64results about How to "Adjust the quantity flexibly" patented technology

The invention discloses a floating island type water ecological restoration treatment device adopting a bio-membrane. The device comprises an active carrier bio-membrane reactor, an aeration system and a floating island platform, wherein the active carrier bio-membrane reactor is arranged on the floating island platform, the aeration system comprises a spraying device and a uniform water spraying and distributing bin, and the spraying device and the uniform water spraying and distributing bin are located above the active carrier bio-membrane reactor; the active carrier bio-membrane reactor is filled with biocarrier filling, and a microbial flora is biofilm cured on the biocarrier filling. The invention further discloses an application of the floating island type bio-membrane water ecological restoration treatment device. The device is a long-term water purification device, a bio-membrane technology is adopted, and the concentration of ammonia nitrogen and COD (chemical oxygen demand) pollutants in water can be effectively reduced; meanwhile, by continuous enrichment of the microbial flora in the device, the device has a certain effect on reduction of BOD (biochemical oxygen demand), phosphorus and other pollutants.

The invention provides an intelligent electric meter detecting device. the intelligent electric meter detecting device comprises a shell, wherein an upper surface of the shell is an inclined surface; a groove is formed in the upper surface of the shell; a placing box is arranged in the groove; a latch device is arranged above the placing box and comprises a fixing plate, a lug and a fixing rod; the lug and the fixing plate are fixed on the upper surface of the shell; the lug is positioned above the fixing plate; the fixing rod is in clamped connection to the upper surface of the fixing plate through a chute; the lower end of the fixing rod is fixedly connected to the placing box; the upper end of the fixing rod is fixedly connected with a pulling ring; a connecting device is arranged below the placing box and comprises a base, a positioning rod and a pin; the base is fixed on the upper surface of the shell; a display screen and a change-over switch are arranged at the front end of the shell; and a withstand voltage detecting circuit and an electrification detecting circuit are arranged in the shell. The intelligent electric meter detecting device is simple in structure and convenient to use; electrification detection and withstand voltage detection of an intelligent electric meter can be quickly realized; the time and the labor are saved; and the work efficiency is greatly improved.

The invention provides digital printing transparent tipping paper and a making method, and belongs to the technical field of printing. The tipping paper comprises a transparent tipping paper raw paper layer, an underpainting layer, a coating layer, a digital ink layer and a gold stamping substance layer. The making method of the tipping paper comprises a step before printing, wherein transparent tipping paper sample manuscript designing and transparent tipping paper raw paper pretreating are conducted; a printing step, wherein a designed transparent tipping paper sample manuscript is input into digital printing equipment, and printing is conducted on transparent tipping paper raw paper; a step after printing, wherein gold stamping, die cutting and winding treating are conducted on a semi-finished transparent tipping paper product. According to the digital printing method of the transparent tipping paper, a printing plate does not need to be manufactured, therefore, the cost of materials and dies is reduced, and environmental pollution brought by an electroplating technology in the plate manufacturing process is eliminated; the transparent tipping paper is printed by adopting digital printing, the printed ink layer is thin and uniform in distribution, relatively less ink is consumed, patterns and characters are fine and exquisite, and the advantages of being bright in appearance and high in glossiness and smoothness of the transparent tipping paper are reasonably utilized.

The invention discloses a dry-jet wet-spinning jetting device and a making method thereof. The dry-jet wet-spinning jetting device comprises a flow regulating cover and a jetting plate which is installed inside the flow regulating cover, the upper end of the flow regulating cover is provided with multiple air inlets which are symmetrically distributed relative to the symmetry axis of the jetting plate, and the air inlets are connected with an air-supply device; the lower portion of the flow regulating cover is immersed into a coagulating bath to be sealed, and multiple air outlets are formed in the positions, located above the liquid level and close to the liquid level, of the flow regulating cover. By means of the immersed type flow regulating cover, it is guaranteed that on the condition that the jetting plate and jetting liquid flow are both in a stable atmosphere, the upwards oblique air outlets formed in a lower flow regulating cover body can prevent the liquid level from fluctuating, and meanwhile the air sealing effect of near liquid level is achieved. The angle of inclination of a shell of an upper flow regulating cover body is the same as that of a shell of a conical jetting cap, diffusion of air flow is achieved through parallel inclined planes, and the effect of uniform and gentle circulation can be achieved.

