195results about How to "Good production safety" patented technology

Disclosed are a method for joining two or several metal sheets or profiled parts, particularly of a vehicle body segment, and a vehicle body segment. Said method for joining two or several metal sheets or profiled parts, one of which is typically made of a higher-strength steel, comprises the following steps: a) the metal sheets or profiled parts are mechanically connected in a positive and/or non-positive manner at one or several junctions, whereupon b) the junctions are thermally joined using pressure welding. The inventive method makes it possible to produce body segments that are provided with top quality spot-welded joints, especially in the motor vehicle sector.

The invention relates to the technical field of mineral separation, in particular to a novel tailings dewatering process which is characterized by comprising the following steps of: firstly, feeding tailings to a swirler, feeding settled sand of the swirler to a dewatering screen, feeding overflow of the swirler to a thickener, and returning undersize products of the dewatering screen to the swirler, wherein the undersize products of the dewatering screen are final products with water content of 14-16 percent; and feeding the overflow of the thickener to a clarifier, feeding underflow of the thickener to a filter press, recycling water separated from the clarifier, feeding the underflow of the clarifier to the filter press, and returning filtrate of the filter press to the thickener, wherein filter cakes of the filter press are final products with water content of 9-10 percent. The invention can realize tailings online dewatering, thereby saving funding, enabling the tailings to be directly used online, ensuring the smooth operation of subsequence works, and being beneficial to the environment protection and the production safety.

The invention provides a continuous stoping and filling mining method for a gently inclined medium-thick ore body and belongs to the technical field of mining. According to the continuous stoping andfilling mining method, the gently inclined medium-thick ore body is divided into sections in the vertical direction, the ore body is divided into stoping units, the stoping units are divided into strips in the moving direction of the ore body, separation pillars are reserved between the adjacent strips in the moving direction of the ore body, inclined ramps are excavated in the separation pillars,and stope connection roadways are excavated along the inclined ramps; the strips in the same stoping unit are divided into six first-step stopes and six second-step stopes, interval stoping is conducted on the stopes in the same stoping units, stoping is conducted on the first-step stopes firstly, then the first-step stopes are filled, and after filling body curing reaches the specified time, stoping is conducted on the second-step stopes; and after several adjacent stoping unit ore main bodies are completely mined and the stopes are filled, the stoping is conducted on the separation pillars,top safety pillars and bottom safety pillars between the stoping units. According to the continuous stoping and filling mining method, the mechanical degree is high, the production capacity is high,the ore stoping rate is high, the ore dilution rate is low, and safety is good.

The invention discloses a detaching and recycling system for electric energy meter package boxes. The system comprises a full box conveying line, a sorting conveying line, a box opening device on the full box conveying line, a rack, a cover fetching device, a sorting device and a waste package box processor. The box opening device comprises a support, a rotary tool, a first package box positioning assembly and a coordinate robot. The cover fetching device comprises a suspension module fixed to the rack in a suspended mode, a second package box positioning assembly, a cover fetching air cylinder and a cover removing module. The cover removing module comprises an upper cover removing assembly and a paper holder removing assembly. The sorting device comprises a third package box positioning assembly used for grasping electric energy meters, a vacuum suction cup claw and a Delta robot, wherein the Delta robot is fixed to the rack and used for driving the vacuum suction cup claw to move. The detaching and recycling system for electric energy meter package boxes can automatically open electric energy meter package boxes, fetch covers, sort boxes and process waste package boxes, and is high in production efficiency, low in labor intensity and good in production safety.

The invention relates to a method for preparing and purifying watermelon ketone. According to the method, 4-methylcatechol and 1,3-dichloroacetone are used as raw materials to prepare a watermelon ketone rough product, and the watermelon ketoxime with the high purity is obtained by carrying out oximation, crystallization and purification on the watermelon ketone rough product; and then, the watermelon ketone with high purity is obtained by carrying out oxime removing on the watermelon ketone through oxidization or reduction or hydrolysis. The method disclosed by the invention has the advantages of good selectivity, high yield, wide raw material source, low price, and reasonable and feasible process design.

The present invention provides the preparation process of one kind of emulsifier for powdered emulsified explosive. The polymer emulsifier with excellent emulsifying performance and high emulsifying stability is prepared through the reaction between alkyl carboxylic acid or carboxylic anhydride and the mixture of several kinds of alcohol amine compounds. The powdered emulsified explosive prepared with the emulsifier has high explosion performance, high stability and long storing period.

