58results about How to "Accurate close" patented technology

The invention discloses a touch screen cellphone capable of preventing misoperations during calls and a using method for the touch screen cellphone. The touch screen cellphone comprises a proximity sensor and an optical sensor, the method includes following steps: immediately utilizing the proximity sensor to measuring the distance between an external object and the touch screen cellphone during calls; obtaining optical intensity value outside through the optical sensor if the distance between the external object and the touch screen cellphone is larger than a set first distance threshold; and closing a touch screen if the optical intensity value outside is smaller than a set optical intensity threshold and the distance between the external object and the touch screen cellphone is smaller than a set second distance threshold simultaneously. The touch screen cellphone capable of preventing misoperations during calls and the using method for the touch screen cellphone have the advantages that when the proximity sensor judges that the cellphone is far away, the optical intensity value is read through the optical sensor, so that states of the cellphone can be judged more accurately, the screen of the cellphone can be guaranteed to be closed more accurately, misoperations can be prevented, and power consumption can be lowered.

The invention belongs to the field of environment protection equipment for atmospheric pollution abatement, in particular relates to a filter bag breakage detector for a bag type dust remover. The detector comprises a light source, a light conduction mechanism and a light detection mechanism; the light conduction mechanism is used for conducting light sent by the light source to an outlet of a filter bag; and the light detection mechanism is used for detecting the light intensity at the outlet of the filter bag, and outputting a detected light signal to a photoelectric detector, and the output end of the photoelectric detector is provided with a data acquisition process module. By measuring the intensity of the light signal returned by each filter bag, the detector not only can ensure the position of the broken filter bag, but also can ensure the size of a breakage position, so that a filtration chamber in which the filter bag is arranged can be automatically turned off according to the information, and alarm can be carried out. Therefore, the detector has the characteristics of non-contact, real time, telemetering and the like, and important parts such as the light source and the like can be far away from the high-temperature and high-pressure environment of the dust remover by an optical fiber, so that the environment requirement to a breakage detecting system can be reduced.

The invention discloses a liquid control valve apparatus used for a micro-fluidic chip and the micro-fluidic chip thereof. The valve apparatus comprises a detection mechanism used for sensing whether the liquid flows through an installation position of the valve apparatus; the feedback value from the detection mechanism shows that the liquid flows through the installation position of the valve apparatus, the valve apparatus in a normally-opened state in the micro-fluidic chip is capable of automatically closing and is in a cut-off state; the valve apparatus in the cutoff state is capable of timely opening and is in a circulation state; the fluid can be circulated in valve apparatus which is in the circulation state under promotion of air flow provided by air passage. The valve apparatus can switch the valve at any time, and can guarantee requirement of large scale production.

The invention discloses a detachable floater type water valve device. The floater type water valve device comprises a valve part and a floater part, and the valve part is separated from the floater part; the valve part is a check valve, and comprises a valve seat and a spool structure running through the center of the valve seat, and the lower end of the spool structure is provided with a cambered surface; the floater part comprises a pivotally arranged lever type floater structure, which comprises a floater at one side of a pivot and an abutting part at the other side of the pivot, and the end part of the abutting part is provided with a cambered surface, which correspondingly abuts against the cambered surface of the spool structure; and the floater can be rotated with the pivot as the axis according to the change of water level to drive the abutting part to slide to push the cambered surface of the spool structure, so that the valve part can be opened and closed. The detachable floater type water valve device utilizes the floater and the leverage to open and close the valve.

