89results about How to "Realize opening" patented technology

The invention provides a controller for a non-complementary active clamp flyback converter. The controller comprises a frequency control unit, a pulse width control unit, a sequential control unit anda driving unit, uses a multi-mode control mode, and further comprises a wave peak detecting unit and a mode a determining unit. The wave peak detecting unit detects the peaks of an oscillating voltage at the drain end of a main switching tube, and turns on a clamp tube at the troughs in the non-complementary mode of the converter. The turning off of the clamp tube is determined by internally setturn-on time. The mode determining unit, according to feedback voltage FB, gives a mode switching signal to the sequential control unit according to a mode determining result signal. By using a DCM mode, the controller prevents the clamp tube from being turned on, reduces the peak-to-peak value of the excitation current when entering a frequency hopping mode, avoids audio noise, and optimizes no-load power consumption. Since the comparison process of the mode conversion is provided with a long time delay, the influence of mode switching on a converter control loop is reduced.

A high-efficiency intelligent high-side electronic load switch with wide voltage adaptability comprises a power supply module, a core control module, a self-boosting module, a voltage detection module, a current detection module and a switching module. The core control module is used for signal acquisition, information processing and storage and logic control; firstly, the core control module receives an external switch control input signal and detection signals output by the current detection module and the voltage detection module and processes and analyzes monitoring data according to an internally stored program to control the switching module to complete corresponding actions; secondly, the core control module provides a PWM control signal for the self-boosting module. The voltage detection module and the current detection module are used for detecting the real-time operating voltage and current of the switching module and transmitting data to the core control module for processing and analysis. The self-boosting module is used for providing a driving voltage for a switching tube in the switching module. The switching module is used for executing the on-off actions of a load. The high-efficiency intelligent high-side electronic load switch is wide in operating voltage range, high in operating frequency, high in efficiency, low in loss, safe, reliable and programmable.

The invention relates to a control method for a switching mechanism. According to the control method, a power source, a motor, a closing switch, an opening switch and a micro switch constitute a closed circuit. The control method mainly includes the following steps that the motor is powered on to drive a reduction gear set which is meshed with the motor to rotate; the reduction gear set drives a first gear which is meshed with the reduction gear set to rotate, and a cam mounted on the reduction gear set is made to rotate; an arc-shaped shifting block on the cam shifts a rotating member of the switching mechanism to rotate or revolving member to rotate; the rotating member drives a handle on the switching mechanism to rotate or the revolving member touches the switching mechanism to be disengaged after the revolving member rotates; a lever on the micro switch can rotate around a point of the micro switch, a contact a, a contact b and a contact c of the micro switch are changed, and thus the switching mechanism can be closed or opened automatically. The control mode is quite economical and simple and is beneficial to lowering the cost and promoting the market expansion of products.

The invention belongs to the technical field of building steel structure, in particular relates to a limb type circular tube node transferring structure and a manufacturing method thereof. The limb type circular tube node transferring structure comprises a trunk circular tube, a fork transitional node which is connected to one end of the trunk circular tube, a limb supporting rod circular tube and a space bracket which is installed on the external surface of the integral node; the fork transitional node is formed by two sections of special cone tubes through a central pull rod and a transverse insertion plate by penetrating; two half tiles at the bottom of the fork transitional node are combined to be an integral circle which is connected with the trunk circular tube; the end portion of the fork transitional node is connected with the two fork supporting rod circular tubes. The limb type circular tube node transferring structure has the advantages of solving the design problem of the circular tube fork connecting node, being simple and reasonable in structural design, attractive in appearance design and the like.

The invention discloses a switching state control circuit and control method and a fly-back converter. A first voltage sampling signal characterizing the input voltage information is obtained, and theconduction time of a synchronous rectifier tube is adjusted according to the change state of the first voltage sampling signal so as to adjust the absolute value of a negative current flowing througha secondary winding, wherein the negative current is used to discharge a junction capacitor of a main power tube so as to reduce the drain-source voltage of the main power tube. The main power tube can be switched on in a ZVS (Zero Voltage Switching) mode under different input voltages. The magnitude of the negative current is appropriate, and no extra circulating current will be generated. Adaptive control is realized.

