50results about How to "Improve machine efficiency" patented technology

The invention relates to the technical field of machining, in particular to a parallel double-spindle double-station intelligent turning center which comprises a bottom plate, vertical plates extending upwards are fixedly connected to the left side and the right side of the bottom plate, first supporting seats are fixedly connected to the upper side of the bottom plate in a bilateral symmetry mode, and second supporting seats extending upwards are fixedly connected to the rear portion of the upper side of the bottom plate. The machining mechanism and the feeding and discharging mechanism are used in cooperation, the machining efficiency of workpieces can be effectively improved in a double-spindle and double-station synchronous machining mode, meanwhile, by means of an oblique feeding mode, the machining efficiency of the workpieces can be effectively improved, and the machining efficiency of the workpieces can be effectively improved. According to the tool turret assembly, the machining influence of cooling liquid and chippings on workpieces is effectively reduced, the follow-up cleaning time is saved, the tool can be rapidly assembled and disassembled, the assembling and disassembling efficiency of the tool turret assembly is effectively improved, installation is stable, and time and labor are saved in use.

The invention relates to a switching control circuit and a switching power supply. The switching control circuit comprises a switching module and a control module. The switch module is connected with the first output assembly, the first output port, the second output assembly and the second output port. The control module is connected with the switch module and used for controlling the switch module to conduct connection between the first output assembly and the second output port so that the first output signal can be transmitted through the second output port. Visibly, according to the application, different power output signals of different groups of AC-DC circuits in the same power supply design can be switched and output at different output ports through the switch module and the control module, so that the output of any group of AC-DC conversion circuits can be switched to the output of the output port of any other AC-DC conversion circuit; a DC-DC conversion circuit / module does not need to be arranged, any group transfer of output voltage, current and power of multiple groups of AC-DC conversion circuits is realized, and the overall efficiency of multi-path output of the switching power supply is improved.

The present disclosure relates to a vehicle, an on-board charger and a control method thereof, which belongs to the field of vehicles and can reduce the demand for busbar capacitor capacity, improve the efficiency of the whole machine and reduce costs. A control method for an on-board charger comprises: when detecting grid access, obtaining a preset battery allowable minimum voltage of the power battery and a current battery voltage of the power battery; if the current battery voltage is lower than the preset battery allowable minimum voltage, increasing the voltage of the busbar capacitor by reducing the resonant gain of the isolated DC / DC circuit until it is detected that the voltage of the power battery reaches the preset battery allowable minimum voltage.

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.

The invention relates to the technical field of magnetic suspension equipment, and provides a rotor structure and an assembly tool. The rotor structure comprises a core shaft and magnetic steel sleeved on the core shaft, the surface of the core shaft is recessed to form mounting grooves, the mounting grooves extend along the circumferential direction, the magnetic steel is arranged in the mounting grooves, titanium rings are arranged at two ends of the magnetic steel along the axial direction, one titanium ring is abutted between one side of the magnetic steel and the groove wall of the mounting groove on the corresponding side, and the other titanium ring is abutted between the other side of the magnetic steel and the groove wall of the mounting groove on the corresponding side. One titanium ring abuts against the magnetic steel, the other titanium ring abuts against the position between the other side of the magnetic steel and the groove wall of the mounting groove in the corresponding side, at least one of the two titanium rings forms a wedge-shaped titanium ring, and the width of the section of the wedge-shaped titanium ring is gradually reduced in the direction pointing to the axis of the mandrel along the circumferential face of the mandrel. According to the rotor structure provided by the invention, the pressing force in the axial direction can be generated between the wedge-shaped titanium ring and the groove wall of the mounting groove, so that the flexural rigidity of the rotor structure can be enhanced, the critical rotation speed of the rotor structure is improved, and the rotor structure has relatively good operation stability.

