91results about How to "Realize environmental protection and energy saving" patented technology

The invention discloses a combined building structure and an installation method. The building structure comprises first keels, second keels and interlayer modules and further comprises more than two fixing shafts and locking members arranged at two ends of the fixing shafts, wherein each first keel is provided with more than two opposite side walls vertically penetrating through the first keel and first through holes matched with the fixing shaft; each second keel is only provided with a second through hole, which is matched with the fixing shaft and penetrates through two end parts of the second keel; more than two parallel second keels are arranged between every two adjacent first keels, the fixing shafts penetrate through the first through holes of the first keels, then penetrate through the second through holes of the second keels and the first through holes of the first keels in sequence more than two times, and finally are used for locking and installing the first keels and the second keels together through the locking members arranged at two ends of the fixing shafts; and the locking members are accommodated in the corresponding first keels. The combined building structure has the advantages of simple structure, simplicity and convenience for installation, reliability for fixation, good rigidity and strength and more attractive appearance.

The present invention relates to a solar composite energy system based on solid adsorption refrigerating machine in the energy-saving field. Said system includes solar collection system, solar hot water supply system, solar floor heating system, solar air-conditioning system, solar natural ventilation system and control system.

The invention provides a water-flushing-free closestool and an excreta automatic collecting system. The water-flushing-free closestool comprises a closestool body, a collecting bag storage device, an intelligent controller (1) and a packing / sealing machine. The excreta automatic collecting system comprises a management center, a collecting pipeline, an intelligent collecting box and sensors, wherein the intelligent collecting box is connected with the collecting pipeline; the sensors are mounted in the collecting pipeline and the intelligent collecting box; the collecting pipeline and the intelligent collecting box are connected with the management center in a wireless communication manner through the sensors. Due to the implementation of the water-flushing-free closestool and the excreta automatic collecting system, energy and water resources consumed by excrement pollution discharge are saved, and thus energy conservation and environmental protection are achieved. According to the invention, the conveying pipelines of the whole area can be interweaved and interconnected together for conveying excrement bags to a designated place, the functions of whole-course monitoring, early warning prompt and the like are also available, the digital and intelligent management is realized, and the effects of environmental protection, energy conservation, high efficiency and convenience are achieved.

The invention relates to a polypropylene material and a preparation method thereof, especially to a polypropylene micro-foamed material with high surface quality and a preparation method thereof, belonging to the technical field of high-molecular materials. The polypropylene micro-foamed material comprises the following raw materials by weight: 50 to 80 parts of polypropylene, 10 to 40 parts of inorganic powder, 3 to 10 parts of a micro-foaming adjusting auxiliary agent, 0.5 to 5 parts of a foaming agent and 0.2 to 2 parts of an anti-oxidant. Through the micro-foaming adjusting auxiliary agent, surface quality of the polypropylene micro-foamed material is substantially improved, the severe surface quality problems like surface scratches and gas marks on a polypropylene micro-foamed product in the process of injection molding are overcome, and the polypropylene micro-foamed material with excellent performance and high surface quality is obtained. The prepared polypropylene micro-foamed material is applicable to skinned and fabric-covered automobile components and to interior and exterior trimming parts for an automobile in a visual environment, e.g., door trim panels, guard boards of columns, hallstands, instrument desks, air-conditioner shells, guard boards for side skirts, scuff plates, thereby realizing lightweighting of materials for automobile parts; and the material is also applicable to other fields like architecture, electronics and shipbuilding.

This invention relates to one balance beam oil drawer induction motor saving control method and its device, which comprises the following steps: A, connecting induction operation parameters; b, induction motor entering power status to switch off from electricity network; c, induction motor and hollow excitation capacitor form alone island power system to collect induction motor operation parameters; d. induction motor entering automatic status to connect the electricity net, wherein, The control device comprises induction motor and alternating power circuit first switch elements and drive unit connected to the first switch elements, computer controller and data collection unit with inductance motor is connected to one hollow excitation capacitor.

