RU2441984C2 - Scroll conveyor - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: scroll conveyor designed for vertical coarse size elements transportation. Scroll conveyor consists of an outer casing with a platform, scroll spiral, loading and off-loading window, off-loading chute and reduction gear. The casing is equipped with an inner linear groove located parallel to the axis along the casing. Inside the casing splined bushings with hollow axis and splined bushings anti-rotation device is situated on the stationary shaft. Bearing bushings of helice severity are located in the casing. Reduction gear is situated in the upper, lower or middle part of the casing.

EFFECT: enhancement of the coefficient of uprise of transported masses efficiency, as well as reduction in the quantity of the equipment items involved, elimination of breaking zones at the centerline and in the corners of the spiral-shaft.

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Description

A screw conveyor is a device designed for development and use in mining, metallurgy and construction for the design and manufacture of modular type screw conveyors, for moving large-sized product to any predetermined height while increasing productivity in a minimum space, at a minimum cost, and a minimum amount of equipment . The use of this device will help to significantly reduce the cost of lifting the rock to the desired height.

Currently, many varieties of screw conveyors are produced, but what the market offers is intended only for bulk products with a maximum capacity of 1.4 tons / hour. For vertical augers, patent RU 2264969 and others, with a final nozzle with two spirals in the auger loading area and also only for bulk products, USSR copyright certificate No. 724715 - a vertical auger conveyor with a screw with a central shaft and longitudinal corrugations on the inner and outer surfaces housing-casing in the device for rotary drilling of holes.

The closest analogue in design is A.S. USSR No. 724715, but for the effective movement of material by a vertical screw conveyor, it is necessary to remove the material from the loading zone as quickly as possible. Otherwise, the first turns of the screw are filled with material, then the material is densified in the inter-turn space, especially in the contiguity zone - welding the spiral to the screw shaft - a dead zone and quite extensive, and as a result, the screw stops, especially at a considerable height. The present invention is directed to the creation of a compact, mobile device of a modular type for transporting coarse breed.

The technical result consists in increasing the efficiency of lifting the transported mass due to the absence of dead zones at the working spiral, i.e. the absence of a spiral shaft, which is the basis of auger rigidity, helps to eliminate braking and sticking zones to the axis and in the corners of the spiral — the shaft that impedes the advancement of the entire volume of rock in the coil-turn space along the spiral pitch, which reduces the working area of the rock sliding along the spiral due to sticking - rock compaction in the dead zones of the auger, dramatically reducing efficiency. Cheaper the process of lifting the destroyed rock by reducing the installation area of the conveyor, reducing the number of occupied equipment (complex heavy truck fleet, its maintenance), because in terms of productivity, screw conveyors will compete with trucking in overburden and mining processes.

The specified technical result is achieved by the fact that in the screw conveyor device, which includes a housing 11 with internal slots 5, loading windows 13, a working spiral 9, welded (12) to the inner surface of the spiral drive gear in the gearbox 7 and rotating in the inner space of the housing 11 between the fixed internal spline surface of the housing 11 with splines 5 and the fixed spline surface of the spline nozzles 1 with splines 2.

Since the required length of the conveyor can fluctuate with significant values of 5-10-15 m with a diameter of up to one meter, and not 80 mm with a rotation of 224 rpm and a length of 1.5-2 m in RU 2264969 (by the way, auger loading and loading a cement, inert dust conveyor used in gas and dust explosive mines is driven by a shaft manual electric motor for drilling holes with a rotation of 270 rpm), the considered system will not work - other drastic measures are required.

Consider a concrete example

It is required to move the coarse rock during mechanized penetration of the trunk to obtain the main product fraction of 50-150 mm to a height of 10 m (three-tier tunneling barrel shelves) for loading into the hopper of the upper tier. Permissible product mass in the screw with an inner diameter of the case equal to 1 m and an outer diameter of spline nozzles of 300 mm at beats. weight of 3 g / cm ³ will be equal to 21 t / this is a significant value /.

Therefore, to compensate for the compression and tensile forces of the loaded spiral, because only it is a working body and must withstand such loads, we must take certain measures. First, we divide the load in half, i.e. install gear 7 in the middle of the conveyor. Secondly, we divide the half-load in half, i.e. at half the distance between the base 15 and the gear 7 installed in the middle of the conveyor, Figure 2, we will install the stiffness sleeve of the spiral 3 and fix it by welding 12, Figure 1, in the upper half between the gear 7 and the loading window 6 we will also install stiffness sleeves, which will be take on the efforts of compression and tension of the spiral, in which case the fixed spline nozzle will be solid from the base to the upper end of the conveyor.

