RU2209679C2 - Centrifugal jigging machine - Google Patents

Abstract

FIELD: concentration or ores and sands containing fine grained heavy minerals. SUBSTANCE: proposed jigging machine includes bearing frame, balance drive, two identical equal-sized jigging compartments which are located symmetrically. Each compartment has fixed body with cone-shaped jigging chamber secured on revolving shaft and overflow lip. Each compartment is provided with seal between fixed body and jigging chamber, lower floating support for shaft, diaphragm, movable cone, pulp receiver and unloading unit for the oversize and undersize. Said seal is made in form of sealing unit which includes circular water distributor, at least two cylindrical rubber-metal inserts and two circular deflectors. Water distributor secured on fixed body has hole for delivery of pressure water on one side and at least four drain ports on other side. Drain ports are smoothly distributed over perimeter of water distributor on its opposite side. Inserts are mounted between fixed body and jigging chamber. Inserts are provided with at least four longitudinal water-distributing grooves smoothly distributed over perimeter of working surface. Pressure water circular deflectors are secured on water distributor under drain ports and drain water deflectors are secured on jigging chamber. Floating support of shaft is made in form of sleeve secured on bearing frame. Bottom portion of sleeve has hole with water supply branch pipe. Arranged inside sleeve is cylindrical rubber-metal insert whose inner surface has at least four longitudinal water-distributing grooves of sinusoidal profile. Jigging machine is additionally provided with ejector secured on bearing frame. EFFECT: reduced consumption of water and power requirements without impairment of concentration parameters. 3 cl, 6 dwg

Description

 The invention relates to the field of mineral processing and can be used to enrich ores and sands containing fine-grained and heavy minerals.

 Known mass-produced and widely used both in our country and abroad jigging machines of the MOD and Labor types. The jigging machine of these types has two symmetric jigging chambers, an eccentric drive, movable cones and rubber diaphragms, with the help of which the drive creates ascending and descending water pulsations in the jigging chambers (Prospect Plant Trud, Novosibirsk, 2000).

 A common drawback of these machines: a decrease in the concentration efficiency with a decrease in particle size, especially the extraction of particles with a particle size of less than 0.25 mm is especially small. Meanwhile, in the coming years, the main source of mining, for example, gold will be alluvial deposits of hard- and medium-washed-out sand, in which the proportion of gold with a grain size of less than 0.25 mm exceeds 50%, old dumps and deposits of small-disseminated primary ores in which gold is very fine.

 Known centrifugal jigging machine Kelsey, which includes a rotating jigging chamber with perforated walls, a rotating casing of the jigging compartment, a drive system (electric motor-chain pair-shaft) of their rotation; a diaphragm, its oscillation system (camshaft-chain pair-electric motor), concentrate unloading device, light fraction and power supply (Australian patent 04269, 1986).

 Kelsey machine drawback: design complexity, see FIG. 1 and 2 of the patent, resulting in large mass, dimensions and cost. So, the last version of this machine known to us with a capacity of up to 60 t / h has a diameter of 3 m, a mass of 12 t and a cost of $ 273 thousand (Austral. Mining. - 1998, - 90, 5, - p. 53).

 The closest to the proposed invention in terms of design and physical essence of the separation process is a centrifugal jigging machine, including two enrichment chambers of a conical shape, mounted on rotating vertical shafts, movable cones, diaphragms and a two-arm balancer drive, the latter form a system for receiving in an enrichment chamber with perforated walls ascending-descending impulses of water. The rotating vertical shafts on which the jigging chambers are mounted have lower floating supports made in the form of rubber multifaceted bushes, the faces of the holes of which are curved and described by a hypocycloid, and in the gap between the rotating chamber and the stationary case of each jigging compartment, multi-start are installed spiral-shaped corrugations having a cross-section in the shape of a right-angled triangle, with a vertical face facing the axis of rotation (RF patent 2131777, 1998).

 Using the main provisions of this patent at STC GOM, it was developed, and a prototype of a depositing machine was manufactured at the Trud plant. Her tests were carried out in the industrial conditions of the Novosibirsk Tin Plant. Comparative tests with SKO-7.5 tables for processing sludge tailings showed that with a productivity of 7 SKO-7.5 tables, the extraction of tin on a jigging machine is 1.5% higher (Report "Results of the TsOM-1 test at the NOC finishing factory, Novosibirsk , 1998).

 But along with the stated positive test results of the prototype showed the disadvantages of this machine. The total water consumption due to its supply to the lower floating supports and to non-contact seals between the stationary body of the depositor compartment and the rotating depositor chamber is large. This not only increases the total consumption of water, and, consequently, of electricity, but also floodes the under-ore enrichment product and negatively affects the enrichment process. With an increase in the machine's power, the specific consumption of water, and consequently, of electric power increases, respectively, reducing technological indicators due to additional watering of the under-sieve products.

