91results about How to "Low installation environment requirements" patented technology

The invention discloses an automatic flight surface cleaning robot for a photovoltaic array, and relates to the technical field of photovoltaic module cleaning. A DC motor is connected with a power supply. The DC motor operates to drive an air pump to generate high pressure gas, and the gas is then transmitted to air nozzles through corresponding pipelines. The pipelines are installed on supports on the two sides of an unmanned aerial vehicle. The pipelines are provided with blow holes, and the air nozzles are installed at the blow holes. A scrubbing dust collection device is composed of a rotating motor, a lifting device, a universal coupling and cleaning brush heads. The lifting device is a telescopic cylinder, and the top end of a piston rod of the cylinder is connected with the rotating motor through the universal coupling. The rotating motor is connected with the cleaning brush heads. A high definition camera, an intelligent control unit, the DC motor and the rotating motor are all connected with the power supply. The intelligent control unit controls the high definition camera, the lifting device, the DC motor and the rotating motor. The automatic flight surface cleaning robot for the photovoltaic array can conduct surface cleaning on the photovoltaic array installed on roofs, water surfaces, farmland and slopes.

The invention discloses a gas-liquid two-phase self-adaption constant flow distributor. The gas-liquid two-phase self-adaption constant flow distributor comprises gas-liquid separation devices and gas-liquid mixers; a distribution branch at the rear of each gas-liquid mixer is provided with a self-adaption constant flow valve; a flow adjustment stop valve is arranged between each mixer and each self-adaption constant flow valve; a dryness flow meter is arranged at the rear of each self-adaption constant flow valve; due to the characteristic of constant flow of the self-adaption constant flow valves, the distributor can assimilate the influence of incoming flow or pressure fluctuation of certain working areas on the resistance characteristic of a system in a wide flow range, and performs self-adaption adjustment according to the designed flow; and the flow and dryness of other distribution branches are not influenced when the flow of certain distribution branches is changed, so the flow can be adjusted quickly.

The method and device for measuring pump flux of diesel engines and preventing overload. The rotating speed and the lift of the pump are transferred to the control computer. Based on said two parameters, with the real time flux of the pump being calculated, the control computer determines whether the pump is overloaded. The device comprises the speed sensor installed on principal axis of diesel engines, the pressure sensor installed on outlet of the pump and the control computer connected to said two sensors. The invention provides the features of high measuring accuracy, accurate early warning, simple structure and low cost. The invented device can be applicable to low price pumps of diesel engine or other water supply systems.

The invention provides a belt induction sensitive device of a safety belt retractor. The belt induction sensitive device comprises a ratchet wheel, a linkage lever, belt induction inertia steel balls and a return spring; the ratchet wheel comprises an end plate, ratchets formed at the edge of the end plate, an inertia steel ball groove for containing the belt induction inertia steel balls, a clamping jaw sliding groove, a return spring ratchet wheel end and a belt winding barrel shaft hole formed in the middle of the end plate; the linkage lever is connected with the end plate in a rotatable mode and comprises a force transmission rod, a return spring lever end arranged at one end of the force transmission rod, an impact rod arranged at the other end of the force transmission rod and arranged in the mode of facing the belt induction inertia steel balls and clamping teeth arranged at the tail end of the impact rod, one end of the return spring is connected to the return spring ratchet wheel end, and the other end of the return spring is connected to the return spring lever end. The belt induction sensitive device is fewer in part, simpler in structure, not high in requirement for installation environments, low in machining cost and easy to assemble.

The invention relates to the field of LED display screens, in particular to a front demounting structure of an LED module. The front demounting structure comprises a front module and a back module, which are respectively mounted on an LED display screen; front fastening pieces are arranged on the front module, and rotary spring mechanisms are arranged on the back module; the front module is pushed to enable the front fastening pieces to push one ends of the rotary spring mechanisms to achieve the fastening of the front fastening pieces and the rotary spring mechanisms; jigs are movably mounted on the front module; the jigs are pushed to push the other ends of the rotary spring mechanisms to enable the rotary spring mechanisms to be separated from the fastening of the front fastening pieces in a rotating manner to pull out the front module. According to the invention, the LED module can be mounted in and demounted from the front of the LED display screen; an operator can position a failure LED module only from the front without walking forward and backward; therefore, the mounting, maintenance and demounting time can be greatly saved, and the whole mounting and demounting process is simple, convenient and quick.