The invention relates to a refrigerator door handle, particularly to a magnetic attracting straight pull handle for self-closing a refrigerator door, wherein two open grooves (12) are formed at the two ends of each connecting rod (7) respectively, and screw holes (11) penetrating through the open grooves are formed at the two ends of each connecting rod; after the two draw bars (6) on a handle (3) penetrate a buckle plate (2), a refrigerator door (16) and a return spring (10), and the insert plates (4) at the other ends of the two draw bars are inserted into the open grooves (12) at the two ends of the connecting rods (7) and fixed by screws; a powerful magnet A (8) on a connecting rod magnet seat (9) faces to one side of the door frame of a refrigerator body (19), and a powerful magnet B (18) is arranged on the wall plate of the door frame of the refrigerator body (19) corresponding to the powerful magnet A. By utilizing the side-sliding absorbing structure of the powerful magnet A and the powerful magnet B, the cold air is prevented from being leaked outside from the closed refrigerator door, and the powerful magnet A and the powerful magnet B are utilized for opening / closing the refrigerator door with much ease.

The embodiment of the invention provides an ATO train control method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining the current speed, current position, current load and current command speed of a target train; according to the current speed, the current position, the current load, the current command speed and the slope information of the lineof the target train, obtaining the speed and load control quantity, the slope equivalent control quantity and the dynamic resistance control quantity; according to the speed and load control quantity, the slope equivalent control quantity and the dynamic resistance control quantity, obtaining the total control quantity, and outputting the level corresponding to the total control quantity. According to the ATO train control method and device, the electronic equipment and the storage medium provided by the embodiment of the invention, the speed and load control quantity, the slope equivalent control quantity and the dynamic resistance control quantity are fused to output the level, so that the fitting degree between the train and the command speed in the running process is better, the control deviation can be reduced, more accurate running control can be carried out, and the average traveling speed can be increased.

The invention discloses a thermal expansion valve with functions of a one-way valve. The thermal expansion valve comprises a valve body, wherein the valve body is provided with a first valve opening and a second valve opening, a valve seat of the valve body is provided with a valve core assembly which is matched with the valve seat, the valve core assembly comprises an expansion valve core and a one-way valve core, the one-way valve core is arranged on a guide sleeve of the expansion valve core, the guide sleeve is fixedly arranged on the valve body, and the one-way valve core is axially and movably arranged on the guide sleeve. When the thermal expansion valve works in the opposite direction, a medium guide passage for communicating the first valve opening and the second valve opening is formed between the one-way valve core and the valve seat. The thermal expansion valve has the advantages that the one-way valve core is axially and movably arranged on the guide sleeve; when the thermal expansion valve works in the opposite direction, the medium guide passage for communicating the first valve opening and the second valve opening is formed between the one-way valve core and the valve seat, so a plugging part is not needed, the structure of the thermal expansion valve core is simplified, and the assembly difficulty is reduced; the valve seat and the one-way valve core are axially and movably connected, so a fixing part is not needed, and the processing difficulty of the valve seat is favorably reduced.

The invention relates to a gate lock promoter, which comprises a first contact (1), a second contact (2), a controller (3), and a power supply (4), a timer (5) and a voice alarm device (6) which are respectively connected with the controller (3), wherein the first contact (1) is arranged on the outer metal surface of a lock catch (7), the second contact (2) is arranged in a lock hole of the lock catch (7), and the first contact (1) and the second contact (2) are insulated; one input point of the controller (2) is connected with a spring bolt (8); the power supply (4) can power up each device through the controller (3); the controller (3), the power supply (4) and the timer (5) are arranged in the gate lock, and the voice alarm device (6) is arranged on the surface of the gate lock. The gate lock promoter, provided by the invention, has the functions of actively monitoring whether a gate is accurately closed, and actively promoting.

The invention discloses a horizontal fixing device used for measuring an automobile thrust line. The horizontal fixing device comprises two fixing clamps which are connected with coaxial tires at two sides of an automobile, and is characterized in that a measuring rod is connected between the two fixing clamps, each fixing clamp comprises a supporting rod, a tire front tread fixing portion, a tire back tread fixing portion and a measuring rod connecting portion, the tire front tread fixing portion is fixedly arranged at the front part of the supporting rod, the tire back tire fixing portion is slidably arranged at the back part of the supporting rod, the measuring rod connecting portion is arranged at the end part, which is close to the tire front tread fixing portion, of the supporting rod, and two ends of the measuring rod are connected with the measuring rod connecting portions on the two fixing clamps respectively. The horizontal fixing device determines the position of a tire according to the tire tread, so that an actual and accurate tire position reference is acquired, the structure is simple, the operation is convenient, requirements for the processing precision of the fixing device itself are low, the determined measurement reference is more accurately close to the actual position of the tire, the measurement accuracy of the automobile thrust line is improved, and accurate adjustment for an automobile thrust angle in a later period is facilitated.

