209results about How to "Taking into account stability" patented technology

The invention provides an active inertia supporting method, device and equipment for an energy-storage-free photovoltaic grid-connected system, and relates to the technical field of new energy grid-connected power generation and intelligent control. The method comprises the following steps: constructing a direct current-alternating current double-side dynamic model of the energy-storage-free photovoltaic grid-connected system; constructing a total objective function according to the direct current-alternating current double-side dynamic model; the total objective function comprises a plurality of objective functions and penalty functions; taking the power reservation coefficient and the virtual rotational inertia as individuals, and taking a plurality of target functions as a multi-target task cooperation whale optimization algorithm to obtain a Pareto front; respectively inputting individuals in the Pareto frontier into the total objective function to determine an optimal individual; and dynamically introducing the optimal individual into a control module of the grid-forming type virtual synchronous generator through a smooth transition function, so that the energy-storage-free photovoltaic grid-connected system operates in an optimal state. According to the invention, voltage and frequency fluctuation can be effectively suppressed, system stability and photovoltaic utilization rate are both considered, and operation cost is reduced.

The invention belongs to the technical field of plant planting, and discloses a plant root zone water-retaining agent targeted application method and system based on an intelligent model, and the method comprises the steps: obtaining plant parameter data, planting pit structure data and soil texture data; determining a root zone radius and a root zone effective depth, calculating a root zone cross section area and a root zone volume, and obtaining the number of layers and the volume of each layer; obtaining a water supply event record and a water content time sequence, obtaining a root zone equivalent infiltration volume, and obtaining a root zone effective water retention volume; calculating the notch volume of the effective moisture supply of the root zone by combining the effective moisture retention volume of the root zone, and endowing the notch with a grade mark; pre-constructing a water-retaining agent application prediction model, and outputting a water-retaining agent target dosage and layered putting proportion set; correcting an output result of the water-retaining agent application prediction model; modeling analysis is carried out on the moisture retention and notch of the root zone through the model, the water-retaining agent dosage and the layering proportion are output, and the pertinence and stability of water-retaining agent application are improved.

The application discloses a laser engraving processing device and method based on a five-axis engraving machine, relates to the field of laser engraving equipment control, and loads a three-dimensional CAD model and a process task of a workpiece to be processed, distributes the process task to machining paths of each laser processing assembly, respectively predicts time-space collision of paths of five laser processing assemblies, adjusts speed or paths of low-priority laser processing assemblies through a priority avoidance algorithm when collision risk is predicted, and generates a collision-free pre-planned path. Through reasonable path planning and a collision avoidance mechanism, the application effectively avoids collision risk between multiple laser processing assemblies and guarantees stability of a machining process. Through establishment of a thermal influence monitoring grid and a thermal dose accumulation model, laser machining parameters are adjusted in real time, workpiece deformation caused by thermal dose superposition is avoided, and machining quality is improved. A focal point dynamic following mechanism ensures that the focal point is always in an optimal machining position, and further improves engraving precision.

The application discloses a kind of low-voltage electrical apparatus contact working condition intelligent adjustment systems, it is related to low-voltage electrical apparatus technical field. Including: data acquisition module, for collecting the basic working condition original data set and coupling working condition original data set of low-voltage electrical apparatus contact, and pre-processing, obtain corresponding standardization basic working condition data set and standardization coupling working condition data set;Data analysis module is used for the comprehensive analysis of multidimensional working condition correlation data in standardization coupling working condition data set, and obtains working condition compensation adjustment value.The final working condition adjustment value obtained by the application can offset the working condition fluctuation caused by temperature rise deformation, electric force interference and spring aging attenuation during contact operation, maintain the stable contact state of contact rated design, reduce the occurrence probability of abnormal temperature rise of contact resistance, prolong the service life of contact, and through hierarchical control logic, the stability of continuous operation of equipment and the reliability of fault protection are considered.