The invention provides a high-altitude parabolic monitoring method. The method comprises the following steps: erecting a camera at the top of a building according to the size of the building, monitoring the side parabolic condition of the building, and sending a video file to a control center; enabling the control center to judge whether a parabolic condition occurs or not through comparison of adjacent picture frames, finding out a timestamp of the picture frame where the parabolic target occurs for the first time, fining out images shot by all the cameras at the moment, and carrying out binarization processing to obtain a binarized image corresponding to each camera; establishing a rectangular coordinate system corresponding to the room number along the building monitoring surface, determining the coordinate corresponding to each camera and the geometrical relationship between the parabolic point and the camera, calculating the parabolic coordinate corresponding to the parabolic point in combination with the binarized image, and obtaining the room number corresponding to the parabolic coordinate. The rectangular coordinate system is established along the monitoring side surface of the building, the room number of the parabolic object can be quickly positioned according to the calculated parabolic object coordinate, and high-altitude parabolic object tracking, education and responsibility investigation are facilitated.

The invention discloses an underground uninterrupted emergency illumination and safety indication system for a coal mine. The underground uninterrupted emergency illumination and safety indication system comprises a switching mode power supply (1), a charger (2), a battery management unit (3), a power supply control unit (4), a storage battery pack (5) and a load (6), wherein the switching mode power supply (1) is electrically connected with a mining alternating-current power supply and used for converting alternating-current power from the mining alternating-current power supply into low-voltage direct-current power; the charger (2) is used for charging the storage battery pack (5) through the battery management unit (3); the battery management unit (3) is used for acquiring the signals of the voltages of unit batteries of the storage battery pack (5), the temperatures of the unit batteries of the storage battery pack (5), the voltage of the storage battery pack (5), the charging current, the discharging current and / or the capacity of the storage battery pack (5), and when the signals become abnormal, the battery management unit (3) gives an alarm and protects the storage battery pack (5); and the power supply control unit (4) is used for charging the load (6) by using the switching mode power supply (1) or the storage battery pack (5). When the mining alternating-current power supply is in failure, the response time of the system for emergency uninterrupted emergency illumination is 30 ms-1 s.

The invention relates to an automatic leveling control system for a construction hoist. The automatic leveling control system is used for stopping a suspension cage according to leveling insertion plates arranged on a stop layer. The automatic leveling control system comprises a first sensor, a second sensor, a third sensor and a main control unit, wherein the first sensor, the second sensor and the third sensor are arranged at different height positions on the suspension cage sequentially; the main control unit is used for determining a target suspension cage stop layer by calculating the number of the leveling insertion plates through which the first sensor, the second sensor and the third sensor pass, reduces the speed of the suspension cage when the first sensor or the third sensor passes through the target stop layer according to a running direction of the suspension cage, and stops the suspension cage when the second sensor reaches the leveling insertion plate of the target stop layer. The invention also provides the corresponding construction hoist. By the invention, the installation complexity is reduced greatly, the use reliability is improved and a self-learning process of equipment is also avoided.

The invention provides an X-band miniaturized cone-spiral antenna which comprises a dielectric cylinder, an outer conductor, a metal spiral line, an inverted L-shaped inner conductor, a first dielectric pillar, a second dielectric pillar, an insertion core, a core sleeve and a metal base plate. The dielectric cylinder is a non-metallic cylinder with a hollow inner part. The outer conductor is a metal shell with a hollow internal part and is placed in the dielectric cylinder. The metal spiral line passes through the dielectric cylinder, and an upper end of the metal spiral line is connected toan outer wall of the outer conductor. The first dielectric pillar sleeves an outer part of the inverted L-shaped inner conductor and is fixed to a top L-shaped part, and the second dielectric pillar is fixed to a narrow groove of the inverted L-shaped inner conductor. The inverted L-shaped inner conductor is fixed in a hollow cylinder with a larger diameter at the upper end of the insertion core.The length of the core sleeve is same with that of a narrow cylinder at the lower end of the insertion core, the core sleeve sleeves the outer part of the narrow cylinder at the lower end of the insertion core, and an antenna feed structure is formed.