The invention relates to a refrigerator door handle, particularly to a magnetic attracting straight pull handle for self-closing a refrigerator door, wherein two open grooves (12) are formed at the two ends of each connecting rod (7) respectively, and screw holes (11) penetrating through the open grooves are formed at the two ends of each connecting rod; after the two draw bars (6) on a handle (3) penetrate a buckle plate (2), a refrigerator door (16) and a return spring (10), and the insert plates (4) at the other ends of the two draw bars are inserted into the open grooves (12) at the two ends of the connecting rods (7) and fixed by screws; a powerful magnet A (8) on a connecting rod magnet seat (9) faces to one side of the door frame of a refrigerator body (19), and a powerful magnet B (18) is arranged on the wall plate of the door frame of the refrigerator body (19) corresponding to the powerful magnet A. By utilizing the side-sliding absorbing structure of the powerful magnet A and the powerful magnet B, the cold air is prevented from being leaked outside from the closed refrigerator door, and the powerful magnet A and the powerful magnet B are utilized for opening / closing the refrigerator door with much ease.

The invention relates to a novel double-channel paper-feeding safety structure of a paper shredder, which comprises a paper shredder upper cover, a double-channel paper-feeding safety cover plate anda touch safety switch, wherein the double-channel paper-feeding safety cover plate is provided with a touch part, the paper shredder upper cover is provided with a paper feeding opening which corresponds to the double-channel paper-feeding safety cover plate and is positioned above a paper-shredding cutter shaft of the paper shredder, the double-channel paper-feeding safety cover plate is positioned in the paper feeding opening, the middle parts of two ends of the double-channel paper-feeding safety cover plate are rotatably connected with the paper shredder upper cover, the touch safety switch is fixed in the paper shredder upper cover and is matched with the touch part for setting the touch part to touch the touch safety switch when the double-channel paper-feeding safety cover plate isrotated to work, preferably, the middle parts of two ends of the double-channel paper-feeding safety cover plate are coupled with the paper shredder upper cover, the touch part is a touch cam wheel and comprises a work and standby limit structure, and the middle part of the double-channel paper-feeding safety cover plate is also provided with a light disk feeding channel. The novel double-channelpaper-feeding safety structure of the paper shredder has clever safety structure design, convenient use, safety and economy.

The invention provides an intelligent control method and control equipment for a home environment and a computer readable storage medium. The method comprises the following steps: receiving set values of environment parameters of a home environment by a user; then, obtaining real-time measurement values of the environmental parameters; and finally, when the difference value between the real-time measurement value and the set value exceeds a preset range and the state information of the user meets a preset condition, generating an instruction for controlling and adjusting the smart home equipment of the home environment, so that the smart home equipment starts adjustment of the home environment after receiving the instruction, and the home environment is adjusted, so that the real-time measured value reaches the preset parameter. Therefore, the smart home devices in the home environment can properly cooperatively work, the adjusted environment parameters are more matched with the real-time state of the user, and more comfortable home environment experience is brought to the user.

