claim 2, characterized in that: The optocoupler isolation circuit uses a TLP521-1 optocoupler to achieve electrical isolation between the liquid level detection signal and the control circuit, thereby improving anti-interference capability.

4. The electrode-type liquid level detection and control circuit for an impact crusher as described in claim 3, characterized in that: The relay drive circuit has a freewheeling diode D6 connected in parallel across the coil of relay K3 to suppress the reverse electromotive force when the relay is engaged and disengaged.

5. The electrode-type liquid level detection and control circuit for an impact crusher as described in claim 4, characterized in that: The output of the relay drive circuit is connected to the motor of the lubrication pump or hydraulic pump, and is used to realize the automatic start and stop control of the pump according to the liquid level.

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