340results about How to "Reduce the amplitude" patented technology

The invention discloses equipment and a method for detecting the strength of an annular section of a large-diameter TA31 pipe, and relates to the technical field of pipes. According to the annular section strength detection equipment for the large-diameter TA31 pipe, through the design of a composite mechanism, the pipe is placed in the processing mechanism, the pipe space is restrained through the limiting mechanism, the pipe is prevented from moving in the inspection process, danger to workers is avoided, and therefore normal operation of the equipment is kept; the fixing mechanism controls the pipe to rotate and rub with the processing mechanism, so that the effect of cleaning the surface of the pipe is achieved, the situation that stains on the surface of the pipe affect the detection effect is avoided, a hydraulic rod controls a pressing plate to extrude the surface of the pipe, and the detection effect on the annular section strength of the pipe is achieved; therefore, the friction force on the surface of the pipe is increased, the pipe is prevented from shaking in the downward pressing process, and the operation stability is improved.

The invention discloses a burr removing device for badminton racket processing, and relates to the technical field of burr removing devices, and the burr removing device comprises a composite mechanism. According to the burr removing device for badminton racket processing, through the design of a composite mechanism, a racket is placed on the fixing mechanism, the outer side of the racket is clamped through the fixing mechanism, so that the effect of fixing an object is achieved, burr removing operation is facilitated, a racket rod is placed in the stabilizing mechanism, and the stabilizing mechanism fixes the racket rod; the polishing mechanism is controlled to ascend and descend through the electric push rod so that the racket can be attached conveniently, the edge removing quality can be improved, the motor drives the center rotating shaft to rotate so as to drive the polishing mechanism to rotate, and therefore the effect of polishing the inner ring of the racket is achieved. And the metal chippings fall into the collecting box from the central groove, so that the effect of collecting the chippings is achieved, impurities are convenient to clean, and the deburring effect is prevented from being influenced.

The invention discloses a production welding tool for stainless steel pipe fittings, and relates to the technical field of pipe fitting welding, and the production welding tool comprises a composite mechanism. According to the production welding tool for the stainless steel pipe fittings, through the design of a composite mechanism, the pipe fittings at one end are vertically placed on the top of the bearing mechanism, the effect of fixing the pipe fittings is achieved through the bearing mechanism, then the pipe fittings at the other end are vertically placed in the butt joint mechanism, and the effect of stabilizing components is achieved through the butt joint mechanism; the lifting butt-joint mechanism is in butt-joint fit with the bearing mechanism, so that the anti-deviation effect is achieved, manual calibration errors are avoided, the welding effect is prevented from being influenced, the operation efficiency is improved, the welding mechanism is attached to the joint of the two pipe fittings, the bearing mechanism is driven to rotate through a rotating block, the constant-speed welding effect is achieved, the welding quality is improved, and the size of a welding seam is reduced. And the welding precision is improved, chippings can occur in the welding process, the protection ring plays a role in shielding and wrapping, and chippings are prevented from splashing.

The invention discloses a virtual impedance adjustment-based current-limiting control method and system for a network construction converter, and the method comprises the steps: determining a fault transient virtual resistance according to the voltage difference between the terminal voltage of a virtual synchronous machine and the voltage of a grid-connected point in a fault transient state when the system breaks down; in a fault steady state, determining a fault steady state virtual resistance and a fault steady state virtual inductance according to a voltage difference between a terminal voltage of the virtual synchronous machine and a grid-connected point voltage and a current over-limit threshold value of the networking converter; the large value of the fault transient virtual resistance and the fault steady-state virtual resistance is used as the fault virtual resistance, and the fault steady-state virtual inductance is used as the fault virtual inductance; and determining a fault potential difference by using the line current, the fault virtual resistance and the fault virtual inductance, and obtaining a fault current instruction value through a voltage control outer ring according to the difference values of the voltage instruction, the output voltage of the network construction converter and the fault potential difference. The current does not exceed the limit in the fault steady state, and the current impact caused by the superposition of the non-periodic component current and the periodic component current does not exceed the limit in the fault transient state.

