41 results about "Arc resistance" patented technology

A converter station AC filter group circuit breaker abnormal arcing modeling analysis method comprises the following steps: firstly, carrying out time mark alignment, amplitude calibration and filtering de-noising on wave recording signals such as AC bus voltage and filter branch current to obtain high-quality input data; then, combining a primary wiring diagram, enabling an alternating current system to be equivalent to an ideal power supply and series impedance, enabling circuit breaker arcing to be equivalent to arc resistance changing along with time, and constructing an equivalent circuit model comprising the power supply, the impedance, a capacitor, an electric reactor and dynamic arc resistance; establishing a state space equation according to a voltage and current constraint relation, and performing time domain solution by adopting a two-step two-order or three-order diagonal implicit Runge-Kutta method to obtain voltage and current responses of the whole process of the fault; on this basis, the arc resistance change is inversed according to the ratio of arc voltage to current, the current zero passage is identified through the resistance symbol change at adjacent moments, and the zero passage section is smoothed; and finally, the inversion result is verified again by means of the simplified equivalent model.

The utility model belongs to the technical field of furnace roller thermal spraying, and particularly relates to a furnace roller thermal spraying clamping tool which comprises a working table, a mounting plate is mounted at the top of the working table, a supporting column is fixedly mounted at the top of the mounting plate, a lower arc plate is fixedly mounted at the top of the supporting column, an upper arc plate is hinged to the top of the lower arc plate, and the upper arc plate is hinged to the top of the upper arc plate. According to the furnace roller cleaning device, the upper arc plate which is opened and closed is closed to the top of the lower arc plate, then a threaded column is rotated, so that an arc-shaped abutting plate is attached to the outer surface of the furnace roller, the heating wire on the inner wall of the lower arc plate is powered on, the friction assembly is installed in the upper arc plate, and the friction assembly is used for conducting friction cleaning on the outer surface of the furnace roller. The outer surface of the furnace tube is preheated, and the arc-shaped abutting plates rub and clean the outer surface of the furnace roller, so that the effect of preheating and cleaning the outer surface of the furnace roller is achieved.

The application provides a simulation method, system and device considering the closing pre-breakdown characteristics of a circuit breaker, and belongs to the technical field of SF6 circuit breaker simulation. The method comprises the following steps: S1, establishing an SF6 circuit breaker controlled element model in simulation software, wherein the controlled element model comprises the relationship between the closing state in the closing process of the circuit breaker and the SF6 gas parameters, and the relationship between the SF6 circuit breaker gap voltage; and the relationship between the arc resistance value in the closing process of the circuit breaker and the arc parameters, the SF6 circuit breaker gap voltage, and the passing current of the SF6 circuit breaker; S2, building an SF6 circuit breaker test circuit simulating a power system and connecting the SF6 circuit breaker controlled element model to the SF6 circuit breaker test circuit; and S3, loading the SF6 gas parameters and the arc parameters, adjusting the real-time gap voltage and the real-time passing current, and performing the system electromagnetic transient process simulation of the SF6 circuit breaker closing pre-breakdown in the SF6 circuit breaker test circuit.

The invention discloses an electric contact material for a high-resistance circuit breaker and a preparation method of the electric contact material, and relates to the technical field of electric contact materials for circuit breakers, the material comprises the following components based on 100 parts by weight of the total weight of a finished product: 92.0-96.8 parts by weight of a pre-alloyed matrix phase which is Ag-30Ni pre-alloyed powder prepared by a gas atomization method; an in-situ carbon reinforcing phase: 1.0 to 2.0 parts by weight of a novolac resin powder as a carbon precursor; the three-phase functional layer phase is 0.1-5.0 parts by weight and is one of tungsten carbide and titanium carbide or a compound of tungsten carbide and titanium carbide according to the weight ratio of 1: 1; the copper infiltration filling phase is electrolytic copper powder or oxygen-free copper liquid; a multi-phase synergistic material system is constructed, all components are complementary, core performance such as arc resistance is balanced and optimized, and the problem that a traditional contact material is short in service life is solved; a precise preparation process chain is integrated, the structure and performance are directionally regulated and controlled, defects are reduced, the anti-loss capacity is improved, the strict requirements of a high-resistance circuit breaker are met, and the service cycle is prolonged.