The utility model relates to the technical field of jigs, in particular to a jig beneficial to improving the first pass yield of a TFOG full-automatic retest AOI, a product carrier plate and a needle mold carrier plate are connected to a test platform plate, the needle mold carrier plate is located on the side of the product carrier plate, a plurality of strip-shaped fixing holes are formed in the needle mold carrier plate, the strip-shaped fixing holes are fixedly connected to the test platform plate through screws, and the needle mold carrier plate is fixed to the test platform plate through screws. A through opening is formed in the middle of the product carrying plate, a supporting flange is arranged on the periphery of the inner side of the through opening and used for supporting a product, a protruding shading plate is integrally formed on the supporting flange, and the position of the shading plate corresponds to the position of a camera hole in the product. Compared with the prior art, the jig beneficial to improving the AOI first pass yield of the TFOG full-automatic retest has the advantages that machine adjustment is convenient, and the machine changing efficiency and the jig universality are improved; and misjudgment caused by irradiation of light of the backlight source through the camera hole during detection can be effectively prevented, and the first pass yield of a product test is improved.

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.

The present invention relates to a novel power adapter and a working method thereof, comprising a rectifier filter circuit, a flyback circuit, a compensation circuit and a control circuit, wherein the rectifier filter circuit is connected to the flyback circuit, and the flyback circuit and the compensation circuit are both electrically connected to the control circuit; the flyback circuit is connected to the compensation circuit; the compensation circuit comprises a secondary compensation winding W2, a first diode D1, and a compensation capacitor C a and a DC-DC circuit; one end of the secondary compensation winding W2 is connected to the anode of the first diode D1, and the other end of the secondary compensation winding W2 is connected to the compensation capacitor C a The cathode of the first diode D1 is connected to the compensation capacitor C a The other end is connected to the DC-DC circuit; the DC-DC circuit is connected to the flyback circuit and the control circuit respectively. The semiconductor device in the compensation circuit of the present invention starts to work only when the input voltage is too low to meet the output power, which effectively reduces the switching loss and is conducive to improving the efficiency of the whole machine.

The invention discloses an intelligent driving container truck passing control method, and relates to the technical field of wharf scheduling control, and the method comprises the steps: obtaining a customs message, generating a passing delegation, and generating a first state mark for a container to be passed; associating the passing entrustment with the target intelligent container truck, and when the target intelligent container truck receives a ship unloading instruction, judging whether to execute passing according to a passing rule; if machine passing is executed, machine passing scanning of the target intelligent container truck is controlled to be started; the target intelligent container truck scans the channel through the quick inspection equipment, and feeds back a machine passing result to the wharf operation system; and if the container passing is successful, the target intelligent container truck is scheduled to a target position according to the ship unloading storage yard plan for container conveying. By calculating the wharf operation task and the instruction state of the intelligent container truck in real time, the dispatching system dispatches the intelligent container truck to operate according to the machine passing control rule, and the machine passing efficiency and the utilization rate of the intelligent container truck are improved.

The present invention discloses an impeller assembly of a guided sewage pump, which has a cutting function and adopts a closed and open combined structure as a whole, has the advantages of being leak-proof and highly efficient. The key points of the technical solution are that the impeller comprises an upper cover plate, a lower cover plate and a plurality of main blades connected between the upper cover plate and the lower cover plate, a shaft sleeve is arranged at the center of the upper cover plate, an impeller mouth ring is arranged at the center of the lower cover plate, the main blade comprises an inner end and an outer end, and a cutting knife is arranged at the inner end of the main blade. The present invention is applicable to the technical field of sewage pumps.

The utility model discloses an adjusting type cutting device which comprises a base device box, a conveying frame structure is fixedly installed on the surface of the base device box, a turning operation frame is fixedly installed on the surface of the base device box, and a lifting cutting device is fixedly installed on the surface of the turning operation frame. According to the adjusting type cutting device, non-woven fabric is conveyed by arranging the base device box and the conveying frame structure, the conveying horizontal line of the non-woven fabric is pressed downwards to be attached to the containing table top of the fixing frame through the conveying roller and the rotating rod, conveying stability is improved, sliding is prevented, and cutting accuracy is guaranteed; according to the non-woven fabric cutting machine, the machine efficiency is improved by arranging the turning operation frame and the lifting cutting device, cutting is conducted in groups, meanwhile, thick non-woven fabric can be cut through downward-pressing type cutting of the lifting cutting device, use is convenient, and the downward-pressing force and distance can be controlled through system operation.

