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39results about How to "Achieve orderly control" patented technology

Charging control method and system for charging station

The invention relates to a charging control method and system for a charging station. The method comprises following steps: charging demand data of the charging station in a set cycle is collected and analyzed, and distribution parameters of historical charging demands in each sub-cycle are obtained; demand prediction data of the charging station in the next cycle is calculated according to the distribution parameters; a charging scheme of the charging station is set according to the demand prediction data, wherein the charging scheme comprises charging modes, charging equipment access time and charging power; the charging process of the charging station is controlled in the next cycle according to the charging scheme. With the adoption of the technical scheme of the charging control method and system for the charging station, the charging process of the charging station is controlled orderly, the charging demand of each electric automobile is met, and the charging cost of the charging station is reduced.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1

Hydraulic automatic cleaning device for coal bunker and cleaning method thereof

The invention relates to a hydraulic automatic cleaning device for a coal bunker. The hydraulic automatic cleaning device comprises a PLC (Programmable Logical Controller) control cabinet (15) and a coal flow sensor (14) arranged above a belt conveyor (3), wherein a hydraulic coal clearing device for discharging coal is arranged on the side wall of each lower chute (5) of the coal bunker; each hydraulic coal clearing device comprises a servo motor driving device arranged on the outer side of the corresponding lower chute (5), a worm (6) which is arranged on the inner side wall of the lower chute (5) and is connected with an output shaft of the servo motor driving device, a worm wheel (7) which is arranged on the inner side wall of the lower chute (8) and is driven in cooperation with the worm (6), a spray head protection plate (8) swinging along with a mandrel of the worm wheel (7), a high pressure spray head (9) fixed to the spray head protection plate (8), a water pipe (10) with an electric gate valve, a first limiter (11) arranged on the upper side of the spray head protection plate (8), and a second limiter (12) arranged on the lower side of the spray head protection plate (8). By adopting the hydraulic automatic cleaning device, the phenomenon of coal blockage in the coal bunker can be solved rapidly, and the working efficiency is increased greatly.
Owner:李 长龙

Vehicle traffic control method and device, and server

The application belongs to the technical field of road traffic, especially relates to a vehicle traffic control method and device and a server. The control method includes: receiving a road traffic instruction acquiring request from a vehicle on one side of a single lane; acquiring a remote sensing image corresponding to the current position information of the vehicle according to the current position information of the vehicle carried in the road traffic instruction acquiring request; performing image recognition on the remote sensing image, to acquire first vehicle information, second vehicle information and third vehicle information; analyzing the first vehicle information, the second vehicle information and the third vehicle information, and transmitting corresponding road traffic instructions to the vehicle on one side of the single lane and a vehicle on the other side of the single lane respectively according to a predetermined traffic rule, the road traffic instructions being used for instructing the traffic order for the vehicles. The invention overcomes the technical problem of low vehicle traffic efficiency of the single lane and a potential safety hazard in the prior art.
Owner:LAUNCH TECH CO LTD

Power control method for charging piles in residential area

The invention discloses a power control method for charging piles in a residential area. The method comprises the steps as follows: a gateway meter is arranged on each of a resident load and a charging pile load in the residential area; a data acquisition unit acquires real-time power and power consumption data of two gateway meters and real-time power and state information of charging piles through broadband carrier communication; the data acquisition unit transmits the data to a data analysis unit; a strategy making unit makes a charging strategy according to a data analysis result and transmits the charging strategy to a control unit; and the control unit issues the charging strategy to an execution unit and controls charging power of the charging piles through the execution unit. According to the power control method, real-time communication of the charging piles, a residential area distribution network and an energy management system is achieved through a broadband carrier communication technology, power control on the charging piles in the residential area is achieved through the execution unit, ordered control on charging pile groups in the residential area is achieved, theutilization efficiency of the charging piles is improved and resource waste and distribution network transformation of the residential area are reduced.
Owner:STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1

