412results about How to "Extend mechanical life" patented technology

The invention relates to a lubricating oil additive based on single-layer or more-layer graphene, belonging to new high-tech materials and application field thereof and being mainly used for improving the property of lubricating oil. The lubricating oil additive is characterized in that single-layer or more-layer graphene and a dispersing agent are added into base oil, the content of the single-layer or more-layer graphene in the base oil is 0.0001-10 percent by mass, and the content of the dispersing agent in the lubricating oil is 0.001-2 percent by mass. The graphene has high specific surface area and thickness of 0.34-10 nanometers, is shaped as a sheet, is combined with the dispersing agent after being subjected to surface modification, and has excellent stability and dispersity in the base oil without easily precipitating like other additives. Under same filling amount, compared with the sheet graphite and the traditional graphite, more graphene can be absorbed on the secondary surface of the friction, the lubricating and anti-wear property of the base oil is improved, and the bearing capacity is enhanced.

The invention relates to a yaw control method for a large-sized wind powered generator unit. A current yaw angle reference value alpha reference is obtained according to a current wind direction, a current yaw angle practical value alpha practice is obtained by a encoder or a tachometer, a yaw angular error delta alpha is obtained by subtracting the yaw angle practical value alpha practice by the current yaw angle reference value alpha reference, and a corresponding yaw mechanism control rule is calculated by integrating the yaw angular error delta alpha and the variation tendency thereof by a fuzzy controller. Furthermore, an obtained electrical signal of the yaw mechanism control rule is sent to a yaw actuating mechanism to control a propeller pitch angle, and the yaw angle of the wind powered generator unit traces the yaw angle reference value alpha reference to enable the yaw angle practical value alpha practice and the yaw angle reference value alpha reference of the wind powered generator unit to be kept consistent. The invention obviously enhances the total precision, is favorable to increasing the year total generated energy of the wind powered generator unit, has high adaptability for complex and extreme cases, greatly enhances the operating effectiveness, furthest prolongs the mechanical life of the yaw actuating mechanism, and also has low remodel difficulty and low cost.

The invention discloses an intelligent control module of a permanent magnet contactor, which mainly comprises a microprocessor, a rectifier and filter, an internal working power circuit, a rechargeable battery control circuit, a closing operation module, an opening operation module, an energy-storage capacitor voltage detection circuit, a control voltage detection circuit, a power off detection circuit, and a key-press setting and display control circuit; wherein, the closing operation module consists of a first MOSFET driving protection circuit and a first MOSFET; and the opening operation module consists of a second MOSFET driving protection circuit and a second MOSFET. The intelligent control module can set delay time parameters of transient interference electricity through key-presses according to requirements of a customer, realizes delay disconnection of the permanent magnet contactor and can ensure the stable and continuous operation of equipment through staying away from influences of interference electricity; and as for conditions of requiring urgent opening operation, the intelligent control module can immediately cut off the contactor through key-press control, so as to ensure the safety of the operating equipment.

The invention discloses a preparation method of a high-strength and antioxidant rare-earth-based smoke denitration catalyst. The preparation method of the high-strength and antioxidant rare-earth-based smoke denitration catalyst comprises the following steps: by taking titanium dioxide and montmorillonite as carriers and ammonium metatungstate, cerous nitrate and lanthanum nitrate as active components, mixing, ageing, kneading, forming, drying and roasting with the accompanying of auxiliary materials. The auxiliary materials comprise ammonia water, lactic acid, citric acid, stearic acid, glass fiber, wood pulp, hydroxypropyl methyl cellulose, polyoxyethylene, monoethanolamine and water. The product prepared by the method is separated under a high SO2 smoke condition, nitric oxide in the smoke can be decomposed; meanwhile, the purpose of removing mercury and dioxin can be achieved. According to the preparation method of the high-strength and antioxidant rare-earth-based smoke denitration catalyst, the rare earth elements, namely cerium and lanthanum are used as the active components, so that the addition amount of vanadium is reduced, the toxicity of the product is reduced or the product is non-toxic product, the pressure of the post treatment of the product is reduced; the environmental protection pressure is reduced; the product is environmentally friendly; the product can be widely used in the field of thermal power plants, glass factories and chemical plants.