The invention discloses a Gyandroid type three-period minimal curved surface primary surface heat exchanger based on a compression method, belongs to the technical field of heat exchangers, aims to solve the problem of optimizing a typical Gyandroid type TPMS (Tire Pressure Monitor System) to improve the heat exchange performance of the heat exchanger, and is technically characterized in that a compressed Gyandroid type three-period minimal curved surface core body is arranged in an accommodating space; a Gyandroid type three-period minimum curved surface core body is compressed and formed in any coordinate axis direction, a low-temperature working medium channel opening and a high-temperature working medium channel opening are formed in the surface of the compressed Gyandroid type three-period minimum curved surface core body, a low-temperature working medium channel and a high-temperature working medium channel are formed in the compressed Gyandroid type three-period minimum curved surface core body, and the Gyandroid type three-period minimum curved surface core body can be used for oil product cooling in the petrochemical industry. The heat exchanger has the advantages that the spanwise pressure drop is reduced, the heat exchange amount is increased, and the heat exchange effect of the heat exchanger is obviously improved through optimization.

The invention discloses bending equipment for solar photovoltaic support machining, and relates to the technical field of bending, and the bending equipment comprises a composite mechanism. According to the bending equipment for solar photovoltaic support machining, through the design of the composite mechanism, a support is placed on the conveying mechanism, the support is conveyed to the bottom of a composite frame body through the conveying mechanism, and then a hydraulic rod controls a pressing block to press the support, so that the fixing effect is achieved, and a certain shaping effect is achieved when the support is fixed; the lateral bending mechanism plays a certain anti-adhesion role in the bending process, adhesion and influence on the operation efficiency in the extrusion process are avoided, the lateral bending mechanism is matched with the pressing block, the lateral bending mechanism extrudes the two sides of the support so as to achieve the bending effect, the support is conveyed through the conveying mechanism, and the conveying efficiency is improved. Therefore, the support is convenient to replace, manual operation steps are reduced, and operation efficiency is improved.

The utility model relates to the technical field of walnut processing, and discloses a walnut ultrasonic shell breaking and kernel taking device which comprises a rack, and a walnut conveying mechanism, a walnut shell breaking mechanism and a material collecting mechanism which are arranged on the rack, the walnut conveying mechanism is used for driving the falling walnuts to move and conveying the walnuts to the walnut shell breaking mechanism; the walnut shell breaking mechanism drives walnuts to move and extrudes and breaks shells of the walnuts through ultrasonic high-frequency vibration; and the material collecting mechanism is used for screening and collecting the walnut kernels and the walnut shells after shell breaking. Through the walnut conveying mechanism, the walnut shell breaking mechanism and the material collecting mechanism, the process of walnut conveying, extrusion shell breaking and recovery is achieved, ultrasonic waves are applied to the field of walnut shell breaking, Yunnan walnuts are hard in shell and small in shell-kernel gap, the characteristics that high-frequency vibration under the mechanical effect of the ultrasonic waves is suitable for breaking of hard and brittle materials are utilized, walnut shell breaking is assisted, and the walnut shell breaking efficiency is improved. The shell breaking rate and the whole kernel rate are improved.

The invention relates to the technical field of metal cutting, in particular to a rapid cutting device for hardware fittings. The device comprises a working platform arranged on the top of a base; the top of the working platform is fixedly connected with a pair of symmetrically-arranged translation mechanisms, a fixing mechanism is arranged between the two translation mechanisms, and the sides, close to the fixing mechanism, of the translation mechanisms are fixedly connected with lifting mechanisms. According to the rapid cutting device for the hardware fittings, the arranged fixing platform is used for placing the hardware fittings to be cut, the translation mechanism drives the cutting mechanism to translate to the position above the hardware fittings, the lifting mechanism drives the cutting mechanism to move up and down so that the cutting mechanism can cut the hardware fittings, and the stabilizing mechanism synchronously moves up and down along with the cutting mechanism; the vibration amplitude of the cutting mechanism during working is reduced; and in the process that the cutting mechanism cuts the hardware fittings, the stabilizing mechanism can block splashing metal chippings and guide the chippings to fall to the top of the working platform.

