RU2221114C1 - Suction-tube dredger clean-up suction device - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: invention relates to hydraulic mechanization facilities and it can be used at mining placers of any density in underwater mines. Proposed clean-up suction device of suction- tube dredger includes suction nose with flat ring screen and vertical bead over periphery, skirt connected by cover plates and bolts with vertical bead and forming vertical slots. Skirt is made of elastic reinforced wear-resistant material. Invention can be used for clean up works on firms having surface irregularities in form of cracks, narrow slit like falls and extraction of mineral components from inter-step and inter-run pillars at primary dredge mining of placer. EFFECT: improved efficiency of extraction of mineral components from placer. 2 dwg

Description

The invention relates to the field of hydromechanization and can be used in the development of alluvial mineral deposits in underwater faces.

A suction device for a dredger is known, including a suction tip with an annular screen containing a disk located at the level of the mouth and radial grooves; the annular screen is provided with a shoulder installed below the outer part of the disk, and the radial grooves are formed by sectors with stiffeners associated with the disk and the shoulder, while the disk is made rigid [1].

A suction device for a dredger is known, including a suction tip with an annular screen, wherein the annular screen is made rigid, hollow and slotted with a solid hard disk located at the level of the input section of the suction tip and a lower fixed disk with vertical and horizontal shoulders, while the annular screen is equipped with a movable disk mounted on a lower fixed disk with the possibility of rotation relative to it [2].

These devices, having indisputable advantages over previously used structures, turn out to be ineffective under the conditions of an uneven surface of the placer and, especially, when there are roughnesses in the form of cracks, narrow slit-like depressions and other violations of the profile of the placer. In addition, if dragee mining technology is used for placer mining, the loss of a valuable component is often concentrated in inter-step and cross-pass pillars and can be caused by the spilling of sand from scoops [3].

The closest in technical essence to the proposed is the suction device of the dredger, including a suction tip with an annular screen made flat and rigid with a stabilization section, equipped with a rounded element mounted on the outer edge of the annular screen, while the stabilization section and the vertical part of the annular screen are mated in the form of a curved surface [4].

An object of the invention is to increase the efficiency of extracting useful components of the placer during the cleaning of the placer raft in the presence of irregularities in the form of cracks, narrow slit-like depressions, as well as the extraction of losses of primary dragee technology for the development of the placer from interstep and inter-pass pillars.

This goal is achieved by the fact that in the sweep suction device of the dredger, including the suction tip with a flat annular screen, the annular screen is made with a vertical collar on the periphery to which the skirt is made of elastic reinforced elastic and wear-resistant material, providing sufficient localization of the under-screen space, with vertical slots for leakage of water into the sub-screen space in radial directions to prevent cavitation in the suction line of the dredger.

The total area of vertical slots in the skirt should be sufficient to allow water to pass at a flow rate approximately equal to the dredger pump’s throughput rate in water to avoid possible cavitation and a sharp decrease in plant performance up to a complete failure in the suction line of the dredger.

The implementation of the screen with a skirt provides sufficient localization of the sub-screen space in the presence of irregularities in the face and increases the efficiency of extraction of useful components of the placer during cleaning operations.

The proposed device for cleaning the suction device of the dredger with a screen and a skirt is shown in the drawings.

Figure 1 - view of the cleaning suction device of the dredger; Fig. 2 is a view A of Fig. 1.

The cleaning suction device of the dredger contains a suction tip 1, a flat annular screen 2, having a vertical collar 3 around the periphery, to which a skirt 6 of elastic reinforced elastic and wear-resistant material is formed by means of metal overlays 4 and bolts 5, forming vertical slots 7.

The device operates as follows.

When the suction tip 1 with a flat annular screen 2 with a vertical collar 3 is lowered into the water, to which the skirt 6 is fastened with metal bolts 4 with bolts 5, and the latter is brought to the surface of the placer or raft, the sub-screen space is localized even if there are irregularities on the surface or raft. After the suction pump is turned on (not shown in the drawing), a vacuum develops in the sub-screen space, under the action of which ascending currents of water are formed, which carry away both particles of the host rock and useful components, not only located on the surface of the placer, but also in local depths and roughnesses of the raft. At the same time, under the influence of vacuum, radial directions from the surrounding space through vertical slots 7 in the skirt 6 bring water that replaces the suction water, which prevents the development of cavitation in the subscreen space and the suction tip 1 and ensures stable operation of the dredger.

The use of a stripping suction device will ensure the completeness of the extraction of valuable components from the raft of the field, which helps to increase the efficiency of mining the field as a whole.

Sources of information

1. RF patent No. 2148692, 7 E 02 F 3/92, “The suction device of the dredger”, publ. 05/10/2000, Bull. Number 13.

2. RF patent No. 2162124, 7 E 02 F 3/92, “Suction device of a dredger”, publ. 01/20/2001, Bull. Number 2.

3. Leshkov V.G. The theory and practice of developing placers with multi-pack dredges, M .: Nedra, 1980, p. 216-217, 222-223, 226-234.

4. RF patent No. 2165499, 7 E 02 F 3/92, “Suction device of a dredger”, publ. 04/20/2001, Bull. Number 11.

Claims (1)

A suction suction device for the dredger, including a suction tip with a flat annular screen and a vertical collar at the periphery, characterized in that the device is equipped with a skirt, connected by means of metal plates with bolts with a vertical collar and forming vertical slots, while the skirt is made of elastic reinforced elastic wear-resistant material.

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