SU54354A1 - Bourdon Spring Elasticity Tester - Google Patents

Description

The proposed device is intended to test the elasticity of the Bourdon springs, and it makes it possible to find a relationship between the spring travel of the spring ends and the load applied to them. This is achieved by using pivotal jaws which, with the help of a torque spring, carry out the required loads on the spring. The compression of the torque spring and the movement of the ends of the test spring are indicated by indicators.

In FIG. 1, 2, 3 depict the view of the proposed device in three projections with partial cuts.

The proposed device consists of a fixed bracket J and a rotary relative to it on the prism 2 of the bracket 5, carrying the jaws 4,4, between which the Bourdon spring 12 is placed under test. The lower end of the movable bracket 5 ends with a cylindrical yoke in which the nut 6 is missed for the screw 7, load on the ends of the Bourdon spring through a dynamometric spring 5. The compression of the spring is measured by the indicator L.

On one side, the screw 7 rests on the free end of the spring 5 fixed by the opposite end in the rack 13, and on the other hand ends with a pinion 9 mounted on it, driven by the handle 13 through rotation of the gear 8. Thus, the lower part of the device is dispersed by a spring 5, on one side fastened to a fixed bracket, on the other hand, resting on the end of a screw 7 screwed into the movable part of the device.

The process of measuring the Bourdon spring stroke, depending on the load, is as follows. After installing the levels 15, the preload 14 is balanced by the movable bracket 5 so that its center of gravity, which was initially assumed to be on the axis of rotation, was slightly displaced from this axis horizontally to the right (if you look at the drawing). This displacement creates a constant (with slight deviations of the center of gravity from the horizontal) tension on the spring 5, the purpose of which, as stated above, is to measure the force applied to the end of the Bourdon spring using the indicator 11. It has some initial tension of the spring 5, set the indicator arrow // to zero division. After that, the tested spring Bu1) of don 12 is put on the sponges 4.4.

When calibrating the Bourdon spring in the control section of the workshop, for each type of instrument it is most convenient to proceed from the average Bourdon spring stroke. Then, knowing the average stroke value, the Bourdon spring's suitability for this type of instrument will be indicated by the indications of the indicator C. The indicator 16 will be an indicator of the average stroke.

Having an average stroke of the Bourdon spring equal to x mm, we distribute it into two equal parts so that the end of the Bourdon spring

passed the first distance in - mm

when the upper part of the bracket deviates from the right position of the inclination to the vertical position and the rest of the distance is in mm, if the rocker arms deviate from the vertical position to the left position of the inclination. This action ensures the straightness of the stroke of the end of the Bourdon spring.

This stroke is achieved by turning the knob 13 until the pointer 17 deviates downward from the zero value by the required number of millimeters, equal to half the average stroke of the Bourdon springs for this type of instrument. The use of the pointer 17, generally speaking, is quite sufficient, for a more precise definition, can be replaced by observing the indications of the indicator 11.

Test the Bourdon spring 12 is installed, as indicated above, in the jaws 4.4 so that both its ends touch both the horizontal edges of the jaws and the inclined ones. This is achieved by turning the knob 18, fitted with a lock nut 19. After the Bourdon spring is thus installed, the elastic characteristic is removed. For this purpose, a screw 7 is rotated by means of the handle 13. Screwing into the nut 6, the screw 7 compresses the spring 5. The spring, resisting compression, presses the lower end of the bracket 3 and deflects it to the right. At the same time, its upper end deviates to the left, extending the Bourdon spring. With equal rocker arms, the resistance force to the expansion of the Bourdon spring is equal to the pressure force of the spring 5. Therefore, the amount of compression of the spring 5 indicated by the indicator 11, which comes to the full average stroke of the end of the Bourdon spring, indicated by the indicator 16 determines the load on the Bourdon spring. From the magnitude of this load, one can judge the suitability of the tested Bourdon spring for this type of instrument.

In order to balance the moments of forces of the spring 5 and the Bourdon spring did not affect the moments of friction forces of the gear 9 on the gear 8 of the handle 13, the gear 8 at the time of observation is disengaged by turning the lever 19 eccentrically connected to the arm 20, lowering and raising the axles of the teeth 8 and the handle 13.

The use of a fixed on the fixed base handle 13 with a gear 8 for screwing in the screw 7 is caused by the fact that the direct screwing in of the loading screw would cause instability due to oscillations of the rocker arm itself.

The subject matter of the invention.

Claims (3)

1. A device for testing the elasticity of the Bourdon springs, characterized in that it is made in the form of a fixed bracket / and relative to it on the prism 2 of the bracket 5, between the jaws 4,4 of which is laid the test Bourdon spring 12 in order to study its elastic properties. 2. In the device according to claim 1, use of a dynamometric spring 5 associated with the indicator // and used to carry out the loads on the Bourdon spring under test. 3. In the device according to paragraphs. 1, 2 use of a screw pair (nut 6 and screw 7) serving to actuate a torque spring by rotating the serrations 8, which interact with the shchestries 9, rigidly fixed on the end of the screw 7, which, when screwed into the nut 6, is clamped to the torque spring. GK