 The aim of the invention is to reduce water consumption and, consequently, the energy intensity of the process both in low power machines and (which is especially important) in medium and high power machines without deterioration of technological enrichment indicators.

 This goal is achieved by the fact that in a centrifugal depositor, including a support frame, a balancing drive, two equal-sized and symmetrically located depositors of identical design, each of which contains a fixed housing, a conical-shaped depositor chamber with perforated walls and a drain threshold, mounted on a rotating shaft sealing the gap between the fixed housing and the jigging chamber, the lower floating shaft support, the diaphragm, the movable cone, the slurry receiver and the unloading devices ny for oversize and sublattice products. The seal of the gap between the fixed housing and the jigging chamber is made in the form of a node. The gap sealing assembly comprises an annular water distributor, at least two cylindrical rubber-metal inserts and two annular reflectors. The annular water distributor is mounted on a fixed casing, has an opening for supplying pressure water on one side and at least four drain windows located evenly around the perimeter of the water distributor on its opposite side. The liners are installed between the fixed housing and the jigging chamber and are made with longitudinal water distribution grooves (at least four), evenly spaced along the perimeter of the working surface. Annular reflectors of pressure water are fixed under drain windows on the water distributor and drain water on the jigging chamber.

 The floating shaft support is made in the form of a glass mounted on a support frame. The bottom of the glass has an opening with a water supply pipe. Inside the glass there is a cylindrical rubber-metal insert, the inner surface of which has longitudinal water distribution grooves of a sinusoidal profile (at least four). The jigging machine is additionally equipped with an ejector fixed to the support frame.

 The centrifugal jigging machine differs from the prototype in that the gap seal between the fixed housing and the jigging chamber is made in the form of a node containing an annular water distributor with an opening for supplying pressure water and drain windows (at least four), at least two cylindrical rubber-metal inserts with longitudinal grooves on their working surface (at least four) and two annular reflectors (pressure and flush water). The floating shaft support is made in the form of a glass mounted on a support frame. A cylindrical rubber-metal insert with longitudinal water distribution grooves of a sinusoidal profile on its inner surface (at least four) is placed in the glass. The machine is additionally equipped with an ejector, which is mounted on a support frame.

The combination of known and new features of the claimed machine in comparison with the prototype allows, without reducing the technological performance of jigging machines of small, medium and, most importantly, high power, to reduce water and electricity consumption due to:
providing a thin-layer effect by forming a water-wetting film in small slit gaps between the working surfaces of the liner and the rotating shaft (lower floating support); liners and jigging chamber (gap seal assembly);
uniform distribution of pressure water supplied to the sealing gap;
elimination of getting from the casing compartment into the annular buffer zone of the seal assembly and into the floating support of the contaminated working pulp (pressure difference between the supplied and working water);
elimination of water and energy losses during sequential operation of jigging chambers.

 The above distinguishing features are not known and obviously do not follow from the prior art.

 In FIG. 1 is a diagram of a centrifugal jigging machine, FIG. 2 is a diagram of a lower floating shaft support, FIG. 3 is a sectional view of FIG. 2 along AA, FIG. 4 is a diagram of a gap sealing assembly between a stationary housing and a jigging chamber, FIG. . 5 is a cross section of FIG. 4 along AA, FIG. 6 is a photograph of a prototype of the inventive PTO during a test in an industrial environment.

 The inventive machine includes a support frame 1, on which two identical symmetrically located jigging compartments 2-8 are placed, each of which includes a fixed casing 2 with a flange, a jigging chamber 3 with a perforated wall and a drain threshold 4, a gap sealing unit 5 between the fixed casing 2 and jigging chamber 3, a vertical drive shaft 6 with an upper bearing support 7 and a lower floating bearing 8. The lower floating bearing 8 includes a glass 9 mounted on the frame 1 of the machine, in the bottom of which about an opening 10 with a water-supply pipe 11, a cylindrical rubber steel liner 12 with at least four longitudinal grooves water distribution sinusoidal profile 13 on its working surface. To seal the gap between the jigging chamber 3 and the stationary casing 2 of jigging compartment 2-8, a seal assembly 5 is made that includes a group of structurally and technologically related parts: an annular water distributor 14 with an opening 15 for supplying pressure water from one side and at least four drain windows 16 on the opposite side of the water distributor 14, at least two cylindrical rubber-metal liners 17 located between the fixed body 2 and the jigging chamber 3.

