177results about How to "Enhance perceptual knowledge" patented technology

The invention relates to a high-voltage alternative direct current transmission training simulate system, wherein the simulate server comprises a simulate module, a control protective simulate subsystem, a real-time database, an information processing subsystem, and at least one train working station; the working station sends the train operation command to the simulate server; the information processing simulate subsystem processes the train operation command and sends it to the control protective simulate subsystem to be stored in the real-time database; the pole control and station control of control and protective simulate subsystem and the direct-current protective simulate module transform the treated train operation command into the relative command and parameters to be sent to the element simulate module; the element simulate module transmits the state value and the simulate data of element to the pole control, station control and the direct current protective simulate module; the information processing subsystem processes said state value, simulate data to be sent to the real-time database to be stored and feedback to the train working station to be displayed.

The invention discloses a transesophageal echocardiography visual simulation system, comprising an intelligent phantom, a heart ultrasonic image stimulation and acquisition device, a computer connected with the heart ultrasonic image stimulation and acquisition device and a transesophageal ultrasonic probe attitude data acquisition device, wherein, the heart ultrasonic image stimulation and acquisition device is used for stimulating and acquiring heart ultrasonic images, and transmitting the acquired heart ultrasonic images to the computer; when the heat ultrasonic image stimulation and acquisition device acquires the heart ultrasonic images, the transesophageal echocardiography probe attitude data acquisition device and a sensor are used for synchronously acquiring probe attitude data of the heat ultrasonic image stimulation and acquisition device, and transmitting the acquired probe attitude data to the computer; and the computer is used for analyzing, processing and visually displaying the received heart ultrasonic images and the probe attitude data.

The invention discloses a vehicle-bridge coupling power experimental model device, and belongs to the technical field of railroad bridge engineering. The experimental model device consists of a model vehicle and a model bridge, wherein the model bridge comprises a multi-span continuous beam, a bridge pier, an acceleration section and a deceleration section. The model vehicle is processed according to the size and structure of a real vehicle. The vehicle is pulled to different positions and heights of the acceleration section by an electric motor, and then is released by power down so as to ensure that the vehicle passes through the bridge at different speeds. The deceleration section is provided with a two-stage deceleration device to consume the kinetic energy of the vehicle, and simultaneously, in order to prevent the vehicle from rebounding, the end part of the deceleration section is provided with an anti-rebounding device. By using the experimental model device, the real structures of the vehicle and the bridge can be known, and the power coupling action process between the vehicle and the bridge when the vehicle passes through the bridge can be simulated.

The invention relates to an electromagnetic environment emulation training and data management system of an extra-high voltage AC power transmission and distribution project and a method thereof. The system comprises an emulation training and data management workstation and a server. Emulation configurations in the emulation server have convenient use and mostly use graphical user interfaces; moreover, a client / server mode is utilized to establish a training emulation effect evaluation program module, a data management and analysis program module and the like of maintenance and operation personnel, and data in an information real-time database of the maintenance and operation personnel can be sent to the server for starting in real time; the training work station carries out analysis, processing, storage and graphical display on the data and requests sent by the server so as to provide a man-machine operation interface; meanwhile, a multimedia technology is adopted to simulate on-site actual operation equipment, and equipment installation use images, on-site measurement operation images and the like can be displayed, thereby enabling a learner to retrieve for examination at will. The invention is beneficial to improving the standard operation level and the accident abnormity processing ability of the operation personnel.

