17results about How to "Keep constant" patented technology

The invention discloses an active disturbance rejection control method for suppressing subsynchronous oscillation of a doubly-fed wind turbine generator, which relates to the technical field of power system control and comprises the following steps: estimating subsynchronous current disturbance of a first controlled object in real time through a first extended state observer; using a first nonlinear state error feedback control strategy to perform feedback control according to the disturbance estimated by the extended state observer; the rotor current is kept constant, and subsynchronous oscillation is suppressed. According to the method, the sub-synchronous current disturbance of the controlled object is estimated in real time through the extended state observer, accurate estimation of the sub-synchronous current disturbance on the rotor side of the doubly-fed wind turbine generator is achieved, effective feedback control can be conducted on the estimated disturbance by adopting a nonlinear state error feedback control strategy, and therefore the disturbance disturbance can be effectively controlled. The feedback control output variable is calculated through the optimal control function and the current feedback error, real-time compensation of disturbance is achieved, the dynamic response speed of the system is increased, and the disturbance suppression capacity of the system is enhanced.

The invention provides a new energy range-extended heavy truck energy distribution method based on SOC and driving power, which is applied to a hybrid mode of a hybrid new energy range-extended heavy truck and comprises the following steps: acquiring a vehicle state of the hybrid new energy range-extended heavy truck, historical driving power data and a current SOC of a battery module; determining average driving power based on the historical driving power data; determining a first weighting coefficient based on the current SOC, and determining a second weighting coefficient based on the vehicle state; determining compensation driving power based on the first weighting coefficient and the second weighting coefficient; and determining the required driving power based on the average driving power and the compensation driving power. According to the scheme, the vehicle state and the SOC of the new energy extended-range heavy truck are considered in the hybrid mode, the required generation power is determined in real time, energy distribution is carried out, and the dynamic property and the fuel economy of the system are guaranteed.

The invention provides a low-loss substrate integrated transmission line structure and a preparation method thereof.The low-loss substrate integrated transmission line structure comprises a first substrate, a circuit penetrating in the length direction of the first substrate, metal layers arranged on the upper side and the lower side of the first substrate and a second substrate arranged above the metal layers on the two sides; the first substrate is provided with a plurality of air holes penetrating in the height direction of the first substrate, the air holes are evenly divided into two groups to be arranged on the two sides of the circuit, and every two adjacent air holes are arranged at equal intervals. The circuit adopts a periodic line width structure; in the first substrate, the outer sides of the two groups of air holes are respectively provided with a group of metal holes penetrating along the height direction of the first substrate to form shielding. The dielectric loss and the reflection loss of the substrate are reduced, the overall performance of the transmission line is improved, a more reliable solution is provided for high-frequency signal transmission, and wide application prospects are achieved.

The utility model discloses a kind of semiconductor constant-temperature wine decanter, belong to wine decanter technical field, including wine storage shell, its inside is provided with wine storage heat preservation groove, wine storage heat preservation groove bottom is provided with temperature-guiding cold aluminium seat, the cold end of semiconductor refrigeration sheet is abutted in temperature-guiding cold aluminium seat, the hot end of semiconductor refrigeration sheet is abutted on radiating fin, radiating fin is connected in fan cover, fan cover is provided with radiating fan, wine storage shell bottom is provided with a plurality of first radiating holes, radiating fan is towards a plurality of first radiating holes, wine storage shell bottom is provided with support seat. The utility model utilizes semiconductor refrigeration sheet to combine wine storage heat preservation groove, ensure that internal temperature is constant and is not affected, this structure will wine bottle be placed in wine storage heat preservation groove, guarantee the constant temperature of wine in bottle, so that under constant-temperature environment, volatile speed of aroma molecule is relatively stable, can make grape wine continuously, stably release various aroma, improve drinking experience.