The invention provides a multi-drive safe lifting elevator. The multi-drive safe lifting elevator comprises a guide rail assembly, a lift car assembly running on the guide rail assembly, and a first power output module driving the lift car assembly to run on the guide rail assembly. The first power output module comprises a main power output drive and a lead screw. A second power output module isfurther included, and the second power output module is arranged at the top end or the bottom end of the lead screw. The second power output module comprises a servo motor fixed to a motor installingplate and used for outputting power, a coupler installed on an output shaft of the servo motor and used for transmitting the power, and a two-way overrun clutch connected with a bearing block flange on the top of the lead screw, wherein one end of the two-way overrun clutch is connected with the coupler, and the other end of the two-way overrun clutch is connected with the lead screw. The safety performance of the elevator is improved, a steel wire rope or steel belt drive mode of a traditional elevator is omitted, the two power output modules independently run, and the functions of mutual acceleration, interference and rescue are achieved.

The invention provides edible mushroom planting equipment and a processing process thereof, belonging to the technical field of machines. The equipment comprises a mounting frame and a conveying chainwhich is horizontally arranged on the mounting frame, wherein a conveying device I, a mixing device, a soil conveying device and a conveying device II are arranged on the mounting frame; the conveying device I is used for conveying a planting frame into a feeding end of the conveying chain, the mixing device is used for conveying strains and fertilizers into the planting frame together, the soilconveying device is used for conveying soil into the planting frame, the conveying device II is used for conveying out the planting frame located at a discharging end of the conveying chain; the conveying device I, the mixing device, the soil conveying device and the conveying device II are sequentially distributed along the conveying direction of the conveying chain; the conveying device I is used for conveying the planting frame from top to bottom, and the conveying device II is used for conveying the planting frame from bottom to top. The processing process comprises the following steps: (A) frame conveying, (B) feeding, (C) flattening, (D) surface wave treatment, (E) soil covering and (F) frame fetching. The edible mushroom planting equipment has the advantage of convenience in use.

The invention belongs to the technical field of crystallizing device liquid level detection and discloses a crystallizing device liquid level measuring system and a measuring method. Real liquid level height of molten steel can be analyzed and acquired with an illuminating device capable of emitting structure lights arranged on the upper edge of the crystallizing device, and an image collection device collecting projections of the structural lights on a casting powder surface, the inner wall of the crystallizing device and a junction therebetween. The crystallizing device liquid level measuring system and measuring method is free of radioactive harm; special protection is unnecessary during production, transportation, storage, installation and use; multi-point information of metal liquid can be achieved; better control can be conducted according to the multi-point information by an automatic control system; the measuring system and method have low demands on installation environment, thereby capable of being installed on various continuous casting machines having small sections; the measuring system is free of smoke effect, so on-site environment can be protected and fluxing work cannot be affected; the measuring system can be conveniently installed; and without a change for crystallizing device inner wall, the crystallizing device liquid level measuring system possesses a price advantage.