The invention relates to a handle, particularly to a magnetic attraction lever-type handle for self closing a refrigerator door, wherein one side surface of a fixed plate (14) is fixedly connected with a refrigerator body (3); a shaft (12) penetrates the shaft hole A (15) of an inverted n-shaped seat and the shaft hole B (19) at the corner of an L-shaped handle (8), so as to hinge the L-shaped handle with the inverted n-shaped seat; the short end of the L-shaped handle sequentially penetrates the opening (13) of the fixed plate, the opening of a refrigerator door, the opening of the sliding plate (10) arranged in the refrigerator door and a return spring (9) to be connected with a magnetic seat (6); a powerful magnet B (5) is arranged on the side of the magnetic seat facing to the door frame of the refrigerator door (1); and a powerful magnet A (4) is arranged on the plate wall of the door frame of the refrigerator door corresponding to the powerful magnet B. The cold is prevented from being leaked outside from the closed refrigerator door by utilizing the closed structure of the powerful magnet B and the powerful magnet A, and the refrigerator door is much easier to open by utilizing the lever principle.

The invention discloses a steel-wooden fireproof door and belongs to the field of fireproof doors. The technical scheme includes that the steel-wooden fireproof door comprises a door frame and a doorleaf, one side of the door leaf is hinged with the door frame while the other side is locked with the door frame through a fireproof lock, the door leaf includes opposite panels and a meshed wooden skeleton, the grid of the wooden skeleton is filled with perlite, a water circulation pipe set is embedded in the interior of the wooden skeleton, a spray pipe extending out of the inner side of the door leaf is arranged at the top of the water circulation pipe set, a guide plate is arranged on the inner side of the door leaf, a flow pipe is arranged near the hinge side of the door leaf and the doorframe and runs through the door frame to be exposed, an electromagnetic valve is arranged at one end penetrating the door frame, of the flow pipe, a pipeline connector is arranged at one end away from the flow pipe, of the electromagnetic valve, and a smoke sensor is fixed on the inner side of the door frame and is electrically connected with the electromagnetic valve. By the arrangement, the door leaf is cooled in case of fire, the deformation time is slowed down, and the time for people to escape is increased.

The invention discloses a major hazard source safety monitoring device which effectively solves the problem that in the prior art, emergency rescue personnel do not know the specific position where ammonia gas leakage occurs, and then rescue work of the emergency rescue personnel outside a production workshop is affected. The signal detection circuit transmits a signal detected by the ammonia gas sensor to the control processing circuit through the receiver and the amplifier, and the control processing circuit conducts the alarm circuit after the signal passes through the judger and transmits the signal to the monitoring center after the signal passes through the voltage stabilizer. A voltage stabilizing tube D1 is arranged in the signal detection circuit to detect whether the concentration in a storage workshop exceeds a standard value or not at the moment, and a judger and a triode Q5 are used in a control processing circuit to control conduction of a relay K1, so the working state of an ammonia compressor U2 is controlled; therefore, the ammonia compressor U2 can be immediately turned off when the concentration of ammonia gas in a production workshop exceeds the standard.

This vehicle door lock apparatus is provided with: a housing having an opening; a linking member configured in such a manner as to be linked to an operating mechanism disposed in a door; an operating lever that is positioned inside the housing, passes through the opening, and links to the linking member; and a cover that is capable of opening and closing the linking location of the linking member and the operating lever, and the opening. The cover is configured separately to the housing, and is attached in such a manner as to able to be attached to and detached from the housing, and to be able to rotate between an open state and a closed state. On the housing and the cover are disposed: a temporary fixing mechanism for temporarily holding the cover in an open state when the cover is rotatably attached to the housing; and a holding mechanism for holding the cover in a closed state.

The invention discloses a fireproof wooden door capable of resisting impact force and preventing deformation. The fireproof wooden door comprises a fireproof lock, a door leaf, a door closer, a door frame, fireproof hinges and fireproof sealing strips, wherein the fireproof hinges are arranged at upper and lower ends of one side wall of the door leaf; the door frame is fixedly arranged in a wall;the door leaf is fixedly arranged on a jamb of the door frame through the fireproof hinges and comprises a veneer, a fireproof board, expanded perlite boards, wooden framework bearing frames, framework separation materials, wooden framework rail materials and a lock holder; two wooden framework bearing frames are arranged; the expanded perlite boards fill among the framework bearing frames, the framework separation materials and the wooden framework rail materials in the door leaf; the fireproof board is glued to the two sides of the outer surfaces of the expanded perlite boards by glue; and the fireproof lock is arranged at the middle end of the door leaf. The door leaf and the door frame structure are simple and light, and labor is saved during daily opening and closing; and the thickness and strength of the door leaf and the door frame are improved, the fireproof performance is high, and the thermal insulation and fireproof functions are good.