The invention provides a permanent magnet motor with an external spiral rotor and a permanent magnet suspension wheeltrack vehicular access system. The external part of the motor is provided with the external spiral rotor, so that larger output power is obtained with the same external diameter. The permanent magnet motor with the external spiral rotor is applied to efficient drive and efficient power generation recovery brake kinetic energy of a magnetic suspension train, can be used for driving a permanent magnet suspension wheeltrack subway, a permanent magnet suspension vehicle and a four-channel elevated railway passenger car, and is used for elevated permanent magnet suspension towing machine to convey cars or trucksin an enegy saving way. Due to the adoption of the elevated bidirectional four-channel permanent magnet suspension wheeltrack high-speed rail, the constructing cost of a permanent magnet suspension high-speed rail can be lower than that of the existing high-speed rail, and a realistic significance is realized on energy conservation of transportation sector and national energy-saving emission reduction.

The invention discloses a flexible Rogowski coil used for detecting the direct-current system short-circuit current and a method for designing the same, the coil comprises a coil and a loop uniformly wound around an annular flexible framework with an opening, an outer layer insulating bush is sleeved outside the coil and the loop, a plug-type interface attached to the coil and the loop is installed on the opening of the annular flexible framework, the coil outgoing line is connected with a sampling resistance module after being educed through the hole of the plug-type interface, the sampling resistance module educes a signal and is connected with a post-integrating circuit. In the Rogowski coil loop winding technique adopted in the invention, the return wire and the coil winding are constituted by one wire. The head end and the tip end of the Rogowski coil are connected by the plug-type interface, which can improve the mechanical life of the Rogowski coil to a great extent, has the advantages of high reliability and convenience for disassembly and installation; the method for designing the Rogowski coil used for detecting the direct-current system short-circuit current can combine the short circuit physical circumstances and the field working condition of the direct-current system.

The invention provides a propeller pitch variation control method for a large-sized wind powered generator unit. The method comprises the following steps: a rotating speed error delta omega is obtained by subtracting the practical rotating speed omega practice of a current main bearing by the rotating speed expected value omega expectation of the current main bearing, a corresponding propeller pitch angle reference value beta reference is calculated by integrating a rotating speed difference delta omega and the variation tendency by a fuzzy controller, the propeller pitch angle reference value beta reference is transmitted to the wind powered generator unit which realizes the control of the propeller pitch angle for a propeller pitch variable actuating mechanism, and the pneumatic shape of a changed propeller pitch angle blade is changed so as to enable the bearing force of the changed propeller pitch angle blade to be changed and the rotating speed of the wind powered generator unit to trace the rotating speed expected value omega expectation. The propeller pitch variation control method obviously enhances the total precision, is favorable to increasing the annual total generated energy of the wind powered generator unit, has high adaptability for complex and extreme cases, greatly enhances the operating effectiveness, furthest prolongs the mechanical life of the propeller pitch variable actuating mechanism, and also has low remodel difficulty and low cost.

The invention discloses a catalyst used for synthesis of paraxylene through alkylation reactions between coking benzene and methanol and a preparation method thereof. The catalyst comprises carriers and active components, the carriers are HZSM-5 molecular sieves or SAPO-11 molecular sieves which have been subjected to a water steam heating treatment, and the active components are metal oxides. The molecular sieves are subjected to a high-temperature water steam heating treatment, thus active centers and acid-base properties of the molecular sieves are evenly distributed, and the acidity of the molecular sieves is reduced, so active components can be evenly loaded on the carriers, the catalyst is not easy to be poisoned or lose activity when the catalyst is catalyzing the alkylation reactions of coking benzene, the conversion rate of the alkylation of coking benzene is increased, and the service life of the catalyst is prolonged at the same time.

The invention discloses a manual and motor-driven integrated operating mechanism of a breaker. The manual and motor-driven integrated operating mechanism comprises a first fixing plate and a second fixing plate which are installed on a middle cover of the breaker, a movable separation plate is arranged below the first fixing plate, one end of the separation plate is connected with the first fixing plate through a locating pin, a manual / automatic switch is arranged at the other end of the separation plate, a motor is arranged on the separation plate, a gear is connected onto a main shaft of the motor, the second fixing plate is arranged on one side of the first fixing plate, a sliding plate is arranged on the second fixing plate, a rack matched with the gear is fixed on the sliding plate, and the sliding plate is in transmission connection with an operation handle through a linkage component. The operating mechanism of the breaker is installed on the middle cover of the breaker, and the handle can be operated by directly operating the breaker. The manual and motor-driven integrated operating mechanism is simple and reliable in mechanism, convenient to operate and small in size, can achieve automatic manual reliable switching and prolongs mechanical service life.