The invention relates to a PC-class automatic changeover switch device with an energy storage mechanism. The device comprises a base, a contact system which is arranged on the base, the energy storage mechanism which is in transmission connection with the contact system and a drive motor which is in transmission connection with the energy storage mechanism, wherein the drive motor is fixed on the base through a motor support; the energy storage mechanism comprises an energy storage support unit, an energy storage gear, an energy storage handle, an energy storage spring assembly and an energy storage cam, wherein the energy storage support unit is fixedly connected to the motor support; the energy storage gear is arranged in the energy storage support unit and is in transmission connection with the drive motor; the energy storage handle which is arranged above the energy storage gear and the bottom of the energy storage handle which is engaged with the energy storage gear; the energy storage spring assembly cooperates with the energy storage gear; and the energy storage cam is coaxial to the energy storage gear, is arranged at the outer side of the energy storage support unit and is in transmission connection with the contact system. Compared with the prior art, the device has simple and compact overall structure and convenient processing and manufacturing, and the energy storage mechanism is provided, so that when the automatic changeover switch rotates, the phenomenon of clamping stagnation or failed linkage cannot occur, and the device is safe and reliable.

The invention provides a circuit breaker. The circuit breaker comprises a shell, a contact system, a transmission system, a tripping system, a driving motor and an operating handle, wherein the transmission system comprises a driving piece, a transmission piece, a rotating piece and a linkage piece; an elastic piece is arranged between the transmission piece and the shell; the stripping system comprises a stripping shaft; and a trigger part for pressing the tripping shaft is arranged on the transmission piece or the rotating piece. When a user is in arrearage, the driving motor drives the transmission piece to overcome the elastic force of the elastic piece to rotate to a set angle, the stripping shaft is pressed, and the contact system is switched off; after the user pays the fee, the driving motor continues to rotate, the stripping shaft is not pressed any longer, the transmission piece is detachably matched with the driving piece, the transmission piece turns round under the elastic force effect of the elastic piece, and the linkage piece is driven through the rotating piece, so that the contact system is switched on. Therefore, before the user continues to pay the electric charge, the user cannot get the electricity automatically due to the fact that the stripping system is at a trigger state and the operating handle can automatically reset to a switch-off position even if the operating handle is artificially pulled to be switched on.

The invention relates to an Ethernet switching system based on the CATV cable transmission network. The technical problem solved by the invention is to provide an Ethernet switching system which has the advantages of the lowest access cost, the simplest engineering reform and stable performance. The technical proposal includes that the Ethernet switching system based on the CATV cable transmission network comprises a local end device and a terminal device, and is characterized in that the local end is composed of a local end power supply, an RJ45 network interface, a link state indication part, an Ethernet switching control part, a physical layer interface circuit, a network transformer, a low pass filter, a high pass filter, a coaxial cable terminal, a CATV signal distributor, a local system configuration part and a local control port; the terminal device comprises a passive client and an active client. The Ethernet switching system based on the CATV cable transmission network is applicable to the last a hundred meters centralized distribution access part in the bidirectional reform of the broadcast television network and realizes the starting of the user broadband service or the video on demand (VOD) television interaction service.

