RU1800170C - Pivotal fore-links mechanism - Google Patents

Abstract

The invention relates to balancing mechanisms. The purpose of the invention is to improve the quality of the balances. The hinged four-link consists of crank 1, connecting rod 2, rocker 3, strut 4. Crank 1, connecting rod 2, rocker 3 are interconnected by hinges 5 and 6. Crank 1 and rocker 2 are hinged to the strut at points 7, 8 For balancing, a balancing device is inserted into the four-linker. the balancing mechanism is formed by a first rod 9 connected to the middle of the rocker 3 by a hinge 13, a slider 11 with a guide 17, fixed to the first rod 9 by a hinge 14, a rod 12, perpendicular to the guide of the slider 17 and pivotally connected to the rod 12 by the second rod 10, another its end pivotally connected to the connecting rod 2. The extension line of the guide 17 passes through the hinge 8, the distance between the hinges 8 and 13 is equal to the length of the first rod 9, the distance between the hinges 15 and 6 is equal to the length of the second rod 10. 1 il. WITH/)

Description

The invention relates to balancing mechanisms and can be used to eliminate vibrations transmitted to the foundation of a machine assembly from a four-link articulated mechanism.

The aim of the invention is to improve the quality of the balancing.

To achieve the goal in a four-link articulated shaft containing a crank, a connecting rod, a beam, a strut and a balancing mechanism, the balancing mechanism is formed by a first shaft pivotally connected to the center of the beam, a slider with a guide pivotally mounted on the first shaft, a rod, a perpendicular , and the second rod pivotally connected to the rod, its other end pivotally connected to the connecting rod, the extension line of the guide slide passes through the hinge of the rocker arm, the distance between the hinges the rocker arm and the rocker-first rod are equal to the length of the first rod, the distance between the hinges of the second rod-connecting rod and the connecting rod-rocker is equal to the length of the second rod, and the parameters of the mechanism are determined by the dependencies

And - hSyi 0; Sx2 + dslna (m3 + m5) 0; 3x1 0;

Xx 0; Sx4 0; Sx5 0; SX6 0; Sx 0;

3Y2 - l2 (mi + Syil. 1) - (la - dcosa) (t + + m5) 0; .(1)

SV3 + ls (mi + Syil 1) + 1s (1 / 2t + ts + + 1 / 2gp4 + ms) 0;

3У4 + 1 / 21зт4 0; Sys + Urns 0; Sye 0; Sy 0;

l2 - (l22 - d2) (m3 + ms) - l22 (mi + Syif1i) l5 - Г41П5 0;

s + I23 (mi + Syil 1i + 12s (1 / 4t2 + tz + + 1 / 4m4 + m5) - M- 1 / 4Gzgp4 0;. where And, la, 1s, 14 are the length of the crank, connecting rod, rocker, the second rod respectively;

3x1, 5x2, 5x3, 3x4, 3x5, Zhb, 8x7 - the static moments of the masses of the crank, connecting rod, rocker arm, the first and second rods, slide and rod relative to the longitudinal axes of these links, respectively;

3U1, 3U2, 5uz, 3U4. 3U5, 3U6, 3U7 are the static moments of the masses of the crank, connecting rod, rocker arm, first and second rods, slide and rod relative to the transverse axes of these links, respectively;

Ji. J2, Js, Js. Je, J - moments of inertia of the mass of the crank, connecting rod of the rocker arm, the first and second rods relative to the points

intersections of the longitudinal and transverse axes of these links, respectively;

gtr, ta, tk, gp4, ms are the masses of the connecting rod, first and second rods, slide and rod, respectively;

d is the distance between the hinges of the crank - connecting rod and connecting rod - the second rod; O. is the angle between the straight line passing through the centers of the hinges of the crank - connecting rod, the connecting rod - the rocker arm, and the straight line passing through the centers of the hinges of the crank - connecting rod and the connecting rod - the second rod.

The drawing shows a diagram of the articulated four-link with the proposed balancing device.

The hinged four-link consists of crank 1, connecting rod 2, rocker 3, strut 4. Crank 1, connecting rod 2, rocker 3 are interconnected by hinges 5 and 6. Crank 1 and rocker 2 are hinged to the rack at points 7, 8.

For balancing, a balancing device is introduced into the four-link, the balancing mechanism is formed by a first rod 9 connected to the middle of the rocker 3 by a hinge 13, a slider 11 with a guide 17, fixed to the first rod 9 by a hinge 14, a rod 12, perpendicular to the guiding slider, and connected to the rod 12 by a second rod 10, its other end pivotally connected to the connecting rod 2, the extension line of the guide 17 passes through the hinge 8, the distance between the hinges 8 and 13 is equal to the length of the first rod 9, the distance is dy hinges 15 and b is the length of the second rod 10 and the mechanism parameters determined depending E

h is liSyi 0; 3x2 + dsln o (tk + ms) 0; 3x1 0;

Xx 0; 3x4 0; SX5 0; SX6 0; SX7 0; 3Y2 - a (nii + Syi.r1i) - (la - dcosa) (t + + ms) 0;

Zuz + 1z (t1 + Syil 1i) + 1z (1 / 2t2 + tz + + 1 / 2gp4 + t5) 0;

3У4 + 1 / 21зт4 0; 3U5 + Ums 0; Sye 0; 3U7 0;

l2 - (l22 - dz) (m3 + m5) - l22 (mi + Syif1) -l5 - I 4ГП5 0;

| 3 + | 23 (mi + Syif10 + 12s (1 / 4gp2 + tz + + 1 / 4yg14 + ms) - C - 1/41 sgp4 0; where H, 1a, 1z, U-length of crank 1, connecting rod 2, rocker arm 3, the second rods 10, respectively;

5x1. 3x2, 3x3, 3x4, 3x5. 3X6, 3x7 — static moments of masses of crank 1, connecting rod 2, rocker 3, first .9 and second 10 rods, slide 11 and rod 12 relative to the longitudinal axes of these links;

Syi, Sy2, Sy3. Sy4, Sys, Sy6. Sy — static moments of masses of crank 1, connecting rod 2, rocker 3, first 9 and second 10 rods, slide 11 and rod 12 relative to the transverse axes of these links; .

