115results about "Force measurement using counterbalancing forces" patented technology

An apparatus for measuring tension in guy wire systems wherein the lower end of the guy wire has a thimble adjoined by a connection pin to a yoke or clevis of a turnbuckle shackle bolt connected to an earth anchor. A block assembly is removably received beneath the clevis and a thimble-engaging jaw assembly is removably received on the guy wire above the clevis. The block assembly and jaw assembly are connected at one end by a threaded rod assembly that includes a strain sensor connected with an indicator device, and by a threaded rod at their opposed end. The jaw assembly is drawn downward by adjusting nuts on the threaded rods beneath the block assembly to engage the thimble and move it downward transferring the tension to the threaded rod and threaded rod assembly which is sensed by the strain sensor and indicated by the indicator device.

Apparatus is used in sensing a measured input. The apparatus includes a capacitor with a capacitance that varies non-linearly in response to the measured input, and a circuitry that derives, from the capacitance, a signal that varies substantially linearly with the measured input. The capacitor includes a first electrode, a second electrode, and a gap defined by a space between the electrode. The circuitry includes an amplifier with a first input terminal in electrical communication with the first electrode, a second input terminal, and an output terminal in electrical communication with the second electrode. The capacitance of the capacitor varies as an inverse of the gap of the capacitor, the gap of the capacitor varies in response to changes in the measured input, and the signal is derived from an output of the amplifier.

The invention provides a micro force measuring device, belongs to the technical field of micro force value calibration and measurement testing, and aims to solve the problems that the structure is complex, the action line of the force cannot be fixed easily, and the cost is high in the prior art. The micro force measuring device comprises an unequal arm balance, a force value replication device, a micro-displacement measuring device and a computer control system, wherein a tray is arranged at a long arm end part of the unequal arm balance; an edge cutter structure is arranged at a short arm end part; the edge cutter structure is connected with the micro-displacement measuring device through the force value replication device; the output end of the micro-displacement measuring device is connected with an insulating rod through a connecting sleeve; and the insulating rod is connected with a threaded hole in an upper end cover of an inner electrode of the force value replication device. According to the micro force measuring device, the force value replication device is used for replicating a micro force value, relative micro displacement of the inner electrode is measured through an improved digital display micrometer, the force value change is changed into the precision capacitance gradient change of an electricity quantity relative to the displacement, balance is formed through a lever structure and a standard weight dead weight force, the structure is simple, and the cost is lower.

A hydraulic lifting and weighing system particularly for refuse collection vehicles and the like and includes means for dynamically weighing garbage. The system includes a hydraulic actuator operable to move a lifting arm and takes two measurements of the pressure of the hydraulic fluid in the system as the arm raises a waste bin whose weight is to be measured. The weight of the bin is calculated by multiplying the pressure by a factor determined by calibration with known weights. Weights are calculated based on the measurements of pressure and the result averaged. The system compensates for variations in hydraulic flow characteristics. The system includes means for compensating for variations in the inclination of the vehicle.

An active micro-force sensor is provided for use on a micromanipulation device. The active micro-force sensor includes a cantilever structure having an actuator layer of piezoelectric material and a sensing layer of piezoelectric material bonded together. When an external force is exerted on the sensor, the sensor deforms and an applied force signal is recorded by the sensing layer. The applied force signal is then fed back to the actuating layer of the sensor via a servoed transfer function or servo controller, so that a counteracting deformation can be generated by the bending moment from the servoed actuating layer to quickly balance the deformation caused by the external micro-force. Once balanced, the sensor beam comes back to straight status and the tip will remain in its equilibrium position, thus the sensor stiffness seems to be virtually improved so that the accurate motion control of the sensor tip can be reached, especially, at the same time, the micro-force can also be obtained by solving the counteracting balance voltage applied to the actuating layer.

An end effector base and a finger unit are formed as separate members, and are disposed with a space therebetween. A force sensor is fixed to a finger base of the finger unit, and is disposed with a space between it and the end effector base. Three supporting members are supported by the end effector base, and are configured to be able to be moved by the driving of a driving unit to a position where they support the force sensor and a position where they are separated from the force sensor and support the finger unit.

