Abstract: Disclosed in the present application are a concrete protection material, and a preparation method and a construction method therefor. The concrete protection material consists of 50%-90% of a component A and 10%-50% of a component B in percentage by weight, where the component A is prepared from 30%-65% of organic silicon, 2%-5% of nano-silicon dioxide and the balance of an organic solvent in percentage by weight; and the component B is prepared from 20%-50% of an organic base and the balance of water in percentage by weight. The present application not only can form nano-particles having a strengthening effect in capillary channels of a concrete surface layer, but also can achieve a technical effect of superhydrophobicity on the concrete surface layer.

Abstract: The invention provides a lithium-ion battery electrode piece and a lithium-ion battery including the same. The electrode piece includes an electrode active material layer disposed on the surface of the current collector and a protective layer disposed on the surface of the electrode active material layer. The protective layer is composed of metal oxide layers and conductive layers alternately stacked in the horizontal direction. The area ratio of the metal oxide layers to the conductive layers is 4:1-1:4, and the thickness ratio is 0.5:1-1:1. According to the invention, by regulating the shape and ratio of the high temperature stability material and the conductive active material on the electrode piece in the process of coating the protective layer, the amount of the two coating materials is precisely controlled to implement the precise regulation of the high temperature stability and rate performance of the electrode piece.

Abstract: The present disclosure provides a pilot proportional control valve apparatus, an automatic calibration method, engineering machinery and a storage medium, and relates to the technical field of engineering machinery, wherein the pilot proportional control valve apparatus including a hydraulic system and a controller; the hydraulic system including: a plurality of proportional pressure reducing valves, a calibration reversing valve, and a pressure sensor; the calibration reversing valve including a plurality of reversing units, an output end of each proportional pressure reducing valve being respectively connected with an input end of one corresponding reversing unit; the pressure sensor being arranged in a detection oil path; the controller performing calibration processing on the proportional pressure reducing valve according to a pilot oil detection pressure and an output pressure value of the proportional pressure reducing valve.

Abstract: Embodiments of the present disclosure provide a method for welding cell strings and a series welding machine. The method includes: forming an arrangement of a plurality of solar cells; inspecting the arrangement of the plurality of solar cells; providing a plurality of initial welding strips including first initial welding strips and second initial welding strips, the first initial welding strips interleave with the second initial welding strips in a first direction; cutting each of the first initial welding strips at first cutting positions, and cutting each of the second initial welding strips at second cutting positions, to obtain a plurality of welding strips; moving each welding strip in a second direction to form a set of welding strips; transferring the set of welding strips onto the arrangement of the plurality of solar cells; and welding the plurality of welding strips to corresponding solar cells to form a cell string.

Abstract: The present disclosure discloses a method for preparing a hierarchical porous material for a molecular sieve with an MFI structure. In the present disclosure, porous silicon dioxide is used as a carrier on a surface of which a nano zeolite seed is loaded, and then subjected to treatment with a secondary growth compound fluid and hydrothermal crystallization, so that a nano zeolite molecular sieve membrane is further grown on the surface of the porous silicon dioxide. The specific surface area and pore volume of the hierarchical porous material for the molecular sieve with the MFI structure prepared by the present disclosure are greatly improved compared with those of the original porous silicon dioxide. The material not only has the macroporous structure of the porous silicon dioxide, but also incorporates micropores of the molecular sieve itself and mesopores formed by molecular sieve agglomeration.

Abstract: The disclosure provides a mower. The mower includes a vehicle frame, a walking assembly, a working assembly, a seat and a battery pack. The walking assembly includes a first walking wheel assembly and a second walking wheel assembly connected with the vehicle frame. The first walking wheel assembly and/or the second walking wheel assembly includes a main walking wheel and a hub motor, the main walking wheel is connected with the hub motor, and the hub motor is arranged outside a side of the vehicle frame. The working assembly is connected with the vehicle frame. The seat is arranged on the vehicle frame. The battery pack is lowered and mounted on the vehicle frame and extends below the seat.

Abstract: The mower fleet management device is configured to control a plurality of mowers to work in collaboration. Each of the mowers includes an on-board communication module and an on-board positioning and navigation module. The mower fleet management device includes: a map loading module configured to acquire a map of a working land parcel; a control terminal communication module configured to wirelessly communicate with the on-board communication modules to acquire status information of the mowers; and a working region assigning module configured to assign a working region to each of the mowers according to the status information and the map. The on-board positioning and navigation module of each of the mowers guides the mower to work in the corresponding working region according to the assigned working region.

Abstract: An end cover assembly, an air cylinder, a tread sweeper and a railway vehicle.

