RU39389U1 - CONVEYOR MACHINE FRAME - Google Patents

Abstract

The industry is ferrous metallurgy, namely: carts for sintering and roasting conveyor machines, as well as carts for the manufacture of abrasive. The essence of the utility model. The frame of the trolley includes sidewalls and longitudinal beams, consisting of at least two elements interconnected to form a gap. The gap is located between the vertical and horizontal elements, between the two parts of the horizontal element connected at the ends or on flat surfaces, between the welds connecting the elements. The width and length of the gap is limited by the ratio of the thickness of the vertical element. Elements are made of materials with different coefficients of linear expansion, as well as with different indicators of heat resistance. Effect: reducing the deflection of the carts and their warpage in the horizontal plane.

Description

The utility model relates to ferrous metallurgy and can be used in trolleys of sintering and roasting machines, as well as in the production of abrasive.

Known trolley conveyor roasting machine with a solid frame (AS USSR No. 1522014, IPC ⁴ F 27 B 21/06, publ. Bull. No. 42, 1989).

However, the solid frame has a large metal consumption and the complexity of manufacturing. In addition, due to significant thermal stresses arising during the sintering or annealing of the charge, the frame warps in the vertical and horizontal planes.

As a prototype, the trolley frame of the sinter machine was selected, consisting of side walls welded together and load-bearing beams made of horizontal and vertical elements (shelves and walls) (Ukrainian patent for utility model No. 605, IPC ⁶ F 27 B 21/04, publ. Bull. No. 5, 2000).

The disadvantage of the prototype is the deflection and warpage of the frame due to the uneven distribution of temperature along the height of the supporting beams.

The utility model is based on the task: by improving the design of the load-bearing beams, reduce the temperature of the vertical elements and its gradient along the height of the frame and thereby reduce the deflection of the trolley frame and its warpage in the horizontal plane.

The problem is solved in the frame of the conveyor machine trolley, including interconnected sidewalls and longitudinal beams, consisting of at least one upper and one lower elements, in which, according to a utility model, there is a gap between the elements in at least one beam . The gap is made in the following versions:

about between the lower vertical and upper horizontal element of the longitudinal beam;

o in the form of longitudinal slots placed between the elements, alternating with welds;

o with a width of 0.025-0.5 of the thickness of the vertical element;

about with the placement between the welds connecting the elements;

o with the length of alternating slots, which is 0.5-200 thicknesses of the vertical element;

o between at least two parts of which at least one horizontal element consists along the length;

o between at least two predominantly flat parts of which at least one horizontal element consists along the thickness; in addition, the gap may be evacuated or filled with insulating material, for example, mullite-silica wool. Simultaneously with the clearance in the beams, it is advisable to perform:

about the upper of two parts of the horizontal element: 1) from a material having a coefficient of linear expansion less than that of the material of the lower part;

2) from a more heat-resistant material than the material of a vertical element;

o monolithic horizontal element: 1) from a material having a coefficient of linear expansion less than that of the material of the vertical element; 2) from a more heat-resistant material than the material of a vertical element.

The essence of the utility model is illustrated by the attached drawings, which depict: figure 1 - General view of the frame of the trolley; figure 2 is the same in plan; figure 3 is a cross section of a longitudinal beam; 4 is a longitudinal beam, view A; 5, 6 - a longitudinal beam of two horizontal elements (two options).

The frame of the trolley (FIGS. 1, 2) is predominantly rolled and welded and consists of two sidewalls 1 and, for example, four longitudinal beams 2. If necessary, stiffeners 3 are located between the beams 2.

The longitudinal beams 2 consist of at least two elements (Fig. 3), mainly the upper horizontal 4 and the lower vertical 5. Elements 4, 5, as a rule, are interconnected and connected mainly by welding. Between the contacting connected surfaces, for example, elements 4, 5 there is a gap 6.

