32results about How to "High precision of automatic control" patented technology

The invention relates to an automatic driving device for an intelligent vehicle. The device comprises an automatic driving actuating mechanism and a control system, the automatic driving actuating mechanism comprises a steering actuating mechanism, a brake actuating mechanism, an accelerator actuating mechanism and a gear actuating mechanism, and the control system comprises a decoder, a serial communication unit, a single chip microcomputer, a CAN (controller area network) interface, a data storage unit, a reset circuit and a power conversion unit. By the aid of modular design, a steering module is directly and additionally mounted on a steering wheel through an upper steering wheel fixture and a lower steering wheel fixture in a synchronous belt transmission mode, the driving performance of an original vehicle cannot be affected as the original vehicle is slightly modified, the automatic driving device is applicable to various vehicle types with different steering wheel sizes, a brake module, an accelerator module and a gear module control states of a brake, an accelerator and gears as a direct current servo motor drives a ball screw to pull a flexible shaft, and manual driving cannot be affected. Four actuating modules are connected by a CAN bus, so that the automatic driving device is high in automatic control accuracy and fast in response.

The invention discloses a preparation method of a low air-entraining type solid polycarboxylic acid water reducing agent. A benzene ring with a rigid structure, an amide group and an ethylene oxide / epoxypropane polyether amine structure with a defoaming structure are introduced by an amidation method, so that the finally synthesized water reducing agent has good water-reducing, slump retaining andlow air-entraining effects and effectively enhances the durability of concrete; and the low air-entraining type solid polycarboxylic acid water reducing agent adopts a microwave heating method, and is high in heating speed, simple to operate, high in automatic control precision, clean and pollution-free. The polycarboxylic acid water reducing agent synthesized by a body polymerization method doesnot contain an organic solvent capable of polluting environment, has high molecular structure controllability and is environment-friendly and pollution-free.

The invention discloses a direct current micro voltage / micro current detection device and a detection method thereof. The detection device comprises an oscillation circuit, a digital signal amplifying circuit, a subtractor and a numerical value scaling unit, wherein the oscillation circuit comprises a first voltage-controlled oscillator and a second voltage-controlled oscillator, the parameters of the first voltage-controlled oscillator and the second voltage-controlled oscillator are the same, the input of the first voltage-controlled oscillator is connected with the output end of a signal to be detected or is grounded, the input of the second voltage-controlled oscillator is grounded or is connected with the output end of the signal to be detected, the output of the first voltage-controlled oscillator and the output of the second voltage-controlled oscillator are respectively connected with the input of the digital signal amplifying circuit; the output of the digital signal amplifying circuit is connected with the input of the subtractor, and the output of the subtractor is connected with the input of the numerical value scaling unit. The method comprises the following steps: the detection device respectively converts an input signal into oscillation frequencies by the first voltage-controlled oscillator and the second voltage-controlled oscillator, and amplifying, subtracting and conversion are carried out, so as to judge whether a direct current micro voltage or direct current micro current is input or not.

The invention discloses a hydraulic servo buffer capable of achieving active control. The hydraulic servo buffer is characterized in that a low-pressure energy accumulator with a switch valve is connected with a hydraulic constant delivery pump with a motor, the hydraulic constant delivery pump is connected with an inlet of a one-way valve, an outlet of the one-way valve is connected with an oil inlet of a hydraulic servo valve with a hydraulic servo amplifier, an oil return port of the hydraulic servo valve is connected with an oil outlet of the low-pressure energy accumulator, two ports of an oil outlet of the hydraulic servo valve are connected with two oil inlets of a hydraulic lock, oil outlets of the hydraulic lock are connected with a rodless cavity and a rod cavity of a hydraulic cylinder respectively, and a pressure sensor is arranged on a pipeline which enables the hydraulic lock and the rodless cavity to be connected; and a displacement sensor is arranged on a piston rod inthe hydraulic cylinder, the outer end of the piston rod of the hydraulic cylinder is hinged to a sliding block through a spherical hinge, and the sliding block is arranged on a guide rail corresponding to the sliding block. According to the hydraulic servo buffer capable of achieving active control, the responding speed and the control precision are high, specified loads are applied to a system, and then the requirements of some high-grade, precision and advanced special occasions on load reducing are achieved.

