Abstract:
A horseshoe load cell is designed to aid in optimizing sucker rod oil production, to improve the installation and removal process for polished rod load cells. This device includes top and bottom washers, a retaining plate and associated bolts. The washers may be used to hold the load cell in the proper position on the polished rod. These washers may also be made in a variety of sizes to accommodate a range of polished rod sizes. An anti-rotation bar can be included to eliminate conflicts between load cell cabling and rod-rotator operation. The anti-rotation bar may have a hole for a quick link to absorb cable tension, reserving the cable strain relief for weatherproofing. The combination of the washers, the specially designed arms and the hole placement in the arms centers the load between the strain gauges, maximizing measurement accuracy. Two sets of strain gauges may be placed on each arm symmetrically around the rod string, providing an effective measurement method. Varying arm sizes and hole placements can be included to allow for different load ratings.
Abstract:
The invention relates to a method for determining the elastic deformation of components, especially parallel kinematic devices, under a load. Said method is characterised in that the geometry of the articulation points on the fixed platform (9) and the mobile platform (10) is determined; the replacement spring constants of the actuators (K1, K2, K3) and the replacement spring constants of the bearings are determined; the theoretical length of the actuators is determined; the theoretical position of all of the articulation points in the area is determined therefrom; the forces acting on the individual actuators are determined from said geometry and the load (F); and the real geometrical image and thus the real position of the mobile platform are determined from said forces. The real position is compared with the calculated theoretical position and is brought into line by the actuation of corresponding actuators.
Abstract:
The invention discloses a weighing sensor and an electronic scale provided with the same. The weighing sensor comprises a flat plate formed into helical shape, including successively a load-supporting portion, a strain portion and a bearing portion from the center to the outer of this plate, with the load-supporting portion situated between and surrounded by the bearing portion and the strain portion; wherein the load-supporting portion and the bearing portion are respectively used to bear the acting force and the reaction force in opposite directions, and a strain gauge is mounted on the strain portion. The electronic scale comprises at least three weighing sensors, wherein the bearing portion of the sensor is mounted on the scale body, the load-supporting portion directly contacts the supporting leg of the scale, which contacts the plane on which the scale is positioned. The present invention has small thickness, simple structure and low manufacturing cost.
Abstract:
Testing system for measuring closure pressure between jaw members of electrosurgical forceps. The testing system includes a testing platform, a pair of selectively adjustable instrument supports, a testing stand. The platform has an elongated bed that supports an instrument rest, which supports the electrosurgical forceps. The pair of instrument supports are associated with the elongated bed and secure the forceps atop the elongated bed. The testing stand is disposed at a distal end of the elongated bed and supports a piece of testing material. The testing stand includes a layer of visco-elastic material and a pressure sensitive film. The layer of visco-elastic material forms a pocket. The pressure sensitive film is disposed within the pocket of the visco-elastic layer. The pressure sensitive film is adapted to electromechanically communicate with a diagnostic system to measure the closure pressure between jaw members when they are in a clamped configuration.
Abstract:
A sensing insert device (100) is disclosed for measuring a parameter of the muscular-skeletal system. The sensing insert device (100) can be temporary or permanent. Used intra-operatively, the sensing insert device (100) comprises an insert dock (202) and a sensing module (200). The sensing module (200) is a self-contained encapsulated measurement device having at least one contacting surface that couples to the muscular-skeletal system. The sensing module (200) comprises one or more sensing assemblages, electronic circuitry (307), an antenna (2302), and communication circuitry (320). The sensing assemblages are between a top plate (1502) and a bottom plate (1504) in a sensing platform (121). The sensing assemblages comprise a load disc (2004) and a piezo-resistive sensor (2002) to measure the parameter. An elastic support structure or springs (1108) is coupled between the top plate (1502) and the bottom plate (1504) to prevent cantilevering of a surface.
Abstract:
The invention relates to a collision sensing device which can detect a collision between two or more objects. The collision sensing device comprises a deformable member (5) that defines a space (15) which can be assigned a pressure. In a first condition, the deformable member is undeformed, whereby the space (15) is assigned a first pressure (P1). In a second condition, the deformable member (5) is deformed whereby the space (15) is assigned a second pressure (P2). The pressure in the space is monitored. A collision with an object is detected when the pressure in the space changes from the first pressure to the second pressure.The invention can e.g. be applied in connection with machining, such as water jet cutting, but several other fields of application are also conceivable.
Abstract:
A spring force component tester for determining a load distribution on each end of a spring of generally cylindrical shape using three, mutually-parallel load cells. One tester includes a lower plate and an upper plate movable with respect to the lower plate. Each plate includes a plurality of recesses and a load cell positioned in each recess. Each plurality of recesses is positioned such that a center of each recess is a point on a circle coaxial to the plate. The tester also includes a data logger that obtains and stores load cell outputs from the load cells and spring tester electronics that obtain height measurements of the upper plate and send a trigger signal to a computer. The computer executes application software when the computer receives the trigger signal that reads the load cell outputs stored in the data logger, and calculates a spring force acting along the spring axis between approximately 0.5 Newton and 100 Newton.
Abstract:
The invention relates to a force-measurement cell for insertion in a bore of a pin, the cell comprising a bushing: having a generally cylindrical tubular wall with an outside surface adapted to extend against an inside surface of the bore in the pin; and within which there extends at least one sensor suitable for measuring at least one parameter representative of the stresses to which the wall is subjected. The invention also relates to a pin provided with such a force-measurement cell.
Abstract:
The invention relates to a non-destructive method for measuring the elasticity of templates of materials for lining automotive vehicle components, characterized in that it comprises the following steps: applying a tensile pre-load with a predetermined value P1 in a longitudinal direction to a template section (41); applying a tensile load with a predetermined value P2 in a longitudinal direction to said section (41) and measuring the longitudinal deformation produced; removing the load applied to said section (41) and measuring the residual longitudinal deformation produced. The invention also comprises an apparatus (11) for carrying out the method which comprises two fixing elements (15, 17) for fixing the section (41), one of which elements is a fixed element (15) and the other is a moving element (17), a device for applying a tensile load to the moving element (17) connected to a dynamometer (29), and a rule (31) for measuring the longitudinal deformation of said section (41).