The utility model belongs to the technical field of gasoline desulfurization, and discloses a device for desulfurization in gasoline preparation, which comprises a reaction box, a gas pipe is fixedly connected to one end of the reaction box close to the top in a penetrating manner, a one-way valve is fixedly connected to a pipe body of the gas pipe, and an oil outlet valve pipe is fixedly connected to the other end of the reaction box close to the bottom in a penetrating manner. A desulfurization part is arranged on the reaction box; t-shaped long plates are stressed and can slide in an arc abutting groove in a limiting mode, then a rotating disc is driven to rotate in a positioning mode in a charging barrel, rotation of the rotating disc can drive two T-shaped blocks to slide in the arc sliding grooves in the opposite directions, and therefore partition plates installed on the two T-shaped blocks can be driven to synchronously conduct limiting translation in the opposite directions in a disc groove; therefore, gasoline or a catalyst in the charging barrels can be discharged without tight separation of the two partition plates, and the two charging barrels can alternately discharge materials intermittently due to back-and-forth swinging of the swing plates, so that the mixing effect and efficiency can be improved subsequently.

The invention belongs to the technical field of insulators, and discloses an anti-pollution flashover umbrella skirt structure optimized composite insulator which comprises an insulating core rod and a plurality of umbrella skirt units arranged on the insulating core rod in a sleeving mode, each umbrella skirt unit comprises a main umbrella skirt body and an auxiliary umbrella skirt body, and an annular pollution dredging and flow guiding inclined face is arranged on the upper umbrella face of each main umbrella skirt body. The radial inclination angle of the sewage draining and flow guiding slope is gradually increased in a gradient manner outwards along the radial direction of the umbrella body; the edge of the lower umbrella surface of the main umbrella skirt body is provided with an annular arc-resisting rib; the arc cutting fracture structures cut off the circumferential development path of an electric arc, the annular arc blocking ribs lengthen the creepage path of the electric arc, meanwhile, the arc cutting fractures of the upper and lower adjacent main umbrella skirt bodies are distributed in a staggered mode, axial through of the electric arc is eradicated, the arc extinguishing probability is remarkably improved, and the arc extinguishing effect is improved. And pollution flashover is thoroughly inhibited, and the device is suitable for severe working conditions such as counter-weight pollution and rainstorm.

The invention discloses an arc resistance simulation verification method for a field suppression switch structure and operating characteristics, an arc resistance simulation verification device for the field suppression switch structure and operating characteristics, arc resistance simulation verification equipment and a computer readable storage medium. The method comprises the following steps: firstly, establishing a three-dimensional geometric model comprising an arc extinguish chamber, a contact system and an operating mechanism; then, constructing a mechanical structure dynamic simulation model to obtain the motion characteristics of the moving contact, and finally, establishing a multi-physical field coupling mathematical model based on a fluid dynamic equation, an electromagnetic field equation and a heat transfer equation to realize numerical simulation of the arc breaking process of the field suppression switch. According to the method, the flowing, electromagnetic and heat transfer characteristics of the arc are comprehensively considered, the whole process from generation to extinguishing of the arc can be completely simulated, and an effective simulation analysis means is provided for design optimization, performance evaluation and breaking capacity verification of the field suppression switch.

The application provides an insulating tube for high-voltage cable protection and a preparation method thereof. The insulating tube is composed of an outer tube, an inner tube and a transition layer. The raw material for preparing the outer tube comprises a base resin, a carrier resin, a flame retardant and a slip agent, wherein the flame retardant comprises low-melting-point glass fiber, a phosphorus-nitrogen intumescent flame retardant and a silane coupling agent; the raw material for the inner tube comprises a main body resin and a solubilizing agent; and the raw material for the transition layer comprises soluble fiber raw material, nano-clay and a dispersing agent. Through a composite flame-retardant system and a multi-layer structure design, the application significantly improves the arc resistance, the flame retardant grade and the interlayer bonding force of the insulating tube, solves the technical problems that the traditional insulating tube is prone to breakdown and peeling in a high-voltage environment, and is suitable for long-term safe protection of high-voltage cables.