The invention discloses a preparation method for slow-release polycarboxylate water reducer. An amidation method is adopted to introduce a benzene ring, an amido group and an acylamino group of a rigid structure, meanwhile, carboxyl and an ester group are contained, the polycarboxylate water reducer which is finally synthesized has an excellent water reduction dispersion effect and slump protection effect, and in addition, the polycarboxylate water reducer has high adaptation for different varieties of gel materials; a microwave heating method is adopted, and therefore, the slow-release polycarboxylate water reducer has the advantages of high heating speed, simpleness in operation, high automation control accuracy, cleanness and no pollution; the polycarboxylate water reducer synthesized with a bulk polymerization method does not contain organic solvent which pollutes environment, is high in molecular structure controllability and is environmentally friendly and pollution-free.

The invention provides a hot rolling mill AGC system and a rolling control method thereof, belongs to the field of hot rolling mill AGC control and aims at solving the problem that at present, the hot rolling mill AGC system is low in control accuracy, insensitive in reaction and low in plate thickness control accuracy and influences constant pressure of a device. The model of a pressure sensor of the hot rolling mill AGC system is TIM0050302911201, and the pressure sensor is arranged in the oil cylinder of the hot rolling mill AGC system. The pressure sensor is the TIM0050302911201 pressure sensor modified according to set calibration parameters and is used for acquiring pressure in the oil cylinder of the hot rolling mill AGC system and feeding the pressure serving as a control parameter back to a hydraulic servo system of the hot rolling mill AGC system. The hot rolling mill AGC system is used in a hot rolling mill.

The invention belongs to the metal rolling field and discloses a post-rolling fast cooling system for on-line solution treatment of steel plates. According to the system, rolling heat left after the steel plates are rolled is utilized, a compact top and bottom inclined spraying type fast cooling device is installed between a heat straightening machine and a cooling table for conducting the on-line solution treatment on the steel plates, the steel plates are uniformly cooled, and the cooling process is accurately controlled in a full-automatic mode. The investment of the fast cooling system is small, the cooling device is compact and saves the energy, the cooling rate is high, the thickness specification range of the steel plates capable of undergoing controlled cooling is wide, the automatic control accuracy is high, the shapes of the plates after being cooled are good, and carbon emission and tremendous energy consumption caused by off-line heat treatment and secondary heating can be reduced. The system can be widely applied to the cooling process after the steel plates are rolled and the production control field.

The invention relates to a multi-layer photographing method and photographing system for microscopic examination. The system comprises a rack, a stage, an objective lens group and a camera. The objective lens group comprises two or more objective lenses of different optical lengths and is rotatably mounted on the rack by switching the objective lenses. The stage and the camera are respectively mounted on the rack right under and right above the objective lens group. The stage is mounted on the rack in such a manner that the stage can be moved horizontally with the shooting position adjustable. A lens of the camera is combined with the different objective lenses subjected to rotational switching to focus on different levels of a mixed microscopic examination liquid in a counting pool of the stage. In this way, by changing the optical length of the objective lenses, multi-level objects in the counting pool are photographed, without any need of adjusting the stage; low machining precision is required, and the method is easy to achieve with high control accuracy; the detection speed and shooting clarity are greatly improved; the photographing system is simple in structure, long in service life, stable in performance, convenient for operation, and good for promotion and application.

