48results about How to "Small transmission power" patented technology

A method of allocating a channel in a wireless local area network (WLAN) system is provided. The method includes generating a MAC protocol data unit (MPDU) to be transmitted to a target station (STA), generating a PLCP protocol data unit (PPDU) by attaching a physical layer convergence procedure (PLCP) header to the MPDU, and transmitting the PPDU to the STA, wherein the PLCP header includes channel allocation information for transmission of the PPDU.

A slot antenna includes an insulation substrate, a metal layer provided on the insulation substrate, a slot formed in the metal layer, and a feeding part connected to the metal layer. The slot is symmetric with respect to a centerline. When an x-y coordinate system is defined on the metal layer so that the y-axis is the symmetric line, the origin is the center of the slot antenna, and the x-axis through the origin is perpendicular to the y-axis, the width of the slot in the direction of the y-axis increasing in proportion to the absolute value of the x-axis.

The invention relates to a high-efficiency energy-saving threshing air separation new process and equipment, and particularly relates to a threshing redrying process which carries out air separation on tobacco flakes and tobacco stalks and belongs to a tobacco processing industry and the technical field of equipment. The threshing redrying process sequentially comprises the following steps of: a scraping plate feeding machine, a bin type feeding machine, a proportional distributor, a first-level threshing machine set, a conveying belt, a first-level air separation machine set (double-bin air separator), a stalky leaf conveying belt, a second-level threshing machine set, the conveying belt, a second-level air separation machine set (three-bin air separator), the stalky leaf conveying belt, a third-level threshing machine set, the conveying belt, a third-level air separation machine set (three-bin air separator), the stalky leaf conveying belt, a fourth-level threshing machine set, the conveying belt and a fourth-level air separation machine set (three-bin air separator), wherein the first-level air separation machine set is provided with an air pressure type double-bin air separator which only separates qualified tobacco flakes; and the second-level air separation machine set, the third-level air separation machine set and the fourth-level air separation machine set are provided with air pressure type three-bin air separators which can separate qualified tobacco flakes and tobacco stalks.

A transmitter for transmitting signals to targets and a receiver for receiving signals reflected from targets are included. The transmitter outputs CW signals for detecting direction and velocity of the target. The receiver performs: a function of receiving signals reflected from targets with a plurality of receiving antennas at the same time as transmitting from the transmitter, and performing spectral analysis with respect to receiving signals to thereby classify them by velocity component; a function of correlating signals of the receiving antenna systems; a function of integrating the signals correlation-processed; and a function of obtaining phase fronts of signals made incident on an antenna face from the phase differences of signals between receiving antennas, and performing two-dimensional FFT to the outputs to thereby measure the direction and velocity of the target.

The invention provides a transversely cutting device of a paper cutter with double flying knives and a method for adjusting the length and the squareness of cut paper. The transversely cutting device comprises stands and a double-rotary knife roll, wherein both ends of the double-rotary knife roll are arranged on the stands by bearing supports, one bearing support is articulated with the stand at one side by a rotating axle, a knife roll adjusting mechanism is arranged on the stand at the other side, and a revolving knife hold-down mechanism is arranged on a connecting plate between the stand at one side and the stand at the other side, and articulated with the bearing supports by adjustable post rods and connecting pieces. The positions of the adjustable post rods are adjusted, which enables the bearing supports at both ends of the knife roll, the stand at both sides to be compressed or loosened. The speed ratio of the peripheral speed of the knife roll to the running line speed of paper is adjusted for adjusting the length of the cut paper. When cutting the paper, the knife roll rotates at a uniform speed all the time. A method that the angle between an axial line of the knife roll and the running direction of the paper is adjusted is adopted to ensure the cutting squareness. The invention can greatly decrease the installed capacity of an electric motor of the transversely cutting device and lower the complexity and the cost of manufacture.