The invention discloses rock core drilling sampling equipment for geological disaster investigation, and relates to the technical field of sampling, and the rock core drilling sampling equipment comprises a composite mechanism. According to the rock core drilling and sampling equipment for geological disaster investigation, through the design of a composite mechanism, the motor is connected with the butt joint block, and the drill rod is inserted into the inner side of the butt joint block, so that drilling and sampling are conducted on rocks, in the drilling process, the movable frame slides on the outer side of the sliding column so as to ascend and descend, and therefore the work requirement is met; a drill bit mechanism is arranged on the outer side of the drill rod, large rocks are crushed through the drill bit mechanism in the drilling process, meanwhile, rock blocks are guided to enter the inner side of the drill rod, so that a sample is taken out when the movable frame body is lifted subsequently, subsequent treatment is facilitated, and after sampling is finished, the drill bit mechanism is used for crushing the large rocks and guiding the rock blocks to enter the drill rod. When the sample is taken out from the inner side of the drill rod, the sample is taken out more cumbersomely and difficultly, the pushing and pressing mechanism is pressed by the electric push rod, so that the effect of discharging the sample is achieved, and normal operation of equipment is kept.

The invention provides a swing type tuned mass damper which comprises a mass unit, a swing arm unit and an energy consumption unit, the mass unit comprises an upper mass block and a lower mass block, the upper mass block is in swing connection with a controlled structure through the swing arm unit, and the lower mass block is in swing connection with the controlled structure through the energy consumption unit. The lower mass block can be horizontally and movably supported on the controlled structure through a horizontal guide assembly; the energy dissipation unit comprises a linear damping assembly and a nonlinear damping assembly, the linear damping assembly is arranged at the bottom of the lower mass block, the nonlinear damping assembly comprises linear dampers symmetrically arranged on the two sides of the mass unit, and the upper mass block and the lower mass block are connected through the linear dampers. The vibration damper has the advantages that the occupied space is reduced under the condition of the same mass unit vibration frequency and effective mass, and the vibration damping effect is good.

The invention relates to the technical field of air rail transportation, in particular to a power type bogie based on a box girder type base and an induction gap adjusting method. The power type bogie comprises a box girder type base, the box girder type base comprises a suspension gap located at the bottom and communicated with an inner cavity, first rails located on the two sides of the suspension gap are arranged at the bottom of the box girder type base, and an induction magnetic stator is fixedly arranged on the inner side of the top of the box girder type base. The bogie assembly comprises a bottom frame, a motor support arranged on the bottom frame and walking wheels arranged on the bottom frame; the top of the motor support is provided with a motor rotor having an induction gap with the induction magnetic stator, and the motor rotor is used for driving the bogie assembly to move under the action of magnetic force generated by the motor rotor and the induction magnetic stator. And the gap adjusting device is used for adjusting the size of the induction gap. A semi-closed base can be formed through the box girder type base, a bogie and other components are arranged in a box girder cavity, maintenance is convenient, the influence of weather is small, and the service life can be prolonged.

The invention relates to the technical field of bridge accessory structures, and provides a power generation device using bridge vibration and a bridge, the power generation device comprises a first piezoelectric part and a second piezoelectric part, the first piezoelectric part and the second piezoelectric part are both located in a cavity of a bridge body, and the first piezoelectric part and the second piezoelectric part are arranged in the cavity. One side of the first piezoelectric component is connected with one side of the second piezoelectric component, the other side of the first piezoelectric component is connected to the side wall through a first elastic component, and the other side of the second piezoelectric component is connected to the side wall through a second elastic component. The deformation directions of the first elastic component and the second elastic component are parallel to each other, the second piezoelectric component is compressed when the first piezoelectric component is stretched, and the second piezoelectric component is stretched when the first piezoelectric component is compressed. The device can generate power through vibration generated by the bridge, the power generation efficiency can be improved, and the continuity and stability of power generation are guaranteed.