The invention discloses a switch converter and a control method thereof. The switch converter comprises a positive input power source, a positive output voltage source, a power source common ground, switch tubes Q1 to Q4, an inductor L1 and a capacitor C1, the drain of the switch tube Q1 and the drain of the switch tube Q3 are connected to the positive input power source, the source of the switchtube Q1 and the drain of the switch tube Q2 are connected to one end of the inductor L1, the source of the switch tube Q3 and the drain of the switch tube Q4 are connected to the other end of the inductor L1, the source of the switch tube Q4 is connected to one end of the capacitor C1, and the source of the switch tube Q2 and the other end of the capacitor C1 are connected to the power source common ground. The inductor L1 can be rapidly demagnetized under a relatively high ratio of input voltage to output voltage, current waveform of the inductor L1 is converted from triangular into quadrangular, and high-efficiency high-frequency work of the switch converter is realized.

The invention relates to an upright cap buckle type cable distribution box with an electronic tag. The cable distribution box includes a cap buckle type upper cover, a seal ring, an end cover, a locking mechanism, an inside-box fiber fusion, light splitting and fiber distribution component, an electronic tag and a fixing structure. The cap buckle type upper cover includes a box body, a mounting base and a mounting mouth. The seal ring is inlaid around the mounting base. The end cover and the inside-box fiber fusion, light splitting and fiber distribution component are connected to constitute aplugging component. The plugging component is plugged into the box body of the cap buckle type upper cover through an opening and makes the end cover and the seal ring tightly abut against each other. The locking mechanism locks and fixes the end cover and the mounting base. The electronic tag is set on a long side of the mounting mouth. The fixing structure is used for fixing the cable distribution box to an outside fixed body. By adopting a cap buckle type upright upper box body structure, the damage to electrical elements caused by subjective and objective factors can be avoided. The electronic tag makes management convenient.

The invention discloses a multifunctional bar forming mold structure of a fin mold. The multifunctional bar forming mold structure comprises an upper mold plate, a lower mold plate, a convex mold fixing plate arranged on the bottom face of the upper mold plate, and a concave mold fixing plate arranged on the end face of the lower mold plate. The multifunctional bar forming mold structure is characterized in that a set of bar forming sub mold is arranged between the convex mold fixing plate and the concave mold fixing plate, the two sides of the bar forming sub mold are respectively provided with at least one set of movable edge cutting sub mold which are arranged between the convex mold fixing plate and the concave mold fixing plate, the two adjacent edge cutting sub molds are arranged at intervals, and each edge cutting sub mold and the bar forming sub mold are arranged at intervals. A stripper plate is arranged between the bar forming sub mold and each edge cutting sub mold, blanking openings corresponding to the bar forming sub mold and the edge cutting sub molds are formed in the concave mold fixing plate, and a guiding mechanism is arranged between the convex mold fixing plate and the concave mold fixing plate. The multifunctional bar forming mold structure of the fin mold can achieve bar forming and edge cutting functions, the edge cutting sub molds can be moved according to needs to meet the requirements of different sheet types of materials, and universality is better.

The invention discloses a high-voltage interface protection device of an electrical control cabinet. The device comprises a cabinet body, a partition plate is fixed in cabinet body, an insulating spacer sleeve is inserted into the partition plate; a cover plate is arranged outside the partition plate on one side of the insulating spacer sleeve; a transverse fixed supporting shaft and a transversemovable supporting shaft or a transverse movable supporting shaft and a transverse fixed supporting shaft are respectively inserted and fixed at the upper end and the lower end of the cover plate; arc-shaped guide grooves are formed in the inner walls of the two sides of the cabinet body. The two ends of the movable supporting shaft are inserted into the guide grooves; limiting pieces of the movable supporting shaft are arranged at the two ends of the guide groove. The limiting piece comprises a placement groove formed in the inner wall of the guide groove, an insertion pipe formed in the inner wall of the placement groove, a telescopic rod inserted into the insertion pipe, a ball formed at one end of the telescopic rod and a pressure spring inserted into the telescopic rod and the insertion pipe in a sleeving manner; a baffle is formed on the telescopic rod on one side of the ball, arc-shaped grooves are formed in the two ends of the movable supporting shaft, and one end of the ball is embedded in the corresponding groove. The cover plate can be opened and closed conveniently, and positioning can be achieved when the cover plate is opened and closed.