The main goal of the gap 6 is to reduce heat transfer from the sintering mixture to the vertical elements 5 of the frame of the trolley. The presence of a gap 6 causes heat transfer through a layer of air, which is a heat insulator in comparison with metal. During the sintering or annealing cycle of the charge, the vertical elements 5 are heated to a lower temperature, the temperature gradient along the height of the elements 5 will also decrease. As a result, the thermal stresses and deformations of the longitudinal beams will decrease, namely, their deflection and warping.

Depending on the design of the trolley and the conditions of its operation, the gap 6 is performed in different ways.

For sintering trolleys of sintering machines with a small sintering area, it is advisable to make a gap 6 in the form of a slit located along the entire length L of the connected surfaces of the supporting elements 4, 5 (Figs. 1, 3), placing it 6 between the welds 7 connecting these elements 4, 5 (figure 3).

For sintering trolleys with a larger sintering area, which are operated under more severe conditions, it is advisable to perform a gap in the form of longitudinal slots placed between the supporting elements 4, 5, alternating with welds 7 (Figs. 1, 4). It is advisable in this case, the horizontal elements are made consisting of along the length of at least two parts 8, 9 with a gap 10 between them, which also must communicate with the gap 6 (longitudinal slit). The width t of the gap 10 should be sufficient to compensate for the thermal expansion of parts 8, 9 (to eliminate the likelihood of warping parts 8, 9). On the other hand, the width t cannot be too large to prevent the mixture from spilling into the gap 10. With this in mind, the optimal width t of the gap 10 is 3-8 mm.

This design ensures the absence of warping of both vertical and horizontal elements 4, 5.

For bogies of roasting machines that operate under more severe conditions, it is advisable to make the horizontal supporting element composite, for example, from two flat parts 11, 12 (Fig. 5), located one on top of the other with a gap 13 between the flat surfaces, and these parts 11, 12 to connect with welds 14. This design of the longitudinal beam 2 reduces heat transfer both at the border of the elements 5 and 12, and due to the gap 13 between the parts 11, 12 of the horizontal supporting element. The heat transfer rate will be reduced even more if:

about in the gap 13 will be placed insulating material, for example, mullitokremnezemnaya cotton wool, asbestos, etc .;

about parts 11, 12, connect along the circuit by electron beam welding and due to this process, evacuate the gap 13.

Another design option of the horizontal element involves the implementation of its upper part 11 in the form of a gutter (Fig.6). In the gutter is the lower part 12 of the horizontal element. A gap 13 is made between the bottom of the gutter and the upper surface of the lower part 12. Parts 11, 12 are either welded along the length of the beam (i.e., the side walls of the gutter are welded to the side portions of the lower part 12), or are only welded to the sidewalls 1.

In order to reduce the likelihood of warping of the upper elements of the beam in the presence of a gap, it is advisable to perform them from a material whose linear expansion coefficient is less than that of the material of the lower elements. It refers to:

about part 11 relative to part 12 (figure 5, 6);

about element 4 relative to element 5 (figure 3);

about part 11 with respect to part 12, and part 12 with respect to element 5 (FIGS. 5, 6).

With this choice of materials, the warmer upper elements and parts change their sizes in the same proportion as the less heated lower parts and elements. In this regard, the deflection and warping of the trolley are also reduced.

Given the higher heating temperature of the upper parts and elements of the beams, it is advisable to perform them from a more heat-resistant material than the material of the lower parts and elements of the beams. Refers to:

about part 11 relative to part 12 (figure 5, 6);

about element 4 relative to element 5 (figure 3);

about part 11 relative to part 12, and part 12 relative to element 5 (Fig.6).

Such a choice of materials for the manufacture of beams provides equal strength beams, which also reduces the likelihood of warpage of the trolley.

For rolling-welded version of the frame, it is advisable to set the width t and the length B of the gaps b, 13 to establish from the ratios:

m = (0.025-0.5) s,

B = (0.5-200) s;

where s is the thickness of the vertical bearing element.

Width m <0.025s is impractical, since it practically does not affect the reduction of heat transfer. For m> 0.025s, the required quality of joining elements 4, 5 and 11.12 with welds 7 and 14 is not ensured. If B <0.5s, there is no decrease in heat transfer intensity, and equality B = 200s is an option for performing gap 6 along the entire element lengths 4, 5 for a frame of maximum length L.