The invention discloses a material composition for a high-pressure-resistant product and a preparation method of the material composition. The composite material comprises the following raw materials in percentage by mass: 40-55% of PPS; 25% to 35% of PPA; 10 to 20% of reinforcing fiber; 5-8% of a flame retardant synergist; 0.5-2% of a coupling agent; 0.3 to 1% of an antioxidant; and 3-5% of an inorganic filler. In the preparation process, a gradient temperature control melt extrusion process is adopted, and a fiber directional distribution and interface chemical bonding technology is combined, so that the material has high rigidity, low shrinkage rate and excellent arc resistance. The obtained material can still keep stable mechanical properties and insulation characteristics in a high-humidity and high-pressure environment, is suitable for the fields of high-voltage connectors of new energy automobiles, electronic and electric appliance parts and the like with strict requirements on dimensional accuracy and voltage resistance grade, and solves the technical contradiction that high CTI value of PPA is difficult to cooperate with high rigidity and dimensional stability of PPS.

The utility model provides a high-precision multidimensional welding robot, which relates to the technical field of welding robots and comprises a main mounting rack, the main body of the main mounting rack is an L-shaped rack body, the top of the main mounting rack is slidably provided with a movable arm seat matched with a guide rail, and the outer side of the top of the movable arm seat is rotatably provided with a swing arm; a lifting arm is slidably arranged at the outer end of the swing arm, an elevation arm is hinged to the bottom of the lifting arm, a support is fixedly arranged at the bottom of the elevation arm, and a middle sliding block is fixedly arranged at the bottom of the support. An arc-shaped resistor is arranged, the swinging angle can be monitored, a second servo motor drives a swinging arm to rotate, swinging can be conducted, and an electric cylinder is used for pushing a positioning friction block to press the swinging arm to conduct fixing; and during rotation of the swing arm, the trigger block slides in a manner of being attached to the arc-shaped resistor, the resistance of the arc-shaped resistor is adjusted, the swing angle can be calculated and monitored through resistance change feedback, and the problem that an existing welding robot is inconvenient to monitor dimensional movement is solved.

A recyclable epoxy resin system for electrical insulation is provided The recyclable epoxy resin system comprises a resin component, at least recyclable curing agent and at least one filler. Said recyclable epoxy resin has a dielectric strength (t=2 mm) of more than 22 kV / mm as measured by IEC 60243 and a dry arc resistance of more than 400 seconds as measured by ASTM D 495.

The utility model discloses a steel tube tower holding pole fixing device, which relates to the technical field of electric power engineering and comprises a holding hoop main body, a first semi-arc sleeve and a second semi-arc sleeve of the holding hoop main body are in butt joint to form an annular holding hoop, arc cavities are arranged in the first semi-arc sleeve and the second semi-arc sleeve, inner arc plates are arranged in the arc cavities in a sliding manner, and the inner arc plates are arranged in the arc cavities. And notches are formed in the positions, close to the ends, of the upper end and the lower end of the inner arc plate, gradually-high arc strips are fixed in the notches, and driven ladder blocks are arranged on the inclined upper surfaces of the gradually-high arc strips in a sliding mode. The two sets of semi-arc sleeves which are in butt joint in a staggered mode can be conveniently connected to the outer wall arm of the holding pole in a sleeved mode, meanwhile, the bolts for locking the two sets of semi-arc sleeves are used for enabling the inner arc plates to stretch into the opposite semi-arc sleeves, locking of the two sets of semi-arc sleeves is convenient, meanwhile, the arc-shaped abutting pieces on the inner walls can be driven to get close to the hoop in the radial direction, and therefore locking is convenient. In this way, the holding power between the hoop and the holding pole can be increased, and the device is firmly connected to the outside of the holding pole.