The invention discloses a porous static pressure gas radial bearing based on piezoelectric shunt damping, and belongs to the technical field of static pressure gas bearings. Comprising a bearing shell, a bearing sleeve and a porous throttler which are arranged in the bearing shell in the axial direction, and a piezoelectric shunt damping module which is arranged between the bearing shell and the bearing sleeve and is axially fixed through a check ring. Wherein the piezoelectric shunt damping module is formed by connecting a force amplifier, a piezoelectric ceramic stack, a pre-tightening pressing block, a pre-tightening screw, a steel ball and a locking nut; the force amplifier is of an axisymmetric structure composed of two trapezoidal connectors, four thin-wall beams and two end plates. The piezoelectric shunt damping module is arranged in the bearing, vibration mechanical energy of the bearing sleeve is converted into electric energy through the piezoelectric ceramic stack, and net damping is provided for the bearing by consuming the electric energy generated by the piezoelectric ceramic stack through the external shunt resonance circuit, so that the amplitude of the rotor relative to the bearing at a high rotating speed is reduced; the high-speed stability of the bearing is improved.

The utility model provides a seat electric sliding rail lifting assembly which comprises a bottom plate, a movable plate is arranged above the bottom plate, and a lifting assembly is arranged between the bottom plate and the movable plate. A motor is started to drive a screw rod to rotate, then the screw rod drives moving blocks on the two sides to move synchronously through a movable plate, then the two moving blocks can drive two gears to turn over oppositely through teeth, then the two connecting rods on the lower side are driven to turn over, the connecting rods are unfolded, and then a fixing base on the upper side is pushed to move upwards; height adjustment of the seat is achieved, height adjustment is not sensitive enough, the seat moves stably in the lifting process, vibration impulsive force can be buffered through the buffer springs, the influence of vibration on passengers is reduced, the buffer springs are in a compressed state, the amplitude of the buffer plate can be gradually reduced when the buffer plate is vibrated, and the damping and buffering effects are achieved.

The invention provides a bionic fluctuating propeller combining magnetorheological damping and elastic elements. The bionic fluctuating propeller comprises a driving part and a driving part, the transmission part comprises a shell, a containing space is formed in the shell, the shell is connected with the driving part, and the driving part drives the transmission part to reciprocate through the shell; the rotating shaft is rotatably arranged at the bottom of the accommodating space and extends out of the top of the shell; the damping assembly is arranged in the containing space and arranged on the rotating shaft in a sleeving mode, the damping assembly is filled with magnetorheological fluid, and the rotating damping of the rotating shaft is adjusted by adjusting the viscosity of the magnetorheological fluid; the elastic component is connected with the shell; and the swinging part is connected with the elastic assembly and the rotating shaft, and the swinging part swings relative to the driving part under the action of the damping assembly and the elastic assembly.

The invention relates to the technical field of voltage transformers, and particularly discloses an intelligent voltage transformer which comprises a transformer shell, an intelligent control system is fixedly mounted at the top in the transformer shell, a clamping mechanism is fixedly mounted at the lower end of one side of the transformer shell, and the buffer performance of the device is enhanced by adopting a buffer mechanism; in the application period of the device, when the mutual inductor shell vibrates, the buffer springs are matched with the dampers for buffering and seismic resistance, the whole device has the high buffering performance, the dampers are arranged between the bottom support and the mounting plate, the amplitude of the buffer springs can be reduced, and the buffering and seismic resistance can be improved; when the bottom support shakes, the side buffer springs are pulled to stretch and contract for buffering, the overall buffering performance is further improved through the combined action of the side buffer springs and the buffer springs, through the design, the influence of vibration on a mutual inductor shell is effectively reduced, and stable operation of the device is guaranteed.

The invention relates to a multifunctional multi-axis linkage numerical control internal and external circle and thread grinding machine which comprises a base, a grinding head and a grinding head. The N grinding spindles are symmetrically arranged on the machining table; the cross-shaped moving assembly is arranged on the base and located above the grinding main shaft; the lifting assembly is arranged on the cross-shaped moving assembly; the machining base is arranged on the cross-shaped moving assembly in a sliding mode and connected with the lifting assembly; the N machining spindles are symmetrically arranged on the machining base and correspond to the grinding spindles one to one. According to the multifunctional multi-shaft linkage numerical control internal and external circle and thread grinding machine, the grinding main shaft and the machining main shaft are symmetrically arranged to reduce vibration, and then the machining precision is improved. The N main shafts are symmetrically and uniformly distributed and can be vertically, horizontally and obliquely arranged. The overall rigidity is improved by 4 times, the amplitude is reduced by 4 times, the precision is improved by 16 times, and the machining rhythm speed is improved by 4 times. Different grinding wheel tools can be replaced so as to be widely applied to grinding machining of inner holes, outer circles and threads. The whole weight is light, the occupied area is small, and energy consumption is low.

