35results about How to "Small measuring force" patented technology

The invention discloses a bearing ring optical density air gauge which comprises an electric translator (11), an electric display (12) and a air measurer(2) which adopts a column structure and is arranged on a measuring device; it inlets the condensed air through the grouter(8) of the air measurer(2) into the inner bearing ring (1)optical density, the air measurer(2) can use the electric translator (11) to change and use the electric display (12) to display the measuring value by the change of the length value of the draft force.

The invention discloses a pneumatic device for measuring internal diameter and external diameter of a thin-wall bearing ring. A thin-wall bearing ring easily deforms and generates test marks on the surface due to measurement by a traditional mechanical measurement instrument. The device provided by the invention comprises a conveying belt, a stepper motor, a central fixture, an external diameter measuring head, an internal diameter measuring head, a measuring driving device and a central cylinder. The stepping motor drives the conveying belt; the external diameter measuring head and the internal diameter measuring head both include an upper measuring head and a lower measuring head; an upper airway of the upper measuring head is communicated with plurality of lower airways of the lower measuring head; a side wall of each back pressure sensor connection hole is connected with the is communicated with one lower airway; each back pressure sensor connection hole is provided with the hole a pressure sensor; each back pressure sensor connection hole of the external diameter measuring head is provided with a measuring nozzle; and the outer end of each back pressure sensor connection hole of the internal diameter measuring head is provided with a measuring nozzle. The invention adopts pneumatic measurement mode for measuring the internal diameter and external diameter of thin-wall bearing ring, and the surface of the measured part will not be scratched and can keep the geometrical shape.

The invention relates to a variable-stiffness contact micro-nano coordinate measuring machine probe which is characterized in that the variable-stiffness contact micro-nano coordinate measuring machine probe comprises elastic sensitive beams, a central connector, a crane-shaped frame, an H-shaped flexible mechanism, a capacitor upper pole plate, a capacitor lower pole plate and a worktable; the inner end of the elastic sensitive beam is fixed to the head part of the crane-shaped frame; the outer end of the elastic sensitive beam is fixed to the inner end of the midpoint of the H-shaped flexible mechanism; the end of the central connector is fixed to the midpoint of the elastic sensitive beam; two sides of the H-shaped flexible mechanism are fixed to the crane-shaped frame; the capacitor upper pole plate is fixed to the lower surface of the end of the central connector; and the capacitor lower pole plate is fixed to the upper end of the worktable. According to the variable-stiffness contact micro-nano coordinate measuring machine probe, through arranging a probe suspension mechanism, probe system stiffness adjustment and compact spatial arrangement structure are realized; through arranging a piezoelectric driver and the elastic sensitive beam, a measuring force in a measuring process is reduced; through arranging the elastic sensitive beams which are uniformly distributed aroundthe axis of the workpiece and the crane-shaped frame, a requirement for mounting symmetry and consistent pressure of the elastic sensitive beam is reduced; and furthermore the variable-stiffness contact micro-nano coordinate measuring machine probe has advantages of simple structure, convenient operation, high economic performance and high practicability.

The invention belongs to the technical field of detection devices, and discloses an automatic detection device for an M-value of a worm and the runout of a tooth surface. The automatic detection device comprises a workbench, wherein the workbench is provided with a clamping unit used for clamping the worm and a measuring unit used for measuring the M-value of the worm and the runout of the tooth surface, the measuring unit comprises a contact portion, a measurement portion, a moving base and a measurement control portion, the contact portion is connected with the measurement portion, the measurement portion is arranged on the moving base, the measurement control portion is connected with the moving base, and the measurement control portion can control the measurement portion and the contact portion to move along a direction parallel to a clamping axis of the worm and a radial direction of the worm so as to enable the contact portion to be contacted with the tooth surface of the worm toperform measurement. The automatic detection device abandons a method of manually detecting the M-value, and improves the detection accuracy through refined component setting. Meanwhile, the automatic detection device is mechanically operated in the whole process, can realize full detection for the M-value of the worm, avoids the risk of manual wrong detection and missed detection and improves the detection efficiency at the same time.

The invention discloses a method for high-precision measurement of the sphericity of the micro-spherical probe of a nanometer three-coordinate measuring machine. A tungsten probe with large length-to-diameter ratio and a quartz tuning fork are combined. Scanning probe heads with nanometer-level resolution are constructed based on a precision micro stage. During measurement, the two scanning probe heads are driven by the micro stage to scan the large-section contour of a microsphere in the x-axis direction in a differential manner. Radial error generated in the scanning process can be automatically eliminated in a differential manner, and thus, accurate parameters of the large-section contour of the microsphere can be obtained. After the microsphere is rotated a certain angle, the measurement is repeated to acquire multiple sets of parameters of the large-section contour. A three-dimensional spatial contour of the microsphere is constructed through fitting according to feature points obtained. The geometric parameters of the microsphere are calculated based on the three-dimensional spatial contour. Thus, high-precision measurement of the sphericity of the microsphere is realized. The method has the characteristics of small measuring force, wide measuring range, and high measuring precision.

The invention relates to a PVDF-based tapping-mode high-sensitivity SPM measuring head and a measuring method thereof. The PVDF-based tapping-mode high-sensitivity SPM measuring head is characterized in that a PVDF piezoelectric membrane is taken as a vibrating beam and a tungsten probe is taken as scanning probe; the vibrating beam is set to be a simply supported beam with bended radian; the left end and the right end of the vibrating beam are fixed on front ends of oppositely arranged piezoelectric drivers on both sides through clamping structures respectively; rear ends of the piezoelectric drivers on both sides are fixed on respective cantilever beams respectively; one end of each of the cantilever beams is suspended on a measuring head holder; and the scanning probe is fixed on a center position on the lower surface of the vibrating beam. The measuring method takes the variation of electric charges outputted by the vibrating beam to represent the amplitude variation of the vibrating beam caused by a micrometering force, and performs multipoint micrometering force tapping scanning on a surface to be measured to realize measurement of the surface of a sample. The PVDF-based tapping-mode high-sensitivity SPM measuring head and the measuring method can realize high spatial resolution and low measuring force, are suitable for various materials, and can measure under air environment.

The invention provides a vertical variable shear force type direct shear creepmeter which comprises an instrument table, a shear box, a dial indicator and a pressurization system; the shear box is composed of a first box body and a second box body, and the second box body slides downwards relative to the first box body under the action of gravity and a second weight set; the pressurizing system comprises a horizontal axial pressure weight system and a vertical shearing force weight system; the horizontal axial pressure weight system comprises a first weight group; the vertical shearing force weight system comprises a second weight set, the second weight set is placed in a weight container, the weight container is placed in a liquid container, and the bottom of the liquid container is communicated with a plurality of stress control containers in series through pipelines. Cut-off and communication mechanisms are arranged between the adjacent stress control containers and between the liquid container and the stress control containers. According to the invention, the loss of a force value of a traditional direct shear apparatus for converting vertical gravity into horizontal shear force can be avoided, and the shear stress of a soil sample in the shearing process can be controlled to be constant.