145results about How to "Change work status" patented technology

The invention discloses an intelligent scenic spot tourist safety service system based on GIS interoperation and LBS. The system comprises a client, a server and a service monitoring center. Based on an automatic and intelligent interoperation protocol and a standard between a GIS server and a LBS mobile terminal, aiming at tourists, the system realizes position association, automatic position state perception, active early warning and concurrent linkage of multiple monitoring means. A safe think tank makes a decision so as to realize bidirectional high-efficiency position safety information interaction of the tourists and a scenic spot and a timely and rapid rescue service. The system is combined with A-GPS or Big Dipper, a base station and a WiFi positioning mode to acquire accurate position information of the tourists and working personnel in the scenic spot. On an aspect of a GIS interoperation server, an intelligent and automatic GIS space analysis algorithm is designed. A mobile terminal uses an APP to acquire a function support of the server. Precision and efficiency of safe monitoring and early warning of the scenic spot are increased; forecasting and early warning are performed; accident rescue work of the personnel in each scenic spot is scientifically guided and tourist safety is guaranteed.

The invention relates to a bridge deck structure of a steel bridge, in particular to a steel and ultra-high performance concrete combined bridge deck structure, comprising a steel bridge deck, an ultra-high performance concrete layer is coated above the steel bridge deck, a bridge deck pavement layer is coated above the ultra-high performance concrete layer, and the ultra-high performance concrete layer is internally provided with reinforced bars. The steel and ultra-high performance concrete combined bridge deck structure has the advantages of small construction height, large stiffness, good binding performance between combined layers, good durability, good fatigue resistance, little vehicle impact and the like.

The invention discloses a fabricated fibrous concrete combined deck structure and a construction method thereof. The combined deck structure comprises a steel bridge deck layer, wherein a fabricated fibrous concrete layer covers the upper surface of the steel bridge deck layer; the main body of the fabricated fibrous concrete layer is a cast-in-situ fibrous concrete layer; a plurality of prefabricated fibrous concrete plates are in embedded connection with the cast-in-situ fibrous concrete layer; tongue-and-groove joints articulated with the cast-in-situ fibrous concrete layer are arranged at the periphery of each prefabricated fibrous concrete plate; and the fabricated fibrous concrete layer is equipped with steel bars. The construction method comprises the following steps: the steel bridge deck layer is manufactured at first, and then the prefabricated fibrous concrete plates are manufactured and laid, or steel bridge deck blocks are prefabricated at first, and steel beams are erected and assembled; after that, the construction of the cast-in-situ fibrous concrete layer and the surface treatment are carried out in sequence; and the construction is completed finally. The combined deck structure disclosed by the invention can improve the tensile strength limit of concrete slabs and effectively prevent a pavement layer from cracks, and has good service durability, good fatigue resistance; and the construction process is simple and efficient.

The invention discloses a testboard used for detecting automatic transmission performance and a fault. The testboard comprises a pedestal, a variable-frequency and variable-speed motor and a load loader, wherein the variable-frequency and variable-speed motor and the load loader are arranged on the pedestal. An input terminal of an automatic transmission is connected with the variable-frequency and variable-speed motor and an output terminal is connected with the load loader. A computer inputs an instruction to a frequency converter control module so as to make the variable-frequency and variable-speed motor simulate an engine and provide power for the automatic transmission. The computer inputs the instruction to a loading control module so as control the load applied to an automatic transmission output shaft by the load loader and simulate a pavement state of a wheel. Actual data collected by a sensor is returned to the computer and compared with theoretical data. If the two data are consistent, the automatic transmission performance is qualified and there is no fault. If the two data are inconsistent, the automatic transmission performance is not qualified and there is the fault. A frequency conversion speed regulator can move and rotate back and forth, up and down relatively to the pedestal and a loading device can move left and right relatively to the pedestal. Therefore, the apparatus and the method can be suitable for different models of the automatic transmissions.