The invention discloses a kind of folder meshwork vacuum roller former for high speed tissue paper machine. The former realizes two-sided dehydration depending on mental efforts and vacuum suction procreated by high speed circumvolving of vacuum roller. Thanks to fixing pressure pulse extruding device on meshwork of formation arc zone, brace procreated by the meshwork can also make slurry dewater vastly. The former is characterized in that the dewatering zone is divided into three areas including centrifugal, vacuum and centrifugal pressure dehydration, which realizes step dewatering and efficient forming. The former including guide roll, vacuum forming roll, outer-mesh, inner-mesh, flexible pressure pulse extruding device on meshwork, air compartment etc. It makes slurry to dewater and form efficiently without agitating. Because of the balanced property of two-sided dewatering nature, sheet uniformity and two-side compatibility are good. With simple structure, low drive power and good reliability, the former is applicable on tissue paper machine with high speed and low range.

The invention relates to an energy-efficient threshing and pneumatic separating process and device. The energy-efficient threshing and pneumatic separating process is characterized in that a two-bin pneumatic separator is adopted for a first stage pneumatic separating unit; three-bin pneumatic separators are adopted for a second stage pneumatic separating unit, a third stage pneumatic separating unit and a fourth stage pneumatic separating unit; and the strips yield of the first stage pneumatic separating unit, the second stage pneumatic separating unit, the third stage pneumatic separating unit and the fourth stage pneumatic separating unit is respectively 45-64%, 15-30%, 10-15% and 5-15%. The strips yield is decreased gradually so that the device dimensions and capacities of the second stage pneumatic separating unit, the third stage pneumatic separating unit and the fourth stage pneumatic separating unit are decreased gradually, and the physical dimension of the fourth stage pneumatic separating unit is 1 / 2 that of the first stage pneumatic separating unit. The purpose of separating qualified tobacco flakes and tobacco stalks is achieved through the technological process, adjustment of the pressure balancing surface position in separation bins of the two-bin pneumatic separator and each three-bin pneumatic separator of the first to fourth stage pneumatic separating units and speed adjustment of a conveying mesh belt.

The invention discloses a sandwich vacuum roller former for a high-speed tissue paper machine. The former relies on the centrifugal force and vacuum suction force generated by the high-speed rotation of the vacuum roller to dehydrate both sides. The wire part of the forming area is equipped with a pressure pulse extrusion device, so the tension generated by the wire part can also dehydrate the pulp in large quantities. The feature of the former is that the dehydration area is divided into three areas: centrifugal dehydration, vacuum dehydration, and centrifugal extrusion dehydration, dehydration in sections, and efficient forming. The former includes guide rollers, large-diameter vacuum forming rollers, outer nets, inner nets, flexible pressure pulse extrusion devices in the net part, air chambers and other devices, which can not only make the pulp flow efficient dehydration and forming without disturbance, but also Due to the balanced dehydration performance on both sides of the pulp, the formed paper web has better uniformity and consistency on both sides. The former has simple structure, low transmission power and good reliability, and is more suitable for use on high-speed and low-weight tissue tissue machines.

The invention relates to a vertical axis wind turbine with a blade angle varying along with wind direction and wind velocity, which comprises a control system, a planetary gearbox, a fixed axis gearbox, a transmission shaft, a main support, an upper cantilever beam, a lower cantilever beam, a bearing pedestal, a bearing, blades, a vertical axis, a tower and the like, wherein the vertical axis is connected with the tower through the bearing and the bearing pedestal; the main support is sleeved outside the vertical axis and the bearing pedestal, so that the middle part of the main support is connected with the middle part of the vertical axis, and the top end of the main support and the head of the vertical axis are connected with the bottom of the planetary gearbox; the control system is connected with the top of the planetary gearbox through the bearing pedestal; the root part and the end part of the upper cantilever beam are respectively connected with the side face of the planetary gearbox and the side face of the fixed axis gearbox, and the root part and the end part of the lower cantilever beam are respectively connected with the lower end of the main support and the bearing pedestal; both ends of the transmission shaft are respectively connected with the planetary gearbox and the fixed axis gearbox; and the blades are respectively connected with the fixed axis gearbox and the bearing pedestal so that output power maintains near the rated power value.

A lifting device is composed of a lifting platform, a counterweight, a set of symmetrically arranged lifting platform transmission devices, a toothed belt transmission device arranged on the lifting platform, and a hanging spindle for hoisting empty and full pipes. The lifting platform transmission device and the toothed belt transmission device are respectively driven by motors; the lifting platform is composed of a lifting arm and a set of transverse rails installed by the lifting arm. Compared with the existing technology, the structure is simpler and the operation is more reliable; the problem of counterweight balance between the lifting platform and the full pipe is solved; the transmission power is reduced; the load and wear of the transmission parts are reduced; the level adjustment element is set to adjust the lifting platform The levelness; improve the operational reliability of the unit, and can also realize the lifting and the exchange of empty and full pipes according to the requirements of displacement and displacement speed.