The invention discloses an air sealing structure. The air sealing structure comprises a bin gate, a limit frame and a sealing frame. The sealing frame is fixed to the outside of the limit frame, the sealing frame and a sealing platform on the bin gate are assembled in a sealing mode, an air inflation cavity is formed in the sealing frame, and the air inflation cavity communicates with one end of an air inflation pipe. The air sealing structure further comprises a secondary sealing frame, a secondary air inflation cavity is formed in the secondary sealing frame, the air inflation cavity communicates with the secondary air inflation cavity through an inner connecting pipe, a pressurizing cavity is formed between the sealing frame and the secondary sealing frame, and the pressurizing cavity communicates with one end of a forcing pipe. The invention further discloses a self-service bank which applies the air sealing structure. The air sealing structure can carry out triple sealing by the sealing frame, the secondary sealing frame and the pressurizing cavity, so that a preferable sealing effect can be obtained in a cavity body, the self-service bank can resist water logging, flood and the like, and areas with more rainwater and big flood are adapted.

The invention discloses an air-conditioner indoor unit and an air-conditioner. The air-conditioner indoor unit comprises a housing, a guide block, a driving motor, a driving gear, a driven gear and a door body. The housing is provided with an air inlet, an air outlet and an air channel located between the air inlet and the air outlet, and comprises a panel support, and the air outlet is formed in the panel support; the guide block is arranged on the panel support corresponding to the top and / or the bottom of the air outlet, and the side, facing the air outlet, of the guide block is provided with a guide column; the driving motor is arranged on the portion, close to the guide block, on the panel support at the top and / or the bottom of the air outlet; the driving gear is fixedly connected with a rotation shaft of the driving motor; the driven gear is arranged at the side, close to the air outlet, of the driving gear, and is provided with a guide groove, and the guide column extends to the inside of the guide groove; the top and / or the bottom of the door body is fixedly connected with the driven gear to make the door body open and close the air outlet with the rotation of the driving motor. In the air-conditioner indoor unit and the air-conditioner, through the arrangement of the guide column and the guide groove, the door body is more accurately and more stably moved.

The invention discloses a road target detection and association method based on millimeter-wave radar and vision. The method comprises the following steps: 1, installing the millimeter-wave radar and a camera on a vehicle; 2, constructing an improved YOLOv3 network which comprises a main body network and three feature prediction layers, and constructing a loss function and training the network based on DIOU so as to obtain a trained visual detection model; 3, configuring parameters of the millimeter-wave radar, acquiring CAN signals by using the configured millimeter-wave radar, processing the CAN signals, outputting preset frames with different target preset lengths and widths for the millimeter-wave radar, and projecting the preset frames back to a pixel coordinate system; and 4, calculating cost values of the radar target preset frame and the visual target frame through a DIOU-based cost calculation method, and setting a reasonable threshold value for optimization solution through a Hungary algorithm to obtain a global optimal matching result. According to the method, the correlation precision of the millimeter wave radar detection target and the visual detection target can be improved, so that richer target information can be obtained.

The invention discloses an elevator door lock assembly, which comprises a door lock body, a lock plate, a locking mechanism, a control mechanism, wherein the locking mechanism comprises an electromagnet, a locking pin and a spring; the locking pin and the lock plate are rotatably connected; the electromagnet is electrically connected with the control mechanism; before a car arrives, the lock plate is clamped and fixed on a catch plate, and an elevator landing door is in a locked state; after the car arrives, a car arrival signal is transmitted to a control system by a leveling inductor of an elevator; a landing call signal and a leveling inductor signal are combined by the control system to accurately output an unlocking signal to the electromagnet of the floor; after the electromagnet is electrified, the locking pin is sucked up; the lock plate is driven by the locking pin to do anticlockwise rotation; a bayonet is separated from the catch plate, and the landing door is opened; when the car leaves, a signal is output to the electromagnet by the control mechanism; the electromagnet is interrupted, the locking pin resets under the effect of gravity of the spring or the locking pin; the lock plate rotates to reset; the bayonet is clamped on the catch plate to realize the linkage of the landing door and the car so as to realize accurate opening and closing on the landing door.