The invention discloses a mass concrete temperature intelligent monitoring and controlling device, which comprises a circulating pipeline formed by sequentially connecting a water supply device, a water distribution device, a concrete cooling system and a water return device, wherein the concrete cooling system is internally provided with a temperature monitoring device; and a centralized controlsystem which is respectively connected with the water supply device, the water distribution device, the concrete cooling system and the water return device. The concrete cooling system comprises a cooling water pipe arranged in the concrete. Usage of the device comprises a concrete cooling system setting step, a monitoring device setting step, a water distribution device setting step, a water supply device setting step, a water return device setting step, a mass concrete construction preparation step, a data acquisition step, a water supply pressure stabilization step, an alarm step, a hot water tank drainage step and a cold water tank water replenishing step. By the adoption of the mass concrete temperature intelligent monitoring and controlling device, water supply pressure can be stabilized, different water inlet temperatures and flow rates of each layer can be dynamically adjusted, temperature field change in the mass concrete can be developed according to a target of temperature control, and an alarm function is equipped, so that the problems that a temperature difference of each region of the mass concrete is too large and cracks are easy to generate are solved.

The invention discloses a contacting and rubbing device of a nano-particle air film static-pressure thrust bearing. The contacting and rubbing device comprises a base frame, a bearing part, a loading mechanism and a detection system. The bearing part comprises an upper bearing plate and a lower bearing plate; a mixed air flow of gas-nano particles enters the inner part of a bearing through the upper bearing plate so that the upper bearing plate floats; the lower bearing plate is mounted on a high-precision transmission shaft and is connected with an external servo motor through a synchronous cog belt; a flexible measurement line led out from the detection system is mounted on the upper bearing plate. According to the device disclosed by the invention, a contacting and rubbing state of the nano-particle air film static-pressure thrust bearing can be simulated and a gas lubricating medium with nano particles can be introduced, so that a load borne by the bearing and the rotary speed of the bearing can be changed, and a friction coefficient value between two surfaces in the contacting and rubbing process can be measured online.

Methods and apparatus are disclosed for suppressing circuit noise due to parasitic elements in switch mode power supplies. The presented embodiments use actively controlled damping devices such as controllable resistors, current sources, and tri-state power devices to achieve required damping and to minimize power loss.

The invention discloses a planar piezoelectric-driven platform with three degrees of freedom and a method for driving the planar piezoelectric-driven platform to move, and belongs to the field of precision driving technologies. The planar piezoelectric-driven platform comprises a function platform, piezoelectric driving modules, an elastic plate and a fixed platform. The function platform is used for carrying and positioning objects and is connected with the piezoelectric driving modules; each piezoelectric driving module comprises two piezoelectric stacks, a displacement amplification mechanism, connecting plates, a fixing bolt and pretension force bolts; the elastic plate is connected with the piezoelectric driving modules by the fixing bolts; the fixed platform is used as a support platform for the elastic plate and is arranged on the lower side of the elastic plate. The planar piezoelectric-driven platform and the method have the advantages that specific driving signals are respectively transmitted to the piezoelectric driving modules which are arranged on the elastic plate to form a square respectively, so that traveling waves which run in different directions can be stimulated on the elastic plate, and the function platform with three degrees of freedom can move; errors such as hinge gaps due to traditional mechanical transmission can be prevented, and a large-stroke and high-precision target positioning effect can be realized.

The invention relates to an automatic dust removal device and belongs to the technical field of dust removal. The automatic dust removal device comprises a machine body, a temperature sensor, a controller and an advancing part. The temperature sensor is arranged on the machine body. The temperature sensor and the advancing part are electrically connected with the controller. The controller is used for changing the local working state when the detection temperature of the temperature sensor is raised into a first preset temperature range. By means of the automatic dust removal device, the safety of the automatic dust removal device can be improved.

The invention relates to a water gun nozzle, in particular to a water gun nozzle for fire fighting. The water gun nozzle comprises a nozzle water pipe, a valve core, a jet nozzle, a nozzle plug cover,a valve core plug and spring assemblies, wherein the valve core is slidably connected in the nozzle water pipe, the interior of the valve core is connected with a valve core plug in a sliding mode, the jet nozzle is fixedly connected to the nozzle water pipe, the spray head plug cover is connected between the spray head water pipe and the jet nozzle in a threaded fit mode, the spring assemblies comprises springs I and springs II, the springs I are located in the springs II, and the springs I are located between the valve core plug and the jet nozzle, the springs II are located between the valve core and the jet nozzle, a low-pressure water cavity is formed among the nozzle water pipe, the jet nozzle and the nozzle plug cover, and a high-pressure water cavity is formed in the middle end ofthe nozzle water pipe and the jet nozzle. According to the water gun nozzle, the working water pressure can be selected according to needs, so that the working state is changed, and the use requirements of the fire-fighting operation can be well met; and the fire can be more effectively jetted according to the water pressure conversion spraying mode.