The fresh air conditioner with the noise reduction function comprises an air conditioner outdoor unit body, a heat dissipation cavity and a refrigeration assembly are arranged in the air conditioner outdoor unit body, a sound absorption layer is fixedly connected to the interior of the heat dissipation cavity, and a plurality of sound absorption holes are evenly formed in the inner side wall of the sound absorption layer; the lower side wall of the air conditioner outdoor unit body is fixedly connected with a plurality of matching sleeves, the upper inner wall of each matching sleeve is fixedly connected with a damper, the output end of each damper is fixedly connected with a supporting leg, and the outer side wall of each supporting leg is fixedly connected with a matching protrusion. A reset spring is fixedly connected to the position, located in the matching sleeve, of the lower side wall of the matching protrusion. The vibration amplitude of the device can be effectively reduced through the reset spring, the damper can absorb vibration energy, the vibration reduction effect of the device can be effectively improved through combination of the reset spring and the damper, and then noise can be prevented from being transmitted to the outside.

The present invention discloses a reinforcement installation device for a radar antenna, including a connection panel and a radar device. The radar device includes a substrate and a radar body. The radar body is fixedly connected to the substrate below, a pressure plate is fixedly connected to the substrate below, a buffer assembly is arranged below the substrate, a support is arranged between the pressure plate and the connection panel, and the radar device is fixedly connected to the connection panel through the pressure plate, bolts and anti-loosening nuts. In the present invention, a support and a pressure plate are arranged between the radar device body and the connection panel, so that when the radar device is installed by bolts, the connection stability and connection effect between the two are improved, so that the connection and fixation between the two are more secure. At the same time, the arc shape of the first support part and the second support part greatly reduces the amplitude of the vibration generated by the connection panel transmitted to the radar device through the bolts, reduces the vibration impact force of the indirect radar device from the vehicle body, and makes the connection more secure.

The invention discloses an RRAM control method and system, a control end and an RRAM, and the RRAM control method comprises the steps: inputting a first control signal and a second control signal to a read-write control end of a storage unit, so as to enable the storage unit to execute a write-in operation according to the first control signal; the first control signal comprises a plurality of write control pulses, the second control signal comprises metastable state elimination pulses corresponding to the write control pulses respectively, and the pulse direction of the metastable state elimination pulses is opposite to that of the corresponding write control pulses. And the read-write control pulse is generated between the corresponding write control pulse and the first read-write control pulse after the write control pulse. In the application, the metastable state elimination pulse can counteract or eliminate the metastable state after the write control pulse is removed, so that the metastable state is prevented from interfering processes such as read verification executed by a subsequent storage unit, and the data retention of the storage unit can be improved, thereby improving the reliability of the storage unit during the subsequent execution of the processes such as read verification.

The embodiment of the utility model discloses a universal wheel assembly and cleaning equipment with the universal wheel assembly. The universal wheel assembly comprises a universal wheel support and a universal wheel, the universal wheel is accommodated in the universal wheel support and can rotate around a universal wheel shaft; wherein the upper surface of the universal wheel support is provided with a cavity covering part, and the cavity covering part is used for sealing a cavity in the upper surface of the universal wheel support. According to the universal wheel assembly, the amplitude of the shell can be reduced when the universal wheel assembly collides with other objects, the amplification effect of the cavity on sound generated by collision is reduced, the collision sound is reduced, and the noise reduction effect is achieved.

