34results about How to "Reduce the amount of cleaning" patented technology

The invention relates to a low-alloy high-strength steel plate for a big-thickness boiler drum and a manufacturing method of the low-alloy high-strength steel plate. The manufacturing method comprises the following steps: (1) carrying out smelting, external refining and vacuum degassing treatment on the following components in percentage by weight: 0.135-0.17% of C, 0.15-0.50% of Si, 1.20-1.60% of Mn, less than or equal to 0.010% of P, less than or equal to 0.002% of S, 0.10-0.30% of Cr, 0.10-0.30% of Mo, 0.40-0.70% of Ni, 0.008-0.018% of Nb, 0.020-0.040% of Al, less than or equal to 0.05% of Cu, less than or equal to 0.006% of N, less than or equal to 0.003% of O, less than or equal to 0.00018% of H, 0.004-0.010% of Ti and the balance of Fe and unavoidable impurities, wherein Ti / N is less than or equal to 2.74; (2) casting; (3) carrying out steel ingot and cogging; (4) carrying out steel plate rolling and finishing; (5) carrying out normalizing, wherein the normalizing temperature of the steel plate is 900-940 DEG C, the temperature maintaining time is not less than 30 minutes after a core part of the steel plate is heated to 900-940 DEG C; (6) carrying out accelerated cooling to guarantee the cooling speed of the core part of the steel plate to be not less than 1 DEG C / second; (7) tempering at the temperature of 640-690 DEG C, and carrying out air cooling until reaching the room temperature after the steel plate is discharged out of a furnace.

The invention provides a production method of stainless steel composite plates. The production method comprises the steps that caulking grooves are dug in the middles of two carbon steel base blanks according to the size of stainless steel plates, and slots and exhaust chambers communicating with the slots are formed in the two ends of each caulking groove separately; the two stainless steel plates are embedded into the caulking grooves of the two base blanks in the mode that the surfaces where an isolating agent is spread face upwards, and the two base blanks are buckled together to form a composite blank; the composite blank is put into a vacuum chamber to be vacuumized, spot welding is conducted first and then continuous welding is conducted, vacuum breaking and cooling are conducted, and an anti-oxidation coating is sprayed on the surface; heating and heat preserving are conducted on the cooled welded blank in a heating furnace, wherein the initial rolling temperature ranges from 1,000 DEG C to 1,150 DEG C, the accumulated reduction rate of the first three passes is higher than or equal to 35%, and the finish rolling temperature ranges from 930 DEG C to 1,050 DEG C; edges are cut after rolling, and then two stainless steel composite plates are obtained. According to the method, the condition that a magnetic deflective blow phenomenon occurs between stainless steel and carbon steel due to magnetic influence can be avoided, effective compositing between the stainless steel and the carbon steel is achieved, the surface clearing and grinding amount is decreased, and the yield of the composite plates is increased.

An irregular oblique-crossing web-shaped grillage beam hyperbolic roof structure construction method comprises the steps of construction preparing, secondary conversion of design drawing, lofting grillage beam ground projection axis measuring, steel pipe buckling piece all-round scaffold supporting system erecting, grillage beam bottom wood ridge lower support horizontal rod elevation giving off, wood ridge binding and bottom plate paving on a supporting horizontal rod, given-off roof beam position measuring, bound grillage beam steel rib machining, grillage beam grillage side mould mounting and reinforcing, grillage beam top plate mounting and reinforcing, face plate steel rib binding and hyperbolic roof concrete pouring. Through a space three-dimensional technology, a reasonable supporting system and accurate location of a hyperbolic roof and a grillage beam, the concrete mixing proportion is optimized, the quality and the attractive degree of the hyperbolic roof can be improved, construction difficulty is lowered, and construction efficiency is improved.

The invention relates to a belt conveyor. The belt conveyor comprises a rack and a conveying belt arranged on the rack, a partition plate is arranged on the portion, below the conveying belt, of the rack, the cross section of the upper end of the partition plate is arc-shaped, the middle of the partition plate is provided with a supporting portion which is supported by the conveying belt, an upper cover is arranged on the portion, above the partition plate, of the rack, a closed space is formed between the upper cover and the partition plate, and a conveying device used for material return is arranged on the portion, below the partition plate, of the rack. Due to the fact that the conveying belt is arranged in the closed space formed between the upper cover and the partition plate, the belt conveyor has the advantages of guaranteeing that materials will not fly upward and scatter when being used, preventing outer-wall impurities from being mixed with the conveyed materials, and avoiding the situation that the materials are damaged when being exposed to the sun and rain. Due to the fact that the conveying device used for material return and the conveying belt are arranged in a separated mode, the belt conveyor further has the advantages of preventing a large number of dust adhered to the conveying belt from accumulating on the inner side of a box body. The belt conveyor has the advantages of guaranteeing that the conveying belt will not shift due to the fact that the supporting portion is in contact with the conveying belt, improving production efficiency, and reducing the cleaning workload.

