38 results about "Automatic switching system" patented technology

The invention discloses a multi-path power source redundant power supply control method and system, and belongs to the technical field of power electronics, the system comprises a dynamic priority decision module, a zero-voltage-drop switching circuit and a fault safety framework, the dynamic priority decision module supports a user to customize a power source use priority rule through an MCU, and the zero-voltage-drop switching circuit is used for switching the zero-voltage-drop switching circuit to the fault safety framework. The MCU can autonomously carry out an automatic degradation and upgrading mechanism through voltage quality; according to the zero-voltage-drop switching circuit, when the MCU detects a fault of the main power supply, a target power supply pre-charging path is started, and when the target power supply is pre-charged until the voltage difference between the target power supply and the source voltage is smaller than or equal to 0.1 V, the target power supply GaNFET can be synchronously triggered to be switched on, and the pre-charging circuit and the original power supply GaNFET can be synchronously triggered to be switched off. The multi-path power supply input automatic switching circuit solves the problems of power-off risk, easy conduction loss and relatively high failure rate in the prior art, is suitable for a multi-path power supply input automatic switching system of a decoder and industrial control equipment, and is particularly suitable for a long-time uninterrupted power supply condition.

The invention belongs to the technical field of biological feature recognition, and discloses an automatic recognition and automatic switching system based on a multifunctional USB peripheral interface, which comprises a function module, a state detection module, a USB signal switching module and a main control module, the function module is used for accessing an external device and feeding back a voltage signal to the main control module and the state detection module; the state detection module is used for judging whether external equipment is accessed or not and judging the type of the accessed external equipment; the USB signal switching module is used for opening an internet access channel or a PC / OTG channel; the beneficial effects of the invention are as follows: 1, hardware-level channel gating is realized, software intervention is not needed, and rapid switching is realized; 2, a special detection chip is not needed, and the cost is reduced; and 3, the interface resource utilization rate is improved, and the system redundancy is reduced. And 4, three scenes of the internet access, the PC and the OTG are automatically identified, user configuration is not needed, and the compatibility is good.

The invention relates to a network spare power automatic switching rapid fault isolation and power recovery method based on a power grid dispatching control system. The power grid dispatching control system controls a power grid system, the power grid system comprises a plurality of power grid components, and the method comprises the following steps: in response to a fault in the power grid system, for each power grid component, calculating a first anomaly degree of the power grid component in a current actual fault network according to the number of associated links of the power grid component; calculating to obtain a second anomaly degree of the power grid component in the simulated fault network based on a predetermined number of associated links of the power grid component in the simulated fault network; determining an abnormal power grid component in the power grid components based on the first anomaly degree and the second anomaly degree calculated by each power grid component; and according to the simulation fault description information and the abnormal power grid component, determining an isolation component, and after the isolation component is isolated, performing power restoration on the power grid system. By adopting the method, the power grid component with the fault can be determined, and power restoration is performed after isolation, so that the power restoration efficiency is improved.

The application relates to a refrigerator automatic opening and closing system, which comprises a box body, a door body and an automatic opening and closing module. The automatic opening and closing module comprises a base, an ejection mechanism, a linkage mechanism, an intermittent gear mechanism, a clutch gear mechanism, a driving mechanism and a control mechanism. The ejection mechanism comprises an ejection rod and a first elastic component, the ejection rod is used for abutting against a position of the door body far away from a door shaft, the linkage mechanism is used for being connected with a position of the door body close to the door shaft, the intermittent gear mechanism comprises an intermittent gear, and the intermittent gear is processed with gear teeth in a circumferential direction, the intermittent gear is used for being driven with the ejection rod, and the clutch gear mechanism is used for being driven with the linkage mechanism. The power part of the application only needs one driving component and one clutch, and can complete the ejection of the refrigerator door body and the automatic opening and closing of the door, so that the structure is simple and the cost is low.

This invention discloses a priority-based intelligent control multi-power automatic switching system, belonging to the field of DC power supply management technology. The system supports 3≤N≤9 power supply paths, including N-1 conventional DC input power supply paths and 1 fixed lowest-priority battery backup power supply path. Voltage data is collected through an isolated voltage acquisition module; a power supply decision module calculates and dynamically sorts power quality assessment values ​​based on time-weighted historical cumulative voltage data, and outputs circuit control commands in conjunction with hard access verification; a switching timing control module executes seamless command switching with a duration less than the maximum power supply duration of the load capacitor; a fault locking module locks continuously faulty power supply paths with only manual reset; and a display and alarm module displays and alarms the circuit operating status. This invention significantly improves power supply reliability and enhances fault protection mechanisms, making it suitable for high-reliability DC power supply scenarios such as industrial control and medical equipment.

