247results about How to "Improve order" patented technology

The invention discloses an industrial internet-based equipment maintenance and management method, and relates to the technical field of industrial equipment maintenance and management. According to the method, the operation parameters in the set time interval are regularly extracted for comprehensive evaluation, in the aspect of operation parameter evaluation, the fault temperature index and the fault abnormal sound index are calculated, and the corresponding weight coefficient is set for calculating the fault evaluation index, so that the equipment fault risk degree can be more accurately quantified, the possible faults of the equipment can be predicted in advance, and the fault risk of the equipment can be accurately evaluated. A basis is provided for taking maintenance measures in time, loss caused by sudden equipment failures is reduced, performance parameters of prediction and evaluation equipment which does not trigger failure maintenance signaling are deeply analyzed to calculate a predictive evaluation index, and the predictive evaluation index is compared with a reference threshold index to trigger preventive maintenance signaling, so that the failure maintenance signaling is prevented from being damaged. The condition of excessive maintenance or insufficient maintenance is avoided, timely intervention can be performed when the equipment performance begins to decline but no serious fault is caused, the maintenance cost is reduced, and the service life of the equipment is prolonged.

The invention provides a polymer, a preparation method thereof, a positive pole piece, a secondary battery and an electric device. The polymer comprises a structure as shown in a formula I, X comprises a phosphate group or a phosphite group, R1 and R3 respectively and independently comprise at least one of a polyether chain segment, a polyester chain segment, hydrogen and alkyl, and at least one of R1 and R3 comprises the polyether chain segment or the polyester chain segment; and R2 comprises an organic chain segment. According to the polymer provided by the invention, the flexibility of a pole piece can be improved while the maximum solid content of positive electrode slurry is effectively improved, the filtering time is shortened and the production efficiency and quality of the pole piece are improved.

The invention discloses an intelligent scheduling method based on port bulk cargo transfer. The method comprises the steps of S1, obtaining related information of bulk cargos to be transferred and related information of transport vehicles; s2, matching transport vehicles of corresponding types; s3, calculating a transfer train number; s4, calculating the number of transport vehicles; when the number of the transport vehicles is one, executing the step S5; when the number of the transport vehicles is two or more than two, executing the step S6; s5, generating transfer scheduling planning information according to the loading position of the bulk cargo to be transferred and the departure position of the corresponding transport vehicle; s6, determining the departure sequence of the transport vehicles: for the first departure transport vehicle, calculating corresponding transfer scheduling planning information based on the step S5; and for the second transport vehicle and the subsequent departure transport vehicle, corresponding transfer scheduling planning information is generated according to the transfer scheduling planning information of the previous transport vehicle. According to the invention, the accuracy, orderliness and collaboration of bulk cargo transfer scheduling can be improved.

The invention relates to the technical field of man-machine interaction data, in particular to man-machine interaction equipment and a control method thereof. The method comprises the following steps: acquiring equipment screen operation data, performing time window segmentation, generating a discrete touch event sequence and a dynamic touch feature sequence, clustering and processing the features by utilizing interaction features, forming user operation behavior grouped data, and combining equipment historical interaction data to form a user operation behavior group. Frequent item set mining is carried out to identify a high-frequency operation mode, a user operation preference model is constructed, user operation habits are identified, redundant actions are eliminated, main interaction action data are extracted, interaction intention prediction is carried out on main interaction actions based on historical data of equipment, and dynamic response is carried out on the man-machine interaction equipment according to a prediction result. And effective control is realized. According to the invention, a more personalized and smoother man-machine interaction equipment control method is realized.

The invention relates to the technical field of tunnel environment monitoring, in particular to a tunnel environment real-time monitoring and evaluation system which comprises an environment monitoring module, a video monitoring module, a data transmission module, a data processing module, a ventilation adjusting module, a traffic signal control module, an information board issuing module and a user interaction module. The environment monitoring module collects tunnel environment data in real time, the video monitoring module obtains tunnel video data, the data transmission module transmits the data to the data processing module, and the data processing module processes the received data and evaluates the environment safety condition in the tunnel. The ventilation adjusting module automatically adjusts a ventilation system in the tunnel according to an evaluation result, the traffic signal control module automatically controls traffic lights, the information board issuing module issues early warning information through an electronic information board, and the user interaction module provides a visual interface; according to the invention, comprehensive, real-time and intelligent monitoring and adjustment of the environment in the tunnel can be realized, and the safety management level and the operation efficiency of the tunnel are improved.