The invention discloses a common-bus multifunctional mobile energy storage vehicle and a control strategy, and belongs to the power supply equipment field. The common-bus multifunctional mobile energystorage vehicle comprises a vehicle body and an energy storage assembly. The energy storage assembly is arranged on the vehicle body. The energy storage assembly comprises a battery assembly, a confluence cabinet, an energy storage converter, a power distribution cabinet, a vehicle-mounted charging pile, a control system and an auxiliary power system. The battery assembly is electrically connected with the confluence cabinet; the confluence cabinet is electrically connected with the energy storage converter; and the energy storage converter is electrically connected with the power distribution cabinet, the power distribution cabinet is electrically connected with a plurality of vehicle-mounted charging piles, the auxiliary power system is electrically connected with the power distributioncabinet, the control system is connected with the battery assembly, the confluence cabinet, the energy storage converter, the power distribution cabinet, the vehicle-mounted charging piles and the auxiliary power system, and the battery assembly is formed by connecting multiple clusters of battery packs in parallel. According to the common-bus multifunctional mobile energy storage vehicle and thecontrol strategy, the multiple clusters of battery packs are arranged in parallel in a common-bus mode, a charging amount is large, and the vehicle is suitable for more application scenes.

The invention discloses a full-automatic keyboard assembly line, which comprises a first conveying line for conveying a keyboard substrate and a key cap jig, a keyboard substrate loading station located at the head end of the first conveying line, a conventional key assembly apparatus located at the end of the first conveyor line, a plurality of balance bars and a special key cap integrally arranged between the keyboard substrate loading station and the common key assembly apparatus, a substrate tooling moving on the first conveying line, a second conveying line for recovering the tooling located below the first conveying line, and a jacking mechanism communicating the first conveying line and the second conveying line at both ends of the first conveying line. The invention cleverly integrates the mounting of the balance bar and the mounting of the key cap with special function in one working station, and integrates the assembly of the common key cap in one device, thereby greatly improving the production efficiency, reducing the whole volume of the assembly line and greatly reducing the production cost. The invention also discloses a method for mounting the balance bar and the keycap with special function in one working station.

The invention relates to an enhanced external pressing hollow fibrous membrane assembly easy to assemble and capable of being integrated. The enhanced external pressing hollow fibrous membrane assembly is characterized by comprising at least one membrane assembly and two water collecting devices; the membrane assembly is formed by a plurality of hollow fibrous membranes and two membrane sealing containers; the water collecting device is a columnar casing which has a columnar hollow cavity, the columnar hollow cavity forms a water passage, a first pipe joint is arranged at the top of the casing, a second pipe joint matched with the first pipe joint is arranged at the bottom of the casing, and a membrane assembly insertion hole is arranged in the side wall of the casing; in an assembly state, the two water collecting devices and the membrane assembly insertion hole are arranged face to face, the two membrane sealing containers in each membrane assembly are correspondingly inserted into the membrane assembly insertion holes of the two water collecting devices, and hollow pipe cavities of hollow fibrous membranes in the membrane assembly are communicated with the columnar hollow cavities of the water collecting devices. According to the invention, the number of needed membrane assemblies can be flexibly adjusted according to water quality and water volume, and membrane filaments are not easy to damage in assembly, thereby being firm and durable.

The invention provides a method for manufacturing river channel dry land construction conditions by using a flow self-adjusting siphoning type construction flow guide pipe, which comprises the following steps of: marking a river channel area of the river channel dry land construction conditions to be manufactured as a construction drying area which is positioned at the downstream of a water retaining building of a river channel; determining a water return area at the downstream of the construction drying area, wherein the water return area is adjacent to the construction drying area; installing a siphoning type construction flow guide pipe used for conveying water on the upstream of the water retaining building to the downstream of the water return area at the water retaining building; andcreating a vacuum condition for the siphoning type construction flow guide pipe so that water in front of the water retaining building can be conveyed to the downstream of the water return area through the siphoning type construction flow guide pipe, and when water in the target area flows out of the target area, forming a riverway dry land construction condition in the construction drying area.The method can significantly reduce the engineering investment, simplify the manufacturing operation of river dry land construction conditions, avoid the hidden danger of flood discharge, and also has the characteristic of being more environmentally friendly.