HOST-BOX server stability test method and device, terminal and storage medium

The invention discloses a HOST-BOX server stability test method and device, a terminal and a storage medium. The method comprises the steps of obtaining a BMC IP of a HOST machine and a BMC IP of a BOX machine of a test server; setting an execution sequence and interval time according to the BMC IP of the HOST machine and the BMC IP of the BOX machine; setting test times; Controlling the test server to restart and recording restart times by using ipmitool according to the execution sequence and the interval time; And controlling a stability test process according to the restart times and thetest times. According to the invention, the BMC IP of the HOST machine of the test server and the BMC IP and execution sequence opinion interval time of the BOX machine are acquired, so that the ordered control of each component machine of the test server in the restart execution process is realized, and the restart stability test of HOST-BOX server is further realized.
Owner:ZHENGZHOU YUNHAI INFORMATION TECH CO LTD

Biomass-oil catalytic hydrogenation reaction device and catalytic hydrogenation method thereof

The invention discloses a biomass-oil catalytic hydrogenation reaction device. The biomass-oil catalytic hydrogenation reaction device comprises a reaction tower, a lift pipe fixed in the inner cavity of the reaction tower through a support, a temperature sensing probe arranged in the inner cavity of the reaction tower, a catalyst reactivation device, a gas-liquid separator, a hydrogen source, a biomass crude oil storage tank, an oil transfer pump, a refined oil product storage tank, a flow control device, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a first compressor, a second compressor, a first heat exchanger and a second heat exchanger. The invention also discloses a catalytic hydrogenation method of the biomass-oil catalytic hydrogenation reaction device, wherein the catalytic hydrogenation method comprises the steps of cooling hydrogen circulation, reactive hydrogen circulation, a catalyst reactivation circulation, and regulation and control on biomass oil channel and hydrogen flow. The biomass-oil catalytic hydrogenation reaction device solves the temperature control problem in the catalytic hydrogenation reaction, the heat dissipation problem and the immediate reactivation problem of the deactivated catalyst.
Owner:SOUTHEAST UNIV

Centralized safety analysis method, device and system for multi-component electric quantity decentralized transaction of multiple power plants

ActiveCN109447370AImproving the ability to guarantee safe operationAvoid disorderly developmentForecastingResourcesStart stopEngineering
The invention discloses a centralized safety analysis method, device and system for multi-component electric quantity decentralized transaction of multiple power plants. The method comprises the stepsof enabling the power plants to report annual electric quantity monthly arrangement plan data and monthly electric quantity market transaction plan data in a rolling mode; establishing a multi-powerplant centralized electric quantity safety analysis optimization model; establishing a multi-component electric quantity balance constraint and sub-component electric quantity adjustment range constraint model of the power plant based on the data reported by the power plant; Setting different adjustment costs for the multi-component electric quantity plan of the power plant in the objective function; calculating the start-stop state of the unit in each time period and the multi-component electric quantity plan deviation of the power plant; and issuing the medium-and-long-term electric quantitysafety analysis conclusion to the power plant. Aiming at medium and long term physical transactions of power generation enterprises, the safety analysis services before transactions are provided, safety analysis conclusions and adjustment suggestions of multi-component electric quantity decentralized transactions of multiple power plants are given, the market transaction reference is provided, market members are guided to continuously correct the medium and long term physical transactions, and the performability of various power transactions is guaranteed.
Owner:NARI TECH CO LTD +2

Biomass-oil catalytic hydrogenation reaction device and catalytic hydrogenation method thereof

The invention discloses a biomass-oil catalytic hydrogenation reaction device. The biomass-oil catalytic hydrogenation reaction device comprises a reaction tower, a lift pipe fixed in the inner cavity of the reaction tower through a support, a temperature sensing probe arranged in the inner cavity of the reaction tower, a catalyst reactivation device, a gas-liquid separator, a hydrogen source, a biomass crude oil storage tank, an oil transfer pump, a refined oil product storage tank, a flow control device, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a first compressor, a second compressor, a first heat exchanger and a second heat exchanger. The invention also discloses a catalytic hydrogenation method of the biomass-oil catalytic hydrogenation reaction device, wherein the catalytic hydrogenation method comprises the steps of cooling hydrogen circulation, reactive hydrogen circulation, a catalyst reactivation circulation, and regulation and control on biomass oil channel and hydrogen flow. The biomass-oil catalytic hydrogenation reaction device solves the temperature control problem in the catalytic hydrogenation reaction, the heat dissipation problem and the immediate reactivation problem of the deactivated catalyst.
Owner:SOUTHEAST UNIV

Registration information processing method and system, terminal device and control device