To provide a corrosion-resisting and wear resisting alloy including cobalt, nickel or iron as a base used for a sliding part or a valve seat for a machine, and restraining erosion and corrosion caused by eutectic carbide constituting the alloy in an atmosphere with dissolved oxygen. A material is selected from a cobalt base added with Cr and / or W, a nickel base added with Fe and / or Cr, and an iron vase added with Cr and / or Ni. The material is cast into an ingot or a slab to produce an intermediate material. The intermediate material comprises mesh-like eutectic carbide and a base material surrounded by the eutectic carbide. A heat plastic forming is applied to the intermediate material at a temperature 650° C. or more and the solidus temperature or less. The eutectic carbide is formed into multiple grains or clusters as a discontinuous distribution. A resulting corrosion-resisting and wear-resisting alloy has 0.1 to 0.5 of coefficient of friction, and 300 to 600 Hv of Vickers hardness without age-hardening process.

The invention relates to a direct-current rotary cultivator comprising a frame, a driving device supported by the frame, a cultivating device connected with the driving device through a transmission device, and a control device electrically connected with the driving device and the transmission device; wherein the frame comprises a machine body, a resistance rod and an armrest assembly; the driving device comprises a direct-current motor and a battery pack; the transmission device comprises a first transmission device and a second transmission device, and is connected with the cultivating device through a transmission shaft connected with the second transmission device; the cultivating device comprises a knife rest assembly and a rotary cultivating knife assembly; and the battery pack is arranged between the knife rest assembly and the axle line direction of the armrest assembly. The direct-current rotary cultivator has the advantages of small volume, high efficiency, long service life, easiness, convenience and safety for operation, and uniform cultivated soil particles, and has the functions of self-protection and early warning.

The invention relates to a method for extracting copper from waste circuit boards, comprising the following steps: crushing the waste circuit boards for the first time by cutting, crushing the waste circuit boards for the second time by a heavy punch, and crushing the waste circuit boards for the third time by air separation at medium speed; magnetically separating mixed metal materials, adding the mixed metal materials to a sulfuric acid solution for dissolving to transfer copper, zinc, nickel and the like into the solution; and transferring the leaching solution into an electrolytic bath so that copper gains electrons at the cathode and pure copper is precipitated. The method provided by the invention can reduce the production cost and has high copper recovery rate.

The invention provides a mine hoist fault diagnosis method and system based on an expert system. The method comprises the following steps of: (1) arranging a knowledge base for storing fault information and corresponding action signals; (2) monitoring and collecting the working state information of a direct current motor; (3) judging whether a fault exists according to the working state information of the direct current motor; (4) if the fault exists, comparing the fault information sorted in advance with the knowledge base, and obtaining the corresponding action signal; and (5) if no fault exists, circularly monitoring the working state of the motor. The mine hoist fault diagnosis method and system based on the expert system have the advantages of high reliability and capability of effectively prolonging the service life of a machine and increasing the production efficiency.

The invention is concerned with the antiskid structure of the lever of the circuit breaker operating mechanism, includes the side sheet subassembly, on the side sheet of the operating mechanism where the rotation feet of the lever is in touch with the side plate can turn to; and the antiskid structure also includes the lever subassembly, on the rotation feet of the lever, cooperates with the circuit breaker operating mechanism's side sheet and its subassembly limit the rotation foot of the lever sliding to the medal or the forth. The antiskid structure provides the inter-bound movement betweens the lever and the side sheet support, limits the rotation foot of the lever sliding to the medal or the forth, and reduces the contact surface and the frictional resistance by using the small convex stage, improves the product life cycle.

The invention provides a high specific surface area honeycomb type denitration catalyst which comprises 70%-75% of titanium silicon tungsten powder, 0.2%-0.4% of vanadium, 3%-5% of ceiba, 5.5%-7.5% of glass fiber, 6%-7% of ammonia water, 10%-11% of deionized water and 0.4%-0.6% of glue; the raw materials are prepared according to the percentage and mixed into a slurry, and the catalyst is manufactured through die whole extrusion forming. The invention further provides a preparation method of the catalyst, and the method comprises slurry mixing, mixed gluing, discharging pre-extrusion, extrusion drying, calcination cutting and assembly forming. According to the high specific surface area honeycomb type denitration catalyst, formulation design can be performed according to actual fume conditions, the specificity is high, and the adaptability is wide; the catalyst is prepared through a high temperature calcination process, and the resistance to instantaneous high boiler temperature is excellent; the catalyst at a fume inlet is soaked with a curing agent so that the end surface intensity is improved, the wear resistance is high, and the mechanical life is long; superfine TiO2 is used as a substrate so that the activity is high; poison resistance is excellent by the aid of the special formulation design; the application range is wide, and the reliability is high.