The invention relates to a training and assessment system for boiler stokers, in particular to a training and assessment analog machine for industrial boiler actual operations, which mainly comprises an analog model machine and a computer system. The body and the internal structure of the analog model machine are lessened in proportion to the actual boiler; a plurality of operable components and a signal acquisition device can be arranged on the control point of training and assessment on the machine body, the operable component transmits control point signals, which are acquired by the signal acquisition system, converted by a control system and transmitted to the computer system. The invention highlights the analog machine for industrial boiler troubleshooting operations and emergency handling capability (training) assessment; the analog machine accomplishes the assessment for the emergency handling and troubleshooting capability in case of boiler faults, owns a set of test question library covering the safety accessory operation, load adjusting operation and troubleshooting operations; moreover, the analog machine comprises a dedicated training software fitted with the test questions; the software can control the control point on the analog machine to display relevant states, and receive the signals fed back from the analog machine to conduct corresponding processing. The invention has the advantages that: the software fulfills the function of freely extending the test questions, which can be operated directly on the analog machine for assessment.

The invention discloses a combined type multifunctional coal mine production technology control program development practical training platform. The practical training platform includes a pedestal, a practical training panel and a control panel are arranged on the pedestal, the left side of the practical training panel is provided with a power supply unit, the right side of the practical training panel is provided with a hanging mechanism used for hanging a programmable controller, and an analog quantity circuit, a position / rotating speed pulse signal generator, a switching value input circuit and an actuator circuit are arranged under the control panel. The combined type multifunctional coal mine production technology control program development practical training platform adopts a removable modularization mode, according to the actual requirements of teaching or scientific research, satisfies practical training requirements of various programmable controllers, and flexibly assembles various practical training hardware, in order to reduce occupied space of practical training equipment, reduce equipment cost, and enhances perceptual knowledge of the programmable controller and actual wiring training of a student, thereby satisfying requirements for concentrated training or of a large-scale technical contest.

The invention relates to a mechanical balance experiment instrument which comprises a supporting mechanism, a power mechanism and a balance adjusting mechanism. The supporting mechanism comprises a base, fixed supporting rods arranged at the two ends of the base and a lengthening plate arranged at one end of the base. Supporting rods are arranged at the upper ends of the fixed supporting rods in a matched mode. The power mechanism comprises a motor, a reduction gear device, a rotary main shaft and a short shaft. The balance adjusting mechanism comprises a vectorial resultant balance mechanism, a vibration display mechanism, a stiffness and resilient mounting and switching mechanism and a tray lifting mechanism. The vibration of the rotary main shaft is amplified, the amplitude of the vibration can be judged according to the position of a light spot emitted by a laser pen on a screen, and therefore the visualization of microvibration is achieved. A standard mass block is moved, the position of a chuck body is changed, a dynamic balance principle experiment can be changed from a single replication experiment into a design experiment, the hands-on practice capacity of students can be trained greatly, and the perceptual knowledge of the students is improved.

The invention discloses a digital experimental system based on a universal serial bus (USB) and a virtual instrument. The digital experimental system comprises a computer, a digital circuit experimental instrument module and an experimental chip, wherein the computer and the digital circuit experimental instrument module communicate through a USB port signal line and supply power to a digital circuit experimental instrument system and the experimental chip through a USB port of the computer; and a connecting line between the digital circuit experimental instrument module and the experimental chip is a standard C2 self-locking connector. By employing the digital experimental system based on the USB and the virtual instrument, a microcomputer serves as the basis, an integrated test platform is constructed, a conventional instrument is replaced, the requirements of electrician and electronic experiment teaching are met, the microcomputers can serve as computers for other computer course teaching, the equipment utilization rate is greatly improved, the resource sharing is realized, the experimental construction cost is reduced, and due to the introduction of the virtual instrument, an experimental teaching mode of combining the actual operation and the computer simulation is determined.

The invention provides a high-pressure discharging device, comprising a low voltage power supply, two electrode wires, a rotating plate, a base and a power switch, and further comprising an electronic booster, wherein, the low voltage power supply is connected with the electronic booster and is connected onto the two electrodes through wires; the two electrodes are respectively fixed on the two rotating plates which are fixed on a shell of the base; the low voltage power supply and the electronic booster are installed in a cavity of the base; the power switch is fixed on the shell body of the base shell. The invention further provides eight use methods of the high-pressure discharging device.

