SU1536283A1 - Device for measuring inside dimensions - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the measurement accuracy and enhance the functionality by controlling the deviation of the shape of the longitudinal section profile and the deviation of the axis from straightness. To do this, a control object 19 is placed on the turntable 18, into the hole of which a resonator (P) 3 is inserted. The position of P 3 relative to the horizontal and vertical axes is monitored using sensors 11 and 15. As P 3 moves vertically inside object 19 the change in resonant power is determined by the diameters in controlled sections. The vertical coordinate of the measured diameter is determined by means of a sensor 15. In measuring unit 2, the dependence of the diameter of the controlled cross section on the depth of movement P 3 and the deviation from the linearity of the axis is recorded. The non-circularity of the hole being measured is determined by rotating the object 19 about a given axis on the table 18. The angle of rotation of the object 19 is detected by the sensor 20. 1 sludge.

Description

The invention relates to measuring technique n can be used for non-contact measurement of deep holes, as well as to control the deviation of the profile profile of the longitudinal settlement, deviations from the straightness of the axis in space.

The purpose of the invention is improving the accuracy of measurements and expanding functionality by controlling the deviation of the shape of the profile of the longitudinal section and the deviation of the axis from straightness.

The drawing shows a structural kinematic diagram of a device for measuring internal dimensions, '

The device for measuring internal dimensions contains an excitation unit 1, a measuring unit 2, a measuring cavity 3 in the form of a hollow cylinder, in which the elements 4 and 5 for exciting and measuring vibrations are placed. Round holes 6 are made on the side surface of the measuring cavity 3, the resonator 3 is suspended on a rod 7, on which regulating weights 8 of vertical balancing are mounted. The rod 7 through a gimbal suspension 9 is mounted on a pivotally floating support 10, on which there are displacement sensors i1 along the bracket 12. The support 10 is pivotally mounted on the bracket 12, on which the radial displacement sensor 13 is mounted.

The bracket 12 is pivotally mounted on a vertical strut 14, on which the vertical movement sensors 15 and the bracket rotation sensor 16 are mounted. The vertical strut 14 is rigidly fixed to a height-adjustable base 17. on which a rotary support table 18 is mounted to house the control object 19 and a rotation angle sensor 20. On the adjustable base 17 is located the sensor 21 of the level of the base 17 "Moreover, the measuring unit 2 includes a polyindicator., Polyregister.

A device for measuring internal dimensions works as follows.

The control object 19 is installed on a rotary support table 18 "The resonator 3 is inserted into the controlled hole of the object 19, in which it is self-mounted using regulating weights 8, cardan under weight 9 and articulated floating support 10. The position of the resonator 3 relative to the horizontal and vertical axis is controlled using sensors 11 and 15. On the polyindicator and polyregister of the measuring unit 2 set to zero. On the excitation element 4 from the excitation unit 1, acoustic vibrations are received, which are perceived by the pick-up element 5 and change the readings of the devices of the unit 2, calibrated in units of the length of the measured object. As the resonator 3 moves vertically inside the control object 19, the diameters in the controlled sections are measured by changing the resonant power. The vertical coordinate of the measured diameter is determined using the sensor 15.

The maximum sensitivity of the resonator 3 to external influences will be at the location of the holes 6 at the locations of the antinode. Waves, The diameter of the holes 6 is chosen equal to the value of the specified resolution of the device.

With the vertical movement of the resonator 3 inside the object 19, the dependence of the diameter of the monitored section on the depth of movement of the resonator 3 and the deviation from the straightness of the axis are recorded on the polyindicator of block 2.

The non-circularity of the measured hole is determined by rotating the control object 19 relative to a given axis on the rotary support table 18. The rotation angle of the control object is detected by the rotation sensor 20. In this case, the inertia of the regulating loads 18 of the vertical balancing significantly exceeds the friction force of the resonator 3 against the walls of the measured hole at the moment of contact.

To control an object having several controlled holes, it is possible to use an additional movable table to move the controlled object. If necessary, the bracket 12 with the resonator 3 can be moved along and radially around the vertical strut 14, the implementation of the measuring resonator 3. in the form of an adjustable block of η pairs of diametrically located single resonators with the axes of the mounts located either in one plane or along the axis with an adjustable distance between by itself, allows to expand the limits of measurements.

If necessary, an automatic sorting device with a setter of sizes and matching schemes can be applied.

Claims (1)

Claim A device for measuring internal dimensions, containing a measuring resonator ^ made in the form of a hollow cylinder, in the lateral surface of which holes are made, connected by means of excitation and vibration elements, respectively, to the excitation unit and the measuring unit, characterized in that, in order to increase the accuracy of measurements and expanding functionality by controlling the deviation of the shape of the profile of the longitudinal section and the deviation of the axis from straightness, the excitation block is made in the form of a generator a acoustic vibrations, the holes are made round and a height-adjustable base is introduced on which the inserted vertical strut and the inserted rotary table for placing the test object are rigidly fixed, equipped with a sensor for turning angle bracket mounted on a vertical strut with the possibility of axial rotation and vertical movement relative to vertical rack equipped 15 sensors of radial displacement, rotation and vertical displacement, a rod equipped with regulating weights of vertical balancing, one end of which is attached 20 to the measuring resonator, and the other is freely suspended on an articulated floating support, which is mounted for movement along the bracket and is equipped with a sensor 25 movements.