The invention belongs to the technical field of back contact cells, and particularly relates to a back contact cell capable of reducing LID, a preparation method of the back contact cell and a cell assembly. The back contact cell capable of reducing the LID comprises a silicon wafer, and a light-receiving surface passivation layer and an anti-reflection layer which are sequentially arranged on a light-receiving surface of the silicon wafer, and the light-receiving surface passivation layer comprises a first tunneling oxide layer and a hydrogen-doped and carbon-doped silicon layer which are sequentially arranged; the silicon layer is amorphous silicon or polycrystalline silicon; the anti-reflection layer comprises a hydrogen-doped silicon carbide film layer, the hydrogen-doped silicon carbide film layer comprises a first hydrogen-doped silicon carbide layer and a second hydrogen-doped silicon carbide layer which are sequentially arranged, the carbon doping concentration of the first hydrogen-doped silicon carbide layer is smaller than that of the second hydrogen-doped silicon carbide layer, the thickness of the first hydrogen-doped silicon carbide layer is 10-30 nm, and the thickness of the second hydrogen-doped silicon carbide layer is 50-100 nm. According to the invention, the passivation effect, the optical effect and the LID anti-attenuation capability can be considered, the LID is reduced, the battery stability is improved, and the battery reliability is improved.

The invention provides an intelligent teaching material generation method, device, equipment, product and system based on a problem chain, and the method comprises the steps: obtaining teaching task information which comprises the course content of a target course and a teaching target; calling a pre-trained large language model to generate a problem chain of the target course based on the teaching task information, and generating a teaching design of the target course based on the problem chain; wherein the question chain comprises a plurality of questions which are used for guiding students to learn the course content and achieve the teaching target and have the association relationship. The problem is intelligently generated through the large language model to solve the guided teaching design, the students can be guided to gradually and deeply learn, the learning interest of the students is stimulated, the teaching process is more orderly and coherent, the students are helped to form a systematic knowledge framework, and the learning effect is improved.

The invention relates to a circuit board backdrill capacitance testing method, device and equipment and a storage medium, and the method comprises the steps: obtaining a capacitance detection instruction, and obtaining the image information of a to-be-detected circuit board according to the capacitance detection instruction; carrying out clustering analysis on the image information of the to-be-detected circuit board by adopting a k-means algorithm to obtain a feature image of the to-be-detected circuit board, and carrying out analysis according to the feature image to obtain a displacement distance and an angle of the probe; adjusting the position of the probe according to the displacement distance and the angle of the probe, and generating a capacitance measurement message after the adjustment of the probe is completed; according to the capacitance measurement message, calculating a capacitance value of the circuit board to be detected through a capacitance method, and comparing the capacitance value of the circuit board to be detected with a preset capacitance value to obtain a capacitance comparison result; and generating a quality evaluation result of the back drilling hole of the circuit board according to the capacitance comparison result, and transmitting the quality evaluation result of the back drilling hole of the circuit board to the user side. The method has the effect of improving the precision and efficiency of back drilling hole quality detection.

The invention provides a composite phase change heat storage material and a preparation method thereof, and belongs to the technical field of phase change heat storage materials. The nitrogen quantum dot doped porous carbon aerogel is used as a load carrier, meanwhile, the acidified paraffin is used as a phase change heat storage agent, and the titanium dioxide-carbon nanotube composite material is added for combined action, so that the phase change latent heat and the heat conductivity coefficient of the composite phase change heat storage material can be effectively improved, and good cycle stability is ensured.

The invention discloses a preparation method of ultra-high molecular weight polyethylene with consistent particle size distribution, which comprises the following steps: adding hexane into a first reaction kettle as a solvent, and adding a catalyst, raw materials ethylene and hydrogen into the first reaction kettle for prepolymerization reaction; after the pre-polymerization reaction, reaction slurry discharged from the first reaction kettle enters a second reaction kettle for polymerization reaction; and after polymerization is completed, reaction slurry discharged from the second reaction kettle is subjected to post-treatment, and a finished product is obtained. The catalyst comprises a main catalyst, a cocatalyst and an electron donor; the main catalyst is titanium tetrachloride doped with a magnesium compound; the cocatalyst is aluminum oxide loaded triethyl aluminum and / or diethyl aluminum chloride; the electron donor is a siloxane compound. According to the invention, through a prepolymerization process and catalyst optimization, high-quality ultra-high molecular weight polyethylene with super consistent particle size distribution is prepared.