Abstract: The present invention provides a speed measurement method and apparatus using a plurality of cameras. The speed measurement method includes: S1: calibrating positions of the respective cameras in a camera group, which are on a mobile platform at fixed relative positions; S2: obtaining a sequence of synchronized images from the respective cameras in the camera group, and recording time stamps thereof; and S3: performing a registration on the images captured by the respective cameras in the camera group and, if a registration result of two of the images is greater than a first threshold, calculating a position transformation matrix for the two images, and then calculating a position transformation matrix for the mobile platform based on the positional relationships between the cameras that captured the two images, and finally calculating a speed information of the mobile platform based on the position transformation matrix and an interval between times when the two images were captured.

Abstract: An air guide ring for an air conditioner outdoor unit is provided. The air guide ring includes an air guide ring body. An air guide channel is defined in the air guide ring body. The air guide ring body includes a first limiting portion and a second limiting portion. The first limiting portion and the second limiting portion are configured to fit with a fixing member of the air conditioner outdoor unit and to implement bi-directional limiting, so as to prevent inward contraction deformation and outward expansion deformation of the air guide ring body from occurring.

Abstract: For the problem of difficult roof anchor withdrawal at the end of a working face, a static crushing directional anchor withdrawal method at the end of a large-mining-height working face is provided. The method includes the following steps: designing key parameters of boreholes for static crushing, including a borehole position, a spacing between boreholes, a borehole depth, and a borehole diameter at the end of a working face; then determining parameters of a static crushing agent grouting technology device for the construction of a static crushing process; and carrying out an anchor withdrawal operation at the end.

Abstract: A flexible display panel and a preparation method therefor, and a display device and a display module are provided. The flexible display panel includes a planar area, a first bending area, a second bending area and a corner bending area. The corner bending area is connected to a corner of the planar area and is connected between the first bending area and the second bending area, and is provided with a plurality of first hole groups, where the corner bending area is bent with a width of a first hole group in middle of the corner bending area increasing and a width of a first hole group in an edge area on a side of the corner bending area away from the planar area decreasing.

Abstract: The present application relates to an LED bracket, a light-emitting unit and a light-emitting assembly. A substrate of the LED bracket comprises a substrate main body, and a supporting part extending from the substrate main body into a side wall of a bowl portion of the LED bracket, wherein the supporting part extends from one conductive area to the other conductive area in the side wall of the bowl portion of the LED bracket, and at least extends to a side wall area corresponding to an insulating area on the side wall that insulates and isolates the two conductive areas.

Abstract: A comprehensive system for potential risk identification and pollution prewarning of groundwater comprises a cable laying device, a monitoring cable, and an electromagnetic retrieving device which are located in groundwater between two adjacent wells, wherein the two adjacent wells comprise a first well and a second well, the second well is located at a lower water level of the first well and communicates with the first well, the electromagnetic retrieving device is located in the second well, a plurality of sensors are arranged on the monitoring cable, and one end of the monitoring cable is connected to the cable laying device. The cable laying device comprises a device body, an anchoring module arranged at a bottom of the device body, and an electromagnetic adsorption module arranged on the device body. The monitoring cable is connected to the cable laying device after passing through the anchoring module.

Abstract: An abrasive block mounting and dismounting assembly, a mounting and dismounting method, a wheel tread cleaning device, and a railway vehicle.

Abstract: A comprehensive system for potential risk identification and pollution prewarning of groundwater comprises a cable laying device, a monitoring cable, and an electromagnetic retrieving device which are located in groundwater between two adjacent wells, wherein the two adjacent wells comprise a first well and a second well, the second well is located at a lower water level of the first well and communicates with the first well, the electromagnetic retrieving device is located in the second well, a plurality of sensors are arranged on the monitoring cable, and one end of the monitoring cable is connected to the cable laying device. The cable laying device comprises a device body, an anchoring module arranged at a bottom of the device body, and an electromagnetic adsorption module arranged on the device body. The monitoring cable is connected to the cable laying device after passing through the anchoring module.

Abstract: The disclosure relates to the technical field of vehicles, and particularly provides a multi-link independent suspension for a vehicle that includes a subframe and a steering knuckle. In order to solve the problem of reduced adjustment efficiency caused by mutual restraining of linkages of an existing multi-link independent suspension when a camber angle is adjusted, the multi-link independent suspension includes a spring control arm that is configured to adjust a camber angle of a wheel center. The multi-link independent suspension also includes a front upper control arm and a rear upper control arm.

Abstract: The present application discloses a cooking device, which includes a cabinet; the cabinet includes an inner cavity, a first heating assembly and a second heating assembly; the inner cavity is provided with a cooking chamber, as well as a first side wall and a second side wall that are arranged opposite to each other, the first side wall is provided with a first ventilation structure, and the second side wall is provided with a second ventilation structure; the first heating assembly is arranged outside the inner cavity and arranged corresponding to the first ventilation structure, and is configured to circularly heat air in the cooking chamber; the second heating assembly is arranged outside the inner cavity and arranged corresponding to the second ventilation structure, and is configured to circularly heat the air in the cooking chamber.