12results about How to "Improve machine efficiency" patented technology

The application provides a kind of intelligent zero point positioning quick change system, mechanical manufacturing system and its working method, intelligent zero point positioning quick change system includes quick change support plate, transfer device, waiting device, quick change device and zero point positioning base plate, its characteristics are: it further includes positioning state air tightness detection module, clamping force detection module and remote diagnosis device, positioning state air tightness detection module judges whether zero point positioning state is qualified by pressure sensor;Clamping force detection module judges whether zero point positioning state is qualified by tension sensor;Alarm for unqualified zero point positioning state.The zero point positioning state automatic detection device is wirelessly communicated with the remote diagnosis device, for simultaneously real-time remote transmission of detection and recording results, and remote diagnosis, early warning and reasonable maintenance scheme reporting.The automation and intelligent level is high, and its zero point positioning state automatic detection device ensures the positioning reliability of zero point positioning device through detection and early warning, and realizes remote control.

This invention discloses a phase-shifted full-bridge plasma power supply based on all SiC devices, belonging to the field of special power supply technology. It includes: a rectifier unit with a power factor correction circuit; an inverter unit containing a phase-shifted full-bridge topology composed of SiC power devices and an energy storage inductor, achieving zero-voltage switching through phase-shift control; a transformer unit; an output unit including an output filter capacitor; and a control unit that uses an incremental PID algorithm to generate phase-shift control signals. This invention analyzes the differences in zero-voltage switching between the leading and lagging bridge arms, utilizes the low output capacitance characteristics and dynamic dead-time adjustment of SiC devices, broadens the soft-switching range under light loads, effectively reduces output current ripple, and improves dynamic response speed and overall efficiency.

The utility model relates to the technical field of fixed hydraulic clamps, and discloses a fixed hydraulic clamp for machining, which comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with a hydraulic rod, the output end of the hydraulic rod is fixedly provided with a support, and the inner wall of the support is rotatably connected with a connecting block. A bearing plate is fixedly connected to the upper surface of the connecting block, a rotating rod is rotatably connected to the outer wall of the bearing plate, a rotating shaft is rotatably connected to the inner wall of the rotating rod, a sliding block is fixedly connected to the outer wall of the rear side of the rotating shaft, a sleeve is slidably connected to the outer wall of the sliding block, and a clamping block is fixedly connected to the outer wall of the sliding block; and an overturning assembly is arranged on the upper surface of the bottom plate. The hydraulic rod is started to push the support to move to enable the connecting block to move, the connecting block drives the bearing plate to move upwards to enable the rotating rod to rotate, the rotating rod drives the rotating shaft to enable the sliding block to drive the clamping block to clamp a workpiece, and therefore the effects of rapidly clamping the workpiece and improving the machining efficiency can be achieved.

This invention primarily relates to the field of inrush current suppression technology. To suppress circuit damage caused by instantaneous inrush current during AC power outage recovery due to the capacitor voltage being significantly lower than the peak supply voltage, this invention provides a circuit and method for suppressing instantaneous power outage current inrushes. The core improvement is that a thermistor limits the inrush current during load startup, and after startup, the relay bypasses the thermistor to achieve low-loss operation. When the load is not running, the control chip comprehensively judges based on the amplitude and rate of change of the bus DC voltage: when the bus voltage is detected to be below a first threshold and the rate of decrease is too fast, it is determined to be an instantaneous power outage state, and the relay is actively disconnected and the thermistor is reconnected in series, thereby suppressing the inrush current that may be generated during voltage recovery; after the bus voltage stabilizes and rises back to a higher second threshold, the relay is controlled to smoothly engage, restoring the low-loss power supply mode.