The present invention provides a film capacitor core package overvoltage test device and method, belonging to the field of capacitor core package testing technology. A film capacitor core package overvoltage test device includes a shell, a test cavity, a heating unit, an operation panel, a protective door, a placement plate, a positioning part, a threading groove, a mounting groove, a rotating rod, a toggle part and a resistance piece; the present invention drives a semicircular resistance plate through a rotating rod to tightly resist the lead wire during the test to seal the threading groove, maintain a constant temperature in the test cavity and prevent test errors, and releases the resistance on the lead wire after the test so as to easily remove the capacitor core package and separate the positioning plate, thereby avoiding the problem of difficulty in removing the capacitor core package due to adhesion of the molten material. Such a design makes the entire test process smoother and improves the test efficiency.

The utility model discloses a battery pressure maintaining tool which comprises a pressing plate and two chucks, the pressing plate is provided with two side edges which are arranged back to back, and the two side edges of the pressing plate are respectively provided with an assembling rod in a protruding mode. The two chucks are installed on the assembling rods on the two side edges of the pressing plate respectively, each chuck comprises a clamping plate and a movable seat, the movable seats are movably arranged on the assembling rods, the movable seats of the two chucks are oppositely arranged, the clamping plate is arranged on the surface, facing the movable seat of the other chuck, of the movable seat of one chuck in a protruding mode, and the clamping plate is arranged on the surface of the movable seat of the other chuck. The clamping plates of the two chucks and the pressing plate are arranged at intervals and define an assembly space, and the assembly space is used for installing a to-be-detected battery. According to the utility model, deformation caused by bulging of the top cover in charging detection is avoided, and the accuracy of air tightness detection is ensured.

The application discloses a vertical numerical control lathe machining center, and relates to the technical field of metal machining. A vertical fixing frame is arranged at the top of a vertical machining table, a horizontal fixing frame is slidably connected to the top of the vertical fixing frame, reciprocating electric slide rails are connected to one end of the vertical fixing frame and the horizontal fixing frame, one end of one of the reciprocating electric slide rails is provided with a load bearing positioning frame through a slide rail seat, a rotating motor is arranged on the top of the load bearing positioning frame through a motor seat, a fixed bearing limiting table is arranged on the output shaft of the rotating motor, a plurality of pressing and clamping electric slide rails are arranged on the top of the fixed bearing limiting table at equal intervals, and pressing and clamping closing blocks are arranged on the top of the pressing and clamping electric slide rails through slide rail seats. The application effectively solves the problem that only a single tool bit is used for production in the prior art, the machine needs to be stopped and the tool bit needs to be replaced when different production is carried out, and the tool bit cannot be automatically adjusted during production. Through linkage and cooperation of multiple tool bits, the number of tool bit replacement is reduced.

The technical scheme of the invention discloses an experimental device for determining the forming limit of a light alloy metal plate and a pre-tightening force applying method. The experimental device comprises a male die, the female die comprises an upper female die body and a lower female die body, and the metal plate is located between the blank holder and the upper female die body; the upper female die is made of aluminum alloy and used for shortening the heating time of the upper female die and conducting heat to the metal plate so as to guarantee the temperature consistency of the metal plate and the upper female die. According to the forming limit determination experimental device, a traditional female die is divided into the upper female die and the lower female die, the upper female die is made of aluminum alloy, the overall weight of the device is reduced, meanwhile, the preheating time of the female die making contact with a metal plate is shortened, the metal plate can be effectively kept at the specified temperature constantly, the hot forming limit is accurately measured, and the working efficiency is improved. The experiment efficiency is improved. And meanwhile, the overall structure is small in size, suitable for being applied to small-size metal plates and convenient to disassemble, assemble, carry and carry.

The utility model discloses a fixing frame for an electronic product. The fixing frame comprises a bottom cover and a clamping assembly installed on the bottom cover. The clamping assembly comprises a front cover and a sliding assembly sliding between the front cover and the bottom cover. The sliding assembly comprises a sliding plate and a movable frame sliding on one side of the sliding plate. A locking piece is further arranged between the front cover and the bottom cover, and the locking piece is pushed to be disengaged from the sliding plate by pressing the locking piece so that locking of the sliding assembly by the locking piece can be relieved. One end of the movable frame outside the sliding plate is connected with the first clamping plate through a shaft pin; one end of the front cover far away from the sliding assembly is connected with the second clamping plate through a shaft pin. On the basis, the mobile phone can be clamped, the tablet computer can also be clamped, and therefore the defects in the prior art are overcome. When the locking piece is separated from the sliding plate, unlocking of the sliding assembly is completed so that the clamping range of the clamping assembly can be adjusted, and meanwhile after the locking piece makes contact with the sliding plate, locking of the sliding assembly is completed so that it can be guaranteed that the clamping range is constant.