This disclosure provides a method, apparatus, equipment, and storage medium for controlling a welding torch, belonging to the field of welding construction equipment for long-distance oil and gas pipelines. The method includes detecting a first welding arc resistance of the welding torch at a first position; determining a target welding arc resistance of the welding torch at the first position; and controlling the welding torch to oscillate in a direction perpendicular to the extension direction based on the first welding arc resistance and the target welding arc resistance. This disclosure can reduce costs and improve the reliability of pipeline welding.

This application provides a short-circuit protection device for a power generation system, relating to the field of low-voltage electrical appliances. It includes a frame containing a cavity through which the power supply arc passes; and a first arc-extinguishing grid, spaced apart within the cavity of the frame, forming a channel with the same path as the cavity. This application achieves progressive energy dissipation of the arc by setting up an alternately distributed three-stage arc-extinguishing grid system and a composite path control structure: the third arc-extinguishing grid and the front form a dense cutting layer to force initial arc splitting; the inclined connecting middle section and the second arc-extinguishing grid construct a twisted and elongated channel; the reverse bending section constructs a three-dimensional cable network to rapidly increase the arc resistance; the grooved and protruding sections guide the arc to bifurcate and ascend, ultimately forcing the arc to zero through the synergistic effect of multi-stage segmentation, path reconstruction, and heat dissipation area.

The invention discloses porcelain sand for extra-high voltage insulator production and a preparation method, the porcelain sand comprises the following components: 30-50 parts of formula mud, 13-18 parts of alumina powder, 10-15 parts of glaze powder, 4-9 parts of talc, 3-8 parts of first-class clay, 5-10 parts of second-class clay, and 4-9 parts of albite, the formula mud is prepared from the following components in parts by weight: 45 to 60 parts of kaolin, 25 to 30 parts of quartz sand, 10 to 15 parts of potassium feldspar, 8 to 10 parts of bentonite and 0.8 to 1.2 parts of carboxymethyl cellulose; the preparation method of the porcelain sand comprises the steps of ingredient grinding, magnetic separation for iron removal, filter pressing for dehydration, vacuum pugging, drying for sand making and high-temperature sintering. The porcelain sand has extremely high high temperature resistance, arc resistance and aging resistance, can be adhered to the root of an insulator blank through glue and is sintered and molded together with the blank, so that the root of the insulator can be better connected with a fitting through cement, and the overall mechanical strength and electrical performance of the insulator are improved.

The invention discloses a broadband conducted electromagnetic interference modeling method for very fast transient overcurrent on a secondary side of an electronic transformer, and belongs to the technical field of electromagnetic compatibility test simulation, and the method comprises the following steps: constructing a multi-arcing model of a GIS isolation switch, which is used for simulating and generating very fast transient overcurrent VFTC; the multi-arcing model is constructed by introducing fracture dynamic capacitance, establishing a segmented arc resistance model and setting arcing and quenching criteria; according to the method, fracture dynamic capacitance is introduced at the fracture of the disconnecting switch, segmented arc resistance models of three stages of pre-breakdown, steady-state combustion and arc quenching are fused, and meanwhile, accurate arcing and arc quenching criteria based on dynamic breakdown voltage and current zero-cross detection are set; the constructed multi-arcing model can highly vividly reproduce the VFTC waveform generated during the operation of the GIS disconnecting switch.

The invention relates to a process for producing low-nitrogen crude steel. This process includes melting directly reduced iron and / or scrap in a melting furnace with arc resistance heating to give a metallic melt and a slag. The metallic melt is removed from the melting furnace and used to charge a converter. The metallic melt is refined in the converter to give liquid crude steel. The liquid crude steel is tapped having a nitrogen content [N] of not more than 50 ppm, especially of not more than 30 ppm.