Provided is an on-line monitoring device and a method for the motion state of a broach. The on-line monitoring device comprises an RFID anti-metal tag, a reader-writer and a support assembly of a motion monitoring device. The RFID anti-metal tag is mounted to a broach handle. The reader-writer is fixed onto a machine tool by means of the support assembly of the motion monitoring device and capable of adjusting the direction thereof within the certain angle range in order to ensure normal communication between reader-writer and the RFID anti-metal tag. The reader-writer transmits an electromagnetic wave signal with frequency band ranging from 901 to 928 MHZ. When the RFID anti-metal tag enters the region of a magnetic field with the broach, the RFID anti-metal tag receives the electromagnetic wave signal ad obtains energy for sending the electromagnetic wave signal from the interior. The reader-writer receives interior information sent out by the RFID anti-metal tag and writes in information on broaching frequency of the broach to the RFID anti-metal tag such that on-line and active accurate monitoring of the broaching frequency of the broach is achieved. The on-line monitoring device and method for the motion state of the broach has following beneficial effects: real-time and on-line monitoring of the total number of machined workpieces during the whole service lifetime of the broach is realized; characteristics such as non-contact and long recording duration are obtained; and the on-line monitoring device and method are suitable for broaches with different kinds of specifications.

A platform-level electronic control system of a rail transit platform safety barrier system comprises a control system and a power system. The control system comprises headstock local control panels, tailstock local control panels, headstock wireless control receivers, tailstock wireless control receivers, wireless transmitters mastered by station personnel, headstock obstruction lights, tailstock obstruction lights, middle obstruction lights, end barrier indicating lights, end barrier stroke limit switches and a plurality of electric-barrier electronic control units arranged corresponding to groups of electric barriers. The power system comprises a power distribution cabinet, a UPS (uninterrupted power supply), a storage battery and an isolating transformer, and supplies power to the headstock local control panels and each electric-barrier electronic control unit. The platform-level electronic control system of the rail transit platform safety barrier system has the advantages of simple structure, low cost, simple interfaces and convenience in post maintenance and the like, has a wireless operation function and is more flexible and convenient to control.

The invention relates to a nonstandard electric guardrail of a rail transit station safety guardrail system, and the nonstandard electric guardrail comprises a group of electric guardrails and a group of electric control units; the group of electric guardrails consists of a right fixed guardrail, a left fixed guardrail, a right slide guardrail, a left slide guardrail, a right transmission mechanism, a left transmission mechanism, a right locking mechanism and a left locking mechanism. The electric control unit comprises an electric guardrail control unit and a local control box, the electric guardrail control unit and the local control box are respectively installed on one fixed guardrail and connected with each other through a cable, the electric guardrail control unit is arranged on a track side, and the local control box is arranged on a station side. The nonstandard electric guardrail has advantages of simplicity in structure, low cost, low maintenance expense, low requirement on installation environment of the station, simple interface, short project period, convenience in later maintenance and the like, also has a wireless operation function, saves labor, and is more flexible and convenient to control.

The invention discloses a lath type carbon dioxide glass tube laser. The laser comprises a core discharge cavity. The core discharge cavity is sequentially coated with an inner glass tube and an outerglass tube, a positive discharge electrode and a negative discharge electrode are arranged at the two ends of the inner glass tube respectively, and an air return disc and a fixed disc are arranged at the positions, close to the positive discharge electrode and the negative discharge electrode, of the two ends of the inner glass tube respectively. Under the condition that the length is not increased, discharge volume is increased, working gas pressure is high, the obtained saturated light intensity is higher, that is, the laser gain is increased. The power output of the laser is approximatelyin direct proportion to the laser gain and in direct proportion to the saturation light intensity, so that higher laser output power can be obtained, the production cost of the laser tube is reduced,and under the condition of outputting the same laser power, the lath type carbon dioxide glass tube laser is shorter and has lower requirements on transportation and installation environments.

The invention relates to an assembled retaining wall and a construction method thereof. The assembled retaining wall comprises a plurality of box bodies which are arranged transversely and overlaid upand down and cover plates connecting adjacent box bodies up and down and left and right, wherein the cover plates are arranged between the two box bodies up and down and are connected between the left and right box bodies; bumps are arranged on the upper and lower end surfaces of each cover plate; the two bumps on the same end surface are separately locked into cavities of left and right adjacentbox bodies on the same side. By adopting an off-site cast-in-place concrete module and carrying out construction at the slope toe in a site mounting mode, the construction environment problem can besolved better, the construction technology is specified, the construction quality is ensured, the demand on the mounting environment is relatively low, the technical demand is not high, the construction progress is improved, the concrete module is simple in structure, scaled production can be achieved, and the construction cost is lowered.