Ji, J2, Ja, Js, J6. J are the moments of inertia of the masses of crank 1, connecting rod 2, rocker 3, first 9 and second 10 rods relative to the intersection points of the longitudinal and transverse axes of these links;

mi, gp2, gpz, gp4, ms - the mass of the connecting rod 2, the first 9 and second 10 rods, slider 11 and rod 12;

d is the distance between the hinges 5 and 15; -

and. - the angle between the straight line passing through the centers of the hinges 5 and 6, and the straight line passing through the centers of the hinges 5, 15.

The crank 1 is driven by a motor located on a rack 4 common with the mechanism (the motor is not shown in the diagram). The movement through the connecting rod 2 is transmitted to the beam 3, performing a rotational movement around the hinge 8.

Through a pivot connection 13, movement from the beam 3 is transmitted to the first shaft 9, the other end of which slides along the strut A along the guide 17 together with the slider 11. The equal length of the balancing eras adopted in the application; reap 9 and the distance between the hinges 8, 13 allows us to provide the following kinematic dependence between the angular accelerations of the links

$ s # &,. where 2, rz are the angular accelerations of the beam 3 and the first balancing rod 9, respectively.

Through a pivot connection 15, movement from the connecting rod 2 is transmitted to a second balancing rod 10, the other end of which is pivotally connected to the rod 12. The arrangement of the hinge 13 adopted in the application is equal to the distance between the hinges 8, 13 and the length of the first balancing rod 9 and also the perpendicularity of the rod of the guide slide provide the following property of the balancing device: the extension line of the rod passes through the hinge 6. This property, as well as the equality of the length of the second balancing rod, is also accepted in the application. 10, the distance between the hinges 15 and 16 allows us to ensure the following kinematic dependence between the angular accelerations

R/ -

where 1, the angular accelerations of the connecting rod 2 and the second rod 10, respectively

The presence of such dependences between the angular accelerations of the links and the mass ratios, moments of inertia, and lengths described by the system of equations (1) will ensure that the main vector and the main moment of inertia forces are equal to zero. Consequently, vibration from the articulated four-link mechanism will not be transmitted to the machine assembly strut.

Claims (1)

The claims An articulated four link containing a crank, a connecting rod, a rocker arm, a strut and a balancing mechanism, so that, in order to improve the quality of balancing, the balancing mechanism is formed by the first shaft, pivotally connected to the middle of the rocker arm, the slider with the direction a rod pivotally attached to the first shaft, a rod perpendicular to the guide of the slider, and pivotally connected to the rod by a second rod, its other end pivotally connected to the connecting rod, the extension line of the guide slide passes through rocker arm hinge - strut, distance between rocker hinge hinges -. strut and rocker - the first rod is equal to the length of the first rod, the distance between the hinges of the second rod - connecting rod and connecting rod - rocker is equal to the length of the second rod, and the parameters of the mechanism are determined by the dependencies . ti is hSyi 0; Sx2 + dsin "(m3 + ms) 0; SX1 0; Sx3 0; SX4 0; Sx s 0; Sxf 0; Sx 0; Sy2 - l2 (mi + Syl 1i) - (12 - dcos a) (t + + ms) 0; 5uz + l3 (mi + SyiT1i) + 1z (1/2 gp2 + tz + + 1 / 2rri4 + GP5) 0;  s t4 0; 5U5 + Urns 0; 5ub 0; Sy7 0 ;. b - (I22 - сГХтз + ms) - l22 (mi + Syil 1i) - -l5-nim5 0; s + I23 (mi + Syi I 1i) + 12z (1 / 4t2 + tz + + 1 / 4gl4 + ms) -UI23 / 4ggm. 0; where h, l2, s, C are the lengths of the crank, connecting rod, rocker arm, and the second balancing rod, respectively; 5x1. 5x2, 5x3, 5x4, 5x5, 5x6, 5x7 - static moments, masses respectively of the crank, connecting rod, rocker arm, first and. the second rods, slider and rod relative to the longitudinal axes of these links; Syi, Sy2, 5uz, 5u4, 5u5. 5U6, 5U7 — static moments of masses of the crank, connecting rod, rocker arm, first and second rods of the slide and rod, respectively, with respect to the transverse axes of these links; li, 12. 1h, 14. Is — moments of mass inertia; d — distance between the joints of the crank, crank, connecting rod, box-crank — connecting rod and connecting rod — second rod; thought, the first and second rods relate-a-angle between the straight line passing at the intersection points of the longitudinal ones through the centers of the hinges of the crank - connecting rod, transverse axes of these links; 5 connecting rod - rocker, and straight, passing mi, gp2, tk, ggm, ms- masses respectively through the centers of the hinges crank - connecting rod but the connecting rod, the first and second rods, half and the connecting rod - the second rod, zuna and rod; .