The invention discloses an arc-resistant insulator and a preparation process thereof.The insulator comprises a metal insert and an organic silicon resin composite material wrapping the metal insert, and the organic silicon resin composite material comprises an organic silicon resin base material, inorganic filler, a silane coupling agent and other auxiliaries; the organic silicon resin base material comprises organic silicon resin and functionalized microspheres, the functionalized microspheres are mesoporous nano silicon dioxide microspheres loaded with a ceramic precursor, the flexible Si-O-Si main chain of the organic silicon resin is utilized to realize organic coupling with the functionalized microspheres and the expansion modified mica sheet, and a three-dimensional network is formed after curing. A controllable mutagenesis ceramic state rigid network is formed on the surface of the insulator during high-voltage arc impact, the rigid network does not damage the surface microstructure of the insulator, and the pollution flashover resistance and the arc resistance level of the surface are guaranteed.

The application discloses a dynamic simulation method for breaking process of a molded case circuit breaker based on a heterogeneous simulation system, and relates to the technical field of low-voltage electrical appliance design and simulation. The application constructs a high-efficiency heterogeneous simulation system which is accurately dispatched by a cooperative simulation control module, and the loop current calculated by a first simulation subsystem is transmitted to a second simulation subsystem in real time, which is used to calculate the electromagnetic force driving the mechanism to move, and the contact displacement generated by the mechanism movement is fed back to the first subsystem immediately, which is used to dynamically update the resistance characteristic of the arc model, thereby affecting the calculation of the arc voltage, and the arc voltage is directly fed back to the circuit model, which determines the current value at the next moment, forming a complete dynamic interaction simulation chain from the circuit current, the electromagnetic force, the mechanical displacement, the arc resistance, the arc voltage and the circuit current, so that the simulation model can self-consistently reflect the dynamic evolution process of each physical quantity in the real breaking process.

The invention relates to a copper-chromium contact, a preparation method thereof and a high-voltage vacuum circuit breaker. The copper-chromium contact comprises a base body structure and a plurality of unit structures, the unit structures are longitudinally-extending cylinder structures, and the unit structures are longitudinally arranged in parallel in a honeycomb shape and embedded into the base body structure. Each unit structure comprises a framework area and a functional area, the framework area extends in the longitudinal direction, and the functional area surrounds the framework area in the circumferential direction; wherein the copper content ratio of the functional area is higher than the copper content ratio of the matrix structure, and the copper content ratio of the matrix structure is higher than the copper content ratio of the skeleton area. According to the copper-chromium contact, a three-dimensional interpenetrating structure which is high in interface bonding force and high in compactness can be formed between copper-chromium alloy phases with different component contents, then the excellent conductivity of copper is brought into full play, excellent arc ablation resistance and high-voltage resistance are provided with the help of chromium, and the copper-chromium contact has excellent conductivity and arc resistance.

The application discloses a modeling method for calculating an arc reignition model during a pantograph lowering process of a motor train unit based on PSCAD, considers an overvoltage factor, finds that the arc generated during the pantograph lowering process can cause a high overvoltage result, and establishes a simulation model for the situation. The simulation model modeling method proposed in the scheme is different from the prior art, and aims to propose a modeling method for simulating the arc reignition development and change process and the overvoltage evolution process during the pantograph lowering process of the motor train unit. The main function is to judge the arc reignition extinction condition in real time and calculate the arc resistance in real time according to the pantograph-catenary distance change and the voltage difference change on both sides of the pantograph, to assign the equivalent value of the calculated arc resistance RDF in the variable RLC module, and finally to simulate the pantograph-catenary arc development and change process and the overvoltage evolution process during the pantograph lowering process in the form of a series nonlinear resistance in the circuit.

The invention relates to the technical field of metallurgy, discloses a direct-current power supply arc stability control method based on a submerged arc furnace, and solves the problems of logic limitation and insufficient matching in the prior art. The instantaneous value and the change rate of the arc resistance are calculated by collecting arc voltage, arc current and electrode position signals in real time; constructing a cathode spot drift feature recognition model, and extracting a high-frequency fluctuation component of 10kHz-100kHz in the instantaneous value of the resistance to be matched with a preset feature spectrum so as to recognize a drift state; voltage and current compensation values are generated by adopting a model prediction control algorithm introducing a drift coefficient, and output parameters of the direct-current power supply are cooperatively adjusted and controlled in combination with multiple dimensions. The control method provided by the invention can accurately capture and inhibit the specific cathode spot drift of the direct current arc, reduce the arc fluctuation and arc breaking phenomena, improve the smelting stability, and reduce the invalid energy consumption and electrode loss, and is suitable for the arc stability control of the direct current power supply of the submerged arc furnace.

