Climbing risk prevention CT polarity test method

The invention relates to the technical field of substation maintenance, in particular to an anti-climbing risk CT polarity test method, which comprises a CT polarity tester, and a PCB control board in the CT polarity tester comprises a touch display module, a controller, a charging circuit, a change-over switch, a discharging circuit, an energy storage capacitor, a polarity detection circuit and a mutual inductor. And a P1 end, a P2 end, an S1 end and an S2 end are sequentially arranged on one side of the CT polarity tester from top to bottom. The CT polarity test size and weight can be greatly reduced, field use is facilitated, the working efficiency is improved, a realization method for testing the CY polarity through a current pulse signal smaller than 1A is adopted, a pulse current signal is input at the P1 end of the CT, the pulse current signal obtained through S1 and S2 is output, the millisecond-level fast and slow characteristic is achieved, and the CY polarity test precision is ...

Nitroimiazoles colon target medicine and its preparing process

A nitroimidazole medicine whose target is colon is disclosed, which features that it is not released and desintegrated in upper digestive track and is only desintegrated and released at colon position, resulting in less stimulation to upper digestive tract and high curative effect.

Medicine containing drachonis and its preparation method

A Chinese medicine in the form of capsule, tablet, buccal lozenge, ointment, cream, or face mask for treating colonorrrhagia features that it contains Dragon's blood. Its preparation method is also disclosed.

Hypersonic flame spraying process for self-lubricating wear-resistant coating

The invention relates to a hypersonic flame spraying process for a self-lubricating wear-resistant coating, which comprises the following steps of: preparing a workpiece to be sprayed, removing oil stain with acetone, then carrying out white alundum blowing treatment, and finally carrying out hypersonic flame spraying, wherein the surface of the workpiece to be sprayed after being blown needs to be uniform, rough and free of metallic luster; and after blowing and roughening, spraying a coating of which the thickness is 300-400mum on the workpiece to be sprayed. The process comprises the following concrete conditions that: the spraying distance is 340-360mm, the powder feeding rate is 30-40g/min, the oxygen flow is 1750-1800l/h, the oxygen pressure is 131+/-10 psi, the kerosene flow is 5.3-5.5 g/hr, and the kerosene pressure is 113+/-15 psi. The invention has the advantages that by using hypersonic flame to spray chromium carbide/nickel-chromium powder containing fluoride, a high-temperature ...

Implementation method of high-voltage arbitrary waveform generator

The invention relates to the technical field of voltage generators, in particular to an implementation method of a high-voltage arbitrary waveform generator. A front-and-back stage amplification mode is adopted, a front stage adopts a linear power amplification mode, and a back stage adopts an IGBT series connection mode of a digital power amplifier to jointly realize amplification output of any waveform high voltage. According to the design of the invention, by constructing a test system composed of an upper computer, a signal generation system, a positive and negative signal transmission isolation module, a positive and negative signal amplification module, an IGBT series module and a positive and negative power supply module, any voltage output can be realized; high voltage and control signals are isolated to ensure that the control signals are not interfered; due to the front-and-back stage amplification design, the front stage ensures the amplification output of any waveform, and the ...

Method for preparing seal coating by plasma spraying

The invention discloses a method for preparing a seal coating by plasma spraying. Al/BN alloy powder and NiAlW alloy powder are used as raw materials, and the coating is prepared by adopting a plasma spraying mode, wherein the Al/BN alloy powder is used as a surface material and comprises the following components in percentage by mass: 18.0 to 25.0 percent of BN, 4.0 to 8.0 percent of SiO2 and the balance of Al; and the NiAlW alloy powder is used as a bottom material and comprises the following components in percentage by mass: 20.0 to 24.0 percent of Al, 1.5 to 4.0 percent of Cr, less than or equal to 2.0 percent of W, 0.2 to 1.2 percent of Co, 0.2 to 1.2 percent of Mo, 0.2 to 1.0 percent of Ti and the balance of Ni. The coating plays a low-temperature sealing role, and the design point temperature is about 400 DEG C. The method fills the technical blank, and has obvious good technical effect.

