SU1269989A1 - Percussive machine - Google Patents

Abstract

The invention relates to mechanical engineering, in particular, to percussion machines, in particular to the means of vibration protection of percussive impact manual machines, and can be used in mining, construction, road construction, shipbuilding, metallurgy. The purpose of the invention is to reduce vibration by stabilizing the reaction of recoil in magnitude and direction. The shock action is equipped with a sleeve 9, and an end 8 is made at the end of the rod 3. At the same time, the sleeve 9 is spring-loaded relative to the housing 1, the stop 8 and the handle 4 by three elastic elements 5,6 and 7. And the stiffness of the elastic elements 5 and 6 and the strength of the preliminary FO are determined from the following relationships: Ci / C2 Mi / M2, where Ci is the stiffness of the elastic element 5 installed between sleeve 9 and body I; C2 is the stiffness of the elastic element 6 installed between the sleeve 9 and the stop 8; Mi is body mass 1; Ma is the mass of the striker 2 with the rod 3, and from “9 FO FnC2 / (Ci + C2), where F is the passport force pressed. 2 h. pfl, 3 ill. (L with

Description

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The invention relates to mechanical engineering, in particular, to percussion machines, in particular to the means of vibroprotection of hand percussion machines, and can be used in mining, construction, road construction, shipbuilding, metallurgy.

The purpose of the invention is to reduce the Eshbration by stabilizing the recoil reaction in size and direction, as well as reducing the longitudinal dimensions of the machine due to the constructive design of the sleeve.

FIG. 1 shows a percussion machine, the initial position (the beginning of the acceleration of the striker); in fig. 2 - the same, intermediate position (acceleration of the striker); in fig. 3 shows an embodiment of a percussion machine.

The percussion machine includes a housing 1 with a hole in the end, a striker 2 with a rod 3 passing through the hole, a handle 4 and elastic elements 5, 6 and 7, an end 8 is made at the end of the rod 3, a sleeve 9 mounted on the part of the rod 3 between the body 1 and the stop 8 and spring-loaded with respect to the stop 8, the body 1 and the handle 4 by three elastic elements 5, 6 and 7. The elastic element 5 mounted between the sleeve 9 and the body 1 and the elastic element 6 installed between the sleeve 9 and the stop 8, made in the form of compression springs. In addition, the sleeve 9 (fig. 3) is made in the form of a glass 10 with a flange II, a ring 12 fixed on the inner surface of the handle 4 prevents the removal of the handle 4 from the housing 1, since the inner diameter of the ring 12 is smaller than the outer diameter of the sleeve 9.

The machine works as follows.

If the sleeve 9 is stationary relative to the handle 4 under the action of forces applied from the side of the elastic elements 5, 6 and 7 arising during the operation of the percussion machine, then the vibration is practically absent, and the recoil reaction is equal to the amount of pressing force that the operator applies to the handle 4 when the machine is running.

Such an equilibrium of forces is achieved by choosing the stiffness of the elastic elements 5 and 6, respectively, proportional to the masses of the body 1 of the machine and the striker 2 with the rod 3 from the ratio

Cr Mg

where c | - the stiffness of the elastic element installed between the sleeve and the housing;

Sz-stiffness of the elastic element installed between the sleeve and the norm;

MI body mass; Mg is the mass of the striker with the rod.

In order to choose the optimal preload force of the elastic elements 5 and 6, at which the vibration protection of the handle 4 is maintained, and the efficiency reduction due to compression of the elastic elements is minimal at the time of the working stroke, is determined with the maximum stem extended from the ratio FO F Cj / Ci -j- С2, where FM is the passport for pressing.

Claims (3)

1. A percussion machine containing a body with a hole in the end, a firing pin with a rod passing through the hole, a handle and elastic elements, characterized in that, in order to reduce vibration by stabilizing the recoil response in size and direction, at the end of the rod the stop is made, and the machine is equipped with a sleeve mounted on the part of the stem between the body and the stop and spring-loaded relative to the stop, the body and handle with three elastic elements, the rigidity of which is chosen from the ratio where Ci is the stiffness of the elastic element installed between the sleeve and the housing; Sa is the stiffness of the elastic element, mounted between the sleeve and the stop, M | - body mass; M2 is the mass of the striker with the rod. 2. The machine according to claim 1, characterized in that the resilient elements mounted between the sleeve and the housing and the sleeve and the stop, made in the form of compression springs, respectively, with stiffness Ci and Cz, are installed with the maximum extended stem with the preload force Fo, determined from the ratio Cr where PH is the passport of the pressure. 3. Machine on PP. 1 and 2, characterized in that, in order to reduce the longitudinal dimensions of the machine, the sleeve is made in the form of a cup with a flange. 9ig.2