Protective isolation fence for electrical system of coal mining machine
By introducing a protective isolation barrier into the shearer electrical system and using optocouplers for signal isolation, the problem of controller damage was solved and the system reliability and uptime were improved.
Patent Information
- Application Number
- CN202422465056.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-12
AI Technical Summary
The lack of signal isolation in the shearer electrical system caused damage to the controller, affecting system reliability and overall machine uptime.
A protective isolation barrier is used, including input modules and output modules, and photocouplers PH1 and PH2 are used for signal isolation to prevent current connection between the low-voltage control circuit and the high-voltage circuit, enhance the common-mode suppression capability, and improve the signal-to-noise ratio.
It improves the working reliability of the coal mining machine controller and the running time of the whole machine, reduces the damage rate of the controller and improves the stability of the system.
Smart Images
Figure CN223391092U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electrical safety protection for coal mining machines, in particular to a protective isolation fence for an electrical system of a coal mining machine. Background Art
[0002] The shearer electrical system is the control center of the shearer, and includes a master controller and a slave controller.
[0003] The DCSM100 is a coal mining machine electrical system that adopts a distributed control method. The master controller serves as the control core and is responsible for data processing and logic control of the coal mining machine. The slave controller is responsible for controlling the power on and off of the cutting motor, oil pump motor, crushing motor, and the entire machine, and collecting status data such as motor temperature and current. Data communication between the two controllers is carried out through the CAN bus. The master and slave control devices are imported STW controllers, which have the characteristics of fast data processing speed and high reliability.
[0004] After multiple repairs on the DCSM100 system shearer and collecting feedback from users, the DCSM100 system has the following problems:
[0005] Since the coal mining machine and the coal mining machine controller are directly connected, the input and output signals are not isolated, causing damage to the controller. Summary of the Invention
[0006] In view of the above situation, the purpose of the utility model is to provide a protective isolation fence for the electrical system of a coal shearer, which reduces the damage rate of the coal shearer controller and qualitatively improves the quality of the entire coal shearer.
[0007] The technical solution of the utility model is as follows: a protective isolation fence of a coal mining machine electrical system, comprising an input module and an output module;
[0008] The input module includes an operational amplifier A1, photoelectric couplers PH1 and PH2, the non-inverting input terminal of the operational amplifier A1 is connected to the negative electrode of the power supply through a resistor R2, the inverting input terminal is divided into two paths, one path is connected to the control button terminal of the coal mining machine through a resistor Ri, and the other path is connected to the output terminal of the operational amplifier A1 through a capacitor C1, the output terminal of the operational amplifier A1 is connected to the cathode of the photoelectric coupler PH2, the anode of the photoelectric coupler PH2 is connected to the cathode of the photoelectric coupler PH1, the anode of the photoelectric coupler PH1 is connected to the negative electrode of the power supply through a resistor R3, the collector of the photoelectric coupler PH1 is connected to the inverting input terminal of the operational amplifier A1, and the emitter is connected to the power supply -10V;
[0009] The output module includes an operational amplifier A2, the non-inverting input terminal of the operational amplifier A2 is grounded through a resistor R7, the inverting input terminal is divided into two paths, one path is connected to the collector of the photoelectric coupler PH2, and the other path is connected to the output terminal of the operational amplifier A2 through a resistor R5. The resistor R6 is connected in series with the capacitor C2 and then connected in parallel with the resistor R5. The output terminal of the operational amplifier A2 is connected to the coal mining machine controller.
[0010] Preferably, the resistor Ri and the operational amplifier A1 are connected to a power supply +10V via a pull-up resistor R1.
[0011] Preferably, the inverting input terminal of the operational amplifier A2 is connected to the power supply +10V through a pull-up resistor R4.
[0012] The utility model provides a protective isolation fence for the electrical system of a coal mining machine, which is connected between the control button end of the electrical system of the coal mining machine and the coal mining machine controller. Optocouplers PH1 and PH2 are used, and there is no direct current connection between the input module and the output module. This prevents interference of the coal mining machine controller caused by the current connection between the low-voltage control circuit and the external high-voltage circuit. Since the input ends of the optocouplers PH1 and PH2 are low-resistance elements working in the current type, they have strong common-mode suppression capabilities. Therefore, they can greatly improve the signal-to-noise ratio as terminal isolation elements in long-distance information transmission. In digital communication and real-time control, the isolation fence serves as an interface device for signal isolation, which can greatly increase the reliability of the coal mining machine controller, thereby improving the overall operating time of the coal mining machine. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the isolation fence of the utility model. DETAILED DESCRIPTION
[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical personnel in this field without making creative efforts shall fall within the scope of protection of the present invention.
