Abstract:
A force sensor assembly incorporates an integrated plunger to provide an economical assembly which can be calibrated and mounted as a single unit. The force sensor assembly utilizes a retainer to movably capture a solid interface within an opening in the retainer. The solid interface includes a flange positioned within the assembly below the retainer opening. The flange dimensions are greater than the retainer opening to retain the solid interface within the assembly. The retainer is attached to a housing body having a gel filled cavity underlying the retainer opening. A diaphragm free floats on the gel within the housing body and contacts the solid interface. The gel transmits a force exerted on the diaphragm from the solid interface to a pressure sensor mounted at the base of the housing body cavity. A ceramic substrate having an integrated resistor network supports the pressure sensor and an amplifier. The pressure sensor and accompanying electronic components provide a conditioned electrical signal corresponding to the force applied to the solid interface.
Abstract:
A method and apparatus for determining the spring force of a closing spring upon the opening of a valve, the valve is connected by means of a connection to a pressurized-gas line in which a pressure measuring device and, upstream of the latter, a variable pressure-regulating valve, a shut-off valve and a pressurized gas source are arranged. The end of the valve opposite from the pressure line connection is connected to a flow meter. After the shut-off valve has been actuated into its open position, the control pressure regulated at its outlet by the pressure-regulating valve is changed in such a way that it rises. Once the control pressure has risen to a value at which the valve closing element rises from the valve seat, i.e., the valve opens, the flow meter transmits a measurement signal which characterizes the flow of pressurized gas and which is input into a control and evaluation unit in addition to the value for the control pressure determined by the pressure measuring device. From the control pressure determined, the control and evaluation unit calculates the spring force of the closing spring upon the opening of the valve. The method is suitable, for measuring the spring force of a closing spring of a fuel injection valve for internal combustion engines without having to remove any part of the fuel injection valve.
Abstract:
A vehicle testing device and method are provided whereby a mechanic can easily test the pneumatic brake systems of a tractor-trailer. The device is used by inputting into the device the electrical and pneumatic outputs of a tractor and by outputting electrical and pneumatic transmissions from the device into a trailer. The device accepts input from a tractor and produces output to a trailer for testing purposes. The testing device is compact and portable and affords a mechanic a convenient tool for efficiently carrying out the necessary safety tests on both the tractor and trailer which may be physically connected or disconnected at the time the testing occurs.
Abstract:
To measure pressure acting on a support (1), a sealed bag (2) which is filled with a fluid and has flexible bag walls (9, 10), and which is arranged on the support (1) and whose interior communicates with a flexible capillary tube (4, 4'), is used as a sensor. Connected to the free end of the flexible capillary tube (4, 4') is an evaluation device which detects pressure variation, it being possible for the end of the flexible capillary tube (4, 4') to be plugged into a block (5). The block has a bore (6) which continues the channel of the flexible capillary tube (4, 4') and is sealed at its end not: subjected to the flexible capillary tube (4, 4') by a diaphragm (7). The diaphragm bulges outwards in the event of a reduction in the volume of the bag (2). The extent of the outward bulging of the diaphragm (7) can be determined by an optical detector (15, 16).
Abstract:
A joint including an elastic connecting device includes a rigid element and a rigid outer element receiving the rigid inner element such that the rigid inner element is movable with respect to the rigid outer element. The rigid inner element and the rigid outer element have respective outer and inner facing surfaces. A bore is disposed in one of the rigid inner element and the rigid outer element, and the bore opens to one of the respective outer and inner facing surfaces. A force/pressure sensing arrangement is disposed in the bore, and a substantially incompressible fluid is sealed in the bore. Elastomeric material is disposed between the rigid outer element and the rigid inner element in force/pressure transmission contact with the force/pressure sensing arrangement. The rigid inner element has a central passage and a radially enlarged portion, and the inner surface of the rigid outer element has a contour generally complementary to the outer surface of the rigid inner element, so as to form an annular intermediate space at least partially occupied by the elastomeric material.
Abstract:
Measurement sensor for length or distance changes, particularly for non-contacting measurement of torques of rotating shafts. In known measurement sensors, the length or distance change (.DELTA.x) is amplified by a mechanical lever system and is then converted into an electrical quantity. In the novel measurement sensor of the present invention, the length or distance change (.DELTA.x) to be measured is transmitted to a displacer in order to enhance the precision. A displaced liquid, particularly mercury, is introduced into a capillary and the length of a liquid column in the capillary is converted into an electrical quantity, preferably as a change of a resistor. The new measurement sensor is particularly suitable for torque measurement.
Abstract:
A flat-spread force measuring apparatus comprising a stiff rigid main body having an essentially plane top surface for receiving a load; a plurality of flat cavities provided in said body spaced to each other and extending in parallel to said top surface; essentially bubble free elastomeric material contained in said cavities; a plurality of pressure sensors one each arranged in contact to said elastomeric material in each of said cavities; a plurality of force introduction members one each arranged in an essentially vertical alignment to said pressure sensors and below them; and evaluation means electrically connected to said pressure sensors for combining electrical signals received therefrom and representing local force components transmitted from said load receiving body through said elastomeric material to said pressure sensors.
Abstract:
A load cell includes a base (40) with a cavity (42) formed therein. A diaphragm (46) is disposed over the cavity (42) to form a chamber (48) that is filled with hydraulic fluid. A piston formed of two halves (60) and (62) is disposed adjacent the surface of the diaphragm (46). A high tensile strength resilient membrane (58) is disposed between the two halves (60) and (62) of the piston and secured thereto with bolts (64) and (66). A securing ring (68) secures the diaphragm (46) around the periphery thereof to the base (40). A securing ring (72) secures the peripheral edge of the membrane (58) to the securing ring (68). The membrane (58) provides tension forces about the periphery of the piston to impede lateral movement thereof to maintain the piston in the center of the cavity (42).
Abstract:
The pick-up is characterised in that it comprises a body which is flexible in its length and fixed in its cross-section and which is disposed between a plate for receiving the applied force and a support plate, the said body containing a liquid which converts the force into pressure, said body also being connected to a pressure transmitter.
Abstract:
An apparatus and method for facilitating the transfer of pipe sections between a vertical storage array and a power operated pipe elevator. A travelling block is equipped with a measuring arm to position the elevators relative to a pipe stand to be added to the drill string and taken from the storage array by a hydraulically powered pipe transfer device. After insertion of pipe by the transfer device, the elevators are automatically actuated by a contact arm mounted on the elevators. The contact arm signals the actuation of the elevators and withdraws transfer device. Pipe transfer from the storage array to the elevators and back again is semi automatic and under the supervision of the drilling crew.