The invention discloses a teaching drawing tool, and particularly relates to a curve drawing and measuring tool. By adoption of the tool, parabolas, hyperbolic curves, ellipses, circles and other curves can be conveniently and fast drawn, the length of the curves can be measured, a vacancy in the field of teaching tools is filled, and the problem that junior-senior high school students and teachers have no tools to draw the curves is solved. According to the technical scheme, based on the basic principle of a five-point parabola drawing method, a strip-shaped ultrathin stainless steel sheet is made into an elastic stainless steel dividing ruler, and the stainless steel dividing ruler is smoothly bent into a required parabola shape, and then the pattern of the parabola is drawn along the outer side of the stainless steel dividing ruler. The technical scheme can also be used for drawing the hyperbolic curves, ellipses, circles and other curves. Since the two sides of the stainless steel dividing ruler have scales, the length of a drawn curve can be directly read. The tool further has the functions of a traditional protractor and straightedge, and can be used for drawing any geometric figures. The drawing tool is absent in current domestic and overseas markets, and is wide in market prospect.

The invention relates to a momentum swing which is composed of swing ropes (4), a swing board (5), a support, a rail car (1), a sandpit, sand and a telescopic board. The sandpit is formed in the ground below the swing board (5) and filled with the sand, and safety is remarkably improved compared with that of a traditional swing. The upper ends of the swing ropes (4) move along with the rail car (1), the rail car (1) has multiple motion modes, and the swing has more enjoyment and thrill and the larger exercise amount compared with the traditional swing and has relatively large attraction to middle-aged and young people. The momentum swing contains rich physical content and shows colorful physical models, and in motion, the swing participates in the complex physical process, stimulates scientific interest, improves perceptual knowledge of physical phenomena, lays a foundation for sublimating perceptual knowledge into rational cognition and creates conditions for improving the scientific quality of citizens.

The invention provides a well-cementing operation simulation training system, which comprises a double-engine double-pump mortar mixing sledge, an air compressor sledge, a vertical lime discharging tank, a pressure balancing tank, a cementing head and wellhead device, and a simulation control module, wherein the double-engine double-pump mortar mixing sledge comprises engines, gear boxes, a plunger pump, a sledge seat, a tank body and high and low pressure manifolds; the tank body is connected to the sledge seat; the engines, the gear boxes and the plunger pump are sequentially connected; the air compressor sledge comprises a sledge frame, an air compressor, an air storage tank and a freeze-drying machine; the air storage tank, the air compressor and the freeze-drying machine are sequentially connected, and are arranged on the sledge frame; the cementing head and wellhead device comprises a simulated cementing head structure and a simulated wellhead device; and the simulation control module acquires and simulates the information of the double-engine double-pump mortar mixing sledge, the air compressor sledge, the vertical lime discharging tank, the pressure balancing tank and the cementing head and wellhead device, and feeds the information back. By adopting the double-engine double-pump mortar mixing sledge, the air compressor sledge, the vertical lime discharging tank, the pressure balancing tank, the cementing head and wellhead device and the simulation control module, the well-cementing operation simulation training system can completely simulate a well cementing operation process and fault processing and bring convenience to trainees to master well cementing operation and fault processing processes in all aspects, along with extremely high practicability.

The invention relates to the field of safe production, in particular to a device for simulating high-altitude falling hitting. The device comprises an electric telescopic rod fixed to one end of a transverse rod, a pneumatic grasper is fixed to the other end of the transverse rod and grasps a steel ball, a cylinder is disposed on the transverse rod, a testing table is arranged below the steel ball and provided with a display screen and a head model, the head model is sleeved with a safety helmet, a pressure sensor is disposed between the safety helmet and the head model, and a controller is arranged on the electric telescopic rod. By means of the technical scheme, the defect that in the prior art, trainees cannot visually and truly experience harm of high-altitude falling hitting can be effectively overcome.

