181results about How to "Reduce volume" patented technology

The invention relates to a wireless monitoring system and method for a modal parameter of a blade of a fan. The method comprises the following steps of: A, collecting a vibration acceleration signal of a blade according to periods; B, processing the signal collected in the step A to obtain a digital signal; C, processing the digital signal obtained in the step B to obtain the modal parameter of the blade, and meanwhile, reading the air speed of the fan and variable pitch data; D, storing the data obtained in the step C, and transmitting the data to a remote analysis terminal; and E, carrying out analytical calculation on the data to obtain the inherent frequency and vibration mode of the blade. The system comprises a coordinator and more than one sensor fixedly arranged on the blade. By using the wireless monitoring system for the modal parameter of the blade of the fan, provided by the invention, the real-time modal parameter of the blade of the fan can be obtained through monitoring the vibration of the blade; the monitoring method and a mounting way are simple; no strain gauge is used, and correction on a result is not needed; and the test process is independent from the operation process of the fan, therefore, stopping of the fan is not needed.

An agricultural vehicle having a hydraulic system, a cab for the vehicle operator includes a self-levelling cab suspension system having a plurality of suspension units each having a spring, a damper and an accumulator. The accumulator comprises a hydraulic working chamber which is separated by a movable wall from a gas filled chamber serving as a spring. The working chamber is also connected to a working chamber of the damper in a closed hydraulic circuit. In the invention, there is no need for a dedicated oil pump since a hydraulic actuator powered by the vehicle hydraulic system is provided for causing hydraulic fluid to flow in the closed hydraulic circuit between the working chamber of the accumulator and the damper, to vary the height of the cab without fluid from the vehicle hydraulic system entering or leaving the closed hydraulic circuit of the damper and accumulator.

The invention discloses a focal length adjusting apparatus for a VR device. The apparatus comprises a rotating wheel, a left cross-arm wheel, a right cross-arm wheel, a left folding-arm wheel, a right folding-arm wheel, a left vertical wheel arm and a right vertical wheel arm, wherein a wheel disc rotates the rotating wheel, the wheel disc drives the left cross-arm wheel and the right cross-arm wheel to rotate, the left cross-arm wheel and the right cross-arm wheel drive the left folding-arm wheel and the right folding-arm wheel to rotate, and the left folding-arm wheel and the right folding-arm wheel then respectively drive the left vertical wheel arm and the right vertical wheel arm to rotate in a vertical direction. Besides, the invention further provides a VR device. Back-and-forth adjustment of a front cover is realized through the focal length adjusting apparatus for the VR device. Compared to the prior art, the VR device provided by the invention is firm in structure, improves the internal structure of virtual reality goggles, saves space, reduces the volume, at the same time, also reduces the weight, and enables a user wearing the goggles to have better experience.

The invention provides a power line carrier communication terminal device which comprises a power line carrier power adapter system used for allowing a strong-current power supply to be subjected to voltage reduction processing for outputting a low-voltage power supply, a signal modulation-demodulation system used for modulating/demodulating signals, and a signal transmission device used for transmitting low-voltage power supply and power line carrier signal, wherein the power output interface of the power line carrier power adapter system is connected with the power input interface of the signal modulation-demodulation system through the signal transmission device, so as to supply low-voltage direct current supply; and the power line carrier signal transmission interface of the power line carrier power adapter system is connected with the power line carrier signal transmission interface of the signal modulation-demodulation system through the signal transmission device, so as to realize the power line carrier signal communication. The device provided by the invention solves the electric safety problem, has an integrally reduced size and brings convenience for integration.

The invention relates to an edge-emitting semiconductor laser chip testing system, which comprises a feeding area, a discharging area, a testing area and a material taking mechanism. The testing area comprises a plurality of testing carrying tables, the material taking mechanism comprises a plurality of material taking heads and a rotating shaft used for driving the material taking heads to rotate, and the feeding area, the discharging area and the testing carrying tables are arranged around the rotating shaft. The surrounding direction of the feeding area, the discharging area and all the testing carrying tables is consistent with the rotating direction of the rotating shaft, all the testing carrying tables are located on the surrounding path between the feeding area and the discharging area, the number of the feeding area, the discharging area and all the testing carrying tables is the same as the number of all the material taking heads, and the feeding area, the discharging area and all the testing carrying tables are arranged in a one-to-one correspondence mode. The invention provides an edge-emitting semiconductor laser chip testing method. By means of the surrounding type layout, the actions of feeding, testing and discharging can be completed through rotation of the rotating shaft, excessive bypassing operation paths are avoided, the size of the system is greatly reduced, and the occupied area is reduced; and chips are synchronously carried, so that the chip carrying time is greatly shortened.

The invention relates to a watertight and fireproof door and in particular relates to a hydraulic embedded type watertight and fireproof hatch cover. The hydraulic embedded type watertight and fireproof hatch cover comprises a cover plate, wherein a coaming is formed at the periphery of the cover plate, one group of corresponding sides of the coaming and the cover plate are matched in a hinge joint manner, and a locking mechanism is arranged between the coaming and the cover plate; and a sealing strip is arranged between the coaming and the cover plate, so that the coaming and the cover plate are in seal fit when the cover plate is closed. The hydraulic embedded type watertight and fireproof hatch cover has the characteristics that a circumferentially arranged first fireproof strip is arranged at the periphery of the cover plate, a circumferentially arranged second fireproof strip is arranged on the inner side surface of the coaming, the first fireproof strip is corresponding to the second fireproof strip in position, and a gap is formed between the first fireproof strip and the second fireproof strip. The hydraulic embedded type watertight and fireproof hatch cover is simple in structure and small in size, has watertight and fireproof functions and can be applied to a ship deck with higher operation requirement.