The present invention relates to a process for processing a metal plate into a revolving body with a thick wall in rotary extrusion way, which belongs to the field of the mechanical manufacturing engineering, and in particular relates to the manufacturing of a plate processing device and a rotary extrusion mold, and consists of a metal circular plate 1 with a process hole, a rotary wheel 4, a rotary wheel 5, an upper die seat 6, a lower die seat 7, a wheel bracket 8 and a wheel bracket 9, wherein, the rotary wheel 4 is installed on the wheel bracket 8 through a rotary shaft to assemble a work station a; the rotary wheel 5 is installed on the wheel bracket 9 through a rotary shaft to assemble a work station b; the end surface of the rotary wheel 4 is a concave arc; the end surface of the rotary wheel 5 is a plane. The process of the present invention has the advantages such as simple structure, low energy consumption, material conservation, good production safety, convenient commissioning operation, good quality, low cost, etc., which not only changes the traditional processing method, but also thickens the wall of the product, and can be applied to different fields, and is an important process for the processing of the metal plate at present.

The invention discloses a trackless self-protecting full-position automatic welding device and a welding process thereof. The device comprises a full-position automatic welding robot, a semiautomatic self-protecting welding machine driven by the full-position automatic welding robot to weld, and a wire feeding machine. The welding process comprises the following steps: sticking a guiding line for photoelectric tracking and guiding at an edge of a welding joint; scanning size of a welded junction section of the welding joint and relative positions of the welded junction section and the guiding line through a photoelectric tracking device, and carrying out automatic blurry memory; inputting welding technological parameters into a control system according to scanning results, or automatically selecting the welding technological parameters by the control system, and carrying out the automatic blurry memory; controlling a running trolley to run along the guiding line by the control system, and performing welding by a welding gun of the semiautomatic self-protecting welding machine fixed on the running trolley. The welding device has the advantages of reasonable structure and simple and convenient operation, can also improve welding efficiency at the same time of ensuring obtaining good welding joint, reduces labor intensity, and saves engineering cost.

The invention discloses a preparation method for a graphene nanobelt-lithium iron phosphate composite material, and belongs to the technical field of a lithium ion battery. A carbon nanotube is subjected to chemical cutting and ultrasonic peeling to prepare a graphene nanobelt; then commercial lithium iron phosphate is endowed with positive static charges through a surfactant; and next, the prepared graphene nanobelt and the lithium iron phosphate are ultrasonically-mixed and dried to prepare the graphene nanobelt-lithium iron phosphate composite material product. The preparation method has the characteristics of simple process, convenient operation, capability of promoting large-scale production, convenience in popularization and application, low energy consumption, low production cost, high production safety and the like; the product prepared by the preparation method has the characteristics of excellent conductivity, high ionic transport property, long cycle life, high rate charge-discharge performance and the like; the preparation method can be widely applied to the preparation of the graphene nanobelt-lithium iron phosphate composite material; and the product prepared by the preparation method can be widely used as a positive electrode material to be applied to the lithium ion battery which has high requirement on cycle performance and rate capability.

The invention discloses a preparation method of a straw self-decomposed compound fertilizer. The method is characterized by comprising steps as follows: mixing and decomposing a straw decomposing agent and a culture material to prepare a decomposed culture material; mixing and granulating straw powder, straw fibers and the decomposed culture material to prepare the granular straw self-decomposed compound fertilizer. The invention further discloses the compound fertilizer prepared with the method. The compound fertilizer is prepared from components as follows: 50-70 parts of the straw powder, 30-40 parts of the straw fibers, 6-16 pars of porous granule carriers, 3-5 parts of the straw decomposing agent, 20-30 parts of a decomposition culture mixed powder and a proper amount of water, the compound fertilizer adopts a granular structure through culture, mixing and granulation, the average diameter of granules ranges from 2 cm to 6 cm, and the moisture content of the granules ranges from 50% to 65%. The invention further discloses an applying method of the fertilizer. The fertilizer mainly adopts plant straw, can be sown into soil after quick granulation, is self-decomposed and free of residues and pollution, can directly improve the soil structure, can utilize waste and has greater social benefit of environmental protection.

The invention belongs to the technical field of cable facilities in transformer substations, and particularly relates to a prefabricated finished cable trench. The prefabricated finished cable trench comprises a plurality of cable trench bodies and cable holders in the cable trench bodies. Each cable trench body comprises a first base plate and a second base plate which are connected fixedly. First trench walls and first square steel sets are arranged on the upper end faces of the first base plates from left to right. First cover plates are arranged at the upper ends of the first trench walls and the first square steel sets. Second square steel sets and second trench walls are arranged on the upper end faces of the second base plates. Second cover plates are arranged at the upper ends of the second squire steel sets and the second trench walls. The prefabricated finished cable trench has the advantages that the longitudinal depth design of conventional cable trenches is changed into flattening design, so that on the premise of guaranteeing utilization rate of cable channel sections, construction difficulty in laying of cables is reduced, and convenience is brought to follow-up maintenance and operation; multiple prefabricated modules are matched flexibly to splice cable trenches with different widths, and the prefabricated finished cable trench is applicable to cable laying at different places.

