10results about How to "Avoid inhomogeneity" patented technology

The application belongs to the technical field of laser additive manufacturing, and particularly relates to an array type laser additive manufacturing method and device, which comprises the following steps: S1, digital model import and layering slicing; S2, scanning path planning and filling setting; S3, array type laser synchronous output control; S4, powder flow and powder feeding path control; S5, according to the width of the additive, the width of single track cladding is adjusted in real time; S6, according to the slice layer material of the additive, the matching material is delivered; S7, S1-S6 are repeated, and layer-by-layer accumulation is performed until the part manufacturing is completed. The application can accurately control the grain size, improve the material microstructure, and improve the mechanical properties; the generation of defects such as thermal cracks and pores is reduced, the stability of the deposition process is ensured; the interlayer bonding is optimized, the quality of multi-layer deposition is ensured; the residual stress is reduced, the size precision, shape stability and fatigue performance of the part are improved; the post-processing requirement is reduced, and the processing cost is reduced.

This utility model relates to a lubrication device for a down-the-hole drill hoisting system, belonging to the field of mining equipment technology in the metallurgical industry. The technical solution is as follows: the bottom sprocket (7) and the top sprocket (9) are respectively fixed on the drill frame (12), and the bottom sprocket (7) and the top sprocket (9) are connected by a hoisting chain (6). The pressure sprocket (3) cooperates with the hoisting chain (6). The lubricating oil tank (1) is located above the pressure sprocket (3). The upper end of the oil dripping pipe (15) is connected to the bottom of the lubricating oil tank (1), and the lower end of the oil dripping pipe (15) faces the pressure sprocket (3). One end of the high-pressure air pipe (5) is connected to the air compressor (17), and the other end of the high-pressure air pipe (5) faces the bottom sprocket (7). An adjusting valve (2) is installed on the oil dripping pipe (15), and an air pipe valve (8) is installed on the high-pressure air pipe (5). The beneficial effects of this utility model are: ensuring the lubrication of the hoisting chain, and using high-pressure airflow to remove mineral powder on the sprocket and chain, avoiding grease splashing.

The utility model discloses a garden plant breeding device which comprises a shell, a material storage barrel used for storing seed materials is rotatably installed in the shell, a plug is inserted in the material storage barrel, the lower end of the plug is connected with a push rod, and the lower end of the push rod is connected with a plug matched with an outlet in the lower end of the material storage barrel. The bottom of the plug and the top of the shell are rotationally connected with an elastic piece, and the plug is connected with a driving unit; through the design of the push rod and the plug inside the material storage barrel, seeds can be pushed out of the material storage barrel and planted into soil under the control of the driving motor, so that low efficiency and non-uniformity of manual seeding are avoided; meanwhile, due to the conical design of the plug, the seeds can smoothly pass through the outlet and enter the soil, the seeding efficiency and precision are improved, in addition, the device can automatically reset after seeding through the auxiliary effect of the elastic piece, the operation process is further simplified, and the labor intensity of workers is remarkably reduced.

This invention relates to the field of preparation method technology and discloses a method for preparing a low-density nylon foam material. The method includes selecting nylon resin as the matrix material, wherein the nylon resin is a blend of PA6 and amorphous nylon PA610 in a specific ratio, wherein the mass ratio of PA6 to PA610 is 60:40 to 80:20, and the melt strength of the nylon resin is greater than or equal to 18 Pa·s; introducing a composite foaming agent, wherein the composite foaming agent is a combination of a chemical foaming agent and a physical foaming agent; and adding a nucleating agent, wherein the nucleating agent is nano-sized silica, nano-clay, talc, or a combination thereof, wherein the mass content of nano-silica is 0.5% to 2.0%. This invention can maintain stable dimensions and mechanical properties in humid environments and has a uniform and stable cell structure.

The utility model relates to the technical field of stop valve discloses a kind of stop valve to prevent valve flap rotation, comprising: valve body, valve flap and valve flap cover;Valve body is opened with the valve cavity for flowing medium, valve seat is installed in valve cavity, valve cover is installed on valve body;Valve stem is installed in valve cover;Valve stem is installed in valve cavity, valve flap is connected with valve stem, valve flap is driven to adhere or away from valve seat by valve stem to cut off or communicate valve cavity;One end of valve flap structure is fixedly connected with valve flap, other end is fixedly connected with valve stem.This structure prevents the unevenness of medium flow, drives valve flap to rotate, increases the wear of valve flap cover to valve stem.When high-speed or turbulent medium passes through valve, the risk that the traditional valve flap may rotate due to uneven impact of medium, leading to wear or sealing failure is eliminated.And by prohibiting rotation, significantly reduce the mechanical wear of valve stem, valve flap cover and valve flap, prolong the life of valve.