The application discloses a kind of protection system and method of IGBT drive signal based on DSP and FPGA, belong to power electronics and power semiconductor control technical field.System includes signal acquisition unit, DSP master module, FPGA co-control module, IGBT drive circuit and IGBT power module;Signal acquisition unit acquires the operating state information of IGBT power module;DSP master module receives the control instruction and initial drive parameter of external system and carries out optimization to the parameter, handles fault signal and generates fault response instruction, sends control instruction, fault response instruction and optimized drive parameter to FPGA co-control module;FPGA co-control module generates PWM signal, generates fault signal and protection instruction according to the operating state information of IGBT power module when fault occurs;IGBT drive circuit receives PWM signal and protection instruction, generates IGBT drive signal;IGBT power module receives drive signal and responds, generates operating state information.The application can realize the real-time generation of IGBT drive signal, fault protection and dynamic optimization.

The utility model relates to the technical field of fan equipment, in particular to a high-efficiency negative-pressure butterfly-shaped door shaft circulation fan, which comprises a shell and is characterized in that an air inlet of the shell adopts a circular-arc-shaped horn mouth design, a square flange is arranged on the outer side of the circular-arc-shaped horn mouth, a diffusion cylinder is arranged at an air outlet of the shell, and a fan blade is arranged on the diffusion cylinder. An inclined butterfly door support frame is arranged in the diffusion cylinder; a butterfly-shaped door is further arranged in the diffusion cylinder and connected with a fixing frame through a hinge structure, and the fixing frame is installed on the supporting frame. According to the fan, the long diffusion barrel design is adopted at the air outlet, a part of dynamic pressure is effectively converted into static pressure, and the overall efficiency of the fan is improved; according to the fan, the arc-shaped horn mouth design is adopted at the air inlet, so that air inflow is streamlined, rotation and turbulence of airflow are reduced, the airflow is more stable, resistance is reduced, and the efficiency of the fan is improved; the square flange is additionally arranged at the air inlet, so that the hole is more convenient to block, and the sealing effect is better.

The utility model provides a kind of heat dissipation device of electric control board and range hood comprising it, heat dissipation device includes two interval cover metal cover, drain pipe and heat dissipation fan, electric control board is enclosed in second metal cover;The sidewall of first metal cover is equipped with heat dissipation air inlet, and the shell of main fan is equipped with heat dissipation air outlet;The air outlet of heat dissipation fan is communicated with heat dissipation air inlet;The inlet of drain pipe is communicated with heat dissipation air outlet, and the outlet of drain pipe extends to the import negative pressure area of main fan.The heat dissipation device of electric control board and range hood comprising it, while protecting electric control board from being contaminated, accelerate the airflow speed in heat dissipation air duct, so that heat is discharged faster, improve overall heat dissipation effect.By setting drain pipe, while dissipating heat, the negative pressure area of main fan air inlet can also be air-supplied, reduce eddy current noise, improve the overall efficiency of range hood.

The application relates to an oscillating pulse screw drill tool with improved shaft stress, which comprises a drill tool body, a static valve assembly and a dynamic valve assembly. The drill tool body comprises a shell and a shaft, the shell is a hollow tubular structure, and the shaft is located in the shell and can rotate in the shell. The static valve assembly comprises a static valve shell coaxially connected with the shell, and a static valve flow channel is arranged in the static valve shell. The dynamic valve assembly is axially gap-connected with the static valve assembly, and comprises a dynamic valve seat fixed on the top of the shaft, and a dynamic valve flow channel is arranged in the dynamic valve seat. The dynamic valve assembly rotates eccentrically relative to the static valve assembly to periodically change the flow area between the static valve flow channel and the dynamic valve flow channel. The dynamic valve assembly of the application is gap-connected with the static valve assembly, the static valve assembly directly transmits the axial force borne by the static valve assembly to the static valve shell, and does not directly transmit the axial force to the dynamic valve assembly. Therefore, the shaft can bear additional axial force, rotating friction resistance and bending moment, the service life of the shaft and the bearing system of the screw drill tool is prolonged, and the efficiency of the whole screw drill tool is improved.

