53results about How to "Deep stability" patented technology

Belonging to the technical field of refractory materials, the invention relates to taphole stemming used for oversize blast furnaces over 4500m<3>. The taphole stemming used for oversize blast furnaces comprises by weight: 25-50% of brown corundum, 5-20% of silicon carbide, 7-25% of ferro-silicon nitride, 15-30% of a composite carbon material, 5-15% of kaolin, 3-7% of composite refractory material micropowder, and 1-5% of composite metal powder. The stemming is prepared by the steps of: conducting weighing and burdening according to the above ratio of various raw materials, mixing them well and adding a coal tar binder accounting for 15-25% of the total weight of the additionally added dry materials, then conducting rolling and mulling so as to obtain a mud material. The stemming of the invention has good comprehensive performance, stable taphole depth, long tapping time, good erosion and scouring resistance, as well as good construction performance.

The invention relates to a method for producing large-sized zirconium ingot with the specification Phi of more than 600mm, and the technical characteristics lie in that a consumable electrode with relatively uniform components is prepared by adopting dosing, mixing and vacuum plasma arc electrode assembly and welding technology, and vacuum consumable electric arc melting is carried out for at least twice by adopting technology of 'speed reducing melting' and 'component uniformity controlling' and the like under the conditions that the melting speed control parameter is 10-40kg/min and the arc stability control is carried out with the magnetic induction of 10-50 Gauss and the stable arc current alternate control time of 1-60 seconds. Compared with the prior art, the invention has the advantages that the large-sized zirconium ingot produced by the invention has uniform and stable chemical components and excellent ingot surface quality, is better than small ingot melted by vacuum consumable electric arc, and has the advantages of high yield, high production efficiency and being easy for producing large zirconium material and the like; and the invention is applicable to producing ingots for large zirconium material.

The invention relates to an anhydrous stemming for a blast furnace. The anhydrous stemming is prepared from the following raw materials in percentages by weight: 30-40 percent of high-alumina bauxite, 10-15 percent of high-purity silicon carbide, 20-25 percent of soft clay, 10-25 percent of carbonaceous material, 5-15 percent of submicron powder, 15-25 percent of binding agent, and additionally silicon metal powder addictives accounting for 1-3 percent of the total weight of the raw materials. The anhydrous stemming has the advantages of favorable high-temperature fire performance, linearity change ratio of lower than 0.3 percent under the condition of 1400 DEG C*2h, breaking strength of more than or equal to 10MPa, high intensity, slag-iron resistant scouring, easy sintering, excellent work performance, less pollution and low production cost, and is beneficial to environment protection as well as popularization and application.

A method for double sampling loop negative feedback comprising: obtaining a low-frequency feedback signal from the output of the amplifier; obtaining a high-frequency feedback signal from part of the amplifier of which high-frequency phase shift is low, wherein two-ways sampling signals have the same amplifying phase; combining the two-ways sampling signals together using a series capacitor-inductor double signal combining circuit to form one signal, the signal having low phase shift at both high and low-frequency and being used for negative loop feedback. The invention also provides a double negative feedback amplifier using the method.

The invention provides a control method based on an underwater floating and sinking device. The method comprises the steps of depth value initializing: defining the depth value range and defining the absolute depth 0 value; depth value setting: setting the preset depth value; speed value setting: setting the preset floating speed, the preset sinking speed and the preset suspending speed; depth detection: detecting the current position depth value of the underwater floating and sinking device; depth comparison: comparing the current position depth with the preset depth value; speed detection: detecting the current floating or sinking or suspending speed of the underwater floating and sinking device; speed comparison: comparing the current speed with the preset floating speed, the preset sinking speed and the preset suspending speed. The control method has the advantages that the fast floating, the fast diving and the suspending at the set speed of a bionic robot in water are realized; the response speed of the control method is high; the flexibility is good; the depth is kept stable.