The invention discloses a porous medium reaction heat effect monitoring device and method, comprising a transparent quartz reactor, a ceramic heater, a heating controller, differential thermocouples,an analog-digital converter, a photoconductive fiber heat sensor, a computer and an injection system; an injection end cover and an outlet end cover are arranged at the left end and the right end of the transparent quartz reactor respectively, the injection system is connected with the injection end cover, the transparent quartz reactor is placed in a heating cavity of the ceramic heater, the ceramic heater is connected with the heating controller, quantity of the differential thermocouples is two, measuring terminals of the two differential thermocouples respectively pass through the injection end cover and the outlet end cover and then are placed inside the transparent quartz reactor, a cold side of each differential thermocouple is connected with the analog-digital converter, and the output terminal of the analog-digital converter is connected with the computer. The porous medium reaction heat effect monitoring device disclosed by the invention can monitor porous medium reaction heat effect under dynamic airflow condition and can be used for accurately evaluating catalytic effect of a catalyst on reaction and monitoring movement of a burning front.

The invention discloses a multi-module automatic dismounting and mounting lifting mechanism and a lifting method. The mechanism comprises an automatic transverse moving mechanism, an automatic liftingmechanism and multiple modules; the automatic transverse moving mechanism comprises an automatic horizontal moving device and a tray; the tray is arranged on the automatic horizontal moving device, and is used for containing the modules, and the automatic lifting mechanism comprises an automatic vertical motion device and a lifting positioning plate, the lifting positioning plate is arranged on the automatic vertical motion device, multiple first male and female abut-joint devices are fixedly arranged on the upper surface of the lifting positioning plate, a fixing mechanism is arranged on theautomatic vertical motion device, the modules are of frame structures, multiple second male and female abut-joint devices are arranged on the lower end of each module, and multiple third second maleand female abut-joint devices are arranged on the upper end of each module. The lifting mechanism is combined with the automatic transverse moving mechanism, the multiple modules can be automaticallydismounted and mounted, the problem that a current high-altitude work lifting mechanism shakes at high altitude is solved, and the potential safety hazards of manual dismounting and mounting can be removed.

The invention relates to a 3D printing operation guide plate for sport injury treatment, which is manufactured by utilizing a 3D printing technique. The 3D printing operation guide plate comprises assemblies A (1) and B (7), wherein the assembly A (1) is divided into an upper part and a lower part, the upper part is a guide pipe (3), the lower part of the assembly A (1) is a shell (4) clung to the surface of a talus (5), the shell (4) extends from the side face of the talus (5) to the bottom surface of the talus (5) and the neck of the talus (5), the assembly A (1) is provided with a marking hole (6) between the guide pipe (3) and the shell (4), the assembly B (7) is a guide pipe adapting to a bone hole manufactured after cleaning lesion with a trephine (2), the length of the assembly B (7) is equal to the depth of a bone hole to be drilled by the trephine (2), guide holes (9) are formed around the assembly B (7), a wedge-shaped locating gap (8) is formed in the upper edge of the assembly B (7), and the position of the wedge-shaped locating gap (8) is coincident with the position of the marking hole (6) of the assembly A (1). The 3D printing operation guide plate provided by the invention achieves individual treatment, remarkably improves the accuracy of location, relieves the pain of patients, and is suitable for popularization and use in the sport injury treatment.

The inVention relates to an easy-to-repair lead plastic hinge. The hinge comprises a first rotating unit and a second rotating unit, the first rotating unit and the second rotating unit are hinged andcan be rotated relatiVe to each other, an energy consuming unit is disposed at the hinge connection position of the first rotating unit and the second rotating unit, the energy consuming unit is composed of a plurality of lead blocks and a limit pin, the lead blocks are embedded between the contact faces of the first rotating unit and the second rotating unit, and the limit pin penetrates throughthe first rotating unit and the second rotating unit. When a normal situation or small earthquake occurs, the limit pin is not cut, and the plastic hinge is a rigid node; when a medium or large earthquake occurs, the limit pin is sheared, the plastic hinge rotates relatiVely, the lead blocks conduct plastic deformation, absorb energy and haVe a good energy-absorbing and shock-absorbing effect, after the earthquake, it is only needed to replace the limit pin, and the quick repairing of the plastic hinge can be achieVed.

A mobile phone middle frame polishing clamp comprises a supporting base and a positioning module. The positioning module is installed on the supporting base and comprises a plurality of positioning assemblies; the positioning assemblies are sequentially stacked; each positioning assembly comprises a layer connection board, a middle frame positioning part, a middle frame liner part and a splicing column, wherein the splicing column is arranged on the layer connection board and penetrates through the middle frame positioning part, and an insertion-connection groove is formed in the side face, away from the splicing column, of the layer connection board; and the splicing column of each positioning assembly is also in inserted connection with the insertion-connection groove of the layer connection board of the adjacent positioning assembly. The mobile phone middle frame polishing clamp is provided with the supporting base and the positioning module, so that a mobile phone middle frame is positioned through the positioning module, multiple mobile phone middle frames are clamped at the same time, the polishing efficiency of the mobile phone middle frames is improved, the positioning module is convenient to dismount, the number of the mobile phone middle frames clamped each time can be adjusted flexibly, and the clamping efficiency of the mobile phone middle frames is improved.

