32results about How to "Avoid strong vibration" patented technology

A safety brake for a load receiving means of a lift, in which at least one brake wedge (13) penetrates into a tapering gap between a resiliently supported pressure body (14) and a guide rail (1) of the load receiving means (2) and thereby generates a braki ng force, is equipped with a device (18) which limits the stroke of the brake wedge and thus the braking force in dependence on the retardation occurring at the load receivi ng means.

The invention discloses a method for eliminating air-suction vortex at the water inlet of a pumping station under the condition of beeline layout of a gate and a station, and belongs to the technical field of hydraulic engineering pumping stations. The method is characterized in that the aim of eliminating the air-suction vortex at the water inlet of the pumping station is fulfilled by controlling large-whirl flow in a pumping station fore bay caused by a cross flow rate with piers of a bridge for a trash-eliminating machine on the water inlet side of the pumping station; specific to the aim of eliminating the air-suction vortex at the water inlet of the pumping station, the bridge for the trash-eliminating machine is arranged at a position which is 4D0 away from an inlet cross section of an inflow runner of the pumping station, the number of holes is 2 times the number of pumping station units, and the central lines of the piers are aligned with central lines of separating piers at the water inlet of the pumping station in a plane direction; partition walls are arranged between a check gate and the pumping station; the position, length and width of the bridge for the trash-eliminating machine and the lengths of the partition walls can be adjusted in a certain range. By adopting the method, the air-suction vortex at the water inlet of the pumping station under the condition of beeline layout of the gate and station can be effectively eliminated; the method has important significance to safe and stable running of the pumping station.

The invention discloses a device and a method for preventing cavitation and vibration of an underground filling pipeline. The device is composed of a buffer tank, a collecting hopper and an accident pool. The method comprises the five steps of pressure relief chamber building, pressure relief device erecting, auxiliary facility installing, filling pipeline connecting and accident emergency treatment. According to the device and method, a special pressure relief device is arranged between a pumping pipeline and a self-flowing pipeline, the pumping pipeline which is closed in the whole process is converted into the pumping pipeline and the self-flowing pipeline which are open and relatively independent, and therefore the overall energy consumption of a pipeline conveying system is reduced, the phenomena of liquid flow cavitation, negative pressure, cavities and the like of the closed pipeline are avoided, cavitation and strong vibration of the filling pipeline are prevented, and the conveying safety and stability of the filling pipeline are guaranteed. The device and method have the advantages of being simple in structure, high in practicability, small in investment and capable of reducing energy consumption.

The invention discloses a multifunctional handheld drilling machine for construction. The multifunctional handheld drilling machine for construction structurally comprises a main hand shank, an auxiliary hand shank, a drilling machine perpendicularity auxiliary device, a drill bit, a snap ring, a machine body and a shoulder rest. One end of the machine body is connected with the shoulder rest, andthe other end of the machine body is provided with the drill bit. Compared with the prior art, the multifunctional handheld drilling machine for construction has the beneficial effects that the drilling machine can drill holes and collect drilling cuttings simultaneously, facilitate cleaning, effectively prevent the drilling cuttings from being splashed anywhere and from injuring an operator; thehand shanks adopt novel structures, the air can be circulated through the space to facilitate quick heat dissipation of the hands of the operator and the hand shanks, and heat of the hand shanks canbe prevented from being transferred to the drilling machine; hollow shank bodies can be cooled through cooling liquid, the hands are further prevented from getting hot and sweating, the hollow shank bodies can maintain cleanliness, antiskid outer shanks can keep dry to prevent bacterium breeding, and the service life of the drilling machine can be prolonged; and the multifunctional handheld drilling machine for construction is additionally provided with a noise reduction and shock attenuation device, has the shock attenuation and noise reduction functions, protects hearing of the operator against damage and prevents noise pollution.

The invention discloses a self-balancing type anti-vibration spin dryer tube comprises a base, wherein the upper end of the base is rotationally connected with a tube body, a plurality of balancing cavities are formed in the side wall of the tube body, a plurality of liquid storage cavities in communication with the balancing cavities are further formed in the side wall of the tube body, the liquid storage cavities are filled with balance weight liquid, an exhaust groove is formed in the side wall of the base, a sliding plug is connected into each liquid storage cavity in a sealed and slidingmode, a driving device for driving balance weight liquid to flow is installed in the exhaust groove, and exhaust pipes in communication with the liquid storage cavities are embedded in the inner wallof the tube body. By arranging the balancing cavities, the liquid storage cavities, the balance weight liquid and the driving device, when the certain side of the spin dryer tube is heavier after thespin dryer tube rotates, the balance weight liquid can be guided into the balance cavity on the opposite side to obtain balance of the overall mass of the spin dryer tube, so that strong vibration during high-speed rotation is avoided, the service life of the washing machine is prolonged, and meanwhile, clothes can be dewatered more thoroughly.