[0015] See also Figure 1 , a protective isolation fence for a coal mining machine electrical system, including an input module and an output module;
[0016] The input module includes an operational amplifier A1, photocouplers PH1 and PH2. The non-inverting input terminal of the operational amplifier A1 is connected to the negative pole of the power supply through a resistor R2. The inverting input terminal is divided into two paths, one path is connected to the control button terminal of the coal mining machine through a resistor Ri, and the other path is connected to the output terminal of the operational amplifier A1 through a capacitor C1. The output terminal of the operational amplifier A1 is connected to the cathode of the photocoupler PH2, the anode of the photocoupler PH2 is connected to the cathode of the photocoupler PH1, the anode of the photocoupler PH1 is connected to the negative pole of the power supply through a resistor R3, the collector of the photocoupler PH1 is connected to the inverting input terminal of the operational amplifier A1, and the emitter is connected to the power supply -10V. The resistor Ri and the operational amplifier A1 are connected to the power supply +10V through a pull-up resistor R1.
[0017] The output module includes an operational amplifier A2. The non-inverting input terminal of the operational amplifier A2 is grounded through a resistor R7. The inverting input terminal is divided into two paths, one is connected to the collector of the photoelectric coupler PH2, and the other is connected to the output terminal of the operational amplifier A2 through a resistor R5. The resistor R6 is connected in series with the capacitor C2 and then connected in parallel with the resistor R5. The output terminal of the operational amplifier A2 is connected to the coal mining machine controller, and the inverting input terminal of the operational amplifier A2 is connected to the power supply +10V through a pull-up resistor R4.
[0018] During specific implementation, the isolation barrier of the present application is connected between the control button end of the coal mining machine and the controller of the coal mining machine. The isolation barrier adopts optocouplers PH1 and PH2. There is no direct current connection between the input module and the output module, which prevents the interference of the coal mining machine controller caused by the current connection between the low-voltage control circuit and the external high-voltage circuit. Since the input ends of the optocouplers PH1 and PH2 are low-resistance elements working in the current type, they have strong common-mode suppression capabilities. Therefore, it can greatly improve the signal-to-noise ratio as a terminal isolation element in long-distance information transmission. In digital communication and real-time control, the isolation barrier serves as an interface device for signal isolation, which can greatly increase the reliability of the coal mining machine controller.
[0019] The resistor Ri, capacitor C1 and operational amplifier A1 of the present application form an input integration circuit to eliminate the integral compensation in the control. R1 is a current limiting resistor, and R2 is a balancing resistor that can reduce the voltage offset caused by the input bias current. The resistor R5, resistor R6 and capacitor C2 form an output integration circuit to eliminate the integral compensation in the control. The addition of resistor R6 makes the output signal more stable.
Claims
1. A protective isolation fence for a coal mining machine electrical system, characterized in that: Includes input module and output module; The input module includes an operational amplifier A1, photoelectric couplers PH1 and PH2, the non-inverting input terminal of the operational amplifier A1 is connected to the negative electrode of the power supply through a resistor R2, the inverting input terminal is divided into two paths, one path is connected to the control button terminal of the coal mining machine through a resistor Ri, and the other path is connected to the output terminal of the operational amplifier A1 through a capacitor C1, the output terminal of the operational amplifier A1 is connected to the cathode of the photoelectric coupler PH2, the anode of the photoelectric coupler PH2 is connected to the cathode of the photoelectric coupler PH1, the anode of the photoelectric coupler PH1 is connected to the negative electrode of the power supply through a resistor R3, the collector of the photoelectric coupler PH1 is connected to the inverting input terminal of the operational amplifier A1, and the emitter is connected to the power supply -10V; The output module includes an operational amplifier A2. The non-inverting input terminal of the operational amplifier A2 is grounded through a resistor R7. The inverting input terminal is divided into two paths, one of which is connected to the collector of the photoelectric coupler PH2, and the other is connected to the output terminal of the operational amplifier A2 through a resistor R5. The resistor R6 is connected in series with the capacitor C2 and then in parallel with the resistor R5. The output terminal of the operational amplifier A2 is connected to the coal mining machine controller.
2. The protective isolation fence of the coal mining machine electrical system according to claim 1, characterized in that: The resistor Ri and the operational amplifier A1 are connected to a power supply +10V via a pull-up resistor R1.
3. The protective isolation fence of the coal mining machine electrical system according to claim 1, characterized in that: The inverting input terminal of the operational amplifier A2 is connected to the power supply +10V via a pull-up resistor R4.