172results about How to "Improve work performance" patented technology

An embodiment of the invention discloses a serial-connection power supply chip, a serial-connection power supply system, a virtual digital currency mining machine and a server. The serial-connection power supply chip comprises n serial-connection to-be-powered units which are powered in a serial connection manner, a voltage domain is formed in every to-be-powered unit, and voltage of a power source of the serial-connection power supply chip forms n-stage serial-connection voltage domains, wherein n is an integer more than 1; a signal level conversion unit is serially connected between every two adjacent to-be-powered units and used for communication signal level conversion between every two adjacent to-be-powered units. The serial-connection power supply chip has the advantages that the work performance of the to-be-powered units and the whole work performance of the chip are improved, and the whole production cost is reduced.

The invention discloses a battery pack temperature control device, which comprises a battery pack module, an air heating module, a heat exchange cooling module, a temperature adjusting medium switching module, a temperature sensing module and a control module, wherein the battery pack module comprises a battery pack body; the air heating module is used for heating air and circulating hot air between the air heating module and the battery pack body through a gas pipeline; the heat exchange cooling module is used for controlling a cooling liquid to circulate through a liquid pipeline between the heat exchange cooling module and the battery pack body, and cooling the cooling liquid; the temperature adjusting medium switching module is used for switching the type of a temperature adjusting medium in the battery pack body; the temperature sensing module is used for detecting an environment temperature at which the battery pack module is; and the control module controls the air heating module, the heat exchange cooling module and the temperature adjusting medium switching module according to the environment temperature. According to the battery pack temperature control device, a battery pack can be adjusted to work at an optimum temperature and the service life of the batteries is prolonged. The invention further discloses a battery pack temperature control method and a vehicle.

A heart cam and damper unit includes a base member having fixed cylindrical portions and a stopper portion, a rotating member having a movable cylindrical portion which is rotatably assembled to the fixed cylindrical portion with a viscous fluid interposed between the movable cylindrical portion and the fixed cylindrical portions, and a pinion gear rotating integrally with the movable cylindrical portion, a heart cam member rotatable fitted around an outer periphery of an outwardly located one of the fixed cylindrical portion and the movable cylindrical portion, and a device interposed between the base member and the heart cam member and adapted to rotatably urge the heart cam member toward the stopper portion. The heart cam and damper unit is interposed between a main body portion and a movable portion which undergoes opening and closing action with respect to the main body portion and is constantly urged in an opening direction.

The present invention discloses slow-release cationic anti-mud polycarboxylic-type high performance water reducer and a preparation method thereof. The slow-release cationic anti-mud polycarboxylic-type high performance water reducer is successfully synthesized from an unsaturated carboxylic acid, a polyether macromonomer, a cationic unsaturated monomer, an unsaturated esters, a crosslinking agent, a chain transfer agent, an oxidizing agent and a reducing agent as raw materials at room temperature without heat source. By introduction of the long-chain-ester crosslinking agent and the cationic unsaturated monomer, the slow-release cationic anti-mud polycarboxylic-type high performance water reducer has good slow-release and anti-mud effects, is low in admixing volume, high in water-reducing rate, excellent in slump retention ability, and not sensitive to mud contained in sand and stones, and the process does not require an additional heat source, an be carried out at room temperature, and is low in investment, low in cost, and suitable for large scale promotion and application.

The invention relates to an MEMS (micro-electromechanical systems) device and a vacuum encapsulation method of the wafer level thereof. The device is characterized in that wafer level vacuum encapsulation is realized by adopting a silicon-silicon direct bonding technology, a low-resistance silicon wafer is adopted in a silicon structure layer (15) bonded to a silicon substrate, and is directly etched on the silicon layer to form an electrical interconnection lead wire (5); and aluminum electrode (14) is sputtered on an electrical interconnection lead wire bonding area (4) in a lead wire through hole (13) of a silicon nut cap (12). The device has the advantages that a total silicon structure is adopted, and no residual stress exits after bonding, so that the working performance of the device can be greatly improved; low-resistance silicon is utilized as an electrode lead wire, so that damage of high temperature to a metal electrode in the silicon-silicon direct bonding process can be avoided; and the silicon-silicon direct bonding air tightness is extremely good, so that the encapsulation cost is greatly reduced. The method is high in accordance and reliability, and the process is easily implemented.