The invention relates to a dynamic collision experiment device. A punched spring and a pressure bearing plate are fixedly connected onto a vertical plate at the lower end of a slope railroad shoe, a laser sensor is installed behind the vertical plate, a laser beam of the laser sensor penetrates a through hole in the vertical plate of the slope railroad shoe to the center of the pressure bearing plate, a trolley is arranged at the upper end of the slope railroad shoe, a barrel is arranged in the trolley, a front baffle and a rear end cover are fixedly connected at the front end and the rear end of the trolley in a sealing mode, the trolley is filled with a liquid medium, the front baffle and the outer end face of the barrel are fixedly connected in a sealing mode, a punch rod and a movable piston are arranged in the barrel, an inner hole of the movable piston is connected with the punch rod in a matching mode, the barrel is divided into a front cavity and a rear cavity through the movable piston, a leakage flow hole is formed in a tail cover at the rear end of the rear cavity, the front end of the punch rod is connected with the through hole in the front baffle in a matching mode and in a sealing mode, a main spring is installed on the step cylindrical face of the punch rod and the step cylindrical face of the movable piston, a restoring spring is installed on the rear end step of the movable piston and the rear end face of the tail cover, and the tail cover and the barrel are fixedly connected in a sealing mode.

The invention relates to a portable machining and observation integrated micro-miniature numerical control electric erosion machining machine tool, belongs to the field of numerical control machine tools and aims at solving the problems that the size of the existing electric erosion machining machine tool is large and the existing electric erosion machining machine tool cannot be used for field video teaching demonstration. The portable machining and observation integrated micro-miniature numerical control electric erosion machining machine tool comprises a micro-miniature machine tool body structure, a servo feeding mechanism, a servo actuating mechanism, an elastic element and an electric control box, wherein the micro-miniature machine tool body structure comprises a portable light-weight transverse beam, a stand column, a workbench, a working fluid tank, a guide rail and a sliding block; the servo feeding mechanism comprises a linear stepping motor and a non-rigid connecting bulb; the servo actuating mechanism comprises a rotating motor, an electrode chuck and a rotating motor fixing rack; the electric control box is used for providing pulse voltage to the electrode chuck, detecting interpolar voltage between an electrode clamped by the electrode chuck and a device to be machined in the working fluid tank and controlling the linear stepping motor. The portable machining and observation integrated micro-miniature numerical control electric erosion machining machine tool is used in the electric machining field.

The invention relates to a virtuality and reality combined electrical control simulation system for a crane. The system mainly comprises a physical circuit, a virtual circuit and an interaction system, wherein the physical circuit mainly is a road physical circuit arranged by simulating an actual mechanism and has the main function of being responsible for reproducing due electrical action of a certain mechanism of the crane simulated in a simulation trainer; the perceptual knowledge of a student is reinforced. The virtual circuit mainly comprises a circuit simulated by PC software, a simulated instrument display screen and relevant electric appliance cabinet servers, the virtual circuit mainly serves as a supplement of the physical circuit, the cost required for the physical circuit is reduced, the fault rate is reduced, corresponding electrical action is simulated through the virtual circuit, and feedback deserved for operation of the student is given. The interaction system comprises a teacher end control system, an electrical system fault setting system, a physical linkage table and a virtual visual system. Multiple purposes of a machine are achieved, the cost of simulation equipment is reduced, updating and upgrading are convenient, and the perceptual knowledge of the student is reinforced.

The invention discloses an analog simulation system for steel rolling skill training and assessment, comprising an operating platform connected with a micro-computer system which is provided with a steel rolling analog simulation device. The steel rolling analog simulation device comprises a model computer module, a technical process display module, a data acquisition module and a monitoring display module. The model computer module receives control signals input by the operating platform, carries out calculation and generates process data corresponding to virtual production. The data acquisition module carries out real-time acquisition of the site data generated in the steel rolling process, converts the site data into digital signals after amplification, isolation and filtration and transmits the digital signals to an upper layer through a computer network. The monitoring display module receives the digital signals transmitted by the data acquisition module, adopts a PIC automation program to simulate the monitoring system of a real company, operates and monitors the full simulation of an interface and transmits the obtained key information to a virtual display module for display.