The invention relates to the technical field of ferrous metallurgy, in particular to a smelting method for medium coke used in a large bell-less blast furnace in a high proportion. According to the smelting method, medium coke is prevented from being distributed into the center of the blast furnace by a small coke distribution method, a damping-down material improving structure is proposed after a large amount of medium coke is used, and central airflow development and rapid recovery are guided by adopting a load sharing and central tank coke adding method; a proper edge load increasing and large batch weight smelting method is provided to inhibit edge airflow development; and a stokehole tapping structure is enhanced, the clay ramming amount is standardized, the iron notch depth is stabilized, and the effective tapping time is guaranteed. These measures are adopted when the medium coke used in the high proportion is produced, so that the medium coke can be successfully prevented from being distributed into the center of the blast furnace to influence the quality of furnace core coke under the condition of not reducing coke load, rapid recovery after damping down of the blast furnace is guaranteed, edge coal airflow can be stabilized and the central airflow can be developed in daily operation, a hearth is facilitated to be active, and long-term stable smooth operation of the blast furnace is ensured.

The invention relates to a hydraulic control self-propelled road surface cutter which comprises a frame, an engine, a cutting device, a walking device and a support device, wherein the cutting device, the walking device and the support device are fixedly mounted on the frame; the cutting device is provided with a blade; the walking device is provided with a drive wheel, a transmission mechanism and a walking control mechanism; the support device is provided with a small chassis, a front walking wheel, a scale pointer flange and a hydraulic oil cylinder; the hydraulic control self-propelled road surface cutter is also provided with a hydraulic control device; and the hydraulic control device is provided with a support hydraulic pump, a support overflow valve, a support system, a walking hydraulic pump, a walking overflow valve and a walking system. The hydraulic control self-propelled road surface cutter provided by the invention adopts an infinitely variable speed hydraulic driver to realize self propelling, has the advantages of simple and compact structure and good working stability, is convenient to use, realizes convenient control on the cutting depth and operation speed, can visually display the cutting depth, is suitable for cutting various road surfaces and can improve the working environment.

The invention discloses a corrugating device for a steel strip and an aluminum strip. The corrugating device comprises a corrugating rack, a driving mechanism and an electric control system, wherein a sliding block, an upper roller and a lower roller are arranged in the corrugating rack; the sliding block is arranged at the upper half part of the corrugating rack; the lower roller is arranged at the lower half part of the corrugating rack; the upper roller is fixedly arranged on the sliding block; a screw hole is formed in the middle of the upper part of the sliding block; a spring is arranged in the screw hole; an adjusting screw is also arranged in the screw hole; the driving mechanism comprises a three-phase alternating current motor, a speed reducer, a chain type driving belt and a swing arm; the electric control system comprises an angle sensor and a frequency converter; the speed reducer is connected with the lower roller through the chain type driving belt; the three-phase alternating current motor is connected with the speed reducer; an electrical output end of the frequency converter is connected with a power supply end of the three-phase alternating current motor; the angle sensor is connected with a control end of the frequency converter through a lead and is connected with a guide wheel through the swing arm. According to the corrugating device disclosed by the invention, the synchronization of the corrugating speed and a production line can be ensured, the corrugating depth can be regulated and stable corrugating speed is maintained.

The invention discloses a martensitic stainless steel rod for an automobile turbocharger rivet and belongs to the technical field of stainless steel rods. The martensitic stainless steel rod comprisesthe following chemical elements in percentage by mass: 0.12-0.22% of C, less than or equal to 1.00% of Si, less than or equal to 1.50% of Mn, less than or equal to 0.04% of P, less than or equal to 0.03% of S, 15.00-17.00% of Cr, 1.50-2.50% of Ni, 0.01-0.30% of N, 0.0001-0.0010% of B and the balance of Fe and inevitable impurities. The martensitic stainless steel rod has the advantages that deltaferrite caused in surface sensitive quenching of an automobile turbocharger rivet can be avoided, the problems of large rivet surface sensitive quenching hardness and hardening layer depth fluctuation and low pass percentages in the prior art can be solved, and the rivet sensitive quenching property pass percentage can be up to 98% or greater.

The invention discloses slotting equipment for additionally arranging dowel bars at joints of cement concrete pavement plates. The slotting equipment controls an arc-shaped supporting arm to match with a supporting bar to act through stretching out and drawing back of a hydraulic oil cylinder piston rod so that a slotting and cutting device can be driven to rotate, and adjusting of the slotting depth is achieved. The slotting equipment is clear in principle, simple in structure, convenient to operate and capable of saving time and effort, precisely controlling the position, size, distance and depth of slotting and slotting a plurality of slots at the same time; and compared with manual slotting, the slotting equipment has the characteristics of being high in efficiency, capable of reducing manufacturing cost, convenient to operate and the like.