The application discloses a method and system for determining the swing direction of a pipeline welding torch, and belongs to the technical field of pipeline welding. The method is applied to a system for determining the swing direction of a pipeline welding torch, and the system comprises a current sensor, a voltage sensor, an angle sensor, a controller and a welding torch movement mechanism. The method comprises the following steps: the controller controls the welding torch movement mechanism to move simultaneously along the circumferential direction and the axial direction of the pipeline, acquires a first wire feeding speed, a first dry elongation, a first current value, a first voltage value and a first welding angle, determines a first arc resistance based on the first current value, the first voltage value and the first welding angle, determines a first arc resistance threshold value according to the first wire feeding speed, the first dry elongation, the first welding angle and an arc resistance threshold value calculation formula, and determines a target swing direction corresponding to the welding torch based on the first arc resistance and the first arc resistance threshold value. In the scheme, the controller controls the swing direction of the welding torch, which is beneficial to reducing welding errors and improving welding precision.

The invention discloses an Ag-WC electric contact material and a preparation method thereof, relates to the technical field of new materials in the electronic information industry, and solves the technical problems that an existing electric contact material is high in contact resistivity, short in anti-arc life, high in production cost and difficult to produce on a large scale. Comprising the following steps that WC powder is pretreated and then mixed with Ag powder to obtain composite powder, then the composite powder is laid in a mold to form a gradient structure, and the Ag-WC electric contact material is obtained through hot pressing sintering. The gradient nanometer enhancement technology is adopted, the microstructure of the material is improved through the synergistic effect of WC particle surface chemical plating and hot pressing sintering, the Ag-WC electric contact material low in resistivity and long in arc resistance service life is obtained, meanwhile, the Ag-WC electric contact material has the advantages of being simple in process, low in production cost, suitable for large-scale production and the like, the commercial requirement can be well met, and the application prospect is wide. The method is very suitable for preparing Ag-WC electric contact products.

This invention belongs to the field of transformers and discloses a broadband electromagnetic transient modeling method, system, device, and storage medium, including the following processes: Based on the transformer's geometric dimensions and magnetization characteristics, a frequency-varying magnetoresistive topology network is established; the broadband equivalent capacitance matrix and part of the inductance matrix of the transformer windings are extracted and integrated to construct a broadband admittance matrix of the windings; the geometric steady-state resistance of the plasma arc column is calculated, and a dynamic differential equation for the time-varying arc resistance of the plasma arc column is established; an augmented state-space equation describing the dynamic evolution of the transformer before and after a fault is constructed; the above are integrated to construct a time-domain multiphysics joint solution model, and the time-domain multiphysics joint solution model is verified by time-domain joint solution and frequency-domain impedance scanning to obtain a broadband electromagnetic transient model. This enables accurate simulation of complex broadband transient processes inside the transformer.

The utility model discloses a circuit breaker arc extinguishing cover with insulation protection mechanism, include: arc extinguishing cover cover, arc extinguishing cover cover inside one end inserts the arc extinguishing lining piece of setting, arc extinguishing cover cover inside the other end alternately inserts the arc extinguishing grid piece and mica spacer and is provided with, arc extinguishing cover cover lower part one end damping switches the mounting base, the utility model discloses through setting the arc extinguishing cover cover of DMC plastic material quality outside closure can play better insulation and arc resistance and can prevent arc spatter and external dust invasion, through setting the arc extinguishing lining piece of polyamide material can decompose and produce inert gas under the high temperature of arc, blows the arc and dilutes ionized gas, through setting the mica spacer of alternate separation can play the effect of insulation isolation, restricts arc diffusion range and forces arc circuitous extension path, so when using the safety is higher.