The invention relates to the technical field of facility agriculture and micro-grid cooperative control, and particularly discloses a greenhouse micro-grid dynamic scheduling and photosynthetic efficiency cooperative optimization control method and system. The method comprises the following steps: constructing an energy management scheduling model with maximization of accumulated net photosynthetic products of crops in a scheduling period and minimization of net energy cost of a micro-grid as a collaborative optimization target; collecting real-time environment parameter data in the greenhouse and operation data of a micro-grid wind and light storage system and a load; a multi-objective optimization algorithm is adopted to solve the model online, and a joint optimization strategy including a micro-grid dynamic scheduling instruction and a greenhouse environment coordination control instruction is output; and executing the joint optimization strategy, and dynamically regulating and controlling the power output distribution of the micro-grid, the energy storage charging and discharging state and the operation process of the environment regulation and control equipment. According to the method, the multi-target collaborative optimization model with'photosynthetic product accumulation maximization 'and'net energy cost minimization' as the core is constructed, so that comprehensive maximization of energy benefits and agricultural production benefits is realized.

This invention provides a clock discipline method and apparatus, relating to the field of time synchronization technology. The method first calculates the original time difference sequence, then filters it, then calculates the frequency increment based on the filtered time difference sequence, and finally performs calibration based on the frequency increment. This ensures that the frequency deviation information on which calibration depends is no longer affected by the random jitter of the BeiDou clock second pulse signal, thereby suppressing frequent oscillations in the calibration command. At the same time, because the time difference sequence on which calibration is based has become smooth and stable, the calibration process converges faster, avoiding phase disturbances introduced by repeated trial and error. Thus, without sacrificing the inherent short-term stability of the local crystal oscillator, it achieves continuous and stable correction of its long-term frequency drift, taking into account both the short-term stability and long-term frequency accuracy of the output clock.

The utility model requests protect a kind of swimming pool lifting type advertising screen, its technical scheme main point is including box, box is movably connected with back frame, the front surface of back frame is connected with display screen, and multiple section type support pipe is vertically set in box, back frame is connected on support pipe, installation slot is set in the edge of swimming pool, box is installed in installation slot, gear and rack that is mutually engaged are equipped between back frame and box, rack is set along the extension direction of support pipe, gear is fixedly connected in the output end of motor, the utility model realizes the lifting of advertising screen by the cooperation of gear and rack, maintains the stability of lifting by support pipe, setting in installation slot in the edge of swimming pool is convenient for swimmer to see when resting, and stability and aesthetic property are considered.

The utility model discloses an electric energy metering box quick release type cable fixing clamp plate, comprising a fixed bottom plate, the fixed bottom plate is slidably connected with a movable plate, the movable plate and a butt joint plate are in butt joint to form a mounting hole, the fixed bottom plate is provided with a butt joint unit, the movable plate is provided with a plectrum, the plectrum is provided with an embedding unit, and the embedding unit is provided with a clamping groove. The butt-joint unit and the embedding unit can be connected in a clamping mode, a push block is connected to the fixed bottom plate in a sliding mode, a bevel groove is formed in the shifting piece, when the push block slides, the push block can abut against and extrude the bevel groove to drive the shifting piece to be away from the butt-joint unit, and the butt-joint unit is separated from the embedding unit. According to the technical scheme of the utility model, on the basis of ensuring the stable connection, the connection state between the butt joint unit and the embedding unit can be changed through the push block, so that the disassembly and the assembly can be independently realized through different parts, and the connection stability and the disassembly convenience can be considered at the same time.

The utility model provides a kind of etching liquid's acid-base waste gas spray tower, including tower body, water outlet pipe being passed in tower body, the top of tower body is equipped with exhaust port, tower body is sequentially provided with the aeration device for being used to pass into waste gas and carry out aeration, the purification device for purifying waste gas and the spray device for spraying from below to top in it, the bottom of tower body is formed with water storage pool, and aeration device is located in water storage pool;Purification device includes the partition plate being arranged in tower body, the purification piece being arranged on partition plate, partition plate is equipped with mounting groove, the bottom of mounting groove is equipped with through hole, and through hole is through in partition plate and is communicated with mounting groove;Purification piece includes the mesh enclosure being arranged in mounting groove, the adsorption ball being arranged in mesh enclosure and the cover plate being arranged on mesh enclosure, and adsorption ball is filled in mesh enclosure, cover plate is arranged on the top of mesh enclosure, and micro gap is formed between cover plate and partition plate.The utility model has the advantages of low energy consumption and high purification performance.