The invention discloses a forestry seedling bed feeding and discharging device, and belongs to the technical field of seedling bed feeding and discharging, the forestry seedling bed feeding and discharging device comprises a top plate, the two sides of the bottom of the top plate are connected with supporting side plates, and one side of each supporting side plate is provided with a feeding mechanism and a discharging mechanism. According to the device, the feeding mechanism and the pushing plate are arranged, so that the seedling trays above can be driven to be supported, falling of the seedling trays above is avoided, the seedling trays can sequentially enter the conveying belt at a time, on one hand, a first lifting lead screw is matched with a first lead screw base to drive the position of a material storage box to change, and then the seedling trays are conveyed to the conveying belt; on the one hand, a worker can stack and store seedling trays at a low position, the difficulty of placing the seedling trays is reduced, the working efficiency is improved, on the other hand, through pushing and limiting of the pushing plate, single-time orderly feeding of the multiple seedling trays can be achieved, orderly feeding and placing of the seedling trays are facilitated, the mechanization degree is improved, and the feeding efficiency is improved.

The invention belongs to the technical field of thin film materials, and particularly relates to a transparent ultraviolet-proof composite film as well as a preparation method and application thereof. The transparent ultraviolet-proof composite film provided by the invention is prepared from the following raw materials: acetylated lignin, a halloysite nano material, chitosan and polyvinyl alcohol, the acetylated lignin is loaded on the halloysite nano material. The specific transparent ultraviolet-proof composite film disclosed by the invention has high transparency on the basis of ensuring that the passing rate of ultraviolet light with the wavelength of 200-400nm is less than 5%, the passing rate of visible light with the wavelength of 400-780nm reaches more than 60%, and meanwhile, the transparent ultraviolet-proof composite film also has high mechanical property, is capable of blocking moisture and oxygen, is good in biological safety and is degradable.

The invention discloses a file ferrying method and device, a storage medium and electronic equipment, and the method comprises the steps: an initiating end cloud disk determines a ferrying data file corresponding to a ferrying request initiated by a user, obtains a ferrying configuration file of the ferrying data file, and sends the ferrying configuration file to a server; the ferry data file and the ferry configuration file are sent to a ferry folder of the initiating end network, the receiving end cloud disk obtains the ferry data file and the ferry configuration file from the ferry folder of the initiating end network, and the receiving end cloud disk stores the ferry data file based on the ferry configuration file. By adopting the method and the device, the ferry configuration file and the ferry data file are sent to the cloud disk of the receiving end together, so that cloud disk file ferry between different independent networks is realized, the hierarchical relationship in the ferry data file can be ensured by utilizing the ferry configuration file, and the confusion of file contents after file ferry is avoided; and the order of file ferrying is improved.

The invention discloses cold-drawing equipment for machining precise seamless steel pipes, and belongs to the technical field of cold-drawing equipment.The cold-drawing equipment comprises a cold-drawing machine, a die drawing base and an I-shaped rail are installed on the cold-drawing machine, and a drawing trolley is connected to the I-shaped rail in a sliding mode; the discharging unit is rotationally connected to the side face of the I-shaped rail; and the driving unit is rotationally connected to the discharging unit. When the seamless steel pipe is subjected to cold drawing treatment, the end of the seamless steel pipe penetrates through the die drawing seat in a pipe pushing manner, the end is clamped by the clamping mechanism of the drawing trolley, and the drawing trolley is driven by the traction chain to move, so that the seamless steel pipe is subjected to cold drawing. Through the arrangement of the discharging unit and the driving unit, under the cooperation of the discharging unit and the driving unit, when one end of the steel pipe is separated from the die drawing base to be discharged, the steel pipe can fall into the arc-shaped containing groove, intermittently and horizontally stay and then roll out, and the steel pipe discharging orderliness is improved.

The invention relates to the technical field of insulating materials. The invention provides composite insulation paper with an adjustable dielectric constant and a preparation method thereof. The method comprises the step of preparing composite insulation paper with different dielectric constants according to cyanoethyl cellulose with different substitution degrees and carbon fluoride nanotubes with different fluorocarbon ratios. The dielectric constant of the composite insulation paper can be regulated and controlled according to the substitution degree of the cyanoethyl cellulose and / or the fluorocarbon ratio of the fluorinated carbon nanotubes, and the composite insulation paper has excellent insulation performance and thermal stability. Good application prospects are realized in the fields of transformers, high-performance motors, power capacitors and the like.