The invention discloses a modulation method and a modulation controller for a modular multi-level converter. The modulation method comprises the following steps: calculating the number njp of first sub-modules and the number of njn second sub-modules needing to be input by an upper bridge arm and a lower bridge arm respectively at each current moment according to an output voltage command value of the modular multi-level converter; selecting one of the sub-modules of the upper bridge arm to perform PWM (Pulse-Width Modulation); selecting one of the sub-modules of the lower bridge arm to perform PWM; inputting njp sub-modules of the upper bridge arm in each phase and njn-1 sub-modules of the lower bridge arm; keeping the sub-module performing PWM of the upper bridge arm and the sub-modules performing PWM of the lower bridge arm in an output complementation working state. On the basis of the modulation method and the modulation controller, efficient and accurate voltage output can be realized on a medium-voltage electric energy converting occasion with a small quantity of levels, thereby effectively improving the working performance of the modular multi-level converter.

The invention discloses a pressing and punching mold for a hub reduction gear outer gear ring. The pressing and punching mold for the hub reduction gear outer gear ring is composed of an upper die and a lower die; the lower die consists of a fixed bracket support, a quenching support, an expander, an annular spring ring, a pressing and fixing device, a compression return spring, an operating bearing platform and a cooling cylinder; the parts installed on the operating bearing platform are sequentially the fixed bracket support, the quenching support and the cooling cylinder from inward to outward; the expander and the pressing and fixing device are installed on the upper part of the fixed bracket support; the conical surface of the pressing and fixing device is matched with the conical surface of the expander; a cylinder at the lower part of the pressing and fixing device extends into a central hole of the fixed bracket support through a central hole of the expander; the compression return spring is installed in a cylindrical hole of the lower end of the pressing and fixing device; the compression return spring is supported in a hole of the operating bearing platform; the upper die consists of an upper pressing die and a lower pressing plate and a lower pressing column on a press; the upper pressing die is connected to the lower pressing plate on the press through a bolt; a middle round hole of the upper pressing die and the lower pressing plate is the lower pressing column on the press.

The invention discloses an air-pressure-adjustable type oil gas suspension system, which comprises an oil gas suspension mechanism which is provided with inflatable energy accumulators (16 and 17) for reducing vibration, and also comprises an air pressure adjusting unit, wherein the air pressure adjusting unit comprises an air chamber serving as an air source, and the volume of the air chamber can be adjusted; inflation openings of the inflatable energy accumulators (16 and 17) for reducing the vibration are respectively connected onto the air chamber through respective branch air channels (8); and a branch air channel on-off valve (18) is arranged on each branch air channel (8). Besides, the invention also discloses an air pressure adjusting method for the air-pressure-adjustable type oil gas suspension system and an engineering vehicle. The air-pressure-adjustable type oil gas suspension system has the advantages that through additionally arranging the air pressure adjusting unit in the oil gas suspension mechanism, when the air pressure drops due to leakage and the like of the inflatable energy accumulators for reducing the vibration of the oil gas suspension mechanism, the energy accumulators can be conveniently inflated through the air pressure adjusting unit to increase the air pressure, so the working performance of the oil gas suspension mechanism is relatively effectively improved.

The invention provides an ultrasonic transducer and an electronic device. The ultrasonic transducer device includes: a sensing medium layer, an ultrasonic receiving layer which can receive ultrasonicwaves, and an ultrasonic transmitting layer which can transmit ultrasonic waves; wherein the ultrasonic transmitting layer and the ultrasonic receiving layer are arranged below the sensing medium layer in a laminated manner. According to the ultrasonic transducer device provided by the invention, purposes that the ultrasonic transducer has stronger ultrasonic transmitting capability and better receiving effect are achieved, and a problem that performance of the ultrasonic transducer is influenced due to poor ultrasonic generating capability of an existing ultrasonic transducer is solved.

The invention relates to a connection joint between a prefabricated reinforced concrete superposed beam and a steel pipe column and a construction method thereof, and belongs to the field of buildingstructures. The joint is composed of a prefabricated steel pipe column, the prefabricated reinforced concrete superposed beam, a U-shaped steel sleeve, a connecting region and superposed board cast-in-place concrete; the prefabricated steel pipe column comprises the steel pipe column and a reserved H-shaped steel end head welded to the outer wall of the steel pipe column; the prefabricated reinforced concrete superposed beam comprises an upper load-bearing bar, a lower load-bearing bar, stirrups, a T-shaped connecting piece and precast concrete, wherein the T-shaped connecting piece is composed of a flange steel plate, a web steel plate and toggle pins welded to a web; the U-shaped steel sleeve comprises a U-shaped steel groove turning outward and connecting steel bars.