A pressure control valve of a supercritical refrigeration cycle small in size and resistant to the effects of the outside air temperature, that is, a pressure control valve of a vapor compression type supercritical refrigeration cycle wherein a refrigerant is sealed in a sealed space at the top of the diaphragm, pressure of the refrigerant in the refrigeration cycle acts on the valve connected to the diaphragm, the valve opens and closes in accordance with the balance between the refrigerant pressure in the sealed space and the refrigerant in the refrigeration cycle, the sealed space is communicated with locations substantially having temperature sensing functions detecting the refrigerant temperature, and the volume of the locations substantially having the temperature sensing functions is at least 50% of the total volume of communicated with the sealed space.

The invention provides a microwave RF receiver, and relates to the field of microwave RF technologies. The receiver comprises a receiving antenna, a microwave amplification circuit, an inverse spinning Hall heterostructure demodulating device, an electric-control electromagnet, a microvolt voltage amplification circuit and a sampling circuit; the microwave amplification circuit carries out gain amplification on electromagnetic wave signals in the RF microwave frequency range; the electric-control electromagnet is arranged in a controllable current control circuit and provides a bias magnetic field; the inverse spinning Hall heterostructure demodulating device implements magnetic-field frequency selection by utilizing the bias magnetic field provided by the electric-control electromagnet and processes microwave signals output by the microwave amplification circuit; the microvolt voltage amplification circuit carries out signal amplification on a voltage generated by the inverse spinning Hall heterostructure demodulating device; and the sampling circuit samples voltage signals output by the microvolt voltage amplification circuit. The microwave RF receiver is simple in structure and smaller in sizes, has no problem of image frequency interference, and can realize rapid broadband scanning.

The invention provides a heart defect occluder comprising a supporting frame and a side locating body arranged on the side of the supporting frame. The supporting frame is provided with an accommodating groove in the middle; the bottom end of the accommodating groove is open; the accommodating groove of the supporting frame is provided with a side catheter communicating with the side locating body; the side catheter is used for injecting fluid into the side locating body to force the side locating body to expand outward or stretch outward. The side of the supporting body is provided with the side locating body; during use, after scanning a heart defect part of a patient with an instrument, a support can be formed through a 3D printing die making and the side locating body can be mounted on the support; through inflation or fluid injection, the radial size of the heart defect occlude can be changed, so that the heart defect occlude can best fit the defect part of the patient.

The invention discloses a folding type aerial photography aircraft. The folding type aerial photography aircraft comprises an unmanned aircraft fuselage, wherein the unmanned aircraft fuselage is movably connected with multiple supporting arms, the supporting arms rotate around the unmanned aircraft fuselage to unfold or rotate to enter the unmanned aircraft fuselage, the supporting arms are movably connected with propeller components, the propeller components rotate to unfold or are folded above the supporting arms, the unmanned aircraft fuselage is movably connected with a pan-tilt, and a camera is arranged on the pan-tilt. Through the way, the folding type aerial photography aircraft disclosed by the invention can reduce the volume of the aerial photography aircraft, saves the space, and is easy to carry.

The invention discloses a two-roll tandem pipe mill and a roll framework locking device thereof. The roll framework locking device comprises a pressing device and a side locking device. Rolls of the roll framework include a first roll and a second roll parallel to each other. After the roll framework is mounted into a main base, the side locking device is used for longitudinally locking the rolls of the roll framework, and the pressing device is used for pressing from the first roll to the second roll of the roll framework. The side locking device comprises a locking cylinder and a pressure-bearing backing plate, wherein the locking cylinder is arranged at the back end of the main base, and an extending end of the locking cylinder is a locking press head, a first bevel is formed on the locking press head, and a second bevel matched with the first bevel to lock the rolls longitudinally is formed on the pressure-bearing backing plate arranged at the back end of the roll framework. By the roll framework locking device, the problem of keeping horizontal rolling balance of the roll framework of the two-roll tandem pipe mill in the prior art is solved, stability of the roll framework in rolling is guaranteed effectively, and steel pipe rolling quality is improved further.

The invention discloses a swinging and obstacle crossing mechanism of a high-voltage line walking robot. The mechanism comprises walking wheels, a supporting plate and a supporting frame; the walkingwheels are connected to a hub motor; the hub motor is installed at the upper end of the vertical section of the L-shaped supporting plate; an electric locking mechanism is installed in the position, below the walking wheels, of the supporting plate; the electric locking mechanism can lock a high-voltage line onto the walking wheels; the lower side of the horizontal section of the L-shaped supporting plate is hinged to the upper end of the supporting frame; one side of the lower end of the supporting frame is hinged to one end of an electric push rod; and the other end of the electric push rodis hinged to the lower side of the end of the horizontal section of the L-shaped supporting plate. According to the mechanism, power is provided for the robot to move forwards along the line during line patrol, and a series of actions such as electric wire disengaging, electric wire grabbing, electric wire locking and the like required by obstacle crossing can be completed during obstacle crossing.