Method for preparing antioxidant coating of combustion liner of aeroengine

The invention discloses a method for preparing an antioxidant coating of a combustion liner of an aeroengine, which is characterized by utilizing Al2O3.NiAlW flexible wires and NiAlW flexible wires as raw materials to undergo flame spraying, wherein the Al2O3.NiAlW flexible wires comprise the following components: 29-34% of Ni, 9-14% of Al, 0.9-2.5% of Cr, less than or equal to 1.0% of W, 0.1-0.6% of Mo, 0.1-0.5% of Ti, 0.1-0.6% of Co, 38-54% of ruby and the balance molding agents; and the NiAlW flexible wires comprise the following components: 61.0-67.0% of Ni, 18.0-22.5% of Al, 2.0-4.0% of Cr, less than or equal to 2.0% of W, 0.2-1.2% of Mo, 0.2-1.0% of Ti, 0.2-1.2% of Co and the balance molding agents. The coating prepared by the method has simple and feasible spraying process and highproduction efficiency, and the method can be widely used for preparing the antioxidant coatings on the surfaces of various parts of various types of engines, wherein the long-term working temperatureof ...

Hypoeutectic high-chromium white cast iron roller and preparation method thereof

The invention provides a hypoeutectic high-chromium white cast iron roller and a preparation method thereof. The roller is characterized by comprising a roller sleeve and a mandrel. The roller sleeve is composed of a roller body made of hypoeutectic high-chromium white cast iron and a seamless steel pipe lining, wherein the roller body comprises the following chemical components by mass: C 2.1 to 2.4%, Si 0.5 to 0.8%, Mn 0.3 to 0.5%, Cr 21 to 23%, Mo 1.2 to 1.5%, Ni 1.5 to 1.8%, B 0.3 to 0.6%, Ti 0.1 to 0.2%, W 0.2 to 0.3%, Nb 0.1 to 0.2%, V 0.2 to 0.3%, yttrium-based rare earth 0.3 to 0.5%, S <= 0.03% and P <= 0.03%, with the balance being Fe. The hypoeutectic high-chromium white cast iron roller provided by the invention has the advantages of good heat crack resistance, small hardness drop, good toughness and good wear resistance, and the rolling capacity of the roller is improved by 3 to 4 times compared with the rolling capacity of a centrifugal bainite composite roller.

Method for preparing seal coating by plasma spraying

Hypersonic flame spraying process for self-lubricating wear-resistant coating

The invention relates to a hypersonic flame spraying process for a self-lubricating wear-resistant coating, which comprises the following steps of: preparing a workpiece to be sprayed, removing oil stain with acetone, then carrying out white alundum blowing treatment, and finally carrying out hypersonic flame spraying, wherein the surface of the workpiece to be sprayed after being blown needs to be uniform, rough and free of metallic luster; and after blowing and roughening, spraying a coating of which the thickness is 300-400mum on the workpiece to be sprayed. The process comprises the following concrete conditions that: the spraying distance is 340-360mm, the powder feeding rate is 30-40g/min, the oxygen flow is 1750-1800l/h, the oxygen pressure is 131+/-10 psi, the kerosene flow is 5.3-5.5 g/hr, and the kerosene pressure is 113+/-15 psi. The invention has the advantages that by using hypersonic flame to spray chromium carbide/nickel-chromium powder containing fluoride, a high-temperature ...

Method for preparing antioxidant coating of combustion liner of aeroengine

The invention discloses a method for preparing an antioxidant coating of a combustion liner of an aeroengine, which is characterized by utilizing Al2O3.NiAlW flexible wires and NiAlW flexible wires as raw materials to undergo flame spraying, wherein the Al2O3.NiAlW flexible wires comprise the following components: 29-34% of Ni, 9-14% of Al, 0.9-2.5% of Cr, less than or equal to 1.0% of W, 0.1-0.6% of Mo, 0.1-0.5% of Ti, 0.1-0.6% of Co, 38-54% of ruby and the balance molding agents; and the NiAlW flexible wires comprise the following components: 61.0-67.0% of Ni, 18.0-22.5% of Al, 2.0-4.0% of Cr, less than or equal to 2.0% of W, 0.2-1.2% of Mo, 0.2-1.0% of Ti, 0.2-1.2% of Co and the balance molding agents. The coating prepared by the method has simple and feasible spraying process and high production efficiency, and the method can be widely used for preparing the antioxidant coatings on the surfaces of various parts of various types of engines, wherein the long-term working temperature of ...