The invention provides a biogas slurry optical treatment breeding system and a working method thereof. The biogas slurry optical treatment breeding system comprises a solid-liquid separation tank, a decomposition treatment tank, an aeration treatment tank, a pH value regulation tank, an algae culture tank and an animal raising tank which are sequentially arranged according to a treatment process. The solid-liquid separation tank, the decomposition treatment tank, the aeration treatment tank, the pH value regulation tank, the algae culture tank and the animal raising tank are sequentially connected in series end to end through connectors. The solid-liquid separation tank is used for carrying out sedimentation treatment and disinfection treatment on biogas slurry; the decomposition treatment tank is used for carrying out anaerobic and aerobic catabolism treatment on biogas slurry; the aeration treatment tank is used for carrying out aeration treatment on biogas slurry; the pH value regulation tank is used for carrying out supplementing and adjustment on the concentration, the pH value and the nutritive salt ingredient of biogas slurry; algae are cultured in the algae culture tank, and biogas slurry and biogas are utilized for providing nutrients for algae and are purified by algae; various aquatic animals are raised in the animal raising tank in an isolated mode, and main feed is provided for aquatic animals with algae. According to the biogas slurry optical treatment breeding system and the working method thereof, a cyclic and ecological culture industry is formed, and the environment is improved.

The invention discloses a method for preparing calcium-aluminum-silicon (CAS) glass ceramics by quickly sintering waste lamp tube glass, belonging to the building decorative material field. The method comprises the following steps of: (1), melting, water-quenching, grinding and screening the waste lamp tube glass to obtain glass powder; (2), adding proper quick lime to satisfy CAS glass ceramics component requirement; and (3), pressing and molding the uniformly-mixed powder material and sintering the powder material in a quick warming furnace to obtain the CAS glass ceramics. By taking the waste lamp tube glass powder as a main material and using the quick sintering process to process the CAS glass ceramics, the method has the characteristics of low material cost, low sintering temperature, short sintering time and high bending strength of the bending strength, and the like, achieves environment protection, energy saving, high added value and large-scale recycling of the waste lamp tube glass, and has notable economic and social benefits.

An analogical printing paper belongs to the technology field of papermaking, and is made through the following steps: adding 1.0-1.5 weight parts of barrier used for improving the smoothness and the permeability resistance of the paper, 2.0-2.5 weight parts of water resisting agent used for improving the water resistance of the paper and a proper amount of auxiliary agent to 100 weight parts of the paper pulp; papermaking; wetting and calendaring. By adopting the material of bleached plant fiber, the inventive method includes pulping, sizing, adding the chemical auxiliary agent and papermaking on the multi-cylinder line mesh paper machine to obtain the base paper, then wetting and supercalendering. The printing paper has the advantages that the paper has the appearance the feature of a polypropylene film-brightness and transparence, which, as packaging material instead of Bopp, is capable of fully degrading and protecting the ecological environment; in addition to the refined paper quality and high oil absorbency, the analogical printing paper has fine printing quality and high water resistance, in case of raining and drenching, the paper is capable of water resisting, keeping the paper surface smooth and being free from deformation, breakage and decoloring. The paper is applicable to the packaging material and plays a role in the moisture-proof preservation of the food and is capable of extending 30% of the preservation period.

The invention discloses a preparation method for a shaving board with high moisture content. The preparation method comprises the following specific steps: carrying out shaving screening on raw materials of different specifications and drying qualified shavings; weighing the shavings according to the density and the size of the to-be-manufactured shaving board and regulating the moisture content of each shaving to be 20-40 percent; enabling the sizing amount to be 5-8 percent by weight; uniformly laying the sized shavings in a mould, and hot-pressing for 8-10 minutes under the density of 700-800 g / cm<3> at the temperature of 130-140 DEG C so as to obtain the shaving board with high moisture content. The shaving board with high moisture content prepared by the method has high mechanical property and excellent size stability, such as lower water absorption and thickness swelling rate, reduces formaldehyde release quantity, and is beneficial to physical health.

The invention relates to a wall-flow preventing spray tower which comprises a tower body, a driving chamber, a water tank, a water pump, a water suction pipe, an air intake pipe and an air exhaust pipe; a spray mechanism comprises a mixing component, a vibrating component and a plurality of first spray heads; the mixing component comprises a first bevel wheel, a second bevel wheel, a rotation shaft, a support unit, a first mesh plate, a second mesh plate and two mixing plates; a wall-flow preventing mechanism comprises a circular ring and a plurality of water spray components; and each water spray component comprises a first gear, a second gear, a second spray head, a connecting pipe, a concentric shaft, a power component and two connecting components. The wall-flow preventing spray towerhas the advantages that the spray mechanism drives the mixing plate to rotate, and a vibrating plate is enabled to knock the lower side of the second mesh plate, therefore, a filler between the firstmesh plate and the second mesh plate is enabled to be evenly distributed for being convenient in full absorption of acidic materials in exhaust gas; furthermore, an alkali liquid flowing downward is evenly sprayed onto the lower part inside the tower body through the wall-flow preventing mechanism and is convenient to be in sufficient contact with the exhaust gas for reacting, thereby improving the practicability of equipment.

