89results about How to "Not prone to vibration" patented technology

An AC chopper is connected between an AC power supply and a load circuit, comprising: a switch group, a voltage polarity detector and a switch control logic unit. Among them, the voltage polarity detector is connected to both ends of the AC power supply, and is used to detect the voltage polarity of the chopper input AC power supply when the switch is switched; the switch control logic unit receives the voltage polarity sent by the voltage polarity detector Signal, and send different control signals to the switch group according to the voltage polarity signal to control the state switching sequence of the switch group, and finally make the circuit switch between the freewheeling mode and the active mode. Because the switching method of the present invention is only when the circuit freewheeling mode and the active mode are converted, the state of the switch group is related to the input AC power voltage polarity signal, so the safety and reliability of the system are high; and, due to the method's The voltage polarity signal is fed back to the switch control logic unit discontinuously, so the system is not easy to generate oscillation.

The invention relates to the technical field of air-conditioners in electrical equipment, in particular to an air-conditioner outdoor motor control method, and aims at reducing noise and vibration production in the process of starting to a high rotation speed of an overall unit. The air-conditioner outdoor motor control method includes the following steps: S1, starting up: the rotation speed of an outdoor fan motor is improved to P (i) max from an actual rotation speed P (actual), and then the outdoor fan motor operates for 3minutes, wherein the P (actual) is equal to n P (i) max; and S2, the difference value delta T between temperature of indoor environment and set temperature of an indoor unit is judged. According to the air-conditioner outdoor motor control method, the rotation speed of the starting stage of the outdoor motor is set to be from low to high, and therefore the noise and the vibration are not easily produced in the process of the starting to the high rotation speed of the overall unit, and use comfortable sensation of users is improved.

The invention discloses a scraper device for a welded joint of a welded tube, which has a good using effect and long service life. The scraper device comprises a tool holder and a supporting seat, wherein a cross arm capable of moving vertically and a cylinder capable of driving the cross arm to move are arranged on the tool holder, a sliding seat capable of moving horizontally is arranged on the cross arm, a carriage capable of being vertically adjusted is arranged on the sliding seat, a planer tool, which is at an angle of 60-85 degrees to the top surface of the welded tube, is arranged on the carriage, the supporting seat is arranged under the planer tool, the supporting seat can be vertically adjusted, and a supporting plate is arranged at the top of the supporting seat.

The invention provides a processing method for copper target materials, comprising the following steps: mechanical processing is carried out on a copper workpiece for three times with gradually increasing accuracy, wherein spray cooling is adopted during the third mechanical processing, a full-wave clamp is adopted for fixing the copper workpiece in three times of mechanical processing processes, and stress release is carried out on the copper workpiece at least between the first mechanical processing and the second mechanical processing. The processing method for the copper target materials can prevent oxidation of copper in a mechanical processing process, and enable the copper target materials to obtain better consistency of surface grains and lower surface roughness.

The invention provides a processing method for copper target materials, comprising the following steps: a copper workpiece is processed through mechanical processing with gradually increasing accuracy for three times, wherein the copper workpiece is fixed by a full-wave clamp in three times of mechanical processing processes, and stress release is carried out on the copper workpiece at least between the first mechanical processing and the second mechanical processing. The copper target materials obtained through the processing method for the copper target materials has better consistency of surface grains and lower surface roughness.

The invention relates to a spring auxiliary support which comprises a base. A shaft hole is arranged in the middle of the base, a screw hole is arranged on the lateral face of the base, and an inner hexagon screw is arranged in the screw hole. A supporting shaft is movably arranged in the shaft hole, a spring is arranged between the bottom of the shaft hole and the supporting shaft, a key groove is arranged on the lateral face of the supporting shaft, and a flat gasket and a hexagon thin nut are arranged at the upper portion of the supporting shaft. The spring auxiliary support is stable in force control and does not easily generate vibration when parts are machined, and vibration lines on the machining surfaces are avoided.

The invention provides a low-pressure difference voltage stabilizer and a flash memory. The low-pressure difference voltage stabilizer comprises a first-grade error amplifier, a power tube, a first Miller capacitor and a load detection circuit, wherein the power tube is connected with the first-grade error amplifier and suitable for outputting an adjusted output signal applied on load; the first Miller capacitor is arranged between an output end of the first-grade error amplifier and an output end of the power tube; the load detection circuit is suitable for generating a control signal according to a current load situation of the load; the first-grade error amplifier comprises a gain adjusting unit used for positively adjusting the gain of the first-grade error amplifier according to the control signal. The low-pressure difference voltage stabilizer has good stability when being no-load or light-load.