The invention relates to a plate shape control method for online solution treatment of steel plates and belongs to the technical field of metallurgy. The plate shape control method is used for solving the bottleneck problem that the shapes of steel plates are poor in the application of online solution treatment technology. An overall rolling type oblique spraying cooling device and a follow-up type upper compression roller system capable of blocking water are designed. A reverse steel throwing technique is adopted, a three-dimensional full flow control technology is applied, and the good plate shapes of the steel plates subjected to online solution treatment are ensured in the process of cooling after rolling. The plate shape control method can not only be used for online solution treatment of the steel plates but also be applied to the process needing quick cooling after rolling and even the off-line quenching process. The plate shape control method can be widely applied to the field of cooling processes and production control after the steel plates are rolled.

The invention discloses a handheld holder control method and a handheld holder. The handheld holder comprises a handle and a holder arranged on the handle, and the method comprises the following steps: when the holder enters a motion state, obtaining the posture of the handle; determining a first included angle between a first axis direction and a vertical direction in a coordinate system of the handle and / or a second included angle between a second axis direction and the vertical direction in the coordinate system of the handle according to the posture of the handle; determining an expected shooting mode of the cradle head according to the first included angle and / or the second included angle, wherein the expected shooting mode comprises one of an upper flashlight mode and a vertical shooting mode; controlling the holder to enter an expected shooting mode; when the handheld holder is vertically placed, the first axis direction and the second axis direction are orthogonal to the vertical direction. According to the handheld holder control method and the handheld holder, the function that the holder directly enters the flashlight feeding mode or the vertical shooting mode when entering the motion state is achieved, extra operation of a user is not needed, the automatic control precision and efficiency of the holder are high, and the use requirements of the user can be better met.

The invention relates to an energy-saving middle-frequency-inverting automatic gang bonder with multiple transformers. The energy-saving middle-frequency-inverting automatic gang bonder comprises a power-frequency power supply, a plurality of bonding heads, a three-phrase rectifier, an energy-storage capacitor, a middle-frequency inverter, a plurality of tapped middle-frequency transformers and a plurality of middle-frequency rectifiers. A controller is connected with the three-phrase rectifier, the energy-storage capacitor, the middle-frequency inverter and the tapped middle-frequency transformers respectively. The energy-saving middle-frequency-inverting automatic gang bonder can control gang bonding at multiple points accurately, can perform gang bonding simultaneously, and has the advantages of small size, high power factor, high power efficiency, low energy consumption and the like.

The invention relates to a hydraulic synchronous jacking system which comprises four main oil cylinders, a console, a programmable controller, a switching power supply and eight electromagnetic reversing valves, wherein a proportional reversing valve, four upper bolt oil cylinders, four lower bolt oil cylinders and an opening device are arranged on each main oil cylinder; each electromagnetic reversing valve is used for controlling the four upper bolt oil cylinders or the four lower bolt oil cylinders on the same main oil cylinder; an encoder is arranged on each opening device, and output signal interfaces of the encoders are connected with a signal input interface of the programmable controller and the signal input interface of a touch screen; and the hydraulic synchronous jacking system further comprises an oil pump motor for controlling the main oil cylinders, the upper bolt oil cylinders and the four lower bolt oil cylinder. According to the hydraulic synchronous jacking system disclosed by the invention, the four main oil cylinders are adopted, each main oil cylinder is equipped with the four upper bolt oil cylinders and the four lower bolt oil cylinders, and stable and firm support of the system is ensured; and the programmable controller is adopted, and automatic synchronous control of the system can be realized by controlling the oil pump motor, the proportional reversing valves and the electromagnetic reversing valves.