The invention discloses a central air conditioning industry management system based on a cloud platform. The central air conditioning industry management system comprises an equipment layer, a cloud platform layer and a service layer, wherein the equipment layer is in communication with the cloud platform layer, and the cloud platform layer is in communication with the service layer. According tothe central air conditioning industry management system, real-time monitoring and alarming of central air conditioning system equipment can be realized through the equipment layer and the cloud platform layer, acquired data can be analyzed and processed in real time, finally, the information is transmitted to the equipment layer and the service layer, people can rapidly, more scientifically and more reasonably maintain the central air conditioning system equipment in advance through the service layer, and therefore environmental protection and energy conservation can be better realized; if people do not maintain the central air conditioning system equipment in time, the cloud platform layer can perform human intervention on the central air conditioning system equipment by sending a controlinstruction to the equipment layer, and therefore the stability and the reliability of the system can be effectively improved; and in addition, a good communication platform can be provided for various enterprises and individual personnel in the central air conditioning industry, and the development of the industry can be effectively promoted.

The invention belongs to the field of non-oxide ceramic materials, and discloses high-performance nano silicon carbide ceramic as well as a preparation method and application thereof. The preparationmethod of the silicon carbide ceramic comprises the following steps of: ball-milling and mixing polycarbosilane serving as a precursor and a sintering aid Al2O3-CeO2, heating to 200-400 DEG C in a protective atmosphere, keeping the temperature, heating to 500-1200 DEG C, and cracking the mixture to obtain mixed powder; and carrying out ball milling and granulation on the mixed powder, putting thegranules into a graphite mold, applying pressure of 1-20 MPa, and sintering at 1200-1450 DEG C in a protective atmosphere. Through the size effect, the thickness of the sample is controlled, so that the density of the sample is 97% or above, the Vickers hardness is 25-35 GPa, the bending strength is 700-1200 MPa, the breaking tenacity is 6-12 MPa.m<1 / 2>, and the high-temperature strength at 1200 DEG C is 800-1300 MPa. The ceramic can be widely applied to the field of nuclear energy.

The invention discloses a concrete spraying machine. The concrete spraying machine structurally comprises a sieve-type feeding hopper, a slag discharging hopper, an automatic vibrating sieving device,a damping spring seat, a mixing rotor device, a cyclone, a machine body base, a control electric box, a fixed pipe frame, a controlling wire pipe, a flow-dividing spraying pipe and a moving idler wheel, the sieve-type feeding hopper is of a circular hopper-shaped structure, and the slagging hopper is arranged on the upper portion of the left side of the sieve-type feeding hopper and in penetrating connection with the upper portion of the left side of sieve-type feeding hopper through electrowelding. According to the concrete spraying machine, by arranging the automatic vibrating sieving device, a vibrating device can be automatically started or stopped according to whether raw materials such as cement and sand are added into the feeding hopper or not, the function of immediate starting and immediate stopping is achieved, energy and power are saved, the automation degree of the concrete spraying machine is effectively enhanced, the working efficiency of the concrete spraying machine isimproved, and environmental protection and energy saving are achieved.

The present invention relates to a waste heat recovery system which utilizes waste heat discharged from a volatile organic compound (VOC) treatment apparatus to realize green and energy saving proposes. An exhaust gas type absorption chiller heater produces cold water or hot water utilizing heat energy of exhaust gas discharged from a VOC treatment apparatus which executes combustion and component decomposition at a high temperature of VOC emitted from a VOC emitting apparatus in operation. Using the cold water or hot water to an air-conditioning apparatus of a factory or a cooler of the VOC emitting apparatus achieves environmental friendliness and energy conservation measures. Since clean exhaust gas discharged from the VOC treatment apparatus is guided into the exhaust gas type absorption chiller heater, durability of the exhaust gas type absorption chiller heater can be maintained.