 The liners 17 on their working surface have at least four longitudinal water distribution grooves evenly spaced around the perimeter 18. The sealing unit of the gap 5 also includes two annular reflectors - pressure water 19, fixed under the drain windows 16 on the water distributor 14, and drain water 20, mounted on a fixed case 2. Fixed body 2, cylindrical rubber-metal liners 17, jigging chamber 3, water distributor 14 and pressure water reflector 19 form an annular buffer zone 21 with a gap gap between du camera 3 and the reflector 19. Jigging chamber 3, cylindrical rubber-metal liners 17, the stationary housing 2 and the drain water reflector 20 form a drain channel 22.

 To transmit rotational motion to jigging chambers 3, shafts 6 are connected via V-belt drive 23 to electric motors 24. In the upper part of jigging compartments 2-8, loading devices 25 are located. Fixed bodies 2 of jigging compartments 2-8 are connected through movable cones 27 to movable cones 27, which are articulated connected by a balancing frame 28, driven by a drive 29. In the lower part of the moving cones 27, discharge pipes 30 of the under-sieve product are made. On the inner surfaces of the fixed housings 2 under the drain sills 4 are fixed slurry receivers 31 for the sieve product. For hydrotransport of the undergrate jigging product, an ejector 32 is placed on the support frame 1.

 The inventive jigging machine operates as follows.

 Before starting the machine, a valve (not shown) for supplying pressure water to the lower floating support 8 and the seal assembly of the gap 5 between the jigging chamber 3 and the fixed body 2 is opened.

 The machine starts from idle start, for which they include electric motors 24, the rotation of which through the V-belt drive 23 and the shafts 6 is transmitted to the jigging chambers 3 by means of a balancing frame 28, driven by the drive 29, vertical reciprocating vibrations are transmitted to the moving cones 27. To fill the machine with water, a water supply opens through a conduit (not shown) to the fixed body 2. To form a bed, hematite grains (or a substitute for it) are loaded in the form of a pulp through a loading device 25 ) fineness slightly larger than the holes in the walls of jigging chambers 3 until the cells of the chamber are completely filled.

 The working process begins with the supply of enriched material through loading devices 25 to the depositor chambers 3. Ore particles under the action of centrifugal forces are discarded to the periphery and move upward along the surface of the artificial bed 4 to the drain thresholds 4 of the depositor chambers 3. At the same time, ore particles and bed particles experience the action of gravitational separation jigging. Heavy ore particles penetrate through the pulsating bed and the holes in the walls of jigging chamber 3 and fall into the stationary bodies 2 of jigging compartments 2-8, then into the movable cones 27 and are continuously unloaded through the unloading nozzles 30. The light fraction moves upward and through the drain thresholds of 4 jigging chambers 3 is discharged into the slurry receivers 31.

 When the PTO in the lower floating support 8, the following occurs. Water is supplied to the cup 9 of the support 8 through the nozzle 11 and the hole 10 with a pressure exceeding the working pressure of the pulp located in the fixed housing 2. Next, the water is distributed by grooves 13 over the entire contact surface of the cylindrical rubber-metal liner 12 and the rotating shaft 6. The sinusoidal profile of the grooves 13 and their location on the working surface of the liner 12 provides when the shaft 6 is rotated to provide a wedge effect in the small gap between the contact surfaces of the rotating shaft 6 and the liner 12, therefore, the wetting layer is small ty, and its consumption is small.

 During the operation of the PTO, the seal assembly of the gap 5 between the jigging chamber 3 and the stationary housing 2 of the jigging compartment 2-8 operate as follows. Water with a pressure exceeding the working pressure of the pulp located in the stationary housing 2 is fed through an opening 15 into the annular water distributor 14, from which through the drainage windows 16 it enters the annular buffer zone 21. Then, the water distribution grooves 18 in the cylindrical rubber-metal inserts 17 are distributed throughout the contact surface of the stationary liners 17 and the rotating jigging chamber 3. The design of the grooves 18, their location on the working surface of the liners 17 provide during rotation of the jigging chambers s 3 the hydrocline effect in the small gap between the contact surfaces of the rotating depositing chamber 3 and the stationary rubber-metal liners 17. Since the gap between the contact surfaces is small, the thickness of the wetting layer of water formed due to the hydrocline effect is small, therefore, the water consumption is small. Wastewater through the drain channel 22 by the reflector of the drain water 20 is sent to the slurry receiver 31 to collect the oversize product. Since the water supplied to the seal assembly of the gap 5 has a higher pressure than the pulp located in the stationary housing 2, the ingress of dirty water (pulp) from the stationary housing 2 through the slotted gap between the depositing chamber 3 and the reflector 19 is excluded, therefore, it is excluded hit of pulp particles on the contact surfaces of the jigging chamber 3 and inserts 17, which creates favorable conditions for maintaining a small size of the gap between the rubbing parts of this unit, and this ensures a longer machine operating time with low water consumption.