This invention relates to a carbon-coated electrode with controllable interface microenvironment, its preparation method, and its application. The carbon-coated electrode comprises a gas diffusion electrode substrate, a copper catalyst layer, and a carbon coating. The copper catalyst layer coats the outside of the gas diffusion electrode substrate, and the carbon coating coats the outside of the copper catalyst layer. The carbon coating forms a dense porous structure on the outside of the copper catalyst layer. The carbon particles in the carbon coating are 15–25 nm in size, and the copper catalyst layer contains several copper nanoparticles with a size of 60–100 nm. During fabrication, copper nanoparticles, a dispersant, and a binder are mixed to form a mixture containing copper nanoparticles, which is then uniformly sprayed onto the surface of the gas diffusion electrode to form the copper catalyst layer. Finally, a mixture of carbon-based nanomaterials and a dispersant is sprayed onto the surface of the copper catalyst layer to form the carbon coating. This invention uses a carbon coating to create hydrophobicity at the electrode interface, improving the interface microenvironment and enhancing the activity of CO electroreduction for ethylene production.

The utility model relates to the technical field of morchella esculenta production, and discloses a morchella esculenta culture shelf which comprises two supporting plates which are distributed up and down at an interval and a side shelf with the two ends fixedly connected with the supporting plates, culture assemblies for placing morchella esculenta stock seeds are arranged between the supporting plates, and the two culture assemblies are arranged in a front-and-back symmetry mode. The two culture assemblies are supported and fixed through the supporting assemblies and the supporting plates. The stock culture shelf has the advantages that a one-groove culture mode is adopted, the placing space of the culture shelf is reasonably utilized, stock seeds cannot be stacked when placed and cultured, taking out or placing operation of each stock seed becomes simple and fast, meanwhile, the air circulation on the shelf is guaranteed, and meanwhile the culture shelf is convenient to use. And the hypha development condition of the stock seeds can also be visually observed, so that the stock seeds are convenient to culture, load and take, and the orderliness and efficiency of production are improved.

The present invention relates to the technical field of communications, and in particular to a method, system, device and storage medium for checking duplicate traffic bills. The method for checking duplicate traffic bills includes obtaining a bill file to be billed, segmenting the bill file to be billed, and obtaining billing bill lines; inputting the billing bill lines into a preset bill duplication checking table to obtain bill query record results; when the bill query record result is that there is no bill record, updating the bill duplication checking table based on the billing bill line, and billing the bill line; when the bill query record result is that there is a bill record, obtaining query record data, determining the billing bill line to be billed according to the query record data, and updating the bill duplication checking table based on the billing bill to be billed. The present application has the effect of instantly processing a large number of bill files and improving the efficiency of bill file duplication checking.

The invention belongs to the technical field of electric digital data processing, and particularly relates to a PDC drill bit torsion impact signal collecting and processing method which comprises the steps that torsion data are segmented into a plurality of torsion data windows; determining the torsion waveform complexity of the torsion data window; determining the rotation speed slippage strength and the formation meshing complexity of the torsion data window; determining an adaptive order of an AR model of the torsion data window; and performing predictive filtering on the torsion data in the torsion data window to obtain a predictive residual sequence of the torsion data window, and extracting a torsion impact signal according to numerical characteristics of the predictive residual sequence. According to the method, the numerical characteristics of the torsion data and the rotating speed data are analyzed, the order of the AR model is self-adapted, the limitation of the AR model with the fixed order is overcome, background noise is filtered out, and the accuracy and robustness of the torsion impact signal are improved.

The present invention relates to the field of coating lines, and in particular to a combined drying tunnel for coating lines, comprising a base, on which drying tunnel one, drying tunnel two, and a discharging conveyor are sequentially connected, wherein an electric drive conveyor belt is arranged in the drying tunnel one, one end of the electric drive conveyor belt is installed with a material unloading rocker arm and extends into the drying tunnel two, and a rotating baking plate is installed in the drying tunnel two, and a plurality of self-rotating plates are rotatably installed on the upper part of the rotating baking plate, and the bottom of the self-rotating plates are connected with planetary gears, and each planetary gear is meshed and connected with a fixed gear arranged at the bottom of the rotating baking plate. In the present invention, the workpiece is dried through the drying tunnel one, and enters the drying tunnel two through the rotating baking plate for rotary drying, wherein the rotating baking plate cooperates with the self-rotating plate, the planetary gears, and the fixed gears to realize the self-rotating plate, and then drives the workpiece to rotate and dry, ensuring that all parts of the workpiece can be fully dried, avoiding the problem of uneven drying that may exist in the traditional drying tunnel, effectively improving the drying operation efficiency, and ensuring the quality of the finished workpiece.