A device for continuous carbon felt impregnation comprises a frame, a carrier shaft, a feed roll shaft, an impregnation tank and a discharge roll shaft, wherein the carrier shaft, the feed roll shaft, the impregnation tank and the discharge roll shaft are sequentially arranged on the frame. A drive motor is arranged between the feed roll shaft and the discharge roll shaft, the drive motor is respectively connected with the feed roll shaft and the discharge roll shaft through a transmission device, impregnation roll shaft brackets are disposed inside two ends of the impregnation tank respectively, an impregnation roll shaft is arranged on the impregnation roll shaft brackets, and a slanting guide board is disposed below the discharge roll shaft and connected with the impregnation tank. Thedevice can be used for continuous, mechanical and automatic impregnation for carbon felts, labor intensity can be reduced greatly, impregnation efficiency can be improved, and product quality stability can be improved.

The invention relates to a method for operating a fuel pump in order to guide fuel from the fuel container of an internal combustion engine, wherein the electric energy, which is in the form of pulses, is periodically guided to the fuel pump and the duration of the pulses is controlled according to the fuel required by the internal combustion engine. The frequency of the pulses is controlled in such a manner that, in the event of low pump capacity of the fuel pump, the frequency is controlled to a higher level than in the even of a high pump capacity.

The invention discloses an energy-saving and environment-friendly high-energy screw press. The energy-saving and environment-friendly high-energy screw press comprises a machine body, a circular guiderail, a circular guide rail cover, a spherical bearing seat, a screw rod, a bearing fixed inner body, a thrust ball bearing, a convex cover, an O-shaped sealing ring, a bearing outer body, a lower sealing ring, a lower sealing ring cover, a deep groove ball bearing, a deep groove ball bearing cover, a main motor, a driving pulley, a driven pulley-type flywheel, a multi-layer positioning plate, aroller bearing seat, a pushing self-aligning roller bearing, an inner sealing ring, a friction clutch disc, a friction block, a pneumatic conical separation-reunion piston, a conical cylinder body, aguide screw rod, a cylinder body fastening nut, an up-down adjusting bolt, a back tightening nut, a copper nut, a top surface baffle plate, a sliding block, a lifting frame, a lifting rod, a return stroke lifting cylinder and an upper sealing ring. According to the energy-saving and environment-friendly high-energy screw press, the output energy is high, the transmission power is small, power is saved, energy saving is remarkable, the return stroke is quick, the production efficiency is high, the anti-bias load ability is high, multi-position die forging is achieved, environmental protection is achieved, the service life is long, and the safety of the whole machine is ensured; and the energy-saving and environment-friendly high-energy screw press can be widely used in the forging pressureforming process.

The invention relates to an energy-efficient threshing and pneumatic separating process and device. The energy-efficient threshing and pneumatic separating process is characterized in that a two-bin pneumatic separator is adopted for a first stage pneumatic separating unit; three-bin pneumatic separators are adopted for a second stage pneumatic separating unit, a third stage pneumatic separating unit and a fourth stage pneumatic separating unit; and the strips yield of the first stage pneumatic separating unit, the second stage pneumatic separating unit, the third stage pneumatic separating unit and the fourth stage pneumatic separating unit is respectively 45-64%, 15-30%, 10-15% and 5-15%. The strips yield is decreased gradually so that the device dimensions and capacities of the second stage pneumatic separating unit, the third stage pneumatic separating unit and the fourth stage pneumatic separating unit are decreased gradually, and the physical dimension of the fourth stage pneumatic separating unit is 1 / 2 that of the first stage pneumatic separating unit. The purpose of separating qualified tobacco flakes and tobacco stalks is achieved through the technological process, adjustment of the pressure balancing surface position in separation bins of the two-bin pneumatic separator and each three-bin pneumatic separator of the first to fourth stage pneumatic separating units and speed adjustment of a conveying mesh belt.