The invention discloses an efficient cultivation device based on salt-tolerant plant lycium ruthenicum. The device comprises a bottom plate and a cultivation box fixedly connected to the top of the bottom plate through supporting legs, a vertical plate is fixedly connected to the middle of the bottom of the inner wall of the cultivation box, and a supporting plate is fixedly connected between theopposite sides of the two supporting legs; a driving assembly is arranged at the top of the supporting plate, and a sprinkling irrigation assembly is arranged at the position, located at the bottom ofthe supporting plate, of the top of the bottom plate; and the sprinkling irrigation assembly comprises a water tank. The invention relates to the technical field of lycium ruthenicum cultivation. According to the efficient cultivation device and method based on the salt-tolerant plant lycium ruthenicum, personnel can automatically set the water amount and interval irrigation of irrigation water according to the growth condition of lycium ruthenicum seedlings, manual timing and quantitative irrigation is not needed, the problems that the personnel forget to water and the watering amount is toolarge are solved, the survival rate of the lycium ruthenicum seedlings is guaranteed, the working intensity of personnel is reduced, the automatic control precision is high, and the actual use condition is met.

The invention relates to the online heat treatment technology for steel pipe production, in particular to a basic automatic control system and control method for steel pipe online cooling. After the basic automation control system for the steel pipe online cooling receives the setting information sent by a process control computer for the steel pipe online cooling, through mutual coordination of systems and strict logic control, and the steel pipe online cooling process is fully automatic and accurately controlled. The systems mainly include a basic control system for a steel pipe online cooling production device, a water supply system, and a hydraulic system. The steel pipe online cooling production device is in parallel with a steel pipe original rolling line system, the steel pipe online cooling production device has a wide range of adjustable temperature drop, the controllable cooling steel pipe has a large wall thickness specification, automatic control accuracy is high, and pipeshape after cooling is good; not only can be used to achieve flexible process requirements of the steel pipe online cooling, but also the offline quenching process requirement of the steel pipe can beachieved, and stable production and smooth operation are ensured.

The invention relates to an automatic driving device for an intelligent vehicle. The device comprises an automatic driving actuating mechanism and a control system, the automatic driving actuating mechanism comprises a steering actuating mechanism, a brake actuating mechanism, an accelerator actuating mechanism and a gear actuating mechanism, and the control system comprises a decoder, a serial communication unit, a single chip microcomputer, a CAN (controller area network) interface, a data storage unit, a reset circuit and a power conversion unit. By the aid of modular design, a steering module is directly and additionally mounted on a steering wheel through an upper steering wheel fixture and a lower steering wheel fixture in a synchronous belt transmission mode, the driving performance of an original vehicle cannot be affected as the original vehicle is slightly modified, the automatic driving device is applicable to various vehicle types with different steering wheel sizes, a brake module, an accelerator module and a gear module control states of a brake, an accelerator and gears as a direct current servo motor drives a ball screw to pull a flexible shaft, and manual driving cannot be affected. Four actuating modules are connected by a CAN bus, so that the automatic driving device is high in automatic control accuracy and fast in response.

The invention relates to the technical field of automatic control, in particular to an automatic coal gas station load control system. The control system comprises a high-pressure coal gas pressure control loop, a low-pressure coal gas pressure control loop and an amplitude limiter. After a low-pressure coal gas pressure set value and actual pressure data collected by a low-pressure coal gas pressure transmitter are subjected to comparison operation through a low-pressure coal gas pressure regulator, a signal is outputted to a blower frequency converter, a blower is controlled to regulate air volume to further control pressure of a low-pressure coal gas main, meanwhile the low-pressure coal gas pressure transmitter transmits measured low-pressure coal gas pressure information to the high-pressure coal gas pressure control loop through the amplitude limiter, pressure regulation of the high-pressure coal gas pressure control loop is subjected to amplitude limitation, the two control loops restrict each other during pressure regulation, safety in the whole control process is guaranteed, potential risk that the low-pressure coal gas pressure is ultrahigh and ultralow due to frequent change of coal gas demand of users is eliminated, and stable regulation of coal gas production is realized.