According to the direct current circuit rapid arc extinguishing thermal protector provided by the utility model, through the arrangement of the temperature sensing alloy, the first elastic member, the flash barrier, the magnet and the yoke, when the temperature sensing alloy senses that the ambient temperature is higher than a set value, the temperature sensing alloy becomes liquid, and at the moment, the first elastic member drives the connecting electrode to be far away from the pin; and the arc between the breakpoints is instantly and rapidly lengthened and snapped, so that the arc is rapidly extinguished. When the connecting electrode is far away from the pin, the connecting electrode loses the limit of the flash barrier, and the second elastic piece jacks the flash barrier upwards and places the flash barrier between the breakpoints, so that the arc is cut off, the voltage breakdown distance between the breakpoints is increased, and the arc extinguishing performance and the voltage resistance of the product are improved. The yoke is magnetized by the magnet so that magnetic fields are superposed and the magnetic field intensity is enhanced; in a magnetic field environment, the electric arc shifts towards a direction far away from a breakpoint under the action of magnetic field force, so that the electric arc is lengthened, the arc resistance is increased, the electric arc energy is reduced, and the purpose of arc quenching is achieved.

The invention discloses a machining device and method for an engine belt pulley, and relates to the technical field of belt pulley machining. The belt pulley comprises a mounting support and a belt pulley body, an auxiliary mechanism used in cooperation with the belt pulley body is arranged at the lower end of the mounting support and comprises a fixing sleeve frame, an arc-shaped abutting frame and an arc-shaped clamping plate, and a machining mechanism used in cooperation with the belt pulley body is arranged at the top end of the mounting support. Through the arrangement and use of the auxiliary mechanism, convenience is provided for adjusting the distance between the arc-shaped clamping plate and the corresponding arc-shaped abutting frame, so that convenience is provided for stable clamping and quick disassembly of the belt wheel body, stable development of drilling operation is guaranteed, a user can operate and use the device conveniently, and in addition, the working efficiency is improved. And convenience is provided for rotation and transposition of the two fixing sleeve frames, so that synchronous operation of hole drilling, deburring and feeding and discharging of the belt pulley body is achieved, and then the machining efficiency of the belt pulley body is effectively improved.

The invention belongs to the technical field of air conditioner compressor accessory manufacturing, and discloses a high-temperature anti-oxidation self-repairing terminal processing method which comprises the following specific steps: step 1, base material pretreatment: selecting a metal terminal base material with excellent conductivity, sequentially carrying out oil removal, rust removal, polishing treatment and surface oil stain, oxide layer and impurity removal, and then carrying out drying treatment to obtain a base material; and the clean and dry metal base material is obtained. The core advantages of ceramic particle adding and glue injection technologies are fused, the ceramic particles can provide reliable electrical insulation, arc resistance and high-temperature stability, the self-repairing sealant can achieve efficient sealing, moisture-proof, anti-corrosion and damping functions, the ceramic particles and the self-repairing sealant synergistically exert force, and the basic performance of the terminal is comprehensively improved; meanwhile, a self-repairing microcapsule system is introduced, when microcracks appear on the interface between the sealant or the ceramic particles and the base material, self-repairing microcapsules are broken, the core material repairing agent is released, a curing reaction occurs, and active repairing of the cracks is achieved.

This invention relates to the field of bridging strip production, and more particularly to a melamine-coated copper-tin-plated insulating arc-resistant bridging strip production system and method, comprising: a plating bath; an isolation mechanism disposed above the plating bath and isolating the plating bath from external oxygen; a pretreatment mechanism disposed inside the isolation mechanism and used for transferring the bridging strip and applying a flux; a plating mechanism disposed above the plating bath and used for tin plating the bridging strip, including a fixing component for fixing the bridging strip and a separation component disposed below the fixing component, wherein after the fixing component fixes the bridging strip, the separation component achieves tin plating on the surface of the metal terminals on the bridging strip; and a centrifugal mechanism disposed above the plating bath and used for centrifuging the bridging strip after it has been coated with tin, the centrifugal mechanism including a baffle component for blocking each terminal and a tin-retaining component disposed between the baffle component.