30 results about "Moment equilibrium" patented technology

The invention discloses a quasi-static uniaxial compression experiment method and device for a compression test piece with a groove structure. The experimental device includes a compression fixture and a test piece. The compression fixture includes a compression platen at the top, a base support plate and a clamping portion for clamping the test piece; the test piece is a plate-shaped bone-type test piece, and the bone of the test piece There is a groove on one side of the reduced part of the profile; the top end of the test piece rests on the compression platen, the bottom end of the test piece rests on the base support plate, and the clamping part avoids the groove and is clamped on the upper and lower ends of the test piece . The invention also discloses an experimental method using the experimental device, according to the mechanism of moment balance between the bending moment and the normal force exerted by the back anti-bending plate on the groove part to suppress the buckling of the specimen, only in the The back side is supported laterally, while the groove on the front side is exposed, which is suitable for various strain measurements, and solves the problems of complicated processing technology, high cost, and difficult data measurement of the existing quasi-static uniaxial compression device.

The invention discloses a curvature-variable double parabolic plate rear support moment parallel structure. The structure comprises a base frame, a balance beam, a mirror unit, a jacking rod, a pull rod and a limiting rotating shaft, wherein the mirror unit is mounted on the balance beam through the limiting rotating shaft; the upper part of the mirror unit is connected with the balance beam through the jacking rod; the lower part of the mirror unit is connected with the balance beam through the pull rod; the balance beam is fixedly mounted on the base frame; the connection point of the balance beam and the base frame is the fulcrum of the base frame; the integral structure formed by the balance beam, the mirror unit, the jacking rod, the pull rod and the limiting rotating shaft has a zero resultant moment on the fulcrum of the base frame. According to the invention, a relevant support device is arranged according to the moment equilibrium principle to drive two parabolic solar reflectors; meanwhile, a limiting rotating shaft structure is arranged to connect the two parabolic reflectors, reliability and stability in mirror motion tracking are achieved through the support device during the operation of the device, adaptability to parabolic mirrors of different curvatures and different opening sizes is achieved through the limiting rotating shaft structure, and the support device is not only simplified but also enabled to operate effectively and reliably.

A torque-balanced flow distribution pair for water hydraulic axial piston pumps mainly comprises a floating liner plate, a floating bushing, a flow distribution disk, three eddy current micro-displacement sensors, an amplifying and conditioning circuit, a control unit and a power amplifier, wherein the floating bushing is mounted on one end of a floating disk, a ring-shaped electromagnet is mounted on the other end of the floating disk, and a circular electromagnet is correspondingly mounted in the low-pressure flow distribution area of the flow distribution disk. The hydraulic backward thrust of the low-pressure flow distribution area of the torque-balanced flow distribution pair can be automatically compensated, so that the stress between the two end surfaces of the flow distribution pair is more uniform, consequently, the unbalanced loading torque of the high-pressure flow distribution area is balanced, the abrasion of the low-pressure flow distribution area and the leakage flow of the high-pressure flow distribution area are reduced, not only can the volumetric efficiency and service life of a water hydraulic axial piston pump be increased and prolonged, but also the torque-balanced flow distribution pair is highly universal and is highly convenient to dismount, mount, replace and maintain, and the torque-balanced flow distribution pair is applicable to swashplate or angle type valve plate flow distribution hydraulic axial piston pumps with pure water as working medium.

The invention discloses a torque balance momentum law experimental device. The experimental device comprises a water storage tank and a working water tank arranged over the water storage tank, wherein the bottom opening of the working water tank is communicated with the water storage tank; the side wall of the working water tank is provided with a nozzle, a speed-adjustable water pump is arrangedin the water storage tank; the outlet end of the speed-adjustable water pump is connected with the nozzle by a water pipeline; the water pipeline is provided with a flowmeter; a fulcrum is arranged over the working water tank, an L-shaped lever is arranged on the fulcrum; a corner end of the L-shaped lever extends into the working water tank; the head of the corner end of the L-shaped lever is provided with a striking plate corresponding to the nozzle; the other end of the L-shaped lever is connected with one end of a support bar by an adjustable nut; a level bubble is arranged on the L-shaped lever, the other end of the support rod presses an electronic scale, and the striking plate is a flat or a spindle shell or a hemispherical shell. In the invention, a self-circulation water system is utilized, a method of lever torque balance is initiated, and a high precision electronic scale is initially adopted to directly measure the momentum force, thereby the torque balance momentum law experimental device is visual and intuitive. The invention is convenient to teach without the influence of the external force, and the data is more actual and reliable.

An integral lift-and-translate protective airtight door, the hinges of which are fixedly connected to the upper shaft seat and the lower shaft seat respectively, the two seats are connected by bearings to lengthen the hinge shaft, and the upper and lower hinge plates are connected to the upper and lower seat plates The upper and lower moment balance translation supports are connected between them, one end of the upper and lower moment balance translation supports is connected with the pin shaft of the upper and lower connecting seat plates, and the other end of the upper and lower moment balance translation supports is sleeved on the extended hinge shaft. There is a gap between the upper and lower torque balance translation bearings and the hinge shaft seat, and between the pin hole of the upper and lower torque balance translation bearings and the pin shaft of the connecting seat plate. The jack lifting device is set between the upper hinge and the lower hinge, and the square head at the lifting end is supported in the bearing groove of the load-bearing translation seat. There is a gap between the square head at the lifting end and the wall of the groove, and the inner wall of the groove has a Concave raceway with balls embedded in the raceway. It solves the problems of protection and airtightness caused by large spans, large longitudinal slopes, and large slopes, and can be widely used in protection projects.