The invention relates to a box turning device, which comprises a bracket; a turret mounted on the bracket driven and rotated by a motor; two sets of box clamping devices symmetrically rotated and installed on both sides of the bottom of the turret; one end is hinged to the top of the turret The box cover fixing device; and one end is installed in the middle part of the turret, the other end is installed in the box cover fixing device and drives the first telescopic cylinder of the box cover fixing device. The invention can realize the automatic turning and opening of the box body, and has the advantages of low energy consumption, low cost, and stable operation process; the invention has a compact structure, can realize turning over the box in a small space, and has flexible layout.

The invention relates to a double-acting piston pneumatic pump, comprising a cylinder assembly, a hydraulic cylinder assembly and a steering device. The cylinder assembly comprises a cylinder, a top cover, a bottom cover, a double-acting piston and a ventilation component; the steering device comprises a steering valve casing, a plunger rod, a plunger, a steering valve seat, a ventilation plate and a square plunger cover; a plunger cover vent hole on the square plunger cover is connected to a side wall vent hole on a copper bush of a steering valve rod to form an airflow path (i); a spool chamber vent hole on the steering valve casing is connected to a bottom vent hole of the copper bush of the steering valve rod to form an airflow path (j); and the steering of the airflow path which pushes the double-acting piston to move upwards and downwards is achieved by controlling the switching between a communicated state and an isolated state of the airflow path (i) and the airflow path (j) so that the conversion from a pressure energy to a hydraulic energy is achieved. The double-acting piston pneumatic pump has the advantages of simple structure, high volume efficiency and fine environment adaptability.

The invention belongs to the technical field of power switch devices, and particularly relates to a grounding switch transmission mechanism which comprises a substrate, a transmission device and a locking device. The transmission device is arranged on the substrate and in transmission connection with a grounding output rotating shaft and drives the grounding output rotating shaft to rotate forwards and backwards under the action of an energy storage spring, so that a grounding switch is opened and closed, and forward and backward rotation of a separation rotating shaft drives the energy storage spring. When the grounding switch is in an opening state, opening of the grounding switch is locked by locking the transmission device. When the grounding switch is in a closing state, closing of the grounding switch is locked by locking the transmission device. The grounding switch transmission mechanism is simple in structure, and opening and closing positions of the switch can be locked.

The invention discloses a multimedia display device for artistic design, which comprises a placement box, wherein an audio playing device is arranged on the side of the placement box, a display screenis fixedly connected to the front side of the placement box, a hydraulic telescopic rod is fixedly connected with the bottom of the inner wall of the placement box, a support plate is fixedly connected to the top of the output shaft on the hydraulic telescopic rod, packaging sleeves are stacked on the upper surface of the support plate, paper works are fixedly connected to the inside of the packaging sleeves, side plates are fixedly connected to the front and rear sides, near the top, of the placement box, and connection plates are fixedly connected to opposite sides of the two side plates. Through the cooperative use of the structures, the problems that inconveniences in both the display and collection process are caused, manual operation is time-consuming and labor-consuming, thus teaching staff is difficult to concentrate on teaching, and teaching quality is reduced as paper works are generally fixed on traditional display racks in advance during actual use are solved.

The invention discloses a circuit breaker of an integrated electric operating mechanism. The circuit breaker comprises a shell, fixed contacts are fixedly connected in the shell, moving contacts movably connected with the fixed contacts are rotatably connected to the shell, and a remote switch on and switch off mechanism for controlling contacting or separation of the fixed contacts and the movingcontacts is arranged in the shell. After a user is owed, the fixed contacts can be separated from the moving contacts through the remote switch on and switch off mechanism to achieve the power outagepurpose, and meanwhile the fixed contacts can make contact with the moving contacts through the remote switch on and switch off mechanism.