The invention provides a power data transmission method and system based on cloud edge collaboration. The method comprises the following steps: firstly, acquiring first state data of power equipment and second state data of a corresponding supporting structure; performing correlation analysis based on the determined deformation parameter of the support structure and the waveform change of the first state data, and transmitting a risk level signal generated by analysis, the first state data and the second state data to a cloud end; comparing the second state data with a pre-stored safety range to obtain a comparison result; generating an acquisition control instruction based on a comparison result and issuing the acquisition control instruction to an electric power station side; and finally, adjusting the acquisition frequency according to the acquisition control instruction, and executing data acquisition and transmission according to the adjusted acquisition frequency. According to the technical scheme provided by the invention, the adaptive adjustment of the data acquisition frequency along with the equipment operation risk level is realized, and the transmission efficiency and the monitoring accuracy are also considered.

The invention discloses a whole-process method for improving the thermal diffusion coefficient of a tungsten-rhenium alloy plate through rhenium segregation. The whole-process method comprises the following steps: preparing tungsten powder and rhenium powder with different particle sizes in proportion to obtain uniformly mixed powder of the tungsten powder and the rhenium powder; carrying out cold isostatic pressing on the mixed powder and sintering to prepare a sintered blank; carrying out heating rolling deformation treatment on the sintered blank; and performing high-temperature annealing treatment. According to the method, local segregation of rhenium is formed in a tungsten-rhenium alloy sintered blank by strictly controlling the sizes of the added tungsten powder and rhenium powder, after thermal deformation, rhenium segregation blocks can form anisotropic rhenium component segregation, the tungsten-rhenium alloy shows a higher thermal diffusion coefficient in the RD direction, and after high-temperature annealing, the tungsten-rhenium alloy has a higher thermal diffusion coefficient in the RD direction. The thermal diffusion coefficient in each direction can be further improved, and the tungsten-rhenium alloy plate with the high thermal diffusion coefficient is obtained.

The utility model discloses a beating type walnut shelling machine, which is used for shelling walnuts and consists of an integral mechanism, a shell breaking device, a material distributing device and a power device. The principle of the shell breaking device is based on a crank-link mechanism, a motor transmits torque to a shell breaking mechanism through a driving shaft, and up-down beating and shell breaking are achieved; meanwhile, the driving shaft drives the driven shaft to rotate through the transmission chain, the driven shaft is connected with the grooved wheel mechanism, the material distribution disc rotates synchronously and intermittently, feeding, beating and material sweeping are completed, and kernels are swept out through the rotating disc and fall into a recycling bin. The problems that the walnut shell breaking process is complex, the processing cost is high, industrial shell breaking extrusion is uneven, small workshops and homes are inconvenient, and the kernel yield is low are solved. The device is of a pure mechanical structure, operation is easy and convenient, repair and maintenance are convenient, and the technology and maintenance cost is reduced; and the mechanism is simple in transmission and high in hull breaking precision, and can bring certain economic benefits.

The utility model relates to an endoscope handle which comprises a lens module, an optical fiber pressing plate and a lighting module. The optical fiber pressing plate comprises a pressing plate groove body which is fixed on the outer wall of the lens module; the lighting module comprises an optical fiber cable and an optical fiber connecting piece, and the optical fiber cable is arranged in the handle, penetrates through the pressing plate groove body to be connected with one end of the optical fiber connecting piece and extends to the other end; the other end of the optical fiber connecting piece is fixedly connected with the lens module; the optical fiber cable and the optical fiber connecting piece are used for providing incident light for the lens module; through overall arrangement of the interior of the handle, the position relation of the optical fiber cable in the endoscope handle is optimized, and the convenience and the function stability of the endoscope during use are improved.

