SU1661398A1 - Rotary hammer work - Google Patents

Abstract

The invention relates to the mining industry and is intended for drilling holes. The purpose of the invention is to increase the reliability of the mechanism while improving the manufacturability of its manufacture. The mechanism includes a housing 1 and a rod 2 located therein with a pin 3 mounted perpendicular to its axis. Pin 3 interacts with longitudinal grooves (PP) 6 made in the back of the face cam 6. Curved surface (CS) of cam 6 has a combined working profile and interacts with roller (P) 7 installed on intermediate link 7. Rod 2 and rear of cam 6, sliders 14 are hingedly connected to the rods 15. Other ends of the rods 15 are hingedly connected to the pushers 16 pressed by the springs 17. The rotation of the rod 2 is transmitted through the pin 3 by means of the PP 5 to the cam 6, and its gearbox through P 7 is connected to link 8 and performed nnym therein PP protrusion 11 of the driven member 12. Sliders 14, connecting rods 15 and the pushers 16 while still and start to move only in translation of the cam 6 which arises in contact with the cutting tool material or rock. In the final section of the gearbox profile of the cam 6, it is detached from P 7, which eliminates the contact of the gearbox edge of the cam 6 with P 7, i.e. KP cam 6 edge damage is prevented. 1 il.

Description

The invention relates to the mining industry, in particular to devices for drilling holes,

The aim of the invention is to increase the reliability of the mechanism while improving the manufacturability of its manufacture,

The drawing shows the mechanism, a general view.

The shock-rotary mechanism includes a housing 1, a rod 2 located therein with a pin 3 mounted perpendicular to its axis 4, the pin 3 touching with the longitudinal grooves 5 of the face cam 6, whose curvilinear surface has a combined profile and interacts with the roller 7 of the intermediate link 8, the shank 9 of which is placed in the longitudinal hole 10 of the rod 2 and the hole 3 perpendicular to it of the pin 3 of the rod 2 rotatably. Intermediate link 8 is made with a longitudinal groove at its end, in which the protrusion 11 of the driven link 12 is mounted. , pressed by springs 17,

The geometry of the final section of the combined profile of the working surface of the Cam 6 is made in accordance with the formula:

Samax - Slmax L „.

S3 S2max + +

p2max -

+ Spr (Zztah + fo) + Gprr 9 (Do) § 2 tprujg

where Zz - linear coordinate profile of the face cam 6 on its final section, mm;

Simax, S2max - the highest lifting height of the combined profile, respectively, of the first and second sections of the profile, mm;

ipimax, - the angular coordinates of these sections, rad;

Spr - is the coefficient of stiffness of the springs 17, N / mm, reduced to the cam 6;

tpr reduced to cam 6 mass of connecting rods 15, sliders 14 and pushers 16, N / s / mm;

fo - preliminary compression of the springs 17, mm;

9 - acceleration of the earth attraction mm / s;

(CC - angular speed cam, rad / s:

 incrementing the angular coordinates of the cam profile 6 for its final section, rad.

Impact mechanism works

in the following way.

The rotation of the engine through a gear reducer (not shown) or directly connected to the rod 2, its rotation is transmitted through pin 3 by

the longitudinal grooves 5, the cam 6, and its curvilinear surfaces are connected through the roller 7 to the intermediate link 8 and are transmitted by its longitudinal groove to the protrusion 11 of the driven link 12, wherein the sliders

14 and the connecting rods 15, as well as the pushers 16 may be stationary, i.e. there is an idle stroke without converting the rotation of the rod 2 into the reciprocating movement of the cam 6 with impacts on the intermediate

link 8.

When a tool is in contact, rigidly integrated in the follower link 12, with the material or rock being processed, the link speed is 12

decreases and there is a progressive movement of the cam 6 on the roller 7 of the intermediate link 8 and the pin 3 of the rod 2, causing movement of the rods 15 and the pushers 16, compressing the springs 17. On

the final section of the curved surface of the combined profile of the end cam 6 is detached from the roller 7, eliminating the contact of the edge of this surface of the cam 6 with roller 7, When

the movement of the cam 6 in the opposite direction also eliminates its contact with the roller 7 by rotating the cam 6 during the opening of these links, i.e. the edging of the curved surface of the cam 6 is prevented.

The continuation of this movement of the cam 6 under the action of the forces of elastic deformation of the springs 17 ends with a blow of the cam 6 through the intermediate link 8 transmitted by

Slave link 12.

Such movement of the links of the mechanism occurs when slowing or stopping the rotation of the slave link 12 by the forces of resistance of the drilled rock or material being processed and the conical friction clutch formed by the surfaces of the slave link 12 and the housing 1. If these forces are not sufficient to stop the rotation of the slave link 12. tool installed in the slave link 12, with blows on it. When the slave link 12 is completely stopped, the shock mode of operation takes place without rotating the tool. The frequency of impacts and the angular velocity

Slave link 12 can be adjusted by pressing force or feed: with an increase in this force, the frequency of impacts increases and the angular velocity of the driven link 12 decreases.

At the moment of contact of the roller 7 with the end section of the curvilinear surface of the combined profile of cam 6, its acceleration takes place before opening. In this case, the force exerted by the roller 7 exceeds the force of the springs 17 and friction in the hinged joints of the connecting rods 15 and the translational joints of the mechanism. This causes the cam b to detach from the roller 7 at a sufficient angular velocity of the rod 2 and prevents the curvilinear surface of the cam 6 from being destroyed during edge contact with the roller 7.

Claims (1)

Claims Shock-rotary mechanism including body, spring-loaded pushers, a roller, a cam with a combined working profile and a rear part, connecting rods and sliders, an intermediate and a driven link, kinematically connected to each other, characterized in that, in order to increase the reliability of the mechanism while simultaneously improving the manufacturability of its manufacture, the mechanism has a rod with a pin, perpendicular to the axis of the rod, the combined working profile is made at the cam end, and in its rear part there are longitudinal grooves for interacting with the rod pin, while one of the creeps newly located on the rod, and the other is set to cooperate with the rear part of the cam, which is mounted on the rod with the possibility of reciprocating movement along its axis, the roller mounted on the intermediate link.