30results about How to "Avoid mechanical noise" patented technology

A rain hat device for heavy construction equipment which is installed adjacent to an exhaust gas discharging port of a distal end portion of an exhaust pipe to prevent inflow of rainwater therein is disclosed. The rain hat device comprises a swing cover installed at a distal end portion of the exhaust pipe in a spaced and floated state so as to prevent rainwater from flowing in the distal end portion of the exhaust pipe, and in which the swing cover does not come into contact with the distal end portion of the exhaust pipe to prevent noise from being generated due to contact and collision when an engine stops or exhaust gas is not discharged.

The invention relates to the field of compressors, and discloses a suction and exhaust device used for a compressor and the compressor. The suction and exhaust device comprises an air cylinder body (1) and an air suction valve sheet (2), a cylinder hole (11) is limited in the air cylinder body (1), the air suction valve sheet (2) is arranged on a cylinder face (12), located on one end of the cylinder hole (11), of the air cylinder body (1) in parallel, the air suction valve sheet (2) is provided with a tongue spring (21) capable of swinging towards the cylinder hole (11), the air suction and exhaust device comprises a limiting part (22) on the tongue spring (21) and a limiting groove (13) formed in the cylinder face (12), the limiting groove (13) is arranged to be matched with the limitingpart (22) to limit swing of the tongue spring (21) towards the cylinder hole (11), and a buffer pad or damping coating is arranged in the limiting groove. The air suction and exhaust device can effectively reduce the noise generated by the tongue spring of the air suction valve sheet in the air suction process.

The invention particularly discloses a sound insulation device. The sound insulation device comprises an upper base plate, a side base plate and a lower base plate. A sound insulation top plate is arranged on the inner side of the upper base plate, and a sound insulation side plate is arranged on the inner side of the side base plate. A sound insulation bottom plate is arranged on the inner side of the lower base plate. A sealed space is formed by the sound insulation top plate, the sound insulation side plate and the sound insulation bottom plate. A first keel is mounted on the outer side face of the sound insulation top plate. A first damping device is arranged between the first keel and the upper base plate. A second keel is mounted on the outer side face of the sound insulation side plate. A second damping device is arranged between the second keel and the side base plate. Damping bricks are arranged between the lower base plate and the sound insulation bottom plate. The sound insulation device is reasonable in design, good in sound insulation effect and capable of weakening the intensity of sound spreading along different media and different directions in an all-dimensional manner.

The invention discloses a flow control low-noise soft valve driven by electric conjugate liquid. Two fluid outlets of a valve body are respectively communicated with a fluid inlet through an upper flow channel and a lower flow channel, an electric conjugate liquid cavity is arranged between the upper flow channel and the lower flow channel, electric conjugate liquid is stored in the electric conjugate liquid cavity, a flexible cathode and upper and lower flexible anodes are arranged in the electric conjugate liquid cavity, and the electric conjugate liquid cavity is connected with the upper flow channel and the lower flow channel. At the joint of the electric conjugate liquid cavity and the upper flow channel, an upper flexible valve is hermetically mounted at a port of the electric conjugate liquid cavity, and an upper groove is formed in the side wall of the upper flow channel. At the joint of the electric conjugate liquid cavity and the lower flow channel, a lower flexible valve is hermetically mounted at a port of the electric conjugate liquid cavity, and a lower groove is formed in the side wall of the lower flow channel. According to the flow control soft valve, electric conjugate liquid static pressure is actively controlled through voltage so as to control throttling and on-off of a loop, the response speed is high, and the flow control soft valve is suitable for controlling a driving fluid loop in a soft robot.

The invention discloses a rehabilitation type in-vitro counter-pulsation device. The rehabilitation type in-vitro counter-pulsation device is characterized by adopting a novel electric shrinkage-relaxation mechanism, a remote control module and a supporting device, wherein the electric shrinkage-relaxation mechanism comprises a step motor, a rolling shaft, a storage cavity, a guide shaft, a limiting plate and a counter-pulsation belt, and is used for periodic extrusion and relaxation of a counter-pulsation part; the remote control module comprises an input signal interface, a data processing module, a single chip microcomputer, an auxiliary circuit and an output signal interface, and is used for generating a control signal according to the input signal through a counter-pulsation algorithmand outputting the control signal to the electric shrinkage-relaxation mechanism; and the supporting device is used for attitude adjustment of the electric shrinkage-relaxation mechanism. The devicesolves the problems of great size, high noise and poor comfort of a gasbag type counter-pulsation device, realizes distributed type counter-pulsation, can realize remote-control operation, and is suitable for rehabilitation of the ischemic cardio-vascular disease.