The invention discloses a multifunctional automatic range hood control system, which is characterized by being mainly formed by a center processor, a power supply, an A / D analog-digital converter, a motor, an alarm, a smoke sensor, a three-terminal voltage stabilizing filter circuit, a lowpass filtering amplifying circuit and a trilinear buffering driving circuit, wherein the A / D analog-digital converter, the motor and the alarm are all connected with the center processor; the smoke sensor is connected with the A / D analog-digital converter; the three-terminal voltage stabilizing filter circuit is connected in series between the power supply and the center processor; the lowpass filtering amplifying circuit is connected in series between the smoke sensor and the A / D analog-digital converter; and the buffering circuit is connected with the driving circuit. The multifunctional automatic range hood control system can accurately collect the concentration value of oil smoke, and accurately control the range hood to automatically turn on or off, thus providing a good living environment for people.

The invention provides a magnetic suction automatic door closing pulling splitting type pull handle for refrigerator and relates to a refrigerator door pull handle. A handle seat (6) is arranged on one side surface of a fixing plate (4), the other side surface of the fixing plate is fixedly connected with a refrigerator door, a convex block (8) arranged at the upper end of a handle (12) is movably hinged in a small opening through a screw (1), an insertion rod (10) sequentially passes through a baffle plate (17) and a spring (16), then, a D-shaped screw rod (18) arranged on a magnet seat (7) is inserted into a D-shaped hole (9) and is then fixed through a screw nut (13), a strong force magnet A (19) arranged on the magnet seat faces one side of a door frame of a refrigerator body (25), and a strong force magnet B (24) arranged on the plate wall of a refrigerator body door frame in a position corresponding to the strong force magnet A. The closing structure adopting the strong force magnet A and the strong force magnet B is utilized, so the closed refrigerator door cannot generate outward flowing of cold air, the opening and closing of the strong force magnet A and the strong force magnet B is realized by using the handle when the refrigerator door is opened, and the opening is easy.

The invention provides a control method and a control system for displaying a right blind area image of a vehicle, which relate to the vehicle image display control field. Obtain the state of the right blind button and the state of the steering lever; Based on the matching relationship between the vehicle speed and the preset speed value, as well as the state of the right blind area button and thestate of the steering lever. The invention solves the problem that the control method of the right blind area camera in the prior art is single and cannot meet the user's demand for humanized use ofthe vehicle.

The invention provides a container control device, a container control method, and a container. The control device comprises a frequency setting unit used for setting a frequency at which an ultrasonic distance measuring unit sends ultrasonic wave, the ultrasonic distance measuring unit used for sending ultrasonic wave to measure distance according to a first frequency or a second frequency set by the frequency setting unit, and a control unit used for controlling the container according to the distance measurement information of the ultrasonic distance measuring unit. By using the scheme, container lid opening and closing can be controlled more accurately and more flexibly.

The invention relates to an intelligent mine centralized control cabinet which comprises a cabinet body and a cabinet door, an industrial personal computer, buttons and signal lamps are installed on the cabinet door, button lamps are arranged on the buttons, a switch connected with the industrial personal computer is installed in the cabinet body, and the switch is connected with a T60S2R-e type PLC, a CBOX and a TVBOX through Ethernet cables; the T60S2R-e type PLC is connected with an intermediate relay and a Raspberry Pi, the T60S2R-e type PLC transmits a starting signal to the intermediaterelay, and meanwhile, the intermediate relay feeds back a signal indicating whether ore transportation mechanical equipment is successfully started or not to the T60S2R-e type PLC; the T60S2R-e type PLC is also used for receiving a heat relay dry-hardening point signal, a communication signal and a motor current signal; and the intermediate relay is electrically connected with the button lamps andthe signal lamps. The starting and stopping of all ore transportation mechanical equipment are centralized on the centralized control cabinet, the integration degree is high, the operation is easy, the occupied area of the cabinet is small, the wiring is simple, and the maintenance is convenient.