The invention discloses a long-baseline deep-sea binocular measurement camera which comprises a control cabin, a deep-sea camera and a double-rod supporting assembly. The control cabin is used for camera control and a storage circuit; pressure-resistant fastening assemblies are symmetrically mounted at the two ends of the control cabin; the number of the deep sea cameras is two. The two deep sea cameras are installed at the ends, away from the control cabin, of the two pressure-resistant fastening assemblies correspondingly. The optical axes of the two deep sea cameras are located on the same plane, and the included angle between the two optical axes is 180 degrees to 2 alpha. The two deep sea cameras are electrically connected with the control cabin; the double-rod supporting assembly is installed between the two deep sea cameras. According to the invention, the binocular measurement camera has a long base line, can obtain a large public field of view, is small in deformation and stable in structure in a deep sea high-pressure environment, guarantees the constancy of internal and external parameters of the binocular measurement camera in the measurement process, and improves the measurement precision and accuracy.

The application belongs to the technical field of lighting lamps, and particularly relates to a three-dimensional full-space wireless sliding table lamp with anti-dazzle and eye protection, which comprises a supporting frame, a lifting mechanism, a horizontal adjusting mechanism, a wireless sliding connecting assembly, a balance structure and a bidirectional light-emitting anti-dazzle assembly. A placing seat is fixedly connected to the bottom of the supporting frame, and a first sliding groove is formed in the vertical direction in the middle of the supporting frame. The lifting mechanism comprises an adjusting plate arranged at the end of a fixed cylinder, and a positioning rail is fixedly connected to the outer wall of the adjusting plate. The adjusting plate is clamped on the inner wall of the first sliding groove through the positioning rail. The LED upper lamp plate with a front inclination angle is arranged to effectively supplement the background light of the working environment. The bidirectional light-emitting mode significantly reduces the brightness ratio between the center of the working area and the surrounding environment, reduces the light-dark contrast, relieves the visual fatigue caused by frequent pupil adjustment of the human eye, and prevents myopia from the optical and physical aspects.

The utility model discloses a strip cutting machine for fabric cutting, and relates to the related technical field of fabric processing. The cutting device comprises a cutting table, a side plate, a positioning assembly, a linear module and a cutting motor, the side plate is fixed to one side face of the cutting table, the upper portion of the side plate exceeds the height of the cutting table, and symmetrically-distributed positioning rods are fixed to the face, facing the cutting table, of the upper portion of the side plate; a first cutting groove is formed in the transverse central axis of the cutting table in a penetrating mode, and positioning assemblies distributed at equal intervals are further arranged on the cutting table. The positioning assembly, the linear module, the cutting motor, the cutting table, the side plate and the positioning rod are arranged, so that the problem that the follow-up slitting position deviates due to the fact that fabric on a cutting route is accumulated when the fabric is cut into strips is solved; and during batch strip cutting, the cutting width of each time needs to be frequently and continuously adjusted, and manual adjustment is time-consuming, labor-consuming and inaccurate.

The utility model relates to anti -static board processing equipment technical field, and disclose a kind of anti -static board's leveling equipment, including input platform, preheating passage is installed on the input platform, the conveying front end of the input platform is provided with leveling mechanism, leveling mechanism includes the upper pressing plate and lower pressing plate of parallel arrangement, upper pressing plate outside is provided with portal frame, portal frame is installed with the cylinder of pushing upper pressing plate lift adjustment;The side of upper pressing plate and lower pressing plate is commonly provided with position monitoring assembly, and conveying adjustment component is arranged between upper pressing plate and lower pressing plate.The leveling equipment of the anti -static board, anti -static board is first conveyed to preheating passage by input platform and preliminarily heated, then enter the surface of lower pressing plate of leveling mechanism;At this time, grating sensor on two groups of L-shaped frame real-time monitoring board position, electric telescopic rod in adjusting groove pushes out U-shaped roller frame, so that friction roller is contacted with board through switching groove, servo motor drives friction roller rotation and drives board fine adjustment to accurate position.