The invention provides a specialized process mold for machining a pi-ring sealing washer and a manufacturing and use method, wherein the mold and the method belong to the field of heat exchanger sealing inner member processing. The process mold ensures processing precision of the pi-ring sealing washer. The specialized process mold comprises a two-step frustum, bolts and a pressure plate. The thickness of the base plate of the two-step frustum is not less than 60mm. The outer diameter of the base plate of the two-step frustum is larger than the designed diameter of the pi-ring sealing washer.The height of a boss is 7mm. The diameter of the boss is smaller than the actual dimension of the inner diameter of the pi-ring sealing washer by 3-15 [mu]m. Four bolt holes are uniformly distributedon the boss. The pressure plate is rectangular. The pressure feed end is a slope-shaped fillet. The pressure plate is internally provided with a hole. The mold is made of a steel plate. In machining of the pi-ring sealing washer, rough machining is performed on two planes, an inner circle and an external circle; then the pi-ring sealing gasket 1 is embedded into the process mold and is fixed by compressing screws 2 and the pressure plate 3; Semi-fine machining or fine machining is performed on the inner part and the outer part of the pi-ring. The specialized process mold and the manufacturingand use method have advantages of realizing simple manufacture and easy operation, ensuring machining of the qualified pi-ring sealing washer, effectively shortening production period and improving productivity.

The invention relates to a corrugated straight tube heat exchanger and a heat exchange method thereof. The corrugated straight tube heat exchanger is composed of an upper tube box, a shell-side cylinder and a lower tube box. The upper tube box is provided with a tube-side medium inlet. The lower tube box is provided with a tube-side medium outlet, and the two sides of the shell-side cylinder are respectively provided with a shell-side medium inlet and a shell-side medium outlet; A plurality of corrugated straight tubes are vertically arranged in the cylinder body as heat exchange tubes. The main body of the corrugated straight tubes is a structure of corrugated tube sections plus straight tube sections, that is, a cycle of waveform includes crest-straight-line segment-peak-trough; both ends of the corrugated straight tube A smooth straight tube is used for fixed connection with the upper and lower tube sheets, and the shell-side cylinder is provided with a plurality of square-hole jet plates along the height direction. The invention effectively improves the heat exchange efficiency, suppresses the formation of dirt, and solves the wear problem between the heat exchange tube and the baffle plate. In addition, it also has the advantages of convenient disassembly of the heat exchange tube, small equipment volume, and low cost.

The invention discloses a cranked plate hole-boring clamp. The cranked plate hole-boring clamp comprises a base, a first threaded rod, a second threaded rod, a floating self-positioning device and twofloating pressing devices. The base is provided with a first workpiece supporting surface and a second workpiece supporting surface, and the height of the second workpiece supporting surface is lessthan that of the first workpiece supporting surface. Each floating pressing device comprises a floating pressing plate and a pressing cushion block. The two sides of the lower end surface of each floating pressing plate are provided with pressing plate supporting parts correspondingly. The upper end faces of the floating pressing plates are provided with arc surface protrusions. The lower end faces of the pressing cushion blocks are provided with positioning grooves matched with the arc surface protrusions. The lower end of the first threaded rod sequentially penetrates through a locking nut,the corresponding pressing cushion block and the corresponding floating pressing plate and then is connected to the first workpiece supporting surface. The lower end of the second threaded rod sequentially penetrates through a locking nut, the corresponding pressing cushion block and the corresponding floating pressing plate and then is connected to the second workpiece supporting surface. The cranked plate hole-boring clam can clamp two to-be-machined workpieces at a time, and the machining precision of the workpieces can be improved.

The invention relates to a clamp for machining an annular casing of an aero-engine with a large length-diameter ratio. The clamp comprises a chassis, wherein a pressing device is arranged at the top end of the chassis and can press and fix an annular plate at the bottom end of the annular casing at the top end of the chassis; an inner supporting assembly is detachably and fixedly connected above the chassis and comprises a plurality of supporting blocks which are arranged in the circumferential direction; the outer side surfaces of the supporting blocks can be pressed and attached to the innerwall of the top of the annular casing; a cover plate is detachably and fixedly connected above the inner supporting assembly; and the bottom surface of the cover plate can be pressed and attached tothe top surface of the annular casing. According to the clamp, the annular casing with the large length-diameter ratio is clamped on a five-axis linkage turning and milling composite machining centerat a time, so that the machining of the inner surface and the outer surface of the annular casing can be completed, the vibration of a workpiece is small in the machining process, and the thin wall ofthe annular casing is not easy to deform.