The present invention belongs to the technical field of lightning prevention and control, and discloses a lightning arrester and a lightning protection device using the positioning pin. By arranging a collector wheel around the upper needle rod and arranging an adjustable capacitor below, the lightning arrester eliminates corona, can form a sufficiently long upward leader discharge, actively search for lightning and eliminate it, expand the protection range of the lightning arrester, reduce the damage of lightning strikes to buildings and electrical equipment, and is particularly suitable for application in summer lightning protection scenarios of various high-rise buildings.

The invention provides a damping device for a steel hollow floor slab and the steel hollow floor slab, and relates to the technical field of floor slab damping, the damping device comprises a prestressed inhaul cable, a stiffening beam, a connecting short beam and a first friction damper; the stiffening beam is arranged at the bottom of the floor slab and used for supporting the floor slab and transmitting vertical vibration of the floor slab; the two ends of the stiffening beam are connected with the two connecting short beams correspondingly, and the stiffening beam is connected with the main beams on the two sides through the connecting short beams. One end of the connecting short beam is connected with the main beam, and the other end is connected with the end part of the stiffening beam; the upper surface of the connecting short beam is connected with the lower surface of the floor; the two first friction dampers are connected between the two ends of the stiffening beam and the two connecting short beams correspondingly and used for dissipating floor vibration energy. The two ends of the prestress inhaul cable are connected to the main beams on the two sides respectively and used for vibration reduction of the floor slab. The prestressed inhaul cables and the stiffening beams are arranged in parallel, and the prestressed inhaul cables are arranged on the two sides of the stiffening beams. Resonance of the floor slab under the action of pedestrian load is reduced, and living comfort and safety are improved.

The utility model relates to the technical field of heat exchangers, and particularly discloses a tube bundle supporting structure of a tube type heat exchanger, which comprises two supporting plates, and U-shaped frames are fixedly mounted on the outer walls of the tops of the two supporting plates; the multiple buffering and damping mechanisms are distributed at equal intervals and fixedly installed on the inner wall of the bottom of the U-shaped frame, supporting blocks are fixed to the outer walls of the tops of the buffering and damping mechanisms, and the surfaces of the supporting blocks are in an arc shape; after the tube bundle is impacted, kinetic energy brought by impact is converted into elastic potential energy for compression of the buffer spring, then damping force formed by the damping liquid counteracts the elastic potential energy, the elastic potential energy is converted into heat energy to be dissipated, the amplitude of the buffer spring is rapidly attenuated, and the buffer rod rapidly tends to be stable in the buffer cylinder. Therefore, the stability of the tube bundle is ensured, the tube bundle is prevented from being damaged, and the normal use of the tube bundle is ensured.

The invention discloses an unmanned aerial vehicle anti-swing mechanical claw, and relates to the technical field of unmanned aerial vehicle grabbing, and the unmanned aerial vehicle anti-swing mechanical claw comprises a composite mechanism. According to the anti-swing mechanical claw for the unmanned aerial vehicle, through the design of a composite mechanism, a motor controls a rope in an electric hoist to stretch out and draw back, the length of the rope is conveniently adjusted, the application range is expanded, the electric hoist collects the rope to drive a grabbing mechanism to ascend, and a connecting block is in butt joint with a processing mechanism, so that the effect of fixing components is achieved; the anti-swing device has the advantages that shaking in the flying process is reduced, the stability of the device is improved, so that the anti-swing effect is achieved, the stability of material transportation is improved, the conveying efficiency is improved, materials are clamped through the grabbing mechanism in an electric shrinkage grabbing mode, the material fixing effect is achieved, and the friction force on the rope is increased through the friction mechanism; therefore, the effect of constant-speed lifting is achieved, the stability of equipment is further improved, meanwhile, mechanical faults are avoided, and parts are prevented from derailing.

The present invention discloses a low common-mode voltage modulation strategy for a three-level three-phase four-bridge-arm inverter, and belongs to the field of photovoltaic power generation. The modulation strategy comprises the following steps: sampling a three-phase modulation wave and a superimposed zero-sequence component; respectively giving the carriers used by the first three bridge arms and the fourth bridge arm; generating a PWM wave to drive the inverter to work. Aiming at the problem that the common-mode voltage of the three-level three-phase four-bridge-arm inverter is relatively high, the existing modulation algorithm is complex, the amount of calculation is large, and it is not conducive to promotion to engineering applications, the present invention proposes a low common-mode voltage modulation strategy for a three-level three-phase four-bridge-arm inverter without adding or changing any hardware. The modulation strategy can reduce the common-mode voltage amplitude of the three-level three-phase four-bridge-arm inverter and the number of common-mode voltage level changes within one carrier cycle by only changing the carrier phase.

