Monitoring system and monitoring method for state of cable outer sheath based on DigiMesh network

The invention relates to a monitoring system and monitoring method for the state of a cable outer sheath based on a DigiMesh network. The collection of the state information of an outer sheath of a power cable and a DigiMesh communication technology are combined, and data is transmitted back in a multi-hopping manner. According to the invention, a data collector measures the state data of the cable in real time, data transmission is performed through an internet of things, the system and the method disclosed by the invention have the characteristics of high efficiency, high reliability and ultra-low power consumption, at the same time, the system and the method have stronger capacity for withstanding disaster crisis communication, monitoring conditions can be timely transmitted to a central server which disposes data, and the state of the outer sheath of the cable is judged according to the disposed data. The system and the method have important and actual significance for timely inspecting ...

Cogging method for Ti2AlNb-based alloy ingot

The invention discloses a cogging method for a Ti2AlNb-based alloy ingot. The cogging method comprises the steps that the Ti2AlNb-based alloy ingot is loaded on a wire cutting machine and manufactured into a Phi290*280mm bar; the Ti2AlNb-based alloy ingot is sleeved with alumina silicate fibers, placed into a high-temperature heating furnace to be heated to 1150 DEG C and then placed on a press after the temperature is kept for 80 minutes, and repeated upsetting and drawing are performed at the strain rate of 0.01S-1; the ingot is drawn out to 350mm after first fire, upset to 350mm after second fire, drawn out to 350mm after third fire, upset to 270mm after fourth fire and drawn out to 350mm after fifth fire, and air cooling is performed. The ingot is returned to the furnace to be heated to 1150 DEG C and the temperature is kept for 40 minutes for each fire, and the final forging temperature of each fire is guaranteed to be equal to or larger than 1050 DEG C. According to the method, the ...

Low-power-consumption Radix-4 charge weight distributed type DAC and switching technology

The invention discloses a low-power-consumption Radix-4 charge weight distributed type DAC and switching technology. The low-power-consumption Radix-4 charge weight distributed type DAC comprises a capacitor array, reference voltage generators and a toggle switch controlled by digital signals for making the reference voltage generators connect or disconnect with capacitors; the weight express circuits showing sizes of various capacitors in the capacitor array are quaternary circuits, and the number of the reference voltage generators is three; the switching technology comprises a common-mode level switchover downward type and a successive approximation method; according to the low-power-consumption Radix-4 charge weight distributed type DAC and the switching technology, the toggle switch is controlled by the digital signals for making the reference voltage generators connect or disconnect with capacitors, so that charges on polar plates of the various capacitors are redistributed, and analog ...

Oil paper insulation breakdown intensity test apparatus and method

The invention provides an oil paper insulation breakdown intensity test apparatus. An oil gap width and an oil paper proportion are adjustable when an electrode device is used, and a related test method is provided. The test apparatus comprises a high voltage portion, a low voltage portion a paper plate adjusting portion. The apparatus simplifies the tedious steps of distance and proportion adjusting in a conventional oil paper insulation test, can flexibly and conveniently adjust the oil gap width and the oil paper proportion, is applied to an overvoltage resistance contrast test in DC, AC and AC/DC composite electric fields, and provides an innovative operation concept and a good test base for oil paper testing. The apparatus is simple in structure and convenient to operate. A test result shows that good test effects can be obtained.

Extra -large -size pressure steel pipe ring crane fit -up man utensil of putting more energy into

The utility model discloses an extra -large -size pressure steel pipe ring crane fit -up man utensil of putting more energy into, including the hoist, fixture and chain block, the hoist includes frontbezel and backplate, be connected through a plurality of screw rods between front bezel and the backplate, the front bezel is provided with the preceding antifriction bearing who is used for with theouter anchor ring contact of steel pipe, the backplate be provided with the first lug board be connected with chain block with be used for with the steel pipe in the out -of -the -way antifriction bearing of anchor ring contact, be provided with between front bezel and the backplate and be used for pressing the last antifriction bearing at steel pipe apical ring shape terminal surface, go up antifriction bearing, to installing in proper order down on back of the body antifriction bearing and the preceding antifriction bearing follow, the hoist is including being used for the U -shaped cardboard ...

Hybrid DAC capacitor array structure

The invention discloses a hybrid DAC capacitor array structure which comprises n C2C capacitor array units, m binary capacitor array units and a redundant capacitor. A node corresponding to the first bit in the n C2C capacitor array units is connected with the redundant capacitor and serves as the input end of the capacitor array structure, a node corresponding to the nth bit is connected with nodes corresponding to the bits from the n+1th bit to the n+mth bit to serve as the output end of the capacitor array structure, and a lower electrode plate of the capacitor at the lower end of each node is connected with a selection switch. The C2C capacitor array units and the binary capacitor array units are combined, so that the structure has the advantages that precision of a binary weight capacitor array structure is high and power consumption of an attenuation capacitor array structure is low, and the requirements for low power consumption and high precision of various simulation electronic ...

Rotary valve assembly limited by double-pin

Power redirector of awl-end screw axial limiting

Reinforced corrugated pipe with adapting and inserting ports

The invention relates to a reinforced corrugated pipe with adapting and inserting ports. The corrugated pipe comprises a pipe body, wherein the adapting port is formed in one end of the pipe body, an axial rib is arranged on the outer wall of the adapting port, a radial rib is arranged on the inner wall of the adapting port, the inserting port matched with the adapting port is formed in the other end of the pipe body, a buckling groove is formed in the outer wall of the inserting port, and a matched buckling piece is mounted at the buckling groove. The reinforced corrugated pipe has the benefits as follows: the reinforced corrugated pipe with the adapting and inserting ports is high in strength in joint positions, high in firmness, convenient to operate and low in product cost.

Corrosion resistant coating for strong acid rain environments and preparation method thereof

The invention discloses a corrosion resistant coating for strong acid rain environments. The coating is composed, by mass, of 30%-45% of fluorocarbon resin, 10%-15% of curing agent, 20%-40% of polystyrene-b-polydimethylsiloxane polymer, 10%-30% of pigment fillers and 1%-5% of additives. The polystyrene-b-polydimethylsiloxane polymer with good hydrophobicity, acid resistance and ultraviolet radiation resistance is used for greatly enhancing acid resistance and ultraviolet radiation resistance of the coating. The corrosion resistant coating is a high-performance fluorocarbon composite coating with high weather resistance, acid resistance, hydrophobicity and construction easiness. The coating is especially suitable for anti-corrosion engineering of coating on surfaces of heavy anti-corrosion support systems such as bridges, power facilities and ships.

Gas density relay verification method based on monitoring device

The invention discloses a gas density relay verification method based on a monitoring device, the monitoring device comprises a signal acquisition intelligent control unit and a pressure adjusting mechanism, and the pressure adjusting mechanism comprises a shell, supercharging equipment and a plugging mechanism; the shell forms a sealed cavity, and the supercharging equipment and the plugging mechanism are located in the sealed cavity; the calibration method for the gas density relay comprises the following steps: performing down stroke calibration and up stroke calibration on the gas density relay under the conditions that a connecting pipeline between a sealed cavity and electrical equipment is closed and the sealed cavity is conducted with the gas density relay; by means of the method, in-situ verification of the gas density relay is achieved, it is guaranteed that gas in the gas density relay does not leak, and safe operation of a power grid is guaranteed.