The invention discloses an intelligent lighting method, which comprises the following steps: a server obtains real-time road condition information; the brightness of each lamp group is adjusted according to the real-time road condition information; The real-time road condition information includes at least pedestrian flow and / or vehicle flow characteristic information. By the method, the inventioncan realize the adaptive adjustment according to the road condition, realize the environmental protection and energy saving, and reduce the input of manpower and material resources of the public lighting. The invention also provides an intelligent lighting system, comprising: a lamp group in the intelligent lighting method and a server wirelessly connected with the lamp group; The server obtainsthe real-time road condition, and sends a preset instruction to the lamp group according to the real-time road condition, and the lamp group adjusts the brightness according to the preset instruction.The present invention also provides a storage medium having a storage function, in which program data is stored, and a method for realizing intelligent lighting as described above when the program data is executed.

The invention discloses a thermal recovery system of a centrifugal compressor. According to the technical scheme, the thermal recovery system is characterized in that N-level compression hosts are connected with an oil cooler through pipelines; an Nth-level heat exchanger is connected with a cold water pipeline and a second circulation water pump; a first-level heat exchanger is connected with a hot water pipeline; the normal-temperature water is pressurized at the second circulation water pump through the cold water pipeline and enters the Nth-level heat exchanger for heat exchange, the normal-temperature water enters a (N-1)th heat exchanger after getting out of the Nth-level heat exchanger, then enters the first-level heat exchanger after multi-time heat exchange and gets out of the first-level heat exchanger. The temperature of the normal-temperature cold water can be increased to the rated temperature, and the thermal energy produced by the compressor can be effectively recycled.

The invention discloses an infrared automatic hand drier circuit. The infrared automatic hand drier circuit is characterized by comprises a blower, a power circuit (1), a control circuit (2) connected with the output end of the power circuit (1), a driving circuit (3) connected with the output end of the control circuit (2), an infrared transmitting and receiving circuit (4) connected with the output end of the driving circuit (3), a signal amplifying circuit (5) connected with the output end of the infrared transmitting and receiving circuit (4), and a time-delay circuit (6) connected with the output end of the signal amplifying circuit (5). The blower is connected with the power circuit (1). According to the infrared automatic hand drier circuit, the blower is controlled through infrared to dry hands, so that compared with a traditional paper wiping mode, the infrared automatic hand drier circuit can save a large amount of paper and achieve environmental protection and energy conservation.

The invention provides a server resonance weakening method which employs a high-precision dynamic signal analyzer for multi-contact measurement of vibration conditions of each part and rigid joints. Capturing vibration source positions and vibration transmission modes is the key point, and in order to guarantee reliability and precision of measured data, a vibration sensor needs to be attached to a vibration source as far as possible to capture the vibration conditions of parts in real time. Further, vibration of three positions in different directions are measured at the same time to accurately measure from multiple space angles and feed system and part vibration conditions back, so that reliability of measurement data can be guaranteed. The rotation speed of a fan is simulated and adjusted through a fan speed adjusting control panel when a server is in different power consumption, operation conditions of the fan are directly reflected by means of LED real-time display, and a system and part vibration test can be completed without electrifying the server, so that testing workload is reduced, energy conservation and environment protection are realized, and operating cost is reduced.

The invention discloses a preparation method for a shaving board with high moisture content. The preparation method comprises the following specific steps: carrying out shaving screening on raw materials of different specifications and drying qualified shavings; weighing the shavings according to the density and the size of the to-be-manufactured shaving board and regulating the moisture content of each shaving to be 20-40 percent; enabling the sizing amount to be 5-8 percent by weight; uniformly laying the sized shavings in a mould, and hot-pressing for 8-10 minutes under the density of 700-800 g / cm<3> at the temperature of 130-140 DEG C so as to obtain the shaving board with high moisture content. The shaving board with high moisture content prepared by the method has high mechanical property and excellent size stability, such as lower water absorption and thickness swelling rate, reduces formaldehyde release quantity, and is beneficial to physical health.