The invention discloses a ridge height self-adaption seedling digging planting machine. The ridge height self-adaption seedling digging planting machine comprises a ridge height sensor, a digging plough, a rear wheel, a planting part, an operation handrail, a seedling releasing device, a seedling planting gearbox, a connecting rod mechanism, a seedling storage rack, a hydraulic system, a walking gearbox, an engine, a rack and a front wheel, wherein the ridge height sensor is arranged below the rack; the seedling planting gearbox, the walking gearbox and the engine are arranged on the rack; the front wheel is arranged at the front end of the rack; an output shaft of the engine is connected to an input shaft of the walking gearbox; the walking gearbox is provided with three output shafts; the seedling storage rack is arranged at the top of the machine; the seedling planting gearbox is provided with three output shafts; the operation handrail is fixed on the rack; and various control switches are arranged on the operation handrail. The ridge height self-adaption seedling digging planting machine has the advantages of simultaneous completion digging and planting, high degree of automation, stable seedling planting depth and good row spacing consistency.

The invention provides a grafting knife suitable for rootstock ends. The grafting knife suitable for rootstock ends comprises a positioning rod and a water seepage port, wherein a first cross arm anda second cross arm are rotatably connected to the outside of a bearing shaft jointly, a reset spring is fixedly connected to a portion between the first cross arm and the second cross arm on one side,and a water storage cavity is fixedly connected to the upper portion of the second cross arm on one side. The other side of the first cross arm is in contact with the lower edge of a push-type pump,the interior of a cutting knife and the interior of a pressure-bearing rod are hollow, and a guide pipe penetrates through the pressure-bearing rod and extends to the interior of the cutting knife. When the first cross arm and the second cross arm are stressed, the push-type pump can be pressurized, growth liquid in the water storage cavity can be pumped out by the push-type pump, and is guided into the cutting knife through the guide tube, the growth liquid is drained from the water seepage port, and along with cutting of the cutting knife, the growth liquid is just smeared inside the notch of a rootstock.

The invention discloses a girdling device based on agricultural planting maintenance and a using method of the girdling device, and belongs to the technical field of agricultural planting auxiliary devices. The girdling device based on the agricultural planting maintenance comprises a first fixing plate, a second fixing plate, a fixing assembly and a girdling assembly, wherein an air cylinder is connected between the first fixing plate and the second fixing plate; the fixing assembly is connected to the inner walls of the first fixing plate and the second fixing plate; a second supporting plate is slidably connected to the bottom wall of the fixing assembly; and the second supporting plate is connected with the girdling assembly through a connecting plate, a transmission assembly is connected to the bottom wall of the second supporting plate, a gear ring is arranged on the outer wall of the fixing assembly and connected with the output end of the transmission assembly, a material collecting barrel is further arranged at the bottom of the transmission box, and a crushing assembly is arranged in the material collecting barrel. The girdling device can effectively improve the stabilityperformance in the girdling process of fruit trees, improves the girdling effect of the fruit trees, can automatically rotate for girdling, reduces the labor intensity, and improves the girdling efficiency.

The invention discloses a technical formula of an additive for producing high-performance methanol gasoline. The technical formula of the additive for producing the high-performance methanol gasolinemainly comprises the following components by weight percentage: 20-30 percent of isobutanol, 0.1-2.5 percent of 2,4-di-tert-butyl-4 cresol, 25-40 percent of isoamylol, 8-16 percent of dioctyl phthalate, 3-10 percent of dioctanol, 0.05-0.1 percent of methylcyclopentadienyl manganese tricarbonyl, 1-3 percent of dicyclohexylammonium nitrite, 0.5-1.5 percent of glyceryl triacetate and 0.5-3 percent of mixture of aldehyde condensation compounds. The methanol gasoline prepared by the additive has the advantages that methanol and gasoline can be stably and mutually soluble, rubber and metal parts of an automobile are protected; cold start of the automobile is easily realized, the combustion of the gasoline is sufficient and the power of the automobile is enhanced.