The invention relates to a steel wire heat treatment open-fire heating furnace with a column combined type preheater. The preheater is arranged in a smoke discharging flue and comprises a hot air tank and a cold air tank, which are communicated through a connecting vent pipe, and the hot air tank and the cold air tank are respectively partitioned into multiple chambers by partition boards. Each chamber of the hot air tank is respectively communicated with each chamber of the corresponding cold air tank through the connecting vent pipe, each chamber of the hot air tank is respectively providedwith a hot air pipe, and each hot air pipe is communicated to each section of the open-fire heating furnace. Each chamber of the cold air tank is respectively provided with a cold air pipe, each coldair pipe is communicated with a cold air header pipe, and a cold air valve is arranged on each cold air pipe. In the invention, the air quantity of each working section of the open-fire heating furnace is controlled by adjusting the air quantity entering each cold air pipe of the preheater, and the cold air valve works at normal temperature, is easy to realize automatic control and has high automatic control accuracy. The utilization rate of heat energy is high, the thermal stability of the furnace is good, and produced steel wires have good quality.

The invention discloses a method and device for controlling a precision treatment separation tower separating tower resin separation auxiliary backwashing water incoming regulating valve. The method includes the following steps: S1, obtaining the real-time flow information of the backwashing incoming water of the separation tower and send the real-time flow information to a PLC; S2,causing the PLCto generate a regulating valve control instruction according to a preset time-dependent adjustment rule and the real-time flow information; S3, causing the regulating valve to adjust the flow of incoming water according to a received regulating valve control instruction; and S4, repeating the steps S1 to S3 until the end of the current resin separation process. The method acquires the incoming water flow information of the regenerated separation tower, sends the flow information to the PLC, introduces the flow information into the configuration logic, introduces time parameters into the resinseparation control, and performs adjustment and control according different requirements for the flows at different times, thereby realizing the closed loop control of the incoming water flow at different times, improving the accuracy of the automatic flow control and improving the separation effect of the resin.

The invention provides a feed-forward control method, a feed-forward industrial personal computer and a system for sliding steerable drilling, and the method comprises the steps: building a multi-body dynamic segmentation model of a sliding steerable drilling system according to well track design parameters inputted by a user; according to historical actual drilling data, stratum parameters in the dynamic segmentation model are updated; according to the drilled trajectory parameters and the borehole trajectory design parameters, deflection parameters of the target trajectory are obtained through calculation; a drilling process is simulated according to the BHA multi-body dynamic model and the deflection parameters of the target trajectory, and target shooting is carried out to obtain segmented point target control quantity; a balance process is simulated according to the drill rod multi-body dynamic model and the segmented point target control quantity, and a drilling machine feedforward control quantity is obtained through targeting; the drilling machine feedforward control quantity is sent to a drilling machine controller; and judging whether the drilled distance reaches the expected length or not, and if not, returning to continue to execute updating of the stratum parameters and the following steps. According to the invention, accurate, real-time and efficient sliding guide automatic drilling can be realized.

The invention relates to the technical field of self-adhesion aluminum-plastic composite foil, in particular to production equipment of self-adhesion aluminum-plastic composite foil. By means of the combination design of an adhesive coating unit, an extrusion melting unit and a tape-casting laminating unit, the problems that existing production equipment for self-adhesion aluminum-plastic composite foil is single in function, production of aluminum-plastic foil and self-adhesion films can not be controlled, consequently, the production cost is difficult to control, and produced self-adhesion aluminum-plastic composite foil is thick are solved.

The invention relates to the technical field of self-adhesion aluminum-plastic composite foil, in particular to production equipment of self-adhesion aluminum-plastic composite foil. By means of the combination design of an adhesive coating unit, an extrusion melting unit and a tape-casting laminating unit, the problems that existing production equipment for self-adhesion aluminum-plastic composite foil is single in function, production of aluminum-plastic foil and self-adhesion films can not be controlled, consequently, the production cost is difficult to control, and produced self-adhesion aluminum-plastic composite foil is thick are solved.

