UA11928U - Strip machine tool - Google Patents

Abstract

Strip machine tool for cutting of natural stone consists of main drive, crank mechanism, gate saw and housing. Reciprocating motion to the gate saw from the crank mechanism is transmitted through the rocking arm, axis of which is perpendicular with longitudinal axis of machine tool, and additional connecting rod connecting the rocking arm and gate saw. The point of fastening on the rocking arm of the connecting rod of crank mechanism moves on the circle, radius of which is for one and a half time greater than the radius of the crank.

Description

Description of the invention

The useful model refers to the technology of processing stones, decorative concrete and other fragile 2 materials and can be used in construction for sawing stone blocks.

Known designs of machines with a curvilinear trajectory of movement of the saw frame (|1)Y. A typical representative of this group of machines is a machine with a pendulum frame movement. The main elements of the machine are: columns, pendulum suspensions, a sawing frame, which is connected to the flywheels of the main drive and feed of the frame with the help of connecting rods. 70 The significant disadvantages of this design of the machine are the lack of constant contact of the tool with the stone and low cutting speeds.

More perfect is the design of the machine with rectilinear movement of the frame (1, p. 281-2881I.

The machines of this group do not have a suspension. The frame moves in rectilinear guides.

This design of the machine ensures constant contact of the tool with the stone. The reciprocating movement of the frame, as in the previous design, is provided by a crank mechanism.

The main disadvantage of this design is the low cutting speed. The average value of the cutting speed is determined by the formula |2, p.151); h- 2,

BO where n is the number of double moves of the frame per minute;

I - frame stroke length, m.

It follows from the formula that to increase the cutting speed, it is necessary to increase the number of double moves of the frame per minute, or the length of the move.

An increase in the number of strokes leads to a sharp increase in acceleration, and therefore to an increase in inertial forces on the parts of the crank mechanism. -at

An increase in the stroke length of the frame is accompanied by an increase in the amplitude of oscillations of the connecting rod attachment point on the crank.

Both ways of increasing the cutting speed lead to a decrease in the reliability of the machines of existing designs. co

The task of the useful model is to increase the cutting speed and increase the reliability of strip machines. with

The task is solved due to the fact that the reciprocating movement on the saw frame from the crank-and-crank mechanism is transmitted through a rocker arm, the axis of which is perpendicular to the longitudinal axis (22) of the machine and an additional connecting rod that connects the rocker arm and the saw frame, and the attachment point on " - the rocker arm of the connecting rod of the crank mechanism moves in a circle, the radius of which is not less than one and a half times

Z is greater than the radius of the crank, and the radius of the attachment point on the rocker arm of the additional connecting rod is determined by the -- formula:

ИК - ви ' и « where K is the radius of the attachment point of the additional connecting rod on the rocker arm; WITH

Ku - the radius of the point of attachment of the connecting rod of the crank mechanism on the rocker arm; c II - the length of the stroke of the saw frame; z" g - radius of the crank. The proposed design is explained by the figure: 1 - the main drive; 2 - crank;

Z - the connecting rod of the crank mechanism; - 4 - rocker arm; - 5 - additional connecting rod; 6 - saw frame; o 7 - machine body; ka 20 8 - spraying block; d - crank radius; со ІІ - the length of the stroke of the saw frame; d - amplitude of oscillations of the attachment point of the additional connecting rod on the rocker arm;

Ku - the radius of the attachment point on the rocker arm of the connecting rod of the crank mechanism; 99 KE" - the radius of the attachment point on the rocker arm of the additional connecting rod. As is known, the largest normal stresses c in the connecting rod are directly proportional (ZI: sttyah i where I is the length of the connecting rod; vo is the angular velocity.

Therefore, by reducing the length of the first connecting rod by a certain number of times, it is possible to increase the angular speed by the same number of times, and therefore the cutting speed without reducing the strength of the structural elements of the machine.

The amplitude of oscillations of the point of attachment of the second connecting rod on the rocker arm in the vertical plane is determined by the formula: б5 р

А-РИ1-.И-|-- 9 where I is the size of the frame stroke;

K is the radius of the connecting rod attachment point on the rocker arm.

If the stroke of the frame is I-O.4m and the radius of the connecting rod attachment point on the rocker arm is K-1m, the amplitude of oscillation of the connecting rod attachment point on the rocker arm will be equal to: 2 p 9 deШМИ-ы-|--| |-002(m). 21

Thus, the use of the proposed design of the machine leads to a 20-fold decrease in the amplitude of oscillations. Therefore, the second connecting rod will experience only an axial load. As is known, the rod 75 structural elements better resist the axial load than the load perpendicular to the axis.

In addition to increasing the cutting speed by increasing the angular speed (number of strokes), the proposed design allows to increase the cutting speed by increasing the stroke length of the frame. The frame stroke length is determined by:

IS

And- ah

RI

From this dependence, it follows that the length of the frame stroke is directly proportional to the ratio of the radii of the points of attachment of the connecting rods on the rocker arm.

Therefore, the proposed design of the machine allows to increase the cutting speed and reliability of the machine.

Sources. - 1. Quarrying and processing of natural stone: Directory / Pod obsch. ed. A.G. Smirny - M.: Nedra, 1990. - 445b. 2. Yu.I. Sichev, Yu.Ya. Bernyn. Stone sawing. - M.: Stroyizdat, 1989-320p.

Z. Reference book on the resistance of materials / Pisarenko G.S., Yakovlev A.P., Matveev V.V. - 2nd ed.-Kyiv: Society for Scientific Thought, 1988. - 7ЗО0p. with

Claims (1)

The formula of the invention (o) "- Strip machine for cutting natural stone, consisting of a main drive, a crank-and-crank mechanism, a sawing frame and a body, which is distinguished by the fact that - reciprocating movement on the sawing frame from the crank-and-crank mechanism transmitted through a rocker arm, whose axis is perpendicular to the longitudinal axis of the machine, and an additional connecting rod that connects the rocker arm and the saw frame, and the attachment point on the rocker arm of the connecting rod of the crank-crank mechanism moves "in a circle, the radius of which is one and a half times greater than the radius of the crank, and the radius the attachment point on the rocker arm Z c 70 of the additional connecting rod is determined by the formula: in. В, "» at --6Й3- я 2nd where K" is the radius of the attachment point of the additional connecting rod on the rocker arm, Ку is the radius of the attachment point of the connecting rod of the crank-rod mechanism on the rocker arm, td 1- the stroke length of the sawing frame, - g- the radius of the crank arm. se) ime) IR e) 60 b5