The invention relates to an environment-friendly energy-saving coal stove. The environment-friendly energy-saving coal stove comprises a coal stove body, wherein a combustion chamber is formed in the middle of the coal stove body, a combustion supporting plate is arranged at the bottom of the combustion chamber, a dust recovering chamber is formed in the lower end of the combustion supporting plate, and a dust clearing hole is formed in one side of the dust recovering chamber; a water tank is arranged at one side of the upper end of the coal stove body, a water injecting hole is formed in the upper end of the water tank, the lower end of the water tank is connected with one end of a heating tube, the heating tube is wound around the combustion chamber, and an outlet in the lower end of the heating tube is provided with a water valve and a water outlet. The environment-friendly energy-saving coal stove is simple in structure and reasonable in design; as the water tank and the heating tube are arranged, when coal is combusted in the combustion chamber, coal stove heat dispersed outwards can heat water in the heating tube, pure heat dissipation amount is reduced, and environmental protection and energy conservation are achieved.

The invention discloses a sludge drying method to which radio frequency electromagnetic energy is applied. The sludge drying method includes the following steps that 1, to-be-treated sludge is stirred, blocky solids are decomposed, and solids and liquid of the sludge are fully mixed to achieve a uniform conditioning scattered state; 2, the sludge treated in the step 1 is guided into an electromagnetic field which is changed at a high speed for a heating reaction; 3, the sludge treated in the step 2 is continuously heated in the electromagnetic field which is changed at the high speed, and the temperature is kept between 260 DEG C and 280 DEG C; 4, the sludge treated in the step 3 is continuously cooled in the electromagnetic field which is changed at the high speed. According to the sludge drying method to which radio frequency electromagnetic energy is applied, and resource comprehensive efficiency wealth benefits can be created for enterprises from the aspects of the disposal method for the sludge, process quantification, environment friendliness and energy conservation achieved in industrial application and reducing and harmless environment-friendly use.

The invention discloses a fog-dissipation water-saving evaporative condenser. The fog-dissipation water-saving evaporative condenser comprises a shell, a water tank arranged at the bottom of the shell, a heat exchange pipe arranged on the upper middle portion of the shell, a spraying device arranged over the heat exchange pipe, a filling device arranged under the spraying device and a draught fanarranged on the shell, wherein the spraying device is connected with the water tank through a water pump and a pipeline; an air suction opening of the draught fan is located in the rear side of a heatexchange pipe bundle of the shell, and an upper air inlet and a lower air inlet are formed in the upper portion and the lower portion of the shell respectively; a fog dissipation device is arranged on the lower portion of the shell and located on the outer side of the filling device, and the fog dissipation device is connected with the heat exchange pipe bundle in series; and a partition plate isarranged on the rear side of the heat exchange pipe bundle, the heat exchange pipe bundle is separated from the air suction opening of the draught fan through the partition plate, and an upper watercollector is arranged below the partition plate. The fog-dissipation water-saving evaporative condenser has the advantages that evaporation loss of spraying water is reduced, white fog formed when anoutlet of the draught fan is condensed when subject to cold in winter is reduced, the water floating rate of the evaporative condenser is reduced, water vapor is reduced, and environmental protectionand energy conservation are achieved.

The invention particularly discloses a computer heat dissipating device. The computer heat dissipating device comprises a heat absorbing unit, a heat dissipating unit and a moving unit; the heat absorbing unit comprises a heat absorbing plate and an air cylinder on the heat absorbing plate; the air cylinder is provided with a piston with a first magnet inside; the piston is connected with a rack;a gear shaft is arranged above the air cylinder; the gear shaft is provided with a gear to mesh with the rack; the heat dissipating unit comprises heat dissipating boards and fans; each fan compriseselastic telescopic rods; the elastic telescopic rods are slidably connected with ends of the gear shaft; two ends of each elastic telescopic rod are connected with fan blades; a second magnet is mounted on each fan blade; two magnetic poles of the ends, close to each other, of the two second magnets are opposite; the moving unit comprises disc-shaped cams, pull rods and ejector rods; the disc-shaped cams are rotatably connected with the gear shaft; the pull rods are symmetrically connected with two side walls of each heat dissipating board; one end of each pull rod is respectively connected with an ejector rod; and one end of each ejector rods abuts against the disc cam. By adopting the device, the problem of additional electric energy required for heat dissipation is solved, and a betterheat dissipation effect is achieved.