The invention discloses a multi-functional unmanned aerial vehicle. The vehicle comprises a lifting mechanism, a control mechanism, a power supply and a loading bracket, the lifting mechanism comprises a shell and lifting arms arranged at the periphery of the shell, and propellers are arranged at the end portions of the lifting arms; the propellers are provided with motors, the control mechanism and the power supply are arranged inside the shell, and a gravity center adjusting mechanism is arranged at the lower end of the loading bracket; the gravity center adjusting mechanism comprises a supporting plate, a locating shaft and a gravity center adjusting plate, an eccentric through hole is formed in the gravity center adjusting plate, and the locating shaft is located in the center of the supporting plate; the locating shaft penetrates through the eccentric through hole, suspension loops are arranged on the side wall of the gravity center adjusting plate, a plurality of locating holes corresponding to the suspension loops are formed in the supporting plate, and R-shaped locating pins are arranged on the suspension loops. According to the multi-functional unmanned aerial vehicle, thegravity center adjusting mechanism is arranged at the lower end of the loading bracket, the gravity center adjusting plate is rotatably and eccentrically arranged, so that the gravity center of the whole unmanned aerial vehicle is adjusted, and the gravity center adjusting mechanism is applicable to loading and use of loading equipment with different specifications and shapes.

The invention discloses a spiral tube type air-air heat exchanger in a circular passage, and relates to the field of air-air heat exchangers. The spiral tube type air-air heat exchanger in the circular passage comprises a plurality of heat exchanging units which are evenly arranged in the circular passage in the circumferential direction of the circular passage. Cold air flow in the circular passage moves in the axial direction. Each heat exchanging unit comprises a hot air flow inlet air collecting pipe and a hot air flow outlet air collecting pipe which are arranged in the flowing direction of the cold air flow and a plurality of spiral heat exchanging pipes, wherein the two ends of each spiral heat exchanging pipe communicate with the hot air flow outlet air collecting pipe and the hot air flow inlet air collecting pipe correspondingly. The spiral heat exchanging pipes are distributed in sequence in the flowing direction of the cold air flow to form a heat exchanging pipe bundle. An outlet of each hot air flow outlet air collecting pipe and an inlet of each hot air flow inlet air collecting pipe are located at the same end of the corresponding heat exchanging unit and penetrate through the inner wall or the outer wall of the circular passage. The other end of each heat exchanging unit is a free end.

The invention discloses an ocean flexible pipe protection device, which mainly consists of an iron chain, a hanging connector, pull rods, a protection net, middle connectors, a centralizing connectorand a centralizing rubber ring, and is characterized in that the upper end of the iron chain is hung on a lifting lug of a boat body; the lower end of the iron chain is connected with the hanging connector; the hanging connector is connected with the upper end of the pull rod through screw threads; the pull rod and the other pull rods are connected through the middle connectors; the centralizing connector is connected with the lower end of the pull rod through screw threads; the centralizing rubber ring and the centralizing connector are fixedly connected through a vulcanization process; the protection net is fixedly connected with the pull rods; each cross section of the ocean flexible pipe protection device is provided with 4 to 8 pull rods connected in parallel; the pull rods are uniformly distributed along the peripheral direction; the structure formed by the pull rods and the protection net is in a tubular shape; a flexible pipe penetrates through the tubular ocean flexible pipe protection device. The ocean flexible pipe protection device has the advantages that the structure is simple; the installation is convenient; the influence of crushed ice or floating objects on the flexible pipe arranged under a deck can be effectively reduced.

The invention discloses an offshore power generation system. The offshore power generation system comprises a platform body, fan blades, floats, transmission mechanisms, electric generators and positioning mechanisms. The platform body is of a frame structure composed of a plurality of transverse beams and a plurality of vertical beams; the floats, the electric generators and the transmission mechanisms are arranged on the platform body; one end of each fan blade goes deep into sea water, and the other ends of each fan blade is connected with one end of the corresponding transmission mechanism; the other ends of the transmission mechanisms are connected with the electric generators; and the fan blades are pushed by sea waves to rotate and drive the electric generator to work through the transmission mechanisms connected with the fan blades; and mechanical energy transmitted by the fan blades is converted into electric energy, and the positioning mechanisms connected with the platform body can ensure that large displacement cannot happen to the platform body, and the fan blades are located below the water surface constantly. According to the needs, the number of the fan blades, the number of the transmission mechanisms and the number of the electric generators can be flexibly adjusted, and the electric energy output of the power generation system can be flexibly controlled; the utilization rate of the sea waves can be improved; and the sea waves are utilized for achieving quantitative production of large-scale electric energy.