The invention discloses a deep hole machining ejector drill. The deep hole machining ejector drill comprises a drill body, two tool chucks and a hollow connecting thread, and is skilful in structure. Tool bits are overlapped in a staggered way along the central line of a lower end face, two tool chuck mounting grooves are unequal in lengths, and the length of a longer tool chuck mounting groove is 0.5-1 millimeter larger than the radius of the drill body. During working, cutting edges cover an entire machining surface, and the machining surface is flat. Since a plurality of cutting edges are adopted for cutting, reliable chip breaking is ensured, and scrap iron is fine and easy to discharge and is prevented from blocking. Acting force produced in a cutting process is shared by a plurality of tool bits, thereby prolonging the service lives of the tool bits. The aim of controlling the water current is fulfilled by using a current limiting plate, cutting edges can be cooled fully, and the service lives of the tool bits are prolonged. Since cutting edges of the drill bits are replaced by easily-replaceable parts such as tool chucks and tool bits, fittings can be replaced, tool bodies are protected, and the production cost is reduced. Since drill body is provided with two vanes which are uniformly distributed around the central axis of the drill body, radial force acting on two symmetrical cutting edges in a machining process is counteracted, the drill body is prevented from vibrating, the surface accuracy of machined holes is increased, and the quality of a machined product is enhanced.

The invention provides a clamping structure of a thin-walled piece. The clamping structure is provided with a base platform and a cover plate. The base platform comprises a base and a boss protrudingupwards from the center of the base. The boss is fixed to the cover plate through a fixing device penetrating through the cover plate to extend into the boss. Clamping of the thin-walled piece is achieved in a vertical clamping manner, the thin-walled piece cannot vibrate in the machining process, and therefore the flatness of the machined thin-walled piece can be guaranteed. By the adoption of the clamping method of the clamping structure of the thin-walled piece, the thin-walled piece is arranged between the boss and the cover plate, rapid clamping can be achieved, the thin-walled piece canbe effectively prevented from twisting and deforming in the machining process, and machining requirements of semiconductor parts can be better met.

The invention discloses a fixture for machining a shroud of an engine blade and a machining method of the engine blade, and belongs to the technical field of aero-engines. The fixture for machining the shroud of the engine blade comprises a first supporting block and a second supporting block which are oppositely arranged, wherein the first supporting block and the second supporting block jointlylimit the position, close to the blade shroud, of a blade body. According to the fixture, an original tip is replaced with a fake tip to clamp and fix the blade, the distance between the shroud and the fake tip is small, the milling rigidity of the blade shroud is good, and the influence brought by cutter relieving and vibration is reduced; meanwhile, the problems that the blade is extruded when the blade shroud is axially located through the tip, and consequently a part deforms and deviates from a locating surface are solved; and the blade shroud has consistency in machining and measuring technical objectives, so that the detection precision is improved, and the machining quality of the blade shroud is reversely ensured.

Provided is a building hoist stand column port cutting fixture and a machining method of a stand column port. The cutting fixture is arranged on a guide track of a body of a lathe. The cutting fixture is provided with a fixture seat (10) which is matched with the guide track of the lathe, a shaft sleeve (5) which is fixedly connected with the fixture seat (10), a first bearing (4), a second bearing (6), hollow rotating shafts (7) which are arranged inside the first bearing (4) and the second bearing (6), flange plates (2) which are fixedly connected with one ends of the hollow rotating shafts (7), and self-centering chucks (1) which are connected with the flange plates (2) and are coaxial with a chuck of the lathe. The first bearing (4) and the second bearing (6) are arranged at two end portions of the shaft sleeve (5). The machining method includes the following steps: mounting the cutting fixture on the guide track of the body of the lathe; enabling a stand column to penetrate through the hollow rotating shafts of the cutting fixture, clamping and fixing one end of the stand column through the chuck of the lathe, clamping and fixing the portion close to a cutting tool through the self-centering chucks; and cutting the stand column port.