The invention provides a heat preserving and insulating coating material, prepared from the following components in parts by weight: 16-24 parts of styrene-acrylic emulsion, 20-25 parts of lime powder, 5-8 parts of sodium polycarboxylate, 6-9 parts of thickener, 2-4 parts of barium sulfate, 10-12 parts of borax, 10-15 parts of yttrium oxide and 5-8 parts of propylene glycol. The heat preserving and insulating coating material is good in levelling property, can be brushed on an inner wall or an outer wall of a house by using a brush, and also can be sprayed on the inner wall of outer wall of the house in a spraying way; the added yttrium oxide in the coating material can improve a heat preserving and insulating function of a paint film, so that the house has a better heat preserving and insulating effect, and further environment protection and energy saving are realized.

The invention provides a remote ocean platform illumination control and management system. The remote ocean platform illumination control and management system comprises a plurality of illumination units, an emergency lamp, an emergency power supply, a detection unit, control units, consoles, an Internet network center, a monitoring server, an environment parameter collection module and an illumination management remote control terminal computer, wherein the environment parameter collection module is connected with the Internet network center and is capable of detecting the luminance of environments where lamps are located and illumination areas and sending detection results to the monitoring server through a wireless network, and the illumination management remote control terminal computer is connected to the monitoring server through the wireless network. The remote ocean platform illumination control and management system has the advantages that the system is capable of effectively managing the lamps by monitoring the luminance of the environments where the lamps are located and the illumination areas, so that both high adaptability and information management of an illumination system are achieved, illumination effects are improved, environmental friendliness and energy conservation are achieved, lamp maintenance workload is reduced, the lamp service life is prolonged, and workload of working personnel is lowered; the emergency power supply can be utilized to illuminate an ocean platform continuously under exceptional circumstances, so that emergency performance is improved substantially.

The invention relates to a latch connection type spliced red wine rack, which comprises two supporting side plates and front and back wine storage plates; the front and back wine storage plates are formed in a manner that two to five spliced assemblies are spliced together; each spliced assembly is provided with two to four semicircular grooves; a latch clamping groove is disposed under each semicircular groove; latch clamps are arranged at the both ends of each spliced assembly; latch clamp grooves are arranged at the both sides of each of two supporting side plates; and the latch grooves ofthe spliced assemblies of the two supporting side plates and the front and back wine storage plates are mutually clamped, fixed and assembled by the latch clamps. The rack is automatic to assemble, convenient, fast and small in packaging volume, and can save packaging, storing and transporting space; and the rack realizes environment protection and energy saving without adhesive connection of nails and glues; moreover, the rack has beautiful style and not only can meet demand of storing red wine for a short time in most of families but also has decorative effect.

The invention discloses a monorail crane hydraulic rock drilling machine. The monorail crane hydraulic rock drilling machine comprises a monorail crane system and a hydraulic rock drilling system arranged at the front end of the monorail crane system; a hoisting beam, a first driving part, a control box, a second driving part and the hydraulic rock drilling system are sequentially connected through connecting rods, and a storage battery is in circuit connection with the control box; the control box is correspondingly connected with the first driving part, the second driving part and an oil path of the hydraulic rock drilling system; and the hydraulic rock drilling system comprises an upper adjusting mechanism, a middle adjusting mechanism, a lower adjusting mechanism and a hydraulic rock drilling machine. According to the monorail crane hydraulic rock drilling machine, the hydraulic rock drilling machine can be dragged through a monorail crane, other to-be-transported equipment can bedirectly connected to the monorail crane, the problem of underground upper-layer space utilization can be solved, the roadway construction time is shortened, and the construction efficiency is improved.

The invention belongs to the technical field of electrostatic spinning, and relates to a teaching demonstration device for the electrostatic spinning. The teaching demonstration device mainly comprises an electrostatic induction machine with a discharge rod being removed, an injector metal bracket, an injector filled with a spinning solution, a wire, a hollow stainless steel needle, electrified jet flows or spinning fibers, a metal net collector and a collector metal bracket, wherein one end of the injector metal bracket is welded with a metal bar at the top of a leyden jar in the electrostatic induction machine with the discharge rod being removed; the other end of the injector metal bracket is used for fixing the injector; one end of the wire is connected with the injector metal bracket; the other end of the wire is connected with the hollow stainless steel needle mounted on an injector needle tube; one end of the collector metal bracket is welded with a metal bar at the top of another leyden jar in the electrostatic induction machine with the discharge rod being removed; and the other end of the collector metal bracket is welded with the metal net collector. The teaching demonstration device is simple in structure, reliable in method and principle, low in fabrication cost, good in demonstration effect, high in safety and environmentally friendly; and demonstration conditions are easy to achieve.