The present invention relates to a multi-section TRT stator blade inner casing, comprising a first-stage air intake section, a first-stage expansion section, a second-stage air intake section and a second-stage expansion section which are coaxially arranged and connected in sequence, a first arc section which can match with the spherical surface of the first-stage stator blade is arranged on the circumference of the first-stage air intake section, and a second arc section which can match with the spherical surface of the second-stage stator blade is arranged on the circumference of the second-stage air intake section. The stator blade inner casing of the present invention adopts a multi-section structural design, so that each stage of the TRT stator blade has an expansion angle that matches it; by setting the first arc section of the first-stage air intake section to match with the spherical surface of the first-stage stator blade, and the second arc section of the second-stage air intake section to match with the spherical surface of the second-stage stator blade, on the one hand, the problem of excessive radial clearance between the TRT stator blade body and the inner casing is solved, and the efficiency of the whole machine is improved; on the other hand, the chamfering of the stator blade mounting hole is facilitated, and the processing efficiency is effectively improved.

The utility model discloses a quick location frock, relates to machining technical field, including fixing mechanism, also include adjusting mechanism and clamping mechanism, adjusting mechanism includes the rotating shaft, the outer side of rotating shaft top is sleeved with connecting plate, the top of connecting plate is equipped with the fixed plate, clamping mechanism includes mounting plate, the mounting plate is equipped with the fixed plate, and the mounting plate is equipped with the fixed plate. A horizontal clamping plate is arranged on the outer wall of one end of the mounting plate, an adjusting lead screw is arranged on the inner wall of the top of the mounting plate, a movable seat sleeves the outer side of the adjusting lead screw, an electric push rod is mounted on the outer wall of one end of the movable seat, and a vertical clamping plate is mounted at the output end of the electric push rod. The corresponding relation between the fixing hole and the adjusting hole can be adjusted through rotation of the adjusting lead screw and work of the electric push rod, so that the clamping mechanism can conveniently and accurately clamp and position machined parts of different sizes; and meanwhile, the servo motor works, so that the connecting plate can drive the clamping mechanism to adjust in the horizontal direction.

The utility model discloses an auxiliary splicing device for a multi-angle folding beam. The auxiliary splicing device comprises a sliding base, a vertical force transmission platform, a jacking mechanism, a balance beam, a fine adjustment mechanism and an anti-overturning mechanism. The sliding base is arranged on the ground below the splicing end of the two adjacent steel beams, the lower ends of the pair of vertical force transmission platforms are arranged on the sliding base in a sliding mode, and the pair of balance beams are arranged on the pair of vertical force transmission platforms in a lifting mode through jacking mechanisms; each balance beam is provided with a pair of anti-overturning mechanisms and a plurality of fine adjustment mechanisms, and every two adjacent steel beams are adjustably placed on the fine adjustment mechanisms at the tops of the corresponding pair of balance beams respectively, so that the splicing ends of the steel beams are located between the corresponding pair of anti-overturning mechanisms. The utility model relates to the technical field of steel structure construction, and can solve the problem that a special jig frame needs to be customized or a common jig frame needs to be matched with a truck crane for splicing during splicing of a multi-fold-line type steel beam in the prior art.

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 utility model belongs to the technical field of machining, concretely relates to a engine direct drive axle sleeve hole annular groove chambering forming device, including main body platform, the top of main body platform is provided with workpiece main body, the top of main body platform is provided with steady clamping subassembly, the top of main body platform is provided with chambering device, the chambering device is including the upper board frame, the bottom fixed connection of upper board frame is on the top of main body platform, the top of upper board frame is provided with drive assembly, the mobile end fixed connection of drive assembly has the extension column, the bottom fixed connection of extension column has chambering roller, the outer wall of chambering roller is fixedly connected with the convex ring. Drive assembly includes drive motor. The utility model solves the problem that the conventional chambering forming hole cannot generate annular groove, leads to workpiece material utilization rate is low, leads to the long problem of subsequent machining time, thereby improves the raw material utilization rate of workpiece.