The invention provides a combined electric appliance three-position mechanism comprising a frame; the frame is provided with a grounding switch operating device, a closing switch operating device, a three-position output device and a trip gear; the three-position output device comprises an output shaft sleeve and a first connecting lever connected in a rigid manner; the output shaft sleeve and theframe rotatably match; a differential plate is arranged on one side of the first connecting lever, and provided with a first slide groove; a first drive pin is arranged on the other side of the firstconnecting lever, and rotatably connected with a first connecting rod; when a spring energy storage device rotates to the maximum energy storage position, the storage energy is released so as to enable a main switch operating device to continuously rotate; the main switch operating device drives the three-position output device to rotate via the first connecting rod and the first drive pin, thusoutputting a torque. The mechanism can realize closing-opening-grounding three-position switching operations via two input positions and one output position, is compact in structure, and easy to use.

The invention discloses a switching converter and a control method thereof. The switching converter comprises a positive input power supply, a negative output voltage, a power supply common ground, aswitch transistor Q1, a switch transistor Q2, a switch transistor Q3, a switch transistor Q4, an inductor L1 and a capacitor C1, wherein the drain electrode of the switch transistor Q1 and the drain electrode of the switch transistor Q3 are connected to the positive input power supply, the source electrode of the switch transistor Q1 and the drain electrode of the switch transistor Q2 are connected to one end of the inductor L1, the source electrode of the switch transistor Q3 and the drain electrode of the switch transistor Q4 are connected to the other end of the inductor L1, the source electrode of the switch transistor Q4 is connected to one end of the capacitor C1, and the source electrode of the switch transistor Q2 and other end of the capacitor C1 are connected to the power supplycommon ground. According to the invention, the input voltage and the output voltage are opposite in polarity, all switch transistors ZVSs are turned on, and the efficiency is high; fast demagnetization of the inductor L1 can be realized when the absolute value of the ratio of the input and output voltage is great, the current waveform of the inductor L1 is changed from triangular into quadrilateral, and the high-frequency efficient operation of the switching converter is realized.

The invention discloses a dismantling method for a building component. The dismantling method comprises the following steps that building component dismantling equipment runs in place, and hole forming work of static cutting drill bits and water spray work of raise dust prevention water spray devices are carried out; the static cutting drill bits are taken back, telescopic fixed pins stretch out,a mechanical arm is adjusted, so that a fixed device moves till the telescopic fixed pins are matched with holes, and the telescopic fixed pins are inserted into the holes and are fixed firmly; and cutting work of the building component is carried out, and after the building component and a body structure are completely separated, the building component is moved way through the building componentdismantling equipment. By means of the dismantling method, through the building component dismantling equipment, the functions of hole forming, fixing and transporting of the building component are achieved; compared with multi-type combined work, the integration degree is high, construction cost is reduced, and construction efficiency is improved; and meanwhile, through the arrangement of the raise dust prevention water spray devices, dust can be effectively prevented from flying off, and the green and healthy work environment is achieved.

The invention provides a ring main unit three-location isolation operation mechanism. The operation mechanism comprises a front panel, a rear panel, an output shaft module, an energy storage spring module, an isolation operation shaft module, a grounding operation shaft module and an operation hole baffle plate; a holding cavity is arranged between the front panel and the rear panel in parallel; the output shaft module, the isolation operation shaft module and the grounding operation shaft module penetrates through the holding cavity; the isolation operation shaft module an the grounding operation shaft module are arranged at two sides of the output shaft module; the isolation operation shaft module and the grounding operation shaft module are in transmission connection through the outputshaft module; the energy storage spring module is connected between the isolation operation shaft module and the grounding operation shaft module; and the operation hole baffle plate is arranged at the top of the output shaft module. The isolation, the ground switch-on and switch-off processes are accomplished through the spring energy storing release effect, and the performance of the isolationswitch is more stable and reliable.