The invention discloses a movable trestle which comprises a trestle body, steel cables, an eye plate, a hanging bracket, a lifting winch, a guide rail and a displacement winch. The trestle body is hinged to the hanging bracket through the eye plate. The rail and the displacement winch are fixedly installed on a deck perpendicular to a ship board and are connected through the steel cables. The lifting winch is installed on a bottom frame of the hanging bracket, the steel cables wound around the lifting winch are directly connected with pulleys on the two sides of the middle of the trestle body through a pulley system installed on the hanging bracket, and therefore a vertical swing structure of the trestle body with the eye plate as a hinging point is formed. The hanging bracket is dragged by the displacement winch through the wound steel cables to reciprocate along the rail. The trestle body is in a flatly-placed state, can be moved to the inner side of the ship board along with the hanging bracket so as to be in a hidden state and can be in an erected state when moved reversely. The movable trestle is prepared for a ship and can be autonomously erected when the ship is moored at a wharf.

The invention provides a controller for a series compensation device, and belongs to the technical field of capacitor compensation. The controller solves the technical problems that the existing controller is single in function, low in control efficiency on the series compensation device and incomprehensive in protection so that the series compensation device is low in reliability and poor in stability. The controller for the series compensation device comprises a main controller, a detection circuit, a switching control circuit and a communication device, wherein the main controller is connected with the detection circuit, the switching control circuit and the communication device; the main controller is arranged outside the series compensation device, and controls the operation of the switching control circuit and the communication device inside the series compensation device according to the detection result of the detection circuit; and the communication device is in communication connection with a control center. The controller is used for operating control of the series compensation device.

The invention relates to novel spherical powder and a preparation method thereof. The method comprises the following steps that an electrode and a workpiece are arranged at two poles of a power supply; a discharge gap between the electrode and the workpiece is adjusted through a motion control system to generate arc plasma; the arc plasma acts on the electrode and the surface of the workpiece so that the electrode and the surface of the workpiece are fused to form a fusion area; a fluid medium is introduced into the discharge gap; the flow rate of the fluid medium is controlled; the relative rotating speed of the electrode or the workpiece is controlled; the work state of the arc plasma is changed, so that tiny explosion is generated in the fusion area; a material in the fusion area is thrown away and crushed, the crushed material is condensed in the fluid medium, and condensed fine spherical powder is collected; and the electrode or the workpiece is provided with a hollow cavity. Thespherical powder prepared through the method is small in particle size, regular in particle shape, high in sphericity degree and low in content of hollow powder and satellite powder.

The invention relates to a flaw detection support and an ultrasonic flaw detector, wherein the flaw detection support comprises a hanging frame assembly, a sliding frame assembly and a sliding shoe probe assembly; the hanging frame assembly comprises at least one hanging frame guide assembly, the hanging frame guide assembly comprises a guide shaft and a first spring, and the guide shaft is vertically arranged; the sliding frame assembly comprises a sliding frame plate assembly and at least one sliding frame guide assembly, the first spring and the sliding frame plate assembly are arranged onthe guide shaft in a sleeving mode, the sliding frame guide assembly comprises a guide shaft and a second spring, the guide shaft is horizontally fixed to the sliding frame plate assembly, and the second spring and the sliding shoe probe assembly are arranged on the guide shaft in a sleeving mode. The carriage assembly ensures that the skid shoe probe assembly is downwardly attached to a steel rail; the sliding shoe probe assembly can horizontally move along the guide shaft, so that the sliding shoe probe assembly is tightly attached to the steel rail from the side direction. The skid shoe probe assembly is always reliably attached to the preset flaw detection position of the steel rail along with the curve change of the inner side face of the steel rail.

The invention discloses a light ray adjusting method and an apparatus. The method comprises: acquiring at least one sample data of illumination of current environment by a digital television terminal which is connected with an intelligent lighting device; performing statistical processing for the at least one sample data of the illumination according to a preset light detecting mode to obtain environment illumination data, wherein the environment illumination data is used for measuring the whole light intensity of the current environment; and if the environment illumination data meets a predefined illumination adjusting condition, transmitting an illumination adjusting command to the intelligent lighting device by the digital television terminal to change the working state of the intelligent lighting device, so as to adjust the illumination of the current environment]. According to the embodiments of the invention, it is possible to automatically adjust light brightness in current environment, change lighting condition of current environment in real time and effectively protects the eyes of a user.