Thirdly, for stabilization and reliable operation of the spiral, we install an angular contact bearing at the base of the screw on the end of the spiral and an angular contact bearing on the top cover of the conveyor.

In reality, the conveyor can be filled up to 2/3 of its volume and the distribution over the turns of the spiral 9 with uniform continuous loading is uniform, that’s why, by dividing the total load and transferring it to the stiffness sleeves 3, we can significantly reduce the thickness of the spiral 9 and if we install stiffness sleeves 3 on a hollow fixed axis - the basis of the assembly of splined nozzles, which is why I laid splined nozzles to solve technological issues of assembly of the conveyor and when installing stiffness bushings 3 along the inner diameter of the spiral, I need Xia oil tank 17 and the oil passages 18 within the stationary hollow axle for lubricating stiffening sleeves on a fixed axis.

Figure 1 shows a screw conveyor with a gear arrangement at the top of the conveyor and in the middle of figure 2 (preferably with a significant length of the conveyor).

The design of the bearings 14, nozzles 1, the hollow axis 10 with or without spline sleeve 4 may be different. Similarly, the housing 11 may be a solid pipe or a composite of two, cut along the axis of the halves with a special mount or clamps. The material arriving for loading is passed through a vibrating screen to separate large pieces. Example: the outer diameter of the casing is 11-1000 mm, the inner diameter of the spiral is 9 - 300 mm, the pitch of the spiral is 400 mm.

In case of accidental simultaneous entry into the loading window of 13 2-3 pieces of 200-300 mm, they can wedge between two turns of the spiral or between the outer casing 11 and the spline nozzles 1.

Therefore, the lumpy material is separated, fed to the crusher and returned to loading. The spiral 9, rotated by the gearbox 7, picks up the rock, moistened with water for better gliding (preferably), moves the rock up between the walls of the housing 11 with splines 5 and nozzles 1 with splines 2, the splines prevent the rock from rotating together with the spiral, helping to move the rock up due to rock sliding along the plane of the spiral 9. The rock advances to the discharge windows 6 and falls into estrus 8. The structural performance of the conveyor is governed by the specific gravity of the rock, the diameter of the casing, the width of the spiral tape, the pitch of the spiral and Islom RPM preferably from 20 to 60 rev / min. The stability of the work and the size of the fraction depend on the pitch, width and thickness of the spiral. Reliability (motor resources) depends on the selection of the material of the body, spiral, attrition nozzle. Oil pipelines 18 are located along the internal space 16 of the fixed axis 10 for lubricating the stiffness bushings 3 from the oil station 17 located at the top or bottom of the conveyor.

Figure 1-2 indicated:

1. A splined nozzle on an axis.

2. Slots of the splined nozzle.

3. Spiral stiffness sleeve.

4. Splined connecting sleeve of the axis and nozzles.

5. Slots of the outer casing.

6. Unloading windows.

7. The gearbox.

8. The unloading chute.

9. The spiral.

10. Fixed axis.

11. Case.

12. Welding.

13. Boot windows.

14. The bearing.

15. The basis.

16. The inner space of the fixed axis.

17. Maslostantion.

18. Oil pipelines.

19. The top cover of the housing.

Claims (1)

The device is a screw conveyor designed for transportation of destroyed lumpy rock - crushed stone, gravel, destroyed rock by mechanized or blasting and drilling - by blasting in ways that increase the efficiency of lifting the transported mass, reduce the working area, reduce the number of occupied equipment by eliminating braking zones - sticking to the axis and in the corners a spiral is a shaft that includes an outer casing with a base, a screw spiral, loading, unloading windows, unloading estrus, a gearbox, distinguishing by equipping the casing with internal longitudinal slots parallel to the axis along the entire length of the casing, spline nozzles are assembled inside the casing on the fixed axis to prevent rotation of the hollow axis and spline nozzles, by the presence of spiral stiffness bearing bushings located inside the casing to compensate the forces of the loaded spiral from compression and / or tension , the presence of a drive gear located at the top, bottom or in the middle of the housing - preferably with a significant length of the conveyor.

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