The invention relates to an image detection anti-theft alarm. The image detection anti-theft alarm mainly comprises a camera, a central processing module, a buzzer, a red light, a green light and a power source adapter; the camera, the buzzer, the red light, the green light and the power source adapter are all connected with the central processing module; and the central processing module is provided with a central processor and an operation panel; and the operation panel is provided with a manual detection key, a reset key and a switching key. The image detection anti-theft alarm has a very low false alarm rate and can accurately identify the complicated conditions of various kinds of non-manmade interference. According to the image detection anti-theft alarm, manmade movement signs are identified based on images, so that the image detection anti-theft alarm has characteristics compared with a traditional anti-theft alarm; the camera is adopted as a signal acquisition tool, since the camera is a non-contact tool, the camera is neither affected by environmental temperature nor effected by space, and has low requirements for an installation environment; and thus, the image detection anti-theft alarm of the present invention has the advantages of high accuracy, simple operation, high safety, high reliability and convenience in popularization, and can be widely applied to places such as factories, large-scale shopping malls, residential buildings, warehouses and parking lots.

The invention belongs to the technical field of sterilizers, and relates to a cleaning sterilizer with multiple cleaning modes. The cleaning sterilizer comprises a cleaning cabin body as well as a water supply unit connected to the cleaning cabin body and a water drainage box, wherein the cleaning cabin body is further connected to a spraying cleaning unit, a pulsation vacuum cleaning unit and anultrasonic cleaning unit; each of the pulsation vacuum cleaning unit and the ultrasonic cleaning unit comprises an inner room pressure control mechanism and a liquid level sensor mechanism; each of the spraying cleaning unit and the ultrasonic cleaning unit further comprises a spraying arm arranged in the cleaning cabin body and an ultrasonic transducer arranged in the cleaning cabin body; the pulsation vacuum cleaning unit further comprises a liquid-phase haul-back tube and a gas bubble generator; and the bottom of the cleaning cabin body is equipped with an inner room temperature sensor. Thecleaning sterilizer has multiple cleaning modes, meets needs of supply rooms of a hospital, is relatively small in size, and is small in occupied supply room area of the hospital.

The invention discloses a parallel type vehicle carrying robot and parking equipment. The parallel type vehicle carrying robot comprises a support frame, a walking mechanism, a lifting system and a lift car with a rotary disc, wherein the support frame comprises upright post rails and a top cross beam, the walking mechanism is arranged at the bottoms of the upright post guide rails, the lifting system is arranged on a cross beam arranged on the top, and the lift car with the rotary disc is arranged between the upright post guide rails and can upwards and downwards move along the upright post guide rails under the effect of the lifting system. The parallel type vehicle carrying robot and the parking equipment have the advantages that the limitation of conventional parking equipment is broken through, the vehicle access efficiency can be improved, and the cost of the whole equipment is reduced; through middle line civil engineering upright post regions, the parallel type carrying robot can operate, ordinary vehicles can also pass on the ground, and three-dimensional transportation allowing parallel carrying trolleys and ordinary vehicles at top and bottom is formed. The vehicle passing speed is greatly accelerated.

The invention discloses a knife grinding device for a plastic packaging bag shearing knife. The knife grinding device comprises a bottom plate, a grinding assembly, a moving assembly and a clamping assembly, wherein the grinding assembly, the moving assembly and the clamping assembly are arranged on the bottom plate, the grinding assembly comprises a mounting table and a motor arranged at the topof the mounting table, and a knife grinding stone is arranged on an output shaft of the motor. The clamping assembly is fixed to the moving assembly. According to the knife grinding device for the plastic packaging bag shearing knife, a cutting edge is ground in a semi-automatic mode, the knife grinding efficiency is improved, the labor intensity of workers is reduced, a blade fixing plate with the adjustable inclination angle is arranged, the grinding inclination angle of the knife grinding stone to the cutting edge can be adjusted according to actual needs, and the applicability is good; anadjustable blade locking assembly is arranged, and rectangular blades of different size can be adapted and locked and ground; and the knife grinding device is simple in structure, low in requirement for the installation environment, not prone to breaking down and simple in later maintenance and repair.