The invention relates to a rotary tiller with an automatic clutch device. The rotary tiller comprises a lifting rotary tilling device which is connected onto a rack. The rotary tilling device comprises a transmission case and a rotary tilling blade which is installed on the output shaft of the transmission case. A transmission case body is movably hinged on the rack by taking the input shaft of the transmission case as an axis. A lifting mechanism is connected with the transmission case body and can push the transmission case body to rotate around the hinge axis, so as to lift the rotary tilling blade to change the working position of the rotary tilling blade. A belt clutch wheel is arranged on the input shaft of the transmission case. A declutch seat in the belt clutch wheel is fixedly arranged on the transmission case body. A declutch claw in the belt clutch wheel is axially and movably fixed on the rack. Since the declutch claw of the belt clutch wheel is axially and movably fixed on the rack, the declutch claw always does not rotate and the working state of the belt clutch wheel is changed only through the magnitude of the rotating angle of the declutch seat which rotates with the transmission case body, the accurate and reliable control on the rotating and stopping states of the rotary tilling device can be realized and the potential safety hazard that the rotary tilling blade accidentally rotates is eliminated; and the automatic clutch function of the rotary tilling device is realized and the rotary tiller is enabled to have the characteristics of simplicity and convenience in operation and high automation level.

The invention discloses a compound pendulum type roller mill which is capable of increasing the grinding area and improving grinding efficiency, high in efficiency and low in consumption. The compound pendulum type roller mill comprises a swinging box, wherein a bottom plate of the swinging box is in an arc shape, and the swinging box is equally divided into two parts at bearing central shafts at the two ends so that the swinging box tends to be in a two-force balance state in the moving process. The swinging box is hinged to the two ends of a support through the bearing central shafts. Spring boosters are mounted on the ground and located on the two sides of the swing of the swinging box. The spring boosters and a driving device jointly drive the swinging box to conduct compound pendulum motion under resultant force. The driving device is a crank and rocker mechanism. A box body is divided into two or more working bins by partition plates. Each partition plate is provided with material fineness control and material passing holes. A grinding medium roll is placed in each bin and conducts curvilinear motion to grind and impact ore to be thin and broken.

The present invention relates to a backlight driving and controlling circuit with an isolating-type power factor correction configuration, and comprises a power stage for providing the power supply; a driver stage with a first power factor adjustment unit for adjusting the power factor of the power supply and outputting DC source, and with a conversion unit for converting a medium voltage DC power into a high power output to further drive the back-light light emitting elements to work; and a control / dimming stage with a second power factor adjustment unit and a DC variable voltage unit and an AD board arranged on the secondary of the DC variable voltage unit and connected with the ground commonly with the conversion unit. The present invention adopts the design of electric isolation and circuit configuration of communal connection with the ground, which forms the electric isolation between the power factor adjustment unit and the power stage, and allows the AD board to directly control / dim the above-mentioned conversion unit of the diver stage, thereby changing the working state of back-light light emitting elements.

The invention relates to the technical field of agricultural machinery, in particular to a seeder unit. The seeder unit comprises a rack, and a seed can, a moving plate, a push rod groove, a push rod mechanism, a cam mechanism, a spring and a motor which are installed on the rack, wherein a seed outlet is formed in the bottom of the seed can; a seed opening is formed in the moving plate; the push rod groove is formed under the moving plate; the push rod mechanism comprises a push rod and a roller wheel; a push rod is installed in the push rod groove in a sliding way, one end of the push rod is connected with the moving plate by a connecting piece, and the other end of the push rod is connected with the cam mechanism by the roller wheel; the cam mechanism is connected with the motor; the two ends of the spring are respectively connected with the push rod groove and the push rod; the push rod is driven to make reciprocating motion in the push rod groove by the spring and the cam mechanism together. The seeder unit is simple and compact in structure, convenient to make and install, stable and uniform in seed arrangement and low in seed damage rate, thus being widely applied to agricultural sowing practice.

