SU1695246A1 - Spring of geophone - Google Patents

Abstract

The invention relates to geophysical instrument making and can be used in general instrument making as an elastic guide. The purpose of the invention is to increase the linear portion of the seismic spring. The elastic elements are made in the form of U-shaped double-cantilever plates located along the chords of the landing circle of the outer bearing ring and equidistant from the center of the spring. 2 Il.

Description

The invention relates to geophysical instrumentation and can be used in seismic receivers, as well as in general instrumentation as an elastic guide.

The purpose of the invention is to increase the linear portion of the seismic spring.

Fig 1 shows a seismic receiver spring; in fig. 2 is a section A-A in FIG. 1, showing the shape of the consoles of the elastic element with the relative movement of the locating rings.

U-shaped elastic elements are located between the outer 1 and inner 2 adjusting rings, each of which consists of two cantilevers 3 and 4 connected by a jumper 5. The base 6 of the console 3 is connected to the internal support ring 2, and the base 7 of the console 4 is connected with the outer support ring 1. The inner support ring 2 is set to pre-erase. body unit on the landing circle 8, and the outer support ring 1 - on the landing circle 9.

If a force P is applied to one support ring, then it moves relative to the other support ring located on the plane for a distance equal to x, and the arms G and 4 of each elastic element are bent as shown in FIG. 2. At the same time, the jumper 5 of each elastic element will move in the same direction by a distance equal to x / 2. Each elastic element will perceive an effort equal to P / 2n (where n is the number of pairs of elastic elements). The consoles in the elastic element are connected in series and therefore each console will be loaded with the force perceived by the elastic element, i.e. the same force equal to P / 2n.

Deflection of an elastic cantilever f. laden with concentrated force Q, defined by the formula

(L

WITH

oh oh

ate to

N o

f

4QL3 Ebh3

where L, b, h beams;

- length, width and height of the elastic

E is the modulus of elasticity of the beam material.

The console of the elastic element consists of two connected in series elastic cantilever beams. The length of such a beam is equal to half the length of the console of the elastic element. The deflection of the console will be determined by the formula

I h3

JP

2 n

() E b h

where I, b - the length and width of the consoles 3 and 4;

h- spring thickness.

Or, after simplifications, we get that the console's gib is

(2 2 n

Ll.

E bh

The dependence of the spring deflection on the force applied to it is the elastic characteristic of the spring and is determined by the formula

x P

E b h

The dependence of the deflection of the console on the force applied to its end is expressed by the formula

 R

I

E bh

Essentially, the cantilever deflection is determined by a moment of force equal to the product of P g / 2n (where r is the shoulder of the moment of force; in the initial position r is equal to I). The deflection of the console reduces the shoulder strength and thereby reduces the moment of force.

Replacing the length of the bend curve of the cantilever with a broken line made up of three straight line sections at a distance of one third of the cantilever length from embedment, in the first approximation for small displacements, we obtain that the dependence of the moment of force arm will be determined by the formula

g -1 4- U (21 g - (2 - + AND 3 2

 (3 + 5l

9x 161

ten

15

Since x is significantly less than I. and 1-a is 1 - a / 2 for a and is significantly less than one, we get:

OU2

g - I And - -

 V1 1b | 2)

The change in the shoulder of the moment of force or the deviation from the linear dependence of the elastic characteristic of the spring will be determined by the formula

L - G L1

3 x2 TBJ2

five

0

five

Q

50

The deviation of the elastic characteristic from the linear dependence of the spring for a given displacement will be the smaller, the greater will be the length I of the console of the elastic element of the spring.

Thus, the spring will allow to increase the linearity of the elastic characteristic of the spring or, for a given linearity of the elastic characteristic, increase the displacement of one support ring relative to another.

Claims (1)

Invention Formula A seismic receiver spring containing outer and inner support rings, bounded by coaxial landing circles and connected by flat elastic elements made in the form of straight, parallel and equal in length consoles connected by bridges at the ends, and the bases with support rings, differing from the fact that, in order to increase the linear portion of the elastic characteristic of the spring, the elastic elements are made in the form of pairs of U-shaped two-console plates arranged along the chords of the landing circle of the outer support of the ring and equidistant from the center of the spring, the base of U-shaped plates of each pair face each other. eight Thebes. / FIG. 2