A kind of flow video active interaction control method, equipment and medium for the scene of helping blind, construct the hierarchical task system for the scene of helping blind, train the semantic understanding and behavior alignment of multimodal large model to specific task of helping blind;Introduce the active interaction control mechanism for flow video, under the premise of not changing the bottom model parameter, realize the trigger output of environmental perception by the dynamic suffix switching of determination mode and generation mode;Finally, the incremental context updating strategy is used to optimize the inference process, while keeping the timing consistency and reducing the calculation redundancy.The invention solves the technical problems of lack of special data, passive interaction logic and calculation redundancy of multimodal large model in flow environment through the synergistic effect of data-driven task adaptation and active interaction mechanism.The general framework proposed in the invention provides an important theoretical basis and technical paradigm for the paradigm evolution of flow video understanding from "passive analysis" to "active interaction".

The application provides a surveying and mapping instrument positioning device for engineering surveying and mapping, and relates to the technical field of engineering surveying and mapping equipment, which comprises a support seat and further comprises an expansion adjusting assembly, wherein the expansion adjusting assembly comprises a first driving motor mounted at the bottom of the support seat, in the application, the gear engages to drive two centrally symmetrical racks to move reversely, the moving seat is synchronously moved with the racks through sliding cooperation with the linear guide rails, flexible adjustment of the distance between the support rods is realized, the rotating seat can rotate around the support frame, the angle is adjusted through the arc-shaped guide rails, and the positioning is completed by tightening the first knob bolt after the rotating seat is in place, in the multistage telescopic assembly, the support rods, telescopic rods and fine adjustment rods can slide along the length direction, are stretched to a suitable height as required, and are locked and fixed through corresponding knob bolts, the support rods on the support seat and the rotating seat are matched, telescopic adjustment and angle adjustment are combined, quick and flexible adjustment of the support span, the angle and the height is realized, and stable placement of the surveying and mapping instrument under various terrains is ensured.

The invention belongs to the technical field of compaction method foundation treatment, and particularly relates to a compaction method foundation treatment inter-pile soil sampling device which comprises a cylinder, a conical cylinder, a positioning cylinder, a sampling cylinder and a cutter, a plurality of guide holes are evenly distributed in the circumference of the cylinder, and the positioning cylinder is slidably arranged in the guide holes; a sampling barrel is arranged on the inner wall of the positioning barrel in a sliding manner; a plurality of guide blocks are evenly distributed on the circumference of the conical cylinder, sliding grooves are formed in the guide blocks, and the cutters are arranged in the sliding grooves in a sliding mode. The bottom sides of the cutters are in one-to-one correspondence with the sampling barrels; a plurality of positioning barrels extend out of the cylinder and abut against the inner wall of the exploratory well, a tip slope is arranged at one end of the sampling barrel, and after the sampling barrel is inserted into the inner wall of the exploratory well, the cutter is obliquely and downwards inserted into the soil body and coincides with the tip slope, so that a soil sample in the sampling barrel is cut off from the rear soil body. According to the device, the sampling device can be positioned and fixed, sampling and sample breaking can be rapidly carried out, samples can be conveniently taken out, and the sampling efficiency in an exploratory well is greatly improved.

This invention provides a hydrophobic solvent and coating, comprising the following components by weight: perfluoronaphthalene: 93-94.5 wt%; methyl undecanoate: 5-5.3 wt%; perfluoropolyether trimethoxysilane: 0.2-0.8 wt%. This invention constructs a low surface energy layer on the substrate surface using perfluoropolyether trimethoxysilane, weakening the adhesion between water and the coating. During windshield wipes, no white fog is visible, solving the problem of residual white fog after wiping with traditional coatings. Simultaneously, the film-forming substance forms chemical bonds with the hydroxyl groups of the substrate, resulting in high adhesion and coating hardness, stable basic hydrophobicity and mechanical properties, meeting the needs of conventional applications.