The invention discloses a full-automatic efficient polishing machine. The full-automatic efficient polishing machine comprises a rotary disc capable of rotating in an indexing mode, a first side facerough polishing device, a second side face rough polishing device, a forward longitudinal polishing device, a reverse longitudinal polishing device and a transverse polishing device, wherein the firstside face rough polishing device, the second side face rough polishing device, the forward longitudinal polishing device, the reverse longitudinal polishing device and the transverse polishing deviceare arranged in the circumferential direction of the rotary disc, and a plurality of clamps evenly distributed and used for fixing products to be polished and a first motor driving one clamp to horizontally rotate are arranged in the circumferential direction of the rotary disc. According to the full-automatic efficient polishing machine, grid textures can be formed on the surface of a product, and the function of the polishing machine is expanded.

The invention discloses a multilayer upright full-automatic dish washing machine, and belongs to the technical field of dish washing machines. The multilayer upright full-automatic dish washing machine comprises a shell, a cleaning and spraying component, a heating and drying component, an automatic water inlet and discharge component, a quantitative dish washing powder adding component and a dishsupport component, wherein the interior of the shell is of a hollow structure, two clapboards are arranged in the shell and divide the internal space of the shell into a control chamber, a cleaning chamber and a water pool; the cleaning and spaying component is arranged in the cleaning chamber, the heating and drying component is arranged in the water pool, the automatic water inlet and dischargecomponent is arranged in the control chamber and the water pool, the quantitative dish washing powder adding component is arranged in the control chamber, the dish support component is arranged in the cleaning chamber, and a filtering component is arranged in the water pool. The multilayer upright full-automatic dish washing machine can increase the dish cleaning quantity in a single time while ensuring the cleaning effect, does not need a person to watch in the cleaning process, is simple and convenient in operation, and is more water-saving and environment-friendly compared with the prior art.

The invention discloses an optical structure and a display device. The optical structure comprises a light guide plate, a power source assembly and a first polarizer. The light guide plate is providedwith a first surface, a second surface and a side surface connected with the first surface and the second surface, the first surface is arranged opposite to the second surface, and light is transmitted in the direction from the first surface to the second surface of the light guide plate; the power source assembly is arranged on the side surface and used for providing first incident light for thelight guide plate, and the first incident light is linearly polarized light in the first polarization direction; the first polarizer is arranged on the first surface, and the direction of a light transmission shaft of the first polarizer is perpendicular to the first polarization direction. When the optical structure is applied to the reflection-type display device, the display device can conductnormal display under the environment with weak environmental light. In addition, the direction of the light transmission shaft of the arranged first polarizer is perpendicular to the first polarization direction of the first incident light, and therefore the first incident light cannot be emitted from the first surface of the light guide plate; in this way, the contrast ratio of the display device can be remarkably increased, the color range of the display device is enlarged, and the display effect of the display device is improved.

The invention relates to a phase change heat storage system and a control method thereof. The phase change heat storage system comprises an electric boiler, a first heat exchange device, a heat storage device, a second heat exchange device, a user side heat exchanger and a master control module, all of which are connected through pipelines. The master control module is used for controlling starting and stopping of the electric boiler and starting and stopping of the first heat exchange device or the second heat exchange device according to the actual power consumption condition of a power grid and the actual temperature of a heat storage material in the heat storage device so as to change the working states of the electric boiler and the heat storage device. The system further comprises a current adjusting module used for adjusting the working current of the electric boiler to enable the actual outlet temperature of the electric boiler to be the target outlet temperature of the electric boiler. According to the technical scheme, the current adjusting module adopts a double closed-loop structure of PID control and PI control, the temperature control response speed of the electric boiler in the phase change heat storage system is increased, meanwhile, the master control module and the current adjusting module of the system are adjusted and controlled by a power grid dispatching center, and therefore the aim that the system participates in power system dispatching is achieved.

The invention discloses a knee joint power assisting device with automatically changed rigidity. The device is composed of a thigh supporting rod, a crus supporting rod, a connecting rod, a slide block, an elastic piece, a sliding member and a sliding support rod. The thigh support supporting rod and the crus supporting rod are rotably connected; the upper end of the connecting rod is hinged to the thigh supporting rod, and the lower end is hinged to the slide block; the crus supporting rod is sleeved with the slide block through a slide groove, and the lower end of the slide block is fixed with the upper end of the elastic piece; the crus supporting rod is sleeved with the elastic piece, and the lower end of the elastic piece is fixed with the sliding member; the crus supporting rod is sleeved with the sliding member through a slide groove, and the lower end of the sliding member is fixed with the sliding support rod; the sliding support rod is parallel to the crus supporting rod. The device achieves the automatic change of support-phase knee joint rigidity and swing-phase knee joint rigidity when lower limbs of the human body are in walking, and better power assisting effects are provided for knee joints.