The utility model provides a kind of windproof cassette portable gas oven, it is related to barbecue stove technical field, the windproof cassette portable gas oven includes furnace body and furnace cover assembly, furnace cover assembly includes connecting pedestal, two windproof side walls, movable cover and locking mechanism;Connecting pedestal is fixed in the rear of furnace body;The rear of two windproof side walls is respectively rotatably connected with the two sides of connecting pedestal;The rear of movable cover is rotatably connected with two windproof side walls respectively, and the front of movable cover is equipped with handle for opening or closing movable cover;Locking mechanism is used to make movable cover and two windproof side walls mutually locked or separated.When locking, three form a rigid whole.The whole furnace cover assembly is whole overturn with the connecting pedestal of rear as axis center.When unlocking locking mechanism, windproof side wall keeps in closed position, and movable cover is opened alone.No need to open the whole furnace cover completely, so as to reduce the instantaneous loss of heat in furnace, maintain the constant of cooking temperature.

The invention discloses a turning and milling combined machining center for camshaft machining, and relates to the technical field of turning and milling combined machining centers. The turning and milling combined machining center for camshaft machining comprises a shell arranged on a turning and milling combined machining center body, a three-jaw self-centering chuck assembly and a cutter assembly, a center frame assembly is arranged at the bottom of the shell, and the center frame assembly comprises two symmetrically-arranged guide rails fixedly connected to the bottom of the shell; a hollow moving cover is slidably connected to the guide rail, a V-shaped groove is formed in the top of the moving cover, and an air cylinder is fixedly connected to the side wall of the shell. According to the turning and milling combined machining center for cam shaft machining, it can be guaranteed that the clamping force of the multiple balls on the cam shaft is constant, meanwhile, through arrangement of bristles, chippings can be prevented from making contact with the balls, air blowing cleaning can be conducted on the chippings on the surfaces of the balls and the cam shaft, the chippings are blown away outwards, the supporting effect of the balls is guaranteed, and the service life of the cam shaft is prolonged. And the processing quality is further ensured.

The present invention relates to the technical field of tube inner surface polishing, and specifically to a non-magnetic concentric variable diameter tube inner surface magnetic particle grinding device and method. It includes a gear rotating mechanism, a sliding variable diameter mechanism, a lathe, a magnet, a distance sensor and a PLC control system; the lathe is provided with a spindle box, a slide box I and a slide box II in sequence, and the two ends of the workpiece are respectively clamped on a triangular chuck I connected to the spindle box and a triangular chuck II connected to the slide box II, and the gear rotating mechanism is installed on the slide box I; the sliding variable diameter mechanism is installed on the inner end face of the large gear, the sliding variable diameter mechanism is a retractable structure, the magnet is installed at the end of the sliding variable diameter mechanism, and the large gear drives the magnet to rotate to form a rotating magnetic field; the distance sensor is installed on the magnet, and the PLC control system is electrically connected to the distance sensor and the sliding variable diameter mechanism. It has high processing efficiency and good precision, and can be widely used in magnetic particle grinding and polishing of the inner surface of non-magnetic concentric variable diameter tubes.

This utility model belongs to the field of water tank technology, specifically relating to a vertical segmented temperature-controlled constant pressure water tank, comprising: a tank body, an inlet pipe at the top of the tank body, multiple water flow baffles inside the tank body, multiple round holes on the water flow baffles, an electric heater at the top of the tank body, temperature sensors on both sides of the water flow baffles, and multiple water outlet pipes on the side wall of the tank body, with the water flow baffles located between adjacent water outlet pipes, all of which are connected to a water supply pipe. Due to the action of the water flow baffles, water cannot easily flow between different locations. When the hot water in a certain layer is insufficient, water will be gradually replenished from nearby water layers through the round holes, effectively ensuring a constant water temperature with minimal temperature fluctuations, effectively solving the problem of sudden changes in water temperature.