This invention discloses an automatic switching system, method, and drive circuit for an uninterruptible power supply (UPS) in the field of power electronics. It includes a power module for providing electrical energy to the system; a relay switch unit for controlling the switching of mains power input; an accelerated turn-off unit for accelerating the turn-off of the relay switch unit; a circuit switching unit for switching a high-current drive circuit to a low-current drive circuit after a predetermined delay; and a control module for outputting a high-level signal to control the circuit switching unit to switch the high-current drive circuit to accelerate the closing of the relay switch unit, and outputting a low-level signal to control the accelerated turn-off unit to accelerate the turn-off of the relay switch unit. This invention employs a delayed switching drive design and an accelerated turn-off unit, which significantly simplifies the power supply hardware design, reduces the power requirements of the auxiliary power module, and significantly shortens the relay turn-off time, ensuring the stability and reliability of the UPS during the switching process.

The invention discloses an electric carry-scraper battery power supply automatic switching system, and belongs to the technical field of energy storage and power supply, the electric carry-scraper battery power supply automatic switching system is provided with a storage battery pack and a switching structure, the switching structure comprises a locking cylinder and a detection circuit, a reciprocating column is arranged in the locking cylinder, switching cylinders are uniformly distributed on the lower surface of the locking cylinder, and wheel driving cylinders are arranged below the switching cylinders; a charging block and a discharging block are arranged in the wheel moving cylinder, the charging block and the discharging block can be connected with the positive electrode of a storage battery in the storage battery pack in turn through reciprocating operation of the reciprocating column in the locking cylinder, the detection circuit can detect the discharging time of the storage battery, and the storage battery in the storage battery pack meets the power supply requirement of the electric carry-scraper and also can be connected with the positive electrode of the storage battery in turn. The storage batteries in the storage battery pack can be automatically switched between charging and discharging, the operation time of the electric carry-scraper is prolonged, the charging efficiency of the storage batteries is improved, and the utilization rate of the storage batteries is increased.

The application discloses an automatic switching system and method for a pulverized coal screw conveyor of an IGCC unit, and belongs to the technical field of coal powder distribution. The system comprises a first coal grinding conveying device, a second coal grinding conveying device, a third coal grinding conveying device and a fourth conveyor. The first coal grinding conveying device comprises a first filter, a first conveyor and a first pulverized coal storage tank. The first filter is connected with the first conveyor and the fourth conveyor through a first three-way valve respectively, and the first conveyor is connected with the first pulverized coal storage tank. A second filter is connected with a second conveyor and the fourth conveyor through a second three-way valve respectively, and the second conveyor is connected with a second pulverized coal storage tank. A third filter is connected with a third conveyor and the fourth conveyor through a third three-way valve respectively, and the third conveyor is connected with a third pulverized coal storage tank. The application can effectively avoid the occurrence of personal injury and equipment damage caused by the failure of workers to find and operate in time.

The application discloses an eSIM Profile remote delivery and automatic switching system, comprising: a terminal device, used for pre-setting a seed Profile, establishing a communication session with a cloud eSIM management platform through the seed Profile, reporting location data, network state and current Profile information, and completing target Profile receiving, installation, activation and failure fallback; the cloud eSIM management platform is used for obtaining relevant call and charging characteristic data and judging whether the switching condition is met, and when the switching condition is met, the target Profile remote delivery is applied; the operator interface is used for providing relevant call and charging characteristic data to the cloud eSIM management platform, and remotely delivering the Profile; the data layer is used for storing terminal device historical performance data, and analyzing operator cost and coverage data. The application also discloses an eSIM Profile remote delivery and automatic switching method, an electronic device and a computer readable storage medium. The application improves switching accuracy and automation level, and reduces communication cost.

The utility model discloses a controller detection device and test equipment. The detection device comprises a voltage detection module, a first indication module, a main power supply and at least one standby power supply; the controller comprises at least two terminal strips; the power supply end of one terminal strip is connected with a main power supply, and the other terminal strips are connected with a standby power supply; the detection end of the voltage detection module is connected to the main power supply, the output end of the voltage detection module is connected with the control end of the terminal strip, and the voltage detection module outputs an abnormal signal when detecting that the main power supply is abnormal and transmits the abnormal signal to the control end of the terminal strip; the control end of the terminal strip is connected to a first power supply, the detection end of the terminal strip is connected with the first indication module, the controller switches a power supply according to an abnormal signal and controls the control end of the terminal strip correspondingly connected with the power supply for supplying power to be connected with the detection end, and the first indication module displays the working state of the controller. The controller detection device can detect the controller in advance, so that the fault controller is prevented from being connected to the power supply automatic switching system.