The invention discloses a lifting mechanism and a lifting system based on the lifting mechanism for a large structural part, and belongs to the technical field of lifting devices. The lifting mechanism comprises a pulley block which is composed of a fixed pulley and a movable pulley, and further comprises a low pull-up mechanism and a high auxiliary hanging bracket; the pulley block is fixed onto the auxiliary hanging bracket through a rotary shaft of the fixed pulley; and the pull-up mechanism passes through a slide slot of the pulley block through a pull wire to drive the movable pulley to lift a heavy object to ascend. In addition to the lifting mechanism, the lifting system for the large structural part further comprises pedestals which are symmetrically arranged left and right and are fixedly arranged at the two sides of the large structural part, and structural stand columns which is fixedly arranged on the pedestals perpendicularly. The lifting mechanism does not need a crane; in case of not needing to adopt the crane, the pull-up mechanism is fixedly arranged on a low position and the auxiliary hanging bracket is fixedly arranged on a high position by mounting the lifting mechanism, so that a large steel structure and a reinforced concrete component can be lifted, and therefore, maneuverability is strong and requirements on mounting environment of a processing site are low.

The invention provides a device and a method for rapidly determining the design eye position of a hoisting head-up display. The device is a rigid bending metal plate, and three mounting holes and oneobservation hole are formed in the metal plate. The space position between the three mounting holes and the observation hole reflects that the space position between a mounting bracket and the designeye position, so that after a positioning metal plate is arranged on the mounting bracket, the observation hole position on the positioning plate is the position of the actual design eye position, andthe design eye position can be rapidly positioned. The space position of the head-up display design eye position can be determined precisely and rapidly by utilizing the relatively fixed space position relation. The error fluctuation of finding the design eye position at each time by the traditional method is avoided; and compared with the traditional method, and the positioning method is more accurate and is stable and reliable in positioning precision at each time.

The invention discloses a method for monitoring dumping-type collapse disaster. The method comprises the following steps that 1, a monitoring system is constructed; 2, the sizes of dangerous rock bodies and the dip angles of the bottom faces of the dangerous rock bodies in an actual state are input into a data processing center, and the critical dip angles of the collapsed dangerous rock bodies are calculated through a dip angle distinguishing method; 3, a plurality of monitoring devices are arranged at cracks in the rear edges of the dangerous rock bodies, and angle data of the multiple setsof inclined dangerous rock bodies are measured; 4, the multiple sets of angle data measured in the step 3 are sent to the data processing center, the data processing center processes the multiple setsof angle data, and thus the dip angles of the dangerous rock bodies are obtained; and 5, the dangerous rock body dip angles obtained in the step 4 and the critical dip angles obtained in the step 2 are compared and judged in the data processing center. According to the method for monitoring the dumping-type collapse disaster, the criterion that the dangerous rock bodies collapse due to the overlarge dip angles is provided, the collapse disaster can be pre-warned in advance through easy measurement and judgment, and the safety of people and property is ensured.

The invention discloses a passenger-flow analytic method based on a touch screen technology, which is a novel passenger-flow statistic method. According to the passenger-flow analytic method, by means of analysis of a series of footprints when passengers walk through a touch screen plate, accurate passenger-flow data and passenger-flow gender composition can be obtained. Compared with a passenger-flow statistic method in the prior art, the method can provide more abundant passenger-flow information, is strong in interference resistance, is easy to deploy, and is low in installation environment requirement.

