35results about How to "Little change in structure" patented technology

The invention discloses a positioning and resetting structure of a hand-operated direction valve comprising a hand-operated direction mechanism, a valve body, a valve core, a rear end cover, a rear cover and a positioning and resetting mechanism, wherein the positioning and resetting mechanism comprises a return spring, two spring seats, a positioning spring, a pressure pad, a positioning ball group and a positioning sleeve; the left spring seat and the right spring seat are both sheathed on the valve core and can axially slide along the peripheral surface of the valve core; the positioning spring and the positioning ball group are arranged in the cavity of the valve core; the positioning sleeve is arranged in the cavity formed by the rear cover and can slide in the cavity; and the inner peripheral surface of the positioning sleeve is provided with an annular step. The invention is especially suitable for the hand-operated direction valve and has the advantages that the direction valve has both positioning function and automatic resetting function and has convenient operation, good operation hand feel, low transformation cost, easy realization and the like.

The invention discloses a paver screed satisfying transverse vibration uniformity, comprising a combined type screed which is composed of a plurality of sections of screeds, wherein, vibrators are arranged on a plurality of sections of screeds; each vibrator comprises a partiality axis, a bearing arranged on the partiality axis and a bearing base fixed on the screed, wherein, the partiality axis is provided with a power driving mechanism connected with a power source; the nominal amplitudes of a plurality of sections of screeds are identical and are equal to a constant of A0, namely, Ai=mi*eI / Mi=A0=(sigma mi*ei) / sigma Mi, wherein, the mass of the partiality axis mi=Fi*Li*rho, a partiality distance ei=ai*D<2>i / (D<2>i-d<2>i), the section area of the partiality part of the partiality section of the partiality axis Fi=pi*(D<2>i-d<2>i) / 4, wherein, Li is the length of the partiality section of the partiality axis, rho is material density of the partiality axis, Di is cylinder diameter of the partiality section of the partiality axis, di is cylinder diameter of journal of the partiality axis and alpha is the space between the cylinder axis of the partiality section of the partiality axis and the cylinder axis of journal. The invention has the advantages of reasonable design, convenient improvement method, good improvement effect and reliable work performance and can effectively solve the problem of poor transverse vibration uniformity along screed width direction of paver in work.

The invention belongs to the field of cables, in particular a cold-resistant aluminum alloy cable. The cold-resistant aluminum alloy cable comprises an insulating layer-coated aluminum alloy conductor main body, a shielding layer coated on the outside of the aluminum alloy conductor main body and a filling layer filled in the gap between the aluminum alloy conductor main body and the shielding layer; the outside of the shielding layer is provided with an insulating outer layer, a shape of the cross section of the insulating outer layer rotating around a vertical shaft is drop-shaped, and a spiral steel wire rotating around the outside of the aluminum alloy conductor main body is further arranged in the shielding layer, the outside of the spiral steel wire is provided with an expansion connecting conductor parallel to the aluminum alloy conductor main body, and a section of expansion connecting conductor is arranged at regular screw pitches. The aluminum alloy cable of the technical scheme is simple in structure, the snow accumulation and freezing conditions on the cable surface can be reduced, and the cable further can resist the severe cold.

The invention provides a drainage system for a vehicle sunroof. The sunroof includes a frame arranged along the width direction of the vehicle, a sealing member arranged on the frame, and a guide rail matched with the frame. The drainage system includes a The drainage groove and water outlet on the frame, and the drainage channel provided on the guide rail, wherein the seal is arranged at the junction of the frame and the guide rail, and forms a temporary storage area for accumulated water, through The guide member guides the running water accumulated in the temporary water storage area to the drainage channel of the guide rail. With the drainage system according to the present invention, since the water accumulation position at the lowest point of the frame is changed to the water accumulation temporary storage area defined by the sealing member, and the flowing water in the accumulation water temporary storage area is guided to the drainage channel of the guide rail through the guide member , Effectively avoid water accumulation or seepage from the connection between the frame and guide rail into the interior of the compartment, and better improve driving comfort.

The invention relates to an anti-counterfeit mark structure, in particular to an anti-counterfeit approval certificate. The anti-counterfeit approval certificate comprises an approval certificate body, a fragile sticker is connected to the back side of the approval certificate body and glued to the surface of a coil, a spray portion is arranged on the front side of the approval certificate body, a transfer-preventive layer covers the front side of the approval certificate body and the spray portion, a working surface of the transfer-preventive layer is connected with No.2 fragile glue, the No.2 fragile glue is connected to the front side of the approval certificate body, and connection points where the No.2 fragile glue is connected with the approval certificate body are positioned around the spray portion. The anti-counterfeit approval certificate is transferred and reused difficultly.