The invention provides a robot clamp automatic switching method and system and a nonvolatile storage medium, the robot clamp automatic switching method is applied to the robot clamp automatic switching system, and the robot clamp automatic switching system comprises a robot, a workbench and a plurality of clamps arranged on the workbench. The switching method comprises the steps that feature information corresponding to a plurality of clamps is obtained, a target clamp corresponding to a to-be-machined workpiece is determined according to the feature information, and the feature information comprises the model and size corresponding to each clamp; the robot is controlled to move to a target position corresponding to the target clamp, so that the tail end mounting part of the robot is in butt joint with the mounting end of the target clamp; and acquiring a gas path running state after the target clamp is butted with the robot, and determining whether the target clamp is mounted or not according to the gas path running state. The technical problems that in the related technology, positioning errors exist in the manual switching process of a traditional clamp, and an air path is not stable are solved.

The invention relates to the field of nuclear technology and automatic detection, and provides a high-precision automatic sample change detection device for mass neutron imaging experiments and an experiment method. The device comprises a sample library system and an automatic sample switching system, the sample library system can store and manage at least 200 sample boxes, and the automatic sample switching system adjusts the sample boxes to an experiment area and returns the sample boxes; the two systems work cooperatively, batch parallel processing of hundreds of samples is achieved, the problem of difficulty in automatic sample replacement of a large-batch sample experiment is solved, the experiment efficiency is improved, and the consistency and reliability of experiment data are ensured; the device runs fully automatically, experimenters are liberated, and the utilization efficiency of human resources is improved; and the device is suitable for samples of different sizes, wide in applicability, capable of improving the experiment efficiency by 70%, convenient for classified storage and management of the samples, suitable for various neutron line stations, and high in universality and economical efficiency.

The invention relates to the technical field of industrial automation equipment, and discloses a double-station direct-drive type tray automatic exchange system which comprises an architecture construction module, a cooperative control module, a track synchronization module, an interference compensation module and a maintenance management module. The framework construction module is used for establishing a driving framework comprising an embedded double-side linear motor and a double-acting cylinder, presetting reconfigurable station parameters, matching a driving mode and establishing an associated database; the cooperative control module is used for adaptively adjusting the tray through a multi-sensor array in combination with structures such as a dovetail guide rail and the like, so that closed-loop control is realized; the track synchronization module plans a driving switching strategy based on a database, and adjusts a synchronization mode according to track deviation and load difference; the interference compensation module processes vibration, temperature and other interferences, and dynamically compensates to counteract the influence; the maintenance management module monitors the equipment state and determines the maintenance level in combination with the structure wear parameters. In addition, the processing flow of visual identification and gravity center data is defined, and stable and efficient operation of the system is ensured.

The invention discloses an evaporative cooler spray gun medium automatic switching system and method. The evaporative cooler spray gun medium automatic switching system comprises an evaporative cooler and a coarse ash hopper connected to a discharging opening in the bottom of the evaporative cooler. A spray nozzle for spraying is arranged at the upper end of the evaporative cooler, and a water supply pipeline, a saturated steam pipeline and a nitrogen pipeline are connected with the spray nozzle; a water supply regulating valve, a water supply pressure gauge and a water supply flowmeter are arranged on the water supply pipeline; a total flow meter, a total pressure gauge, a steam electric stop valve, a steam pressure gauge and a steam flow meter are sequentially arranged on the saturated steam pipeline; and a nitrogen electric stop valve, a nitrogen pressure gauge and a nitrogen flow meter are sequentially arranged on the nitrogen pipeline. Steam is used for spraying water, the gas recovery concentration is improved, and the cost is reduced; nitrogen is used for spraying water, automatic spraying of the converter evaporative cooler under the condition of insufficient steam is achieved, meanwhile, it is ensured that a coarse ash system can operate normally, free switching of steam / nitrogen serving as an atomizing medium is achieved, and it is ensured that the system can operate safely, reliably and efficiently.