The invention discloses a novel vibration exciter. The novel vibration exciter comprises a gear box and a bracket, wherein a first bevel gear and a second bevel gear which are meshed with each other are rotationally arranged in the gear box through bearings, the two side faces of the first bevel gear and second bevel gear are circumferentially provided with symmetrical grooves of which the numberis even number, the grooves are internally provided with first eccentric blocks and second eccentric blocks, and a rotating shaft of the second bevel gear penetrates through an end cover of the gear box, extends to the outer portion of the end cover and is connected with a driving belt wheel. The novel vibration exciter has the advantages that the first eccentric blocks and the second eccentric blocks are embedded in the first bevel gear and second bevel gear, thereby shortening the length of a transmission shaft, so that the entire size is impact, the volume is greatly reduced, inner space ofthe gear box is effectively utilized, the installation positions and numbers of the first eccentric blocks and second eccentric blocks can be flexibly adjusted, thereby generating vibration excitingforce with different effects, so that different use requirements are met, and various product series can be developed by adopting a same structure and size, thereby saving the cost.

The invention discloses a method for producing transparent conducting film glass. The method comprises the following steps: (1) introducing a gaseous-state shielding layer precursor containing silane and an oxygen source to the glass surface at a temperature ranging from 460 to 480 DEG C by taking an inert gas as a carrier in an annealing kiln, carrying out photodissociation of the gaseous-state shielding layer precursor by use of a parallel incident laser beam and thus carrying out a chemical vapor reaction to form a shielding layer which is 50-90nm thick on the glass surface; (2) in the annealing kiln and in the glass temperature range of 435-455 DEG C, introducing a gaseous-state conducting layer precursor containing pre-gasified zinc and aluminum sources and the oxygen source to the glass surface on which the shielding layer is already deposited by taking the inert gas as the carrier, and causing the photodissociation of the gaseous-state conducting layer by use of the parallel incident laser beam and thus carrying out the chemical vapor reaction to form a conducting layer which is 250-400nm thick on the glass surface. The method has the advantages that the temperatures of the coating reactions are effectively reduced so that the quality of the film can be improved, and the utilization rate of the precursor gases is increased so that the working conditions of a float line can be kept stable.

The invention provides an LED display system, and relates to the technical field of LED display control. The LED display system comprises one or more display arms and a controller used for controllingthe display arms to work; each display arm comprises a strip-shaped shell and a plurality of LEDs evenly distributed on the front face of the strip-shaped shell, the controller comprises a circular connecting seat and a circuit shell, and an angle-adjustable connecting scheme is adopted between the display arms and the controller. According to the LED display system, based on the visual persistence principle, rich information such as colors, numbers, characters or patterns can be displayed only through the one or more display arms, the defects of large number, high cost and fixed display shape of a traditional full-screen LED are overcome, the LED display system can be conveniently and quickly mounted on a rotating blade or a rotating shaft, especially in an indoor environment, a certainscientific and fictional effect can be displayed, and the LED display system is suitable for billboards, entertainment display, scoreboards, home decoration and the like.

The invention discloses a top-mounted environment friendly mixing plant stock bin distribution structure. A mixing plant comprises a stock bin layer arranged at the top of an integrated frame; a plurality of stock bins are arranged on the stock bin layer; a supporting structure of the stock bins is located on the same plane at the top of the integrated frame; the shapes and sizes of all the stockbins are the same or similar; and according to the specific use requirements, the multiple rows of stock bins are arranged to be in a T type, a half-surrounded type or an in-line type. The stock bin structure and powder bins of the mixing plant are all uniformly arranged on the stock bin layer of the mixing plant. The arrangement is carried out based on several large round aggregate stock bins andpowder bins, small storage bins can be arranged in the middle, the structure is compact, and the floor area is small; and in addition, a mixing layer, a batching layer and a mixing layer platform areall unified large platforms, so that equipment maintenance and repair are convenient. All dust falling from the stock bins is concentrated in the stock bin layer, timely collection is convenient, dust flying is reduced, and the environment friendly performance of the mixing plant is improved.