The invention provides a registration information processing method. The method includes obtaining identity information of a registration object owning a drone from a terminal device; generating a registration certificate based on the identity information of the registration object; acquiring equipment of at least one drone owned by the registration object from the terminal device; correlating theequipment information of the at least one drone with the registration certificate. The invention also includes a registration information processing system, terminal device and control device. According to the invention, problems of registration number waste due to registration of each drone and drone space resource waste or space insufficiency due to too long registration numbers are avoided.
Owner:SZ DJI TECH CO LTD

Material cooler with uniform and controllable discharging function

A material cooler with a uniform and controllable discharging function comprises a storage bin and a discharge hopper positioned below the storage bin, wherein an impeller discharging device for controlling discharging is mounted between the storage bin and the discharge hopper; an upper level detector and a lower level detector which are used for detecting the material height are arranged in thestorage bin and are electrically connected with a discharging controller; the discharging controller is in control connection with a driving part of the impeller discharging device; the impeller discharging device comprises a driving motor and an impeller component in driven connection with the driving motor through a transmission component; and the driving motor is electrically connected with thedischarging controller. According to the material cooler, the material conveying efficiency can be adjusted through setting the specification of impellers and controlling the operating speeds of theimpellers, the material conveying quantity is counted according to rotation of the impellers, so that a material can be orderly discharged in a controllable manner; quantization and ordered control ofdischarging are realized by use of the impellers; and meanwhile, through optimal design of the structure of the material cooler, the material cooling uniformity is improved, and material accumulationand leakage are prevented.
Owner:广州天地实业有限公司

Bidirectional train control method and device and computer readable storage medium

An embodiment of the invention discloses a bidirectional train control method and device and a computer readable storage medium. Bidirectional control of a train line is realized under the condition that communication cables among logic control units are not increased additionally. The method comprises the steps as follows: a level transmission direction signal is added to the current logic control unit; when the current logic control unit unlocks the level transition direction, the signal form of the direction signal is adjusted according to input conditions of level signals at two input endsof the train line of the current logic control unit; when the train line function of the current logic control unit locks the transmission direction, levels of output ends corresponding to the inputends are adjusted according to the direction type of the direction signal and a control command, so that levels of the output ends of the current logic control unit are matched with the direction signal; the level signal of a target output end is transmitted to an input end of the next logic control unit. The working mode of the current logic control unit is referred, and ordered control of the whole bidirectional train can be realized.
Owner:ZHUZHOU ELECTRIC LOCOMOTIVE CO

Updraft multistage automatic cup distributing system

The invention discloses an updraft multistage automatic cup distributing system which comprises an updraft conveyer, a cup discharging component and a fan, wherein the updraft conveyer is arranged rightly above the cup discharging component which comprises at least one cup discharging cylinder, an air inlet of the fan is connected with the updraft conveyer, and an air outlet of the fan is connected with the cup discharging component. The updraft multistage automatic cup distributing system disclosed by the invention has the advantages as follows: the upright conveyer is arranged rightly above the cup discharging component, plastic cups can directly fall into the cup discharging component by negative pressure generated by the cup discharging cylinder and self gravity of the plastic cups, so the cup discharge is more reliable and timely simultaneously with decreasing the wind energy and saving the energy consumption; and the cup discharging component comprises at least one cup discharging cylinder, so that one upright conveyer can be corresponding to at least one subsequent device by one cup discharging component to simplify the structure of the whole system.
Owner:岸宝环保科技(南京)有限公司

A storage system for original glass sheet and its application method

The invention belongs to the technical field of glass processing equipment, and specifically relates to a storage system for raw glass sheets and a method for using the same. The storage system for raw glass sheets includes a guide rail, a loading station and a patching station arranged on one side of the guide rail location, storage glass shelf, glass shelf, support roller, Y-axis trolley and X-axis trolley arranged on the other side of the guide rail. set in the traction lugs arranged at both ends of the glass rack, and drive the glass rack to move on the support roller between the patch station and the storage glass rack, or between the storage glass rack and the loading station Move on the support roller shaft; the invention cooperates with the Y-axis trolley and the X-axis trolley to make the glass frame move back and forth on the support roller shaft between the patch station, the storage glass shelf and the loading station, realizing the alignment The orderly control of the original glass sheet realizes the high-efficiency feeding of the loading table and improves the processing efficiency of the original glass sheet.
Owner:ANHUI YINRUI GLASS MACHINERY