The invention provides a multi-power-supply automatic conversion system and method, and the system comprises a state structure module which comprises a state linked list structure, the state linked list structure is used for storing and managing a plurality of state objects in a linked list form, each state object corresponds to one power supply configuration or conversion logic in a multi-power-supply system, the state object comprises a scan method, a just method and an action method; the scheduling algorithm module is configured to recursively call a scan method of a current state object from a top layer state to traverse a sub-state chain table of the current state object; for each traversed state object, calling a Judge method of the state object to judge whether the current external condition meets a preset conversion condition or not; if yes, the action method is called to execute corresponding power switching operation. The risk of errors caused by logic modification in the later period is effectively reduced, meanwhile, the workload in the test stage is remarkably reduced, and stable and reliable operation of the system is guaranteed.

The invention provides a VCV take-up and pay-off rack automatic switching system and method, and relates to the technical field of equipment control in a high-voltage cable crosslinking process, and the system comprises a main control electric cabinet and a human-computer interaction interface; the main control electric cabinet is integrated with a dual-power switch, an intermediate relay group arranged in an M * N matrix and a PLC (Programmable Logic Controller); the man-machine interaction interface is provided with M * N groups of switching buttons and corresponding indicating lamps, and is used for operating instruction input and state monitoring; wherein the PLC realizes the dynamic matching of any VCV production line and any take-up and pay-off rack by controlling the on-off of a coil of the intermediate relay, and only allows a single production line to establish exclusive connection with a single take-up and pay-off rack. According to the invention, the PLC controls the M * N matrix relay to realize automatic switching, manual wire dismounting and wiring are replaced, and the switching time is shortened from half a day to a minute level; according to fool-proof and interlocking logic, wiring error shutdown is avoided, dual-power redundancy and manual forced switching are reliable, a reserved slot supports production line capacity expansion, and efficiency and stability are improved.

A fuel gas-fuel oil automatic switching system, comprising an electronic injection valve (1), a fuel gas control valve (2) and an engine (3); the electronic injection valve (1) is mounted on the engine (3), and the electronic injection valve (1) comprises a valve body (11), an electronic controller (12) and a fuel oil injection nozzle (13), the electronic controller (12) and the fuel oil injection nozzle (13) being arranged on the valve body (11), and the fuel oil injection nozzle (13) supplying oil to the engine (3); the fuel gas control valve (2) is communicated with the engine (3) via a pipe and supplies gas to the engine (3); the fuel gas control valve (2) is provided with a pressure sensor (21), the pressure sensor (21) being electrically connected to the electronic controller (12); the pressure sensor (21) measures the fuel gas pressure and transmitting a fuel gas pressure signal to the electronic controller (12); the electronic controller (12) automatically controls the opening and closing of the fuel gas control valve (2) and the electronic injection valve (1) on the basis of the fuel gas pressure signal. The system is used for improving the intelligence and convenience of fuel gas and fuel oil switching.

The invention discloses a charging pile multi-operator automatic switching system based on dynamic evaluation and a switching method thereof. The system comprises a communication module group, a signal monitoring module, a switching control module, a charging control module and an exception handling module. Through real-time dynamic evaluation of network quality of a plurality of communication operators, when a current communication network signal is weak or unavailable, the network can be automatically switched to other available networks, and when all communication modules are unavailable, the system automatically enters an off-network state, and a local data caching and alarm mechanism is started by an exception handling module, so that the network quality of the communication operators is ensured. According to the method, the order data is safely cached to the local, data supplementary transmission is automatically completed after the network is recovered, the service continuity is guaranteed, the problems of charging order loss, payment failure and order uploading interruption caused by network abnormity are effectively avoided, and the transaction success rate and the user satisfaction degree of the charging pile are remarkably improved.

The application discloses a kind of multi-mode coordinated ship main auxiliary power automatic switching system, it is related to ship power system technical field, including monitoring system, diagnostic decision system, execution system, switching verification system, maintenance management system and data communication system.The present weather condition of navigation is monitored by airborne weather radar, ship weather instrument and weather fax receiver, and the weather condition at future navigation route is predicted, to provide prediction basis for the operation mode of power system selected for future ship navigation, the prediction accuracy of weather data is increased by comparing the data of the two, while the ship weather instrument monitors the wind speed, wind direction, air temperature and humidity data around in real time when ship navigation, the current data is stored in data storage, form database, it is convenient for subsequent maintenance management system to predict potential danger according to historical data.