The invention discloses a rotor shaft processing technic, which is characterized by the following steps of punching to form a blank; roughly grinding: roughly turning a shaft section A and a shaft section B; hardening and tempering; finely grinding; finely turning the shaft section A and the shaft section B; grinding tapers; performing high-frequency thermal treatment on a conical part and a small-shaft part, and tempering; hobbing; performing high-frequency thermal treatment on formed teeth and tempering to form a semi-finished product; grinding the semi-finished product at three stages; screeding; and performing rust prevention treatment and inspecting. The invention further discloses a rotor shaft. Most equipment are operated automatically, so that the production efficiency is increased, high production safety, high quality of the produced rotor shaft and high product accuracy consistence are achieved, and waste products are reduced by over 60 percent in comparison to an original process; and the rotor shaft processing technic has the advantages of saving raw materials, reducing production cost and saving energy consumption.

The invention discloses a synthesis method of N-phenyl-3(4-bromophenyl) carbazole. The synthesis method is characterized in that carbazole is selected as a raw material and is subjected to Ullmann reaction with iodobenzene to prepare N-phenyl carbazole; N-phenyl-3-bromine carbazole is synthesized by NBS (N-bromosuccinimide) bromination; N-phenyl-3-boric acid base carbazole is prepared through Grignard coupling; and N-phenyl-3-boric acid base carbazole and p-bromoiodobenzene are subjected to cross coupling to obtain N-phenyl-3(4-bromophenyl) carbazole. The method provided by the invention has the characteristics of high yield, low production cost, less three-waste emission and high target compound selectivity and yield, a high-efficiency loaded catalyst is used, and isomer is reduced.

The invention discloses a synthesis method of medroxyprogesterone acetate. The method comprises the following steps of: 1) enabling 17 alpha-hydroxyprogesterone and ethylene glycol to perform ketalation under the catalysis of para-toluenesulfonic acid to obtain a ketal; 2) enabling the ketal to perform epoxidation reaction under the action of a peroxyacetic acid solution of anhydrous sodium acetate to obtain an epoxide; 3) enabling the epoxide and methylmagnesium bromide to perform Grignard reaction, and then performing hydrolysis reaction by dilute sulphuric acid to obtain a Grignard matter; 4) performing hydrolysis on the Grignard matter by glacial acetic acid to perform deprotection so as to obtain 5 alpha, 17 alpha-dihydroxy-6 beta-methyl progesterone; 5) performing hydrogenation translocation reaction under the action of hydrogen chloride to obtain 6 alpha-methyl-17 alpha-hydroxyprogesterone; and 6) enabling the 6 alpha-methyl-17 alpha-hydroxyprogesterone to perform acetylation reaction with acetic acid and acetic anhydride so as to obtain the medroxyprogesterone acetate. During the reaction process of the method disclosed by the invention, the use of a precious metal catalyst, namely palladium on carbon is avoided, the cost of auxiliary materials and the recovery cost are greatly reduced, the reaction conditions in each step are mild, the violent heat release and deflation phenomena are avoided, and the safety in production is good.

The invention provides a preparation method for a magnetic graphene nanobelt/graphene composite film. According to the preparation method, ferromagnetic metal nanoparticles wrapped with carbon nano onions grow on the surface of the graphene nanobelt and the surface of the graphene composite film in an in-situ growth manner through a two-step chemical vapor deposition method. The graphene composite film can be transferred to a target matrix without the assistance of a polymer during the transfer process and has the beneficial effects of strong in magnetism, high in optical transparency and high in hole/electron mobility. In addition, the ferromagnetic metal nanoparticles are wrapped with shells of the carbon nano onions so that oxidation, acidification, shedding and the like of the ferromagnetic metal nanoparticles can be avoided, so that the graphene composite film has high strength and good stability. By the adoption of the preparation method, the magnetic graphene composite film can be obtained through macroscopic preparation by the adoption of the two-step chemical vapor deposition method; by the adoption of the method, the technological process is simple, the cost is low, and large-scale production is facilitated; and the method can be widely applied to graphene spintronic devices, electromagnetic wave absorbing materials, flexible graphene film electronic devices and the like.

Belonging to the technical field of nano carbon fiber composite materials, the invention relates to a preparation method of a graphene nanoribbon in situ toughened nano carbon fiber. The method includes: firstly preparing an easily dispersible graphene nanoribbon, taking a macromoleclar polymer as the raw material, preparing a nano carbon fiber precursor solution, dispersing the graphene nanoribbon in the nano carbon fiber precursor solution, and conducting stirring dispersion, electrostatic spinning and heat treatment to obtain a graphene nanoribbon in situ toughened nano carbon fiber product. The method has the advantages of simple process, convenient operation, is conducive to realizing large-scale production, is convenient for popularization and application, and is low in cost. As the edge of the graphene nanoribbon and nano carbon fiber have in situ covalent interaction, the graphene nanoribbon in situ toughened nano carbon fiber prepared by the method has good electrical conductivity, good thermal conductivity and high mechanical strength, and can be widely applied to composite materials, conductive agents, heat conduction agents and mechanical enhancers, etc.