A hand-held pan-tilt control method and a hand-held pan-tilt, the hand-held pan-tilt includes a handle and a pan-tilt arranged on the handle, the method includes: when the pan-tilt enters a motion state, acquiring the attitude of the handle; according to the attitude of the handle, determining The first included angle between the first axis direction and the vertical direction in the coordinate system of the handle and / or the second included angle between the second axis direction and the vertical direction in the handle's coordinate system; according to the first included angle and / or The second included angle determines the desired shooting mode of the pan-tilt, and the desired shooting mode includes one of the upper flashlight mode and the vertical mode; the control pan-tilt enters the desired shooting mode; wherein, when the handheld pan-tilt is placed upright, the first axis direction, the second axis direction and the vertical direction are orthogonal. The hand-held pan-tilt control method and the hand-held pan-tilt of the present invention realize the function of directly entering the upper flashlight mode or the vertical shooting mode when the pan-tilt enters the motion state, without additional operation by the user, and the pan-tilt is automatically controlled with high precision and high efficiency, and is more in line with User needs.

The invention belongs to the metal rolling field and discloses a post-rolling fast cooling system for on-line solution treatment of steel plates. According to the system, rolling heat left after the steel plates are rolled is utilized, a compact top and bottom inclined spraying type fast cooling device is installed between a heat straightening machine and a cooling table for conducting the on-line solution treatment on the steel plates, the steel plates are uniformly cooled, and the cooling process is accurately controlled in a full-automatic mode. The investment of the fast cooling system is small, the cooling device is compact and saves the energy, the cooling rate is high, the thickness specification range of the steel plates capable of undergoing controlled cooling is wide, the automatic control accuracy is high, the shapes of the plates after being cooled are good, and carbon emission and tremendous energy consumption caused by off-line heat treatment and secondary heating can be reduced. The system can be widely applied to the cooling process after the steel plates are rolled and the production control field.

The invention relates to a converter gas dry method bag-type recovering and purifying process system. A waste heat boiler is connected with a water-cooling flue; the two ends of a primary waste heat boiler are connected with the water-cooling flue and an atomizing cooler respectively; the atomizing cooler is connected to a secondary waste heat boiler through a cinder cooler; the inlet of the secondary waste heat boiler is connected with a gas mixer through a heating valve bank; the secondary waste heat boiler is connected with a by-pass blower and the gas mixer respectively by a three way valve; the gas mixer is connected to a plurality of dry method bag-type dust removers; the dry method bag-type dust removers are connected with a gas blower; the gas blower is connected to a clean gas cooler; the clean gas cooler is connected to a gaspipe network; the clean gas cooler and the gas mixer are connected by a pipeline and the heating valve bank; a low speed valve bank is arranged between the inlet and the outlet of the gas blower; the bottom of the cinder cooler and the bottom of each dry method bag-type dust remover are connected with totally-enclosed cinder conveyers respectively; and the totally-enclosed cinder conveyers are connected with a cinder storage bin. The converter gas dry method bag-type recovering and purifying process system of the invention is capable of controlling the dust concentration of gas under 5mg / Nm3.

The invention relates to a method for establishing an intelligent water adding model for a loosening and moisture regaining process of a tobacco shred making workshop. The method comprises the following steps: providing uniform tobacco blocks after slicing for the loosening and moisture regaining process; the delay accuracy of the water adding time of a material head inlet and a material head outlet is adjusted; a control model based on the change trend and deviation of the moisture content at the outlet of the loosening and moisture regaining roller; an angle actuator is mounted on the hot air return pipeline; adjusting a steam-water coefficient according to the water content of the material; closed-loop control of a water adding system is achieved to quickly and timely respond to changes of water content at an outlet of the loosening and moisture regaining roller. According to the technical scheme, the mode that the water adding amount is automatically matched according to the supplied material moisture value is achieved, process fluctuation is reduced, the water adding accuracy and uniformity are improved, the stability of moisture content control is promoted, and the moisture content standard deviation, the qualified rate and the CPK value of loose and dampened export tobacco leaves are improved.