The invention discloses a projector convenient to calibrate a projection position and good in stability. The projector comprises a projector body, lifting mechanisms, a fixing mechanism and an air passage. A bottom plate is fixed with the lower surface of the projector body through bolts. A rotating rod is mounted below the middle position of the bottom plate. A supporting plate is arranged on theouter side of the rotating rod. A rotating mechanism is mounted below the rotating rod. The lifting mechanisms are installed at the four corners of the outer edge of the supporting plate correspondingly. A mounting box is connected below the lifting mechanisms. The fixing mechanism is connected with the lower portion of the mounting box. A lifting motor is mounted in the mounting box. A transverse plate is fixed on the outer surface of the inner side of the mounting box. An air pipe is mounted on the lower surface of the transverse plate. A micro air pump is fixed on the middle of the upper surface of the transverse plate, and a connecting pipe is mounted at the joint of the micro air pump and the air pipe. According to the invention, the accuracy of adjusting the calibration projection position of the projector is improved, and the projector is adsorbed on a desktop through negative pressure, thereby facilitating the improvement of the fixing stability of the projector.

The invention discloses a water hammer-resistance damping device of a pipeline. The damping device is connected to the tail end of the pipeline and comprises a connecting body, a horn-shaped channel which is through front and back is formed in the connecting body, the small end of the channel is an inlet end, the large end of the channel is an outlet end, the inlet end of the channel is in sealedbutt joint with the tail end of the pipeline, a buffer block is arranged at the position, close to the outlet end, in the channel, the inner end of the buffer block extends into the channel and makescontact with the inner side wall of the channel in a sealed mode, a buffer cavity is formed in the middle of the outer end of the buffer block, a through hole and a plurality of blind holes are formedin the bottom of the buffer cavity, the buffer cavity communicates with the channel of the connecting body through the through hole, and the outer end of the buffer block extends out of the outlet end of the channel and blocks the outer end of the buffer cavity through a blind plate. The device has the advantages that the water hammer phenomenon can be effectively prevented and relieved, and a pipeline system is protected.

The invention discloses a vibration and noise reduction device and an operation method thereof. The vibration and noise reduction device comprises a compressor body, a four-way valve, a fastening mechanism and a vibration isolation and noise reduction cylinder. The four-way valve is provided with an exhaust connector and an air return connector, and the exhaust connector and the air return connector are both connected with the compressor body through pipelines. The compressor body, the four-way valve and the fastening mechanism are all located in the vibration isolation and noise reduction cylinder. The fastening mechanism comprises an installation assembly used for installing the four-way valve and a fastening belt, the two ends of the fastening belt are connected with the installation assembly, and a size-adjustable sleeving part is formed between the fastening belt and the installation assembly. And the installation assembly is fixed on a shell of the compressor body through the fastening belt. The device can reduce the vibration amplitude of the four-way valve, is favorable for protecting the pipelines and avoiding fatigue fracture of the pipelines, and meanwhile can effectively reduce the operation noise of a refrigeration workpiece.

The invention relates to the technical field of grain ultrafine powder screening, and discloses a screening device for grain ultrafine powder processing, which comprises a base and a screening box, the base is connected with a hanging bracket positioned at the top through two vertical support frames, and a telescopic hose A for feeding is communicated between the top of the screening box and the hanging bracket; the screening box is movably arranged between the hanging bracket and the supporting frame, a penetrating fine powder filter screen is arranged at the bottom of the screening box, a powder guiding cover fixed to the bottom wall of the fine powder filter screen is connected to the lower portion of the fine powder filter screen in a covering mode, a discharging port of the powder guiding cover is communicated with a material collecting box fixed to the top of the base, and an exhaust fan with a filter screen at an air inlet is arranged on the right side wall of the material collecting box. A motor is fixed to the left supporting frame and pushes a connecting plate connected with the bottom of the screening and filtering box through two movable rods. The problems that when fine powder is accumulated, the density is large, rapid discharging is difficult, the screening difficulty is large, and large particles and impurities can block screen holes, and work is seriously affected are solved.

