163 results about "Maintenance engineering" patented technology

According to the present invention, the most challenging issues in this work have been to find systematic ways of enabling maintenance engineers to decide an adequate time for the replacement of vacuum pumps on the basis of their current performance assessment result. Further, the comparison of the currently evaluated diagnostics analysis results and the initial (or reference) data set is shown to enable maintenance engineers to decide the replacement of the considered vacuum pump according to the evaluated pump performance indicators. This quantitative diagnostic analysis result is expected not only to enable maintenance engineers to decide an adequate time for the replacement of vacuum pumps on the basis of their current performance assessment results but also to improve the reliability and confidence of the predictive maintenance of low vacuum pumps.

The invention relates to a traction and maintenance engineering vehicle of a maglev train, which is important necessary equipment for the maintenance of a maglev line. Battery is used as power sourceand AC motor is controlled by inverter system to drive running system. 3-axle power bogies and guide device are used to ensure that wheels of the engineering truck run on the non-inductive plate partof the F-type rail surface, so as to ensure the safety of the engineering truck overhaul operation and the traction rescue maglev train; And reliably connecting or releasing the connecting state withthe medium-low speed maglev train by the traction connecting device; And through the electrical control system to accurately control the driving, braking, traction and other operations. The engineering vehicle is suitable for the operation of maglev depot, comprehensive base and line, undertaking maglev train traction and rescue, regular patrol inspection of track / contact rail, spare parts repairand replacement, auxiliary staff and material transportation, as well as dust and snow removal under special weather conditions.

The invention discloses a method for accurately measuring the elastic modulus of tunnel rock in a cold region after repeated freeze-thaw damage. The method comprises the steps of: A, micro-crack propagation half-length 1N=Delta 1N+1(N-1) (32); B, the corresponding micro-crack density parameter beta is expressed as the formula(33) shown in the specification; C, the number of propagated and activated micro-cracks in the unit volume is as the formula(34) shown in the specification; D, the effective elastic modulus of the rock is expressed as the formula(30) shown in the specification; and E, substituting the formulas (32) to (34) into the formula (30), and solving the EN to obtain the equivalent elastic modulus of tunnel surrounding rock after N times of freeze-thaw. According to the method for accurately measuring the elastic modulus of tunnel rock in a cold region after repeated freeze-thaw damage, the method has the advantages of being accurate and fast; the foundation is provided forthe calculation of the frost heaving force of the surrounding rock under the repeated freeze-thaw damage condition; and a practical guide is provided for the direction and the method of the construction operation of the rock tunnel maintenance engineering.

The invention relates to a water-based anticorrosive coating with rust and a preparation method thereof. The water-based anticorrosive coating with the rust comprises the raw materials: 22-35 parts of de-ionized water, 35-45 parts of a fluorine-containing emulsion with the rust, 1-3 parts of an additive, 8-13 parts of an antirust pigment, 1-3 parts of color paste, 5-10 parts of filler, 2-8 parts of a transforming agent or a rust stabilizing agent, and 1.5-3.5 parts of an anti-settling agent, wherein the fluorine-containing emulsion with the rust is a coreshell emulsion prepared from a monomer, an emulsifying agent and an initiating agent; the emulsifying agent comprises the components of a phosphate emulsifying agent and a sodium sulfonate emulsifying agent; a shell part comprises the transforming agent or the rust stabilizing agent. The preparation method comprises the following steps of: stirring part of the de-ionized water, the additive, the transforming agent or the rust stabilizing agent, the anti-settling agent, the antirust pigment and the filler, and grinding the mixture into slurry; adding the fluorine-containing emulsion with the rust and the like while stirring to prepare the anticorrosive coating with the rust. The coating is nontoxic, odorless, non-combustible, non-explosive, non-volatile and low in VOC (volatile organic compounds), can be used for replacing a derusting and descaling process; a protective primer with a high adhesion force is formed; a conventional derusting process can be replaced; the coating can be directly applied to a steel structure or maintenance engineering of mechanical equipment.

The invention provides modified asphalt. The modified asphalt comprises base asphalt, a modifying agent, a lignin stabilizing agent, maleic acid mono-lauryl La, rubber powder and a mineral filler, wherein the modifying agent is obtained by taking a styrene-butadiene-methyl methacrylate polymer as a base material and the lignin stabilizing agent is extracted by adopting an alcoholic solvent with high boiling point; and the modifying agent is prepared through the following method: under the action of a thermal polymerization initiator, the styrene-butadiene-methyl methacrylate polymer and reactive monomers are polymerized in a solvent, and then, the modifying agent is obtained. The modified asphalt has the advantages of high softening point, high extension degree, excellent elastic recovery, long storage time and high stability, when the modified asphalt is used in the process of road construction, the maintenance engineering for expressways of our country can be improved, the service lives of the expressways are prolonged, and the road level of service is improved.

The invention discloses a novel hollow composite slab, which comprises a flat steel plate, a plurality of holed steel plates, and a plurality of steel pipes, the holed steel plates are parallel and are vertically welded on one plane of the flat steel plate, the plurality of steel pipes respectively pass through corresponding round holes of the holed steel plate and are welded with the round holes, the flat steel plate, the plurality of holed steel plate, and the plurality of steel pipes combine into a hollow slab support, and the hollow slab support is poured with light aggregate concrete to finally form the steel plate-light aggregate concrete hollow composite slab. The novel hollow composite slab of the invention has light weight, convenient construction, higher strength and rigidity, and better bearing performance, can be widely applied to the bridge slabs of new bridges and house buildings, the basement top board or room floor, and can be also applied to the bridge slab replace and maintenance engineering.

A method of configuration controlling a hierarchy of data arrays is disclosed, each data array in the hierarchy having at least one version, each version of each data array in the hierarchy being associated with one version of at least one other data array in the hierarchy, each data array comprising at least one data entry, each data entry comprising a plurality of fields, the plurality of fields comprising a version field and at least one characteristic field having a characteristic, the version field indicating which version of that data array the associated characteristic fields belong to. The method comprises the steps of: (i) defining a package of data arrays comprising a predetermined version of at least two data arrays in the hierarchy and in which at least one of the data arrays is to be updated to a new version based on a previous version; and (ii) appending a new version indicator indicative of the new version to each data entry having the previous version in the at least one of the data arrays. By associating data entries with more than one version, the need to copy all the data entries within a data array to be updated is obviated. This in turn reduces the amount of additional data which needs to be created and can simplify the relationships between characteristics in different levels of the hierarchy.