The invention relates to a plate shape control method for online solution treatment of steel plates and belongs to the technical field of metallurgy. The plate shape control method is used for solving the bottleneck problem that the shapes of steel plates are poor in the application of online solution treatment technology. An overall rolling type oblique spraying cooling device and a follow-up type upper compression roller system capable of blocking water are designed. A reverse steel throwing technique is adopted, a three-dimensional full flow control technology is applied, and the good plate shapes of the steel plates subjected to online solution treatment are ensured in the process of cooling after rolling. The plate shape control method can not only be used for online solution treatment of the steel plates but also be applied to the process needing quick cooling after rolling and even the off-line quenching process. The plate shape control method can be widely applied to the field of cooling processes and production control after the steel plates are rolled.

The invention relates to a steel wire heat treatment open-fire heating furnace with a column combined type preheater. The preheater is arranged in a smoke discharging flue and comprises a hot air tank and a cold air tank, which are communicated through a connecting vent pipe, and the hot air tank and the cold air tank are respectively partitioned into multiple chambers by partition boards. Each chamber of the hot air tank is respectively communicated with each chamber of the corresponding cold air tank through the connecting vent pipe, each chamber of the hot air tank is respectively provided with a hot air pipe, and each hot air pipe is communicated to each section of the open-fire heating furnace. Each chamber of the cold air tank is respectively provided with a cold air pipe, each cold air pipe is communicated with a cold air header pipe, and a cold air valve is arranged on each cold air pipe. In the invention, the air quantity of each working section of the open-fire heating furnace is controlled by adjusting the air quantity entering each cold air pipe of the preheater, and the cold air valve works at normal temperature, is easy to realize automatic control and has high automatic control accuracy. The utilization rate of heat energy is high, the thermal stability of the furnace is good, and produced steel wires have good quality.

The invention provides a basic automatic rolled steel plate rapid cooling system for online solid solution treatment and belongs to the technical filed of metallurgy. The basic automatic rolled steel plate rapid cooling system comprises a basic automatic system body which is provided with a rapid cooling water treatment system and a hydraulic system and can be used for online solution treatment of steel of relevant types. According to the basic automatic rolled steel plate rapid cooling system, through the arrangement of the reasonable basic automatic system body provided with the water treatment system and the hydraulic system, full-automatic accurate control over the cooling process is achieved. According to the basic automatic rolled steel plate rapid cooling system for online solid solution treatment, the investment is small, a cooling device is compact and capable of saving energy, the cooling rate is high, the range of the thicknesses of steel plates which can be cooled in a controlled mode is wide, the automatic control precision is high, and the plate shape after cooling is good.

The invention discloses a direct current micro voltage / micro current detection device and a detection method thereof. The detection device comprises an oscillation circuit, a digital signal amplifying circuit, a subtractor and a numerical value scaling unit, wherein the oscillation circuit comprises a first voltage-controlled oscillator and a second voltage-controlled oscillator, the parameters of the first voltage-controlled oscillator and the second voltage-controlled oscillator are the same, the input of the first voltage-controlled oscillator is connected with the output end of a signal to be detected or is grounded, the input of the second voltage-controlled oscillator is grounded or is connected with the output end of the signal to be detected, the output of the first voltage-controlled oscillator and the output of the second voltage-controlled oscillator are respectively connected with the input of the digital signal amplifying circuit; the output of the digital signal amplifying circuit is connected with the input of the subtractor, and the output of the subtractor is connected with the input of the numerical value scaling unit. The method comprises the following steps: the detection device respectively converts an input signal into oscillation frequencies by the first voltage-controlled oscillator and the second voltage-controlled oscillator, and amplifying, subtracting and conversion are carried out, so as to judge whether a direct current micro voltage or direct current micro current is input or not.