 So both jigging chambers work in parallel.

 The inclusion of the ejector 32 in the design of the jigging machine allows you to work in a consistent manner. Then, the initial power is supplied through the loading device 25 to only one depositing compartment 2-8. The pre-concentrated jigging product from the movable cone 27 through the discharge pipe 30 enters the ejector 32, by which the pre-concentrated product is then fed to the second jigging compartment 2-8 for additional concentration. The resulting concentrate is discharged through the discharge pipe 30 of the second jigging compartment 2-8.

 The presence of the ejector 32 allows you to work on a combined scheme of two sequentially installed jigging machines. The presence of an ejector allows the process to be carried out in a parallel manner in the first depositing machine, and in the second machine, the product obtained in the first machine is washed first in the first depositing compartment 2-8, and then the secondary control depositing takes place in the second depositing compartment 2-8.

The design of the inventive jigging machine in comparison with the prototype allows you to:
reduce energy and water consumption by reducing the leakage of working fluid in the lower floating shaft support by using cylindrical rubber-metal liners with a special arrangement of sinusoidal water distribution grooves, due to which a hydraulic wedge effect is also formed with a small gap between the working surfaces of the shaft and the liner, which ensures stable a wetting liquid layer of small thickness on the entire contact surface;
reduce energy and water consumption by reducing the leakage of the working fluid in the seal assembly of the gap between the depositor chamber and the stationary case of the depositor compartment by such a design of the components that make up the seal assembly that their combination ensures uniform distribution of pressure water supplied to the seal gap and the formation of a hydraulic wedge effect in the slot gap of small thickness, due to which the wetting layer of the liquid is small in thickness over the entire working surface of the contact, which reduces the flow of work whose liquid, and therefore, decreases the total consumption of water and energy;
the contamination of the gap of the working pulp is prevented from entering the annular buffer zone in the annular buffer zone of the seal assembly, thereby eliminating the ingress of solid abrasive particles into the seal gap, the service life of the seal assembly is increased and its duration with a small consumption of wetting water increases;
providing less water consumption makes it more possible to design a PTO of medium and even high productivity;
at a lower consumption of water in the seals due to the stabilization of the process, depositing is possible with higher separation indicators;
mobile, using an ejector, switch from parallel operation of depositing compartments to a serial or combined circuit without loss of water and energy.

 At the plant "Trud" made a prototype of the claimed TsOM. STC GOM, the Trud plant together with the Irgiredmet Institute conducted industrial tests in September-November 2000 at one of the gold mining enterprises in the Irkutsk Region. Tests have shown that, compared with the indicators obtained earlier at the NOC, in the new machine the consumption of under-water is 2.4 times lower, the total specific energy consumption is lower by 45%. During the test almost 3 thousand tons were processed. gold sands. Gold recovery increased and amounted to 85-92%. (Protocol of industrial tests of the Central Committee of Irkutsk, 2000).

Claims (3)

 1. Centrifugal jigging machine, comprising a support frame, balancing drive, two equally sized and symmetrically located jigging compartments of identical design, each of which contains a fixed housing, a conical shape jigging chamber mounted on a rotating shaft with perforated walls and a drain threshold, sealing the gap between the stationary housing and jigging chamber, lower floating shaft support, diaphragm, movable cone, slurry receiver, unloading devices for oversize and oversize products, characterized in that the gap seal is made in the form of a unit containing an annular water distributor fixed to a stationary housing with an opening for supplying pressure water on one side and with drain windows evenly spaced on the opposite side of the water distributor installed between the stationary housing and the jigging chamber less than two cylindrical rubber-metal inserts with longitudinal water distribution grooves evenly spaced along the perimeter, as well as two end reflectors - pressure water, fixed under the drain windows on the water distributor and drain water - on the jigging chamber; the floating shaft support is made in the form of a cup fixed to the support frame, the bottom of which has an opening with a water supply pipe, a cylindrical rubber-metal liner is placed in the cup, the inner surface of which has longitudinal water distribution grooves of a sinusoidal profile, and the machine is additionally equipped with an ejector mounted on the support frame.  2. Jigging machine according to claim 1, characterized in that the annular water distributor has at least four drain windows.  3. Jigging machine according to claim 1, characterized in that the cylindrical rubber-metal liners have at least four water distribution grooves.

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