SU913021A1 - Device for measuring article diameters - Google Patents

Description

The invention relates to a measuring technique and is applicable for measurement by the method of girdling the diameters of products with a discontinuous surface, for example, the diameter of a tricone ball of cutting tools with an odd number of teeth.

It is known a device comprising a 'rigid ring with radial holes', inside which is placed an elastic tape, a set of balls with a diameter greater than the thickness of the ring walls freely passing into its holes, and freely sliding along the ring, transmitting the measuring force through the balls to the tape and having an internal tapered groove sleeve, the amount of movement which characterizes the desired diameter 's [1].

The disadvantages of the described device are low measurement accuracy, unreliability in operation, the inability to measure the taper of the cylinder. .

The low accuracy of the measurement is determined by the fact that the movements of the tape are not connected with the movements of the indicator needle directly, but through the intermediate parts between them; sleeves and balls.

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The unreliability and lack of accuracy of the device are also associated with tape stiffness, unreliability (instability) of the crimping tape products. Due to the discontinuity of the measured surface, the shape of the tape from the load with the balls is non-circular: the tape is pressed in the free areas more than in the contact areas. In addition, the tape can be deformed even by the force of the hands when the sleeve is swinging. In turn, the unreliability of crimping has a negative effect on the measurement accuracy, since the movements of the tape are associated with the movements of the sleeve and the indicator needle.

Closest to the invention is a device for measuring the diameters of products, containing a holder with a displacement unit, an elastic element fixed at one end in. the holder, and the second interacting with the displacement unit, and the reference unit, mounted on the holder and interacting with the second end of the elastic element. The elastic element is made in the form of a tape with rollers [2].

This device is also characterized by insufficient accuracy and

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the inability to measure the taper, controlled part.

The purpose of the invention is to improve the measurement accuracy and the expansion of the range of monitored parameters.

This goal is achieved by the fact that in the device for measuring the diameters of products, containing a holder with a moving unit, an elastic element fixed at one end in the holder, and the second interacting with the node, moving, and a reading unit mounted on the holder and interacting with the second end of the elastic element , the elastic element is made in the form of a split ring, the inner surface of which is made convex.

The drawing shows the described device, General view. .

The device contains a holder of 1 s _; node movement, made in the form of a screw 2 with a tapered end, an elastic element made in the form of a split 'ring 3 rigidly fixed with one end in the holder 1, and followed by the end of the screw 2 interacting with the tapered end and mounted on the guides 4 of the holder 1.

In the cage 1 there is a reading unit 5 in contact with the stop 6 fixed on the split ring 3. The inner surface 7 of the split ring 3 is made convex.

The device works as follows.

The device is pre-calibrated using a special standard, which is a cylinder with several steps of known diameter and with beveled edges, which simulate the discontinuity of the product surface being measured (for example, three bevels are made for a tricone chisel). The relationship between the measured diameter (deformation split ring) and tangential movement of the movable part of its section relative to the fixed part, fastened to the yoke (between which the reading unit 5 is placed).

Next, screw the screw 2 into the thread of the cage 1 to expand the internal diameter of the ring 3 to the maximum of the measured cylinder bits with a margin. Throw the device on the roller cutters of the bit 8 and set at the desired height using any device (not shown), the holder 1 is placed between the cones.

The screw 2 is unscrewed from the yoke 1, and the ring 3 starts to compress again under the action of elastic forces. The moving part of the ring slides. ³ along the guides 4 clips 1. The tip of the readout node. 5, fixed to the yoke 1, is continuously in contact with the movable part of the section of the cut ring 3 by means of an abutment secured thereto. 6

At the moment of compression of the rear cones of the cutters with a ring 3 at three gage points (installed visually when the device does not fall off the bit), additionally unscrew the screw 2 from the cage 1 until a guaranteed gap is formed between its head and the movable part of the ring cut, after which the readout is taken

20 diameter from the reference site 5.

To measure the diameter variability, the above operations are repeated for the device positions with different height of the bit, relative to the rear cones of the cones.

In connection with the convex inner surface and the rigidity of the split ring, the function of the device is expanded: it is able to measure the diameter of 30 products in different sections of height

(eg measure, taper). Accuracy, as well as reliability increase, due to the increased stiffness of the split: rings.

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Claims (1)

Claim A device for measuring the diameters of products, containing a holder with a displacement unit, an elastic element, -θ fixed at one end in the holder, and the second interacting with the node ; displacements · the reference knot mounted on the cage and interacting with the second end of the elastic element, different 45 in order to increase the measurement accuracy and expand the range of monitored parameters, the elastic element is made in the form of a split ring, the inner surface 50 which is made convex.