The invention discloses an on-line monitoring method for large-scale wind power tower drum structure stress and belongs to the field of structure health monitoring. Since wind power tower drums are large in size and are located in harsh environment, traditional methods for measuring structure stress with strain gages require more strain gages, and the strain gages are not suitable for use in wind power tower drum structure stress monitoring methods due to the fact that the strain gages cannot be located in harsh environment for a long time. According to the on-line monitoring method for large-scale wind power tower drum structure stress, on the basis of the shaking characteristic of a wind power tower drum, shaking is divided into a shaking balance position and shaking amplitude around the balance position, the shaking balance position and the shaking amplitude correspond to mean stress and stress amplitude in alternating stress respectively, and a relationship between shaking and stress is established, so that structure stress of the wind power tower drum can be reflected by monitoring shaking of the wind power tower drum, and the problem that methods for measuring stress with strain gages are limited by structure sizes and work environment of wind power tower drums is solved. Besides, the on-line monitoring method is convenient, practical, and applicable to on-line stress monitoring of large-scale wind power tower drum structures.

The invention provides a lever type pressure sensor. The lever type pressure sensor comprises a lever (3), a pressure receiving component (1) and displacement sensing assemblies (5 and 6), wherein the pressure receiving component is connected to a first end of the lever and drives the first end of the lever to move when being pressed, and the displacement sensing assemblies are connected to a second end, opposite to the first end, of the level and can detect the displacement of the second end of the lever.

An elastomeric seat bladder has upper and lower sheets of peripherally welded elastomeric material, and at least one of the upper and lower sheets of elastomeric material is sufficiently thick to effectively serve as an integral interface panel. In a first configuration, the lower sheet is formed of elastomeric material having a thickness in the range of 1 mm (0.04 inch) to 2.54 mm (0.100 inch), and the upper sheet is formed of elastomeric material having a thickness of approximately 0.375 mm (0.015 inch). In a second configuration, the relatively thick sheet of elastomeric material is utilized as the upper sheet of the bladder instead of the lower sheet; and in a third configuration, both upper and lower sheets of the bladder are formed of elastomeric material in the range of 1 mm (0.04 inch) to 2.54 mm (0.100 inch) in thickness.

The invention relates to a drill hole vector stress sensor for a mine, which is strong, durable, convenient to install and capable of achieving omni-directional vector measurement. The drill hole vector stress sensor for the mine comprises a casing. A core body is arranged in the casing and provided with an integrated circuit module connected with the core body. The core body comprises a balance beam fixing support, and balance beam sensors are fixed on the balance beam fixing support and provided with force measurement nuts. Three balance beam sensors are fixed in a mode with 120-degree included angles formed between the balance beam sensors, and the integrated circuit module comprises two (analog to digital) A/D conversion modules and an electronic compass module which are respectively connected with the balance beam sensors. The casing is made of stainless steel materials. The core body and the integrated circuit module are arranged in the casing, and two ends of the casing are sealed by means of glue injection.

The invention belongs to the fields of machinery and test, and in particular relates to a small force measuring device. The small force measuring device comprises a workbench, a vertical ruler, a silk yarn, a horizontal ruler, a horizontal bracket, a dial needle, a positioning nut and weights, wherein the workbench consists of a horizontal platform, a vertical rod and a suspension arm; one end of the silk yarn is tied to the suspension arm, and the other end of the silk yarn is hung with the weight; the vertical ruler is fixed on the vertical rod of the workbench, and the horizontal ruler is fixedly connected with the horizontal platform of the workbench; one end of the horizontal bracket is used for fixing the fixing part of a measured object, and the other end of the horizontal bracket is provided with a positioning mechanism; and the movable part of the measured object is fixed with the dial needle. The device can measure small force through utilizing a simple principle, is reasonable and reliable in scheme and low in part dependence, does not use precise parts and is low in design and manufacturing cost; the temperature and humidity have small influence on a measurement result, and the device is low in environmental requirements; the device is simple in structure and high in measurement precision; the device is convenient to operate, does not need special training, and does not have special skill requirements, and data are convenient to read; and the device can also be a calibration device of a high-precision force transmission device.