The present invention relates to a breaker interlocking device. It is applicable to mechanical and electric interlocking between two plastic shell breakers in duplicate supply switching device. Said breaker interlocking device includes a mounting base plate and a slide block whose middle portion is easy slide fit on the mounting base plate by means of slide mechanism and whose two ends are extended to the exterior of said mounting base plate. It is characterized by that on the end surface of every end of the above-mentioned slide block a projection is formed respectively, on the mounting base plate are set first signal switch and second signal switch which are correspondent to two projections of said slide block, so that said inter locking device can simultaneously implement mechanical interlocking and electric interlocking.

The invention relates to agricultural machinery, in particular to harvesting machinery for tuber crops of rootstalk crops such as potatoes, sweet potatoes and the like, concretely a turntable type potato harvesting machine, which mainly comprises a traction mechanism, a connecting turntable separation mechanism and a selection automatic sieving separation mechanism. The invention has a work mode that a tractor is connected with the traction mechanism for digging, in addition, the soil and the tuber crops are separated through the turntable separation mechanism, or the automatic sieving separation is selected. The invention fast and sufficiently separates the soil and the tuber crops, is not easy to cause machinery damage, prolongs the service life of the machinery, is not easy to cause soil adhesion, reduces the abrasion on the potatoes, and has safe use.

The invention discloses an EPB for vehicles and a control method. The EPB comprises an electrical park control unit and a park actuating mechanism which are communicated, wherein the electrical park control unit comprises a tilt sensor and a current detection device and is connected with an ignition signal, a park switching signal and a gear signal respectively; and the current detection device comprises a current sensor, and the electrical park control unit calculates the park clamping force through the detected current. According to the technical scheme, the mechanical life of the park actuating mechanism can be prolonged, noise in a parking process of a vehicle can be reduced, and fuel consumption can be reduced; and simultaneously, the production cost is low, the safety, stability and reliability are high, and the like.

The invention discloses a driving mode control-based single-phase vacuum circuit breaker of a double arc-extinguishing chamber. The single-phase vacuum circuit breaker comprises a mounting panel, wherein a control box is arranged below the mounting panel; a vacuum arc-extinguishing chamber embedded pole is arranged in a vertical direction; two arc-extinguishing chambers are formed in the vacuum arc-extinguishing chamber embedded pole; the vacuum arc-extinguishing chamber embedded pole is connected with a mounting disc and fixed on the mounting panel; both arc-extinguishing chambers are connected with leading-out wires; moving contacts of both arc-extinguishing chambers are connected with an electrical connecting piece; all the moving contacts below nuts of both arc-extinguishing chambers are sleeved with a disc spring, a three-way part and a nut part; the three-way part is connected with an insulation pulling rod; the insulation pulling rod is connected with a permanent magnetism operating mechanism; and the permanent magnetism operating mechanism is connected with the control box. In the driving mode control-based single-phase vacuum circuit breaker of the double arc-extinguishing chamber, the arc-extinguishing chambers and the insulation pulling rod are sealed and insulated by the vacuum arc-extinguishing chamber embedded pole, the electrical connecting piece connects the moving contacts of the arc-extinguishing chambers to form a series-connected double-break form, and the disc spring is pressed in a piston type driving mode, so the mechanical life of the circuit breaker is greatly prolonged.

The invention discloses a high-speed vacuum DC current-limiting circuit breaker, comprising a high-speed vacuum contact mechanism for quickly opening when receiving an external command, and a reverse current generating circuit for producing a current zero-crossing point in a vacuum interrupter , a freewheeling circuit used to obtain zero voltage recovery time after the current of the vacuum interrupter crosses zero, and an energy absorption circuit used to absorb circuit energy, the high-speed vacuum contact mechanism, reverse current generation circuit, freewheeling circuit connected in parallel with the energy absorption circuit. The invention has the advantages of strong current limiting ability, rapid action, reliable shutdown and the like.