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 invention relates to a control method and system of a resonant converter and computer equipment, the method comprises three control modes of a primary and secondary side outer phase shift control mode, a frequency conversion control mode and a secondary side inner phase shift control mode, and the method comprises the following steps: detecting an output voltage signal or an output current signal, and calculating to obtain a feedback control quantity VFB; when the feedback control quantity VFB is in a first interval, a primary side and secondary side outer phase shift control mode is adopted, when the feedback control quantity VFB is in a second interval, a frequency conversion control mode is adopted, and when the feedback control quantity VFB is in a third interval, a secondary side inner phase shift control mode is adopted; the hybrid control method is simple, the gain adjustment capability of the resonant converter is improved, the frequency adjustment range is effectively narrowed, and the efficiency and the power density of the resonant converter can be improved.

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 invention relates to the technical field of machine tool accessories and clamps, in particular to a four-claw floating self-centering chuck which comprises an upper shell, a moving block, a lower shell and a rotary button. The device is characterized in that the moving block and the upper shell are in sliding connection through a sliding groove, the moving block and the first driving assembly are in sliding connection through an inclined sliding groove, the first driving assembly and the second driving assembly are connected through a bolt, and the second driving assembly and the rotary button are connected through a screw. The second driving assembly is connected with the lower shell through a large bearing, the rotary button is in direct contact with the lower shell, the upper shell is connected with the lower shell in a welded mode, and the assembling threads are used for fixing the chuck. According to the self-centering clamping device, self-centering of a workpiece in two directions can be achieved, so that clamping of irregular objects is achieved, and clamping force is uniform, stable and not prone to loosening.

Provided is a bar feeder that pushes a rod-shaped workpiece into a hollow main shaft having a holding mechanism at one end of the main shaft, from another end, the bar feeder being arranged in a work room arranged adjacent to a processing room where the main shaft is installed, the work room being provided with a work machine including a transport mechanism for moving an article to and from the processing room, and the bar feeder being arranged at a position at which at least a portion thereof overlaps with the work mechanism in a top view or a front view.

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 present invention provides a cylinder and a compressor, wherein the cylinder comprises a cylinder body, wherein the cylinder body is provided with a cylinder cavity along the axial direction, and has a plurality of mounting holes along the circumferential direction, wherein the cavity wall of the cylinder cavity is arranged on a first circle, and the cylinder wall arranged outside the cylinder cavity wall is at least partially arranged on a second circle, wherein the first circle and the second circle are arranged eccentrically, and a convex portion is formed outside the cylinder wall, wherein the convex portion has a blade groove connected to the cylinder cavity, and a blade is arranged in the blade groove, and the blade divides the cylinder cavity into an intake cavity and a compression cavity, and the thickness of the cylinder body wall on the side where the intake cavity is located is greater than the thickness of the cylinder body wall on the side where the compression cavity is located. The present invention increases the thickness of the cylinder body on the side where the intake cavity is located to increase the thermal resistance of the intake cavity and reduce the heat transfer from the high temperature zone in the compressor housing to the intake cavity; and reduces the thickness of the cylinder body on the side where the compression cavity is located to reduce the thermal resistance of the compression cavity and increase the heat dissipation of the compression cavity, and at the same time, the inner diameter of the intake cavity can be reduced and the deformation of the blade groove on the side of the intake cavity can be prevented, thereby reducing mechanical losses and improving the efficiency of the compressor.

The present application discloses a variable pressure expander, a compressed air energy storage expansion system and a control method, wherein the variable pressure expander comprises: an inner casing, which comprises an inlet and an outlet, and the inner wall of the inner casing is provided with a plurality of stationary blades evenly distributed along its axial direction; a rotating shaft, which is rotatably arranged on the inner axis of the inner casing, and the outer wall of the rotating shaft is provided with a plurality of moving blades evenly distributed along its axial direction, and the plurality of stationary blades and the plurality of moving blades are staggered, and the adjacent stationary blades and the moving blades form a group of blade stages, and the adjacent blade stages are provided with blade stage gaps. The variable pressure expander of the present application is provided with a plurality of bypass pipes to eliminate the adverse effects of changes in volume flow caused by large fluctuations in intake pressure; when the intake pressure drops, the bypass is performed step by step, which not only ensures that the flow of gas between the blades can meet the requirements, but also ensures that the stages not bypassed always run in the high-efficiency zone, thereby improving the efficiency of the whole machine.