The utility model discloses a combined type anti-explosion electric immersed pump, which belongs to the technical field of electric immersed pumps and comprises a pump cavity, a liquid conveying pipe is connected onto the pump cavity, a plurality of pump bodies are arranged in the pump cavity, liquid pumping pipes are arranged on the pump bodies, and the liquid pumping pipes are communicated with the liquid conveying pipe, so that liquid pumped by the pump bodies converges and enters the liquid conveying pipe. And the liquid is conveyed to the next link through the liquid conveying pipe. The utility model effectively solves the problems of low speed and low efficiency of the traditional liquid transmission system, and not only improves the transmission speed and efficiency of the ultra-large flow flammable and explosive liquid, but also gives consideration to the stability and safety of the system through the parallel system of the combined explosion-proof submersible pump.

The invention belongs to the technical field of battery manufacturing, and relates to a lithium-supplementing current collector and a preparation method and application thereof.The lithium-supplementing current collector comprises a base film, a first metal layer and a second metal layer, the first metal layer and the second metal layer are arranged on the surface of at least one side of the base film in a stacked mode, and the first metal layer is located between the base film and the second metal layer; and the second metal layer is a lithium-containing alloy layer. The preparation method comprises the following steps: (1) arranging a first metal layer on the surface of at least one side of a base film; and (2) depositing a lithium-containing alloy layer on the surface of the first metal layer as a second metal layer to obtain the lithium-supplementing current collector. The lithium-containing alloy layer is prepared in the current collector, so that accurate lithium supplementation of the negative electrode is realized, safety, economy and stability are considered, and large-scale mass production is facilitated.

The application discloses a rice straw-based liquid mulch emulsion and a preparation method and application thereof. The preparation method comprises the following steps: adding pretreated rice straw into a sodium hydroxide solution for alkali treatment, so as to obtain rice straw fibers and a silicon-containing black liquor; washing and bleaching the rice straw fibers, so as to obtain bleached rice straw fibers; first standing the silicon-containing black liquor, then adjusting the pH value, and continuing to stand, so as to obtain a silicon-containing dispersion liquid; mixing the bleached rice straw fibers with an alkaline alcohol solution and activating, then adding chloroacetic acid for etherification reaction, so as to obtain carboxymethyl cellulose; mixing a polyvinyl alcohol solution and the carboxymethyl cellulose solution, and adding the silicon-containing dispersion liquid under stirring, and then supplementing water, so as to obtain the rice straw-based liquid mulch emulsion. The rice straw-based liquid mulch emulsion prepared by the application can be applied to the covering of cultivation soil, has the advantages of excellent film forming strength, toughness, light shielding and soil covering adaptability, and the like, and has the advantages of wide raw material sources, simple preparation process and suitability for large-scale popularization.

The present application relates to a kind of grape seed fermentation raw pulp skin care product and its preparation method and application.The preparation method includes that grape seed powder is mixed with water after cellulase and pectinase enzymolysis, then access lactic acid bacteria fermentation;When the fermentation liquor reaches specific pH and free lactic acid content, first add alginic acid oligosaccharide and sodium phytate, stir then add gluconolactone and low-substitution hydroxypropyl cellulose, continue fermentation, sterilization and filtration, obtain grape seed fermentation raw pulp;Then the raw pulp is mixed with humectant, thickening agent, preservative aid and water, and skin care product is prepared.The present application is controlled by two-stage during fermentation ripening stage, so that oligomeric procyanidins, organic acid salt and ripening control component form relatively stable dispersion state, reduce the risk of fine sedimentation, kneading mud and uneven coating film rubbing when applying after hard water cleaning.