A fan controller reduces the percentage of time that fans used in a heat exchanger of an outdoor cabinet that houses electronics and power source must operate to provide required cooling to the electronics and power source. The fan controller can also reverse operation of a fan of the heat controller to help reduce clogging of air intakes as well as to clean the interior of the cabinet. In an embodiment, the controller operates the fans in the heat exchanger according to operating temperature ranges. Thermostats can be used to provide the operating temperature ranges. Depending on the state of the thermostats and the ambient temperature, the fan controller causes one fan to operate in the reverse direction while the other fan is idle, causes one fan to operate in the forward direction while the other fan is idle, or causes both fans to operate in the forward direction.

The invention discloses a wood processing production line with a waste recycling function. The wood processing production line comprises a worktable, an auxiliary conveying belt and a conveying frame, wherein the auxiliary conveying belt and the conveying frame are arranged on the left side and the right side of the worktable correspondingly. A polishing unit is arranged on the auxiliary conveying belt. A laser carving unit is arranged on the rear side of the worktable. A cross beam is arranged on the upper surface of the worktable. A bearing plate is arranged on the cross beam. A cutting unit and a clamping unit are arranged on the bearing plate. The conveying frame is provided with a transfer unit. A waste piece transfer unit is arranged on the front side of the worktable and is jointly composed of a base, a first rotating motor, a rectangular bracket, bearing tables, notches and vacuum suction cups, wherein the base is arranged on the front side of the worktable, the first rotating motor is arranged in the base, the rotating end of the first rotating motor stretches out of the base, the rectangular bracket is arranged at the rotating end of the first rotating motor, the bearing tables are arranged at the left end and the right end of the rectangular bracket, the notches used for containing plates are formed in the bearing tables, and the vacuum suction cups are arranged on the lower surfaces in the notches. The wood processing production line has the beneficial effects of being simple in structure and high in practicability.

The invention discloses an operating mechanism used for a three-station switch. The operating mechanism comprises partition plates, an output main shaft, a drive mechanism and a limiting mechanism, wherein the drive mechanism controls rotation of the output main shaft so that an output shaft connecting lever on the output main shaft can swing between the isolation station, the grounding station and the switch-on station, the drive mechanism comprises an operating main shaft, a grounding main shaft and a switch-on main shaft, and the operating main shaft drives the grounding main shaft and the switch-on main shaft so as to drive the output main shaft to rotate to the grounding position and the switch-on position. One end of the grounding main shaft and one end of the switch-on main shaft are respectively provided with a connecting lever and a spring, wherein the connecting levers and the springs can drive the output main shaft to rotate rapidly, and the limiting mechanism locks the output shaft connecting lever located in the isolation station or the grounding station or the switch-on station. The operating mechanism used for the three-station switch has good switching-on performance, the output main shaft can be accurately limited in the isolation position or the grounding position or the switch-on position, abrasion among all parts can be reduced, and the mechanical service life of limiting parts can be prolonged to the maximum.

The invention relates to a vacuum breaker used for electric locomotives and motor train units, which is a vertical column and consists of a high voltage part, an insulation supporting part and a low voltage control part which are sequentially laminated from top to bottom; the vacuum breaker is characterized in that a spring mechanism in the high voltage part is an integrated three-column typed spring mechanism and consists of a closing spring, a pressing plate component which pushes through the spring, a cylindrical chamber which receives the closing spring, a connecting base which is connected with a movable contact and a spring cover which is matched with the connecting seat; the pressing plate component, the spring cover and the closing spring are arranged coaxially. The invention improves the mechanical service life which is up to more than 300,000 times of use, greatly reinforces the insulation performance, quickens the response speed, improves the on-off performance (up to 660MVA) of the product by reasonable configuration of operation force and operation speed, has an inherent opening time less than 30ms, has fast response speed and can protect the locomotive equipment and safety of personnel better.