The invention relates to oilfield workover equipment, in particular to a wellhead lifting-clamping device used on an oilfield workover manipulator. The device comprises a shell, two sets of push rods, a claw and a positioning hook, wherein the claw which can be reset is hinged on the shell; a claw slider is arranged on the claw; the positioning hook which can be reset is hinged on the shell and is positioned above the claw slider; and the two sets of push rods are arranged on the shell outside the claw and the positioning hook respectively. The self of the device carries no power source and needs to be turned on and off through the cooperation of an elevator-unlocking device and an elevator-locking device outside, thereby greatly simplifying the structure of the lifting-clamping device, canceling a long gas pipe which is arranged on a pneumatic elevator and moves together with the elevator, reducing accident potential and helping to the safe production of oilfield. As the two sets of push rods are arranged on two sides, the elevator can be automatically unlocked and locked under the push of the elevator-unlocking device and the elevator-locking device outside. Through the fast replacement of claw clamp-heads with different specifications, the wellhead lifting-clamping device can lift up and put down oil pipes different in pipe diameter and oil-pumping rods different in size.

The invention provides a method for extracting and purifying procyanidine from waste grape seeds and discloses a process route with simpler and reasonable effects and low cost. The method comprises the following steps: carrying out water-bath reflux extraction on grape seed powder by using a solvent containing 50% alcohol and 4% citric acid at a ratio of (3:1)-(5:1) at a material-liquid ratio of (1:6)-(1:9) (m/v, the mass-volume rate), cooling, filtering, then carrying out rotary evaporation, and recovering alcohol; using the alcohol for alcohol precipitation, filtering alcohol-precipitation liquid, then concentrating, recovering alcohol, adding distilled water and uniformly mixing; extracting with normal butanol, combining extraction liquid, and cleaning the extraction liquid with saturated salt water; and carrying out rotary concentration and drying on the extraction liquid, and recovering normal butanol, thereby obtaining purpurin powder. The method provided by the invention has the following advantages that waste grape seeds in the wine brewing process are adopted as raw materials, so that not only are the wastes reasonably reutilized, but also the cost is low and the implementation benefit is obvious; alcohol is utilized for extraction, and normal butanol is utilized for extraction treatment, so that the production safety is good; alcohol and normal butanol are recovered, and are recycled, so that the cost is reduced; the product is high in purity and good in yield; and the process is simple and the industrialization is easy.

The invention relates to a synthesis method of hydroquinone. The method is characterized by comprising the following steps: carrying out catalytic oxidation on phenol and oxygen to generate a mixture of p-benzoquinone and o-benzoquinone, wherein a catalyst is copper and sodium complex salt; distilling to remove solvent, adding water in residual materials, and separating p-benzoquinone and o-benzoquinone by distillation; reducing separated p-benzoquinone with a reducing agent to obtain hydroquinone, filtering out hydroquinone crude product and recrystallizing so as to obtain hydroquinone crystal; and concentrating a mother liquid obtained by filtering out hydroquinone or catechol crude product to obtain an ammonium sulfate fertilizer. The synthesis method has simple process, mild reaction conditions and short reaction period, and the yield of hydroquinone in the product is larger than that of catechol.

The invention discloses a feeding device of a laser cutting machine, which comprises a main body of a laser machine, a first conveying frame and a second conveying frame. The conveyor frames are respectively installed on both sides of the main body of the laser machine, the positions of the first conveyor frame and the second conveyor frame are perpendicular to each other, and the front ends of the first conveyor frame and the second conveyor frame are fixedly installed with a feeding platform, and Both sides of the first conveyor frame and the second conveyor frame are fixedly equipped with guide frames, the inner cavity of the guide frame is equipped with a conveying guide rail, and the outer side of the guide frame is fixedly equipped with a drive motor, and the drive motor and the conveyor guide rail are fixedly installed. Rotationally connected, the inner side of the guide frame is fixedly installed with a support frame, and the upper ends of the first conveying frame and the second conveying frame are both provided with feeding carts. The feeding device of the laser cutting machine has a reasonable design, is convenient to use, has more practical value, and has a promoting effect on production safety and production efficiency.

An additive for the culture medium of photosynthesizing bacteria contains sodium propionate and iron ion salt (10-100 PPM). Its advantages are high reproduction speed, low cost, and friendly to ecological environment.