Vehicle anti-creeping energy absorption device

The invention provides a hinge spring type vehicle anti-creeping energy absorption device. The device is mainly composed of a front end anti-creeping structure, a rear end installation structure and amiddle hinge type spring energy absorption structure. The middle hinge type spring energy absorption structure is composed of an inner connecting rod, an outer connecting rod, a pin column and a spiral spring, and comprises five hinge type spring energy absorption basic units from top to bottom, and the torsional rigidity of the spiral spring is sequentially increased. When a vehicle collides ata low speed, the spiral spring generates recoverable elastic torsion to store energy, and the anti-creeping energy absorption device is not damaged; when a vehicle collides at a high speed, the spiralspring generates unrecoverable plastic deformation to absorb energy; and the rigidity of the spiral spring controls the deformation sequence of the energy absorption structure, and the five hinge type spring energy absorption basic units deform in sequence from top to bottom. According to the invention, the technical problems of serious waste, high maintenance cost and unstable energy absorptionsequence of the traditional energy absorption structure for low-speed collision of the railway vehicle can be effectively solved, and the collision resistance of the railway vehicle can be effectivelyimproved.
Owner:SOUTHWEST JIAOTONG UNIV

Registration information processing method and system, terminal equipment and control equipment

A method for processing registration information, the method comprising: obtaining from a terminal device the identity information of a registration object holding a drone; generating a registration certificate based on the identity information of the registration object; obtaining from the terminal device the Equipment information of at least one drone; associating the equipment information of at least one drone with the registration certificate. It also includes a registration information processing system, terminal equipment and control equipment. This method avoids the problem of waste of registration number caused by registration of each UAV and the problem of waste of UAV space resources or insufficient space caused by too long registration number.
Owner:SZ DJI TECH CO LTD

Authority control method and device, server and storage medium

The invention discloses an authority control method and device, a server and a storage medium. The authority control method is applied to the server. The permission control method comprises the following steps: receiving a first control request sent by a first client, wherein the first control request is used for acquiring a control permission of the first client to a camera of a target live broadcast room; adding the first control request to a request queue, and arranging the control requests in the request queue according to a sequence of request time; and when the second client corresponding to the second control request finishes controlling the camera, transferring the control authority of the camera to the first client, so that the first client controls the camera to shoot the live broadcast commodity based on the input camera control operation and the control authority, the second control request being a previous control request before the first control request in the request queue. According to the method, the authority of the client for controlling the camera in the live broadcasting room can be controlled, and the control of the camera is prevented from being disordered and abnormal.
Owner:广州方硅信息技术有限公司

Reserved auto-switch-on method requiring free setting of fixed value based on trend direction partition topology

The invention relates to a reserved auto-switch-on method requiring free setting of a fixed value based on a trend direction partition topology. The reserved auto-switch-on method is applied to powersystem network, wherein the power system network comprises a plurality of reserved auto-switch-on areas which are subjected to superior-junior series connection; and each of the reserved auto-switch-on areas comprises four kinds of equipment including a superior power supply, a corresponding level bus bar and incoming line, a corresponding level bus bar outgoing line, wherein the corresponding level bus bar outgoing line is used as the superior power supply of the next level of reserved auto-switch-on area. The reserved auto-switch-on method comprises the following steps: acquiring configuration parameters of all equipment in the power system network; judging the state of all equipment according to the configuration parameters and preset criterions; controlling the various reserved auto-switch-on areas, and searching the topmost level of reserved auto-switch-on area which can recover the power supply to apply the auto-switch-on action according to the sequences from the superior to thejunior in association with the configuration parameters, the state of the equipment and the action logic of the reserved auto-switch-on. According to the reserved auto-switch-on method disclosed by the invention, reserved auto-switch-on fixed values are not needed to be set from mounting and debugging of the device to operating maintenance.
Owner:BEIJING SIFANG JIBAO AUTOMATION