The invention relates to a display screen processing technology. The display screen processing technology comprises the following steps: S1a, transporting a backlight source to a first film tearing device so as to tear off a protective film on the surface of the backlight source; S1b, positioning the position of a liquid crystal module; S2, conveying the positioned liquid crystal module to a second film tearing device, so that a protective film on the surface of the liquid crystal module is torn off; S3, conveying the liquid crystal module and the backlight source to a CCD detection system to be positioned; S4, then attaching the liquid crystal module to the surface of the backlight source; S5, pressing the liquid crystal module on the surface of the backlight source; and S6, carrying out automatic optical detection on the assembled product. The film tearing operation on the surfaces of the backlight source and the liquid crystal module is carried out simultaneously, so that the production efficiency of products can be effectively improved; and on the other hand, the protective films on the backlight source and the liquid crystal module are torn off through a mechanical structure, manual operation is reduced, and the automation degree of equipment is effectively improved.

The invention discloses a photosensitive imaging detection chip based on tip electronic fluorescence excitation. The photosensitive imaging detection chip comprises an optical antenna, a fluorescent film layer and a photosensitive array which are arranged in parallel, wherein the optical antenna is of an array structure composed of a plurality of antenna elements which are arranged at intervals and electrically connected. The fluorescent film layer is of an array structure composed of a plurality of fluorescent film elements which are arranged at intervals and electrically connected. The photosensitive array is of an array structure composed of a plurality of photosensitive elements which are arranged at intervals. The optical antenna, the fluorescent film layer and the photosensitive array are the same in shape and array scale, the antenna elements of the optical antenna, the fluorescent film elements at the corresponding positions in the fluorescent film layer and the photosensitiveelements at the corresponding positions in the photosensitive array are aligned with one another in the vertical direction, and each antenna element of the optical antenna comprises at least one nanopointed cone of which the top surfaces are electrically connected with one another. Incident light amplification and conversion from infrared light to visible light spectrum are realized through electron controlled emission and fluorescence excitation of the nano pointed cones, so that the detection sensitivity is remarkably improved.

The invention relates to a density-adjustable multilayer periodic structure. The periodic structure comprises a central thin film or a central plate base body layer (1), embedded block bodies (2) andouter side thin films or outer side plate base body layers (3), wherein the central thin film or the central plate base body layer (1) is positioned in the middle layer, the outer side thin films or the outer side plate base body layers (3) are arranged on the two sides of the central thin film or the central plate base body layer (1), the embedded block bodies (2) which are overally arranged in aperiodical mode are uniformly arranged in the outer side thin films or the outer side plate base body layers (3), so that the multilayer periodic structure is formed through stacking based on the above mode. The multilayer periodic structure is fixed on a frame with a large rigidity to be subjected to pre-stretching, the density of the periodic structure can be adjusted, so that the physical parameters of the periodic structure are changed, and the active control over periodic structure band gaps is realized; and the structure can be applied to the field of vibration reduction and vibration isolation, compared with a traditional active and passive vibration isolation structure, the periodic structure has the advantages of light weight, wide vibration isolation frequency, high reliabilityand the like, and meanwhile, the structure can be used for actively controlling the band gap range.

The invention relates to a seed-metering device of a seeder, belonging to the technical field of agricultural machinery. The seed-metering device comprises a shell with a rotary shaft, wherein large and small seed seed-metering wheels are installed on the rotary shaft in parallel, the large and small seed seed-metering wheels are respectively fixed on the rotary shaft in a sleeved mode, the shell is hinged with one end of an elastic seed protective tongue below the large and small seed seed-metering wheels, the other end of the elastic seed protective tongue leans against the lower ends of the large and small seed seed-metering wheels, an eccentric pin hole for accommodating a sliding pin is formed on the end face of the large seed seed-metering wheel, a through hole and a dialing block are arranged on the end face of the small seed seed-metering wheel, and the through hole and the dialing block as well as the eccentric pin hole are located in a same rotary radius. The seed-metering device provided by the invention not only can be used for seeding great grains such as paddy and wheat, but also can be used for seeding small grains such as oilseed rape and sesame. The seed-metering device has the advantages of convenience in operation and high seeding precision.