This invention discloses a co-burning method for oxygen sensor electrolyte and Pt electrode including the following steps: A, matching materials according to 50-60% ZrO< 2 > base electrolyte of the weight percentage and 40-50% adhesive, grinding and doctor-blading gels to be bladed to 0.1-0.2mm films on a doctor-blading machine to be laminated to 3-6 layers to be equal-static pressed to lamination films to be cut according to sizes, B, matching materials of 65-85% Pt powder, 15-35% bond and 0-2% glass powder to be mixed to a Pt electrode slurry, C, processing printed silk net to print the Pt electrode slurry by step B on the laminated layer film, the Pt electrode is 50-150mum thick to be cut according to the size of the oxygen sensor the gel is blown out and sintered under 1500-1600deg.C for 2-6 hours to integrate the two into one.

The invention discloses a variable-structure exhaust nozzle of a rocket based combined cycle engine. An inner flow field of the exhaust nozzle is in an overexpansion state under an injection modality, the inner flow field of the exhaust nozzle is in an under-expansion state under an under-combustion/super-combustion state, an upper cover plate is driven by a motor, and suction slotted holes in a rear body of an aircraft is made to be in an opened or closed state. The suction slotted holes in the upper wall face of the a spray pipe are opened when the engine works at a non-design point, the suction slotted holes in the wall face of the spray pipe are closed when the engine works at a design point, the work performance of the spray pipe under the injection modality is improved, and meanwhile it is guaranteed that the work performance of the spray pipe under the under-combustion/super-combustion modality is not reduced. The variable-structure exhaust nozzle is strong in expandability, and the suction slotted holes with different section areas can be designed according to the actual geometric structures, the work envelope curve and the work performance needs of the exhaust nozzle. The suction slotted holes are distributed according to the actual structural size of the exhaust nozzle, and the work performance of the exhaust nozzle under the non-design point is improved.

The invention discloses a multi-criterion radar emission signal design method based on phase modulation. The multi-criterion radar emission signal design method based on the phase modulation mainly solves the problems that an existing technical signal is single in optimization criterion and ideal and simple in environmental model. The realization process of the multi-criterion radar emission signal design method based on the phase modulation includes the following steps: (1) respectively conducting frequency domain sampling on power spectra of a radar target, clutter and noise, (2) obtaining a power spectral density vector of an optimal signal with the maximized output signal-to-noise ratio as a criterion, (3) obtaining a power spectral density vector of the optimal signal with the maximized mutual information between the radar received echo and the target as a criterion, (4) building a multi-criterion signal optimization function in a weighting mode after conducting dimension unifying on the criterion of the maximized output signal-to-noise ratio and the criterion of the maximized mutual information between the radar received echo and the target, and (5) solving a radar phase coding signal through iteration to make the multi-criterion signal optimization function smallest. The multi-criterion radar emission signal design method based on the phase modulation takes effects of the clutter into consideration, and is more flexible in signal design, capable of meeting working requirements of a multitask radar system and favorable for promoting working performance of the whole system of a radar.

The invention discloses a gate drive method, a gate drive system and a gate drive device of a liquid crystal display panel. The gate drive method comprises the following steps: S1, carrying out detection to obtain current-voltage characteristics of at least one thin film transistor of the liquid crystal display panel; S2, according to the current-voltage characteristics of the at least one thin film transistor, acquiring the off-state current Ioff of the at least one thin film transistor and the voltage values corresponding to the off-state current Ioff; and S3, according to the off-state current Ioff and the voltage values, adjusting the grid working voltage VGL of the at least one thin film transistor of the liquid crystal display panel. With the adoption of the method, the system and the device, the threshold voltage (Vth) drift of a gate drive circuit is solved, the working performance of the liquid crystal display panel is promoted, and the service life of the liquid crystal display panel is prolonged; in addition, the requirements of the gate drive circuit for the threshold voltage (Vth) drift are lowered, and thus the processing difficulty of factories is reduced.