Force and flow field correlation asynchronous measurement method and system

The invention relates to the technical field of flow field measurement. In order to solve the problem that in an existing multi-sensor asynchronous measurement mode, control operation is complex due to the fact that effective triggering time sequence control over work of all sensors is lacked, the force and flow field correlation asynchronous measurement method is provided and comprises the following step: test system construction: installing a test model and measurement equipment; parameter setting: setting acquisition parameters of the measurement equipment; acquisition time sequence setting: drawing up the acquisition time sequence of the measurement equipment; and data acquisition: after the test area operates stably, controlling measurement equipment to perform measurement according to an acquisition time sequence to obtain measurement data. According to the scheme, orderly control over the measuring equipment is achieved.
Owner:CHINA AUTOMOTIVE ENG RES INST +1

Updraft multistage automatic cup distributing system

The invention discloses an updraft multistage automatic cup distributing system which comprises an updraft conveyer, a cup discharging component and a fan, wherein the updraft conveyer is arranged rightly above the cup discharging component which comprises at least one cup discharging cylinder, an air inlet of the fan is connected with the updraft conveyer, and an air outlet of the fan is connected with the cup discharging component. The updraft multistage automatic cup distributing system disclosed by the invention has the advantages as follows: the upright conveyer is arranged rightly above the cup discharging component, plastic cups can directly fall into the cup discharging component by negative pressure generated by the cup discharging cylinder and self gravity of the plastic cups, so the cup discharge is more reliable and timely simultaneously with decreasing the wind energy and saving the energy consumption; and the cup discharging component comprises at least one cup discharging cylinder, so that one upright conveyer can be corresponding to at least one subsequent device by one cup discharging component to simplify the structure of the whole system.
Owner:岸宝环保科技(南京)有限公司

Transferring structure and printer

The invention discloses a transferring structure and a printer. The transferring structure comprises a turnover wheel, a conveying mechanism and a photographing system located above the conveying mechanism. The turnover wheel and the conveying mechanism sequentially convey cards. The conveying mechanism comprises a clamping assembly receiving the cards and a horizontal movement assembly driving the clamping assembly to get close to or away from the portion below the photographing system. According to the transferring structure, by arranging the horizontal movement assembly, manual transferringis replaced, the cards can be automatically moved to the photographing system to be photographed, and the photographing efficiency is improved. Furthermore, by arranging the clamping assembly, the cards can be fixed, it is ensured that the cards are accurately transferred, and it is avoided that the cards deviate and fall. Furthermore, by arranging the turnover wheel, the cards can be overturned,and therefore the other faces of the cards can be conveniently photographed, subsequent processing of the cards is also facilitated, printing and photographing of the cards can be automatically and continuously conducted, and the manufacture efficiency of the cards is improved.
Owner:JIANGMEN DASCOM COMP PERIPHERAL +1

A coal bunker hydraulic automatic plugging removal device and its cleaning method

The invention relates to a hydraulic automatic cleaning device for a coal bunker. The hydraulic automatic cleaning device comprises a PLC (Programmable Logical Controller) control cabinet (15) and a coal flow sensor (14) arranged above a belt conveyor (3), wherein a hydraulic coal clearing device for discharging coal is arranged on the side wall of each lower chute (5) of the coal bunker; each hydraulic coal clearing device comprises a servo motor driving device arranged on the outer side of the corresponding lower chute (5), a worm (6) which is arranged on the inner side wall of the lower chute (5) and is connected with an output shaft of the servo motor driving device, a worm wheel (7) which is arranged on the inner side wall of the lower chute (8) and is driven in cooperation with the worm (6), a spray head protection plate (8) swinging along with a mandrel of the worm wheel (7), a high pressure spray head (9) fixed to the spray head protection plate (8), a water pipe (10) with an electric gate valve, a first limiter (11) arranged on the upper side of the spray head protection plate (8), and a second limiter (12) arranged on the lower side of the spray head protection plate (8). By adopting the hydraulic automatic cleaning device, the phenomenon of coal blockage in the coal bunker can be solved rapidly, and the working efficiency is increased greatly.
Owner:李 长龙