The present invention designs a single-stage PFC converter post-stage ripple elimination circuit, which is composed of a single-stage PFC converter (1), a DC-DC converter (2), a filter capacitor and an output capacitor. The single-stage PFC converter (1) has three groups or two groups of outputs. When the single-stage PFC converter (1) has three groups of outputs, the voltage difference between the first group and the second group of outputs is used as the input of the DC-DC converter (2), and the output of the DC-DC converter (2) is superimposed on the third group of outputs. Control is performed so that the AC component of the output of the DC-DC converter (2) just offsets the second harmonic of the third group of outputs, thereby obtaining a ripple-free DC output. When the power of the whole machine is relatively small, the single-stage PFC converter (1) can remove the third group of outputs, while the operating voltage of the DC-DC converter (2) remains unchanged, and its output is a ripple-free DC. Advantages: The operating voltage and conversion power of the DC-DC converter (2) are significantly reduced, and low-voltage power devices can be used to improve efficiency and reduce costs. The present invention is a new technical solution for single-stage PFC+DC conversion, which can be widely used in high power factor switching power supplies.

The present invention belongs to the technical field of molding sand recovery, and discloses a molding sand recovery device for flange casting, including a processing frame, a crushing roller is rotatably installed inside the processing frame, a feeding part is fixedly connected to the top of the processing frame, and a primary screening component is arranged inside the processing frame. The present invention uses the assembly state of the secondary screening component and the primary screening component through the rotation of the multi-stage vibration part, cooperates with the elastic connection effect of the elastic connection component, and makes the secondary screening component intermittently actively impact the primary screening component, thereby quickly and effectively realizing the synchronous auxiliary vibration of multi-stage screening, and the vibration of multiple groups of screening does not need to add multiple groups of vibration generating power, which reduces the investment in power equipment and comprehensively improves the screening effect of molding sand. The final screening effect is improved from the two aspects of enhancing the screening strength and multi-stage vibration, which greatly improves the effect and quality of the final molding sand classification recovery, and the use effect is good.

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 utility model discloses a high -efficient centrifugal ventilator of boiler exhaust gas suitable for inflow distortion, including air inlet tank, air inlet tank one side is provided with anti distortion current collector, and anti distortion current collector one end communicates with air inlet tank, and anti distortion current collector other end is not into volute, and anti distortion current collector is not into volute one end outside and is provided with airfoil impeller. High -efficient centrifugal ventilator of boiler exhaust gas suitable for inflow distortion, through optimizing the airflow import flow state, effectively reduced the internal flow loss of centrifugal ventilator, thereby significantly improved the whole machine operating efficiency, especially in the design working condition vicinity efficiency promotion is more outstanding, provides an effective way for realizing the design of high -efficient energy -conserving centrifugal ventilator.

This invention discloses a milling device for a swing arm assembly, comprising a clamping assembly, a clamping device, a sleeve positioning seat, an arc-shaped positioning block assembly, and a rectangular or irregularly shaped positioning block assembly, all mounted on a positioning base. The clamping device and clamping assembly are located at opposite ends of the positioning base, with the longitudinal centerline of the clamping device and the transverse centerline of the clamping assembly aligned on the same straight line. A sleeve positioning seat is located on one side of the clamping device. The arc-shaped positioning block assembly is located within the clamping assembly, and the rectangular or irregularly shaped positioning block assembly is positioned between the clamping device and the clamping assembly, parallel and adjacent to the arc-shaped positioning block assembly. This invention solves the problem of cumbersome positioning and alignment during the machining of key parts of the swing arm assembly, improving the machining efficiency, quality, and accuracy of the swing arm assembly. Furthermore, the interchangeability and mobility of the arc-shaped positioning block, the rectangular positioning block assembly, the irregularly shaped positioning block assembly, and the clamping device give the device a certain degree of versatility.