The invention discloses a flip drainer service life testing device and method, the device comprises a mounting body and a switch driving mechanism, the mounting body is provided with a mounting port for mounting a flip drainer, and the switch driving mechanism is provided with a first driving part and a second driving part which can stretch out and draw back automatically. When the first driving part extends out, the turning cover of the turning cover drainer mounted at the mounting opening is driven to be opened, and when the second driving part extends out, the turning cover of the turning cover drainer mounted at the mounting opening is driven to be closed. According to the invention, the service life of the flip drainer can be tested by controlling the automatic switch of the flip drainer, so that the service life information of the flip drainer can be accurately obtained, and the blank that no flip drainer service life testing equipment exists in the market at present is filled.

The invention discloses an energy-saving control based on hybrid multiple circuits for a range hood. The energy-saving control system is characterized by being mainly composed of a central processing unit, a power supply, an A / D (analogue / digital) converter, a motor and an alarm which are all connected with the central processing unit, a smoke sensor connected with the A / D converter, a logic gate protection circuit serially connected between the central processing unit and the alarm, a three-terminal voltage-stabilizing and filtering circuit serially connected between the power supply and the central processing unit, and a trilinear buffer and drive circuit serially connected between the central processing unit and the motor. The control system for the intelligent domestic range hood, which is disclosed by the invention, is capable of accurately acquiring a concentration value of lampblack, and accurately controlling the range hood to be automatically turned on or off, thus providing a good living environment for people.

The invention discloses an energy-saving control system based on a compound band-pass filtering and amplifying circuit and used for a range hood. The energy-saving control system is mainly composed of a central processing unit, an analogue / digital (A / D) converter, a motor, an alarm, a display, a power supply, a smoke sensor, a signal anti-interference processing circuit and an active rectifying, filtering and voltage-stabilizing circuit, wherein the A / D converter, the motor, the alarm, the display and the power supply are all connected with the central processing unit, the smoke sensor is connected with the A / D converter, the signal anti-interference processing circuit is serially connected between the smoke sensor and the A / D converter, and the active rectifying, filtering and voltage-stabilizing circuit is serially connected between the power supply and the central processing unit. The energy-saving control system is characterized in that the band-pass filtering and amplifying circuit is further serially connected between the A / D converter and the central processing unit; and the band-pass filtering and amplifying circuit is composed of a signal amplifying circuit and a signal filtering and amplifying circuit. The control system for the intelligent domestic range hood, which is disclosed by the invention, is capable of accurately acquiring a concentration value of lampblack, and accurately controlling the range hood to be automatically turned on or off, thereby providing a good living environment for people.

The invention discloses an engine oil drainage valve. The engine oil drainage valve comprises an oil drainage base, a valve body, a spring and a clamping ring, wherein the oil drainage base is of a hollow structure and comprises an inlet section and a cylinder section, a mounting base of the oil drainage base is arranged at the inlet section, two sets of screw mounting holes are formed in the mounting base, a set of mounting grooves are formed in the inlet section, the mounting groove is of an annular groove structure and is used for mounting a clamping ring, an inner cavity A, an inner cavity B and an inner cavity C are formed in the column body section, the inner cavity A is used for mounting a valve, the inner cavity B is used for mounting a spring, and the inner cavity C is used for providing a flow path for residual oil. By means of the design structure for sealing by the spring and a conical face, the instant, accurate and reliable switch-off of the oil drainage valve can be realized, and free switching of switch-on or switch-off of the oil drainage valve can be realized.