The invention provides a positive electrode active material and a preparation method thereof, a positive electrode plate, a battery and electric equipment, the positive electrode active material comprises LiNi [alpha] Co [beta] Mn [gamma] Sb [delta] R [epsilon] O2, R comprises one or more of Mg, Al, Sr, Y, Zr, Sn, W, Ta and Nb, and [alpha] lt is greater than or equal to 0.95; 1.0, 0 lt; beta is less than or equal to 0.03, 0lt; gamma < = 0.03, 0.001 < = delta < = 0.008, 0.001 < = epsilon < = 0.003, and 0.995 < = alpha + beta + gamma + delta + epsilon < = 1.005; and the cell parameters a of the positive electrode active material are equal to 2.874 to 2.878, and the cell parameters c of the positive electrode active material are equal to 14.200 to 14.205. The positive electrode active material provided by the invention can give consideration to both high capacity and long-term cycle stability.

The utility model provides a kind of folding multifunctional travel draw-bar box, it is related to draw-bar box technical field, including box, the bottom of box is provided with gyro wheel A, the top of box is provided with draw-bar body, the right side fixed mounting of box is provided with lock block, the left side fixed mounting of box is provided with support block, the surface of box is provided with lid, the bottom of lid is provided with gyro wheel B, the right side of lid is provided with lock cover, the inside of lid is provided with extension plate, improve practicality and user experience, the synergistic effect of extension plate, adjusting groove, limit block and sliding groove, give box space height adjustability, adapt the classification storage needs of different size articles, the combination design of threaded rod and steering handle further simplifies the operation process of article fixation, avoid displacement or damage due to vibration in the process of transportation, overall structure gives consideration to flexibility and stability, meet the efficient storage and convenient carrying needs under multiple scenes.

The utility model relates to the technical field of indwelling needle fixation, specifically is a kind of indwelling needle fixing bandage.The utility model discloses indwelling needle fixing bandage including finger sleeve, it is equipped with the first extension section extending to the dorsal direction of the patient's limbs on finger sleeve, and the second extension section extending to the palm direction of the patient's limbs, since the first extension section and / or second extension section are greater than preset length, can be wound around the patient's limbs at least one week when the first extension section is connected with the second extension section.The technical scheme will finger sleeve be worn on the thumb of the patient's limbs, and be fixed by the first extension section and the second extension section around the limbs, the indwelling needle on the dorsal of the limbs is fixed, and the indwelling needle on the limbs of different sizes can be fixed;And since the first extension section and the second extension section are opposite in tension direction when fixing indwelling needle, finger sleeve will not be tight due to one-way pulling thumb, and then the stability and comfort of indwelling needle fixation are considered.

The invention relates to the technical field of high-activity metal powder, in particular to high-environmental-stability aluminum-lithium alloy powder and a manufacturing method and application thereof.The high-environmental-stability aluminum-lithium alloy powder comprises, by weight, 1.0-10.0 wt.% of Li, 1.0-10.0 wt.% of Al, 1.0-10.0 wt.% of Ti, 1.0-10.0 wt.% of Ti, 1.0-10.0 wt.% of Ti, 1.0- 0.1 to 5.0 wt.% of Zr; 0.01 to 2.0 wt.% of Ti; 0.05 to 3.0 wt.% of RE; wherein RE is a rare earth element and at least comprises Y, Ce, La or a combination thereof, the sum of Zr, Ti and RE does not exceed 8.0 wt.%, and the balance is Al and inevitable impurities. The method has the effect of improving the use stability and the machining consistency of the aluminum-lithium alloy powder.

The application discloses an elastic sealing material for inner liner of a puncture-proof tire and a preparation method thereof, and relates to the technical field of tire sealing materials.The application comprises the following steps: uniformly mixing microgel, brominated butyl rubber 96.5%-98.8%, dicumyl peroxide 0.6%-1.0% as a pre-crosslinking agent, zinc oxide 0.4%-1.2% and stearic acid 0.2%-0.8% according to the mass percentage, and performing pre-crosslinking treatment; and cooling, crushing and grading the particle size of the pre-crosslinked material to obtain crosslinked brominated butyl rubber microgel with a D50 particle size of 1.0-4.0 microns; the gel content of the crosslinked brominated butyl rubber microgel is 75%-90%, and the swelling ratio is 1.8-3.2.The application disperses the crosslinked brominated butyl rubber microgel in a continuous halogenated butyl airtight phase and forms an ion crosslinking structure by preparing crosslinked brominated butyl rubber microgel, interfacial pre-dispersed material and ion crosslinking vulcanized rubber material.The method makes the elastic sealing material have the inner liner body elastic retraction and hole closing ability, and reduces the dependence on a high viscous flow type self-sealing rubber layer.