The invention relates to a method for preparing a three-dimensional metal microneedle array by directly utilizing a razor blade. Firstly, double-sided razor blades serve as a microneedle preparing blank, a clamping tool is machined, and the blades are alternately stacked in a groove of the clamping tool; secondly, the blades are cut according to the shape and the size of the microneedle array, half-sheet type or whole-sheet type microneedle sheets are obtained, and the machined microneedle sheets are taken out for later use; and thirdly, a three-dimensional microneedle array packaging fixtureis designed and machined according to the packaging of the half-sheet type microneedle array and the whole-sheet type microneedle array, the microneedle sheets and gaskets are put into a packaging structure alternately, and fastening is carried out through bolts to obtain the three-dimensional microneedle array. According to the method, structural characteristics of a conventional razor blade arefully utilized, manufacturing procedures are few, cost is low, efficiency is high, a needle tip is sharp, and the method is suitable for large-batch manufacturing; according to the designed machiningtool, the blades are alternately stacked on cutting edge parts, gaps between the blades are reduced as much as possible, and the machining precision is improved; and the matched packaging structure issimple to use, convenient to carry, detachable to clean and disinfect and reusable.

The invention relates to an intelligent multi-tool rest composite camshaft sharp edge breaking system. The system involves a grinding machine, wherein a breaking mechanism is arranged on the grindingmachine, the breaking mechanism comprises a lifting driving mechanism, horizontal guide rails, tool seats, grinding heads, extendable guide rods, sliding blocks, positioning mechanisms, travelling mechanisms, grinding driving motors, and a digital control circuit, the lower end face of the lifting driving mechanism is hinged to the lower end face of a working table of the grinding machine, the upper end face of the lifting driving mechanism is hinged to the lower end faces of the horizontal guide rails, the sliding blocks are connected with the horizontal guide rails, the sliding blocks are hinged to the rear end face of the at least one extendable guide rod through rotating table mechanisms, the front end faces of the extendable guide rods are hinged to the tool rests, and the grinding driving motors are embedded in the tool seats and are connected with the grinding heads. According to the intelligent multi-tool rest composite camshaft sharp edge breaking system, on the one hand, theneed that grinding and breaking work are carried out on working surfaces of corner angle structures of various structures of camshafts with different structural sizes can be met; and on the other hand, parts of the grinding heads can be flexibly adjusted and replaced, so that the cost of the breaking work is effectively reduced while the breaking work efficiency and the working precision are improved.

The invention relates to the technical field of electric power equipment, in particular to a novel box-type transformer, the novel box-type transformer comprises a housing and a top cover arranged above the housing, A transformer is arranged in the shell, A maintenance door is arranged on that front surface of the shell, the access door is provided with a door lock, A plurality of heat dissipationchannels are arranged on the shell, A U-shape structure is adopted for that whole heat dissipation channel, At both end, that openings are insert into the housing, communicating with the interior ofthe housing, A baffle plate is arranged in the middle of the heat dissipation channel, The upper and lower ends of the baffle plate are respectively provided with a first fan and a second fan, the shell of the right end of the heat dissipation channel is provided with a louver, the shell close to the two sides of the access door is respectively provided with a left turn handle and a right turn handle, the left turn handle and the right turn handle are both provided with insertion strips, and the two sides of the back surface of the access door are respectively provided with clamping slots. Compared with the prior art, the invention has the advantages that the invention discloses a novel box-type transformer, the structure is simple, the heat dissipation effect is good, the anti-theft property is strong, and the box-type transformer is worth popularizing and using.

The invention discloses a multi-frequency band covering antenna structure of a mobile communication terminal based on a grid structure, which is arranged on the upper end surface of the mobile communication terminal and is a grid metal frame structure. The outer frame size of the grid metal frame is consistent with the upper end surface outline size of the mobile communication terminal shell. Themesh metal frame comprises a plurality of columns equally distributed along the short side direction of the upper end face and the long side direction of the upper end face, a longitudinal horizontalbar and a transverse horizontal bar connecting all the upright columns, the longitudinal horizontal bar and the upright columns forming a plurality of rectangular sub-grids of the same size in a vertical plane, the longitudinal horizontal bar and the transverse horizontal bar forming one layer of the grid metal frame, the grid metal frame comprising at least two layers. The invention is applied toa multi-frequency band antenna system of a terminal, realizes joint coverage of a plurality of frequency points through a metal grid structure, and can well cover radiation requirements of a plurality of frequency bands.