The invention discloses a topological insulator heterogeneous composite film with a high spin polarized electron transport channel, and the topological insulator heterogeneous composite film comprises a 6H-SiC (0001) or SrTiO3 substrate and topological insulator 6QLBi2Se3 and ordinary semiconductor 3QLSb2S3 which are in order grown on the substrate by a molecular beam epitaxy technology in an ultra high vacuum system. Through coverage of the surface of topological insulator Bi2Se3 with the Sb2S3, the electrical properties of the composite film are significantly improved compared with that of a pure Bi2Se3 film; the Dirac point is changed from 0.1eV less than valence-band maximum to 0.09eV higher than valence-band maximum, Fermi velocity is improved from 1.15 eV. Angstrom to 1.61eV. Angstrom, spin polarization rate is also increased from 0.65 to 0.91; at the same time, the width of the spin polarized electron transport channel is improved from about 1nm to 3nm, and can be further expanded according to the needs by increasing of the Sb2S3 covering layer thickness; and the Sb2S3 covering layer can reduce influence on the spin polarized electron flow transport channel due to surface contamination such as oxidation and the like.

In order to solve the technical problem that working performance of photo counting detector-adopted three-dimensional imaging laser radars is reduced under strong noise environments, the invention provides a photo counting-based three-dimensional image signal-noise separation and mixed regularization reconstruction method. The method comprises the following steps of: determining a signal cluster set on each pixel by adoption of a sliding time window method and filtering noise counting except time windows of the signal cluster sets; if both signal counting and noise counting do not exist on a certain pixel, constructing a superpixel by replacing a time accumulation process by space accumulation by means of counting information on a neighborhood pixel, and filtering the noise by adoption ofthe sliding tine window method; and finally, reprocessing a preliminary noise-filtered image by utilizing a total variation regular item, wavelet regular item and contourlet regular item combined mixed regularization method, so as to finally obtain a high-quality three-dimensional image. According to the method, signal photos can be effectively separated from noises under strong background noises,so that the rapid and accurate reconstruction of target three-dimensional images is realized.

The invention discloses an intelligent adjusting method for temperature loads of an arched concrete dam. The method is characterized by comprising the following steps that the average temperature load of a dam body in every month is calculated; an allowed temperature load is determined, and temperature load increments, needing to be reduced, at different times and different portions are obtained; according to the allowed temperature load and the temperature load increments needing to be reduced, allowed temperatures at different times and different portions of the dam are inversely calculated; according to temperature values, needing to be reached through control, at different times and different portions and the temperature distribution condition of upstream reservoir water, by considering temperature control requirements during the operation period, the arrangement of cooling water pipes during the construction period is optimized, the cooling water pipes are reserved, and water passing temperatures and flows of the water pipes during the operation period are determined; a water fetching elevation range is determined; and water passes according to the determined water fetching elevation range, and temperature control is conducted by controlling the flows in the water pipes. According to the intelligent adjusting method, part of the cooling water pipes in the construction period are reserved, intelligent water passing is carried out during the operation period to control the temperature of the dam body, the temperature loads are reduced, and the working condition of the dam body is improved; safety stock is increased, and durability is improved.

The invention relates to a rotary sealing ring applied to a wet-type clutch. Dramatic abrasion is easy to occur on the traditional sealing ring under a high PV working condition, thereby resulting in failure of the sealing ring and further causing the wet-type clutch to lose the engagement function. By adopting a method for setting an isobathic rectangular groove on the end surface of the sealing ring, the invention provides sufficient lubricant medium for a friction working surface to produce dynamic pressure lubrication, thereby greatly improving the operating performance of the sealing ring. The method is simple and effective, is easy for promotion, and solves an important technical problem for the design of a high-speed and high-pressure wet-type clutch.

The invention provides a resource access method, and the method comprises the steps: receiving an access request sent by a client, the access request carrying the information of an access user, the information of access resources, and the information of an access operation; when it is determined that the number of the authorization strategies of the access user reaches a preset threshold value according to the information of the access user, searching for an authorization strategy set corresponding to the information of the access resource; authenticating the access user according to the searched authorization strategy set, the information of the access user, the information of the access resource and the information of the access operation; and when the access user passes the authentication, executing the access operation on the access resource according to the access request.