The invention discloses a casting blank longitudinal crack prediction method and device, and the method comprises the steps: obtaining at least three groups of temperature data of a target prediction position of a crystallizer copper plate, each group of temperature data at least comprises two temperature values, and each temperature value corresponds to different collection time; correspondingly obtaining time offset of adjacent groups and temperature deviation of each group according to the acquisition time and the temperature value of the temperature data; and if the temperature deviation and the time offset meet a preset condition, determining that the longitudinal crack exists in the target prediction position. According to the method, at least three groups of temperature data and acquisition time are acquired at the target prediction position of the casting blank, so that whether the concave morphology appears repeatedly at the target prediction position or not is determined, and the longitudinal crack exists at the target prediction position is determined after the temperature deviation and the time offset meet the preset conditions, so that accurate prediction of the longitudinal crack at the target prediction position is achieved.

The invention discloses a method for treating silt and quicksand foundations, which comprises the steps of: removing a certain height of silt and quicksand in untreated silt and quicksand foundations to form cleaned silt and quicksand layers; Aggregate is backfilled in the quicksand layer to the design elevation, and the aggregate hits the silt and quicksand layer and integrates with the silt and quicksand layer to form a treated silt and quicksand foundation. The present invention adopts partial removal of silt and quicksand in the foundation to form silt and quicksand layers, and then smashes and backfills the aggregate into the silt and quicksand layers to integrate the aggregates with the silt and quicksand layers, which not only reduces the The cleaning amount of silt and quicksand reduces the input of labor and materials, and can also use the characteristics of the silt and quicksand layer itself to increase the bonding performance between aggregates, form a firm and stable whole, and improve the sludge after treatment. Structural strength of quicksand foundation.

The invention discloses a method for controlling hypodermic bubble defects of a wide and thick slab of medium carbon steel. In the casting process, crystallizer protecting slag with alkalinity of 1.0-1.1 is used; the cooling strength of the bent section is controlled between 0.18-0.23 kg / L; the deformation is controlled to be 0.60 mm / m-0.70 mm / m under light pressure. A solid stopper rod is used, the argon blowing pressure of the middle ladle circular seam is 0.20-0.30 MPa, and the argon blowing flow is 2-4 L / min. According to the invention, the hypodermic bubble defects of the wide and thick slab of medium carbon steel can be effectively controlled, the cleaning amount of the casting blank in the later stage is reduced, the cleaning-free is achieved, meanwhile, the rejection rate of the rolled material is reduced, and the production cost is reduced; the system has the advantages of completeness and strong operability, can be rapidly popularized and promoted in production lines, and hasremarkable benefits.

A stage performance prop table belongs to the field of stage props and comprises a table body and legs. The legs are arranged at the bottom of the table body and fixedly connected with the table body,a left and a right end of the inner wall of the table body are provided with second slide grooves, the bottoms of the second sliding grooves are provided with limiting groove communicating with the second sliding grooves, a third desktop is installed in the table body, the left and right ends of the third desktop are fixedly installed with a second sliding block, the second sliding block is arranged in the second sliding groove and is slidably connected with the second sliding groove, and a spring is installed on the bottom surface of the third desktop. The prop can be arranged and taken backonly by pressing the desktop when in use, so that the prop table is more convenient to operate, reduces the setting of the number of prop tables, saves the storage space, has good dustproof effect and reduces the cleaning amount.

A device capable of improving the efficiency of laser selective melting forming, comprising a forming unit, a powder supply unit, a powder recovery unit, and a laser control unit; the forming unit is used to carry formed parts (3) and an unformed powder fastening layer (5) and unformed powder; the powder supply unit lays the powder according to the shape of the section of the in-plane forming part (3) to be formed; simultaneously forms the unformed powder fastening layer (5); the powder recovery unit is used to carry the unformed Formed powder: the laser control unit scans the powder in the surface to be formed according to the scanning path generated by the part cross-section information of the formed part (3), so that the laid powder is melted into a part of the formed part (3). The invention also includes a method for using the equipment that can improve the efficiency of laser selective melting and forming.

The invention belongs to a cleaning appliance and particularly relates to a household floor cleaning machine which is suitable for household use. The household floor cleaning machine is characterized by comprising a vehicle body, a towel box arranged at the bottom of the vehicle body, a transport component, a conveying and pushing part, a pushing component for pushing a towel transported by the transport component to the bottom of the vehicle body, and a dirty towel storage box for storing dirty towels, wherein the dirty towel storage box is provided with a dirty towel inlet and a dirty towel outlet, and a towel pushing outlet is formed in the position, corresponding to the lower part of the pushing component, at the bottom of the vehicle body. The cleaning machine cleans the ground by automatically transporting and pushing the towel, is in tight contact with the ground, has a good cleaning effect. The transport is convenient and smooth, and jamming is not likely to happen. The equipment cannot be easily damaged and is long in service life. The cleaning machine is simple in structure, low in cost, high in degree of automation and good in cleaning effect.

The invention relates to a method of manufacturing a brake drum by utilizing a metal-typed sand covering technique, comprising a die joint is determined by the maximum diameter position of the brake drum, a lower joint is determined by a large mouth part and an upper joint is determined by a small mouth part; an internal model and an external model are respectively arranged in order to ensure the internal profile dimension and the external profile dimension of the brake drum; an internal sand box and an external sand box are respectively arranged in order to manufacture the lower joint and the upper joint of the brake drum; after the internal model and the internal sand box, the external model and the external sand box are assembled according to prearranged clearances, the internal sand box and the external sand box are covered with sands through a sand injection hole; metal liquid is poured after the internal sand box and the external sand box with sand cover are tightly locked. The invention has the advantages of improving working environment, more precise dimension of the castings, better surface quality, higher yield, lower cost and higher production efficiency.