SU1689403A1 - A method of dismantling firebrick lining in cylindrical mixer - Google Patents

Description

The invention relates to ferrous metallurgy, more specifically in the disassembly of the lining of a cylindrical tank, mainly mobile mixer. The purpose of the invention is to increase productivity

The invention relates to ferrous metallurgy, more specifically to the mechanization of disassembling the lining of mobile mixers to supply iron to converters, and can be used to mechanize the disassembly of the lining of rotary kilns,

The aim of the invention is to increase labor productivity when disassembling the lining and reducing labor costs.

labor when disassembling the lining of the mixer and reducing labor costs. The proposed method is as follows. The repair machine, which is equipped with a power tool, is placed either in front of the neck of the turned mixer and punches a groove in the lining, or from open ends, punches a groove in the lower position after the neck is installed in the upper position. Drummer working body moves in the longitudinal direction of the mixer across the lining rings with a linear speed of the working body of 1.28-1.9 m / h, and a frequency of 500-1000 beats per minute and the frequency of transverse oscillations along the lining rings c. within the limits of 0.5 -1 s ^-1 , a groove is performed, the width of which refers to the length of the circumference of the lining rings as (1: 40-1: 50), then the mixer is rotated with the help of mechanisms periodically after 0.6-1 h in both hand at a speed of 0.5-2 turns in 1 min and tilt to the horizon by 4-6 ° to remove the destroyed lining. 3 il.

The method of disassembling the refractory lining of a cylindrical capacious mixer, is explained.

Figure 1 shows the device carrying out the method, a general view; figure 2 section aa in figure 1; fig.Z - view B in figure 2.

The method is as follows.

Repair machine 1, equipped with a shock working body 2, is placed either

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in front of the neck 3 of the turned housing of the mixer 4 and punches in the lining 5 groove 6, or from the open ends 7, punching groove 6 in the lower position after setting the neck 3 in the upper position.

The drummer 8 of the working body 2 with a frequency of 500-100 beats per minute sets the movement of the working body in the longitudinal direction of the mixer across the lining rings with a linear speed of 1.28-1.9 m / h and the magnitude of the transverse oscillations along the lining rings within 0.5- 1 in 1 s.

The accepted frequency of impacts provides such a loading of the material, in which the energy, which is destined for destruction, cyclically accumulates inside the material, creating a steady increase in stresses, which ultimately reach destructive magnitudes.

The speed V of movement of the machine 1 is determined from the expression

where V is the frequency of impact of the working body. 5001000 beats / min;

Co - instant adhesion of the destroyed lining, equal to 500-700 kg / cm ² ;

b - module of a single implementation of the working body in the lining per blow, equal to 4-7 cm;

Θ is the angle between the force impulse vector and the working body velocity vector, 10.090 °;

a - the taper angle of the working tool 50-55 °;

p is the angle of friction of steel on the lining, 0.30,4 rad;

Ro is the specific resistance of the lining to compression equal to 350-450 kg / cm ² ;

μ - 0.3-0.4 glad - an indicator of the degree of deformation of the lining.

When moving the working body 2 in the upper part of the lining ring of the mixer 4 perform a groove, the width of which refers to the length of the circumference of the lining rings as (1:40) - (1:50). This width of the groove provides spontaneous collapse of the lining. Then, using the mechanisms of the stand 9, the housing is turned periodically after 0.6–1 h in both directions at a speed of 0.5–2 turns per minute, while the mixer is tilted to the horizon by 4–6 °. During the turn and tilt of the mixer, the lining of the rings collapses and is removed from the mixer.

To create a groove 6 with a width of 130-150 mm, equal to the thickness of two refractory mortar and refractory bricks next to each other with a gap (65 mm each),

drummer 8 of the working body 23 performs transverse oscillations in the range of 0.5-1 s ~ ¹ to ensure a given performance according to the technical characteristics of the mechanism of rotation of the boom of the machine around the longitudinal axis.

The ratio of the groove width to the circumference of the lining ring is caused by different diameters of the rings along the length of the mixer (the diameter of small cylinders is 2000 mm on average for a worn lining, and 2500 mm for a large cylinder) and is (1:40) - (1:50). With this width of the groove and the proposed ratio, the radial stresses in the lining rings tend to be minimized, and when the mixer body is rotated in the range of 0.5–2 rpm, the magnitude of the centrifugal forces changes, resulting in the flaking of the lining rings between them. Moreover, the collapse occurs in separate sections along the length of the lining after 0.6-1 h longitudinal movement of the power working body. At the same time, the mixer body is tilted by an angle of 4-6 ° (equal to the friction angle of the material for spontaneous removal (the so-called unscrewing) of the lining fight.

Increasing the upper limit of the speed of movement of the working body has a positive effect on performance, and lowering the lower limit of speed affects negatively the performance of the dismantling of the lining. However, the upper limit of the speed of movement of the working body is limited by the technical capabilities of the working body (hydraulic hammers, pneumatic hammers), namely the frequency of impacts,

Due to the selected speed of rotation of the body, the frequency of breaking the lining and the angle of inclination of the body, the disassembly performance is ensured without jamming the lining fight in the mixer with its periodic unloading through the open ends or neck in the box placed in the niches below the zero mark.

The application of the proposed method in comparison with the known provides an increase in productivity by 1.5-2 times, reducing the duration of repairs approximately 1.4-1.6 times, reducing labor and material costs, as well as improving working conditions.

Claims (1)

Claim The method of disassembling the refractory lining of a cylindrical tank, mainly a mobile mixer, including the impact on the lining with a shock working member, rotation of the mixer body around the longitudinal axis with its simultaneous 5 1689403 6 A clone to remove a broken lining from a mixer, characterized in that, in order to increase labor productivity when disassembling the lining and reducing labor costs, a perforation width (1:40) is performed by the impacting tool in 5 upper parts of the lining of the rings along the longitudinal axis of the mixer across the lining rings (1:50) in relation to the circumference of the lining rings, sweeping it at a speed of 1.28-1.9 m / h with simultaneous transverse oscillations along the lining rings equal to 0.5-1 V / s with a frequency of 500 1000 strokes in 1 min, then rotate the mixer with speed 0,5 0.5-2 turns / min when the mixer body is tilted to the horizon at an angle of 4-6 °. 1 1689403 9 FIG. 2 FIG. 3