The invention discloses a device and a method for measuring an unbalanced moment of the bottom surface of a round valve element. The device comprises a divergent type special-shaped pipe, a water tank, a transparent tube, a spring dynamometer, laser sources, the round valve element, a valve element bottom surface additional layer, a high-speed camera and a photographing support. Inner hook rings and the laser sources are uniformly distributed on the outer side of the circular valve element of the device; the spring dynamometer is connected with the inner hook rings and outer hook rings uniformly distributed on the inner wall of the transparent tube; and positioning scales are arranged on the outer wall of the transparent tube. According to the measuring method, the high-speed camera is erected on the photographing support to record an unbalanced state formed by the circular valve element under the impact of water flow in different directions; the scales, corresponding to the laser sources, on the outer wall and a pulling force of the spring dynamometer are read out; and a torque, corresponding to a certain specific symmetry axis, of the circular valve element is calculated. The device is simple in structure and easy to manufacture, and can be widely popularized and applied.

A combined pressure and temperature sensing device includes a sensor port geometry that provides improved contact between a fluid media being measured and a thermistor cavity of the sensor port. The increased contact area provides improved response time and accuracy compared to previously known integrated pressure-temperature sensors. A temperature sensor element is offset from a pressure sensor element relative to a central axis of the temperature-pressure sensor body/package to facilitate substantially increasing a pressures sensor cavity volume without increasing the overall sensor port diameter. A wire-bondable thermistor support portion facilitates high volume automated production line. The temperature sensing element may be resistance welded to the thermistor support portion in a parallel manufacturing process.

Apparatus for use in controlling snoring, including: a sensor system for sensing snoring by a person while sleeping, and a stimulus device effective, when actuated by the sensor system, to apply a stimulus to the person for producing a response tending to interrupt the person's snoring. The stimulus device includes a vibrator and a band for enclosing a body part of the person and for applying a vibration to the body part. Also described is a force or displacement sensor, which includes a housing filled with a liquid having high transmissivity and low attenuation properties with respect to acoustical waves, and an acoustical transmitter and an acoustical receiver carried by opposed walls of the housing spaced from each other to define between them an acoustical transmission channel of the liquid. The housing is deformable by a force such as to change the length of the acoustical transmission channel in accordance with the applied force. A measuring system measures the transit time of an acoustical wave through the acoustical transmission channel to provide a measurement of the applied force.

The invention belongs to the field of measuring instruments, in particular to a large mechanical force measuring machine. The novel mechanical force measuring machine mainly consists of a machine body, a frame, a weighing sensor set, a power mechanism, a pressurizing mechanism, a compression displacement multiplication mechanism and an operating instrument, wherein the power mechanism is composed of a stepper motor and a cycloidal-pin wheel decelerator and fixed above a base of the machine body; the pressurizing mechanism is composed of a pressurizing screw rod and a screw nut, and a forced direction of the pressurizing mechanism is changed by a force transmission lever; for bringing convenience to calibration work of the force measuring machine, an integrated package-type frame is composed of a frame with four upright posts and the compression displacement multiplication mechanism on a surface of a bearing table; and the displacement of the frame is increased by ten times in comparison with the deformation of a sensor per se by compressing a disc spring in the compression displacement multiplication mechanism to shrink under pressure. In an embodiment of the invention, a measurement precision value can easily reach 1/640,000.

The invention discloses a striking-force test fixture for keyboard lines, which is characterized in that an original electromagnetic valve tester is additionally provided with a baffle, and a power supply and an electromagnetic valve are replaced; when the striking-force test fixture for keyboard lines is used, through setting weights, a key point of a keyboard line is subjected to a striking-force lower limit test, then through energizing the electromagnetic valve, an electromagnetic force is produced for carrying out a striking-force upper limit test on the key point of the keyboard line, so that the weights of different weights and the energized voltage can be set and the length of a thick stem part of a spool stem in the electromagnetic valve can be adjusted according to different upper/lower limit requirements of a test point to be tested, thereby meeting the striking-force upper/lower limit test requirements of different test points; the declining height of a test fixture board is controlled through setting the baffle, so that the thin stem part of the spool stem on the electromagnetic valve is accurately positioned to a key point of a keyboard line to be tested; through enlarging the diameter of the thin stem part of the spool stem on the electromagnetic valve and directly pressing the spool stem against a product to be tested so as to directly carry out a striking-force test on the key point of the keyboard line, the bending or deformation of the thin stem part is avoided, and the abrasion caused by the application of a tapered test rubber head and the position change of a measuring center are avoided, thereby improving the measuring precision.

Load-measuring transducers utilizing induced-voltage measurement techniques are described. The wiring patterns of such transducers can be configured with a plurality of moveable gauge portions to reduce errors encountered with eccentricities between the transducer gauges, and are preferably configured to reduce interference errors due to wiring patterns thereof.