The invention discloses a free vibration experiment device, and relates to the technical field of vibration experiment equipment. The experimental device comprises a bracket, a vibrating rod, a mass block and an electromagnetic positioning and releasing device; at least one vibration rod is detachably connected with the support, at least one mass block is detachably connected with the vibration rod, and at least one set of electromagnetic positioning and releasing device is matched with the mass block. According to the free vibration experiment device disclosed by the invention, various different structural dynamics free vibration teaching demonstration experiments can be completed by adjusting the number or shapes of the vibration rods and the mass blocks, so that the perceptual knowledgeof students on free vibration is increased; meanwhile, the electromagnetic positioning and releasing device is arranged, the characteristic that attraction force is generated after the electromagnetis powered on and disappears at the same time after the electromagnet is powered off is utilized, the initial displacement of each mass block deviating from the balance position is accurately set, itis guaranteed that each mass block is released at the self-deviating position at the same time, and the accuracy of experiment results is improved.

The invention discloses an electromechanical transmission control system and control method, and relates to the technical field of mechanical automatic control. According to the system, a system maincircuit firstly connects an external power supply with a main power supply circuit breaker, and a servo power supply circuit breaker controls the on-off of a high-voltage circuit; a servo control circuit controls a servo motor to move; a variable-frequency speed regulation circuit controls the rotating speed of an alternating-current motor through an analog quantity output signal of a Beckhoff controller; a Beckhoff controller circuit controls logic control of a servo driver and a frequency converter through digital signals and analog signals; and a PLC control circuit controls a proximity switch on a door to carry out safety protection and is connected with the lead wire of the system power supply circuit breaker and the proximity sensor of the servo control circuit to form a loop. According to the invention, a PLC program is written additionally, so that the motor can realize logic control and a variable-frequency speed regulation system, a man-machine interaction interface is drawn,an electrical wiring principle and a control principle of an electric control system are provided, and the practicability of the system is enhanced.

The invention relates to a demonstration device generating visual illusion, which consists of an experiment table, a head fixing device, a cylinder, a 'palm' model, a 'coin' model, two mobile devices and a special guide rail used for the motion of the mobile devices, wherein the head fixing device is fixed at one end of the experiment table; the guide rail is fixed at the other end of the experiment table and is parallel with the head fixing device, and the two mobile devices are arranged on the guide rail and can move along the guide rail freely; the cylinder is fixed on one of the mobile devices; the 'palm' model is fixed on the other mobile device; and the 'coin' model can be adsorbed on the 'palm' model. When the demonstration device is used, the left eye of a user can stare at an object about 5 meters away from the user through the cylinder, the 'palm' model is moved close to the cylinder slowly from the right side, the user can observe that a 'hole' appears on the palm of the 'palm' model; and from the 'hole', the object stared by the user can be seen.

The invention relates to an indexable type micro multifunctional numerical control machine; wherein, a main motor, a driving wheel, a main spindle box and a chuck are sequentially connected; the main spindle box and a main spindle box base are fixedly connected; a sliding upright column, a round rotary table, a spacing guiding sliding block and a sliding guiding rail are arranged in inner cavity of a horizontal type bed body and can be translated from left to right; an end of the round rotary table is articulated with the spacing guiding sliding block and the other end is connected with the sliding upright column which is externally fixedly connected with the sliding guiding rail; the main spindle box base is fixedly connected with the upper surface of the sliding guiding rail; the sliding upright column is internally provided with a lead screw which is connected with a lead screw feed motor; a locking block is arranged along left end of the guiding rail of the bed body and a limit switch is arranged at the left end part of the guiding rail of the bed body; a bed body step is equipped at the bottom of the bed body at the left end; an inner cavity locating groove is arranged at the bottom of the horizontal type bed body; the horizontal type vehicle main spindle box base is locked with a horizontal vehicle body by a locking device; the spacing guiding sliding block, etc. are translated to the left along the inner cavity of the horizontal type bed body and rotate clockwise with 90 degrees around an articulated pivot of the round rotary table and the spacing guiding sliding block, thus showing a vertical milling numerical control machine. The indexable type micro multifunctional numerical control machine has the advantages of small volume and wide use.