The invention discloses an on-column circuit breaker with a built-in isolation switch, and belongs to the technical field of intelligent power distribution equipment; the on-column circuit breaker comprises a circuit breaker, an isolation switch, a secondary element and a transmission mechanism used for completing opening and closing of the circuit breaker and the isolation switch which are arranged in the same closed box body, wherein the circuit breaker comprises a three-phase primary conductor and an arc extinguishing chamber of the three-phase primary conductor; after arc extinguishing chamber passes through a sealing pole column, the arc extinguishing chamber is connected with an isolation switch contact through a small pull rod and is integrally sealed by an independent insulating box; a partition plate which is sealed with the inner wall of the box body is arranged in the box body to separate the primary conductor and the secondary element from the transmission mechanism; and the arc extinguishing chamber is in linkage with an isolation insulation pull rod of the transmission mechanism; and sealing treatment is carried out on the connection position of the isolation insulation pull rod for penetrating through the partition plate and the partition plate. By virtue of the on-column circuit breaker with the built-in isolation switch, the hidden danger that an existing vacuum circuit breaker has a fracture induction voltage defect and an external isolation electrified body is exposed can be solved, the service life of the isolation switch and the service life of the circuit breaker are consistent, and the whole maintenance-free is realized.

The invention provides an energy-saving automatic control device of a cloth-bag dust removal system and a control method for blast furnace dust removal. The energy-saving automatic control device comprises an input unit, a variable frequency drive unit, an execution unit and a PLC (programmable logic controller) control unit, wherein the input unit is composed of a fast acting fuse, a contactor and an electric reactor; the variable frequency drive unit consists of a rectification module and a capacitor, together with a braking unit, an inverter, a CPU (central processing unit) with a vector control function and a 220V power supply; the execution unit is composed of an electric reactor, a throttle rotary actuator and a throttle control device; the PLC control unit is composed of a PLC and an auxiliary circuit; the primary side of the rectification module of the variable frequency drive unit is connected with an output end of the electric reactor of the input unit and the secondary side of the rectification module is connected with the electric reactor of the execution unit through the capacitor and the inverter; the rectification module and the inverter are connected with the CPU through a bus, the CPU and the PLC are connected in a communication manner through a switching value and an analog quantity, and a throttle control end of the PLC unit is connected with the execution unit. Meanwhile, the device is used for controlling the blast furnace dust removal. By adopting the energy-saving automatic control device and the control method provided by the invention, the fan utilization can be improved, the accuracy control on the dust removal can be realized, the electric energy can be saved, heat productivity of the device can be reduced, the dust recovery rate can be improved, the cloth-bag damage rate can be reduced, and exhaust gas and dust emissions can be decreased.

Sealed chamber for monitoring pressure 23 is provided on sealed tank 37. Sealed tank 37 is filled with insulating gas. And, a connection using insulated pipe 19 is provided between medium-pressure space 18 that makes a medium pressure and sealed chamber for monitoring pressure 23. In sealed chamber for monitoring pressure 23, a pressure monitoring and controlling means is provided for monitoring the internal pressure thereof to activate the pressure-release control in response to the situation where the monitored internal pressure has reached the predetermined setting value. The pressure monitoring and controlling means includes solenoid valve 28 that is capable of opening sealed chamber for monitoring pressure 23 to the atmosphere, pressure detector 26 that detects the internal pressure, and pressure monitor 27, which activates solenoid valve 28 for pressure-release when pressure detector 26 detects that the internal pressure has reached the predetermined abnormal pressure value.

The invention relates to a high-voltage direct-current contactor which is suitable for medium load systems in electrical power, metallurgy, mines, petroleum, traffic transportation and the like, and is especially suitable for a capacitor charging loop on an electric locomotive converter. The high-voltage direct-current contactor comprises an engine part, an electromagnetic drive part, a transmission part, a magnetic blow-out part, an auxiliary contact and an arc extinguish chamber, wherein the engine part is provided with a base, a main frame and a main frame cover plate; the transmission part is provide with a push rod, a reset spring, a rotary rack, a moving main contact and a moving arc contact; the electromagnetic drive part is provided with a cylindrical yoke, a movable iron core and a coil, and a lining is arranged between the cylindrical yoke and the movable iron core; and the magnetic blow-out part is provided with an iron core, a magnetic conducting iron plate, a magnetic blow-out coil, a static arc contact, an upper connecting copper bar and a static main contact. The high-voltage direct-current contactor has the advantages of long electric service life, high breaking speed, strong shock resistance capacity, compact structure, small volume, good tightness and the like, and is convenient in assembly and maintenance.

An energy-saving rolling and kneading machine has a drum body with feeding opening, a cover of said opening, and the material kneading plates in said drum body. Its advantages are high volume and high stability.