The utility model provides a vehicle-mounted charger with a replaceable billboard, and belongs to the technical field of vehicle-mounted charging equipment. The vehicle-mounted charger comprises a power taking module; one end of the spring wire is connected with the output end of the power taking module; a vehicle-mounted support; the input end of the charging module is connected with the other end of the spring wire, and the charging module is mounted on the vehicle-mounted bracket; one end of the charging wire is provided with a first charging interface and a second charging interface, and the other end of the charging wire is connected with the output end of the charging module; the charging module comprises a lower shell, an upper shell, a charging mainboard, a loudspeaker, a human body sensor, a switch button, a two-dimensional code support, a two-dimensional code board and an advertising board. The vehicle-mounted charger has the advantage that the functionality of the vehicle-mounted charger is greatly improved.

The invention discloses an energy storage grid-connected and off-grid switching system and a control method thereof. The invention belongs to an energy storage system control system and method, and provides an energy storage grid-connected and off-grid switching system and a control method thereof for solving the problem that when a power grid in an energy storage system breaks down and is recovered, an existing grid-connected and off-grid switching method is likely to fail in switching. According to the first type, one battery pack, one power conversion system and one static change-over switch are sequentially connected to form an energy storage cabinet, and all the energy storage cabinets are connected in parallel and then connected to a power grid and a local load. According to the other mode, a plurality of static change-over switches are connected in parallel to form a static change-over switch cabinet, a plurality of power conversion systems are connected in parallel to form a power conversion system cabinet, and the static change-over switch cabinet is connected with the power conversion system cabinet and then is connected with a power grid and a load, so that flexible wiring can be realized, and a modularized structure is arranged, so that adjustment and capacity expansion can be conveniently carried out at any time; and the stability of grid-connected and off-grid switching can also be considered.

The invention discloses a lithium battery with a protection function and a processing technology. The lithium battery comprises a lithium battery body, the protection device comprises a base, protection plates symmetrically arranged at the top of the base, side plates, a top plate detachably connected with the protection plates and the side plates, a third rubber pad arranged at the top of the top plate, first rubber pads arranged on the protection plates, and second rubber pads arranged on the side surfaces of the side plates; the invention has the beneficial effects that the base, the protection plate, the side plates and the top plate form a six-direction rigid protection space, and the L-shaped reinforcing columns are matched to enhance the structural rigidity; the rubber pad and the ultra-thin ceramic fiber buffer film form an elastic buffer system, so that external force such as collision and extrusion is effectively resisted, and damage to the shell and damage to internal components are avoided; through precise positioning between limiting blocks and limiting grooves and between inserting plates and inserting grooves, a threaded rod is used for reinforcing and eliminating gaps, and the battery is prevented from shaking; the threaded connection design facilitates maintenance and replacement, and stability and practicability are both considered.

A walking device for power conductor rotating operation equipment and a control method thereof. The walking device comprises a semicircular plate, lifting mechanisms arranged on both sides of the semicircular plate, telescopic mechanisms, horizontal moving gantry mechanisms connected to the telescopic mechanisms, and driving clamping mechanisms connected to the horizontal moving gantry mechanisms. The control method adopts the walking device, detects obstacles in front in real time by using a detection unit, automatically adjusts the pitch angle by using the rotary connection between the telescopic mechanisms and the semicircular plate, plans a composite obstacle avoidance track by the lateral displacement of the telescopic mechanisms cooperating with the gantry mechanisms according to the shape of the obstacles, and realizes power failure protection by using the mechanical self-locking characteristics of the forward and reverse rotating ball screws and the roller envelope structure. The present application can realize stable obstacle crossing and flexible posture adjustment of the power conductor rotating operation equipment under heavy load conditions, avoid mechanism jamming or wire damage caused by rigid confrontation, and reduce the risk of equipment falling caused by power failure during operation.