The invention discloses a chloride ion adsorption agent for a reinforced concrete structure and a preparation method thereof. The adsorption agent is prepared from the following ingredients in percentage by mass: 20 to 30 percent of cenosphere, 11 to 18 percent of mesoporous molecular sieves, 7 to 14 percent of nanometer SiO2, 4 to 8 percent of regenerated active carbon, 5 to 15 percent of calcium aluminate powder, 15 to 25 percent of calcined kaolin and 12 to 20 percent of aluminoferic cement clinkers. The chloride ion adsorption agent has the advantages that all ingredients are scientifically matched; the synergistic effect is achieved; harmful ions such as chloride ions are subjected to physical absorption by a large area of the chloride ion adsorption agent; the ingredients and the chloride ions form chemical bonds; Friedel salt is generated; the content of free chloride ions is reduced, so that the corrosion on steel bars in the reinforced concrete structure is reduced; through the physical filling effect, the reinforced concrete compactness is improved, and the harmful ions such as chloride ions are prevented from entering the inside of concrete; gel substances are generated through the volcanic ash effect, and the space originally occupied by water is filled, so that the compactness and the strength of the reinforced concrete are improved.

The invention discloses a method for sampling an average value of the output current of a chopper in the state of interrupted output current in the technical field of circuit control. The technical scheme of the method comprises the following steps of: obtaining basic parameters, such as switch frequency and the like, for the work of a switch tube of the chopper; sampling the input voltage and output voltage of the chopper under the condition of a given duty ratio D1 and sampling a current value Is at a midpoint of an output current rising interval; and calculating the average current value of the chopper in the state of the interrupted output current according to a certain algorithm after an input voltage value, an output voltage value and the current value at the midpoint of the output current rising interval of the chopper in the state of the interrupted output current. The method has the advantages of effectively improving the sampling accuracy of the average current of the chopper and greatly improving the working performance of the chopper.

The invention discloses an organic light-emitting display panel and a display device, and belongs to the technical field of display. The display panel comprises a display area and a non-display area.The display panel comprises a plurality of organic light-emitting diodes, and each organic light-emitting diode comprises an anode, a light-emitting material part, and a cathode. The cathodes are arranged on the whole plane, and cover the display region and extend to the non-display region. The non-display region comprises at least one conductive part, and the conductive part receives a fixed voltage. At least some conductive parts are overlapped with the cathodes in an insulated manner in a direction perpendicular to the organic light-emitting display panel, and the conductive parts are insulated with the anodes. According to the invention, the organic light-emitting display panel is provided with the conductive parts, and the conductive parts are overlapped with the cathodes so as to form a storage capacitor, thereby enabling the electric potentials of the cathodes not to change abruptly. Compared with the prior art, the electric potentials of the cathodes remain relatively stable, thereby facilitating the improvement of the working performances of the plurality of organic light-emitting diodes, reducing the impact on an electric signal of a touch electrode from the instability of the electric potentials of the cathodes, and improving the touch performances.

The invention relates to a power circulation system combined with a hydrogen gas turbine and hydrogen fuel cells. The power circulation system comprises hydrogen fuel cells and a combustion chamber; two paths of a hydrogen source are connected to the hydrogen fuel cells and the combustion chamber respectively; two paths of compressed air provided by an air compressor are connected to the hydrogen fuel cells and the combustion chamber respectively, and the air compressor is driven by a motor; the hydrogen fuel cells and exhaust lines of the combustion chamber are combined and connected to the turbine connected to the motor coaxially for power generation. The system can work in three operation modes: when the system needs to output partial power efficiently, the system operates by using the hydrogen fuel cells only. When the system needs to output high power quickly within a short time, the system operates by using the hydrogen gas turbine only. When the system needs to output total power, the system operates by using the hydrogen fuel cells and the combustion chamber jointly.

The invention discloses a gear-wheel composite drill bit with an impact cutting structure and belongs to the field of rock-breaking tools for drilling equipment of petroleum, natural gas, mining engineering, building foundation project construction, geology, hydrography and the like. The gear-wheel composite drill bit comprises a drill bit body and a gear-wheel cutting structure, wherein the drill bit body is provided with an impact cutting structure; the impact cutting structure comprises a force transmitting mechanism which transmits impact force and an impact cutting gear; the impact cutting gear is fixedly arranged on a punch at the tail end of the force transmitting mechanism; and the punch can slide or glidingly impact relative to the drill bit body in the impact force transmitting direction. Compared with the traditional gear-wheel drill bit, the gear-wheel composite drill bit is higher in rock-breaking efficiency and longer in the service life of the drill bit, can effectively reduce drilling cost, and is particularly suitable for harder and difficultly drilled grounds.