The table shows examples of the performance of gaps in sintering and roasting machines. Rolled-welded frames of these trolleys were created from two sidewalls and four longitudinal beams with stiffeners placed between them. Beams consisted of two elements: one vertical supporting wall and one horizontal shelf. The shelf was made in the form of either one piece of strip rolled products, or two parts welded with flat surfaces along a contour with each other with the formation of a gap.

The effect of the presence of gaps was evaluated by a decrease in temperature, which was measured near the upper and lower ends of the vertical bearing walls.

In comparison with the temperature distribution recorded for the longitudinal beams of the prototype trolley, the design of the proposed frame provides a reduction in:

about the temperature near the upper end of the vertical wall in the range of 20-110 °;

o temperature gradient between the upper and lower ends of the vertical walls within 10-80 °.

The best results were achieved according to option 7, the minimum positive temperature effect was recorded in the manufacture of a longitudinal beam according to option 5.

Table
Manufacturing options for a longitudinal beam with gaps No. p Clearance location Thickness of the longitudinal beam L, mm The thickness of the vertical wall, s, mm The width of the gap, t, mm m / s The length of the gap, in mm B / s 1. between horizontal and vertical elements 2730 20 8 0.4 fifty 2,5 2 between horizontal and vertical elements along their entire length 2730 20 4 0.2 2730 136.5 3. between horizontal and vertical elements along their entire length 5000 25 9 0.36 5000 200 4. between horizontal and vertical elements along their entire length 2500 thirty fifteen 0.5 2500 83.3 5. between horizontal and vertical elements along their entire length 2500 40 1 0,025 2500 83.3 6. between horizontal and vertical elements 2730 20 4 0.2 10 0.5 7. between horizontal and vertical elements and between two parts of the burn 2730 20 8 0.4 fifty 2,5 umbrella shelf 90 (equal to the width of the horizontal shelf) 2730

Claims (17)

1. The frame of the conveyor machine trolley, comprising interconnected sidewalls and longitudinal beams, consisting of at least one upper and one lower element, characterized in that there is a gap between the elements in at least one beam. 2. The frame according to claim 1, characterized in that the elements are interconnected by welds. 3. The frame according to claim 1, characterized in that the gap is made between the lower vertical and upper horizontal element. 4. The frame according to claim 1, characterized in that the gap is made along the entire length of the surfaces of the elements closest to each other. 5. The frame according to claim 2, characterized in that the gap is made in the form of longitudinal slots placed between the elements, alternating with welds. 6. The frame according to claim 3, characterized in that the gap width is 0.025-0.5 of the thickness of the vertical element. 7. The frame according to PP.2 and 4, characterized in that the gap is located between the welds. 8. The frame according to claims 3 and 5, characterized in that the length of the slots is 0.5-200 thicknesses of the vertical element. 9. The frame according to PP.3 and 5, characterized in that at least one horizontal element consists along the length of at least two parts located opposite each other with a gap between the end surfaces communicating with the longitudinal slit. 10. The frame according to claim 3, characterized in that at least one upper horizontal element consists along the thickness of at least two mainly flat parts located with flat surfaces one opposite the other with a gap between them. 11. The frame of claim 10, characterized in that a heat-insulating material, for example, mullite-silica wool, is placed in the gap. 12. The frame of claim 10, wherein the gap is evacuated. 13. The frame of claim 10, wherein the upper part is made of a material whose linear expansion coefficient is less than that of the material of the lower part. 14. The frame of claim 10, wherein the upper part is made of a more heat-resistant material than the lower part. 15. The frame according to claim 3, characterized in that the horizontal element is made of a material whose linear expansion coefficient is less than that of the material of the vertical element. 16. The frame according to claim 3, characterized in that the horizontal element is made of a more heat-resistant material than the vertical element. 17. The frame according to claim 3, characterized in that at least one horizontal element consists along the thickness of at least two parts, the upper of which is made in the form of a gutter, and the lower part is located in the gutter, while between it the top surface and the bottom surface of the gutter made a gap.