The invention discloses an extension desktop mounting structure which comprises extension desktops. Two support rods are mounted on the back of each extension desktop, one end of each support rod extends out of a side edge of the corresponding extension desktop, support portions are arranged at extending ends of the support rods, two latches A are mounted on the back of each extension desktop and are positioned on the extending sides of the corresponding support rods, limiting structures are arranged on the back of a desktop of a desk, the support portions of the support rods can be inserted into the limiting structures, the limiting structures can limit the support portions when the support portions move, and latches B are mounted on the back of the desktop of the desk; when the two support rods of each extension desktop are inserted into the back of the desktop of the desk, the support portions are inserted into openings, and the extension desktops can be fixedly locked on the desk after the latches A and the latches B are fixedly fastened. According to the technical scheme, the extension desktop mounting structure has the advantages that the extension desktop mounting structure is simple and reasonable, connection structures of the extension desktops and the desktop of the desk are stable, the extension desktops can be quickly and conveniently mounted, the structure of the desk is not changed significantly, and the extension desktops can be completely detached and separated from the desk.

The invention discloses a method for preparing strontium-rich activated carbon by the aid of hydrothermal processes. The method includes steps of a), pretreating activated carbon, to be more specific,placing the proportioned activated carbon in diluted edible hydrochloric acid solution, heating the proportioned activated carbon in the diluted edible hydrochloric acid solution, carrying out impurity removal cleaning, further carrying out suction filtration, repeatedly washing the activated carbon, washing off surface residual acid liquid, boiling the activated carbon by water, then repeatedlyrinsing the activated carbon until the pH (potential of hydrogen) value of the activated carbon is 6.5-8.5, placing the activated carbon in drying ovens and drying the activated carbon for standby application; b), impregnating and loading strontium salt, to be more specific, slowly adding the pretreated proportioned activated carbon into impregnation liquid with diffusing agents and coupling agents, impregnating and stirring the activated carbon for 10 min, then adding strontium salt solution into the impregnation liquid and uniformly mixing and stirring the strontium salt solution and the activated carbon with each other in the impregnation liquid; c), carrying out hydrothermal reaction procedures, to be more specific, placing impregnated activated carbon solution in hydrothermal reactionkettles, keeping the temperatures constant for 2-6 hours after the hydrothermal reaction temperatures are increased and reach 130-250 DEG C and the pressures of the reaction kettles reach approximately 1MPa, carrying out still standing and temperature reduction after reaction is completely carried out, carrying suction filtration and cleaning, washing off surface residual impregnation liquid, then placing reaction products in drying ovens, and drying the reaction products at the temperatures of 120-150 DEGC to obtain the impregnated-hydrothermal strontium-rich activated carbon.

The invention discloses a wide frequency range self-adaptive repetitive control method of an active power filter. Firstly, the phase-locked loop is used to track the voltage frequency signal of the power grid in real time, and the switching frequency and the real-time power grid frequency are calculated under the premise that the switching frequency remains unchanged. Finally, the integer part of the ratio is taken as the number of beats of a fundamental wave lag of the improved repetitive controller, and the fractional part of the ratio is used to form the delay link, which is approximated by the first-order inertial link. In this way, in the case of grid frequency fluctuations, it can be ensured that the resonant frequency of repeated control is consistent with the actual fundamental and harmonic frequencies of the grid, so that the compensation effect of the active power filter will not be reduced when the grid frequency fluctuates.

The invention discloses an inserted chassis diagonal-brace structure of a tower crane and belongs to the technical field of the tower crane. The diagonal-brace structure of the tower crane comprises a base section, a chassis section and a diagonal brace, wherein the bottom end of the base section is vertically and fixedly connected to a crossed beam; the bottom end of the chassis section is fixedly connected to the top surface of the base section; the diagonal brace is arranged to be inclined to the crossed beam, the bottom end of the diagonal brace is fixedly connected with the crossed beam, while the top end of the diagonal brace is fixedly connected with the chassis section, a double-lug plate with a U-shaped structure and fixedly connected with the diagonal brace is arranged at the top end of the diagonal brace, and the inner width dimension of the U-shaped structure of the double-lug plate is matched with the width dimension of a main chord; the top end of the diagonal brace is sleeved on the main chord of the chassis section through the double-lug plate, and the top end of the double-lug plate is fixedly connected with the main chord of the chassis section through a connecting piece. The chassis section is reduced in overall structure dimension and strong in transportation convenience, and simultaneously, the stress condition at the connection part is improved and the weld joint quality requirement is effectively reduced. The diagonal-brace structure of the tower crane is simple and is easy to manufacture and low in manufacturing cost.