The present invention discloses a single-degree-of-freedom vibration test device which comprises a damper, a wobble plate, a torsion spring, a stepper motor, a pair of measuring light eyes, an indicating pointer, an excitation pointer, a connection rod, push pins, and a fixed bracket. Measurement concave teeth are uniformly distributed on the wobble plate in a ring. One end of the torsion spring is connected to the wobble plate, and the other end is connected to the excitation pointer. The damper is a U-shaped structure and comprises a flat plate part and two extending part which are formed by extending from two ends of the flat plate part. The flat plate part can rotate freely, and the two extending parts are above and under the wobble plate. The stepper motor is connected to the excitation pointer. A pair of measuring light eyes is at two sides of the wobble plate, and the beams of the measuring light eyes can detect the concave teeth on the wobble plate. The indicating pointer is installed on the wobble plate. The wobble plate, the connection rod and the torsion spring are integratedly fixed to the axis eye of the fixed bracket through upper and lower push pins. A magnetic steel is pasted to the damper, and the area of the wobble plate included in the damper and the magnitude of damping are changed through adjusting the position of the damper.

The invention relates to an electric precipitation experimental demonstrational instrument and an experimental demonstration method thereof, the instrument comprises a box body part, an electric system and a dedusting system; the box body part comprises a bottom opened insulating box body, a horizontal metal shaft which is arranged on the front part of the box body across wall plates on two sides of the box body, rollers arranged on two ends of the shaft and a handle arranged on the box body; the electric system adopts 220V, 50Hz AC power supply and comprises a boosting transformer, a rectifier and a silicon steel sheet which are arranged on the rear part of the box body and a switch and a connecting plug which are arranged on the box body; the dedusting system comprises a cylindric metal anode sleeved on the shaft, two rows of hackle-shaped metal cathodes which are fixed to copper sheets and oppositely arranged on front and rear sides of the anode, a wire which is used for connecting two copper sheets, a sponge wiper which is arranged above the metal anode and dust collecting grooves which are arranged on two sides of the metal anode; the rectified voltage output anode is connected with the metal shaft through an electric brush, and a cathode is connected with two copper sheets. According to the invention, the operation is convenient, teaching demonstration can be directly performed, and the instrument helps students to deepen perceptual knowledge for point discharge phenomenon.

The invention discloses a diversified thermal power operation simulation operating skill training method, comprising a DCS operating module and a local operating module. The method comprises the following steps of: (1) adding a set of perfect teaching courseware in the DCS operating module; (2) adding local detection and operating items for accident treatment in the local operating module. The method has the following benefits that: (1) by adding the teaching courseware in the DCS operating module, learners can acquire theoretical knowledge related to the operation while practicing the operation, teaching content of thermal power operation operating skill training is greatly enriched, and perceptual knowledge of the learners to devices is enhanced; (2) by adding corresponding device accident video file, audio file and picture file in the local operating module, reality of simulation software in the local operating module in the thermal power operation operating skill training is improved, and further understanding of the learners to accident treatment for thermal power operation related devices is strengthened.