Centrifugation composite roll casting cold mould end cover

The utility model provides a centrifugation composite roll casting cold mould end cover, belongs to centrifugal cast technical field, and it is including joining in marriage dress two parts in the opening of casting cold mould both ends, and wherein each part all sets up the inner end cap and outer end cover of mutual matching, inner end cap comprises inner end cap supporter and inner end cap sand mould, the inner end cap supporter is the annular structure, molding inner end cap sand mould in inner end cap supporter inner chamber, and the interior port of inner end cap sand mould matees with the operational layer terminal surface pilot taper facial features of centrifugal composite roll, outer end cover comprises outer end cover supporter and outer end cover sand mould, outer end cover supporter is the annular structure, the outer end cover sand mould of molding in the end cover supporter inner chamber outside, the interior port of outer end cover sand mould and the roller core pilot taper ...

Aeroengine combustor liner with surface coated with oxidation resistant coating

The invention provides an aeroengine combustor liner with surface coated with an oxidation resistant coating. The coating is specifically subjected to flame spraying by using Al2O3.NiAlW flexible wires as the surface layer materials and NiAlW flexible wires as the bottom layer materials. The Al2O3.NiAlW flexible wires are prepared by the following components in percentage by mass: 29-34% of Ni, 9-14% of Al, 0.9-2.5% of Cr, not more than 1.0% of W, 0.1-0.6% of Mo, 0.1-0.5% of Ti, 0.1-0.6% of Co, 38-54% of ruby and the balance of forming agents. The NiAlW flexible wires are prepared by the following components in percentage by mass: 61.0-67.0% of Ni, 18.0-22.5% of Al, 2.0-4.0% of Cr, not more than 2.0% of W, 0.2-1.2% of Mo, 0.2-1.0% of Ti, 0.2-1.2% of Co and the balance of forming agents. The spraying technology of the coating is simple and feasible and high in production efficiency and can be widely applied to preparation of the oxidation resistant coatings on the surfaces of various parts ...

Transformer substation framework lightning rod anti-vibration structure

The utility model discloses an anti-vibration structure of a lightning rod of a transformer substation framework. The problem that in the prior art, a lightning rod is prone to breeze resonance is solved. The vibration frequency of the lightning rod can be changed; according to the scheme, the anti-vibration structure of the lightning rod of the transformer substation framework is arranged at thetop end of a transformer substation framework column, the lightning rod structure is a tubular part, a damper is arranged in the tubular part and arranged in the length direction of the tubular part,and the two ends of the damper are connected with the tubular part.

Aeroengine combustor liner with surface coated with oxidation resistant coating

The invention provides an aeroengine combustor liner with surface coated with an oxidation resistant coating. The coating is specifically subjected to flame spraying by using Al2O3.NiAlW flexible wires as the surface layer materials and NiAlW flexible wires as the bottom layer materials. The Al2O3.NiAlW flexible wires are prepared by the following components in percentage by mass: 29-34% of Ni, 9-14% of Al, 0.9-2.5% of Cr, not more than 1.0% of W, 0.1-0.6% of Mo, 0.1-0.5% of Ti, 0.1-0.6% of Co, 38-54% of ruby and the balance of forming agents. The NiAlW flexible wires are prepared by the following components in percentage by mass: 61.0-67.0% of Ni, 18.0-22.5% of Al, 2.0-4.0% of Cr, not more than 2.0% of W, 0.2-1.2% of Mo, 0.2-1.0% of Ti, 0.2-1.2% of Co and the balance of forming agents. The spraying technology of the coating is simple and feasible and high in production efficiency and can be widely applied to preparation of the oxidation resistant coatings on the surfaces of various parts ...

Nitroimiazoles colon target medicine and its preparing process

Process method for repairing small-size by explosion spraying of nickel chrome alloy

The invention relates to a process method for repairing a small-size by explosion spraying of a nickel chrome alloy, which is characterized in that: the process flow comprises the following steps: surface cleaning of workpieces, area protection of non-sprayed areas, area protection of the non-sprayed areas, workpiece sand blasting and workpiece spraying. The workpiece spraying adopts nickel chrome alloy powder, wherein the nickel chrome alloy powder contains 15.0 to 25.0 percent of Cr; the powder size is between 45 and 150 mu m; the powder liquidity is less than 40s/50g; and the powder apparent density is larger than 2.4 g/cm3. The workpiece spraying adopts an explosion spraying way, adopts oxygen and acetylene as burning gases and adopts nitrogen as a stopping gas and a powder transporting gas, wherein the ratio of the oxygen to the acetylene gas is 1.2 to 1.5:1; and the spraying distance is between 170 and 180mm. The process method can be widely used for repairing sizes of nickel base ...