SU69471A1 - Tester for springs, piston rings and the like for elasticity - Google Patents

Description

The proposed device is designed to test springs, piston rings and the like for elasticity. Its distinctive feature is a device for automatically fixing the device in the zero position for any linear dimension of the unloaded test piece.

The device is driven by an electric motor, the rotation of which through a worm gearbox and a belt drive is transmitted to the distribution rollers, with the cams mounted on them controlling the operation of the heads of the device. During one revolution of the cam roller, one spring is tested, the suitability of which is determined by the signal lamps that come on from a special contact device.

FIG. 1 and 2 shows the front and top view of the device; Fig. 3 is a side view of a tensile test head; Fig, 4 - side clamp in section; in fig. 5 - device contact device.

The device is equipped with two heads working independently of one another, mounted on a welded or cast table. One of the holo33 Svod. Release 9,

fiOK is designed to test springs for expansion, another for compression.

The head of the device, designed to test the springs for stretching, works as follows.

The lever / (fig. 3) of the head is balanced in a horizontal position by means of a counterweight 2 and a screw 3. The spring under test is put on the upper holder 4 and the hook 5, after which the gap between the holder, the hook and the spring is selected. For this purpose, the suspension 6 suspended from the beam 7 connected to the lever / using an earring lays a weight slightly greater than eight times the weight of the test spring (the ratio of the arms of the lever is 1: 8). After that, the position of the lever / is fixed by means of a preliminary lateral pressing 8 (Fig. 4) and an axial cam 9 (Fig. 3). The side clamp 8 acts from the force of the spring 10 transmitted through the lever P and the eccentric 12. The clamp 8 is released from the action of the cam 13 (FIG. 2) of the camshaft M on the strut, collar 15 and the angle fork 16.

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The cam 9 locks the lever / under the action of a spring twisting, placed on the cam axis 17 and fixed at one end with one end in the head wall, and with the other end in axis 17.

The cam 9 is retracted by the action of cam 18 (fig. 2) of camshaft 14, pillar 19 (fig. 3), xOiMyTHKa 20, gear, sector 21, and gear located on axis 77.

To mitigate the operation of the device, a counterweight is designed, in the form of a load 23 suspended at the end of the lever 22, slightly exceeding the basic load of the suspension 24 (FIG. 3).

When the spring is stretched with a given load, the cam 25 of the camshaft 14 bends, with its bevel, the roller 26 of the lever 27 fixed with a key on the axis 28. The yoke 22 thus moves away from the end of the rod 29, on which the lower hook 5 is fixed cargo.

The device is equipped with a device that signals the validity of the tested springs and consists of two colored light bulbs and a contact device. Power signaling device from the network of the electric motor through a step-down transformer.

The contact device is made in the form of a contact ring and two micrometric screws 30 (Fig. 5), having a hole into which the contact rod 31 enters, isolated from the screw with ebonite sleeves 32. The rod 31 is brought to the extreme upper (zero) position using a weak spring 33 .

Contact ring 34 is attached to rod 29 with screws 55 and is isolated from it by a mica gasket and ebonite bushings 36.

One end of the wire coming from the signal lights is connected to the screw 35, and the other to the screw 37 (; Fig. 5) of the contact rod. Consequently, when the contact rod and the contact ring are touched, the indicator lights come on.

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The determination of the suitability of the spring is carried out as follows.

Suppose that the spring being tested should stretch at a given load, for example, 50 kg, by 8 .mzh + 5%, i.e. within 7.6 and 8.4 mm. According to these values, the micrometric screws are set, the device is actuated, and the spring is extended.

If the spring is rigid and expands by less than 7.6 mm, then the contact ring 34 will not touch any contact rod 31 and the light will not come on. Consequently, the spring is unusable. If the spring is extended above 7.6 mm, but less than 8.4 mm, the slip ring will touch one contact bar and one bulb will light up. This will show that the spring is within tolerance, i.e. suitable.

In the event that the spring is extended above 8.4 mm, the contact ring will touch the second contact roller, as a result of which the second light bulb will light up. This, in its turn, will indicate that there are two of it, that is, it is out of tolerance, because it is too weak.

The compression spring test head is identical to the described tensile test head, but its action, in relation to the described head, proceeds in reverse order.

Subject invention

1. Instrument for testing springs, piston rings and the like for elasticity with two holders of the ends of the test piece, connected with weights by a lever gear and an eccentric automatic control system, which, in order to automatically fix the instrument in zero position at any linear size of the unloaded test piece, applied eccentric 12, driven in rotation from the camshaft of the device and clamping by means of a spring-loaded clamp 8 holder 4, loaded with a small post nnym counterweight.

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