46results about How to "Accurate force measurement" patented technology

The invention discloses a vacuum plume aerodynamic force measuring system and method. The vacuum plume aerodynamic force measuring system comprises a vacuum chamber, an engine, a force measuring model, a plume protection cover, a displacement mechanism, a mounting base and a six-component balance force measuring system. According to the vacuum plume aerodynamic force measuring system and method, a small-range six-component balance is used as a force measuring element for directly measuring vacuum plume aerodynamic force, so that a measurement result is more accurate; according to the characteristics of high speed and high temperature of engine vacuum plumes, duralumin is used as a material for designing the force measuring model and the plume protection cover, so that the force measuring model and the six-component balance are prevented from being damaged; the displacement mechanism is used for driving the six-component balance and the force measuring model to scan a plume field, and aerodynamic force measurement can be conducted at multiple positions under multiple working conditions in one close-cabin experiment. The vacuum plume aerodynamic force measuring method comprises the following steps that the six-component balance is calibrated, a six-component balance working formula is calculated, experimental equipment is installed, the experiment is conducted, and data are processed.

The invention relates to a multifunctional digital display force measuring instrument, which comprises a reverse force holding frame. The multifunctional digital display force measuring instrument is characterized in that: a force applying mechanism with a pull rod is arranged on the reverse force holding frame, the pull rod arranged above the reverse force holding frame is sleeved with a cylinder bushing type pressure sensor and a digital display instrument connected with the cylinder bushing type pressure sensor. The multifunctional digital display force measuring instrument is mainly used for force value inspection in architectural engineering.

The invention discloses a device and method for measuring stress of a coal particle in a concentrated phase gas-solid fluidized bed, belonging to the device and the method for measuring the stress of the coal particle. The device comprises a gas-solid fluidized bed, an air distributing chamber, an air flow distribution plate, a flexible rope and a high-precision contact tension device, wherein high-density magnet mineral powder is put in a gas-solid fluidized bed body statically, compressed air is fed into the gas-solid fluidized bed after being uniformly distributed through the air flow distribution plate through the air distribution chamber, after a fluidizing state is stabilized, the coal particle is tightly connected with the flexible rope and irregularly moves in the fluidized bed, stress information is measured by the high-precision contact tension device in real time, a voltage signal is converted into a mechanical signal through a signal converter, and then the mechanics signal is transmitted to a data acquisition and output device and is displaced on a data signal display after being processed by the stress information. The device and method have the advantages of simple structure, convenience in operation, easiness in control, high measurement precision and good reliability, capability of realizing accurate stress measurement of multiple large-size particles in a concentrated gas-liquid multiple-phase flow, and wide application range.

The invention relates to a six-dimensional force measuring device and method based on viscous-elastic material polishing, and belongs to the technical field of ultraprecision machining and complex optical element machining and measurement and control. A polishing head with a viscous-elastic material layer is mounted in a clamp spring, the clamp spring is mounted in a groove in the front end of an elastic main body, the clamp spring makes attached contact with the inner wall of the groove in the front end of the elastic main body, and an internal thread fastening cap is connected to the front end of the elastic main body through a thread; force sensing devices in parallel connection are preloaded to the elastic main body and clamped into grooves distributed in the periphery of the elastic main body in a square shape; and an outer sleeve and the elastic main body are connected through sleeve preloaded screws, a lower cap and the elastic main body are connected through lower cap preloaded screws, and a transmission part is suspended in an expectant closed space formed by the lower cap, a contact ring and the outer sleeve. The six-dimensional force measuring device has the advantages that online precision measurement can be achieved, the coupling degree is small, the transverse force interference is small, six-dimensional force can be accurately and precisely measured in real time, and mounting and dismounting are convenient.

The invention discloses an electric hoist handle, which comprises a main shaft. A connecting plate, a display screen box, a connecting ring, a handle and a lifting ring are sequentially arranged on the main shaft from top to bottom; the two ends of the connecting plate are connected with the display screen box through bolts respectively; a locking nut in threaded connection with the top end of themain shaft is in press fit with the upper surface of the connecting plate; a connecting cylinder is installed on the connecting plate through bolts; and a steel wire rope fixing shaft coaxial with the main shaft is in interference fit in the connecting cylinder through a thrust ball bearing. The electric hoist handle makes the handle and the lifting appliance combined into a whole, is compact instructure, and can be suitable for hoisting small-size objects; the steel wire rope fixing shaft can rotate along the main shaft through cooperation of the thrust ball bearing and the steel wire ropefixing shaft, so that winding prevention of a steel wire is achieved; and tension and pressure sensors are arranged in the connecting ring and embedded in the main shaft, and are equipped with sensorbase plates, so that external interference is greatly reduced, and force measurement is more accurate.

The invention relates to the technical field of aircraft component detection, in particular to an aircraft throttle lever testing device. The testing device comprises a testing platform and a testingmechanism, wherein the testing mechanism is arranged on the testing platform and comprises a driving assembly and a clamping assembly connected with the driving assembly; the driving assembly is suitable for driving the clamping assembly to rotate; a rotating axis of the clamping assembly and a rotating shaft of a throttle lever are coaxially arranged; the driving assembly is provided with a forcemeasuring unit; and the force measuring unit is suitable for measuring the loading force of the throttle lever when the clamping assembly rotates. On one hand, the stress direction of the clamping assembly on the throttle lever is the tangential direction of an arc-shaped track, which is consistent with the force application direction of the hand on the throttle lever when the throttle lever is operated by the hand, so that the running condition of a throttle table in actual use is accurately judged; and on the other hand, the force measuring unit is mounted on the driving assembly, so that tiny errors caused by slight relative sliding are avoided, and force measurement is more accurate.