The invention discloses a flexible PET-based copolyester and a preparation method thereof, and relates to the technical field of high polymer materials, and the flexible PET-based copolyester is prepared from dibasic acid and dihydric alcohol through esterification and condensation polymerization; the binary acid comprises aliphatic flexible binary acid and terephthalic acid; the dihydric alcohol comprises ethylene glycol and flexible dihydric alcohol; the flexible dihydric alcohol comprises diethylene glycol and polyethylene glycol; the feeding amount of the diethylene glycol accounts for 1.0%-5.0% of the total molar weight of the dihydric alcohol; the feeding amount of the polyethylene glycol accounts for 3.0%-8.0% of the total molar weight of the dihydric alcohol. The copolyester has the advantages of high flexibility and low melting point.

The application belongs to the technical field of short tube machine, and discloses a short tube machine and a using method thereof. The short tube machine comprises a machine body, a machining table arranged on the machine body, and a hydraulic flaring device arranged on the machining table. The hydraulic flaring device comprises a die, a fixed welding plate, a flaring and discharging mechanism, a first fixed plate, a pressing plate, an extension rod, a pressing oil cylinder, a second fixed plate and an adjusting mechanism. The die is fixedly installed at the bottom of the fixed welding plate, and the die and the fixed welding plate are located at the top of the machining table. Through the action of the second fixed plate and the clamping block, the pipe material is fully pressed, the pressing force of the pressing plate is prevented from being insufficient and uneven, and meanwhile, the top of the pipe material is polished by the polishing block to remove burrs and uneven parts on the top of the pipe material. The waste is collected in the collecting box, the pressing plate and the second fixed plate cannot press the pipe material, the pipe material is prevented from being loose, displaced and deformed during the machining process, and the machining precision is affected.

This utility model relates to a medical protective panel laminating machine, including a frame. The frame is sequentially equipped with a feeding conveyor, a laminating assembly, and an unloading conveyor, and also includes an upper laminating main roller, a lower laminating main roller, a cutting assembly, and a feed correction assembly. Through this structure, the entire process can be automated, achieving a high degree of automation, significantly improving production efficiency, reducing manual operation, and ensuring high cutting and laminating precision. Precise control of the pressure rollers and molding rollers ensures that the film layer is uniform and tightly adhered to the protective panel surface. It also exhibits strong adaptability; the feed correction assembly can be adjusted according to protective panels of different sizes, providing strong adaptability and flexibility. Furthermore, the equipped air shaft assembly and automatic correction function improve film tension and alignment accuracy, effectively avoiding uneven film layering and waste.

The application relates to the technical field of performance regulation of recycled concrete, and relates to a recycled concrete performance regulation method and system based on aggregate gradation optimization, which comprises the following steps: confirming a recycled concrete performance regulation environment based on a recycled concrete performance regulation instruction, pretreating engineering slag soil by using an aggregate pretreatment unit, grading the coarse aggregate sand and the fine aggregate sand based on an aggregate gradation optimization unit, pouring recycled lightweight aggregate concrete mixture by using a curing control unit, detecting the compressive strength, apparent density and thermal conductivity of the recycled concrete test piece by using a performance evaluation and regulation unit, and comparing and analyzing the actually measured performance index set with the preset target performance index set, so that the recycled concrete performance regulation of the engineering slag soil is realized based on the regulated recycled concrete. The application can improve the accuracy, efficiency, resource utilization rate and engineering applicability of the recycled concrete performance regulation.

This utility model discloses an automated track-type silkworm feeding device, belonging to the technical field of silkworm cocoon farming equipment. It includes a leaf-feeding cart, a leaf-feeding cart frame, a leaf-feeding track, and an automatic leaf-feeding mechanism. The leaf-feeding track comprises two parallel, spaced-apart first tracks. The leaf-feeding cart frame is perpendicular to the two first tracks and moves along the first tracks via first traveling wheels to reciprocate. A second track, perpendicular to the two first tracks, is located on the top of the leaf-feeding cart frame. The leaf-feeding cart moves along the second track via second traveling wheels to reciprocate between the two first tracks. The leaf-feeding cart has a leaf-feeding box with an open top, and a leaf-discharging mechanism at the bottom of the box. The automatic leaf-feeding mechanism is located on one side of one end of one of the first tracks and includes a leaf storage hopper and a mulberry leaf conveying mechanism. One end of the mulberry leaf conveying mechanism is installed at the bottom inner side of the leaf storage hopper. This utility model replaces manual leaf spreading, improves silkworm feeding efficiency, and avoids harming silkworms.