The invention relates to the technical field of computers, and discloses a method for adjusting the working performance of a mobile terminal. In the invention, the method for adjusting the working performance of the mobile terminal comprises the following steps of generating an adjustment trigger signal according to an acceleration signal generated by an acceleration sensor arranged on the mobile terminal; under the trigger of the adjustment trigger signal, judging whether the mobile terminal is in a speaking state or an on-line application state or not; if the mobile terminal is in the speaking state or the on-line application state, adjusting the current radio-frequency power of the mobile terminal to preset maximum radio-frequency power. Therefore, a user can actively improve the working performance of the mobile terminal according to an actual requirement, so as to improve user experience.

The invention relates to a thermo-motive water cycling system and in particular relates to a thermo-motive water-cycling system of electric heating water heating cushions (comprising a mattress, a cushion, a floor mat, a sofa cushion, a foot pad, a bustle, a pillow and the like), water heating bedclothes, heaters and the like and aims at providing a thermo-motive water-cycling system capable of effectively discharging gas which can not be reverted to water without an evaporation pipe. The first scheme adopted by the invention is as follows: a water storage tank is communicated with a heating cylinder through a check valve; the heating cylinder is communicated with a water channel through a water outlet connecting pipe; the water channel is communicated with the water storage tank through a water inlet connecting pipe; and the heating cylinder is provided with a steam discharge pipe which is communicated with the water storage tank. The second scheme adopted by the invention is as follows: a water storage tank is communicated with a heating cylinder through a check valve; the heating cylinder and a steam chamber are communicated with one end of a water outlet connecting pipe; the other end of the water outlet connecting pipe is communicated with a water channel; the water channel is communicated with the water storage tank through a water inlet connecting pipe; and the steam chamber is provided with a steam discharge pipe which is communicated with the water storage tank. Because the structure is adopted, the system is simple in structure and has a better operation effect, and the product provided by the invention is more competitive in markets.

The invention relates to a solid-propellant rocket engine capable of being ignited at a tail. The solid-propellant rocket engine comprises a combustion chamber, a spraying pipe component and a solid fuel, wherein the spraying pipe component is arranged at the tail end of the combustion chamber; and the solid fuel is arranged in the combustion chamber. The solid-propellant rocket engine further comprises an ignition box, an ignition tool and a firing mechanism thereof; the ignition box is arranged at the front end of the solid fuel in the combustion chamber; the ignition tool is arranged at the tail end of the spraying pipe component; the solid fuel is a cylinder; a gap is left between the outer side wall of the solid fuel and the inner side wall of the combustion chamber; and the spraying pipe combustion chamber end of the spraying pipe component is aligned to a center pipe of the solid fuel cylinder. The solid-propellant rocket engine can realize the mechanical firing and the tail ignition, can firstly ignite the solid fuel at the head of a rocket, and is stable in working performance.

The invention discloses a composite bactericide for industrial circulating cooling water. The composite bactericide for industrial circulating cooling water comprises dioctyl dimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride, methylene dithiocyanate and water. The composite bactericide for industrial circulating cooling water has the advantages of reasonable formula, good work effects and low production cost.

This invention refers to a new structured Schottky millimeter wave mixer diode. The chip epitaxy structure is to grow a heavily doped gallium arsenide first epitaxy layer on gallium arsenide substrate and to grow a light doped gallium arsenide second epitaxy layer on the first epitaxy layer. Said invention optimization designs epitaxy structure.

The invention discloses a floor brush of a dust collector and the dust collector. The floor brush of the dust collector comprises a shell, a first rolling brush and a second rolling brush, wherein thefirst rolling brush and the second rolling brush are different in function; the shell defines rolling brush containing grooves and an air duct, and the rolling brush containing grooves are communicated with the air channel; the first rolling brush and the second rolling brush are located in the rolling brush containing grooves, and the first rolling brush is located on the front side of the second rolling brush and is in contact with the second rolling brush. Therefore, the shell, the first rolling brush and the second rolling brush are matched so that large-particle objects can be preventedfrom being stuck at the first rolling brush, the problem that the large-particle objects are stuck by the first rolling brush can be effectively solved, then the working performance of the floor brushof the dust collector can be improved, the dust removal efficiency of the floor brush of the dust collector can be improved, and meanwhile, the satisfaction degree of a user can be improved.