The invention relates to a portable multifunctional heat transfer experiment table and belongs to the field of heat transfer experiment teaching. An experimental apparatus comprises an outer box and support, a cover plate, insulation foam, a vacuum cover, a vacuum cover loop, long bolts, short bolts, a clamp plate, a PTC (positive temperature coefficient) constant-temperature heating block, a measuring block, a water-cooling head, bolt caps, thermocouples, a left aluminum block, and a right aluminum block; The outer box and support comprises a box body, a support, radiating fins, a cooling fan, a water pump and a display apparatus; the thermocouples are disposed at various positions to measure temperature; the PTC constant-temperature heating block is electrified to generate heat, the heat is finally transferred to the water-cooling head, the water-cooling head, the radiating fins, the cooling fan and the water pump function in enhanced heat dissipation, and thus heat dissipation and continuous transfer of the heat are achieved. Compared with the prior art, the portable multifunctional heat transfer experiment table is ingenious in structure, easy to operate and carry and available for various heat transfer experiments, and the problem that a traditional experimental apparatus is difficult to carry, has single function, and is poor in output effect is solved.

A test device of detecting-sorting-conveying automatic line consists of measuring and controlling unit, base seat, guide mechanism, sort mechanism, conveyance mechanism, multiple simulation work piece, multiple measuring and controlling component. It is feature as placing simulation work piece on said automatic line, sending said work piece to detection position for being detected and confirming step number of moving said work piece by measuring and controlling unit according to sort of work piece, starting sort mechanism to classify out type of said work piece then pushing said work piece on conveyance line for realizing detection-sort-conveyance on simulation work piece.

The invention discloses a demonstration device for generating Poggendorff illusion, comprising a test board, a demonstration module and a laser. A parallel line set formed by four to six inclined line segments is arranged at the right lower part of the front surface of the test board; the demonstration module can be fixed at the left upper part of the test board, and the angle and the up-and-down position of the demonstration module can be regulated to enable the demonstration module to be arranged in the same line with any one line segment in the parallel line set; and the laser is fixed at the front end of the demonstration module. When the demonstration device is used, the front surface of the test board is displayed to an observer, and the angle and the up-and-down position of the demonstration module are regulated to enable the observer to feel and determine which line segment in the parallel line set at the right lower part is in the same line with the demonstration module; and the laser is started, the observer observes that lasers passes through the line to verify a fact.

The invention relates to the field of safe production, in particular to a device for comprehensively simulating danger of electricity. The device comprises a first cement rod and a second cement rod. A first installation plate is fixed on the top of the first cement rod. A voltage regulator and a transformer are arranged on the first installation plate. A cross arm is fixed on each of the first cement rod and the second cement rod. The voltage regulator, the transformer and the cross arms are connected with each other through wires. An object placing ring is fixed on the side face of the first cement rod. An insulation operation rod is inserted in the object placing ring. A second installation plate is fixed on the top of the second cement rod. An isolation switch and a grounding knife switch are arranged on the second installation plate. A transverse rod and an object placing plate are fixed on the side face of the second cement rod. A projector and a loudspeaker box are arranged on the object placing plate. A warning lamp and a branch wire are arranged on one of the wires. A support rod and a simulation ground are arranged between the first cement rod and the second cement rod. According to the invention, a disadvantage of failure to allow trained learners to directly and truly realize single-phase grounding danger of closing the isolation switch, the grounding knife switch and the circuit in an electrified manner can be overcome.

The invention discloses a demonstration device for generating a Cheshire cat optical illusion, comprising an experiment table, a plane mirror, an observation model, a background board, light-emitting diodes and a switch. The plane mirror, the background board and the switch are fixed on the experiment table, and the plane mirror can regulate an angle around a fixed shaft; the observation model can be fixed at any position of the experiment table through a sucking disc; the light-emitting diodes are arranged in a cycle of circular ring on the background board; the switch controls starting and stopping of the light-emitting diodes; and the ground color of the background board is white. The circle centers of circular rings formed by the plane mirror, the observation model and the light-emitting diodes are approximately arranged on the same horizontal line. When the demonstration device is used, an observer sits before the experiment table to enable the right eye to just see reflection of the background board and the left eye to see to about 60 cm at the front side to observe a puppy model at the same time; the switch is started, the light-emitting diodes, which form the circular ring sequentially, flash on and off along the counterclockwise direction, and after a while, the puppy model disappears from sight of the observer.