The invention discloses a stirring device for road and bridge construction, which comprises a stirring box, an elliptical inlet is arranged at the bottom of the stirring box, vulcanized rubber is arranged on the inner wall of the box, a stirring rod is arranged at the bottom of the box, and the stirring rod There is a semicircular stirring piece and a square stirring piece on the top, a retractable support is provided on one side of the mixing box, an opening is provided on the other side of the box, and the opening is connected with a rubber pipe, and the rubber pipe is provided on one side There is a cement box, the outer wall of the box is provided with a water injection port, one side of the cement box is provided with an opening, the opening is connected with the rubber pipe, the other side of the cement box is provided with an opening, and the inside of the cement box is provided with Cleaning device, the inner wall is provided with a water tank, the cement tank and the mixing box are fixed on the iron cart, the bottom of the iron cart is equipped with an engine, and the iron cart is surrounded by tires, the beneficial effect is that the noise is low and the cleaning is convenient , easy to transport, simple and convenient to use, has good economic and social benefits, and is suitable for popularization and use.

The invention relates to the technical field of cold rolling mills, and discloses a safety protection device special for an aluminum plate production cold rolling mill and a using method. The safety protection device comprises a protection column, clamping bases are fixedly connected to the two sides of the protection column, positioning blocks are fixedly connected inside the clamping bases, sliding ways are fixedly connected inside the positioning blocks, and reset springs are fixedly connected inside the sliding ways; a movable contact on a movable plate is in contact with a static contact on a fixed plate, so that the static contact is in contact with the movable contact, a circuit on an electromagnet is switched on, the electromagnet attracts a permanent magnet in a locking block, the permanent magnet drives the locking block to slide towards the inner side, the locking block slides into a clamping groove, and the locking block locks the protection column and the clamping bases; the protection column is fixed by the clamping bases, strong vibration is avoided, safety of the protection device in a working process is improved, the device can prevent strong vibration in a using process, and the device can be flexibly disassembled and moved when not used.

The invention discloses a measuring device for civil engineering construction. The measuring device comprises a base and a level gauge, wherein four corners of the bottom end of the base are connected with casters through buffer mechanisms; the four corners of the base are in threaded connection with positioning bolts; side plates are vertically fixed on two sides of the upper end of the base; a mounting plate is arranged between the two side plates; an adjusting mechanism is arranged between the mounting plate and the base; a limiting mechanism is arranged on one side of the bottom end of the adjusting mechanism; a supporting mechanism is arranged at the front end of the mounting plate; guide blocks are fixedly connected to two sides of the mounting plate; side grooves are formed in opposite sides of the two side plates; and guide plates are vertically fixed in the two side grooves. The measuring device disclosed by the invention has the beneficial effects that the measuring device can adapt to level gauges of different specifications and is high in adaptability, the height of the level gauge can be adjusted, the measuring device is conveniently adapted to actual conditions, and the operation is convenient. When the staff needs to record measurement data, the supporting plate is pulled out, the record book is supported by the supporting plate, the staff can conveniently record the work, and the functionality is high.

The invention discloses a method for coping with the fall of a spent fuel container. Vibration reduction setting is performed in a loading well or a cleaning well, so that the impact energy can be absorbed when the spent fuel container falls. The invention also discloses an anti-fall impact device. The device includes a vibration reduction unit and a supporting unit; the vibration reduction unit includes a vibration reduction body, and the supporting unit is arranged outside the vibration reduction unit to protect the vibration reduction unit. The invention further discloses the loading well/cleaning well in a nuclear fuel plant. The loading well/cleaning well comprises a wall body, a bottom plate, and the above anti-fall impact device, and the device is arranged on the bottom plate. The loading well/cleaning well can reduce the impact force of the fall and avoid causing strong vibration, thereby effectively reducing the impact effect on a main structure and peripheral equipment.

The invention relates to a hoisting type universal rotor critical rotating speed testing device which comprises a high-speed motor, a coupler, a bearing pedesatl, a flange support and an equipment support. An output shaft of the high-speed motor is connected with the coupler through a flexible connecting disc structure, and the coupler is installed in the bearing pedestal through a high-speed bearing; the bearing pedestal is connected with the flange support through a circumferential vibration damper, and the flange support is fixed on the equipment support. According to the invention, by adopting the flexible connecting disc and the circumferential vibration damper structure, strong vibration generated by the rotor at the critical rotating speed can be overcome during an overspeed experiment, so that the mechanical safety performance of the rotor after passing through the critical rotating speed can be tested.