The invention relates to a compound jet pump based on the combination of center jet flow and annular jet flow. The compound jet pump comprises a working water pipe, a center nozzle, an annular nozzle,a water suction tube, a suction-in chamber, a throat tube inlet section, a throat tube, a diffusing tube and a water outlet tube. The compound jet pump further comprises a center nozzle control valveand an annular nozzle control valve. The center nozzle is arranged at the center of the annular nozzle. The center jet flow and the annular jet flow are combined. The compound jet pump solves the problems that a single center jet pump or single annular jet pump is low in efficiency, and the properties can be turned to be poor after working condition change. Compared with a traditional center jetpump and annular jet pump which are mostly used at present, the compound jet pump is small in structural change, the required parts are not greatly increased and technological processing can be achieved easily. The working efficiency is high, the problems which cannot be achieved by the traditional single jet pump are solved, and thus the application prospects are broad.

The invention relates to a para-aramid nanofiber membrane and a preparation method thereof, belonging to the field of special fiber materials. The invention provides a method for preparing a para-aramid nanofiber membrane. The preparation method is as follows: first, adding a spinning aid to a para-aramid fiber solution to obtain a uniform spinning solution, and then passing the resulting spinning solution through electrostatic The method of spinning makes para-aramid fiber membrane; Wherein, described spinning aid is a kind of in polyethylene oxide, polyvinylpyrrolidone or polyvinyl alcohol, and spinning aid and para-aramid The mass ratio of the para-aramid fiber in the fiber solution is: 10 parts by weight of the para-aramid fiber and 1-12 parts by weight of the spinning aid. The present invention successfully realizes the preparation of continuous para-aramid nanofiber membrane by electrospinning method for the first time; and by changing the collection device of electrospinning, two structural forms of random distribution and certain degree of orientation are obtained. film.

The invention relates to a low-temperature brazing method of a cutter. A low-temperature brazing parent part and a hard alloy blade are adopted, brazing flux is coated onto the surfaces of the parent part, brazing filler metal, a copper sheet and the hard alloy blade, the brazing filler metal is added between the parent part and the copper sheet or between the hard alloy blade and the copper sheet, the copper sheet is respectively welded onto the parent part and the hard alloy blade, then the welded part is immediately placed in a heat preserving furnace at 280-300 DEG C for preserving heat for 6-7h, the part is cooled to room temperature with the furnace after the temperature is decreased to 100-150 DEG C and the heat is preserved for 10-12h, the bottom of base metal is slowly heated, heating is stopped when the brazing flux starts to melt and can freely flow, heating is continuously performed when the brazing flux cannot flow smoothly, repetition for several times is performed in such way to weld the hard alloy blade onto the base metal, and finally the welded part is cooled to room temperature with the furnace in the heat preserving surface at 100-150 DEG C. The low-temperature brazing method of the cutter has the advantage of high production efficiency and avoids the problems that the hard alloy blade is cracked and ruptured and the like.

The invention discloses a table with a table top capable of extending. The table comprises a table body and the extending table top, wherein two supporting rods are installed on the back portion of the extending table top, one end of each supporting rod stretches out of one side edge of the extending table top, stretching ends of the supporting rods are provided with supporting portions, two buckling portions A are installed on stretching sides of the supporting rods on the back portion of the extending table top, limiting structures capable of allowing the supporting portions of the supporting rods to be inserted in and limiting moving of the supporting portions are arranged on the back portion of the table top of the table body, and buckling portions B are installed on the back portion of the table top of the table body; when the two supporting rods of the extending table top are inserted into the back portion of the table top of the table body, the supporting portions are inserted into openings, and the buckling portions A and the buckling portions B are buckled and fixed, and the extending table top is fastened and fixed to the table body. According to the technical scheme, the table is simple and reasonable in structure, a connecting structure between the extending table top and the table top of the table body is firm, installation is fast and convenient, the structure of the table body is slightly changed, and the extending table top can be completely disassembled and separated.

The invention relates to a separator for lithium batteries and a preparation method thereof, belonging to the field of battery separators. The invention provides a separator for a lithium battery, which is a para-aramid nanofiber membrane, which is prepared by the following preparation method: first, a spinning aid is added to a para-aramid fiber solution to obtain a uniform spinning solution, and then the resulting spinning solution is made of para-aramid nanofiber membrane by electrospinning; wherein, the spinning aid is polyethylene oxide, polyvinylpyrrolidone or polyvinyl alcohol In one, the mass ratio of the spinning aid to the para-aramid fiber in the para-aramid fiber solution is: 10 parts by weight of the para-aramid fiber and 1-12 parts by weight of the spinning aid. The separator for lithium batteries obtained by the invention has excellent thermal stability and mechanical properties; on the premise of excellent electrochemical properties, the safety of lithium batteries is greatly improved.