The utility model discloses a high-stability high-low pressure automatic switching system device which comprises a working table, a fixing mechanism used for fixing a machined workpiece is installed on the top of the working table, a hydraulic cylinder is installed on the fixing mechanism and connected with a hydraulic mechanism through a pipeline, the hydraulic mechanism is fixed in the working table, and the working table is connected with the hydraulic mechanism through a pipeline. A controller is installed on one side of the workbench and electrically connected with the hydraulic mechanism, the hydraulic mechanism is arranged, a plurality of assemblies of the hydraulic mechanism are used in cooperation, automatic switching of high pressure and low pressure of hydraulic pressure can be achieved through an electromagnetic unloading valve, and therefore different pressure control over the hydraulic cylinder is achieved, the stability and reliability of the system are improved, and meanwhile the working efficiency is improved. And potential quality hazards caused by unstable machining sizes due to characteristics of machined products are reduced, so that the machining quality is greatly improved, and the efficiency is improved.

The application provides a substation external emergency power supply automatic switching system reconstruction method, and relates to the technical field of power supply systems; the method comprises the following steps: constructing an emergency power supply network frame; configuring core circuit breakers as electrically operated control circuit breakers; collecting substation operation data, wherein the substation operation data at least comprises voltage data, current data, protection blocking signals and switch quantity information of collection points; determining whether the current operation state of the substation needs to start emergency power supply according to the substation operation data; when the current operation state of the substation indicates that the emergency power supply needs to be started, sending control signals to each core circuit breaker, and controlling each core circuit breaker to supply power to the secondary side bus of the substation according to the automatic switching action control logic of the control signals. The application realizes the rapid and accurate switching of the substation external emergency power supply, significantly improves the reliability and stability of the substation power supply, and effectively shortens the power outage time.

The invention discloses an AC input automatic switching system of a high-power linear power supply. The AC input automatic switching system comprises an AC power supply input unit, a voltage division sampling circuit, a comparison control unit, a switching driving unit and an RL switching circuit, the AC power supply input unit is connected with the voltage division sampling circuit, the voltage division sampling circuit is further connected with the comparison control unit, the comparison control unit is further connected with the switching driving unit, the switching driving unit is further connected with the RL switching circuit, and the AC power supply input unit is further connected with the RL switching circuit. According to the AC input automatic switching system of the high-power linear power supply, the voltage level can be automatically identified, and then automatic switching is achieved; according to the invention, two requirements of large current and automatic control can be met.

The invention discloses a laser cutting machine for metal casting machining, and relates to the technical field of laser cutting machines, the laser cutting machine for metal casting machining comprises a bottom box, the upper wall face of the bottom box is of an open structure, an upper frame is fixedly installed on the bottom box, and bearing plates are fixedly installed on the front wall face and the rear wall face outside the upper frame correspondingly. Through a double-station automatic switching system, high-precision three-axis linkage driving, a built-in safety protection mechanism, compact space optimization layout and convenient modular maintenance design, multiple targets of maximization of production efficiency, high standard of machining precision, high safety of equipment operation, low maintenance cost and the like are successfully achieved; the production capacity bottleneck and the automation problem existing in the field of laser cutting of medium and heavy metal castings in the prior art are effectively solved, and the laser cutting machine is advanced machining equipment with high efficiency, precision, safety and easy maintainability and has extremely high market popularization value and application prospects.

This invention proposes an automatic PCIe pattern switching system and method. The system includes a control module, a timer, a switching chip, a crystal oscillator module, and a PCIe device. The signal output terminal of the control module is connected to the input terminal of the timer, controlling the timer to continuously output level signals at preset intervals. The crystal oscillator module outputs differential signals at preset frequencies. The output terminals of both the timer and the crystal oscillator module are connected to the input terminal of the switching chip. The switching chip connects the differential signals at preset frequencies to the PCIe device via a connector. The PCIe device performs pattern switching based on the received differential signals at preset intervals. The preset interval is a 1ms level signal, and the differential clock signal is a 100MHz differential clock signal. Based on this system, an automatic PCIe pattern switching method is also proposed. This invention achieves automatic PCIe pattern switching in a simple and easy-to-operate manner.

The invention belongs to the field of intelligent control of high-frequency switching power supplies, and relates to an intelligent high-reliability communication power supply device. The device comprises a novel high-frequency switching power supply acquisition gateway. The novel acquisition gateway for the high-frequency switching power supply comprises a data acquisition module, an edge calculation module, a protocol conversion module, a communication module and a power supply module, according to the technical scheme provided by the invention, aiming at the defects of insufficient data acquisition dimension, lack of edge analysis capability, poor protocol compatibility and insufficient real-time performance of the existing power supply double-path switching system, the reliability of the high-frequency switching power supply for communication is improved through cooperative work of the novel acquisition gateway and the high-reliability double-power-supply automatic switching system.