Servo control distribution system of battery weighing machine

ActiveCN102745486BPrevent the phenomenon of full warehouseAvoid stuck battery phenomenonConveyorsConveyor partsElectricityInlet channel
The invention discloses a servo control distribution system of a battery weighing machine. The servo control distribution system comprises a battery conveying belt (1), a battery outlet channel (2), two battery inlet channels (3), and two pulling wheel mechanisms corresponding to the battery inlet channels (3), wherein the battery conveying belt (1) is driven by a driving chain wheel (4) and two driven chain wheels (5); the pulling wheel mechanism comprises a pulling wheel (6) and a servo motor (7) for driving the pulling wheel (6); each battery inlet channel (3) is provided with two approach switches with different mounting heights; the approach switches (8) are electrically connected with the servo motor (7); and rotating shafts of the two driven chain wheels (5) are provided with encoding devices (9), and the encoding devices (9) are electrically connected with the servo motor (7). The servo control distribution system of the battery weighing machine effectively prevents the phenomenon that materials are fully filled in a cabin and prevents the phenomenon that a battery is clamped after the materials are emptied and the servo control distribution system is restarted; and sequential control of feeding the materials is realized and the reliability of products is improved.
Owner:ZHENGJIANG MUSTANG BATTERY CO LTD

Pipe stamping and cutting device for building construction based on notch control

The invention belongs to the technical field of non-cutting machining, and particularly relates to a pipeline stamping and cutting device for building construction based on notch control. The invention discloses a pipeline stamping and cutting-off device for building construction based on notch control. The pipeline stamping and cutting-off device comprises a fixed-point limiting type external expansion type cutting-off mechanism, an internal jacking type bulge regulation and control mechanism, a hydraulic driving assembly and a lifting regulation mechanism. On the basis of the hydraulic and pneumatic transmission principle, a fixed-point limiting type external expansion type cut-off mechanism is creatively provided, and under the condition that no hydraulic control valve exists, serialization control over the two working procedures of stamping and cut-off is achieved only through an ingenious hydraulic and limiting structure; the invention further creatively provides an internal jacking type bulge regulation and control mechanism, the shape of the arc-shaped bulge is controlled, the sealing bowl opening can be automatically pre-tightened through internal pressure, and when the water pressure is increased, the pre-tightening force between the sealing bowl opening and the to-be-cut-off pipeline body can be adaptively increased to prevent the to-be-cut-off pipeline body from falling off along with the increase of the pre-tightening force between the sealing bowl opening and the to-be-cut-off pipeline body.
Owner:SHANDONG POLYTECHNIC COLLEGE

A method for controlling the power of charging piles in residential quarters

The invention discloses a method for controlling the power of a charging pile in a residential quarter, which includes: installing a gateway meter on the residential load and the charging pile load in the residential quarter; The power data and the real-time power and status information of the charging pile; the data acquisition unit transmits the above data to the data analysis unit; the policy formulation unit formulates a charging strategy according to the data analysis results, and sends the charging strategy to the control unit; the control unit will download the charging strategy Send it to the execution unit, and control the charging power of the charging pile through the execution unit. The present invention realizes the real-time communication between the charging pile, the residential area distribution network and the energy management system through the broadband carrier communication technology, realizes the power control of the charging pile in the residential area through the execution unit, and achieves the orderly control of the charging pile group in the residential area. Improve the utilization efficiency of charging piles, reduce the waste of resources and the transformation of distribution network in residential areas.
Owner:STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1

Device for leveling building ground

PendingCN114837385AIt is not easy to control, and there is no disadvantage of pre-rolling processAdaptableClimate change adaptationBuilding constructionsArchitectural engineeringStructural engineering
The invention provides a building ground leveling device, and relates to the field of constructional engineering, the building ground leveling device comprises a scraper assembly, an arc rod, a support rod and a group of rollers, the bottom end of the arc rod is movably connected to the scraper assembly, the top end of the arc rod sleeves the support rod, the support rod comprises a handle, a straight rod and a rolling shaft from top to bottom, the group of rollers are pivoted to the rolling shaft, and the handle is movably connected to the straight rod. According to the building ground leveling device, the scraper assembly is arranged at the lower end of the arc rod, the supporting rod is hinged to the arc rod, the roller is pivoted to the lower portion of the supporting rod, the scraper assembly is driven to move forwards under the condition that the roller is trodden manually, and the concrete ground is firstly rolled and then leveled; the defects that the direction of a traditional smoothing rod is difficult to control, and a front rolling process does not exist are overcome.
Owner:ZHEJIANG TIANGONG CONSTR GRP
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