The invention relates to a dynamic environment autonomous navigation method and system based on sub-target generation hierarchical reinforcement learning. The method comprises the following steps: constructing a double-layer framework in which a top layer is responsible for target scheduling and a bottom layer is responsible for high-frequency execution; the top layer constructs a local occupation grid map according to the laser radar, constructs strip-shaped sub-target probability distribution based on a global reference path, and regulates and controls the entropy of the strip-shaped sub-target probability distribution and the commitment time limit between the top layer and the bottom layer through the environment self-adaptive exploration temperature; and the bottom layer follows the current sub-target within the committed time limit, so that the robot drives to the real-time sub-target. According to the method, strip-shaped probability sub-target distribution is constructed around a global reference path, the distribution entropy and the underlying committed time limit are regulated and controlled by utilizing environment feature-driven exploration temperature single knob linkage, and sub-target screening and issuing are completed in combination with safety expansion and reachability constraint; and a bottom-layer high-frequency closed-loop actuator follows within a commitment period and triggers advanced re-mining when the risk is increased, so that safe and smooth real-time arrival of a final target is realized.

The pneumatic locker comprises a shell assembly, a fixing shaft, an inner sliding sleeve, a piston assembly and a plurality of balls, and the fixing shaft is arranged in a containing cavity of the shell assembly and extends in the extending direction of the containing cavity; the outer peripheral surface of the inner sliding sleeve is provided with an outer conical surface of which the diameter is gradually increased along the extension direction of the fixed shaft; the inner sliding sleeve is movably sleeved with the piston assembly, the piston assembly divides the containing cavity into a pressure boosting space and a pressure bearing space which are not communicated with each other, and the inner side face of the piston assembly is provided with an inner conical face matched with the outer conical face; the plurality of balls are arranged between the outer conical surface and the inner conical surface; when gas is input into the pressure boosting space, the gas in the pressure boosting space pushes the piston assembly to move towards the pressure bearing space so that the balls can move towards the pressure bearing space, meanwhile, the distance between the outer conical surface and the inner conical surface is reduced, and therefore locking fit is formed between the piston assembly and the fixing shaft. According to the technical scheme, the consistency of each locking state can be greatly improved.

The utility model discloses an electronic workshop material conveying device which takes a conveying robot as a core, a placing table is arranged at the top and used for bearing materials, transverse and longitudinal moving wheels are arranged at the bottom, and the sliding connection design of a bottom rail groove and an embedded ball is combined, so that the moving flexibility and the positioning accuracy in a workshop are greatly improved; the positioning stand columns and the movable stand columns are arranged on the outer side of the containing table, the elastic pressing belts are connected through the lifting screw rods and the lifting sleeves, materials of different sizes can be effectively fixed, the material containing stability is further enhanced through the design of anti-skid lines, telescopic springs and baffle rings on the top of the containing table, and the materials are prevented from sliding off; by means of the device, the problems of an existing material conveying device in the aspects of moving flexibility, material fixing and maintaining convenience are effectively solved, and the overall efficiency and reliability of material conveying of the electronic workshop are improved.

The application relates to the technical field of gas concentration detection, in particular to a gas concentration detection method and system for a ring main unit; the method comprises the following steps: acquiring a concentration time sequence of a gas sensor in the ring main unit; constructing an instantaneous fluctuation coefficient; analyzing the instantaneous fluctuation coefficient and a gas physical diffusion limit rate constant to acquire an environmental interference factor representing the intensity of electromagnetic interference; acquiring an environmental interference curve, combining the environmental interference factor and an integral operation value of the environmental interference curve to acquire a dynamic adjustment parameter; obtaining a dynamic noise covariance for Kalman filtering; performing Kalman filtering processing on the concentration time sequence by using the dynamic noise covariance to obtain an optimal estimated gas concentration value. The problems of false alarms and missed detection in the gas concentration detection process are solved.