The application relates to a collimator switching device and a collimator automatic switching system. The collimator switching device comprises a robot side connecting mechanism, a tool side connecting mechanism and a locking mechanism; the tool side connecting mechanism comprises a first connecting assembly and a second connecting assembly, the first connecting assembly is used for being connected with a first collimator, and the second connecting assembly is used for being connected with a second collimator; the locking mechanism comprises a locking head assembly and a locking hole, the locking head assembly is installed on the robot side connecting mechanism, the locking hole is arranged on the tool side connecting mechanism, and the locking head assembly and the locking hole are matched and used for locking and positioning the robot side connecting mechanism and the tool side connecting mechanism. The application can integrate two collimators in the same radiotherapy system, realizes seamless switching of the two collimators, overcomes the limitation of independent switching of different modules in the prior art, improves the feasibility of a mixed irradiation strategy of a complex case, and significantly improves the treatment efficiency.

The utility model relates to an automatic switching system for instrument gas, which comprises a two-position three-way electromagnetic valve, a pressure sensor and a gas source processing device, a first inlet of the two-position three-way electromagnetic valve is connected with a normal instrument gas circuit, a second inlet is connected with an emergency instrument gas circuit, and an outlet is connected with the gas source processing device. An outlet of the gas source processing device is connected to a user using end, the pressure sensor is communicated with a normal instrument gas circuit, the two-position three-way solenoid valve keeps the first inlet communicated with the outlet in a normal state, and when the pressure sensor senses that the pressure in the normal instrument gas circuit is lower than a set value, the two-position three-way solenoid valve is switched to the second inlet communicated with the outlet. Under normal conditions, a normal instrument gas circuit can continuously supply gas to a user use end; however, if the normal instrument gas circuit loses pressure due to some reasons, the pressure sensor can detect sudden pressure drop, and at the moment, the two-position three-way electromagnetic valve can switch the second inlet to be communicated with the outlet, so that the emergency instrument gas circuit can continuously supply gas to avoid danger.

The application discloses an OLT-based serial port automatic switching system and method, and relates to the technical field of communication. The system comprises a modular connector, a serial port switching control module, a CPU chip and a PON chip. The CPU chip and the PON chip are respectively connected with the serial port connection control module, and the serial port switching control module is connected with the modular connector. The CPU chip is connected with the modular connector to establish a communication connection. The CPU chip and the PON chip are provided with a baud rate. The serial port switching control module detects the baud rate of the information sent by the modular connector. According to the detected baud rate, the serial port switching control module selects the serial port of the corresponding CPU chip or PON chip to switch, and establishes a communication connection between the switched CPU chip or PON chip and the modular connector. The system and method provided by the application can realize the automatic switching of multiple serial ports and ensure the normal use of OLT equipment.

The utility model discloses a water treatment self-switching system and a heading machine, which comprise a water supply pipeline respectively communicated with a tunnel water inlet and a heading machine water inlet, and two filtering components arranged on the water supply pipeline in parallel and used for being connected with a drain outlet, the detection control assembly is arranged on the water supply pipeline, electrically connected with the two filtering assemblies respectively and used for detecting the pressure difference of the two ends of the filtering assemblies on the water supply pipeline or the water supply flow of the water supply pipeline so as to control the water flowing conditions in the two filtering assemblies respectively according to the pressure difference or the water supply flow; therefore, normal water supply or self-cleaning water supply is realized; through cooperation of the water supply pipeline, the two filtering assemblies and the detection control assembly, automatic switching of two water treatment modes of normal water supply and self-cleaning water supply is achieved, compared with the prior art, the automation degree is high, the filtering effect is good, the water supply capacity is high, the water treatment requirement of long-term operation of the heading machine can be met, practicability is high, and popularization is easy. The method is suitable for wide popularization and application.

The utility model discloses a card reader device and automatic switching system based on RS485 and Wiegand double agreement, include: card reader and circuit board, the card reader is composed by bottom shell and top shell, bottom shell and top shell are detachable connection, so as to facilitate installation or disassembly, be equipped with the accommodation cavity in bottom shell, the circuit board is located in the accommodation cavity, be equipped with screen, a plurality of buttons and card swiping area on top shell, a plurality of buttons are equidistantly arranged, and screen, a plurality of buttons and card swiping area are connected with circuit board.