The invention relates to a mechanical switch switching-off action mechanism, belongs to the technical field of direct current transmission. The mechanical switch switching-off action mechanism comprises an upper busbar and a lower busbar, wherein one side of the upper busbar is connected with an upper static contact; a lower static contact is connected to a position, on the same side as the upperbusbar, of the lower busbar; the upper static contact and the lower static contact are matched with an upper moving contact and a lower moving contact located on a connecting rod respectively; a connecting rod head is arranged at the lower end of the connecting rod; the connecting rod head is arranged on a crank in a sleeved mode; and the crank is connected with a motor. According to the mechanism, a crank connecting rod structure is used for driving the moving contacts to act, so that the use reliability of the whole mechanism can be ensured while rapid switching-off and switching-on is realized.

The invention discloses a precise drilling fixing device for an arc-shaped surface of a hardware product, which comprises a base, a first through groove is formed in the top surface of the base, a vertical plate is fixedly and vertically mounted on the top surface of the base, and a top plate is fixedly and vertically mounted on the top surface of the vertical plate. A shell is installed on the top face of the base and connected to the right side face of the vertical plate. A motor is installed at the left end of the top face of the base, the shaft end of the motor is in key connection with the left end of a rotating shaft, the rotating shaft movably penetrates through the vertical plate and the left side wall of the shell, and meanwhile the right end of the rotating shaft is in bearing connection with the inner wall of the right side of the shell. According to the precise drilling fixing device for the arc-shaped surface of the hardware product, it can be conveniently guaranteed that drilling is conducted after the hardware product is stably clamped and fixed, meanwhile, the distance between adjacent holes is conveniently adjusted, operation is easy, convenient and flexible, and practicability is high.

The invention discloses a single-stage zero-current switch full-bridge boost DC converter and a control method thereof, a primary side of the converter is composed of a boost inductor, a full-bridge module, a group of reverse series switch tubes and an LC series resonant cavity, a secondary side of the converter is a voltage doubling rectifying circuit, and the primary side and the secondary side are connected through a high-frequency transformer. Two reverse series switch tube drives have the same duty ratio equal to 0.5, the phase difference is half a switching period, two switch tube drives of a leading bridge arm have the same duty ratio larger than 0.5, the phase difference is half a switching period, and the duty ratio and the phase difference of two switch tubes of a lagging bridge arm are the same as those of the leading bridge arm. The reverse series switch tube group and the same-direction switch tube of the leading bridge arm have the same opening starting point; and a phase shift angle is formed between the switch tube drives on the diagonal lines of the two bridge arms. The transmission power and the step-up ratio can be adjusted by controlling the phase shift angle, and zero-current switching of all semiconductor devices in a wide load range is realized through frequency conversion control.

The invention discloses an oppositely-opened folding carbon fiber cabin cover of a large cabin body. The oppositely-opened folding carbon fiber cabin cover is characterized in that the oppositely-opened folding carbon fiber cabin cover is integrally molded by adopting a carbon fiber composite material and comprises a left cabin cover, a right cabin cover, hinge assemblies, cabin cover locking mechanisms, folding mechanisms and cover opening and closing mechanisms; the left cabin over and the right cabin cover each comprise an upper cabin cover and a lower cabin cover, the lower cabin covers are connected with the cabin body through the multiple groups of hinge assemblies, and the cover opening and closing mechanisms are arranged between the lower cabin covers and the cabin body and controlled to achieve cabin cover opening and closing; the upper cabin covers and the lower cabin covers are connected in a hinged mode and connected to the folding mechanisms correspondingly, and the folding mechanisms are controlled to achieve left cabin cover and right cabin cover folding; and the cabin cover locking mechanisms are arranged at the butt joints of the upper cabin covers of the left cabin cover and the right cabin cover. The cabin cover has the characteristics of oppositely-opened folding, radar concealment, bullet preventing and destruction resisting, electromagnetic shielding, small self weight, large load capacity, good thermal insulation properties, long life and the like.