The invention relates to a baffling element of a pipe shell type heat exchanger and a working method thereof. The baffling element of the pipe shell type heat exchanger comprises a square hole baffle and a casing pipe fixing plate. The square hole baffle is transversely arranged in a shell of the pipe shell type heat exchanger and used for fixing a corrugated pipe. The square hole baffle is a circular hole plate matched with the inner diameter of the shell, and is uniformly provided with a plurality of square through holes. The casing pipe fixing plate is embedded into the square through holes, and the inner side of the casing pipe fixing plate is tangent to the wave crest portion of the corrugated pipe. By adopting the square hole baffle, the casing pipe fixing plate is arranged in the square through holes for fixing the corrugated pipe, the heat exchange effect of the heat exchanger shell pass can be effectively improved, the fluid turbulent degree is enhanced, vibration of the heat exchanger is reduced, and the problem of abrasion caused between a corrugated pipe bundle and a baffle plate is solved.

The invention discloses a forward and reverse tooth grinding device. The device comprises a numerical control index head, a grinding mechanism and a grinding motor. The numerical control index head is connected with the grinding mechanism through a turning-connection fixing plate. The turning-connection fixing plate is provided with a motor fixing plate. The grinding motor is installed on the motor fixing plate. The grinding motor is in transmission connection with the grinding mechanism. The invention further discloses a full-automatic numerical control screw tooth grinding machine. The full-automatic numerical control screw tooth grinding machine comprises a lathe body, the tooth grinding device and a chuck, wherein the lathe body is provided with a middle tray and a guide rail. The tooth grinding device is the forward and reverse tooth grinding device. The tooth grinding device is arranged at one end of the middle tray, and the other end of the middle tray is further provided with a follow-rest preventing workpieces from vibrating. The tooth grinding device and the tooth grinding machine can easily achieve precise angle adjustment, forward and reverse grinding is conducted, speed regulation is convenient, the device and the machine are suitable for machining of various screw tooth types, and machining precision is greatly improved. The screw tooth grinding machine can achieve automatic compensation according to the abrasion degree of a grinding tool, the machine utilization rate is greatly increased, cyclic work of machines is guaranteed, and production efficiency is improved.

The invention discloses a flue gas waste heat recycling boiler with a variable space and variable flow fields. The flue gas waste heat recycling boiler adopts four heat absorption sections, wherein a low-temperature heat absorption section adopts a low-temperature near-dew-point anti-corrosion flue gas high-efficiency recycling and energy-saving heat exchange YHSP device, so that the inlet water temperature of a medium-temperature heat absorption section is increased by the low-temperature heat absorption section, and the device does not generate acid dew corrosion under the working condition that boiler load continuously changes. Besides, the heat exchange equipment of the boiler adopts SP high-efficiency heat exchange tubes, so that the good strengthened heat transfer effect is achieved, pressure drop is reduced when gas flow velocity is guaranteed, vibration does not likely occur, and scale inhibition and tube explosion prevention are relatively high. Compared with a conventional waste heat recycling device, the volume of the boiler is reduced by 20-30%, and the weight of the boiler is reduced by 30-40%, so that the low-temperature waste heat recycling, energy conservation and emission reduction of the flue gas are realized.

The invention provides a driving system and method for dynamically adjusting gate pole voltage. The driving system for dynamically adjusting the gate pole voltage comprises a switching device module;an inter-electrode voltage detection module connected with the switching device module and used for detecting the inter-electrode voltage of a switching device in the switching device module; an interelectrode voltage analysis module connected with the interelectrode voltage detection module and used for analyzing the interelectrode voltage to generate an adjustment signal; and a voltage adjustingmodule respectively connected with the inter-electrode voltage analysis module and the switching device module, and used for dynamically adjusting the gate voltage of the switching device according to the adjusting signal. By detecting the Vce, the gate voltage can be adjusted in real time, so that the on-state loss of the switching device during normal operation is reduced.

The invention relates to the technical field of shielding doors, in particular to a single-rail double-opening shielding door which comprises a fixed door body, a guide rail, two movable door bodies, a guide assembly and a driving assembly. The fixed door body is provided with a passing area for people to pass through; the guide rail is arranged on one side of the fixed door body and located at the bottom end of the passing area; the two movable door bodies are respectively arranged on the guide rails in a sliding manner; the guide assembly comprises a first guide part and a second guide part in sliding fit with the first guide part, the first guide part is arranged at the top end of the movable door body, and the second guide part is arranged on one side of the fixed door body and is parallel to the guide rail; and the driving assembly is used for driving the two movable door bodies to be close to or away from each other. The guide rail and the guide assembly are arranged at the bottom end and the top end of the movable door body respectively and used for guiding the movable door body to slide, and the movable door body slides more stably.