The invention discloses a continuous fully automatic glove box packing machine, comprising a frame, on which a transverse conveying device is arranged, and on which a material taking device, a box sealing device, a material feeding device and a box sealing device are sequentially arranged along the conveying direction, wherein the two box sealing devices are respectively located on both sides of the frame, the material taking device can be used to realize the suction and unfolding of the packaging box, the box sealing device comprises a locking tongue interlocking device and a capping mechanism and respectively realizes the twisting interlocking of the left locking tongue and the right locking tongue of the packaging box and the capping of the upper end cover and the lower end cover, so that the whole process from material taking and unfolding of the glove packaging box to the single-side box sealing of the glove packaging box, and then to feeding stacks of gloves into the packaging box and the other side box sealing of the glove packaging box can be realized. The dependence on workers in the traditional glove processing process is reduced, the labor intensity of workers is reduced, and the overall processing efficiency is improved.

The invention relates to the technical field of audio sharing, in particular to a multi-user audio sharing method and system based on a le-audio Bluetooth headset. The method comprises the following steps of: acquiring a connection state and a topological structure of LE-Audio equipment in real time through a network discovery function of a Bluetooth protocol stack so as to generate a Bluetooth dynamic network topological graph; dividing the available bandwidth into a plurality of small-bandwidth channels based on the dynamic network topological graph, and allocating independent small-bandwidth channels for each user for audio transmission to form a plurality of parallel audio stream channels; modeling a multi-user audio sharing scene according to the audio stream channel to obtain a channel response matrix describing multi-user audio transmission characteristics; and performing adaptive dynamic adjustment on the audio transmitted in each small-bandwidth channel according to the channel response matrix to generate adaptive audio stream data. According to the invention, through small bandwidth division and multi-channel transmission, efficient transmission of multi-user bidirectional audio streams is realized.

The present invention discloses an equipment maintenance and management method based on the industrial Internet, and relates to the technical field of industrial equipment maintenance and management. The present invention performs comprehensive evaluation by regularly extracting operating parameters within a set time interval. In terms of operating parameter evaluation, the fault temperature index and the fault abnormal sound index are calculated, and the corresponding weight coefficient is set to calculate the fault evaluation index. The degree of equipment failure risk can be quantified more accurately, and possible equipment failures can be predicted in advance, providing a basis for timely maintenance measures, and reducing the losses caused by sudden equipment failures. At the same time, for predictive evaluation equipment that has not triggered fault maintenance signaling, its performance parameters are deeply analyzed to calculate the predictive evaluation index, and compared with the reference threshold index to trigger preventive maintenance signaling, avoiding excessive or insufficient maintenance, and being able to intervene in time when equipment performance begins to decline but has not yet caused serious failures, thereby reducing maintenance costs and extending the service life of equipment.

The utility model relates to the related technical field of nut production equipment, one embodiment of the utility model provides a nut cold header facilitating material receiving, the nut cold header comprises a machine body and a fixing plate, the fixing plate is fixed to the side surface of the machine body, a material receiving frame is arranged outside the fixing plate, and a position adjusting assembly is arranged between the material receiving frame and the fixing plate; the conveying and arranging assembly is arranged in the material receiving frame and comprises a baffle, the baffle is fixed to the inner side surface of the material receiving frame, a long groove is formed in the surface of the material receiving frame, a through hole is formed in one end of the bottom in the long groove, a bottom frame is arranged at the bottom of the material receiving frame, and a conveying belt is installed in the bottom frame. By means of the technical scheme, the technical problem that in the related technology, equipment production needs to be intermittently stopped to replace a container for collecting nuts, and the production efficiency is affected is solved.

The utility model relates to a basic nursing trolley, which belongs to the technical field of nursing trolleys, and comprises a trolley body, a trolley body and a trolley frame, the first openings are formed in the two sides of the trolley body respectively and communicate with the storage space, and a pair of vertical plates is arranged on the two sides of each first opening and rotationally connected with the two side walls of the corresponding first opening respectively; the turnover doors are arranged on the two sides of the vehicle body respectively, the upper ends of the turnover doors are connected with the upper end wall of the first opening in a turnover mode, a pair of limiting grooves is formed in the side, close to the vehicle body, of each turnover door, and when the pair of vertical plates rotate to the position under the pair of limiting grooves, the pair of vertical plates are connected with the pair of limiting grooves in a clamped mode, so that the turnover doors serve as bearing platforms. After the turnover doors on the two sides of the nursing trolley are opened, when the vertical plate rotates to the position under the limiting groove to be clamped, the turnover doors can serve as a bearing platform, the operation space and the area for containing objects are increased, and use is flexible and convenient.