The invention discloses container shell welding equipment for chemical pressure container machining, and relates to the technical field of shell welding, and the container shell welding equipment comprises a composite mechanism. According to the container shell welding equipment for chemical pressure container machining, through the design of a composite mechanism, the telescopic rod is used for controlling the welding frame to conduct lifting operation, so that welding materials can be attached conveniently, the application range is expanded, and the operation efficiency is improved; and when the telescopic rod controls the welding frame to ascend and descend, the protection mechanism is attached to the top of the material, so that the effect of presetting a welding spot is achieved, deviation during welding is prevented, the welding quality is improved, and the welding efficiency is improved. Materials are welded in a mechanical rotating mode, and normal operation of material welding is guaranteed.

The utility model discloses a pulsator washing machine. The pulsator washing machine comprises a box body; the barrel body comprises an outer barrel arranged in the box body and an inner barrel arranged in the outer barrel, and a plurality of first fixing holes are formed in the top of the inner barrel in the circumferential direction at intervals; the balance ring assembly comprises a first balance ring and a second balance ring, a balance ring cavity is defined between the first balance ring and the second balance ring, and the balance ring cavity is filled with balance liquid; wherein the first balance ring is located on the side, away from the bottom of the inner barrel, of the second balance ring, a plurality of fixing columns are arranged on the first balance ring in the circumferential direction of the first balance ring at intervals, second fixing holes are formed in the fixing columns in the length direction of the fixing columns, and the second fixing holes correspond to the first fixing holes in a one-to-one mode. The first balance ring penetrates through the first fixing hole and the second fixing hole through a fixing piece and is fixedly connected with the inner cylinder. According to the pulsator washing machine, balance liquid can be distributed in the balance ring more smoothly, and the balance capacity of the balance ring is improved.

The utility model provides a centrifugal fan, including volute still include: impeller, the impeller is provided with at least two groups, and at least two groups impeller follow the axial direction of volute, the middle disc is arranged between two groups of adjacent impeller, two groups of adjacent impeller are separated through the middle disc, and the import of middle disc is linked together with the import of volute, each group impeller is provided with several blades, and several blades are arrayed around the axial direction of volute, and the blade of two groups of adjacent impeller is staggered along the projection direction of blade. Through the mode for increasing the number of blade, increase the times of cutting the airflow that enters the volute, thereby improved the frequency of rotation noise, namely BPF noise, make BPF noise frequency far away from the hearing range of human ear, and then reduce the situation that the user hears the rotation noise. In addition, the blade that interlaces can break the shedding vortex that the blade tail edge produces, reduces the broadband noise of fan.

The invention relates to the technical field of bearing assembly, and particularly discloses a rapid ball distributing device applied to bearing machining, the rapid ball distributing device comprises a mounting bottom plate and a mounting stand column, the upper end of the mounting stand column is slidably sleeved with a sliding sleeve, the sliding sleeve is fixedly sleeved with a movable plate, and the top of the mounting stand column is fixedly connected with a fixed top plate; a pressing and inserting air cylinder is installed at one end of the fixed top plate, a fixed shaft rod is installed at the end, away from the sliding sleeve, of the movable plate, an installation base is installed at the lower end of the fixed shaft rod, an installation sleeve is installed on the bottom face of the installation base, and a plurality of ball inserting needles are evenly arranged in the installation sleeve. According to the device, the automatic reset capacity after the movable plate is pressed down can be improved, it is ensured that after one-time pressing and inserting operation is completed, the ball inserting needle can be rapidly restored to the original position and rapidly put into the next-time pressing and inserting preparation operation, and therefore the ball distributing efficiency of the device on steel balls in a bearing is greatly improved, and the assembling speed of the bearing is increased.