The invention discloses an automobile starter battery fuel economy comparison test device and a comparison method. The method comprises a step of driving a test vehicle onto a test bench during a comparison test such that two front drive wheels of the test vehicle are in contact with two roller mechanisms and installing stoppers according to a rear wheel position of the test vehicle, a step of selecting and grouping a non-lead-acid battery and a lead-acid battery with different aging degrees as sample batteries, a step of orderly installing the batteries in the test vehicle, testing the fuel consumption amounts of the sample batteries under different working conditions, and comparing the fuel consumption amounts of the non-lead-acid battery and the lead-acid battery of different aging degrees under the same working condition, and a step of comparing the fuel consumption amounts of the non-lead-acid battery and the lead-acid battery of with the same aging degree under the same working condition. According to the automobile starter battery fuel economy comparison test device and the comparison method provided by the invention, with the lead-acid battery as a reference, the fuel economy of a substitute battery and the fuel economy of the lead-acid battery are compared and evaluated.

The invention relates to a thermostatic electric water heater which comprises a shell, an inner container and a magnesium rod assembly arranged in the inner container, wherein a cold water inlet and a hot water inlet on the inner container are respectively connected with a water inlet connecting pipe and a water outlet connecting pipe, and a digital thermostatic valve part is arranged between thewater inlet connecting pipe and the water outlet connecting pipe; the digital thermostatic valve part comprises a thermostatic valve body, a temperature sensing pipe arranged in the thermostatic valve body, a thermostatic valve computer board, a thermostatic valve motor and a swaying block; an output shaft of the thermostatic valve motor is connected with the swaying block, and both ends of the swaying block are respectively arranged in the water inlet connecting pipe and the water outlet connecting pipe; a thermostatic water outlet pipe is arranged on the thermostatic valve body; the left end of the water inlet connecting pipe is connected with a cold water port end of the thermostatic valve body, and the upper end of the water inlet connecting pipe is connected with the cold water inlet; the right end of the water outlet connecting pipe is connected with a hot water port end of the thermostatic valve body, and the upper end of the water outlet connecting pipe is connected with a hotwater outlet. The thermostatic electric water heater saves water and electricity, is easy to operate and can accurately determine the mixing proportion of cold water and hot water so as to ensure that constant thermostatic hot water flows out of the thermostatic water outlet to realize comfortable scouring baths.

The invention relates to the field of LED display screens, in particular to a front demounting structure of an LED module. The front demounting structure comprises a front module and a back module, which are respectively mounted on an LED display screen; front fastening pieces are arranged on the front module, and rotary spring mechanisms are arranged on the back module; the front module is pushed to enable the front fastening pieces to push one ends of the rotary spring mechanisms to achieve the fastening of the front fastening pieces and the rotary spring mechanisms; jigs are movably mounted on the front module; the jigs are pushed to push the other ends of the rotary spring mechanisms to enable the rotary spring mechanisms to be separated from the fastening of the front fastening pieces in a rotating manner to pull out the front module. According to the invention, the LED module can be mounted in and demounted from the front of the LED display screen; an operator can position a failure LED module only from the front without walking forward and backward; therefore, the mounting, maintenance and demounting time can be greatly saved, and the whole mounting and demounting process is simple, convenient and quick.

The invention relates to an active power filter device based on voltage closed-loop control. The device comprises a filter shell, a front-end double-door leaf and a rear-end door leaf, the front-end double-door leaf and the rear-end door leaf are respectively positioned at the front end and the rear end of the filter shell and are movably connected with the filter shell; heat dissipation holes areformed in the side wall of the filter shell, clamping plates extending up and down are arranged at the positions, close to the two side edges, of the outer side of the side wall of the filter shell respectively, heat conduction covers are connected to the clamping plates in a sliding and clamping mode, refrigeration modules are arranged in the heat conduction covers, and the heat conduction covers cover the outer sides of the heat dissipation holes. The bottom of the filter shell is hollow and is connected with a bottom bin, a heat exchange fan is arranged in the bottom bin, and the lower endof the heat conduction cover is open and is communicated with the bottom bin. By means of the device, it can be guaranteed that the device has excellent heat dissipation efficiency, and the device can be suitable for various ground installation conditions.