Abstract:
A variable load cell arrangement operative for precisely measuring loads over a range beyond the range of a single conventional single low range load cell. The arrangement includes a low range measuring element positioned in a case and having one end adapted to be connected through the case to a load and the opposing end coupled to a fixed reference. A variable pressure means, such as a controllable bellows, is interposed in the case between the load element and an end of the case whereby a predetermined force may be selectively applied to the load measuring element in a direction opposing the load to relieve the strain on the element and permit it to continue to function in an extended range. Electrical circuits, including Wheatstone bridges, are coupled to the load measuring element and provide an electrical output indicative of the applied load and an electrical output that is used to control the variable pressure means.
Abstract:
A force balance transmitter having a substantially flat base plate detachably carrying a primary unit and a secondary unit on an upper substantially flat surface thereof. A bell crank flexure pivot operatively interconnects a primary arm of the primary unit to a secondary arm of the secondary unit.
Abstract:
A linkage for use in moment balancing measuring apparatus of the pneumatic type includes first and second pivotally mounted levers, the second lever being adapted to be acted upon by a measuring force and the first lever being adapted to be acted upon by a pneumatic force for balancing the linkage. According to the invention, apparatus are provided for adjustably varying the leverage ratio of the linkage, i.e., the ratio of the pneumatic force to the measuring force according to the particular application to which the linkage is put. The leverage ratio adjusting apparatus includes a rod-like member having one end rotatably attached to one of the levers and first locking means for selectively securing the rod-like member in a particular position corresponding to the particular application to which the linkage is put.
Abstract:
In the several preferred embodiments of the present invention disclosed herein, a pneumatic controller is provided with a depending flexible vane which is cooperatively arranged and positioned to be moved in relation to a gas-bleed orifice for selectively regulating the pressure of a gaseous control media being supplied to a pressure-responsive control device. To control the movements of the vane, a variable force is applied to the vane to selectively deflect it in response to variations of a measured condition. Proportional feedback is provided in a unique fashion by supplying the regulated gas to one or more nozzles which are arranged to jet gas against the vane for reestablishing the equilibrium of the vane in accordance with the regulated gas pressure.
Abstract:
Provided are a device and a measuring method for measuring an unbalanced moment on a bottom surface of a circular valve core. The device includes a diverging shaped tube, a water tank, a transparent tube, spring dynamometers, laser sources, a circular valve core, and a high-speed camera with a camera stand. Inner shackles and the laser sources are evenly distributed on an outer side of the circular valve core of the device, the spring dynamometers are connected with the inner shackles and with the outer shackles evenly distributed on an inner wall of the transparent tube. The method records an unbalanced state of the circular valve core under an impact of water flow from different orientations with the high-speed camera on the camera stand, the location of the laser point on the outer wall and a tension force of the spring dynamometer are read to calculate a torque of the circular valve core.
Abstract:
Les cylindres d'impression (4, 5) de la machine presentent des bagues (4a, 5a) (bagues dites de Schmitz) qui sont soumises a une pression mutuelle quand la machine est en marche. Le reglage de la force de pression agissant entre les bagues (4a, 5a) est essentiel pour la duree de service et pour le bon fonctionnement de la machine: pour cette raison on propose un procede et un dispositif ayant le but de determiner cette force de pression. Le dispositif consiste en une chambre (8) en deux pieces disposee dans l'interstice (3) entre les cylindres et qui est mise sous pression.
Abstract:
A zero-strain soil pressure sensor includes a shell provided with a hydraulic oil cavity and a cavity located below the hydraulic oil cavity, a processor, an outer elastic film arranged at the upper end of the hydraulic oil cavity, an inner elastic film arranged between the hydraulic oil cavity and the cavity, an outer strain bridge circuit connected with the outer elastic film, an inner strain bridge circuit connected with the inner elastic film, a piston communicated with the hydraulic oil cavity, and a driving mechanism connected with the piston. The outer strain bridge circuit, the inner strain bridge circuit and the driving mechanism are electrically connected with the processor. The invention has the beneficial effect that the piston is driven by the driving mechanism to control the oil pressure in the hydraulic oil cavity, external soil pressure is balanced through the oil pressure to keep the outer elastic film in an non-deforming state all the time, and only the inner elastic film is deformed, so that the soil arch effect and soil displacement are avoided, and thus the liquid pressure measured by the inner elastic film is the soil pressure, and the measurement result is more accurate.