RU2190186C2 - Device for checking through hole key way for symmetry deviation - Google Patents

Abstract

FIELD: measurement technology. SUBSTANCE: proposed device is designed for measuring deviation of position of key ways relative to axis of through holes. Device has housing 1, alignment pins 2, 3, indication unit 5 installed on slider 4. article 9 to be checked in located in housing 1 by fitting its hole onto alignment pins 2 and 3 providing contact of measuring tip 6 of indication unit 5 with side surface 7 of key way under checking. Measuring tip 6 is made L-shaped. EFFECT: improved accuracy of checking. 2 dwg

Description

Technical field
The invention relates to measuring technique and can be used in mechanical engineering for measuring deviations from the symmetry of the keyway relative to the axis of the through hole.

State of the art
A known device for monitoring keyways, comprising a housing with two support rollers, a rotary disk mounted on the housing, a level mounted on the rotary disk, a bracket mounted pivotally at one end of the housing, a reading device placed on the bracket, and a lever interacting with one the end with a reading device, and the other with a controlled surface [USSR Author's Certificate 859792, IPC G 01 B 5/14, 1981 (analog)].

 However, the known device has low accuracy when measuring deviations from the symmetry of the keyway of the hole due to the uncertainty of the angular position of the part around its longitudinal axis.

 Closest to the claimed is a device for monitoring keyways, comprising a housing made in the form of a prism, a slider mounted on the housing with the ability to move perpendicular to the bisector plane of the prism, and two reference units, of which the first is mounted on the slider and has a measuring tip mounted in a plane parallel to the bisector plane of the prism, and made with a lateral barrel-shaped surface and a flat base surface perpendicular to the axis of the measuring tip, and second oh installed on the housing and has a measuring tip located perpendicular to the bisector plane of the prism and interacting with the slider [Copyright certificate SU 1229558 A1, IPC G 01 B 5/24, 1986 (prototype)].

 However, in this instrument, when reconciling the mutual angular position, the base of the groove under test is used as a base, the position of which is set with low accuracy relative to the surface of the hole, which reduces the accuracy of basing, and therefore the measurement accuracy.

Disclosure of invention
The present invention was based on the task of developing such a device for measuring deviations from the symmetry of the keyway of the through hole, which allows to increase the accuracy of the measurement due to the reliability of basing the measurement object on the device.

 This is achieved by the fact that the device for measuring the deviation from the symmetry of the keyway of the through hole comprises a housing with a base element made in the form of two centering fingers, a slider mounted on the housing with the possibility of translational movement in a plane perpendicular to the longitudinal axes of the centering fingers, and a reference unit, mounted on a slider and having a measuring tip, said tip being made L-shaped.

 Thus, in the proposed device, compared with the prototype, due to the base elements made in the form of centering fingers, the possibility of moving the slider in a plane perpendicular to the longitudinal axes of the said fingers and the L-shaped shape of the measuring tip ensures reconciliation of the mutual angular position of the measurement object and the body using -the rotational movements of the measurement object and the movements of the slider in the direction of the depth of the tested groove (and not on the bottom surface in the prototype), which increases There is a reliable base, and hence the accuracy of measurement.

Brief Description of the Drawings
Figure 1 shows a General view of the device, front view; figure 2 is a section along aa in figure 1.

The best embodiment of the invention
A device for measuring deviations from the symmetry of the keyway of the through hole contains a housing 1 with a base element made in the form of centering fingers 2 and 3, a slider 4 mounted on the housing 1 with the possibility of translational movement in a plane perpendicular to the longitudinal axes XX of the centering fingers 2 and 3, and a reading unit 5 mounted on a slider 4 and having a L-shaped measuring tip 6. The mentioned tip is designed to interact with the lateral surfaces 7 and 8 of the tested groove of the object Erenia 9.

The device operates as follows. On the centering fingers 2 and 3, a measurement object 9 is installed with a hole, providing contact of the measuring tip 6 of the reading unit 5 with the side surface 7 of the test groove. The mutual angular position of the measurement object 9 and the housing 1 is verified by turning the measurement object 9 on the centering fingers 2 and 3 and moving the slide 4 along the housing 1 with the reading unit 5 and the measuring tip 6 in the depth direction of the tested groove. Reconciliation is completed in a position in which the readings of the reference unit 5 are unchanged at the mentioned movements of the slider 4. The first sample Δ _{1 of the} reference unit 5 is removed. Reset the measurement object 9 on the centering fingers 2 and 3 so that the side surface 8 is in the lower position while providing contact of the measuring tip 6 with this surface of the test groove. Reconcile the mutual angular position of the measurement object 9 and the housing 1 in the above sequence, and then take the second sample Δ _{2 of the} reference node 5. Then determine the deviation from the symmetry Δ _symm by the formula: Δ _sym = (Δ ₁ -Δ ₂ ) / 2, where Δ ₁ is the first count, Δ ₂ is the second count.

 Thus, the deviation from the symmetry of the keyway relative to the axis of the through hole is measured.

Industrial applicability
The device can be used at engineering enterprises when measuring deviations from the symmetry of keyways relative to the axis of through holes.

Claims (1)

 A device for measuring the deviation from the symmetry of the keyway of the through hole, comprising a housing with a basing element, a slider mounted on the housing with the possibility of translational movement, and a reading unit mounted on the slider and having a measuring tip, characterized in that the base element is made in the form of two centering fingers, the slider is mounted on the housing with the possibility of translational movement in a plane perpendicular to the longitudinal axes of the centering fingers, and the measuring tilt Nick made L-shaped.

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