The invention relates to a double-disc type lubricating oil traction force testing machine, which comprises a motor I, a motor II, a coupling I, a coupling II, a lower disc shaft, an upper disc shaft, a lower disc, an upper disc, a hydraulic loading mechanism and a force testing mechanism. With the testing machine of the present invention, real working conditions of the lubricating oil under an elastohydrodynamic lubrication state can be simulated, a rolling movement between the corresponding transmission contact members is accompanied with a sliding movement, continuous loading can be achieved, and the lubricating oil traction force under an elastohydrodynamic lubrication state can be accurately measured.

A gearbox gear shift mechanism force measuring device comprises a fixed base frame and a moving base frame which are arranged on a table board. A lower bracket is arranged on the outer side of the fixed base frame. A horizontal transverse shift mechanism is arranged on the lower bracket. The horizontal transverse shift mechanism comprises a left-right transverse shift screw rod supported by the lower bracket and a transverse shift slider connected in a threaded manner to the transverse shift screw rod. A vertical frame is arranged on the transverse shift slider. A vertical lifting mechanism isarranged on the vertical frame. The vertical lifting mechanism comprises a lifting screw rod supported by the vertical frame and a lifting slider connected in a threaded manner to the lifting screw rod. A support seat is arranged on the lifting slider. A horizontal longitudinal shift mechanism is arranged on the support seat. The horizontal longitudinal shift mechanism comprises a front-back longitudinal shift screw rod supported by the support seat and a longitudinal shift slider connected in a threaded manner to the longitudinal shift screw rod. A digital display tension meter is fixed on the longitudinal shift slider. The test rod of the digital display tension meter is connected with a force measuring connector. The gearbox gear shift mechanism force measuring device can adapt to theforce measurement of gearbox gear shift mechanisms with different specifications. The force measuring process is stable. The measured data is accurate. The device is convenient and labor-saving.

A portable intelligent fitness device is disclosed in the invention, and comprises a shell with an opening in the top and a top cover covering the opening in the top of the shell, a circuit mainboard, a force measuring mechanism and a battery module are arranged in the shell, the force measuring mechanism is connected with the top cover, and a switch button and a display module are arranged on the side wall of the shell. The force measuring mechanism, the battery module, the switch button and the display module are all electrically connected with the circuit mainboard, and the circuit mainboard comprises a Bluetooth module and a feedback module. According to the portable intelligent fitness device provided by the invention, the force measurement precision of the force measuring mechanism is high, and a user can feel the change of force through touch feeling and visual feeling, so that the user can be better guided to exert force, keep force and relax in the fitness process; and meanwhile, the Bluetooth module is arranged, so that the mobile terminal can give reasonable fitness suggestions to the user in combination with the fitness historical data of the user.

The invention discloses a transparent resistance type pressure sensor. The sensor comprises a pressure substrate and a support substrate which are oppositely arranged, and a plurality of mutually separated pressure-sensitive units are uniformly distributed between the pressure substrate and the support substrate; each pressure-sensitive unit comprises a pressure-sensitive film, and the pressure-sensitive film comprises an optically transparent elastic polymer and conductive nanoparticles; the nanoparticles are distributed on the surface and inside of the elastic polymers and are reticular, and at least one conductive channel is formed; the pressure-sensitive units deform to cause resistance change when being subjected to pressure applied to one side of the pressure substrate, and when the pressure on one side of the pressure substrate is removed, the resistance and the shape of the pressure-sensitive units are restored to the initial state. The invention further discloses an electronic system applying the transparent resistance type pressure sensor to multi-point touch detection hardware and software. The pressure sensor is sensitive to pressure and good in use durability.

The invention provides a flexible jack. The jack comprises a cylinder, a piston rod and a piston; the piston divides the cylinder into an upper oil cylinder and a lower oil cylinder, a pressure oil nozzle is arranged on the lower portion of the lower oil cylinder, and a pressure relief oil nozzle is arranged on the upper portion of the upper oil cylinder; a flexible cavity is formed in the portion, away from the ejection end of the piston or on a lower convex block at the bottom of the cylinder, of the piston rod, the flexible cavity is internally provided with a flexible pressure-bearing capsule matched with the cavity shape, a flexible pressure-bearing capsule mat is arranged on the portion, located at an opening of the flexible cavity, of the flexible pressure bearing capsule, the areaof the flexible pressure-bearing capsule mat is equal to the effective output area of the lower oil cylinder, and the flexible pressure-bearing capsule mat is fixedly connected with the opening of theflexible cavity; the flexible pressure-bearing capsule is communicated with the lower oil cylinder through an oil through hole. Accordingly, a force transferring path is definite, the problems that in an existing rock mass mechanics test, a hydraulic (force) steel pillow, the flexible jack and an ordinary jack are used, rock mass stress measurement is inaccurate, compressive rock mass or rigid plate stress is nonuniform, and deformation deviation exits are solved, and the rock mass mechanics test quality is improved.