The invention belongs to the related technical field of electromagnetic nondestructive testing, and discloses a defect detection method based on a ferromagnetic plate. The detection method comprises the following steps that: (1) a magnetic sensor is fixed on a ferromagnetic plate, wherein a through groove is formed in the ferromagnetic plate, the through groove penetrates through the ferromagnetic plate in the thickness direction of the ferromagnetic plate, and the through groove penetrates through the area, covered by the magnetic sensor, of the ferromagnetic plate; and (2) in a magnetizing field, defect scanning is performed on a magnetized workpiece to be detected by the magnetic sensor and the ferromagnetic plate, wherein a leakage magnetic field generated by the through groove under the action of the magnetizing field and a leakage magnetic field generated by a defect on the workpiece to be detected are mutually magnetized and enhanced. According to the invention, shaking is avoided, the wear resistance of the magnetic sensor is enhanced, on the other hand, the magnetic flux leakage detection signal is enhanced, and the magnetic flux leakage detection sensitivity is improved.

The invention discloses a plate painting apparatus, which comprises a conveying support roller and a painting system, wherein the conveying support roller is positioned at the inlet of the painting system, the painting system comprises a box body, a paint bin positioned in the box body and painting rollers, the painting rollers comprise upper painting rollers and lower painting rollers, two sets of the upper paint guide rollers and two sets of the lower paint guide rollers are respectively arranged, and the structures of the upper paint guide roller and the lower paint guide roller respectively comprise a rotating shaft and a paint guide brush arranged on the rotating shaft. According to the present invention, the paint guide rollers drive the plate to move forward while the plate is painted, such that the mechanical noise is avoided, and the work efficiency is increased; the painting work is completed in the box body so as to avoid the environmental pollution caused by paint splashing; and the excess paint automatically falls back to the bottom outlet of the box body, and then refluxes to the paint bin so as to be reused, such that the cost is reduced.

The invention provides a synchronizing device, a synchronizing device speed regulating system and a vehicle, and relates to the technical field of vehicles. The synchronizing device comprises a gear and an output shaft. A friction plate groove is formed in the inner ring of the gear. The output shaft is provided with an oil inlet hole with a sealed end and an oil outlet hole communicating with theoil inlet hole. The outer side of the output shaft is connected with a friction plate. The output shaft is arranged on the inner ring of the gear, and the friction plate is clamped on the friction plate groove. Hydraulic oil entering the output shaft from the oil inlet hole enters the friction plate groove from the oil outlet hole to push the friction plate, so that friction force is formed between the friction plate and the side wall of the friction plate groove, and the gear and the output shaft are synchronized. The synchronizing device is compact and simple in structure, and layout spaceis saved. According to the synchronizing device, mechanical devices (gear hubs, gear sleeves, soldered teeth and synchronizing rings) are omitted, secondary impacts are reduced, and mechanical noise of the end faces of the soldered teeth of a gear sleeving machine is avoided.

The invention discloses an ultra-silence underwater propeller. Mechanical noise generated by an engine and mechanical transmission cannot be generated. The ultra-silence underwater propeller comprisesa spindle-shaped shell, wherein a closed cavity is formed between a water inlet and a water outlet of the shell; the cavity is divided into three cavity bodies by two rubber plates installed on the shell; one-way valves are installed at water inlets and water outlets of the cavity bodies; and electromagnets are installed on the rubber plates.

A high-molecular resin used for ink powder of copier is prepared from styrene, butyl acrylate, divinylbenzene, dibenzoyl peroxide, edible gelatin and edible starch through proportional mixing, reaction, washing, dewatering, drying and sieving. Its advantages are no toxicity, low cost, and no pollution of environment.

The invention relates to a device and a method for reducing noise of a microwave oven. The device comprises an oil cooling system used for cooling anodes of magnetrons in the microwave oven. In the method, the oil cooling system is adopted to replace an air cooling system and perform radiating treatment on the magnetrons in the microwave oven. In the device and the method, the oil cooling system is adopted to replace the air cooling system; and compared with the air cooling system, the oil cooling system has higher radiating efficiency and radically solves the problem of mechanical noise of a fan so as to greatly reduce the noise when the microwave oven works.