The invention discloses a single-stage booster fan, a multi-stage booster fan and a multi-channel booster fan, and relates to the technical field of automobile ventilation equipment, and the single-stage booster fan, the multi-stage booster fan and the multi-channel booster fan comprise a fan shell which is of a closed shell-shaped structure as a whole, an air inlet is formed in one end of the fan shell, and an air outlet is formed in the other end of the fan shell; the rotor part is rotationally installed in the fan shell, the rotor part is provided with a plurality of first axial flow fan blades which are arranged in a radial shape, and all the first axial flow fan blades synchronously rotate along with the rotor part and surround the peripheral side of the rotating axis of the rotor part; the rotor part is matched with a driving mechanism for driving the rotor part to rotate; the stator part is fixedly installed in the fan shell and coaxially arranged on the air outlet side of the rotor part, the stator part is provided with a plurality of second axial flow fan blades arranged in a radial mode, the second axial flow fan blades surround the peripheral side of the axis of the stator part, and the spiral direction of the second axial flow fan blades is opposite to the rotating direction of the first axial flow fan blades; in a limited space, the pressurization ventilation effect in a vehicle is improved.

The application discloses a control method and an inverter welding machine system of a dual-voltage inverter welding machine. In the initial stage of power-on, an AC power grid voltage is collected, and a three-phase line voltage signal is extracted; the three-phase line voltage signal is sent to a main control unit for algorithm determination, so that the current input system is identified as three-phase 220V or three-phase 380V, and a target control parameter set including at least a bus voltage stabilizing threshold, a PWM drive duty cycle reference and current closed-loop curve parameters is automatically matched and generated; the aforementioned parameters are used as control instructions to drive a silicon carbide power device to perform high-frequency inversion to output initial welding direct current; output end voltage and current are sampled in real time, and corresponding theoretical reference values are extracted from the closed-loop curve, and a dynamic deviation is calculated by comparison, so that the PWM drive duty cycle is closed-loop regulated. The application realizes full-automatic identification and debugging-free of dual voltage, deeply links voltage identification with silicon carbide high-frequency drive and digital closed-loop compensation, and can greatly improve welding constant current control precision and stability.

The embodiment of the invention provides a control method of a dual-active-bridge micro inverter and related equipment, and belongs to the technical field of power electronic converter control. The method comprises the following steps: firstly, establishing a unilateral asymmetric duty ratio modulation model based on three variables of an external phase shift angle D1, an internal phase shift angle D2 and switching frequency, and deducing transmission power and soft switching constraint conditions; secondly, the switching frequency is dynamically adjusted according to the voltage phase of the power grid, and high frequency is adopted near voltage zero crossing to expand the soft switching range; thirdly, in a rated frequency interval of main power transmission, taking minimization of current stress as a target, adopting an improved self-adaptive particle swarm algorithm to carry out on-line optimization on D2 under the soft switching constraint, and calculating a corresponding D1; and finally, combining the optimized frequency with the phase shift angle feed-forward quantity and the feedback compensation quantity to generate a PWM driving signal. According to the invention, the large-range soft switching of a whole power frequency period is realized, the conduction loss is obviously reduced, and the system efficiency and reliability are improved.

The application discloses a short-circuit protection circuit and a switching power supply. The short-circuit protection circuit comprises a first resistor and a detection circuit. One end of the first resistor is used for connecting one end of an output capacitor, and the other end of the first resistor is used for connecting an output ground of the switching power supply. An input end of the detection circuit is connected with one end of the first resistor, and an output end of the detection circuit is used for connecting a short-circuit protection trigger end of a control circuit. The detection circuit is used for detecting a first voltage signal generated at two ends of the first resistor, and outputting a second voltage signal after processing the first voltage signal. The second voltage signal is used for being sent to the control circuit, and the power converter is controlled by the control circuit to stop working when the second voltage signal is less than a set value. The application can realize quick and lossless detection of short-circuit protection, and improve the short-circuit protection speed of the switching power supply and the whole machine efficiency.